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mpv/libmpcodecs/ad_alaw.c
Uoti Urpala b0986b3760 Merge svn changes up to r30463
Note that r30455 is wrong, that commit does not in fact change the
default behavior as claimed in the commit message. It only breaks
"-af-adv force=0", which was already pretty much useless though.
2010-03-09 18:59:15 +02:00

94 lines
2.2 KiB
C

/*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "config.h"
#include "ad_internal.h"
static const ad_info_t info =
{
"aLaw/uLaw audio decoder",
"alaw",
"Nick Kurshev",
"A'rpi",
""
};
LIBAD_EXTERN(alaw)
#include "native/alaw.h"
static int init(sh_audio_t *sh_audio)
{
/* aLaw audio codec:*/
if(!sh_audio->wf) return 0;
sh_audio->channels=sh_audio->wf->nChannels;
sh_audio->samplerate=sh_audio->wf->nSamplesPerSec;
sh_audio->i_bps=sh_audio->channels*sh_audio->samplerate;
sh_audio->samplesize=2;
return 1;
}
static int preinit(sh_audio_t *sh)
{
sh->audio_out_minsize=2048;
sh->ds->ss_div = 1; // 1 samples/packet
sh->ds->ss_mul = sh->wf->nChannels; // bytes/packet
return 1;
}
static void uninit(sh_audio_t *sh)
{
}
static int control(sh_audio_t *sh,int cmd,void* arg, ...)
{
int skip;
switch(cmd)
{
case ADCTRL_SKIP_FRAME:
skip=sh->i_bps/16;
skip=skip&(~3);
demux_read_data(sh->ds,NULL,skip);
return CONTROL_TRUE;
default:
return CONTROL_UNKNOWN;
}
return CONTROL_UNKNOWN;
}
static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
{
int len;
int l=demux_read_data(sh_audio->ds,buf,minlen/2);
unsigned short *d=(unsigned short *) buf;
unsigned char *s=buf;
len=2*l;
if(sh_audio->format==6 || sh_audio->format==0x77616C61){
/* aLaw */
while(l>0){ --l; d[l]=alaw2short[s[l]]; }
} else {
/* uLaw */
while(l>0){ --l; d[l]=ulaw2short[s[l]]; }
}
return len;
}