mirror of https://github.com/mpv-player/mpv
94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
/*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#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 const 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 "native/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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sh_audio->samplesize=2;
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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 = sh->wf->nChannels; // 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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