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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "config.h"
#include "ad_internal.h"
#include "libaf/af_format.h"
static ad_info_t info =
{
"Uncompressed PCM audio decoder",
"pcm",
"Nick Kurshev",
"A'rpi",
""
};
LIBAD_EXTERN(pcm)
static int init(sh_audio_t *sh_audio)
{
WAVEFORMATEX *h=sh_audio->wf;
sh_audio->i_bps=h->nAvgBytesPerSec;
sh_audio->channels=h->nChannels;
sh_audio->samplerate=h->nSamplesPerSec;
sh_audio->samplesize=(h->wBitsPerSample+7)/8;
sh_audio->sample_format=AF_FORMAT_S16_LE; // default
switch(sh_audio->format){ /* hardware formats: */
case 0x0:
case 0x1: // Microsoft PCM
case 0xfffe: // Extended
switch (sh_audio->samplesize) {
case 1: sh_audio->sample_format=AF_FORMAT_U8; break;
case 2: sh_audio->sample_format=AF_FORMAT_S16_LE; break;
case 3: sh_audio->sample_format=AF_FORMAT_S24_LE; break;
case 4: sh_audio->sample_format=AF_FORMAT_S32_LE; break;
}
break;
case 0x3: // IEEE float
sh_audio->sample_format=AF_FORMAT_FLOAT_LE;
break;
case 0x6: sh_audio->sample_format=AF_FORMAT_A_LAW;break;
case 0x7: sh_audio->sample_format=AF_FORMAT_MU_LAW;break;
case 0x11: sh_audio->sample_format=AF_FORMAT_IMA_ADPCM;break;
case 0x50: sh_audio->sample_format=AF_FORMAT_MPEG2;break;
/* case 0x2000: sh_audio->sample_format=AFMT_AC3; */
case 0x20776172: // 'raw '
sh_audio->sample_format=AF_FORMAT_S16_BE;
if(sh_audio->samplesize==1) sh_audio->sample_format=AF_FORMAT_U8;
break;
case 0x736F7774: // 'twos'
sh_audio->sample_format=AF_FORMAT_S16_BE;
// intended fall-through
case 0x74776F73: // 'swot'
if(sh_audio->samplesize==1) sh_audio->sample_format=AF_FORMAT_S8;
break;
case 0x32336c66: // 'fl32', bigendian float32
sh_audio->sample_format=AF_FORMAT_FLOAT_BE;
sh_audio->samplesize=4;
break;
case 0x666c3332: // '23lf', little endian float32, MPlayer internal fourCC
sh_audio->sample_format=AF_FORMAT_FLOAT_LE;
sh_audio->samplesize=4;
break;
/* case 0x34366c66: // 'fl64', bigendian float64
sh_audio->sample_format=AF_FORMAT_FLOAT_BE;
sh_audio->samplesize=8;
break;
case 0x666c3634: // '46lf', little endian float64, MPlayer internal fourCC
sh_audio->sample_format=AF_FORMAT_FLOAT_LE;
sh_audio->samplesize=8;
break;*/
case 0x34326e69: // 'in24', bigendian int24
sh_audio->sample_format=AF_FORMAT_S24_BE;
sh_audio->samplesize=3;
break;
case 0x696e3234: // '42ni', little endian int24, MPlayer internal fourCC
sh_audio->sample_format=AF_FORMAT_S24_LE;
sh_audio->samplesize=3;
break;
case 0x32336e69: // 'in32', bigendian int32
sh_audio->sample_format=AF_FORMAT_S32_BE;
sh_audio->samplesize=4;
break;
case 0x696e3332: // '23ni', little endian int32, MPlayer internal fourCC
sh_audio->sample_format=AF_FORMAT_S32_LE;
sh_audio->samplesize=4;
break;
default: if(sh_audio->samplesize!=2) sh_audio->sample_format=AF_FORMAT_U8;
}
if (!sh_audio->samplesize) // this would cause MPlayer to hang later
sh_audio->samplesize = 2;
return 1;
}
static int preinit(sh_audio_t *sh)
{
sh->audio_out_minsize=2048;
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;
}
return CONTROL_UNKNOWN;
}
static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
{
unsigned len = sh_audio->channels*sh_audio->samplesize;
len = maxlen - maxlen % len; // sample align
len=demux_read_data(sh_audio->ds,buf,len);
return len;
}
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