mirror of https://github.com/mpv-player/mpv
75 lines
1.4 KiB
C
75 lines
1.4 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "config.h"
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#include "ad_internal.h"
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static ad_info_t info =
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{
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"aLaw/uLaw audio decoder",
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"alaw",
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"Nick Kurshev",
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"A'rpi",
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""
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};
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LIBAD_EXTERN(alaw)
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#include "alaw.h"
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static int init(sh_audio_t *sh_audio)
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{
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/* aLaw audio codec:*/
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if(!sh_audio->wf) return 0;
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sh_audio->channels=sh_audio->wf->nChannels;
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sh_audio->samplerate=sh_audio->wf->nSamplesPerSec;
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sh_audio->i_bps=sh_audio->channels*sh_audio->samplerate;
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return 1;
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}
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static int preinit(sh_audio_t *sh)
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{
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sh->audio_out_minsize=2048;
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sh->ds->ss_div = 1; // 1 samples/packet
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sh->ds->ss_mul = 1; // 1 bytes/packet
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return 1;
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}
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static void uninit(sh_audio_t *sh)
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{
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}
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static int control(sh_audio_t *sh,int cmd,void* arg, ...)
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{
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int skip;
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switch(cmd)
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{
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case ADCTRL_SKIP_FRAME:
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skip=sh->i_bps/16;
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skip=skip&(~3);
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demux_read_data(sh->ds,NULL,skip);
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return CONTROL_TRUE;
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default:
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return CONTROL_UNKNOWN;
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}
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return CONTROL_UNKNOWN;
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}
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static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
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{
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int len;
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int l=demux_read_data(sh_audio->ds,buf,minlen/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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if(sh_audio->format==6 || sh_audio->format==0x77616C61){
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/* aLaw */
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while(l>0){ --l; d[l]=alaw2short[s[l]]; }
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} else {
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/* uLaw */
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while(l>0){ --l; d[l]=ulaw2short[s[l]]; }
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}
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return len;
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}
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