mpd/src/ogg_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
*/
#include "ogg_decode.h"
#ifdef HAVE_OGG
#include "command.h"
#include "utils.h"
#include "audio.h"
#include "log.h"
#include "pcm_utils.h"
#include "inputStream.h"
#include "outputBuffer.h"
#include "replayGain.h"
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <vorbis/vorbisfile.h>
#include <errno.h>
#ifdef WORDS_BIGENDIAN
#define OGG_DECODE_USE_BIGENDIAN 1
#else
#define OGG_DECODE_USE_BIGENDIAN 0
#endif
/* this is just for tag parsing for db import! */
int getOggTotalTime(char * file) {
OggVorbis_File vf;
FILE * oggfp;
int totalTime;
if(!(oggfp = fopen(file,"r"))) return -1;
if(ov_open(oggfp, &vf, NULL, 0) < 0) {
fclose(oggfp);
return -1;
}
totalTime = ov_time_total(&vf,-1)+0.5;
ov_clear(&vf);
return totalTime;
}
size_t ogg_read_cb(void * ptr, size_t size, size_t nmemb, void * inStream)
{
size_t ret;
ret = readFromInputStream((InputStream *)inStream,ptr,size,nmemb);
if(ret<0) errno = ((InputStream *)inStream)->error;
return ret;
}
int ogg_seek_cb(void * inStream, ogg_int64_t offset, int whence) {
return seekInputStream((InputStream *)inStream,offset,whence);
}
int ogg_close_cb(void * inStream) {
return closeInputStream((InputStream *)inStream);
}
long ogg_tell_cb(void * inStream) {
return ((InputStream *)inStream)->offset;
}
char * ogg_parseComment(char * comment, char * needle) {
int len = strlen(needle);
if(strncasecmp(comment,needle,len)) return comment+len;
return NULL;
}
float ogg_getReplayGainScale(char ** comments) {
int trackGainFound = 0;
int albumGainFound = 0;
float trackGain = 1.0;
float albumGain = 1.0;
float trackPeak = 0.0;
float albumPeak = 0.0;
char * temp;
int replayGainState = getReplayGainState();
if(replayGainState == REPLAYGAIN_OFF) return 1.0;
while(*comments) {
if((temp = ogg_parseComment(*comments,"replaygain_track_gain")))
{
trackGain = atof(temp);
trackGainFound = 1;
}
else if((temp = ogg_parseComment(*comments,
"replaygain_album_gain")))
{
albumGain = atof(temp);
albumGainFound = 1;
}
else if((temp = ogg_parseComment(*comments,
"replaygain_track_peak")))
{
trackPeak = atof(temp);
}
else if((temp = ogg_parseComment(*comments,
"replaygain_album_peak")))
{
albumPeak = atof(temp);
}
comments++;
}
switch(replayGainState) {
case REPLAYGAIN_ALBUM:
if(albumGainFound) {
return computeReplayGainScale(albumGain,albumPeak);
}
default:
return computeReplayGainScale(trackGain,trackPeak);
}
return 1.0;
}
int ogg_decode(OutputBuffer * cb, DecoderControl * dc)
{
OggVorbis_File vf;
ov_callbacks callbacks;
InputStream inStream;
callbacks.read_func = ogg_read_cb;
callbacks.seek_func = ogg_seek_cb;
callbacks.close_func = ogg_close_cb;
callbacks.tell_func = ogg_tell_cb;
if(openInputStreamFromFile(&inStream,dc->file)<0) {
ERROR("failed to open ogg\n");
return -1;
}
if(ov_open_callbacks(&inStream, &vf, NULL, 0, callbacks) < 0) {
ERROR("Input does not appear to be an Ogg bit stream.\n");
closeInputStream(&inStream);
return -1;
}
{
vorbis_info *vi=ov_info(&vf,-1);
dc->audioFormat.bits = 16;
dc->audioFormat.channels = vi->channels;
dc->audioFormat.sampleRate = vi->rate;
getOutputAudioFormat(&(dc->audioFormat),&(cb->audioFormat));
}
dc->totalTime = ov_time_total(&vf,-1);
dc->state = DECODE_STATE_DECODE;
dc->start = 0;
{
int current_section;
int eof = 0;
long ret;
char chunk[CHUNK_SIZE];
int chunkpos = 0;
long bitRate = 0;
long test;
float replayGainScale = ogg_getReplayGainScale(
ov_comment(&vf,-1)->user_comments);
while(!eof) {
if(dc->seek) {
cb->end = cb->begin;
cb->wrap = 0;
chunkpos = 0;
ov_time_seek_page(&vf,dc->seekWhere);
dc->seek = 0;
}
ret = ov_read(&vf, chunk, CHUNK_SIZE,
OGG_DECODE_USE_BIGENDIAN,
2, 1, &current_section);
if(ret<=0) eof = 1;
else {
if((test = ov_bitrate_instant(&vf))>0) {
bitRate = test/1000;
}
doReplayGain(chunk,ret,&(dc->audioFormat),
replayGainScale);
sendDataToOutputBuffer(cb,dc,chunk,ret,
ov_time_tell(&vf),bitRate);
if(dc->stop) break;
}
}
ov_clear(&vf);
flushOutputBuffer(cb);
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
/* vim:set shiftwidth=4 tabstop=8 expandtab: */