| /* libFLAC - Free Lossless Audio Codec library |
| * Copyright (C) 2000,2001,2002,2003,2004,2005,2006 Josh Coalson |
| * |
| * 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. |
| */ |
| |
| #if HAVE_CONFIG_H |
| # include <config.h> |
| #endif |
| |
| #if defined _MSC_VER || defined __MINGW32__ |
| #include <io.h> /* for _setmode() */ |
| #include <fcntl.h> /* for _O_BINARY */ |
| #endif |
| #if defined __CYGWIN__ || defined __EMX__ |
| #include <io.h> /* for setmode(), O_BINARY */ |
| #include <fcntl.h> /* for _O_BINARY */ |
| #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 */ |
| #if defined _MSC_VER || defined __MINGW32__ |
| /*@@@ [2G limit] hacks for MSVC6 */ |
| #define fseeko fseek |
| #define ftello ftell |
| #endif |
| #include "FLAC/assert.h" |
| #include "protected/stream_decoder.h" |
| #include "private/bitbuffer.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" |
| |
| #ifdef max |
| #undef max |
| #endif |
| #define max(a,b) ((a)>(b)?(a):(b)) |
| |
| /* adjust for compilers that can't understand using LLU suffix for uint64_t literals */ |
| #ifdef _MSC_VER |
| #define FLAC__U64L(x) x |
| #else |
| #define FLAC__U64L(x) x##LLU |
| #endif |
| |
| /*********************************************************************** |
| * |
| * Private static data |
| * |
| ***********************************************************************/ |
| |
| static FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' }; |
| |
| /*********************************************************************** |
| * |
| * Private class method prototypes |
| * |
| ***********************************************************************/ |
| |
| static void set_defaults_(FLAC__StreamDecoder *decoder); |
| static FILE *get_binary_stdin_(); |
| static FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned 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, unsigned length); |
| static FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length); |
| static FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj); |
| static FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *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, unsigned channel, unsigned bps, FLAC__bool do_full_decode); |
| static FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode); |
| static FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode); |
| static FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode); |
| static FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode); |
| static FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, unsigned partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual); |
| static FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder); |
| static FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data); |
| 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); |
| static FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *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__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[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]); |
| /* generic 64-bit datapath: */ |
| void (*local_lpc_restore_signal_64bit)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned 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[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned 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), AND order <= 8: */ |
| void (*local_lpc_restore_signal_16bit_order8)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned 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__BitBuffer *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]; |
| unsigned output_capacity, output_channels; |
| FLAC__uint32 last_frame_number; |
| FLAC__uint32 last_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; |
| unsigned 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; |
| struct 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; |
| unsigned unparseable_frame_count; /* used to tell whether we're decoding a future version of FLAC or just got a bad sync */ |
| } 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_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_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() |
| { |
| FLAC__StreamDecoder *decoder; |
| unsigned i; |
| |
| FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */ |
| |
| decoder = (FLAC__StreamDecoder*)calloc(1, sizeof(FLAC__StreamDecoder)); |
| if(decoder == 0) { |
| return 0; |
| } |
| |
| decoder->protected_ = (FLAC__StreamDecoderProtected*)calloc(1, sizeof(FLAC__StreamDecoderProtected)); |
| if(decoder->protected_ == 0) { |
| free(decoder); |
| return 0; |
| } |
| |
| decoder->private_ = (FLAC__StreamDecoderPrivate*)calloc(1, sizeof(FLAC__StreamDecoderPrivate)); |
| if(decoder->private_ == 0) { |
| free(decoder->protected_); |
| free(decoder); |
| return 0; |
| } |
| |
| decoder->private_->input = FLAC__bitbuffer_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 = (FLAC__byte*)malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) { |
| FLAC__bitbuffer_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) |
| { |
| unsigned i; |
| |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != decoder->protected_); |
| FLAC__ASSERT(0 != decoder->private_); |
| FLAC__ASSERT(0 != decoder->private_->input); |
| |
| FLAC__stream_decoder_finish(decoder); |
| |
| if(0 != decoder->private_->metadata_filter_ids) |
| free(decoder->private_->metadata_filter_ids); |
| |
| FLAC__bitbuffer_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 |
| * |
| ***********************************************************************/ |
| |
| 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 |
| ) |
| { |
| FLAC__ASSERT(0 != decoder); |
| |
| if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) |
| return FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED; |
| |
| 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; |
| |
| /* |
| * 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; |
| decoder->private_->local_lpc_restore_signal_16bit_order8 = 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 |
| if(decoder->private_->cpuinfo.data.ia32.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; |
| decoder->private_->local_lpc_restore_signal_16bit_order8 = 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; |
| decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal_asm_ia32; |
| } |
| #endif |
| #elif defined FLAC__CPU_PPC |
| FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_PPC); |
| if(decoder->private_->cpuinfo.data.ppc.altivec) { |
| decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ppc_altivec_16; |
| decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal_asm_ppc_altivec_16_order8; |
| } |
| #endif |
| } |
| #endif |
| |
| /* from here on, errors are fatal */ |
| |
| if(!FLAC__bitbuffer_init(decoder->private_->input)) { |
| 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_->last_frame_number = 0; |
| decoder->private_->last_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_FILE( |
| FLAC__StreamDecoder *decoder, |
| FILE *file, |
| FLAC__StreamDecoderWriteCallback write_callback, |
| FLAC__StreamDecoderMetadataCallback metadata_callback, |
| FLAC__StreamDecoderErrorCallback error_callback, |
| void *client_data |
| ) |
| { |
| FLAC__ASSERT(0 != decoder); |
| FLAC__ASSERT(0 != file); |
| |
| if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED) |
| return decoder->protected_->state = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED; |
| |
| if(0 == write_callback || 0 == error_callback) |
| return decoder->protected_->state = 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 FLAC__stream_decoder_init_stream( |
| decoder, |
| file_read_callback_, |
| decoder->private_->file == stdin? 0: file_seek_callback_, |
| decoder->private_->file == stdin? 0: file_tell_callback_,/*@@@@@@ might work for stdin*/ |
| decoder->private_->file == stdin? 0: file_length_callback_, |
| decoder->private_->file == stdin? 0: file_eof_callback_,/*@@@@@@ might work for stdin*/ |
| write_callback, |
| metadata_callback, |
| error_callback, |
| client_data |
| ); |
| } |
| |
| 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 |
| ) |
| { |
| 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_->state = FLAC__STREAM_DECODER_INIT_STATUS_ALREADY_INITIALIZED; |
| |
| if(0 == write_callback || 0 == error_callback) |
| return decoder->protected_->state = FLAC__STREAM_DECODER_INIT_STATUS_INVALID_CALLBACKS; |
| |
| file = filename? fopen(filename, "rb") : stdin; |
| |
| if(0 == file) |
| return FLAC__STREAM_DECODER_INIT_STATUS_ERROR_OPENING_FILE; |
| |
| return FLAC__stream_decoder_init_FILE(decoder, file, write_callback, metadata_callback, error_callback, client_data); |
| } |
| |
| FLAC_API FLAC__bool FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder) |
| { |
| FLAC__bool md5_failed = false; |
| unsigned 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__seekable_stream_decoder_reset() as to why we |
| * always call FLAC__MD5Final() |
| */ |
| FLAC__MD5Final(decoder->private_->computed_md5sum, &decoder->private_->md5context); |
| |
| if(decoder->private_->has_seek_table && 0 != decoder->private_->seek_table.data.seek_table.points) { |
| 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__bitbuffer_free(decoder->private_->input); |
| for(i = 0; i < FLAC__MAX_CHANNELS; i++) { |
| /* WATCHOUT: |
| * FLAC__lpc_restore_signal_asm_ia32_mmx() requires 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(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_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((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE); |
| /* double protection */ |
| if((unsigned)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 = (FLAC__byte*)realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 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) |
| { |
| unsigned 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((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE); |
| /* double protection */ |
| if((unsigned)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 = (FLAC__byte*)realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 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 unsigned 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 unsigned 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 unsigned 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 unsigned 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(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; |
| 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_); |
| |
| decoder->private_->samples_decoded = 0; |
| decoder->private_->do_md5_checking = false; |
| |
| if(!FLAC__bitbuffer_clear(decoder->private_->input)) { |
| decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; |
| return false; |
| } |
| decoder->private_->last_frame_number = 0; |
| decoder->private_->last_block_size = 0; |
| 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; |
| } |
| |
| /* 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; |
| if(decoder->private_->has_seek_table && 0 != decoder->private_->seek_table.data.seek_table.points) { |
| 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; |
| |
| /* 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__seekable_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; |
| } |
| } |
| |
| { |
| FLAC__bool ok = seek_to_absolute_sample_(decoder, length, sample); |
| decoder->private_->is_seeking = false; |
| return ok; |
| } |
| } |
| |
| /*********************************************************************** |
| * |
| * Protected class methods |
| * |
| ***********************************************************************/ |
| |
| unsigned FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder) |
| { |
| FLAC__ASSERT(0 != decoder); |
| return FLAC__bitbuffer_get_input_bytes_unconsumed(decoder->private_->input); |
| } |
| |
| /*********************************************************************** |
| * |
| * Private class methods |
| * |
| ***********************************************************************/ |
| |
| void set_defaults_(FLAC__StreamDecoder *decoder) |
| { |
| 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; |
| } |
| |
| /* |
| * This will forcibly set stdin to binary mode (for OSes that require it) |
| */ |
| FILE *get_binary_stdin_() |
| { |
| /* 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 __CYGWIN__ || defined __EMX__ |
| /* almost certainly not needed for any modern Cygwin, but let's be safe... */ |
| setmode(_fileno(stdin), _O_BINARY); |
| #endif |
| |
| return stdin; |
| } |
| |
| FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels) |
| { |
| unsigned 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() requires 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 = (FLAC__int32*)malloc(sizeof(FLAC__int32)*(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; |
| |
| /* WATCHOUT: |
| * minimum of quadword alignment for PPC vector optimizations is REQUIRED: |
| */ |
| 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) |
| { |
| unsigned 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; |
| unsigned i, id; |
| FLAC__bool first = true; |
| |
| FLAC__ASSERT(FLAC__bitbuffer_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__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| } |
| if(x == FLAC__STREAM_SYNC_STRING[i]) { |
| first = true; |
| i++; |
| id = 0; |
| continue; |
| } |
| 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; |
| } |
| if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */ |
| decoder->private_->header_warmup[0] = (FLAC__byte)x; |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder)) |
| 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 >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */ |
| 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__bitbuffer_is_consumed_byte_aligned(decoder->private_->input)); |
| |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_IS_LAST_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| is_last = x? true : false; |
| |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN, read_callback_, decoder)) |
| 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) { |
| 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]; |
| unsigned real_length = length; |
| FLAC__StreamMetadata block; |
| |
| block.is_last = is_last; |
| block.type = (FLAC__MetadataType)type; |
| block.length = length; |
| |
| if(type == FLAC__METADATA_TYPE_APPLICATION) { |
| if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| |
| 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__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, 0, real_length, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| } |
| else { |
| switch(type) { |
| case FLAC__METADATA_TYPE_PADDING: |
| /* skip the padding bytes */ |
| if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, 0, real_length, read_callback_, decoder)) |
| return 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 = (FLAC__byte*)malloc(real_length))) { |
| decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; |
| return false; |
| } |
| if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.data, real_length, read_callback_, decoder)) |
| return 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)) |
| return false; |
| break; |
| case FLAC__METADATA_TYPE_CUESHEET: |
| if(!read_metadata_cuesheet_(decoder, &block.data.cue_sheet)) |
| return 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 = (FLAC__byte*)malloc(real_length))) { |
| decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; |
| return false; |
| } |
| if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.unknown.data, real_length, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| } |
| else |
| block.data.unknown.data = 0; |
| break; |
| } |
| if(!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_STREAMINFO: |
| case FLAC__METADATA_TYPE_SEEKTABLE: |
| FLAC__ASSERT(0); |
| default: |
| if(0 != block.data.unknown.data) |
| free(block.data.unknown.data); |
| break; |
| } |
| } |
| } |
| |
| 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, unsigned length) |
| { |
| FLAC__uint32 x; |
| unsigned bits, used_bits = 0; |
| |
| FLAC__ASSERT(FLAC__bitbuffer_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__bitbuffer_read_raw_uint32(decoder->private_->input, &x, bits, read_callback_, decoder)) |
| 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__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN, read_callback_, decoder)) |
| 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__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN, read_callback_, decoder)) |
| 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__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN, read_callback_, decoder)) |
| 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__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN, read_callback_, decoder)) |
| 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__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN, read_callback_, decoder)) |
| 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__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN, read_callback_, decoder)) |
| 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__bitbuffer_read_raw_uint64(decoder->private_->input, &decoder->private_->stream_info.data.stream_info.total_samples, FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| used_bits += bits; |
| |
| if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16, read_callback_, decoder)) |
| 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); |
| length -= (used_bits / 8); |
| if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, 0, length, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| |
| return true; |
| } |
| |
| FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length) |
| { |
| FLAC__uint32 i, x; |
| FLAC__uint64 xx; |
| |
| FLAC__ASSERT(FLAC__bitbuffer_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 = (FLAC__StreamMetadata_SeekPoint*)realloc(decoder->private_->seek_table.data.seek_table.points, decoder->private_->seek_table.data.seek_table.num_points * 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__bitbuffer_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx; |
| |
| if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx; |
| |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN, read_callback_, decoder)) |
| 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 an error_callback() here? there's an argument for either way */ |
| if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, 0, length, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| } |
| |
| return true; |
| } |
| |
| FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj) |
| { |
| FLAC__uint32 i; |
| |
| FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input)); |
| |
| /* read vendor string */ |
| FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32); |
| if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &obj->vendor_string.length, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| if(obj->vendor_string.length > 0) { |
| if(0 == (obj->vendor_string.entry = (FLAC__byte*)malloc(obj->vendor_string.length+1))) { |
| decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; |
| return false; |
| } |
| if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, obj->vendor_string.entry, obj->vendor_string.length, read_callback_, decoder)) |
| 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__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &obj->num_comments, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| |
| /* read comments */ |
| if(obj->num_comments > 0) { |
| if(0 == (obj->comments = (FLAC__StreamMetadata_VorbisComment_Entry*)malloc(obj->num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) { |
| decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; |
| return false; |
| } |
| for(i = 0; i < obj->num_comments; i++) { |
| FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32); |
| if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &obj->comments[i].length, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| if(obj->comments[i].length > 0) { |
| if(0 == (obj->comments[i].entry = (FLAC__byte*)malloc(obj->comments[i].length+1))) { |
| decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; |
| return false; |
| } |
| if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, obj->comments[i].entry, obj->comments[i].length, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| obj->comments[i].entry[obj->comments[i].length] = '\0'; |
| } |
| else |
| obj->comments[i].entry = 0; |
| } |
| } |
| else { |
| obj->comments = 0; |
| } |
| |
| return true; |
| } |
| |
| FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj) |
| { |
| FLAC__uint32 i, j, x; |
| |
| FLAC__ASSERT(FLAC__bitbuffer_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__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->media_catalog_number, FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN/8, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| |
| if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &obj->lead_in, FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| obj->is_cd = x? true : false; |
| |
| if(!FLAC__bitbuffer_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| obj->num_tracks = x; |
| |
| if(obj->num_tracks > 0) { |
| if(0 == (obj->tracks = (FLAC__StreamMetadata_CueSheet_Track*)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__bitbuffer_read_raw_uint64(decoder->private_->input, &track->offset, FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN, read_callback_, decoder)) |
| 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__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)track->isrc, FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN/8, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| track->type = x; |
| |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| track->pre_emphasis = x; |
| |
| if(!FLAC__bitbuffer_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| track->num_indices = (FLAC__byte)x; |
| |
| if(track->num_indices > 0) { |
| if(0 == (track->indices = (FLAC__StreamMetadata_CueSheet_Index*)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 *index = &track->indices[j]; |
| if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &index->offset, FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| index->number = (FLAC__byte)x; |
| |
| if(!FLAC__bitbuffer_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| } |
| } |
| } |
| } |
| |
| return true; |
| } |
| |
| FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder) |
| { |
| FLAC__uint32 x; |
| unsigned i, skip; |
| |
| /* skip the version and flags bytes */ |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 24, read_callback_, decoder)) |
| 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__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| skip <<= 7; |
| skip |= (x & 0x7f); |
| } |
| /* skip the rest of the tag */ |
| if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, 0, skip, read_callback_, decoder)) |
| 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__bitbuffer_is_consumed_byte_aligned(decoder->private_->input)) { |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__bitbuffer_bits_left_for_byte_alignment(decoder->private_->input), read_callback_, decoder)) |
| 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__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder)) |
| 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__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder)) |
| 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 >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */ |
| 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) |
| { |
| unsigned channel; |
| unsigned i; |
| FLAC__int32 mid, side, left, right; |
| FLAC__uint16 frame_crc; /* the one we calculate from the input stream */ |
| FLAC__uint32 x; |
| |
| *got_a_frame = false; |
| |
| /* init the CRC */ |
| frame_crc = 0; |
| FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc); |
| FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc); |
| FLAC__bitbuffer_reset_read_crc16(decoder->private_->input, 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 |
| */ |
| unsigned 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; |
| |
| /* |
| * Read the frame CRC-16 from the footer and check |
| */ |
| frame_crc = FLAC__bitbuffer_get_read_crc16(decoder->private_->input); |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| if(frame_crc == (FLAC__uint16)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++) { |
| mid = decoder->private_->output[0][i]; |
| side = decoder->private_->output[1][i]; |
| mid <<= 1; |
| if(side & 1) /* i.e. if 'side' is odd... */ |
| mid++; |
| left = mid + side; |
| right = mid - side; |
| decoder->private_->output[0][i] = left >> 1; |
| decoder->private_->output[1][i] = right >> 1; |
| } |
| 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; |
| |
| /* 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) |
| 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; |
| unsigned 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 */ |
| unsigned raw_header_len; |
| FLAC__bool is_unparseable = false; |
| const FLAC__bool is_known_variable_blocksize_stream = (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize != decoder->private_->stream_info.data.stream_info.max_blocksize); |
| const FLAC__bool is_known_fixed_blocksize_stream = (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize == decoder->private_->stream_info.data.stream_info.max_blocksize); |
| |
| FLAC__ASSERT(FLAC__bitbuffer_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 the reserved bits are 0 |
| */ |
| if(raw_header[1] & 0x03) { /* 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. |
| */ |
| |
| /* |
| * 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__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder)) |
| 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: |
| if(is_known_fixed_blocksize_stream) |
| decoder->private_->frame.header.blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize; |
| else |
| 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: |
| case 2: |
| case 3: |
| is_unparseable = true; |
| 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 = (unsigned)(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 = (unsigned)x + 1; |
| decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT; |
| } |
| |
| switch(x = (unsigned)(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; |
| } |
| |
| if(raw_header[3] & 0x01) { /* this should be a zero padding bit */ |
| send_error_to_client_(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER); |
| decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; |
| return true; |
| } |
| |
| /* |
| * Now we get to the regrettable consequences of not knowing for sure |
| * whether we got a frame number or a sample number. There are no |
| * encoders that do variable-blocksize encoding so unless we know from |
| * the STREAMINFO that it is variable-blocksize we will assume it is |
| * fixed-blocksize. The trouble comes when we have no STREAMINFO; again |
| * we will guess that is fixed-blocksize. Where this can go wrong: 1) a |
| * variable-blocksize stream with no STREAMINFO; 2) a fixed-blocksize |
| * stream that was edited such that one or more frames before or |
| * including this one do not have the same number of samples as the |
| * STREAMINFO's min and max blocksize. |
| */ |
| if(is_known_variable_blocksize_stream) { |
| if(blocksize_hint) { |
| if(!FLAC__bitbuffer_read_utf8_uint64(decoder->private_->input, &xx, read_callback_, decoder, 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 |
| is_unparseable = true; |
| } |
| else { |
| if(!FLAC__bitbuffer_read_utf8_uint32(decoder->private_->input, &x, read_callback_, decoder, 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_->last_frame_number = x; |
| decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER; |
| if(decoder->private_->has_stream_info) { |
| FLAC__ASSERT(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_->last_block_size = decoder->private_->frame.header.blocksize; |
| } |
| else if(blocksize_hint) { |
| if(decoder->private_->last_block_size) |
| decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->last_block_size * (FLAC__uint64)x; |
| else |
| is_unparseable = true; |
| } |
| else { |
| decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->frame.header.blocksize * (FLAC__uint64)x; |
| decoder->private_->last_block_size = decoder->private_->frame.header.blocksize; |
| } |
| } |
| |
| if(blocksize_hint) { |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder)) |
| 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__bitbuffer_read_raw_uint32(decoder->private_->input, &_x, 8, read_callback_, decoder)) |
| 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__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder)) |
| 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__bitbuffer_read_raw_uint32(decoder->private_->input, &_x, 8, read_callback_, decoder)) |
| 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__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder)) |
| 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; |
| } |
| |
| 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, unsigned channel, unsigned bps, FLAC__bool do_full_decode) |
| { |
| FLAC__uint32 x; |
| FLAC__bool wasted_bits; |
| unsigned i; |
| |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder)) /* MAGIC NUMBER */ |
| return false; /* read_callback_ sets the state for us */ |
| |
| wasted_bits = (x & 1); |
| x &= 0xfe; |
| |
| if(wasted_bits) { |
| unsigned u; |
| if(!FLAC__bitbuffer_read_unary_unsigned(decoder->private_->input, &u, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| decoder->private_->frame.subframes[channel].wasted_bits = u+1; |
| 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++) |
| decoder->private_->output[channel][i] <<= x; |
| } |
| |
| return true; |
| } |
| |
| FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode) |
| { |
| FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant; |
| FLAC__int32 x; |
| unsigned i; |
| FLAC__int32 *output = decoder->private_->output[channel]; |
| |
| decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT; |
| |
| if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &x, bps, read_callback_, decoder)) |
| 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, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode) |
| { |
| FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed; |
| FLAC__int32 i32; |
| FLAC__uint32 u32; |
| unsigned 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__bitbuffer_read_raw_int32(decoder->private_->input, &i32, bps, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| subframe->warmup[u] = i32; |
| } |
| |
| /* read entropy coding method info */ |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder)) |
| 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: |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| 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: |
| 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])) |
| 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, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode) |
| { |
| FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc; |
| FLAC__int32 i32; |
| FLAC__uint32 u32; |
| unsigned 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__bitbuffer_read_raw_int32(decoder->private_->input, &i32, bps, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| subframe->warmup[u] = i32; |
| } |
| |
| /* read qlp coeff precision */ |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN, read_callback_, decoder)) |
| 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__bitbuffer_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| subframe->quantization_level = i32; |
| |
| /* read quantized lp coefficiencts */ |
| for(u = 0; u < order; u++) { |
| if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| subframe->qlp_coeff[u] = i32; |
| } |
| |
| /* read entropy coding method info */ |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder)) |
| 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: |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| 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: |
| 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])) |
| 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) { |
| if(order <= 8) |
| decoder->private_->local_lpc_restore_signal_16bit_order8(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_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, unsigned channel, unsigned 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]; |
| unsigned 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__bitbuffer_read_raw_int32(decoder->private_->input, &x, bps, read_callback_, decoder)) |
| 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, unsigned predictor_order, unsigned partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual) |
| { |
| FLAC__uint32 rice_parameter; |
| int i; |
| unsigned partition, sample, u; |
| const unsigned partitions = 1u << partition_order; |
| const unsigned partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order; |
| |
| /* sanity checks */ |
| if(partition_order == 0) { |
| if(decoder->private_->frame.header.blocksize < predictor_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; |
| } |
| } |
| else { |
| if(partition_samples < predictor_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; |
| } |
| } |
| |
| if(!FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, max(6, partition_order))) { |
| decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR; |
| return false; |
| } |
| |
| sample = 0; |
| for(partition = 0; partition < partitions; partition++) { |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| partitioned_rice_contents->parameters[partition] = rice_parameter; |
| if(rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) { |
| u = (partition_order == 0 || partition > 0)? partition_samples : partition_samples - predictor_order; |
| if(!FLAC__bitbuffer_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| sample += u; |
| } |
| else { |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| partitioned_rice_contents->raw_bits[partition] = rice_parameter; |
| for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) { |
| if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i, rice_parameter, read_callback_, decoder)) |
| return false; /* read_callback_ sets the state for us */ |
| residual[sample] = i; |
| } |
| } |
| } |
| |
| return true; |
| } |
| |
| FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder) |
| { |
| if(!FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input)) { |
| FLAC__uint32 zero = 0; |
| if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitbuffer_bits_left_for_byte_alignment(decoder->private_->input), read_callback_, decoder)) |
| 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[], unsigned *bytes, void *client_data) |
| { |
| FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data; |
| |
| if(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 = 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 || (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; |
| } |
| } |
| |
| 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); |
| |
| decoder->private_->last_frame = *frame; /* save the frame */ |
| if(this_frame_sample <= target_sample && target_sample < next_frame_sample) { /* we hit our target frame */ |
| unsigned delta = (unsigned)(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) { |
| unsigned 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; |
| FLAC__int64 pos = -1, last_pos = -1; |
| int i, lower_seek_point = -1, upper_seek_point = -1; |
| unsigned approx_bytes_per_frame; |
| FLAC__uint64 last_frame_sample = FLAC__U64L(0xffffffffffffffff); |
| FLAC__bool needs_seek; |
| const FLAC__uint64 total_samples = FLAC__stream_decoder_get_total_samples(decoder); |
| const unsigned min_blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize; |
| const unsigned max_blocksize = decoder->private_->stream_info.data.stream_info.max_blocksize; |
| const unsigned max_framesize = decoder->private_->stream_info.data.stream_info.max_framesize; |
| const unsigned channels = FLAC__stream_decoder_get_channels(decoder); |
| const unsigned 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; |
| |
| /* we are just guessing here, but we want to guess high, not low */ |
| if(max_framesize > 0) |
| approx_bytes_per_frame = max_framesize; |
| |
| /* |
| * 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 calulation */ |
| approx_bytes_per_frame = min_blocksize * channels * bps/8 + 64; |
| } |
| else |
| approx_bytes_per_frame = 4608 * channels * bps/8 + 64; |
| |
| /* |
| * First, we set an upper and lower bound on where in the |
| * stream we will search. For now we assume the worst case |
| * scenario, which is our best guess at the beginning of |
| * the first and last frames. |
| */ |
| lower_bound = first_frame_offset; |
| |
| /* calc the upper_bound, beyond which we never want to seek */ |
| if(max_framesize > 0) |
| upper_bound = stream_length - (max_framesize + 128 + 2); /* 128 for a possible ID3V1 tag, 2 for indexing differences */ |
| else |
| upper_bound = stream_length - ((channels * bps * FLAC__MAX_BLOCK_SIZE) / 8 + 128 + 2); |
| |
| /* |
| * 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. |
| */ |
| if(seek_table) { |
| /* 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].sample_number <= target_sample) |
| break; |
| } |
| if(i >= 0) { /* i.e. we found a suitable seek point... */ |
| lower_bound = first_frame_offset + seek_table->points[i].stream_offset; |
| lower_seek_point = i; |
| } |
| |
| /* 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].sample_number > target_sample) |
| break; |
| } |
| if(i < (int)seek_table->num_points) { /* i.e. we found a suitable seek point... */ |
| upper_bound = first_frame_offset + seek_table->points[i].stream_offset; |
| upper_seek_point = i; |
| } |
| } |
| |
| /* |
| * Now guess at where within those bounds our target |
| * sample will be. |
| */ |
| if(seek_table && lower_seek_point >= 0) { |
| /* first see if our sample is within a few frames of the lower seekpoint */ |
| if(seek_table->points[lower_seek_point].sample_number <= target_sample && target_sample < seek_table->points[lower_seek_point].sample_number + (seek_table->points[lower_seek_point].frame_samples * 4)) { |
| pos = (FLAC__int64)lower_bound; |
| } |
| else if(upper_seek_point >= 0) { |
| const FLAC__uint64 target_offset = target_sample - seek_table->points[lower_seek_point].sample_number; |
| const FLAC__uint64 range_samples = seek_table->points[upper_seek_point].sample_number - seek_table->points[lower_seek_point].sample_number; |
| const FLAC__uint64 range_bytes = (upper_bound>lower_bound? upper_bound - lower_bound - 1 : 0); |
| #ifndef FLAC__INTEGER_ONLY_LIBRARY |
| #if defined _MSC_VER || defined __MINGW32__ |
| /* with MSVC you have to spoon feed it the casting */ |
| pos = (FLAC__int64)lower_bound + (FLAC__int64)(((FLAC__double)(FLAC__int64)target_offset / (FLAC__double)(FLAC__int64)range_samples) * (FLAC__double)(FLAC__int64)(range_bytes-1)) - approx_bytes_per_frame; |
| #else |
| pos = (FLAC__int64)lower_bound + (FLAC__int64)(((FLAC__double)target_offset / (FLAC__double)range_samples) * (FLAC__double)range_bytes) - approx_bytes_per_frame; |
| #endif |
| #else |
| /* a little less accurate: */ |
| if (range_bytes <= 0xffffffff) |
| pos = (FLAC__int64)lower_bound + (FLAC__int64)((target_offset * range_bytes) / range_samples) - approx_bytes_per_frame; |
| else /* @@@ WATCHOUT, ~2TB limit */ |
| pos = (FLAC__int64)lower_bound + (FLAC__int64)(((target_offset>>8) * (range_bytes>>8)) / (range_samples>>16)) - approx_bytes_per_frame; |
| #endif |
| } |
| } |
| |
| /* |
| * If there's no seek table, we need to use the metadata (if we |
| * have it) and the filelength to estimate the position of the |
| * frame with the correct sample. |
| */ |
| if(pos < 0 && total_samples > 0) { |
| /* |
| * For max accuracy we should be using |
| * (stream_length-first_frame_offset-1) in the divisor, but the |
| * difference is trivial and (stream_length-first_frame_offset) |
| * has no chance of underflow. |
| */ |
| #ifndef FLAC__INTEGER_ONLY_LIBRARY |
| #if defined _MSC_VER || defined __MINGW32__ |
| /* with VC++ you have to spoon feed it the casting */ |
| pos = (FLAC__int64)first_frame_offset + (FLAC__int64)(((FLAC__double)(FLAC__int64)target_sample / (FLAC__double)(FLAC__int64)total_samples) * (FLAC__double)(FLAC__int64)(stream_length-first_frame_offset)) - approx_bytes_per_frame; |
| #else |
| pos = (FLAC__int64)first_frame_offset + (FLAC__int64)(((FLAC__double)target_sample / (FLAC__double)total_samples) * (FLAC__double)(stream_length-first_frame_offset)) - approx_bytes_per_frame; |
| #endif |
| #else |
| /* a little less accurate: */ |
| if (stream_length < 0xffffffff) |
| pos = (FLAC__int64)first_frame_offset + (FLAC__int64)((target_sample * (stream_length-first_frame_offset)) / total_samples) - approx_bytes_per_frame; |
| else /* @@@ WATCHOUT, ~2TB limit */ |
| pos = (FLAC__int64)first_frame_offset + (FLAC__int64)(((target_sample>>8) * ((stream_length-first_frame_offset)>>8)) / (total_samples>>16)) - approx_bytes_per_frame; |
| #endif |
| } |
| |
| /* |
| * If there's no seek table and total_samples is unknown, we |
| * don't even bother trying to figure out a target, we just use |
| * our current position. |
| */ |
| if(pos < 0) { |
| FLAC__uint64 upos; |
| if(decoder->private_->tell_callback(decoder, &upos, decoder->private_->client_data) != FLAC__STREAM_DECODER_TELL_STATUS_OK) { |
| decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; |
| return false; |
| } |
| pos = (FLAC__int64)upos; |
| needs_seek = false; |
| } |
| else |
| needs_seek = true; |
| |
| /* clip the position to the bounds, lower bound takes precedence */ |
| if(pos >= (FLAC__int64)upper_bound) { |
| pos = (FLAC__int64)upper_bound-1; |
| needs_seek = true; |
| } |
| if(pos < (FLAC__int64)lower_bound) { |
| pos = (FLAC__int64)lower_bound; |
| needs_seek = true; |
| } |
| |
| decoder->private_->target_sample = target_sample; |
| while(1) { |
| if(needs_seek) { |
| 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_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; |
| } |
| else { /* we need to narrow the search */ |
| const FLAC__uint64 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(this_frame_sample == last_frame_sample && pos < last_pos) { |
| /* our last move backwards wasn't big enough, double it */ |
| pos -= (last_pos - pos); |
| needs_seek = true; |
| } |
| else { |
| if(target_sample < this_frame_sample) { |
| last_pos = pos; |
| approx_bytes_per_frame = decoder->private_->last_frame.header.blocksize * channels * bps/8 + 64; |
| pos -= approx_bytes_per_frame; |
| needs_seek = true; |
| } |
| else { /* target_sample >= this_frame_sample + this frame's blocksize */ |
| FLAC__uint64 upos; |
| if(decoder->private_->tell_callback(decoder, &upos, decoder->private_->client_data) != FLAC__STREAM_DECODER_TELL_STATUS_OK) { |
| decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; |
| return false; |
| } |
| last_pos = pos; |
| pos = (FLAC__int64)upos; |
| pos -= FLAC__stream_decoder_get_input_bytes_unconsumed(decoder); |
| needs_seek = false; |
| /* |
| * if we haven't hit the target frame yet and our position hasn't changed, |
| * it means we're at the end of the stream and the seek target does not exist. |
| */ |
| if(last_pos == pos) { |
| decoder->protected_->state = FLAC__STREAM_DECODER_SEEK_ERROR; |
| return false; |
| } |
| } |
| } |
| if(pos < (FLAC__int64)lower_bound) |
| pos = (FLAC__int64)lower_bound; |
| last_frame_sample = this_frame_sample; |
| } |
| } |
| |
| return true; |
| } |
| |
| FLAC__StreamDecoderReadStatus file_read_callback_(const FLAC__StreamDecoder *decoder, FLAC__byte buffer[], unsigned *bytes, void *client_data) |
| { |
| (void)client_data; |
| |
| if(*bytes > 0) { |
| *bytes = (unsigned)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, (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) |
| { |
| off_t pos; |
| (void)client_data; |
| |
| if(decoder->private_->file == stdin) /*@@@@@@ may work for 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 stat filestats; |
| (void)client_data; |
| |
| if(decoder->private_->file == stdin) |
| return FLAC__STREAM_DECODER_LENGTH_STATUS_UNSUPPORTED; |
| else if(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; |
| |
| if(decoder->private_->file == stdin) /*@@@@@@ feof() may work for stdin */ |
| return false; |
| return feof(decoder->private_->file)? true : false; |
| } |