dec_audio.c

来自「君正早期ucos系统(只有早期的才不没有打包成库),MPLAYER,文件系统,图」· C语言 代码 · 共 496 行 · 第 1/2 页

    }
    return 0;
}

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_ERR,MSGTR_CantFindAudioCodec,sh_audio->format);
    mp_msg(MSGT_DECAUDIO,MSGL_HINT, MSGTR_RTFMCodecs);
    return 0; // failed
}

mp_msg(MSGT_DECAUDIO,MSGL_INFO,MSGTR_SelectedAudioCodec,
    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);
	free(sh_audio->afilter);
	sh_audio->afilter=NULL;
    }
    if(sh_audio->inited){
	mp_msg(MSGT_DECAUDIO,MSGL_V,MSGTR_UninitAudioStr,sh_audio->codec->drv);
	sh_audio->ad_driver->uninit(sh_audio);
#ifdef DYNAMIC_PLUGINS
	if (sh_audio->dec_handle)
	    dlclose(sh_audio->dec_handle);
#endif
	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;
    sh_audio->a_out_buffer_size=0;
    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 preinit_audio_filters(sh_audio_t *sh_audio, 
	int in_samplerate, int in_channels, int in_format,
	int* out_samplerate, int* out_channels, int* out_format){
  return init_audio_filters(sh_audio, in_samplerate, in_channels, in_format,
      out_samplerate, out_channels, out_format, 0, 0);
}

 /* Init audio filters */
int init_audio_filters(sh_audio_t *sh_audio, 
	int in_samplerate, int in_channels, int in_format,
	int *out_samplerate, int *out_channels, int *out_format,
	int out_minsize, int out_maxsize){
  af_stream_t* afs=sh_audio->afilter;
  if(!afs){
    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;
  af_fix_parameters(&(afs->input));

  // output format: same as ao driver's input format (if missing, fallback to input)
  afs->output.rate   = *out_samplerate;
  afs->output.nch    = *out_channels;
  afs->output.format = *out_format;
  af_fix_parameters(&(afs->output));

  // filter config:  
  memcpy(&afs->cfg,&af_cfg,sizeof(af_cfg_t));
  
  mp_msg(MSGT_DECAUDIO, MSGL_V, MSGTR_BuildingAudioFilterChain,
      afs->input.rate,afs->input.nch,af_fmt2str_short(afs->input.format),
      afs->output.rate,afs->output.nch,af_fmt2str_short(afs->output.format));
  
  // let's autoprobe it!
  if(0 != af_init(afs)){
    sh_audio->afilter=NULL;
    free(afs);
    return 0; // failed :(
  }

  *out_samplerate=afs->output.rate;
  *out_channels=afs->output.nch;
  *out_format=afs->output.format;
  
  if (out_maxsize || out_minsize) {
  // 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;
  if (sh_audio->a_out_buffer != sh_audio->a_buffer)
      free(sh_audio->a_out_buffer);
  sh_audio->a_out_buffer=memalign(16,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
  ad_functions_t* mpadec = sh_audio->ad_driver;

  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);

      // When a decoder sets audio_out_minsize that should guarantee it can
      // write up to audio_out_minsize bytes at a time until total >= minlen
      // without checking maxlen. Thus maxlen must be at least minlen +
      // audio_out_minsize. Check that to guard against buffer overflows.
      if (maxlen < len + sh_audio->audio_out_minsize)
	  break;
      // 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;
  af_fix_parameters(&afd);
  //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) {
    af_stream_t *afs = sh_audio->afilter;
    maxlen -= maxlen % (afs->output.nch * afs->output.bps);
    mp_msg(MSGT_DECAUDIO,MSGL_WARN,"%i bytes of audio data lost due to buffer overflow, len = %i\n", 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;
  sh_audio->ad_driver->control(sh_audio,ADCTRL_RESYNC_STREAM,NULL);
}

void skip_audio_frame(sh_audio_t *sh_audio)
{
  if(!sh_audio->inited) return;
  if(sh_audio->ad_driver->control(sh_audio,ADCTRL_SKIP_FRAME,NULL)==CONTROL_TRUE) return;
  // default skip code:
  ds_fill_buffer(sh_audio->ds);  // skip block
}