mpd/src/ogg_decode.c

/* 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(openInputStream(&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;
#define OGG_CHUNK_SIZE 4096
		char chunk[OGG_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) {
                                clearOutputBuffer(cb);
				chunkpos = 0;
				ov_time_seek_page(&vf,dc->seekWhere);
				dc->seek = 0;
			}
			ret = ov_read(&vf, chunk+chunkpos, 
					OGG_CHUNK_SIZE-chunkpos,
					OGG_DECODE_USE_BIGENDIAN,
					2, 1, &current_section);
			if(ret<=0) {
				eof = 1;
				break;
			}

			chunkpos+=ret;

			if(chunkpos >= OGG_CHUNK_SIZE) {
				if((test = ov_bitrate_instant(&vf))>0) {
					bitRate = test/1000;
				}
                                doReplayGain(chunk,ret,&(dc->audioFormat),
                                                replayGainScale);
				sendDataToOutputBuffer(cb,dc,chunk,chunkpos,
					ov_time_tell(&vf),bitRate);
				if(dc->stop) break;
				chunkpos = 0;
			}
		}

		if(!dc->stop && chunkpos > 0) {
			sendDataToOutputBuffer(cb,dc,chunk,chunkpos,
					ov_time_tell(&vf),bitRate);
		}

		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
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