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mpv/libmpcodecs/dec_audio.c

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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"
#include "stream.h"
#include "demuxer.h"
#include "codec-cfg.h"
#include "stheader.h"
#include "dec_audio.h"
#include "ad.h"
#include "../libao2/afmt.h"
#include "../libaf/af.h"
#ifdef USE_FAKE_MONO
int fakemono=0;
#endif
/* used for ac3surround decoder - set using -channels option */
int audio_output_channels = 2;
af_cfg_t af_cfg; // Configuration for audio filters
static ad_functions_t* mpadec;
void afm_help(){
int i;
mp_msg(MSGT_DECAUDIO,MSGL_INFO,MSGTR_AvailableAudioFm);
mp_msg(MSGT_DECAUDIO,MSGL_INFO," afm: info: (comment)\n");
for (i=0; mpcodecs_ad_drivers[i] != NULL; i++)
if(mpcodecs_ad_drivers[i]->info->comment && mpcodecs_ad_drivers[i]->info->comment[0])
mp_msg(MSGT_DECAUDIO,MSGL_INFO,"%9s %s (%s)\n",
mpcodecs_ad_drivers[i]->info->short_name,
mpcodecs_ad_drivers[i]->info->name,
mpcodecs_ad_drivers[i]->info->comment);
else
mp_msg(MSGT_DECAUDIO,MSGL_INFO,"%9s %s\n",
mpcodecs_ad_drivers[i]->info->short_name,
mpcodecs_ad_drivers[i]->info->name);
}
int init_audio_codec(sh_audio_t *sh_audio)
{
// reset in/out buffer size/pointer:
sh_audio->a_buffer_size=0;
sh_audio->a_buffer=NULL;
sh_audio->a_in_buffer_size=0;
sh_audio->a_in_buffer=NULL;
// Set up some common usefull defaults. ad->preinit() can override these:
sh_audio->samplesize=2;
#ifdef WORDS_BIGENDIAN
sh_audio->sample_format=AFMT_S16_BE;
#else
sh_audio->sample_format=AFMT_S16_LE;
#endif
sh_audio->samplerate=0;
sh_audio->channels=0;
sh_audio->i_bps=0; // input rate (bytes/sec)
sh_audio->o_bps=0; // output rate (bytes/sec)
sh_audio->audio_out_minsize=8192;/* default size, maybe not enough for Win32/ACM*/
sh_audio->audio_in_minsize=0;
if(!mpadec->preinit(sh_audio))
{
mp_msg(MSGT_DECAUDIO,MSGL_ERR,MSGTR_ADecoderPreinitFailed);
return 0;
}
/* allocate audio in buffer: */
if(sh_audio->audio_in_minsize>0){
sh_audio->a_in_buffer_size=sh_audio->audio_in_minsize;
mp_msg(MSGT_DECAUDIO,MSGL_V,MSGTR_AllocatingBytesForInputBuffer,
sh_audio->a_in_buffer_size);
sh_audio->a_in_buffer=malloc(sh_audio->a_in_buffer_size);
memset(sh_audio->a_in_buffer,0,sh_audio->a_in_buffer_size);
sh_audio->a_in_buffer_len=0;
}
/* allocate audio out buffer: */
sh_audio->a_buffer_size=sh_audio->audio_out_minsize+MAX_OUTBURST; /* worst case calc.*/
mp_msg(MSGT_DECAUDIO,MSGL_V,MSGTR_AllocatingBytesForOutputBuffer,
sh_audio->audio_out_minsize,MAX_OUTBURST,sh_audio->a_buffer_size);
sh_audio->a_buffer=malloc(sh_audio->a_buffer_size);
if(!sh_audio->a_buffer){
mp_msg(MSGT_DECAUDIO,MSGL_ERR,MSGTR_CantAllocAudioBuf);
return 0;
}
memset(sh_audio->a_buffer,0,sh_audio->a_buffer_size);
sh_audio->a_buffer_len=0;
if(!mpadec->init(sh_audio)){
mp_msg(MSGT_DECAUDIO,MSGL_WARN,MSGTR_ADecoderInitFailed);
uninit_audio(sh_audio); // free buffers
return 0;
}
sh_audio->inited=1;
if(!sh_audio->channels || !sh_audio->samplerate){
mp_msg(MSGT_DECAUDIO,MSGL_WARN,MSGTR_UnknownAudio);
uninit_audio(sh_audio); // free buffers
return 0;
}
if(!sh_audio->o_bps)
sh_audio->o_bps=sh_audio->channels*sh_audio->samplerate*sh_audio->samplesize;
mp_msg(MSGT_DECAUDIO,MSGL_INFO,"AUDIO: %d Hz, %d ch, %d bit (0x%X), ratio: %d->%d (%3.1f kbit)\n",
sh_audio->samplerate,sh_audio->channels,
sh_audio->samplesize*8,sh_audio->sample_format,
sh_audio->i_bps,sh_audio->o_bps,sh_audio->i_bps*8*0.001);
sh_audio->a_out_buffer_size=sh_audio->a_buffer_size;
sh_audio->a_out_buffer=sh_audio->a_buffer;
sh_audio->a_out_buffer_len=sh_audio->a_buffer_len;
return 1;
}
int init_audio(sh_audio_t *sh_audio,char* codecname,char* afm,int status){
unsigned int orig_fourcc=sh_audio->wf?sh_audio->wf->wFormatTag:0;
sh_audio->codec=NULL;
while(1){
int i;
// restore original fourcc:
if(sh_audio->wf) sh_audio->wf->wFormatTag=i=orig_fourcc;
if(!(sh_audio->codec=find_codec(sh_audio->format,
sh_audio->wf?(&i):NULL, sh_audio->codec,1) )) break;
if(sh_audio->wf) sh_audio->wf->wFormatTag=i;
// ok we found one codec
if(sh_audio->codec->flags&CODECS_FLAG_SELECTED) continue; // already tried & failed
if(codecname && strcmp(sh_audio->codec->name,codecname)) continue; // -ac
if(afm && strcmp(sh_audio->codec->drv,afm)) continue; // afm doesn't match
if(sh_audio->codec->status<status) continue; // too unstable
sh_audio->codec->flags|=CODECS_FLAG_SELECTED; // tagging it
// ok, it matches all rules, let's find the driver!
for (i=0; mpcodecs_ad_drivers[i] != NULL; i++)
if(!strcmp(mpcodecs_ad_drivers[i]->info->short_name,sh_audio->codec->drv)) break;
mpadec=mpcodecs_ad_drivers[i];
if(!mpadec){ // driver not available (==compiled in)
mp_msg(MSGT_DECAUDIO,MSGL_ERR,MSGTR_AudioCodecFamilyNotAvailableStr,
sh_audio->codec->name, sh_audio->codec->drv);
continue;
}
// it's available, let's try to init!
// init()
mp_msg(MSGT_DECAUDIO,MSGL_INFO,MSGTR_OpeningAudioDecoder,mpadec->info->short_name,mpadec->info->name);
if(!init_audio_codec(sh_audio)){
mp_msg(MSGT_DECAUDIO,MSGL_INFO,MSGTR_ADecoderInitFailed);
continue; // try next...
}
// Yeah! We got it!
return 1;
}
return 0;
}
extern char *get_path(char *filename);
int init_best_audio_codec(sh_audio_t *sh_audio,char** audio_codec_list,char** audio_fm_list){
char* ac_l_default[2]={"",(char*)NULL};
// hack:
if(!audio_codec_list) audio_codec_list=ac_l_default;
// Go through the codec.conf and find the best codec...
sh_audio->inited=0;
codecs_reset_selection(1);
while(!sh_audio->inited && *audio_codec_list){
char* audio_codec=*(audio_codec_list++);
if(audio_codec[0]){
if(audio_codec[0]=='-'){
// disable this codec:
select_codec(audio_codec+1,1);
} else {
// forced codec by name:
mp_msg(MSGT_DECAUDIO,MSGL_INFO,MSGTR_ForcedAudioCodec,audio_codec);
init_audio(sh_audio,audio_codec,NULL,-1);
}
} else {
int status;
// try in stability order: UNTESTED, WORKING, BUGGY. never try CRASHING.
if(audio_fm_list){
char** fmlist=audio_fm_list;
// try first the preferred codec families:
while(!sh_audio->inited && *fmlist){
char* audio_fm=*(fmlist++);
mp_msg(MSGT_DECAUDIO,MSGL_INFO,MSGTR_TryForceAudioFmtStr,audio_fm);
for(status=CODECS_STATUS__MAX;status>=CODECS_STATUS__MIN;--status)
if(init_audio(sh_audio,NULL,audio_fm,status)) break;
}
}
if(!sh_audio->inited)
for(status=CODECS_STATUS__MAX;status>=CODECS_STATUS__MIN;--status)
if(init_audio(sh_audio,NULL,NULL,status)) break;
}
}
if(!sh_audio->inited){
mp_msg(MSGT_DECAUDIO,MSGL_HINT, MSGTR_TryUpgradeCodecsConfOrRTFM,get_path("codecs.conf"));
mp_msg(MSGT_DECAUDIO,MSGL_ERR,MSGTR_CantFindAudioCodec,sh_audio->format);
return 0; // failed
}
mp_msg(MSGT_DECAUDIO,MSGL_INFO,"Selected audio codec: [%s] afm:%s (%s)\n",
sh_audio->codec->name,sh_audio->codec->drv,sh_audio->codec->info);
return 1; // success
}
void uninit_audio(sh_audio_t *sh_audio)
{
if(sh_audio->afilter){
mp_msg(MSGT_DECAUDIO,MSGL_V,"Uninit audio filters...\n");
af_uninit(sh_audio->afilter);
sh_audio->afilter=NULL;
}
if(sh_audio->inited){
mp_msg(MSGT_DECAUDIO,MSGL_V,MSGTR_UninitAudioStr,sh_audio->codec->drv);
mpadec->uninit(sh_audio);
sh_audio->inited=0;
}
if(sh_audio->a_out_buffer!=sh_audio->a_buffer) free(sh_audio->a_out_buffer);
sh_audio->a_out_buffer=NULL;
if(sh_audio->a_buffer) free(sh_audio->a_buffer);
sh_audio->a_buffer=NULL;
if(sh_audio->a_in_buffer) free(sh_audio->a_in_buffer);
sh_audio->a_in_buffer=NULL;
}
/* Init audio filters */
int init_audio_filters(sh_audio_t *sh_audio,
int in_samplerate, int in_channels, int in_format, int in_bps,
int out_samplerate, int out_channels, int out_format, int out_bps,
int out_minsize, int out_maxsize){
af_stream_t* afs=malloc(sizeof(af_stream_t));
memset(afs,0,sizeof(af_stream_t));
// input format: same as codec's output format:
afs->input.rate = in_samplerate;
afs->input.nch = in_channels;
afs->input.format = in_format;
afs->input.bps = in_bps;
// output format: same as ao driver's input format (if missing, fallback to input)
afs->output.rate = out_samplerate ? out_samplerate : afs->input.rate;
afs->output.nch = out_channels ? out_channels : afs->input.nch;
afs->output.format = out_format ? out_format : afs->input.format;
afs->output.bps = out_bps ? out_bps : afs->input.bps;
// filter config:
memcpy(&afs->cfg,&af_cfg,sizeof(af_cfg_t));
mp_msg(MSGT_DECAUDIO, MSGL_INFO, "Building audio filter chain for %dHz/%dch/%dbit -> %dHz/%dch/%dbit...\n",
afs->input.rate,afs->input.nch,afs->input.bps*8,
afs->output.rate,afs->output.nch,afs->output.bps*8);
// let's autoprobe it!
if(0 != af_init(afs)){
free(afs);
return 0; // failed :(
}
// allocate the a_out_* buffers:
if(out_maxsize<out_minsize) out_maxsize=out_minsize;
if(out_maxsize<8192) out_maxsize=MAX_OUTBURST; // not sure this is ok
sh_audio->a_out_buffer_size=out_maxsize;
sh_audio->a_out_buffer=malloc(sh_audio->a_out_buffer_size);
memset(sh_audio->a_out_buffer,0,sh_audio->a_out_buffer_size);
sh_audio->a_out_buffer_len=0;
// ok!
sh_audio->afilter=(void*)afs;
return 1;
}
int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
{
int declen;
af_data_t afd; // filter input
af_data_t* pafd; // filter output
if(!sh_audio->inited) return -1; // no codec
if(!sh_audio->afilter){
// no filter, just decode:
// FIXME: don't drop initial decoded data in a_buffer!
return mpadec->decode_audio(sh_audio,buf,minlen,maxlen);
}
// declen=af_inputlen(sh_audio->afilter,minlen);
declen=af_calc_insize_constrained(sh_audio->afilter,minlen,maxlen,
sh_audio->a_buffer_size-sh_audio->audio_out_minsize);
mp_msg(MSGT_DECAUDIO,MSGL_DBG2,"\ndecaudio: minlen=%d maxlen=%d declen=%d (max=%d)\n",
minlen, maxlen, declen, sh_audio->a_buffer_size);
if(declen<=0) return -1; // error!
// limit declen to buffer size: - DONE by af_calc_insize_constrained
// if(declen>sh_audio->a_buffer_size) declen=sh_audio->a_buffer_size;
// decode if needed:
while(declen>sh_audio->a_buffer_len){
int len=declen-sh_audio->a_buffer_len;
int maxlen=sh_audio->a_buffer_size-sh_audio->a_buffer_len;
mp_msg(MSGT_DECAUDIO,MSGL_DBG2,"decaudio: decoding %d bytes, max: %d (%d)\n",
len, maxlen, sh_audio->audio_out_minsize);
if(maxlen<sh_audio->audio_out_minsize) break; // don't overflow buffer!
// not enough decoded data waiting, decode 'len' bytes more:
len=mpadec->decode_audio(sh_audio,
sh_audio->a_buffer+sh_audio->a_buffer_len, len, maxlen);
if(len<=0) break; // EOF?
sh_audio->a_buffer_len+=len;
}
if(declen>sh_audio->a_buffer_len)
declen=sh_audio->a_buffer_len; // still no enough data (EOF) :(
// round to whole samples:
// declen/=sh_audio->samplesize*sh_audio->channels;
// declen*=sh_audio->samplesize*sh_audio->channels;
// run the filters:
afd.audio=sh_audio->a_buffer;
afd.len=declen;
afd.rate=sh_audio->samplerate;
afd.nch=sh_audio->channels;
afd.format=sh_audio->sample_format;
afd.bps=sh_audio->samplesize;
//pafd=&afd;
// printf("\nAF: %d --> ",declen);
pafd=af_play(sh_audio->afilter,&afd);
// printf("%d \n",pafd->len);
if(!pafd) return -1; // error
mp_msg(MSGT_DECAUDIO,MSGL_DBG2,"decaudio: declen=%d out=%d (max %d)\n",
declen, pafd->len, maxlen);
// copy filter==>out:
if(maxlen < pafd->len)
mp_msg(MSGT_DECAUDIO,MSGL_WARN,"%i bytes of audio data lost due to buffer overflow, len = %i", pafd->len - maxlen,pafd->len);
else
maxlen=pafd->len;
memmove(buf, pafd->audio, maxlen);
// remove processed data from decoder buffer:
sh_audio->a_buffer_len-=declen;
if(sh_audio->a_buffer_len>0)
memmove(sh_audio->a_buffer, sh_audio->a_buffer+declen, sh_audio->a_buffer_len);
return maxlen;
}
void resync_audio_stream(sh_audio_t *sh_audio)
{
sh_audio->a_in_buffer_len=0; // clear audio input buffer
if(!sh_audio->inited) return;
mpadec->control(sh_audio,ADCTRL_RESYNC_STREAM,NULL);
}
void skip_audio_frame(sh_audio_t *sh_audio)
{
if(!sh_audio->inited) return;
if(mpadec->control(sh_audio,ADCTRL_SKIP_FRAME,NULL)==CONTROL_TRUE) return;
// default skip code:
ds_fill_buffer(sh_audio->ds); // skip block
}
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