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/*
* liba52 sample by A'rpi/ESP-team
* Reads an AC-3 stream from stdin, decodes and downmixes to s16 stereo PCM
* and writes it to stdout. The resulting stream is playable with sox:
* play -c2 -r48000 -sw -fs out.sw
*
* Copyright (C) 2001 Árpád Gereöffy
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
//#define TIMING //needs Pentium or newer
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include "a52.h"
#include "mm_accel.h"
#include "../cpudetect.h"
static a52_state_t *state;
static uint8_t buf[3840];
static int buf_size=0;
static int16_t out_buf[6*256*6];
void mp_msg( int x, const char *format, ... ) // stub for cpudetect.c
{
}
#ifdef TIMING
static inline long long rdtsc()
{
long long l;
asm volatile( "rdtsc\n\t"
: "=A" (l)
);
// printf("%d\n", int(l/1000));
return l;
}
#define STARTTIMING t=rdtsc();
#define ENDTIMING sum+=rdtsc()-t; t=rdtsc();
#else
#define STARTTIMING ;
#define ENDTIMING ;
#endif
int main(void){
int accel=0;
int sample_rate=0;
int bit_rate=0;
#ifdef TIMING
long long t, sum=0, min=256*256*256*64;
#endif
FILE *temp= stdout;
stdout= stderr; //EVIL HACK FIXME
GetCpuCaps(&gCpuCaps);
stdout= temp;
// gCpuCaps.hasMMX=0;
// gCpuCaps.hasSSE=0;
if(gCpuCaps.hasMMX) accel |= MM_ACCEL_X86_MMX;
if(gCpuCaps.hasMMX2) accel |= MM_ACCEL_X86_MMXEXT;
if(gCpuCaps.hasSSE) accel |= MM_ACCEL_X86_SSE;
if(gCpuCaps.has3DNow) accel |= MM_ACCEL_X86_3DNOW;
// if(gCpuCaps.has3DNowExt) accel |= MM_ACCEL_X86_3DNOWEXT;
state = a52_init (accel);
if (state == NULL) {
fprintf (stderr, "A52 init failed\n");
return 1;
}
while(1){
int length,i;
int16_t *s16;
sample_t level=1, bias=384;
int flags=0;
int channels=0;
while(buf_size<7){
int c=getchar();
if(c<0) goto eof;
buf[buf_size++]=c;
}
STARTTIMING
length = a52_syncinfo (buf, &flags, &sample_rate, &bit_rate);
ENDTIMING
if(!length){
// bad file => resync
memcpy(buf,buf+1,6);
--buf_size;
continue;
}
fprintf(stderr,"sync. %d bytes 0x%X %d Hz %d kbit\n",length,flags,sample_rate,bit_rate);
while(buf_size<length){
buf[buf_size++]=getchar();
}
buf_size=0;
// decode:
flags=A52_STEREO; //A52_STEREO; //A52_DOLBY; //A52_STEREO; // A52_DOLBY // A52_2F2R // A52_3F2R | A52_LFE
channels=2;
flags |= A52_ADJUST_LEVEL;
STARTTIMING
if (a52_frame (state, buf, &flags, &level, bias))
{ fprintf(stderr,"error at decoding\n"); continue; }
ENDTIMING
// a52_dynrng (state, NULL, NULL); // disable dynamic range compensation
STARTTIMING
a52_resample_init(accel,flags,channels);
s16 = out_buf;
for (i = 0; i < 6; i++) {
if (a52_block (state))
{ fprintf(stderr,"error at sampling\n"); break; }
// float->int + channels interleaving:
s16+=a52_resample(a52_samples(state),s16);
ENDTIMING
}
#ifdef TIMING
if(sum<min) min=sum;
sum=0;
#endif
fwrite(out_buf,6*256*2*channels,1,stdout);
}
eof:
#ifdef TIMING
fprintf(stderr, "%4.4fk cycles\n",min/1000.0);
sum=0;
#endif
return 0;
}
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