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Diffstat (limited to '')
| -rw-r--r-- | src/flac_decode.c | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/src/flac_decode.c b/src/flac_decode.c new file mode 100644 index 000000000..5f7ac428f --- /dev/null +++ b/src/flac_decode.c @@ -0,0 +1,292 @@ +/* the Music Player Daemon (MPD) + * (c)2003-2004 by Warren Dukes (shank@mercury.chem.pitt.edu) + * This project's homepage is: http://www.musicpd.org + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#ifdef HAVE_FLAC +#include "flac_decode.h" + +#include "utils.h" +#include "log.h" +#include "pcm_utils.h" + +#include <stdio.h> +#include <string.h> +#include <unistd.h> +#include <FLAC/file_decoder.h> +#include <FLAC/metadata.h> + +typedef struct { + unsigned char chunk[CHUNK_SIZE]; + int chunk_length; + float time; + Buffer * cb; + AudioFormat * af; + DecoderControl * dc; + char * file; +} FlacData; + +/* this code is based on flac123, from flac-tools */ + +int flacSendChunk(FlacData * data); +void flacPlayfile(const char * file, Buffer * cb, ao_sample_format * format); +void flacError(const FLAC__FileDecoder *, FLAC__StreamDecoderErrorStatus, void *); +void flacPrintErroredState(FLAC__FileDecoderState state, char * file); +void flacMetadata(const FLAC__FileDecoder *, const FLAC__StreamMetadata *, void *); +FLAC__StreamDecoderWriteStatus flacWrite(const FLAC__FileDecoder *, const FLAC__Frame *, const FLAC__int32 * const buf[], void *); + +void flacPlayFile(char *file, Buffer * cb, AudioFormat * af, + DecoderControl *dc) +{ + FLAC__FileDecoder * flacDec; + FlacData data; + int status = 1; + + data.chunk_length = 0; + data.time = 0; + data.cb = cb; + data.af = af; + data.dc = dc; + data.file = file; + + if(!(flacDec = FLAC__file_decoder_new())) return; + /*status&=FLAC__file_decoder_set_md5_checking(flacDec,1);*/ + status&=FLAC__file_decoder_set_filename(flacDec,file); + status&=FLAC__file_decoder_set_write_callback(flacDec,flacWrite); + status&=FLAC__file_decoder_set_metadata_callback(flacDec,flacMetadata); + status&=FLAC__file_decoder_set_error_callback(flacDec,flacError); + status&=FLAC__file_decoder_set_client_data(flacDec, (void *)&data); + if(!status) { + ERROR("flac problem before init(): %s\n",file); + flacPrintErroredState(FLAC__file_decoder_get_state(flacDec),file); + FLAC__file_decoder_delete(flacDec); + return; + } + if(FLAC__file_decoder_init(flacDec)!= + FLAC__STREAM_DECODER_SEARCH_FOR_METADATA) + { + ERROR("flac problem doing init(): %s\n",file); + flacPrintErroredState(FLAC__file_decoder_get_state(flacDec),file); + FLAC__file_decoder_delete(flacDec); + return; + } + if(!FLAC__file_decoder_process_until_end_of_metadata(flacDec)) { + ERROR("flac problem reading metadata: %s\n",file); + flacPrintErroredState(FLAC__file_decoder_get_state(flacDec),file); + FLAC__file_decoder_delete(flacDec); + return; + } + while(1) { + FLAC__file_decoder_process_single(flacDec); + if(FLAC__file_decoder_get_state(flacDec)!= + FLAC__FILE_DECODER_OK) + { + break; + } + if(dc->seek) { + FLAC__uint64 sampleToSeek = dc->seekWhere* + af->sampleRate+0.5; + cb->end = 0; + cb->wrap = 0; + if(FLAC__file_decoder_seek_absolute(flacDec, + sampleToSeek)) + { + data.time = ((float)sampleToSeek)/ + af->sampleRate; + } + dc->seek = 0; + } + } + FLAC__file_decoder_process_until_end_of_file(flacDec); + if(!dc->stop) { + flacPrintErroredState(FLAC__file_decoder_get_state(flacDec), + file); + FLAC__file_decoder_finish(flacDec); + } + FLAC__file_decoder_delete(flacDec); + /* send last little bit */ + if(data.chunk_length>0 && !dc->stop) flacSendChunk(&data); +} + +void flacError(const FLAC__FileDecoder *dec, FLAC__StreamDecoderErrorStatus status, void *fdata) { + FlacData * data = (FlacData *) fdata; + if(data->dc->stop) return; + + switch(status) { + case FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC: + ERROR("flac lost sync: %s\n",data->file); + break; + case FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER: + ERROR("bad header %s\n",data->file); + break; + case FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH: + ERROR("crc mismatch %s\n",data->file); + break; + default: + ERROR("unknow flac error %s\n",data->file); + } +} + +void flacPrintErroredState(FLAC__FileDecoderState state, char * file) { + switch(state) { + case FLAC__FILE_DECODER_ERROR_OPENING_FILE: + ERROR("error opening flac: %s\n",file); + break; + case FLAC__FILE_DECODER_MEMORY_ALLOCATION_ERROR: + ERROR("flac allocation error\n"); + break; + case FLAC__FILE_DECODER_SEEK_ERROR: + ERROR("flac seek error: %s\n",file); + break; + case FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR: + ERROR("flac seekable stream error: %s\n",file); + break; + case FLAC__FILE_DECODER_ALREADY_INITIALIZED: + ERROR("flac decoder already initilaized: %s\n",file); + break; + case FLAC__FILE_DECODER_INVALID_CALLBACK: + ERROR("invalid flac callback\n"); + break; + case FLAC__FILE_DECODER_UNINITIALIZED: + ERROR("flac decoder uninitialized: %s\n",file); + break; + case FLAC__FILE_DECODER_OK: + case FLAC__FILE_DECODER_END_OF_FILE: + break; + } +} + +void flacMetadata(const FLAC__FileDecoder *dec, const FLAC__StreamMetadata *meta, void *data) { +} + +int flacSendChunk(FlacData * data) { + while(data->cb->begin==data->cb->end && data->cb->wrap && + !data->dc->stop && !data->dc->seek) + { + usleep(1000); + } + + if(data->dc->stop) return -1; + if(data->dc->seek) return 0; + +#ifdef WORDS_BIGENDIAN + pcm_changeBufferEndianness(chunk,CHUNK_SIZE,data->af->bits); +#endif + memcpy(data->cb->chunks+data->cb->end*CHUNK_SIZE,data->chunk, + CHUNK_SIZE); + data->cb->chunkSize[data->cb->end] = data->chunk_length; + data->cb->times[data->cb->end] = data->time; + data->cb->bitRate[data->cb->end] = 0; + + data->cb->end++; + if(data->cb->end>=BUFFERED_CHUNKS) { + data->cb->end = 0; + data->cb->wrap = 1; + } + + return 0; +} + +FLAC__StreamDecoderWriteStatus flacWrite(const FLAC__FileDecoder *dec, const FLAC__Frame *frame, const FLAC__int32 * const buf[], void * vdata) { + FlacData * data = (FlacData *)vdata; + FLAC__uint32 samples = frame->header.blocksize; + FLAC__uint16 u16; + unsigned char * uc; + int c_samp, c_chan, d_samp; + int i; + + data->time+=((float)samples)/frame->header.sample_rate; + + for(c_samp = d_samp = 0; c_samp < frame->header.blocksize; c_samp++) { + for(c_chan = 0; c_chan < frame->header.channels; + c_chan++, d_samp++) { + u16 = buf[c_chan][c_samp]; + uc = (unsigned char *)&u16; + for(i=0;i<(data->af->bits/8);i++) { + if(data->chunk_length>=CHUNK_SIZE) { + if(flacSendChunk(data)<0) { + return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; + } + data->chunk_length = 0; + if(data->dc->seek) { + return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; + } + } + data->chunk[data->chunk_length++] = *(uc++); + } + } + } + + return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; +} + +int flac_getAudioFormatAndTime(char * file, AudioFormat * format, float * time) { + FLAC__Metadata_SimpleIterator * it; + FLAC__StreamMetadata * block = NULL; + int found = 0; + int ret = -1; + + if(!(it = FLAC__metadata_simple_iterator_new())) return -1; + if(!FLAC__metadata_simple_iterator_init(it,file,1,0)) { + FLAC__metadata_simple_iterator_delete(it); + return -1; + } + + do { + if(block) FLAC__metadata_object_delete(block); + block = FLAC__metadata_simple_iterator_get_block(it); + if(block->type == FLAC__METADATA_TYPE_STREAMINFO) found=1; + } while(!found && FLAC__metadata_simple_iterator_next(it)); + + if(found) { + format->bits = block->data.stream_info.bits_per_sample; + format->bits = 16; + format->sampleRate = block->data.stream_info.sample_rate; + format->channels = block->data.stream_info.channels; + *time = ((float)block->data.stream_info.total_samples)/ + format->sampleRate; + ret = 0; + } + + if(block) FLAC__metadata_object_delete(block); + FLAC__metadata_simple_iterator_delete(it); + + return ret; +} + +int flac_decode(Buffer * cb, AudioFormat * af, DecoderControl * dc) { + if(flac_getAudioFormatAndTime(dc->file,af,&(cb->totalTime))<0) { + ERROR("\"%s\" doesn't seem to be a flac\n",dc->file); + return -1; + } + + dc->state = DECODE_STATE_DECODE; + dc->start = 0; + + flacPlayFile(dc->file,cb,af,dc); + + if(dc->seek) dc->seek = 0; + + if(dc->stop) { + dc->state = DECODE_STATE_STOP; + dc->stop = 0; + } + else dc->state = DECODE_STATE_STOP; + + return 0; +} + +#endif |