stream_decoder.c

/* libFLAC - Free Lossless Audio Codec library * Copyright (C) 2000-2009 Josh Coalson * Copyright (C) 2011-2016 Xiph.Org Foundation * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of the Xiph.org Foundation nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifdef HAVE_CONFIG_H # include <config.h> #endif #include <stdio.h> #include <stdlib.h> /* for malloc() */ #include <string.h> /* for memset/memcpy() */ #include <sys/stat.h> /* for stat() */ #include <sys/types.h> /* for off_t */ #include "share/compat.h" #include "FLAC/assert.h" #include "share/alloc.h" #include "protected/stream_decoder.h" #include "private/bitreader.h" #include "private/bitmath.h" #include "private/cpu.h" #include "private/crc.h" #include "private/fixed.h" #include "private/format.h" #include "private/lpc.h" #include "private/md5.h" #include "private/memory.h" #include "private/macros.h" /* technically this should be in an "export.c" but this is convenient enough */ FLAC_API int FLAC_API_SUPPORTS_OGG_FLAC = FLAC__HAS_OGG; /*********************************************************************** * * Private static data * ***********************************************************************/ static const FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' }; /*********************************************************************** * * Private class method prototypes * ***********************************************************************/ static void set_defaults_(FLAC__StreamDecoder *decoder); static FILE *get_binary_stdin_(void); static FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, uint32_t size, uint32_t channels); static FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id); static FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder); static FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder); static FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length); static FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length); static FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj, uint32_t length); static FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj); static FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj); static FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder); static FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder); static FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode); static FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder); static FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode); static FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode); static FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode); static FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode); static FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode); static FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, uint32_t predictor_order, uint32_t partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended); static FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder); static FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data); #if FLAC__HAS_OGG static FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes); static FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data); #endif static FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[]); static void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status); static FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample); #if FLAC__HAS_OGG static FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample); #endif static FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data); static FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data); static FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data); static FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data); static FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data); /*********************************************************************** * * Private class data * ***********************************************************************/ typedef struct FLAC__StreamDecoderPrivate { FLAC__bool is_ogg; FLAC__StreamDecoderReadCallback read_callback; FLAC__StreamDecoderSeekCallback seek_callback; FLAC__StreamDecoderTellCallback tell_callback; FLAC__StreamDecoderLengthCallback length_callback; FLAC__StreamDecoderEofCallback eof_callback; FLAC__StreamDecoderWriteCallback write_callback; FLAC__StreamDecoderMetadataCallback metadata_callback; FLAC__StreamDecoderErrorCallback error_callback; /* generic 32-bit datapath: */ void (*local_lpc_restore_signal)(const FLAC__int32 residual[], uint32_t data_len, const FLAC__int32 qlp_coeff[], uint32_t order, int lp_quantization, FLAC__int32 data[]); /* generic 64-bit datapath: */ void (*local_lpc_restore_signal_64bit)(const FLAC__int32 residual[], uint32_t data_len, const FLAC__int32 qlp_coeff[], uint32_t order, int lp_quantization, FLAC__int32 data[]); /* for use when the signal is <= 16 bits-per-sample, or <= 15 bits-per-sample on a side channel (which requires 1 extra bit): */ void (*local_lpc_restore_signal_16bit)(const FLAC__int32 residual[], uint32_t data_len, const FLAC__int32 qlp_coeff[], uint32_t order, int lp_quantization, FLAC__int32 data[]); void *client_data; FILE *file; /* only used if FLAC__stream_decoder_init_file()/FLAC__stream_decoder_init_file() called, else NULL */ FLAC__BitReader *input; FLAC__int32 *output[FLAC__MAX_CHANNELS]; FLAC__int32 *residual[FLAC__MAX_CHANNELS]; /* WATCHOUT: these are the aligned pointers; the real pointers that should be free()'d are residual_unaligned[] below */ FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents[FLAC__MAX_CHANNELS]; uint32_t output_capacity, output_channels; FLAC__uint32 fixed_block_size, next_fixed_block_size; FLAC__uint64 samples_decoded; FLAC__bool has_stream_info, has_seek_table; FLAC__StreamMetadata stream_info; FLAC__StreamMetadata seek_table; FLAC__bool metadata_filter[128]; /* MAGIC number 128 == total number of metadata block types == 1 << 7 */ FLAC__byte *metadata_filter_ids; size_t metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */ FLAC__Frame frame; FLAC__bool cached; /* true if there is a byte in lookahead */ FLAC__CPUInfo cpuinfo; FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */ FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */ /* unaligned (original) pointers to allocated data */ FLAC__int32 *residual_unaligned[FLAC__MAX_CHANNELS]; FLAC__bool do_md5_checking; /* initially gets protected_->md5_checking but is turned off after a seek or if the metadata has a zero MD5 */ FLAC__bool internal_reset_hack; /* used only during init() so we can call reset to set up the decoder without rewinding the input */ FLAC__bool is_seeking; FLAC__MD5Context md5context; FLAC__byte computed_md5sum[16]; /* this is the sum we computed from the decoded data */ /* (the rest of these are only used for seeking) */ FLAC__Frame last_frame; /* holds the info of the last frame we seeked to */ FLAC__uint64 first_frame_offset; /* hint to the seek routine of where in the stream the first audio frame starts */ FLAC__uint64 target_sample; uint32_t unparseable_frame_count; /* used to tell whether we're decoding a future version of FLAC or just got a bad sync */ FLAC__bool got_a_frame; /* hack needed in Ogg FLAC seek routine to check when process_single() actually writes a frame */ } FLAC__StreamDecoderPrivate; /*********************************************************************** * * Public static class data * ***********************************************************************/ FLAC_API const char * const FLAC__StreamDecoderStateString[] = { "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA", "FLAC__STREAM_DECODER_READ_METADATA", "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC", "FLAC__STREAM_DECODER_READ_FRAME", "FLAC__STREAM_DECODER_END_OF_STREAM", "FLAC__STREAM_DECODER_OGG_ERROR", "FLAC__STREAM_DECODER_SEEK_ERROR", "FLAC__STREAM_DECODER_ABORTED", "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR", "FLAC__STREAM_DECODER_UNINITIALIZED" }; FLAC_API const char * const FLAC__StreamDecoderInitStatusString[] = { "FLAC__STREAM_DECODER_INIT_STATUS_OK", "FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER", "FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS", "FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR", "FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE", "FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED" }; FLAC_API const char * const FLAC__StreamDecoderReadStatusString[] = { "FLAC__STREAM_DECODER_READ_STATUS_CONTINUE", "FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM", "FLAC__STREAM_DECODER_READ_STATUS_ABORT" }; FLAC_API const char * const FLAC__StreamDecoderSeekStatusString[] = { "FLAC__STREAM_DECODER_SEEK_STATUS_OK", "FLAC__STREAM_DECODER_SEEK_STATUS_ERROR", "FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED" }; FLAC_API const char * const FLAC__StreamDecoderTellStatusString[] = { "FLAC__STREAM_DECODER_TELL_STATUS_OK", "FLAC__STREAM_DECODER_TELL_STATUS_ERROR", "FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED" }; FLAC_API const char * const FLAC__StreamDecoderLengthStatusString[] = { "FLAC__STREAM_DECODER_LENGTH_STATUS_OK", "FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR", "FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED" }; FLAC_API const char * const FLAC__StreamDecoderWriteStatusString[] = { "FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE", "FLAC__STREAM_DECODER_WRITE_STATUS_ABORT" }; FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[] = { "FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC", "FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER", "FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH", "FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM" }; /*********************************************************************** * * Class constructor/destructor * ***********************************************************************/ FLAC_API FLAC__StreamDecoder *FLAC__stream_decoder_new(void) { FLAC__StreamDecoder *decoder; uint32_t i; FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */ decoder = calloc(1, sizeof(FLAC__StreamDecoder)); if(decoder == 0) { return 0; } decoder->protected_ = calloc(1, sizeof(FLAC__StreamDecoderProtected)); if(decoder->protected_ == 0) { free(decoder); return 0; } decoder->private_ = calloc(1, sizeof(FLAC__StreamDecoderPrivate)); if(decoder->private_ == 0) { free(decoder->protected_); free(decoder); return 0; } decoder->private_->input = FLAC__bitreader_new(); if(decoder->private_->input == 0) { free(decoder->private_); free(decoder->protected_); free(decoder); return 0; } decoder->private_->metadata_filter_ids_capacity = 16; if(0 == (decoder->private_->metadata_filter_ids = malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) { FLAC__bitreader_delete(decoder->private_->input); free(decoder->private_); free(decoder->protected_); free(decoder); return 0; } for(i = 0; i < FLAC__MAX_CHANNELS; i++) { decoder->private_->output[i] = 0; decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0; } decoder->private_->output_capacity = 0; decoder->private_->output_channels = 0; decoder->private_->has_seek_table = false; for(i = 0; i < FLAC__MAX_CHANNELS; i++) FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&decoder->private_->partitioned_rice_contents[i]); decoder->private_->file = 0; set_defaults_(decoder); decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED; return decoder; } FLAC_API void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder) { uint32_t i; if (decoder == NULL) return ; FLAC__ASSERT(0 != decoder->protected_); FLAC__ASSERT(0 != decoder->private_); FLAC__ASSERT(0 != decoder->private_->input); (void)FLAC__stream_decoder_finish(decoder); if(0 != decoder->private_->metadata_filter_ids) free(decoder->private_->metadata_filter_ids); FLAC__bitreader_delete(decoder->private_->input); for(i = 0; i < FLAC__MAX_CHANNELS; i++) FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&decoder->private_->partitioned_rice_contents[i]); free(decoder->private_); free(decoder->protected_); free(decoder); } /*********************************************************************** * * Public class methods * ***********************************************************************/ static FLAC__StreamDecoderInitStatus init_stream_internal_( FLAC__StreamDecoder *decoder, FLAC__StreamDecoderReadCallback read_callback, FLAC__StreamDecoderSeekCallback seek_callback, FLAC__StreamDecoderTellCallback tell_callback, FLAC__StreamDecoderLengthCallback length_callback, FLAC__StreamDecoderEofCallback eof_callback, FLAC__StreamDecoderWriteCallback write_callback, FLAC__StreamDecoderMetadataCallback metadata_callback, FLAC__StreamDecoderErrorCallback error_callback, void *client_data, FLAC__bool is_ogg ) { FLAC__ASSERT(0 != decoder); if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) return FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED; if(FLAC__HAS_OGG == 0 && is_ogg) return FLAC__STREAM_DECODER_INIT_STATUS_UNSUPPORTED_CONTAINER; if( 0 == read_callback || 0 == write_callback || 0 == error_callback || (seek_callback && (0 == tell_callback || 0 == length_callback || 0 == eof_callback)) ) return FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS; #if FLAC__HAS_OGG decoder->private_->is_ogg = is_ogg; if(is_ogg && !FLAC__ogg_decoder_aspect_init(&decoder->protected_->ogg_decoder_aspect)) return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE; #endif /* * get the CPU info and set the function pointers */ FLAC__cpu_info(&decoder->private_->cpuinfo); /* first default to the non-asm routines */ decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal; decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide; decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal; /* now override with asm where appropriate */ #ifndef FLAC__NO_ASM if(decoder->private_->cpuinfo.use_asm) { #ifdef FLAC__CPU_IA32 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32); #ifdef FLAC__HAS_NASM decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide_asm_ia32; /* OPT_IA32: was really necessary for GCC < 4.9 */ if (decoder->private_->cpuinfo.x86.mmx) { decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32; decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx; } else { decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32; decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32; } #endif #if FLAC__HAS_X86INTRIN && ! defined FLAC__INTEGER_ONLY_LIBRARY # if defined FLAC__SSE4_1_SUPPORTED if (decoder->private_->cpuinfo.x86.sse41) { # if !defined FLAC__HAS_NASM /* these are not undoubtedly faster than their MMX ASM counterparts */ decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_intrin_sse41; decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_16_intrin_sse41; # endif decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide_intrin_sse41; } # endif #endif #elif defined FLAC__CPU_X86_64 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_X86_64); /* No useful SSE optimizations yet */ #endif } #endif /* from here on, errors are fatal */ if(!FLAC__bitreader_init(decoder->private_->input, read_callback_, decoder)) { decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR; } decoder->private_->read_callback = read_callback; decoder->private_->seek_callback = seek_callback; decoder->private_->tell_callback = tell_callback; decoder->private_->length_callback = length_callback; decoder->private_->eof_callback = eof_callback; decoder->private_->write_callback = write_callback; decoder->private_->metadata_callback = metadata_callback; decoder->private_->error_callback = error_callback; decoder->private_->client_data = client_data; decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0; decoder->private_->samples_decoded = 0; decoder->private_->has_stream_info = false; decoder->private_->cached = false; decoder->private_->do_md5_checking = decoder->protected_->md5_checking; decoder->private_->is_seeking = false; decoder->private_->internal_reset_hack = true; /* so the following reset does not try to rewind the input */ if(!FLAC__stream_decoder_reset(decoder)) { /* above call sets the state for us */ return FLAC__STREAM_DECODER_INIT_STATUS_MEMORY_ALLOCATION_ERROR; } return FLAC__STREAM_DECODER_INIT_STATUS_OK; } FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_stream( FLAC__StreamDecoder *decoder, FLAC__StreamDecoderReadCallback read_callback, FLAC__StreamDecoderSeekCallback seek_callback, FLAC__StreamDecoderTellCallback tell_callback, FLAC__StreamDecoderLengthCallback length_callback, FLAC__StreamDecoderEofCallback eof_callback, FLAC__StreamDecoderWriteCallback write_callback, FLAC__StreamDecoderMetadataCallback metadata_callback, FLAC__StreamDecoderErrorCallback error_callback, void *client_data ) { return init_stream_internal_( decoder, read_callback, seek_callback, tell_callback, length_callback, eof_callback, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false ); } FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_stream( FLAC__StreamDecoder *decoder, FLAC__StreamDecoderReadCallback read_callback, FLAC__StreamDecoderSeekCallback seek_callback, FLAC__StreamDecoderTellCallback tell_callback, FLAC__StreamDecoderLengthCallback length_callback, FLAC__StreamDecoderEofCallback eof_callback, FLAC__StreamDecoderWriteCallback write_callback, FLAC__StreamDecoderMetadataCallback metadata_callback, FLAC__StreamDecoderErrorCallback error_callback, void *client_data ) { return init_stream_internal_( decoder, read_callback, seek_callback, tell_callback, length_callback, eof_callback, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true ); } static FLAC__StreamDecoderInitStatus init_FILE_internal_( FLAC__StreamDecoder *decoder, FILE *file, FLAC__StreamDecoderWriteCallback write_callback, FLAC__StreamDecoderMetadataCallback metadata_callback, FLAC__StreamDecoderErrorCallback error_callback, void *client_data, FLAC__bool is_ogg ) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != file); if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED; if(0 == write_callback || 0 == error_callback) return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS; /* * To make sure that our file does not go unclosed after an error, we * must assign the FILE pointer before any further error can occur in * this routine. */ if(file == stdin) file = get_binary_stdin_(); /* just to be safe */ decoder->private_->file = file; return init_stream_internal_( decoder, file_read_callback_, decoder->private_->file == stdin? 0: file_seek_callback_, decoder->private_->file == stdin? 0: file_tell_callback_, decoder->private_->file == stdin? 0: file_length_callback_, file_eof_callback_, write_callback, metadata_callback, error_callback, client_data, is_ogg ); } FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_FILE( FLAC__StreamDecoder *decoder, FILE *file, FLAC__StreamDecoderWriteCallback write_callback, FLAC__StreamDecoderMetadataCallback metadata_callback, FLAC__StreamDecoderErrorCallback error_callback, void *client_data ) { return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false); } FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_FILE( FLAC__StreamDecoder *decoder, FILE *file, FLAC__StreamDecoderWriteCallback write_callback, FLAC__StreamDecoderMetadataCallback metadata_callback, FLAC__StreamDecoderErrorCallback error_callback, void *client_data ) { return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true); } static FLAC__StreamDecoderInitStatus init_file_internal_( FLAC__StreamDecoder *decoder, const char *filename, FLAC__StreamDecoderWriteCallback write_callback, FLAC__StreamDecoderMetadataCallback metadata_callback, FLAC__StreamDecoderErrorCallback error_callback, void *client_data, FLAC__bool is_ogg ) { FILE *file; FLAC__ASSERT(0 != decoder); /* * To make sure that our file does not go unclosed after an error, we * have to do the same entrance checks here that are later performed * in FLAC__stream_decoder_init_FILE() before the FILE* is assigned. */ if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED; if(0 == write_callback || 0 == error_callback) return decoder->protected_->initstate = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS; file = filename? flac_fopen(filename, "rb") : stdin; if(0 == file) return FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE; return init_FILE_internal_(decoder, file, write_callback, metadata_callback, error_callback, client_data, is_ogg); } FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_file( FLAC__StreamDecoder *decoder, const char *filename, FLAC__StreamDecoderWriteCallback write_callback, FLAC__StreamDecoderMetadataCallback metadata_callback, FLAC__StreamDecoderErrorCallback error_callback, void *client_data ) { return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/false); } FLAC_API FLAC__StreamDecoderInitStatus FLAC__stream_decoder_init_ogg_file( FLAC__StreamDecoder *decoder, const char *filename, FLAC__StreamDecoderWriteCallback write_callback, FLAC__StreamDecoderMetadataCallback metadata_callback, FLAC__StreamDecoderErrorCallback error_callback, void *client_data ) { return init_file_internal_(decoder, filename, write_callback, metadata_callback, error_callback, client_data, /*is_ogg=*/true); } FLAC_API FLAC__bool FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder) { FLAC__bool md5_failed = false; uint32_t i; FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->private_); FLAC__ASSERT(0 != decoder->protected_); if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED) return true; /* see the comment in FLAC__stream_decoder_reset() as to why we * always call FLAC__MD5Final() */ FLAC__MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context); free(decoder->private_->seek_table.data.seek_table.points); decoder->private_->seek_table.data.seek_table.points = 0; decoder->private_->has_seek_table = false; FLAC__bitreader_free(decoder->private_->input); for(i = 0; i < FLAC__MAX_CHANNELS; i++) { /* WATCHOUT: * FLAC__lpc_restore_signal_asm_ia32_mmx() and ..._intrin_sseN() * require that the output arrays have a buffer of up to 3 zeroes * in front (at negative indices) for alignment purposes; * we use 4 to keep the data well-aligned. */ if(0 != decoder->private_->output[i]) { free(decoder->private_->output[i]-4); decoder->private_->output[i] = 0; } if(0 != decoder->private_->residual_unaligned[i]) { free(decoder->private_->residual_unaligned[i]); decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0; } } decoder->private_->output_capacity = 0; decoder->private_->output_channels = 0; #if FLAC__HAS_OGG if(decoder->private_->is_ogg) FLAC__ogg_decoder_aspect_finish(&decoder->protected_->ogg_decoder_aspect); #endif if(0 != decoder->private_->file) { if(decoder->private_->file != stdin) fclose(decoder->private_->file); decoder->private_->file = 0; } if(decoder->private_->do_md5_checking) { if(memcmp(decoder->private_->stream_info.data.stream_info.md5sum, decoder->private_->computed_md5sum, 16)) md5_failed = true; } decoder->private_->is_seeking = false; set_defaults_(decoder); decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED; return !md5_failed; } FLAC_API FLAC__bool FLAC__stream_decoder_set_ogg_serial_number(FLAC__StreamDecoder *decoder, long value) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->private_); FLAC__ASSERT(0 != decoder->protected_); if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) return false; #if FLAC__HAS_OGG /* can't check decoder->private_->is_ogg since that's not set until init time */ FLAC__ogg_decoder_aspect_set_serial_number(&decoder->protected_->ogg_decoder_aspect, value); return true; #else (void)value; return false; #endif } FLAC_API FLAC__bool FLAC__stream_decoder_set_md5_checking(FLAC__StreamDecoder *decoder, FLAC__bool value) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->protected_); if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) return false; decoder->protected_->md5_checking = value; return true; } FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->private_); FLAC__ASSERT(0 != decoder->protected_); FLAC__ASSERT((uint32_t)type <= FLAC__MAX_METADATA_TYPE_CODE); /* double protection */ if((uint32_t)type > FLAC__MAX_METADATA_TYPE_CODE) return false; if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) return false; decoder->private_->metadata_filter[type] = true; if(type == FLAC__METADATA_TYPE_APPLICATION) decoder->private_->metadata_filter_ids_count = 0; return true; } FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4]) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->private_); FLAC__ASSERT(0 != decoder->protected_); FLAC__ASSERT(0 != id); if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) return false; if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION]) return true; FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids); if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) { if(0 == (decoder->private_->metadata_filter_ids = safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) { decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; return false; } decoder->private_->metadata_filter_ids_capacity *= 2; } memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)); decoder->private_->metadata_filter_ids_count++; return true; } FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder) { uint32_t i; FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->private_); FLAC__ASSERT(0 != decoder->protected_); if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) return false; for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++) decoder->private_->metadata_filter[i] = true; decoder->private_->metadata_filter_ids_count = 0; return true; } FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->private_); FLAC__ASSERT(0 != decoder->protected_); FLAC__ASSERT((uint32_t)type <= FLAC__MAX_METADATA_TYPE_CODE); /* double protection */ if((uint32_t)type > FLAC__MAX_METADATA_TYPE_CODE) return false; if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) return false; decoder->private_->metadata_filter[type] = false; if(type == FLAC__METADATA_TYPE_APPLICATION) decoder->private_->metadata_filter_ids_count = 0; return true; } FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4]) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->private_); FLAC__ASSERT(0 != decoder->protected_); FLAC__ASSERT(0 != id); if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) return false; if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION]) return true; FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids); if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) { if(0 == (decoder->private_->metadata_filter_ids = safe_realloc_mul_2op_(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity, /*times*/2))) { decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; return false; } decoder->private_->metadata_filter_ids_capacity *= 2; } memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)); decoder->private_->metadata_filter_ids_count++; return true; } FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->private_); FLAC__ASSERT(0 != decoder->protected_); if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) return false; memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter)); decoder->private_->metadata_filter_ids_count = 0; return true; } FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->protected_); return decoder->protected_->state; } FLAC_API const char *FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder *decoder) { return FLAC__StreamDecoderStateString[decoder->protected_->state]; } FLAC_API FLAC__bool FLAC__stream_decoder_get_md5_checking(const FLAC__StreamDecoder *decoder) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->protected_); return decoder->protected_->md5_checking; } FLAC_API FLAC__uint64 FLAC__stream_decoder_get_total_samples(const FLAC__StreamDecoder *decoder) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->protected_); return decoder->private_->has_stream_info? decoder->private_->stream_info.data.stream_info.total_samples : 0; } FLAC_API uint32_t FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->protected_); return decoder->protected_->channels; } FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->protected_); return decoder->protected_->channel_assignment; } FLAC_API uint32_t FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->protected_); return decoder->protected_->bits_per_sample; } FLAC_API uint32_t FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->protected_); return decoder->protected_->sample_rate; } FLAC_API uint32_t FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->protected_); return decoder->protected_->blocksize; } FLAC_API FLAC__bool FLAC__stream_decoder_get_decode_position(const FLAC__StreamDecoder *decoder, FLAC__uint64 *position) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->private_); FLAC__ASSERT(0 != position); if(FLAC__HAS_OGG && decoder->private_->is_ogg) return false; if(0 == decoder->private_->tell_callback) return false; if(decoder->private_->tell_callback(decoder, position, decoder->private_->client_data) != FLAC__STREAM_DECODER_TELL_STATUS_OK) return false; /* should never happen since all FLAC frames and metadata blocks are byte aligned, but check just in case */ if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) return false; FLAC__ASSERT(*position >= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder)); *position -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder); return true; } FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->private_); FLAC__ASSERT(0 != decoder->protected_); if(!decoder->private_->internal_reset_hack && decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED) return false; decoder->private_->samples_decoded = 0; decoder->private_->do_md5_checking = false; #if FLAC__HAS_OGG if(decoder->private_->is_ogg) FLAC__ogg_decoder_aspect_flush(&decoder->protected_->ogg_decoder_aspect); #endif if(!FLAC__bitreader_clear(decoder->private_->input)) { decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; return false; } decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; return true; } FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->private_); FLAC__ASSERT(0 != decoder->protected_); if(!FLAC__stream_decoder_flush(decoder)) { /* above call sets the state for us */ return false; } #if FLAC__HAS_OGG /*@@@ could go in !internal_reset_hack block below */ if(decoder->private_->is_ogg) FLAC__ogg_decoder_aspect_reset(&decoder->protected_->ogg_decoder_aspect); #endif /* Rewind if necessary. If FLAC__stream_decoder_init() is calling us, * (internal_reset_hack) don't try to rewind since we are already at * the beginning of the stream and don't want to fail if the input is * not seekable. */ if(!decoder->private_->internal_reset_hack) { if(decoder->private_->file == stdin) return false; /* can't rewind stdin, reset fails */ if(decoder->private_->seek_callback && decoder->private_->seek_callback(decoder, 0, decoder->private_->client_data) == FLAC__STREAM_DECODER_SEEK_STATUS_ERROR) return false; /* seekable and seek fails, reset fails */ } else decoder->private_->internal_reset_hack = false; decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA; decoder->private_->has_stream_info = false; free(decoder->private_->seek_table.data.seek_table.points); decoder->private_->seek_table.data.seek_table.points = 0; decoder->private_->has_seek_table = false; decoder->private_->do_md5_checking = decoder->protected_->md5_checking; /* * This goes in reset() and not flush() because according to the spec, a * fixed-blocksize stream must stay that way through the whole stream. */ decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size = 0; /* We initialize the FLAC__MD5Context even though we may never use it. This * is because md5 checking may be turned on to start and then turned off if * a seek occurs. So we init the context here and finalize it in * FLAC__stream_decoder_finish() to make sure things are always cleaned up * properly. */ FLAC__MD5Init(&decoder->private_->md5context); decoder->private_->first_frame_offset = 0; decoder->private_->unparseable_frame_count = 0; return true; } FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder) { FLAC__bool got_a_frame; FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->protected_); while(1) { switch(decoder->protected_->state) { case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA: if(!find_metadata_(decoder)) return false; /* above function sets the status for us */ break; case FLAC__STREAM_DECODER_READ_METADATA: if(!read_metadata_(decoder)) return false; /* above function sets the status for us */ else return true; case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC: if(!frame_sync_(decoder)) return true; /* above function sets the status for us */ break; case FLAC__STREAM_DECODER_READ_FRAME: if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/true)) return false; /* above function sets the status for us */ if(got_a_frame) return true; /* above function sets the status for us */ break; case FLAC__STREAM_DECODER_END_OF_STREAM: case FLAC__STREAM_DECODER_ABORTED: return true; default: FLAC__ASSERT(0); return false; } } } FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->protected_); while(1) { switch(decoder->protected_->state) { case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA: if(!find_metadata_(decoder)) return false; /* above function sets the status for us */ break; case FLAC__STREAM_DECODER_READ_METADATA: if(!read_metadata_(decoder)) return false; /* above function sets the status for us */ break; case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC: case FLAC__STREAM_DECODER_READ_FRAME: case FLAC__STREAM_DECODER_END_OF_STREAM: case FLAC__STREAM_DECODER_ABORTED: return true; default: FLAC__ASSERT(0); return false; } } } FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder) { FLAC__bool dummy; FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->protected_); while(1) { switch(decoder->protected_->state) { case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA: if(!find_metadata_(decoder)) return false; /* above function sets the status for us */ break; case FLAC__STREAM_DECODER_READ_METADATA: if(!read_metadata_(decoder)) return false; /* above function sets the status for us */ break; case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC: if(!frame_sync_(decoder)) return true; /* above function sets the status for us */ break; case FLAC__STREAM_DECODER_READ_FRAME: if(!read_frame_(decoder, &dummy, /*do_full_decode=*/true)) return false; /* above function sets the status for us */ break; case FLAC__STREAM_DECODER_END_OF_STREAM: case FLAC__STREAM_DECODER_ABORTED: return true; default: FLAC__ASSERT(0); return false; } } } FLAC_API FLAC__bool FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder *decoder) { FLAC__bool got_a_frame; FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->protected_); while(1) { switch(decoder->protected_->state) { case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA: case FLAC__STREAM_DECODER_READ_METADATA: return false; /* above function sets the status for us */ case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC: if(!frame_sync_(decoder)) return true; /* above function sets the status for us */ break; case FLAC__STREAM_DECODER_READ_FRAME: if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/false)) return false; /* above function sets the status for us */ if(got_a_frame) return true; /* above function sets the status for us */ break; case FLAC__STREAM_DECODER_END_OF_STREAM: case FLAC__STREAM_DECODER_ABORTED: return true; default: FLAC__ASSERT(0); return false; } } } FLAC_API FLAC__bool FLAC__stream_decoder_seek_absolute(FLAC__StreamDecoder *decoder, FLAC__uint64 sample) { FLAC__uint64 length; FLAC__ASSERT(0 != decoder); if( decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_METADATA && decoder->protected_->state != FLAC__STREAM_DECODER_READ_METADATA && decoder->protected_->state != FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC && decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME && decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM ) return false; if(0 == decoder->private_->seek_callback) return false; FLAC__ASSERT(decoder->private_->seek_callback); FLAC__ASSERT(decoder->private_->tell_callback); FLAC__ASSERT(decoder->private_->length_callback); FLAC__ASSERT(decoder->private_->eof_callback); if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder)) return false; decoder->private_->is_seeking = true; /* turn off md5 checking if a seek is attempted */ decoder->private_->do_md5_checking = false; /* get the file length (currently our algorithm needs to know the length so it's also an error to get FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED) */ if(decoder->private_->length_callback(decoder, &length, decoder->private_->client_data) != FLAC__STREAM_DECODER_LENGTH_STATUS_OK) { decoder->private_->is_seeking = false; return false; } /* if we haven't finished processing the metadata yet, do that so we have the STREAMINFO, SEEK_TABLE, and first_frame_offset */ if( decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_METADATA || decoder->protected_->state == FLAC__STREAM_DECODER_READ_METADATA ) { if(!FLAC__stream_decoder_process_until_end_of_metadata(decoder)) { /* above call sets the state for us */ decoder->private_->is_seeking = false; return false; } /* check this again in case we didn't know total_samples the first time */ if(FLAC__stream_decoder_get_total_samples(decoder) > 0 && sample >= FLAC__stream_decoder_get_total_samples(decoder)) { decoder->private_->is_seeking = false; return false; } } { const FLAC__bool ok = #if FLAC__HAS_OGG decoder->private_->is_ogg? seek_to_absolute_sample_ogg_(decoder, length, sample) : #endif seek_to_absolute_sample_(decoder, length, sample) ; decoder->private_->is_seeking = false; return ok; } } /*********************************************************************** * * Protected class methods * ***********************************************************************/ uint32_t FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder) { FLAC__ASSERT(0 != decoder); FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); FLAC__ASSERT(!(FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) & 7)); return FLAC__bitreader_get_input_bits_unconsumed(decoder->private_->input) / 8; } /*********************************************************************** * * Private class methods * ***********************************************************************/ void set_defaults_(FLAC__StreamDecoder *decoder) { decoder->private_->is_ogg = false; decoder->private_->read_callback = 0; decoder->private_->seek_callback = 0; decoder->private_->tell_callback = 0; decoder->private_->length_callback = 0; decoder->private_->eof_callback = 0; decoder->private_->write_callback = 0; decoder->private_->metadata_callback = 0; decoder->private_->error_callback = 0; decoder->private_->client_data = 0; memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter)); decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true; decoder->private_->metadata_filter_ids_count = 0; decoder->protected_->md5_checking = false; #if FLAC__HAS_OGG FLAC__ogg_decoder_aspect_set_defaults(&decoder->protected_->ogg_decoder_aspect); #endif } /* * This will forcibly set stdin to binary mode (for OSes that require it) */ FILE *get_binary_stdin_(void) { /* if something breaks here it is probably due to the presence or * absence of an underscore before the identifiers 'setmode', * 'fileno', and/or 'O_BINARY'; check your system header files. */ #if defined _MSC_VER || defined __MINGW32__ _setmode(_fileno(stdin), _O_BINARY); #elif defined __EMX__ setmode(fileno(stdin), O_BINARY); #endif return stdin; } FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, uint32_t size, uint32_t channels) { uint32_t i; FLAC__int32 *tmp; if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels) return true; /* simply using realloc() is not practical because the number of channels may change mid-stream */ for(i = 0; i < FLAC__MAX_CHANNELS; i++) { if(0 != decoder->private_->output[i]) { free(decoder->private_->output[i]-4); decoder->private_->output[i] = 0; } if(0 != decoder->private_->residual_unaligned[i]) { free(decoder->private_->residual_unaligned[i]); decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0; } } for(i = 0; i < channels; i++) { /* WATCHOUT: * FLAC__lpc_restore_signal_asm_ia32_mmx() and ..._intrin_sseN() * require that the output arrays have a buffer of up to 3 zeroes * in front (at negative indices) for alignment purposes; * we use 4 to keep the data well-aligned. */ tmp = safe_malloc_muladd2_(sizeof(FLAC__int32), /*times (*/size, /*+*/4/*)*/); if(tmp == 0) { decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; return false; } memset(tmp, 0, sizeof(FLAC__int32)*4); decoder->private_->output[i] = tmp + 4; if(!FLAC__memory_alloc_aligned_int32_array(size, &decoder->private_->residual_unaligned[i], &decoder->private_->residual[i])) { decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; return false; } } decoder->private_->output_capacity = size; decoder->private_->output_channels = channels; return true; } FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id) { size_t i; FLAC__ASSERT(0 != decoder); FLAC__ASSERT(0 != decoder->private_); for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++) if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8))) return true; return false; } FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder) { FLAC__uint32 x; uint32_t i, id; FLAC__bool first = true; FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); for(i = id = 0; i < 4; ) { if(decoder->private_->cached) { x = (FLAC__uint32)decoder->private_->lookahead; decoder->private_->cached = false; } else { if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) return false; /* read_callback_ sets the state for us */ } if(x == FLAC__STREAM_SYNC_STRING[i]) { first = true; i++; id = 0; continue; } if(id >= 3) return false; if(x == ID3V2_TAG_[id]) { id++; i = 0; if(id == 3) { if(!skip_id3v2_tag_(decoder)) return false; /* skip_id3v2_tag_ sets the state for us */ } continue; } id = 0; if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ decoder->private_->header_warmup[0] = (FLAC__byte)x; if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) return false; /* read_callback_ sets the state for us */ /* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */ /* else we have to check if the second byte is the end of a sync code */ if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ decoder->private_->lookahead = (FLAC__byte)x; decoder->private_->cached = true; } else if(x >> 1 == 0x7c) { /* MAGIC NUMBER for the last 6 sync bits and reserved 7th bit */ decoder->private_->header_warmup[1] = (FLAC__byte)x; decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME; return true; } } i = 0; if(first) { send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); first = false; } } decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA; return true; } FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder) { FLAC__bool is_last; FLAC__uint32 i, x, type, length; FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_IS_LAST_LEN)) return false; /* read_callback_ sets the state for us */ is_last = x? true : false; if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN)) return false; /* read_callback_ sets the state for us */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN)) return false; /* read_callback_ sets the state for us */ if(type == FLAC__METADATA_TYPE_STREAMINFO) { if(!read_metadata_streaminfo_(decoder, is_last, length)) return false; decoder->private_->has_stream_info = true; if(0 == memcmp(decoder->private_->stream_info.data.stream_info.md5sum, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 16)) decoder->private_->do_md5_checking = false; if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] && decoder->private_->metadata_callback) decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data); } else if(type == FLAC__METADATA_TYPE_SEEKTABLE) { /* just in case we already have a seek table, and reading the next one fails: */ decoder->private_->has_seek_table = false; if(!read_metadata_seektable_(decoder, is_last, length)) return false; decoder->private_->has_seek_table = true; if(!decoder->private_->is_seeking && decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE] && decoder->private_->metadata_callback) decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data); } else { FLAC__bool skip_it = !decoder->private_->metadata_filter[type]; uint32_t real_length = length; FLAC__StreamMetadata block; memset(&block, 0, sizeof(block)); block.is_last = is_last; block.type = (FLAC__MetadataType)type; block.length = length; if(type == FLAC__METADATA_TYPE_APPLICATION) { if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)) return false; /* read_callback_ sets the state for us */ if(real_length < FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) { /* underflow check */ decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;/*@@@@@@ maybe wrong error? need to resync?*/ return false; } real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8; if(decoder->private_->metadata_filter_ids_count > 0 && has_id_filtered_(decoder, block.data.application.id)) skip_it = !skip_it; } if(skip_it) { if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length)) return false; /* read_callback_ sets the state for us */ } else { FLAC__bool ok = true; switch(type) { case FLAC__METADATA_TYPE_PADDING: /* skip the padding bytes */ if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, real_length)) ok = false; /* read_callback_ sets the state for us */ break; case FLAC__METADATA_TYPE_APPLICATION: /* remember, we read the ID already */ if(real_length > 0) { if(0 == (block.data.application.data = malloc(real_length))) { decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; ok = false; } else if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.data, real_length)) ok = false; /* read_callback_ sets the state for us */ } else block.data.application.data = 0; break; case FLAC__METADATA_TYPE_VORBIS_COMMENT: if(!read_metadata_vorbiscomment_(decoder, &block.data.vorbis_comment, real_length)) ok = false; break; case FLAC__METADATA_TYPE_CUESHEET: if(!read_metadata_cuesheet_(decoder, &block.data.cue_sheet)) ok = false; break; case FLAC__METADATA_TYPE_PICTURE: if(!read_metadata_picture_(decoder, &block.data.picture)) ok = false; break; case FLAC__METADATA_TYPE_STREAMINFO: case FLAC__METADATA_TYPE_SEEKTABLE: FLAC__ASSERT(0); break; default: if(real_length > 0) { if(0 == (block.data.unknown.data = malloc(real_length))) { decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; ok = false; } else if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.unknown.data, real_length)) ok = false; /* read_callback_ sets the state for us */ } else block.data.unknown.data = 0; break; } if(ok && !decoder->private_->is_seeking && decoder->private_->metadata_callback) decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data); /* now we have to free any malloc()ed data in the block */ switch(type) { case FLAC__METADATA_TYPE_PADDING: break; case FLAC__METADATA_TYPE_APPLICATION: if(0 != block.data.application.data) free(block.data.application.data); break; case FLAC__METADATA_TYPE_VORBIS_COMMENT: if(0 != block.data.vorbis_comment.vendor_string.entry) free(block.data.vorbis_comment.vendor_string.entry); if(block.data.vorbis_comment.num_comments > 0) for(i = 0; i < block.data.vorbis_comment.num_comments; i++) if(0 != block.data.vorbis_comment.comments[i].entry) free(block.data.vorbis_comment.comments[i].entry); if(0 != block.data.vorbis_comment.comments) free(block.data.vorbis_comment.comments); break; case FLAC__METADATA_TYPE_CUESHEET: if(block.data.cue_sheet.num_tracks > 0) for(i = 0; i < block.data.cue_sheet.num_tracks; i++) if(0 != block.data.cue_sheet.tracks[i].indices) free(block.data.cue_sheet.tracks[i].indices); if(0 != block.data.cue_sheet.tracks) free(block.data.cue_sheet.tracks); break; case FLAC__METADATA_TYPE_PICTURE: if(0 != block.data.picture.mime_type) free(block.data.picture.mime_type); if(0 != block.data.picture.description) free(block.data.picture.description); if(0 != block.data.picture.data) free(block.data.picture.data); break; case FLAC__METADATA_TYPE_STREAMINFO: case FLAC__METADATA_TYPE_SEEKTABLE: FLAC__ASSERT(0); default: if(0 != block.data.unknown.data) free(block.data.unknown.data); break; } if(!ok) /* anything that unsets "ok" should also make sure decoder->protected_->state is updated */ return false; } } if(is_last) { /* if this fails, it's OK, it's just a hint for the seek routine */ if(!FLAC__stream_decoder_get_decode_position(decoder, &decoder->private_->first_frame_offset)) decoder->private_->first_frame_offset = 0; decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; } return true; } FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length) { FLAC__uint32 x; uint32_t bits, used_bits = 0; FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); decoder->private_->stream_info.type = FLAC__METADATA_TYPE_STREAMINFO; decoder->private_->stream_info.is_last = is_last; decoder->private_->stream_info.length = length; bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN; if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, bits)) return false; /* read_callback_ sets the state for us */ decoder->private_->stream_info.data.stream_info.min_blocksize = x; used_bits += bits; bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN; if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN)) return false; /* read_callback_ sets the state for us */ decoder->private_->stream_info.data.stream_info.max_blocksize = x; used_bits += bits; bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN; if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN)) return false; /* read_callback_ sets the state for us */ decoder->private_->stream_info.data.stream_info.min_framesize = x; used_bits += bits; bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN; if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN)) return false; /* read_callback_ sets the state for us */ decoder->private_->stream_info.data.stream_info.max_framesize = x; used_bits += bits; bits = FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN; if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN)) return false; /* read_callback_ sets the state for us */ decoder->private_->stream_info.data.stream_info.sample_rate = x; used_bits += bits; bits = FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN; if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN)) return false; /* read_callback_ sets the state for us */ decoder->private_->stream_info.data.stream_info.channels = x+1; used_bits += bits; bits = FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN; if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN)) return false; /* read_callback_ sets the state for us */ decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1; used_bits += bits; bits = FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN; if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &decoder->private_->stream_info.data.stream_info.total_samples, FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN)) return false; /* read_callback_ sets the state for us */ used_bits += bits; if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16)) return false; /* read_callback_ sets the state for us */ used_bits += 16*8; /* skip the rest of the block */ FLAC__ASSERT(used_bits % 8 == 0); if (length < (used_bits / 8)) return false; /* read_callback_ sets the state for us */ length -= (used_bits / 8); if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length)) return false; /* read_callback_ sets the state for us */ return true; } FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, uint32_t length) { FLAC__uint32 i, x; FLAC__uint64 xx; FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); decoder->private_->seek_table.type = FLAC__METADATA_TYPE_SEEKTABLE; decoder->private_->seek_table.is_last = is_last; decoder->private_->seek_table.length = length; decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH; /* use realloc since we may pass through here several times (e.g. after seeking) */ if(0 == (decoder->private_->seek_table.data.seek_table.points = safe_realloc_mul_2op_(decoder->private_->seek_table.data.seek_table.points, decoder->private_->seek_table.data.seek_table.num_points, /*times*/sizeof(FLAC__StreamMetadata_SeekPoint)))) { decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; return false; } for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) { if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN)) return false; /* read_callback_ sets the state for us */ decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx; if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN)) return false; /* read_callback_ sets the state for us */ decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx; if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN)) return false; /* read_callback_ sets the state for us */ decoder->private_->seek_table.data.seek_table.points[i].frame_samples = x; } length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH); /* if there is a partial point left, skip over it */ if(length > 0) { /*@@@ do a send_error_to_client_() here? there's an argument for either way */ if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length)) return false; /* read_callback_ sets the state for us */ } return true; } FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj, uint32_t length) { FLAC__uint32 i; FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); /* read vendor string */ if (length >= 8) { length -= 8; /* vendor string length + num comments entries alone take 8 bytes */ FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32); if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->vendor_string.length)) return false; /* read_callback_ sets the state for us */ if (obj->vendor_string.length > 0) { if (length < obj->vendor_string.length) { obj->vendor_string.length = 0; obj->vendor_string.entry = 0; goto skip; } else length -= obj->vendor_string.length; if (0 == (obj->vendor_string.entry = safe_malloc_add_2op_(obj->vendor_string.length, /*+*/1))) { decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; return false; } if (!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->vendor_string.entry, obj->vendor_string.length)) return false; /* read_callback_ sets the state for us */ obj->vendor_string.entry[obj->vendor_string.length] = '\0'; } else obj->vendor_string.entry = 0; /* read num comments */ FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN == 32); if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->num_comments)) return false; /* read_callback_ sets the state for us */ /* read comments */ if (obj->num_comments > 100000) { /* Possibly malicious file. */ obj->num_comments = 0; return false; } if (obj->num_comments > 0) { if (0 == (obj->comments = safe_malloc_mul_2op_p(obj->num_comments, /*times*/sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) { obj->num_comments = 0; decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; return false; } for (i = 0; i < obj->num_comments; i++) { /* Initialize here just to make sure. */ obj->comments[i].length = 0; obj->comments[i].entry = 0; FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32); if (length < 4) { obj->num_comments = i; goto skip; } else length -= 4; if (!FLAC__bitreader_read_uint32_little_endian(decoder->private_->input, &obj->comments[i].length)) { obj->num_comments = i; return false; /* read_callback_ sets the state for us */ } if (obj->comments[i].length > 0) { if (length < obj->comments[i].length) { obj->num_comments = i; goto skip; } else length -= obj->comments[i].length; if (0 == (obj->comments[i].entry = safe_malloc_add_2op_(obj->comments[i].length, /*+*/1))) { decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; obj->num_comments = i; return false; } memset (obj->comments[i].entry, 0, obj->comments[i].length) ; if (!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->comments[i].entry, obj->comments[i].length)) { /* Current i-th entry is bad, so we delete it. */ free (obj->comments[i].entry) ; obj->comments[i].entry = NULL ; obj->num_comments = i; goto skip; } obj->comments[i].entry[obj->comments[i].length] = '\0'; } else obj->comments[i].entry = 0; } } } skip: if (length > 0) { /* length > 0 can only happen on files with invalid data in comments */ if(obj->num_comments < 1) { free(obj->comments); obj->comments = NULL; } if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, length)) return false; /* read_callback_ sets the state for us */ } return true; } FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj) { FLAC__uint32 i, j, x; FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); memset(obj, 0, sizeof(FLAC__StreamMetadata_CueSheet)); FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0); if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->media_catalog_number, FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN/8)) return false; /* read_callback_ sets the state for us */ if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &obj->lead_in, FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN)) return false; /* read_callback_ sets the state for us */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN)) return false; /* read_callback_ sets the state for us */ obj->is_cd = x? true : false; if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN)) return false; /* read_callback_ sets the state for us */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN)) return false; /* read_callback_ sets the state for us */ obj->num_tracks = x; if(obj->num_tracks > 0) { if(0 == (obj->tracks = safe_calloc_(obj->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track)))) { decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; return false; } for(i = 0; i < obj->num_tracks; i++) { FLAC__StreamMetadata_CueSheet_Track *track = &obj->tracks[i]; if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &track->offset, FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN)) return false; /* read_callback_ sets the state for us */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN)) return false; /* read_callback_ sets the state for us */ track->number = (FLAC__byte)x; FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0); if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)track->isrc, FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN/8)) return false; /* read_callback_ sets the state for us */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN)) return false; /* read_callback_ sets the state for us */ track->type = x; if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN)) return false; /* read_callback_ sets the state for us */ track->pre_emphasis = x; if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN)) return false; /* read_callback_ sets the state for us */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN)) return false; /* read_callback_ sets the state for us */ track->num_indices = (FLAC__byte)x; if(track->num_indices > 0) { if(0 == (track->indices = safe_calloc_(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index)))) { decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; return false; } for(j = 0; j < track->num_indices; j++) { FLAC__StreamMetadata_CueSheet_Index *indx = &track->indices[j]; if(!FLAC__bitreader_read_raw_uint64(decoder->private_->input, &indx->offset, FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN)) return false; /* read_callback_ sets the state for us */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN)) return false; /* read_callback_ sets the state for us */ indx->number = (FLAC__byte)x; if(!FLAC__bitreader_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN)) return false; /* read_callback_ sets the state for us */ } } } } return true; } FLAC__bool read_metadata_picture_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_Picture *obj) { FLAC__uint32 x; FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); /* read type */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_TYPE_LEN)) return false; /* read_callback_ sets the state for us */ obj->type = x; /* read MIME type */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN)) return false; /* read_callback_ sets the state for us */ if(0 == (obj->mime_type = safe_malloc_add_2op_(x, /*+*/1))) { decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; return false; } if(x > 0) { if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->mime_type, x)) return false; /* read_callback_ sets the state for us */ } obj->mime_type[x] = '\0'; /* read description */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN)) return false; /* read_callback_ sets the state for us */ if(0 == (obj->description = safe_malloc_add_2op_(x, /*+*/1))) { decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; return false; } if(x > 0) { if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->description, x)) return false; /* read_callback_ sets the state for us */ } obj->description[x] = '\0'; /* read width */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->width, FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN)) return false; /* read_callback_ sets the state for us */ /* read height */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->height, FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN)) return false; /* read_callback_ sets the state for us */ /* read depth */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->depth, FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN)) return false; /* read_callback_ sets the state for us */ /* read colors */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &obj->colors, FLAC__STREAM_METADATA_PICTURE_COLORS_LEN)) return false; /* read_callback_ sets the state for us */ /* read data */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &(obj->data_length), FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN)) return false; /* read_callback_ sets the state for us */ if(0 == (obj->data = safe_malloc_(obj->data_length))) { decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; return false; } if(obj->data_length > 0) { if(!FLAC__bitreader_read_byte_block_aligned_no_crc(decoder->private_->input, obj->data, obj->data_length)) return false; /* read_callback_ sets the state for us */ } return true; } FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder) { FLAC__uint32 x; uint32_t i, skip; /* skip the version and flags bytes */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 24)) return false; /* read_callback_ sets the state for us */ /* get the size (in bytes) to skip */ skip = 0; for(i = 0; i < 4; i++) { if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) return false; /* read_callback_ sets the state for us */ skip <<= 7; skip |= (x & 0x7f); } /* skip the rest of the tag */ if(!FLAC__bitreader_skip_byte_block_aligned_no_crc(decoder->private_->input, skip)) return false; /* read_callback_ sets the state for us */ return true; } FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder) { FLAC__uint32 x; FLAC__bool first = true; /* If we know the total number of samples in the stream, stop if we've read that many. */ /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */ if(FLAC__stream_decoder_get_total_samples(decoder) > 0) { if(decoder->private_->samples_decoded >= FLAC__stream_decoder_get_total_samples(decoder)) { decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM; return true; } } /* make sure we're byte aligned */ if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) { if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input))) return false; /* read_callback_ sets the state for us */ } while(1) { if(decoder->private_->cached) { x = (FLAC__uint32)decoder->private_->lookahead; decoder->private_->cached = false; } else { if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) return false; /* read_callback_ sets the state for us */ } if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ decoder->private_->header_warmup[0] = (FLAC__byte)x; if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) return false; /* read_callback_ sets the state for us */ /* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */ /* else we have to check if the second byte is the end of a sync code */ if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ decoder->private_->lookahead = (FLAC__byte)x; decoder->private_->cached = true; } else if(x >> 1 == 0x7c) { /* MAGIC NUMBER for the last 6 sync bits and reserved 7th bit */ decoder->private_->header_warmup[1] = (FLAC__byte)x; decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME; return true; } } if(first) { send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); first = false; } } return true; } FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode) { uint32_t channel; uint32_t i; FLAC__int32 mid, side; uint32_t frame_crc; /* the one we calculate from the input stream */ FLAC__uint32 x; *got_a_frame = false; /* init the CRC */ frame_crc = 0; frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc); frame_crc = FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc); FLAC__bitreader_reset_read_crc16(decoder->private_->input, (FLAC__uint16)frame_crc); if(!read_frame_header_(decoder)) return false; if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means we didn't sync on a valid header */ return true; if(!allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels)) return false; for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) { /* * first figure the correct bits-per-sample of the subframe */ uint32_t bps = decoder->private_->frame.header.bits_per_sample; switch(decoder->private_->frame.header.channel_assignment) { case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT: /* no adjustment needed */ break; case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE: FLAC__ASSERT(decoder->private_->frame.header.channels == 2); if(channel == 1) bps++; break; case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE: FLAC__ASSERT(decoder->private_->frame.header.channels == 2); if(channel == 0) bps++; break; case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE: FLAC__ASSERT(decoder->private_->frame.header.channels == 2); if(channel == 1) bps++; break; default: FLAC__ASSERT(0); } /* * now read it */ if(!read_subframe_(decoder, channel, bps, do_full_decode)) return false; if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */ return true; } if(!read_zero_padding_(decoder)) return false; if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption (i.e. "zero bits" were not all zeroes) */ return true; /* * Read the frame CRC-16 from the footer and check */ frame_crc = FLAC__bitreader_get_read_crc16(decoder->private_->input); if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN)) return false; /* read_callback_ sets the state for us */ if(frame_crc == x) { if(do_full_decode) { /* Undo any special channel coding */ switch(decoder->private_->frame.header.channel_assignment) { case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT: /* do nothing */ break; case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE: FLAC__ASSERT(decoder->private_->frame.header.channels == 2); for(i = 0; i < decoder->private_->frame.header.blocksize; i++) decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i]; break; case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE: FLAC__ASSERT(decoder->private_->frame.header.channels == 2); for(i = 0; i < decoder->private_->frame.header.blocksize; i++) decoder->private_->output[0][i] += decoder->private_->output[1][i]; break; case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE: FLAC__ASSERT(decoder->private_->frame.header.channels == 2); for(i = 0; i < decoder->private_->frame.header.blocksize; i++) { #if 1 mid = decoder->private_->output[0][i]; side = decoder->private_->output[1][i]; mid = ((uint32_t) mid) << 1; mid |= (side & 1); /* i.e. if 'side' is odd... */ decoder->private_->output[0][i] = (mid + side) >> 1; decoder->private_->output[1][i] = (mid - side) >> 1; #else /* OPT: without 'side' temp variable */ mid = (decoder->private_->output[0][i] << 1) | (decoder->private_->output[1][i] & 1); /* i.e. if 'side' is odd... */ decoder->private_->output[0][i] = (mid + decoder->private_->output[1][i]) >> 1; decoder->private_->output[1][i] = (mid - decoder->private_->output[1][i]) >> 1; #endif } break; default: FLAC__ASSERT(0); break; } } } else { /* Bad frame, emit error and zero the output signal */ send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH); if(do_full_decode) { for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) { memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize); } } } *got_a_frame = true; /* we wait to update fixed_block_size until here, when we're sure we've got a proper frame and hence a correct blocksize */ if(decoder->private_->next_fixed_block_size) decoder->private_->fixed_block_size = decoder->private_->next_fixed_block_size; /* put the latest values into the public section of the decoder instance */ decoder->protected_->channels = decoder->private_->frame.header.channels; decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment; decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample; decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate; decoder->protected_->blocksize = decoder->private_->frame.header.blocksize; FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize; /* write it */ if(do_full_decode) { if(write_audio_frame_to_client_(decoder, &decoder->private_->frame, (const FLAC__int32 * const *)decoder->private_->output) != FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE) { decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED; return false; } } decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; return true; } FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder) { FLAC__uint32 x; FLAC__uint64 xx; uint32_t i, blocksize_hint = 0, sample_rate_hint = 0; FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */ uint32_t raw_header_len; FLAC__bool is_unparseable = false; FLAC__ASSERT(FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)); /* init the raw header with the saved bits from synchronization */ raw_header[0] = decoder->private_->header_warmup[0]; raw_header[1] = decoder->private_->header_warmup[1]; raw_header_len = 2; /* check to make sure that reserved bit is 0 */ if(raw_header[1] & 0x02) /* MAGIC NUMBER */ is_unparseable = true; /* * Note that along the way as we read the header, we look for a sync * code inside. If we find one it would indicate that our original * sync was bad since there cannot be a sync code in a valid header. * * Three kinds of things can go wrong when reading the frame header: * 1) We may have sync'ed incorrectly and not landed on a frame header. * If we don't find a sync code, it can end up looking like we read * a valid but unparseable header, until getting to the frame header * CRC. Even then we could get a false positive on the CRC. * 2) We may have sync'ed correctly but on an unparseable frame (from a * future encoder). * 3) We may be on a damaged frame which appears valid but unparseable. * * For all these reasons, we try and read a complete frame header as * long as it seems valid, even if unparseable, up until the frame * header CRC. */ /* * read in the raw header as bytes so we can CRC it, and parse it on the way */ for(i = 0; i < 2; i++) { if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) return false; /* read_callback_ sets the state for us */ if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */ decoder->private_->lookahead = (FLAC__byte)x; decoder->private_->cached = true; send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; return true; } raw_header[raw_header_len++] = (FLAC__byte)x; } switch(x = raw_header[2] >> 4) { case 0: is_unparseable = true; break; case 1: decoder->private_->frame.header.blocksize = 192; break; case 2: case 3: case 4: case 5: decoder->private_->frame.header.blocksize = 576 << (x-2); break; case 6: case 7: blocksize_hint = x; break; case 8: case 9: case 10: case 11: case 12: case 13: case 14: case 15: decoder->private_->frame.header.blocksize = 256 << (x-8); break; default: FLAC__ASSERT(0); break; } switch(x = raw_header[2] & 0x0f) { case 0: if(decoder->private_->has_stream_info) decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate; else is_unparseable = true; break; case 1: decoder->private_->frame.header.sample_rate = 88200; break; case 2: decoder->private_->frame.header.sample_rate = 176400; break; case 3: decoder->private_->frame.header.sample_rate = 192000; break; case 4: decoder->private_->frame.header.sample_rate = 8000; break; case 5: decoder->private_->frame.header.sample_rate = 16000; break; case 6: decoder->private_->frame.header.sample_rate = 22050; break; case 7: decoder->private_->frame.header.sample_rate = 24000; break; case 8: decoder->private_->frame.header.sample_rate = 32000; break; case 9: decoder->private_->frame.header.sample_rate = 44100; break; case 10: decoder->private_->frame.header.sample_rate = 48000; break; case 11: decoder->private_->frame.header.sample_rate = 96000; break; case 12: case 13: case 14: sample_rate_hint = x; break; case 15: send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; return true; default: FLAC__ASSERT(0); } x = (uint32_t)(raw_header[3] >> 4); if(x & 8) { decoder->private_->frame.header.channels = 2; switch(x & 7) { case 0: decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE; break; case 1: decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE; break; case 2: decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE; break; default: is_unparseable = true; break; } } else { decoder->private_->frame.header.channels = (uint32_t)x + 1; decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; } switch(x = (uint32_t)(raw_header[3] & 0x0e) >> 1) { case 0: if(decoder->private_->has_stream_info) decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample; else is_unparseable = true; break; case 1: decoder->private_->frame.header.bits_per_sample = 8; break; case 2: decoder->private_->frame.header.bits_per_sample = 12; break; case 4: decoder->private_->frame.header.bits_per_sample = 16; break; case 5: decoder->private_->frame.header.bits_per_sample = 20; break; case 6: decoder->private_->frame.header.bits_per_sample = 24; break; case 3: case 7: is_unparseable = true; break; default: FLAC__ASSERT(0); break; } /* check to make sure that reserved bit is 0 */ if(raw_header[3] & 0x01) /* MAGIC NUMBER */ is_unparseable = true; /* read the frame's starting sample number (or frame number as the case may be) */ if( raw_header[1] & 0x01 || /*@@@ this clause is a concession to the old way of doing variable blocksize; the only known implementation is flake and can probably be removed without inconveniencing anyone */ (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize != decoder->private_->stream_info.data.stream_info.max_blocksize) ) { /* variable blocksize */ if(!FLAC__bitreader_read_utf8_uint64(decoder->private_->input, &xx, raw_header, &raw_header_len)) return false; /* read_callback_ sets the state for us */ if(xx == FLAC__U64L(0xffffffffffffffff)) { /* i.e. non-UTF8 code... */ decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */ decoder->private_->cached = true; send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; return true; } decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER; decoder->private_->frame.header.number.sample_number = xx; } else { /* fixed blocksize */ if(!FLAC__bitreader_read_utf8_uint32(decoder->private_->input, &x, raw_header, &raw_header_len)) return false; /* read_callback_ sets the state for us */ if(x == 0xffffffff) { /* i.e. non-UTF8 code... */ decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */ decoder->private_->cached = true; send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; return true; } decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER; decoder->private_->frame.header.number.frame_number = x; } if(blocksize_hint) { if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) return false; /* read_callback_ sets the state for us */ raw_header[raw_header_len++] = (FLAC__byte)x; if(blocksize_hint == 7) { FLAC__uint32 _x; if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8)) return false; /* read_callback_ sets the state for us */ raw_header[raw_header_len++] = (FLAC__byte)_x; x = (x << 8) | _x; } decoder->private_->frame.header.blocksize = x+1; } if(sample_rate_hint) { if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) return false; /* read_callback_ sets the state for us */ raw_header[raw_header_len++] = (FLAC__byte)x; if(sample_rate_hint != 12) { FLAC__uint32 _x; if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &_x, 8)) return false; /* read_callback_ sets the state for us */ raw_header[raw_header_len++] = (FLAC__byte)_x; x = (x << 8) | _x; } if(sample_rate_hint == 12) decoder->private_->frame.header.sample_rate = x*1000; else if(sample_rate_hint == 13) decoder->private_->frame.header.sample_rate = x; else decoder->private_->frame.header.sample_rate = x*10; } /* read the CRC-8 byte */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) return false; /* read_callback_ sets the state for us */ crc8 = (FLAC__byte)x; if(FLAC__crc8(raw_header, raw_header_len) != crc8) { send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; return true; } /* calculate the sample number from the frame number if needed */ decoder->private_->next_fixed_block_size = 0; if(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_FRAME_NUMBER) { x = decoder->private_->frame.header.number.frame_number; decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER; if(decoder->private_->fixed_block_size) decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->fixed_block_size * (FLAC__uint64)x; else if(decoder->private_->has_stream_info) { if(decoder->private_->stream_info.data.stream_info.min_blocksize == decoder->private_->stream_info.data.stream_info.max_blocksize) { decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__uint64)x; decoder->private_->next_fixed_block_size = decoder->private_->stream_info.data.stream_info.max_blocksize; } else is_unparseable = true; } else if(x == 0) { decoder->private_->frame.header.number.sample_number = 0; decoder->private_->next_fixed_block_size = decoder->private_->frame.header.blocksize; } else { /* can only get here if the stream has invalid frame numbering and no STREAMINFO, so assume it's not the last (possibly short) frame */ decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->frame.header.blocksize * (FLAC__uint64)x; } } if(is_unparseable) { send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; return true; } return true; } FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode) { FLAC__uint32 x; FLAC__bool wasted_bits; uint32_t i; if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &x, 8)) /* MAGIC NUMBER */ return false; /* read_callback_ sets the state for us */ wasted_bits = (x & 1); x &= 0xfe; if(wasted_bits) { uint32_t u; if(!FLAC__bitreader_read_unary_unsigned(decoder->private_->input, &u)) return false; /* read_callback_ sets the state for us */ decoder->private_->frame.subframes[channel].wasted_bits = u+1; if (decoder->private_->frame.subframes[channel].wasted_bits >= bps) return false; bps -= decoder->private_->frame.subframes[channel].wasted_bits; } else decoder->private_->frame.subframes[channel].wasted_bits = 0; /* * Lots of magic numbers here */ if(x & 0x80) { send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; return true; } else if(x == 0) { if(!read_subframe_constant_(decoder, channel, bps, do_full_decode)) return false; } else if(x == 2) { if(!read_subframe_verbatim_(decoder, channel, bps, do_full_decode)) return false; } else if(x < 16) { send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; return true; } else if(x <= 24) { if(!read_subframe_fixed_(decoder, channel, bps, (x>>1)&7, do_full_decode)) return false; if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */ return true; } else if(x < 64) { send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; return true; } else { if(!read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1, do_full_decode)) return false; if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) /* means bad sync or got corruption */ return true; } if(wasted_bits && do_full_decode) { x = decoder->private_->frame.subframes[channel].wasted_bits; for(i = 0; i < decoder->private_->frame.header.blocksize; i++) { uint32_t val = decoder->private_->output[channel][i]; decoder->private_->output[channel][i] = (val << x); } } return true; } FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode) { FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant; FLAC__int32 x; uint32_t i; FLAC__int32 *output = decoder->private_->output[channel]; decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT; if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps)) return false; /* read_callback_ sets the state for us */ subframe->value = x; /* decode the subframe */ if(do_full_decode) { for(i = 0; i < decoder->private_->frame.header.blocksize; i++) output[i] = x; } return true; } FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode) { FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed; FLAC__int32 i32; FLAC__uint32 u32; uint32_t u; decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED; subframe->residual = decoder->private_->residual[channel]; subframe->order = order; /* read warm-up samples */ for(u = 0; u < order; u++) { if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps)) return false; /* read_callback_ sets the state for us */ subframe->warmup[u] = i32; } /* read entropy coding method info */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN)) return false; /* read_callback_ sets the state for us */ subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32; switch(subframe->entropy_coding_method.type) { case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE: case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2: if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN)) return false; /* read_callback_ sets the state for us */ if(decoder->private_->frame.header.blocksize >> u32 < order) { send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; return true; } subframe->entropy_coding_method.data.partitioned_rice.order = u32; subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel]; break; default: send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; return true; } /* read residual */ switch(subframe->entropy_coding_method.type) { case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE: case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2: if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel], /*is_extended=*/subframe->entropy_coding_method.type == FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2)) return false; break; default: FLAC__ASSERT(0); } /* decode the subframe */ if(do_full_decode) { memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order); FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order); } return true; } FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, const uint32_t order, FLAC__bool do_full_decode) { FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc; FLAC__int32 i32; FLAC__uint32 u32; uint32_t u; decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC; subframe->residual = decoder->private_->residual[channel]; subframe->order = order; /* read warm-up samples */ for(u = 0; u < order; u++) { if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, bps)) return false; /* read_callback_ sets the state for us */ subframe->warmup[u] = i32; } /* read qlp coeff precision */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN)) return false; /* read_callback_ sets the state for us */ if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) { send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; return true; } subframe->qlp_coeff_precision = u32+1; /* read qlp shift */ if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN)) return false; /* read_callback_ sets the state for us */ if(i32 < 0) { send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; return true; } subframe->quantization_level = i32; /* read quantized lp coefficiencts */ for(u = 0; u < order; u++) { if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision)) return false; /* read_callback_ sets the state for us */ subframe->qlp_coeff[u] = i32; } /* read entropy coding method info */ if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN)) return false; /* read_callback_ sets the state for us */ subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32; switch(subframe->entropy_coding_method.type) { case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE: case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2: if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN)) return false; /* read_callback_ sets the state for us */ if(decoder->private_->frame.header.blocksize >> u32 < order) { send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; return true; } subframe->entropy_coding_method.data.partitioned_rice.order = u32; subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel]; break; default: send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM); decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; return true; } /* read residual */ switch(subframe->entropy_coding_method.type) { case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE: case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2: if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel], /*is_extended=*/subframe->entropy_coding_method.type == FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2)) return false; break; default: FLAC__ASSERT(0); } /* decode the subframe */ if(do_full_decode) { memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order); if(bps + subframe->qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32) if(bps <= 16 && subframe->qlp_coeff_precision <= 16) decoder->private_->local_lpc_restore_signal_16bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order); else decoder->private_->local_lpc_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order); else decoder->private_->local_lpc_restore_signal_64bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order); } return true; } FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, uint32_t channel, uint32_t bps, FLAC__bool do_full_decode) { FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim; FLAC__int32 x, *residual = decoder->private_->residual[channel]; uint32_t i; decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM; subframe->data = residual; for(i = 0; i < decoder->private_->frame.header.blocksize; i++) { if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &x, bps)) return false; /* read_callback_ sets the state for us */ residual[i] = x; } /* decode the subframe */ if(do_full_decode) memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize); return true; } FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, uint32_t predictor_order, uint32_t partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual, FLAC__bool is_extended) { FLAC__uint32 rice_parameter; int i; uint32_t partition, sample, u; const uint32_t partitions = 1u << partition_order; const uint32_t partition_samples = decoder->private_->frame.header.blocksize >> partition_order; const uint32_t plen = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN; const uint32_t pesc = is_extended? FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_ESCAPE_PARAMETER : FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER; /* invalid predictor and partition orders mush be handled in the callers */ FLAC__ASSERT(partition_order > 0? partition_samples >= predictor_order : decoder->private_->frame.header.blocksize >= predictor_order); if(!FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, flac_max(6u, partition_order))) { decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; return false; } sample = 0; for(partition = 0; partition < partitions; partition++) { if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, plen)) return false; /* read_callback_ sets the state for us */ partitioned_rice_contents->parameters[partition] = rice_parameter; if(rice_parameter < pesc) { partitioned_rice_contents->raw_bits[partition] = 0; u = (partition == 0) ? partition_samples - predictor_order : partition_samples; if(!FLAC__bitreader_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter)) return false; /* read_callback_ sets the state for us */ sample += u; } else { if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN)) return false; /* read_callback_ sets the state for us */ partitioned_rice_contents->raw_bits[partition] = rice_parameter; for(u = (partition == 0)? predictor_order : 0; u < partition_samples; u++, sample++) { if(!FLAC__bitreader_read_raw_int32(decoder->private_->input, &i, rice_parameter)) return false; /* read_callback_ sets the state for us */ residual[sample] = i; } } } return true; } FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder) { if(!FLAC__bitreader_is_consumed_byte_aligned(decoder->private_->input)) { FLAC__uint32 zero = 0; if(!FLAC__bitreader_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitreader_bits_left_for_byte_alignment(decoder->private_->input))) return false; /* read_callback_ sets the state for us */ if(zero != 0) { send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC); decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; } } return true; } FLAC__bool read_callback_(FLAC__byte buffer[], size_t *bytes, void *client_data) { FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data; if( #if FLAC__HAS_OGG /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */ !decoder->private_->is_ogg && #endif decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data) ) { *bytes = 0; decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM; return false; } else if(*bytes > 0) { /* While seeking, it is possible for our seek to land in the * middle of audio data that looks exactly like a frame header * from a future version of an encoder. When that happens, our * error callback will get an * FLAC__STREAM_DECODER_UNPARSEABLE_STREAM and increment its * unparseable_frame_count. But there is a remote possibility * that it is properly synced at such a "future-codec frame", * so to make sure, we wait to see many "unparseable" errors in * a row before bailing out. */ if(decoder->private_->is_seeking && decoder->private_->unparseable_frame_count > 20) { decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED; return false; } else { const FLAC__StreamDecoderReadStatus status = #if FLAC__HAS_OGG decoder->private_->is_ogg? read_callback_ogg_aspect_(decoder, buffer, bytes) : #endif decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data) ; if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT) { decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED; return false; } else if(*bytes == 0) { if( status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM || ( #if FLAC__HAS_OGG /* see [1] HACK NOTE below for why we don't call the eof_callback when decoding Ogg FLAC */ !decoder->private_->is_ogg && #endif decoder->private_->eof_callback && decoder->private_->eof_callback(decoder, decoder->private_->client_data) ) ) { decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM; return false; } else return true; } else return true; } } else { /* abort to avoid a deadlock */ decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED; return false; } /* [1] @@@ HACK NOTE: The end-of-stream checking has to be hacked around * for Ogg FLAC. This is because the ogg decoder aspect can lose sync * and at the same time hit the end of the stream (for example, seeking * to a point that is after the beginning of the last Ogg page). There * is no way to report an Ogg sync loss through the callbacks (see note * in read_callback_ogg_aspect_()) so it returns CONTINUE with *bytes==0. * So to keep the decoder from stopping at this point we gate the call * to the eof_callback and let the Ogg decoder aspect set the * end-of-stream state when it is needed. */ } #if FLAC__HAS_OGG FLAC__StreamDecoderReadStatus read_callback_ogg_aspect_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes) { switch(FLAC__ogg_decoder_aspect_read_callback_wrapper(&decoder->protected_->ogg_decoder_aspect, buffer, bytes, read_callback_proxy_, decoder, decoder->private_->client_data)) { case FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK: return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE; /* we don't really have a way to handle lost sync via read * callback so we'll let it pass and let the underlying * FLAC decoder catch the error */ case FLAC__OGG_DECODER_ASPECT_READ_STATUS_LOST_SYNC: return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE; case FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM: return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM; case FLAC__OGG_DECODER_ASPECT_READ_STATUS_NOT_FLAC: case FLAC__OGG_DECODER_ASPECT_READ_STATUS_UNSUPPORTED_MAPPING_VERSION: case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT: case FLAC__OGG_DECODER_ASPECT_READ_STATUS_ERROR: case FLAC__OGG_DECODER_ASPECT_READ_STATUS_MEMORY_ALLOCATION_ERROR: return FLAC__STREAM_DECODER_READ_STATUS_ABORT; default: FLAC__ASSERT(0); /* double protection */ return FLAC__STREAM_DECODER_READ_STATUS_ABORT; } } FLAC__OggDecoderAspectReadStatus read_callback_proxy_(const void *void_decoder, FLAC__byte buffer[], size_t *bytes, void *client_data) { FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder*)void_decoder; switch(decoder->private_->read_callback(decoder, buffer, bytes, client_data)) { case FLAC__STREAM_DECODER_READ_STATUS_CONTINUE: return FLAC__OGG_DECODER_ASPECT_READ_STATUS_OK; case FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM: return FLAC__OGG_DECODER_ASPECT_READ_STATUS_END_OF_STREAM; case FLAC__STREAM_DECODER_READ_STATUS_ABORT: return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT; default: /* double protection: */ FLAC__ASSERT(0); return FLAC__OGG_DECODER_ASPECT_READ_STATUS_ABORT; } } #endif FLAC__StreamDecoderWriteStatus write_audio_frame_to_client_(FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 * const buffer[]) { if(decoder->private_->is_seeking) { FLAC__uint64 this_frame_sample = frame->header.number.sample_number; FLAC__uint64 next_frame_sample = this_frame_sample + (FLAC__uint64)frame->header.blocksize; FLAC__uint64 target_sample = decoder->private_->target_sample; FLAC__ASSERT(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); #if FLAC__HAS_OGG decoder->private_->got_a_frame = true; #endif decoder->private_->last_frame = *frame; /* save the frame */ if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */ uint32_t delta = (uint32_t)(target_sample - this_frame_sample); /* kick out of seek mode */ decoder->private_->is_seeking = false; /* shift out the samples before target_sample */ if(delta > 0) { uint32_t channel; const FLAC__int32 *newbuffer[FLAC__MAX_CHANNELS]; for(channel = 0; channel < frame->header.channels; channel++) newbuffer[channel] = buffer[channel] + delta; decoder->private_->last_frame.header.blocksize -= delta; decoder->private_->last_frame.header.number.sample_number += (FLAC__uint64)delta; /* write the relevant samples */ return decoder->private_->write_callback(decoder, &decoder->private_->last_frame, newbuffer, decoder->private_->client_data); } else { /* write the relevant samples */ return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data); } } else { return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; } } else { /* * If we never got STREAMINFO, turn off MD5 checking to save * cycles since we don't have a sum to compare to anyway */ if(!decoder->private_->has_stream_info) decoder->private_->do_md5_checking = false; if(decoder->private_->do_md5_checking) { if(!FLAC__MD5Accumulate(&decoder->private_->md5context, buffer, frame->header.channels, frame->header.blocksize, (frame->header.bits_per_sample+7) / 8)) return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; } return decoder->private_->write_callback(decoder, frame, buffer, decoder->private_->client_data); } } void send_error_to_client_(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status) { if(!decoder->private_->is_seeking) decoder->private_->error_callback(decoder, status, decoder->private_->client_data); else if(status == FLAC__STREAM_DECODER_ERROR_STATUS_UNPARSEABLE_STREAM) decoder->private_->unparseable_frame_count++; } FLAC__bool seek_to_absolute_sample_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample) { FLAC__uint64 first_frame_offset = decoder->private_->first_frame_offset, lower_bound, upper_bound, lower_bound_sample, upper_bound_sample, this_frame_sample; FLAC__int64 pos = -1; int i; uint32_t approx_bytes_per_frame; FLAC__bool first_seek = true; const FLAC__uint64 total_samples = FLAC__stream_decoder_get_total_samples(decoder); const uint32_t min_blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize; const uint32_t max_blocksize = decoder->private_->stream_info.data.stream_info.max_blocksize; const uint32_t max_framesize = decoder->private_->stream_info.data.stream_info.max_framesize; const uint32_t min_framesize = decoder->private_->stream_info.data.stream_info.min_framesize; /* take these from the current frame in case they've changed mid-stream */ uint32_t channels = FLAC__stream_decoder_get_channels(decoder); uint32_t bps = FLAC__stream_decoder_get_bits_per_sample(decoder); const FLAC__StreamMetadata_SeekTable *seek_table = decoder->private_->has_seek_table? &decoder->private_->seek_table.data.seek_table : 0; /* use values from stream info if we didn't decode a frame */ if(channels == 0) channels = decoder->private_->stream_info.data.stream_info.channels; if(bps == 0) bps = decoder->private_->stream_info.data.stream_info.bits_per_sample; /* we are just guessing here */ if(max_framesize > 0) approx_bytes_per_frame = (max_framesize + min_framesize) / 2 + 1; /* * Check if it's a known fixed-blocksize stream. Note that though * the spec doesn't allow zeroes in the STREAMINFO block, we may * never get a STREAMINFO block when decoding so the value of * min_blocksize might be zero. */ else if(min_blocksize == max_blocksize && min_blocksize > 0) { /* note there are no () around 'bps/8' to keep precision up since it's an integer calculation */ approx_bytes_per_frame = min_blocksize * channels * bps/8 + 64; } else approx_bytes_per_frame = 4096 * channels * bps/8 + 64; /* * First, we set an upper and lower bound on where in the * stream we will search. For now we take the current position * as one bound and, depending on where the target position lies, * the beginning of the first frame or the end of the stream as * the other bound. */ lower_bound = first_frame_offset; lower_bound_sample = 0; upper_bound = stream_length; upper_bound_sample = total_samples > 0 ? total_samples : target_sample /*estimate it*/; if(decoder->protected_->state == FLAC__STREAM_DECODER_READ_FRAME) { if(target_sample < decoder->private_->samples_decoded) { if(FLAC__stream_decoder_get_decode_position(decoder, &upper_bound)) upper_bound_sample = decoder->private_->samples_decoded; } else { if(FLAC__stream_decoder_get_decode_position(decoder, &lower_bound)) lower_bound_sample = decoder->private_->samples_decoded; } } /* * Now we refine the bounds if we have a seektable with * suitable points. Note that according to the spec they * must be ordered by ascending sample number. * * Note: to protect against invalid seek tables we will ignore points * that have frame_samples==0 or sample_number>=total_samples */ if(seek_table) { FLAC__uint64 new_lower_bound = lower_bound; FLAC__uint64 new_upper_bound = upper_bound; FLAC__uint64 new_lower_bound_sample = lower_bound_sample; FLAC__uint64 new_upper_bound_sample = upper_bound_sample; /* find the closest seek point <= target_sample, if it exists */ for(i = (int)seek_table->num_points - 1; i >= 0; i--) { if( seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */ (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */ seek_table->points[i].sample_number <= target_sample ) break; } if(i >= 0) { /* i.e. we found a suitable seek point... */ new_lower_bound = first_frame_offset + seek_table->points[i].stream_offset; new_lower_bound_sample = seek_table->points[i].sample_number; } /* find the closest seek point > target_sample, if it exists */ for(i = 0; i < (int)seek_table->num_points; i++) { if( seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && seek_table->points[i].frame_samples > 0 && /* defense against bad seekpoints */ (total_samples <= 0 || seek_table->points[i].sample_number < total_samples) && /* defense against bad seekpoints */ seek_table->points[i].sample_number > target_sample ) break; } if(i < (int)seek_table->num_points) { /* i.e. we found a suitable seek point... */ new_upper_bound = first_frame_offset + seek_table->points[i].stream_offset; new_upper_bound_sample = seek_table->points[i].sample_number; } /* final protection against unsorted seek tables; keep original values if bogus */ if(new_upper_bound >= new_lower_bound) { lower_bound = new_lower_bound; upper_bound = new_upper_bound; lower_bound_sample = new_lower_bound_sample; upper_bound_sample = new_upper_bound_sample; } } FLAC__ASSERT(upper_bound_sample >= lower_bound_sample); /* there are 2 insidious ways that the following equality occurs, which * we need to fix: * 1) total_samples is 0 (unknown) and target_sample is 0 * 2) total_samples is 0 (unknown) and target_sample happens to be * exactly equal to the last seek point in the seek table; this * means there is no seek point above it, and upper_bound_samples * remains equal to the estimate (of target_samples) we made above * in either case it does not hurt to move upper_bound_sample up by 1 */ if(upper_bound_sample == lower_bound_sample) upper_bound_sample++; decoder->private_->target_sample = target_sample; while(1) { /* check if the bounds are still ok */ if (lower_bound_sample >= upper_bound_sample || lower_bound > upper_bound) { decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; return false; } #ifndef FLAC__INTEGER_ONLY_LIBRARY pos = (FLAC__int64)lower_bound + (FLAC__int64)((double)(target_sample - lower_bound_sample) / (double)(upper_bound_sample - lower_bound_sample) * (double)(upper_bound - lower_bound)) - approx_bytes_per_frame; #else /* a little less accurate: */ if(upper_bound - lower_bound < 0xffffffff) pos = (FLAC__int64)lower_bound + (FLAC__int64)(((target_sample - lower_bound_sample) * (upper_bound - lower_bound)) / (upper_bound_sample - lower_bound_sample)) - approx_bytes_per_frame; else { /* @@@ WATCHOUT, ~2TB limit */ FLAC__uint64 ratio = (1<<16) / (upper_bound_sample - lower_bound_sample); pos = (FLAC__int64)lower_bound + (FLAC__int64)((((target_sample - lower_bound_sample)>>8) * ((upper_bound - lower_bound)>>8) * ratio)) - approx_bytes_per_frame; } #endif if(pos >= (FLAC__int64)upper_bound) pos = (FLAC__int64)upper_bound - 1; if(pos < (FLAC__int64)lower_bound) pos = (FLAC__int64)lower_bound; if(decoder->private_->seek_callback(decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) { decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; return false; } if(!FLAC__stream_decoder_flush(decoder)) { /* above call sets the state for us */ return false; } /* Now we need to get a frame. First we need to reset our * unparseable_frame_count; if we get too many unparseable * frames in a row, the read callback will return * FLAC__STREAM_DECODER_READ_STATUS_ABORT, causing * FLAC__stream_decoder_process_single() to return false. */ decoder->private_->unparseable_frame_count = 0; if(!FLAC__stream_decoder_process_single(decoder) || decoder->protected_->state == FLAC__STREAM_DECODER_ABORTED) { decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; return false; } /* our write callback will change the state when it gets to the target frame */ /* actually, we could have got_a_frame if our decoder is at FLAC__STREAM_DECODER_END_OF_STREAM so we need to check for that also */ #if 0 /*@@@@@@ used to be the following; not clear if the check for end of stream is needed anymore */ if(decoder->protected_->state != FLAC__SEEKABLE_STREAM_DECODER_SEEKING && decoder->protected_->state != FLAC__STREAM_DECODER_END_OF_STREAM) break; #endif if(!decoder->private_->is_seeking) break; FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); this_frame_sample = decoder->private_->last_frame.header.number.sample_number; if (0 == decoder->private_->samples_decoded || (this_frame_sample + decoder->private_->last_frame.header.blocksize >= upper_bound_sample && !first_seek)) { if (pos == (FLAC__int64)lower_bound) { /* can't move back any more than the first frame, something is fatally wrong */ decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; return false; } /* our last move backwards wasn't big enough, try again */ approx_bytes_per_frame = approx_bytes_per_frame? approx_bytes_per_frame * 2 : 16; continue; } /* allow one seek over upper bound, so we can get a correct upper_bound_sample for streams with unknown total_samples */ first_seek = false; /* make sure we are not seeking in corrupted stream */ if (this_frame_sample < lower_bound_sample) { decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; return false; } /* we need to narrow the search */ if(target_sample < this_frame_sample) { upper_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize; /*@@@@@@ what will decode position be if at end of stream? */ if(!FLAC__stream_decoder_get_decode_position(decoder, &upper_bound)) { decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; return false; } approx_bytes_per_frame = (uint32_t)(2 * (upper_bound - pos) / 3 + 16); } else { /* target_sample >= this_frame_sample + this frame's blocksize */ lower_bound_sample = this_frame_sample + decoder->private_->last_frame.header.blocksize; if(!FLAC__stream_decoder_get_decode_position(decoder, &lower_bound)) { decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; return false; } approx_bytes_per_frame = (uint32_t)(2 * (lower_bound - pos) / 3 + 16); } } return true; } #if FLAC__HAS_OGG FLAC__bool seek_to_absolute_sample_ogg_(FLAC__StreamDecoder *decoder, FLAC__uint64 stream_length, FLAC__uint64 target_sample) { FLAC__uint64 left_pos = 0, right_pos = stream_length; FLAC__uint64 left_sample = 0, right_sample = FLAC__stream_decoder_get_total_samples(decoder); FLAC__uint64 this_frame_sample = (FLAC__uint64)0 - 1; FLAC__uint64 pos = 0; /* only initialized to avoid compiler warning */ FLAC__bool did_a_seek; uint32_t iteration = 0; /* In the first iterations, we will calculate the target byte position * by the distance from the target sample to left_sample and * right_sample (let's call it "proportional search"). After that, we * will switch to binary search. */ uint32_t BINARY_SEARCH_AFTER_ITERATION = 2; /* We will switch to a linear search once our current sample is less * than this number of samples ahead of the target sample */ static const FLAC__uint64 LINEAR_SEARCH_WITHIN_SAMPLES = FLAC__MAX_BLOCK_SIZE * 2; /* If the total number of samples is unknown, use a large value, and * force binary search immediately. */ if(right_sample == 0) { right_sample = (FLAC__uint64)(-1); BINARY_SEARCH_AFTER_ITERATION = 0; } decoder->private_->target_sample = target_sample; for( ; ; iteration++) { if (iteration == 0 || this_frame_sample > target_sample || target_sample - this_frame_sample > LINEAR_SEARCH_WITHIN_SAMPLES) { if (iteration >= BINARY_SEARCH_AFTER_ITERATION) { pos = (right_pos + left_pos) / 2; } else { #ifndef FLAC__INTEGER_ONLY_LIBRARY pos = (FLAC__uint64)((double)(target_sample - left_sample) / (double)(right_sample - left_sample) * (double)(right_pos - left_pos)); #else /* a little less accurate: */ if ((target_sample-left_sample <= 0xffffffff) && (right_pos-left_pos <= 0xffffffff)) pos = (FLAC__int64)(((target_sample-left_sample) * (right_pos-left_pos)) / (right_sample-left_sample)); else /* @@@ WATCHOUT, ~2TB limit */ pos = (FLAC__int64)((((target_sample-left_sample)>>8) * ((right_pos-left_pos)>>8)) / ((right_sample-left_sample)>>16)); #endif /* @@@ TODO: might want to limit pos to some distance * before EOF, to make sure we land before the last frame, * thereby getting a this_frame_sample and so having a better * estimate. */ } /* physical seek */ if(decoder->private_->seek_callback((FLAC__StreamDecoder*)decoder, (FLAC__uint64)pos, decoder->private_->client_data) != FLAC__STREAM_DECODER_SEEK_STATUS_OK) { decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; return false; } if(!FLAC__stream_decoder_flush(decoder)) { /* above call sets the state for us */ return false; } did_a_seek = true; } else did_a_seek = false; decoder->private_->got_a_frame = false; if(!FLAC__stream_decoder_process_single(decoder) || decoder->protected_->state == FLAC__STREAM_DECODER_ABORTED) { decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; return false; } if(!decoder->private_->got_a_frame) { if(did_a_seek) { /* this can happen if we seek to a point after the last frame; we drop * to binary search right away in this case to avoid any wasted * iterations of proportional search. */ right_pos = pos; BINARY_SEARCH_AFTER_ITERATION = 0; } else { /* this can probably only happen if total_samples is unknown and the * target_sample is past the end of the stream */ decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; return false; } } /* our write callback will change the state when it gets to the target frame */ else if(!decoder->private_->is_seeking) { break; } else { this_frame_sample = decoder->private_->last_frame.header.number.sample_number; FLAC__ASSERT(decoder->private_->last_frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER); if (did_a_seek) { if (this_frame_sample <= target_sample) { /* The 'equal' case should not happen, since * FLAC__stream_decoder_process_single() * should recognize that it has hit the * target sample and we would exit through * the 'break' above. */ FLAC__ASSERT(this_frame_sample != target_sample); left_sample = this_frame_sample; /* sanity check to avoid infinite loop */ if (left_pos == pos) { decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; return false; } left_pos = pos; } else { right_sample = this_frame_sample; /* sanity check to avoid infinite loop */ if (right_pos == pos) { decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; return false; } right_pos = pos; } } } } return true; } #endif FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], size_t *bytes, void *client_data) { (void)client_data; if(*bytes > 0) { *bytes = fread(buffer, sizeof(FLAC__byte), *bytes, decoder->private_->file); if(ferror(decoder->private_->file)) return FLAC__STREAM_DECODER_READ_STATUS_ABORT; else if(*bytes == 0) return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM; else return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE; } else return FLAC__STREAM_DECODER_READ_STATUS_ABORT; /* abort to avoid a deadlock */ } FLAC__StreamDecoderSeekStatus file_seek_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 absolute_byte_offset, void *client_data) { (void)client_data; if(decoder->private_->file == stdin) return FLAC__STREAM_DECODER_SEEK_STATUS_UNSUPPORTED; else if(fseeko(decoder->private_->file, (FLAC__off_t)absolute_byte_offset, SEEK_SET) < 0) return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR; else return FLAC__STREAM_DECODER_SEEK_STATUS_OK; } FLAC__StreamDecoderTellStatus file_tell_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *absolute_byte_offset, void *client_data) { FLAC__off_t pos; (void)client_data; if(decoder->private_->file == stdin) return FLAC__STREAM_DECODER_TELL_STATUS_UNSUPPORTED; else if((pos = ftello(decoder->private_->file)) < 0) return FLAC__STREAM_DECODER_TELL_STATUS_ERROR; else { *absolute_byte_offset = (FLAC__uint64)pos; return FLAC__STREAM_DECODER_TELL_STATUS_OK; } } FLAC__StreamDecoderLengthStatus file_length_callback_(const FLAC__StreamDecoder *decoder, FLAC__uint64 *stream_length, void *client_data) { struct flac_stat_s filestats; (void)client_data; if(decoder->private_->file == stdin) return FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED; else if(flac_fstat(fileno(decoder->private_->file), &filestats) != 0) return FLAC__STREAM_DECODER_LENGTH_STATUS_ERROR; else { *stream_length = (FLAC__uint64)filestats.st_size; return FLAC__STREAM_DECODER_LENGTH_STATUS_OK; } } FLAC__bool file_eof_callback_(const FLAC__StreamDecoder *decoder, void *client_data) { (void)client_data; return feof(decoder->private_->file)? true : false; } FLAC_API const void *FLAC__get_decoder_client_data(FLAC__StreamDecoder *decoder) { return decoder->private_->client_data; }

↑ V118 malloc() function accepts a dangerous expression in the capacity of an argument.

↑ V595 The 'block.data.vorbis_comment.comments' pointer was utilized before it was verified against nullptr. Check lines: 1523, 1524.

↑ V595 The 'block.data.cue_sheet.tracks' pointer was utilized before it was verified against nullptr. Check lines: 1531, 1532.

↑ V1037 Two or more case-branches perform the same actions. Check lines: 2893, 2899

↑ V1051 Consider checking for misprints. It's possible that the 'upper_bound_sample' should be used inside 'FLAC__stream_decoder_get_decode_position' function.

↑ V1051 Consider checking for misprints. It's possible that the 'lower_bound_sample' should be used inside 'FLAC__stream_decoder_get_decode_position' function.

↑ V1051 Consider checking for misprints. It's possible that the 'left_sample' should be checked here.

↑ V1051 Consider checking for misprints. It's possible that the 'right_sample' should be checked here.

↑ V526 The 'memcmp' function returns 0 if corresponding buffers are equal. Consider examining the condition for mistakes.

↑ V796 It is possible that 'break' statement is missing in switch statement.