mirror of https://github.com/mpv-player/mpv
92 lines
3.1 KiB
C
92 lines
3.1 KiB
C
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// Audio decoding
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int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int maxlen){
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int len=-1;
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switch(sh_audio->codec.driver){
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case 1: // MPEG layer 2 or 3
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len=MP3_DecodeFrame(buf,-1);
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MP3_channels=2; // hack
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break;
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case 2: // PCM
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{ len=demux_read_data(sh_audio->ds,buf,OUTBURST);
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if(sh_audio->pcm_bswap){
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int j;
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//if(i&1){ printf("Warning! pcm_audio_size&1 !=0 (%d)\n",i);i&=~1; }
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for(j=0;j<len;j+=2){
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char x=buf[j];
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buf[j]=buf[j+1];
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buf[j+1]=x;
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}
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}
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break;
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}
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case 5: // aLaw decoder
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{ int l=demux_read_data(sh_audio->ds,buf,OUTBURST/2);
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unsigned short *d=(unsigned short *) buf;
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unsigned char *s=buf;
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len=2*l;
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while(l>0){
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--l;
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d[l]=xa_alaw_2_sign[s[l]];
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}
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break;
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}
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case 6: // MS-GSM decoder
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{ unsigned char buf[65]; // 65 bytes / frame
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len=0;
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while(len<OUTBURST){
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if(demux_read_data(d_audio,buf,65)!=65) break; // EOF
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XA_MSGSM_Decoder(buf,(unsigned short *) buf); // decodes 65 byte -> 320 short
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// XA_GSM_Decoder(buf,(unsigned short *) &a_buffer[a_buffer_len]); // decodes 33 byte -> 160 short
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len+=2*320;
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}
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break;
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}
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case 3: // AC3 decoder
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//printf("{1:%d}",avi_header.idx_pos);fflush(stdout);
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if(!sh_audio->ac3_frame) sh_audio->ac3_frame=ac3_decode_frame();
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//printf("{2:%d}",avi_header.idx_pos);fflush(stdout);
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if(sh_audio->ac3_frame){
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len = 256 * 6 *MP3_channels*MP3_bps;
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memcpy(buf,sh_audio->ac3_frame->audio_data,len);
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sh_audio->ac3_frame=NULL;
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}
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//printf("{3:%d}",avi_header.idx_pos);fflush(stdout);
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break;
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case 4:
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{ len=acm_decode_audio(sh_audio,buf,maxlen);
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break;
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}
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#ifdef USE_DIRECTSHOW
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case 7: // DirectShow
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{ int ret;
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int size_in=0;
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int size_out=0;
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int srcsize=DS_AudioDecoder_GetSrcSize(maxlen);
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if(verbose>2)printf("DShow says: srcsize=%d (buffsize=%d) out_size=%d\n",srcsize,sh_audio->a_in_buffer_size,maxlen);
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if(srcsize>sh_audio->a_in_buffer_size) srcsize=sh_audio->a_in_buffer_size; // !!!!!!
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if(sh_audio->a_in_buffer_len<srcsize){
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sh_audio->a_in_buffer_len+=
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demux_read_data(sh_audio->ds,&sh_audio->a_in_buffer[sh_audio->a_in_buffer_len],
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srcsize-sh_audio->a_in_buffer_len);
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}
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DS_AudioDecoder_Convert(sh_audio->a_in_buffer,sh_audio->a_in_buffer_len,
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buf,maxlen, &size_in,&size_out);
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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);
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if(size_in>=sh_audio->a_in_buffer_len){
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sh_audio->a_in_buffer_len=0;
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} else {
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sh_audio->a_in_buffer_len-=size_in;
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memcpy(sh_audio->a_in_buffer,&sh_audio->a_in_buffer[size_in],sh_audio->a_in_buffer_len);
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}
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len=size_out;
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break;
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}
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#endif
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}
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return len;
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}
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