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// liba52 sample by A'rpi/ESP-team
// reads ac3 stream form stdin, decodes and downmix to s16 stereo pcm and
// writes it to stdout. resulting stream playbackable with sox:
// play -c 2 -r 48000 out.sw
//#define TIMING //needs Pentium or newer
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
#include "a52.h"
#include "../cpudetect.h"
static sample_t * samples;
static a52_state_t state;
static uint8_t buf[3840];
static int buf_size=0;
static int16_t out_buf[6*256*6];
#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(){
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;
samples = a52_init (accel);
if (samples == 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_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(flags,channels);
s16 = out_buf;
for (i = 0; i < 6; i++) {
if (a52_block (&state, samples))
{ fprintf(stderr,"error at sampling\n"); break; }
// float->int + channels interleaving:
s16+=a52_resample(samples,s16);
ENDTIMING
}
#ifdef TIMING
if(sum<min) min=sum;
sum=0;
#endif
fwrite(out_buf,6*256*2*2,1,stdout);
}
eof:
#ifdef TIMING
fprintf(stderr, "%4.4fk cycles ",min/1000.0);
sum=0;
#endif
}
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