mirror of https://github.com/mpv-player/mpv
138 lines
2.9 KiB
C
138 lines
2.9 KiB
C
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// liba52 sample by A'rpi/ESP-team
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// reads ac3 stream form stdin, decodes and downmix to s16 stereo pcm and
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// writes it to stdout. resulting stream playbackable with sox:
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// play -c 2 -r 48000 out.sw
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//#define TIMING //needs Pentium or newer
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#include <stdio.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include <string.h>
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#include "a52.h"
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#include "mm_accel.h"
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#include "../cpudetect.h"
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static sample_t * samples;
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static a52_state_t state;
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static uint8_t buf[3840];
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static int buf_size=0;
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static int16_t out_buf[6*256*6];
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void mp_msg_c( int x, const char *format, ... ) // stub for cpudetect.c
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{
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}
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#ifdef TIMING
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static inline long long rdtsc()
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{
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long long l;
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asm volatile( "rdtsc\n\t"
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: "=A" (l)
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);
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// printf("%d\n", int(l/1000));
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return l;
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}
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#define STARTTIMING t=rdtsc();
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#define ENDTIMING sum+=rdtsc()-t; t=rdtsc();
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#else
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#define STARTTIMING ;
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#define ENDTIMING ;
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#endif
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int main(){
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int accel=0;
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int sample_rate=0;
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int bit_rate=0;
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#ifdef TIMING
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long long t, sum=0, min=256*256*256*64;
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#endif
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FILE *temp= stdout;
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stdout= stderr; //EVIL HACK FIXME
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GetCpuCaps(&gCpuCaps);
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stdout= temp;
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// gCpuCaps.hasMMX=0;
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// gCpuCaps.hasSSE=0;
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if(gCpuCaps.hasMMX) accel |= MM_ACCEL_X86_MMX;
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if(gCpuCaps.hasMMX2) accel |= MM_ACCEL_X86_MMXEXT;
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if(gCpuCaps.hasSSE) accel |= MM_ACCEL_X86_SSE;
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if(gCpuCaps.has3DNow) accel |= MM_ACCEL_X86_3DNOW;
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// if(gCpuCaps.has3DNowExt) accel |= MM_ACCEL_X86_3DNOWEXT;
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samples = a52_init (accel);
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if (samples == NULL) {
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fprintf (stderr, "A52 init failed\n");
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return 1;
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}
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while(1){
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int length,i;
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int16_t *s16;
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sample_t level=1, bias=384;
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int flags=0;
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int channels=0;
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while(buf_size<7){
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int c=getchar();
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if(c<0) goto eof;
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buf[buf_size++]=c;
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}
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STARTTIMING
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length = a52_syncinfo (buf, &flags, &sample_rate, &bit_rate);
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ENDTIMING
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if(!length){
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// bad file => resync
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memcpy(buf,buf+1,6);
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--buf_size;
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continue;
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}
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fprintf(stderr,"sync. %d bytes 0x%X %d Hz %d kbit\n",length,flags,sample_rate,bit_rate);
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while(buf_size<length){
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buf[buf_size++]=getchar();
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}
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buf_size=0;
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// decode:
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flags=A52_STEREO; //A52_STEREO; //A52_DOLBY; //A52_STEREO; // A52_DOLBY // A52_2F2R // A52_3F2R | A52_LFE
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channels=2;
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flags |= A52_ADJUST_LEVEL;
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STARTTIMING
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if (a52_frame (&state, buf, &flags, &level, bias))
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{ fprintf(stderr,"error at decoding\n"); continue; }
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ENDTIMING
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// a52_dynrng (&state, NULL, NULL); // disable dynamic range compensation
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STARTTIMING
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a52_resample_init(accel,flags,channels);
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s16 = out_buf;
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for (i = 0; i < 6; i++) {
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if (a52_block (&state, samples))
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{ fprintf(stderr,"error at sampling\n"); break; }
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// float->int + channels interleaving:
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s16+=a52_resample(samples,s16);
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ENDTIMING
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}
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#ifdef TIMING
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if(sum<min) min=sum;
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sum=0;
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#endif
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fwrite(out_buf,6*256*2*channels,1,stdout);
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}
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eof:
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#ifdef TIMING
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fprintf(stderr, "%4.4fk cycles ",min/1000.0);
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sum=0;
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#endif
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}
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