mirror of https://github.com/mpv-player/mpv
238 lines
7.0 KiB
C
238 lines
7.0 KiB
C
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <math.h>
|
|
|
|
#include "config.h"
|
|
#ifdef USE_LIBA52
|
|
|
|
#include "mp_msg.h"
|
|
#include "help_mp.h"
|
|
|
|
#include "ad_internal.h"
|
|
|
|
#include "cpudetect.h"
|
|
|
|
#include "../liba52/a52.h"
|
|
#include "../liba52/mm_accel.h"
|
|
|
|
static sample_t * a52_samples;
|
|
static a52_state_t a52_state;
|
|
static uint32_t a52_flags=0;
|
|
|
|
#define DRC_NO_ACTION 0
|
|
#define DRC_NO_COMPRESSION 1
|
|
#define DRC_CALLBACK 2
|
|
|
|
float a52_drc_level = 1.0;
|
|
static int a52_drc_action = DRC_NO_ACTION;
|
|
|
|
#include "bswap.h"
|
|
|
|
static ad_info_t info =
|
|
{
|
|
"AC3 decoding with liba52",
|
|
"liba52",
|
|
"Nick Kurshev",
|
|
"Michel LESPINASSE",
|
|
""
|
|
};
|
|
|
|
LIBAD_EXTERN(liba52)
|
|
|
|
extern int audio_output_channels;
|
|
|
|
int a52_fillbuff(sh_audio_t *sh_audio){
|
|
int length=0;
|
|
int flags=0;
|
|
int sample_rate=0;
|
|
int bit_rate=0;
|
|
|
|
sh_audio->a_in_buffer_len=0;
|
|
/* sync frame:*/
|
|
while(1){
|
|
while(sh_audio->a_in_buffer_len<8){
|
|
int c=demux_getc(sh_audio->ds);
|
|
if(c<0) return -1; /* EOF*/
|
|
sh_audio->a_in_buffer[sh_audio->a_in_buffer_len++]=c;
|
|
}
|
|
if(sh_audio->format!=0x2000) swab(sh_audio->a_in_buffer,sh_audio->a_in_buffer,8);
|
|
length = a52_syncinfo (sh_audio->a_in_buffer, &flags, &sample_rate, &bit_rate);
|
|
if(length>=7 && length<=3840) break; /* we're done.*/
|
|
/* bad file => resync*/
|
|
if(sh_audio->format!=0x2000) swab(sh_audio->a_in_buffer,sh_audio->a_in_buffer,8);
|
|
memcpy(sh_audio->a_in_buffer,sh_audio->a_in_buffer+1,7);
|
|
--sh_audio->a_in_buffer_len;
|
|
}
|
|
mp_msg(MSGT_DECAUDIO,MSGL_DBG2,"a52: len=%d flags=0x%X %d Hz %d bit/s\n",length,flags,sample_rate,bit_rate);
|
|
sh_audio->samplerate=sample_rate;
|
|
sh_audio->i_bps=bit_rate/8;
|
|
sh_audio->samplesize=2;
|
|
demux_read_data(sh_audio->ds,sh_audio->a_in_buffer+8,length-8);
|
|
if(sh_audio->format!=0x2000)
|
|
swab(sh_audio->a_in_buffer+8,sh_audio->a_in_buffer+8,length-8);
|
|
|
|
if(crc16_block(sh_audio->a_in_buffer+2,length-2)!=0)
|
|
mp_msg(MSGT_DECAUDIO,MSGL_STATUS,"a52: CRC check failed! \n");
|
|
|
|
return length;
|
|
}
|
|
|
|
/* returns: number of available channels*/
|
|
static int a52_printinfo(sh_audio_t *sh_audio){
|
|
int flags, sample_rate, bit_rate;
|
|
char* mode="unknown";
|
|
int channels=0;
|
|
a52_syncinfo (sh_audio->a_in_buffer, &flags, &sample_rate, &bit_rate);
|
|
switch(flags&A52_CHANNEL_MASK){
|
|
case A52_CHANNEL: mode="channel"; channels=2; break;
|
|
case A52_MONO: mode="mono"; channels=1; break;
|
|
case A52_STEREO: mode="stereo"; channels=2; break;
|
|
case A52_3F: mode="3f";channels=3;break;
|
|
case A52_2F1R: mode="2f+1r";channels=3;break;
|
|
case A52_3F1R: mode="3f+1r";channels=4;break;
|
|
case A52_2F2R: mode="2f+2r";channels=4;break;
|
|
case A52_3F2R: mode="3f+2r";channels=5;break;
|
|
case A52_CHANNEL1: mode="channel1"; channels=2; break;
|
|
case A52_CHANNEL2: mode="channel2"; channels=2; break;
|
|
case A52_DOLBY: mode="dolby"; channels=2; break;
|
|
}
|
|
mp_msg(MSGT_DECAUDIO,MSGL_INFO,"AC3: %d.%d (%s%s) %d Hz %3.1f kbit/s\n",
|
|
channels, (flags&A52_LFE)?1:0,
|
|
mode, (flags&A52_LFE)?"+lfe":"",
|
|
sample_rate, bit_rate*0.001f);
|
|
return (flags&A52_LFE) ? (channels+1) : channels;
|
|
}
|
|
|
|
sample_t dynrng_call (sample_t c, void *data) {
|
|
// fprintf(stderr, "(%lf, %lf): %lf\n", (double)c, (double)a52_drc_level, (double)pow((double)c, a52_drc_level));
|
|
return pow((double)c, a52_drc_level);
|
|
}
|
|
|
|
|
|
static int preinit(sh_audio_t *sh)
|
|
{
|
|
/* Dolby AC3 audio: */
|
|
/* however many channels, 2 bytes in a word, 256 samples in a block, 6 blocks in a frame */
|
|
sh->audio_out_minsize=audio_output_channels*2*256*6;
|
|
sh->audio_in_minsize=3840;
|
|
return 1;
|
|
}
|
|
|
|
static int init(sh_audio_t *sh_audio)
|
|
{
|
|
uint32_t a52_accel=0;
|
|
sample_t level=1, bias=384;
|
|
int flags=0;
|
|
/* Dolby AC3 audio:*/
|
|
if(gCpuCaps.hasSSE) a52_accel|=MM_ACCEL_X86_SSE;
|
|
if(gCpuCaps.hasMMX) a52_accel|=MM_ACCEL_X86_MMX;
|
|
if(gCpuCaps.hasMMX2) a52_accel|=MM_ACCEL_X86_MMXEXT;
|
|
if(gCpuCaps.has3DNow) a52_accel|=MM_ACCEL_X86_3DNOW;
|
|
if(gCpuCaps.has3DNowExt) a52_accel|=MM_ACCEL_X86_3DNOWEXT;
|
|
if(gCpuCaps.hasAltiVec) a52_accel|=MM_ACCEL_PPC_ALTIVEC;
|
|
a52_samples=a52_init (a52_accel);
|
|
if (a52_samples == NULL) {
|
|
mp_msg(MSGT_DECAUDIO,MSGL_ERR,"A52 init failed\n");
|
|
return 0;
|
|
}
|
|
if(a52_fillbuff(sh_audio)<0){
|
|
mp_msg(MSGT_DECAUDIO,MSGL_ERR,"A52 sync failed\n");
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Init a52 dynrng */
|
|
if (a52_drc_level < 0.001) {
|
|
/* level == 0 --> no compression, init library without callback */
|
|
a52_drc_action = DRC_NO_COMPRESSION;
|
|
} else if (a52_drc_level > 0.999) {
|
|
/* level == 1 --> full compression, do nothing at all (library default = full compression) */
|
|
a52_drc_action = DRC_NO_ACTION;
|
|
} else {
|
|
a52_drc_action = DRC_CALLBACK;
|
|
}
|
|
/* Library init for dynrng has to be done for each frame, see decode_audio() */
|
|
|
|
|
|
/* 'a52 cannot upmix' hotfix:*/
|
|
a52_printinfo(sh_audio);
|
|
sh_audio->channels=audio_output_channels;
|
|
while(sh_audio->channels>0){
|
|
switch(sh_audio->channels){
|
|
case 1: a52_flags=A52_MONO; break;
|
|
/* case 2: a52_flags=A52_STEREO; break;*/
|
|
case 2: a52_flags=A52_DOLBY; break;
|
|
/* case 3: a52_flags=A52_3F; break;*/
|
|
case 3: a52_flags=A52_2F1R; break;
|
|
case 4: a52_flags=A52_2F2R; break; /* 2+2*/
|
|
case 5: a52_flags=A52_3F2R; break;
|
|
case 6: a52_flags=A52_3F2R|A52_LFE; break; /* 5.1*/
|
|
}
|
|
/* test:*/
|
|
flags=a52_flags|A52_ADJUST_LEVEL;
|
|
mp_msg(MSGT_DECAUDIO,MSGL_V,"A52 flags before a52_frame: 0x%X\n",flags);
|
|
if (a52_frame (&a52_state, sh_audio->a_in_buffer, &flags, &level, bias)){
|
|
mp_msg(MSGT_DECAUDIO,MSGL_ERR,"a52: error decoding frame -> nosound\n");
|
|
return 0;
|
|
}
|
|
mp_msg(MSGT_DECAUDIO,MSGL_V,"A52 flags after a52_frame: 0x%X\n",flags);
|
|
/* frame decoded, let's init resampler:*/
|
|
if(a52_resample_init(a52_accel,flags,sh_audio->channels)) break;
|
|
--sh_audio->channels; /* try to decrease no. of channels*/
|
|
}
|
|
if(sh_audio->channels<=0){
|
|
mp_msg(MSGT_DECAUDIO,MSGL_ERR,"a52: no resampler. try different channel setup!\n");
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static void uninit(sh_audio_t *sh)
|
|
{
|
|
}
|
|
|
|
static int control(sh_audio_t *sh,int cmd,void* arg, ...)
|
|
{
|
|
switch(cmd)
|
|
{
|
|
case ADCTRL_SKIP_FRAME:
|
|
a52_fillbuff(sh); break; // skip AC3 frame
|
|
return CONTROL_TRUE;
|
|
}
|
|
return CONTROL_UNKNOWN;
|
|
}
|
|
|
|
static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
|
|
{
|
|
sample_t level=1, bias=384;
|
|
int flags=a52_flags|A52_ADJUST_LEVEL;
|
|
int i,len=-1;
|
|
if(!sh_audio->a_in_buffer_len)
|
|
if(a52_fillbuff(sh_audio)<0) return len; /* EOF */
|
|
sh_audio->a_in_buffer_len=0;
|
|
if (a52_frame (&a52_state, sh_audio->a_in_buffer, &flags, &level, bias)){
|
|
mp_msg(MSGT_DECAUDIO,MSGL_WARN,"a52: error decoding frame\n");
|
|
return len;
|
|
}
|
|
|
|
/* handle dynrng */
|
|
if (a52_drc_action != DRC_NO_ACTION) {
|
|
if (a52_drc_action == DRC_NO_COMPRESSION)
|
|
a52_dynrng(&a52_state, NULL, NULL);
|
|
else
|
|
a52_dynrng(&a52_state, dynrng_call, NULL);
|
|
}
|
|
|
|
len=0;
|
|
for (i = 0; i < 6; i++) {
|
|
if (a52_block (&a52_state, a52_samples)){
|
|
mp_msg(MSGT_DECAUDIO,MSGL_WARN,"a52: error at resampling\n");
|
|
break;
|
|
}
|
|
len+=2*a52_resample(a52_samples,(int16_t *)&buf[len]);
|
|
}
|
|
return len;
|
|
}
|
|
#endif
|