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mpv/dec_audio.c

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int init_audio(sh_audio_t *sh_audio){
int driver=sh_audio->codec->driver;
sh_audio->samplesize=2;
sh_audio->samplerate=0;
//sh_audio->pcm_bswap=0;
sh_audio->a_buffer_size=16384; // default size, maybe not enough for Win32/ACM
sh_audio->a_buffer=NULL;
if(driver==4){
// Win32 ACM audio codec:
if(init_acm_audio_codec(sh_audio)){
sh_audio->channels=sh_audio->o_wf.nChannels;
sh_audio->samplerate=sh_audio->o_wf.nSamplesPerSec;
if(sh_audio->a_buffer_size<sh_audio->audio_out_minsize+OUTBURST)
sh_audio->a_buffer_size=sh_audio->audio_out_minsize+OUTBURST;
} else {
printf("Could not load/initialize Win32/ACM AUDIO codec (missing DLL file?)\n");
driver=0;
}
}
if(driver==7){
#ifndef USE_DIRECTSHOW
printf("Compiled without DirectShow support -> force nosound :(\n");
driver=0;
#else
// Win32 DShow audio codec:
// printf("DShow_audio: channs=%d rate=%d\n",sh_audio->channels,sh_audio->samplerate);
if(DS_AudioDecoder_Open(sh_audio->codec->dll,&sh_audio->codec->guid,sh_audio->wf)){
printf("ERROR: Could not load/initialize Win32/DirctShow AUDIO codec: %s\n",sh_audio->codec->dll);
driver=0;
} else {
sh_audio->channels=sh_audio->wf->nChannels;
sh_audio->samplerate=sh_audio->wf->nSamplesPerSec;
sh_audio->audio_in_minsize=2*sh_audio->wf->nBlockAlign;
if(sh_audio->audio_in_minsize<8192) sh_audio->audio_in_minsize=8192;
sh_audio->a_in_buffer_size=sh_audio->audio_in_minsize;
sh_audio->a_in_buffer=malloc(sh_audio->a_in_buffer_size);
sh_audio->a_in_buffer_len=0;
}
#endif
}
if(!driver) return 0;
// allocate audio out buffer:
sh_audio->a_buffer=malloc(sh_audio->a_buffer_size);
memset(sh_audio->a_buffer,0,sh_audio->a_buffer_size);
sh_audio->a_buffer_len=0;
switch(driver){
case 4: {
int ret=acm_decode_audio(sh_audio,sh_audio->a_buffer,sh_audio->a_buffer_size);
if(ret<0){
printf("ACM decoding error: %d\n",ret);
driver=0;
}
break;
}
case 2: {
// AVI PCM Audio:
WAVEFORMATEX *h=sh_audio->wf;
sh_audio->channels=h->nChannels;
sh_audio->samplerate=h->nSamplesPerSec;
sh_audio->samplesize=(h->wBitsPerSample+7)/8;
break;
}
case 8: {
// DVD PCM Audio:
sh_audio->channels=2;
sh_audio->samplerate=48000;
// sh_audio->pcm_bswap=1;
break;
}
case 3: {
// Dolby AC3 audio:
ac3_config.fill_buffer_callback = ac3_fill_buffer;
ac3_config.num_output_ch = 2;
ac3_config.flags = 0;
#ifdef HAVE_MMX
ac3_config.flags |= AC3_MMX_ENABLE;
#endif
#ifdef HAVE_3DNOW
ac3_config.flags |= AC3_3DNOW_ENABLE;
#endif
ac3_init();
sh_audio->ac3_frame = ac3_decode_frame();
if(sh_audio->ac3_frame){
sh_audio->samplerate=sh_audio->ac3_frame->sampling_rate;
sh_audio->channels=2;
} else {
driver=0; // bad frame -> disable audio
}
break;
}
case 5: {
// aLaw audio codec:
Gen_aLaw_2_Signed(); // init table
sh_audio->channels=sh_audio->wf->nChannels;
sh_audio->samplerate=sh_audio->wf->nSamplesPerSec;
break;
}
case 6: {
// MS-GSM audio codec:
GSM_Init();
sh_audio->channels=sh_audio->wf->nChannels;
sh_audio->samplerate=sh_audio->wf->nSamplesPerSec;
break;
}
case 1: {
// MPEG Audio:
MP3_Init();
MP3_samplerate=MP3_channels=0;
// printf("[\n");
sh_audio->a_buffer_len=MP3_DecodeFrame(sh_audio->a_buffer,-1);
// printf("]\n");
sh_audio->channels=2; // hack
sh_audio->samplerate=MP3_samplerate;
break;
}
}
if(!sh_audio->channels || !sh_audio->samplerate){
printf("Unknown/missing audio format, using nosound\n");
driver=0;
}
if(!driver){
if(sh_audio->a_buffer) free(sh_audio->a_buffer);
sh_audio->o_bps=0;
return 0;
}
sh_audio->o_bps=sh_audio->channels*sh_audio->samplerate*sh_audio->samplesize;
return driver;
}
// Audio decoding
int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int maxlen){
int len=-1;
switch(sh_audio->codec->driver){
case 1: // MPEG layer 2 or 3
len=MP3_DecodeFrame(buf,-1);
sh_audio->channels=2; // hack
break;
case 2: // AVI PCM
{ len=demux_read_data(sh_audio->ds,buf,OUTBURST);
break;
}
case 8: // DVD PCM
{ int j;
len=demux_read_data(sh_audio->ds,buf,OUTBURST);
//if(i&1){ printf("Warning! pcm_audio_size&1 !=0 (%d)\n",i);i&=~1; }
for(j=0;j<len;j+=2){
char x=buf[j];
buf[j]=buf[j+1];
buf[j+1]=x;
}
break;
}
case 5: // aLaw decoder
{ int l=demux_read_data(sh_audio->ds,buf,OUTBURST/2);
unsigned short *d=(unsigned short *) buf;
unsigned char *s=buf;
len=2*l;
while(l>0){
--l;
d[l]=xa_alaw_2_sign[s[l]];
}
break;
}
case 6: // MS-GSM decoder
{ unsigned char buf[65]; // 65 bytes / frame
len=0;
while(len<OUTBURST){
if(demux_read_data(d_audio,buf,65)!=65) break; // EOF
XA_MSGSM_Decoder(buf,(unsigned short *) buf); // decodes 65 byte -> 320 short
// XA_GSM_Decoder(buf,(unsigned short *) &sh_audio->a_buffer[sh_audio->a_buffer_len]); // decodes 33 byte -> 160 short
len+=2*320;
}
break;
}
case 3: // AC3 decoder
//printf("{1:%d}",avi_header.idx_pos);fflush(stdout);
if(!sh_audio->ac3_frame) sh_audio->ac3_frame=ac3_decode_frame();
//printf("{2:%d}",avi_header.idx_pos);fflush(stdout);
if(sh_audio->ac3_frame){
len = 256 * 6 *sh_audio->channels*sh_audio->samplesize;
memcpy(buf,sh_audio->ac3_frame->audio_data,len);
sh_audio->ac3_frame=NULL;
}
//printf("{3:%d}",avi_header.idx_pos);fflush(stdout);
break;
case 4:
{ len=acm_decode_audio(sh_audio,buf,maxlen);
break;
}
#ifdef USE_DIRECTSHOW
case 7: // DirectShow
{ int ret;
int size_in=0;
int size_out=0;
int srcsize=DS_AudioDecoder_GetSrcSize(maxlen);
if(verbose>2)printf("DShow says: srcsize=%d (buffsize=%d) out_size=%d\n",srcsize,sh_audio->a_in_buffer_size,maxlen);
if(srcsize>sh_audio->a_in_buffer_size) srcsize=sh_audio->a_in_buffer_size; // !!!!!!
if(sh_audio->a_in_buffer_len<srcsize){
sh_audio->a_in_buffer_len+=
demux_read_data(sh_audio->ds,&sh_audio->a_in_buffer[sh_audio->a_in_buffer_len],
srcsize-sh_audio->a_in_buffer_len);
}
DS_AudioDecoder_Convert(sh_audio->a_in_buffer,sh_audio->a_in_buffer_len,
buf,maxlen, &size_in,&size_out);
if(verbose>2)printf("DShow: audio %d -> %d converted (in_buf_len=%d of %d)\n",size_in,size_out,sh_audio->a_in_buffer_len,sh_audio->a_in_buffer_size);
if(size_in>=sh_audio->a_in_buffer_len){
sh_audio->a_in_buffer_len=0;
} else {
sh_audio->a_in_buffer_len-=size_in;
memcpy(sh_audio->a_in_buffer,&sh_audio->a_in_buffer[size_in],sh_audio->a_in_buffer_len);
}
len=size_out;
break;
}
#endif
}
return len;
}
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