mirror of https://github.com/mpv-player/mpv
146 lines
3.3 KiB
C
146 lines
3.3 KiB
C
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
#include "config.h"
|
|
#include "mp_msg.h"
|
|
#include "help_mp.h"
|
|
#include "ad_internal.h"
|
|
|
|
static ad_info_t info =
|
|
{
|
|
"Uncompressed DVD/VOB LPCM audio decoder",
|
|
"dvdpcm",
|
|
"Nick Kurshev",
|
|
"A'rpi",
|
|
""
|
|
};
|
|
|
|
LIBAD_EXTERN(dvdpcm)
|
|
|
|
static int init(sh_audio_t *sh)
|
|
{
|
|
/* DVD PCM Audio:*/
|
|
sh->i_bps = 0;
|
|
if(sh->codecdata_len==3){
|
|
// we have LPCM header:
|
|
unsigned char h=sh->codecdata[1];
|
|
sh->channels=1+(h&7);
|
|
switch((h>>4)&3){
|
|
case 0: sh->samplerate=48000;break;
|
|
case 1: sh->samplerate=96000;break;
|
|
case 2: sh->samplerate=44100;break;
|
|
case 3: sh->samplerate=32000;break;
|
|
}
|
|
switch ((h >> 6) & 3) {
|
|
case 0:
|
|
sh->sample_format = AF_FORMAT_S16_BE;
|
|
sh->samplesize = 2;
|
|
break;
|
|
case 1:
|
|
mp_msg(MSGT_DECAUDIO, MSGL_INFO, MSGTR_SamplesWanted);
|
|
sh->i_bps = sh->channels * sh->samplerate * 5 / 2;
|
|
case 2:
|
|
sh->sample_format = AF_FORMAT_S24_BE;
|
|
sh->samplesize = 3;
|
|
break;
|
|
default:
|
|
sh->sample_format = AF_FORMAT_S16_BE;
|
|
sh->samplesize = 2;
|
|
}
|
|
} else {
|
|
// use defaults:
|
|
sh->channels=2;
|
|
sh->samplerate=48000;
|
|
sh->sample_format = AF_FORMAT_S16_BE;
|
|
sh->samplesize = 2;
|
|
}
|
|
if (!sh->i_bps)
|
|
sh->i_bps = sh->samplesize * sh->channels * sh->samplerate;
|
|
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)
|
|
{
|
|
int j,len;
|
|
if (sh_audio->samplesize == 3) {
|
|
if (((sh_audio->codecdata[1] >> 6) & 3) == 1) {
|
|
// 20 bit
|
|
// not sure if the "& 0xf0" and "<< 4" are the right way around
|
|
// can somebody clarify?
|
|
for (j = 0; j < minlen; j += 12) {
|
|
char tmp[10];
|
|
len = demux_read_data(sh_audio->ds, tmp, 10);
|
|
if (len < 10) break;
|
|
// first sample
|
|
buf[j + 0] = tmp[0];
|
|
buf[j + 1] = tmp[1];
|
|
buf[j + 2] = tmp[8] & 0xf0;
|
|
// second sample
|
|
buf[j + 3] = tmp[2];
|
|
buf[j + 4] = tmp[3];
|
|
buf[j + 5] = tmp[8] << 4;
|
|
// third sample
|
|
buf[j + 6] = tmp[4];
|
|
buf[j + 7] = tmp[5];
|
|
buf[j + 8] = tmp[9] & 0xf0;
|
|
// fourth sample
|
|
buf[j + 9] = tmp[6];
|
|
buf[j + 10] = tmp[7];
|
|
buf[j + 11] = tmp[9] << 4;
|
|
}
|
|
len = j;
|
|
} else {
|
|
// 24 bit
|
|
for (j = 0; j < minlen; j += 12) {
|
|
char tmp[12];
|
|
len = demux_read_data(sh_audio->ds, tmp, 12);
|
|
if (len < 12) break;
|
|
// first sample
|
|
buf[j + 0] = tmp[0];
|
|
buf[j + 1] = tmp[1];
|
|
buf[j + 2] = tmp[8];
|
|
// second sample
|
|
buf[j + 3] = tmp[2];
|
|
buf[j + 4] = tmp[3];
|
|
buf[j + 5] = tmp[9];
|
|
// third sample
|
|
buf[j + 6] = tmp[4];
|
|
buf[j + 7] = tmp[5];
|
|
buf[j + 8] = tmp[10];
|
|
// fourth sample
|
|
buf[j + 9] = tmp[6];
|
|
buf[j + 10] = tmp[7];
|
|
buf[j + 11] = tmp[11];
|
|
}
|
|
len = j;
|
|
}
|
|
} else
|
|
len=demux_read_data(sh_audio->ds,buf,(minlen+3)&(~3));
|
|
return len;
|
|
}
|