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-rw-r--r--src/flac_decode.c292
1 files changed, 292 insertions, 0 deletions
diff --git a/src/flac_decode.c b/src/flac_decode.c
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+++ b/src/flac_decode.c
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+/* 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