common.c

从 IEEE 1394总线接收传输流

/* this file from mpg123 was adapted for mpeg2ts1394dec. Not needed stuff is eliminated */
#include <ctype.h>
#include <stdlib.h>
#include <signal.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>

#include <fcntl.h>

#ifdef READ_MMAP
#include <sys/mman.h>
#ifndef MAP_FAILED
#define MAP_FAILED ( (void *) -1 )
#endif
#endif

#include "mpg123.h"
/* #include "genre.h" */
#include "common.h"

int tabsel_123[2][3][16] = {
   { {0,32,64,96,128,160,192,224,256,288,320,352,384,416,448,},
     {0,32,48,56, 64, 80, 96,112,128,160,192,224,256,320,384,},
     {0,32,40,48, 56, 64, 80, 96,112,128,160,192,224,256,320,} },

   { {0,32,48,56,64,80,96,112,128,144,160,176,192,224,256,},
     {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,},
     {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,} }
};

long freqs[9] = { 44100, 48000, 32000, 22050, 24000, 16000 , 11025 , 12000 , 8000 };

/* these 5 variables must be set before playing a frame */

struct bitstream_info bsi;
unsigned char *bsbuf, *bsbufold;
int fsizeold=0,ssize;

/* this is needed for audio_oss; it was in buffer.c, but we don't use this here */
int outburst = MAXOUTBURST;

unsigned char *pcm_sample;
int pcm_point = 0;
int audiobufsize = AUDIOBUFSIZE;

void audio_flush(int outmode, struct audio_info_struct *ai)
{
	if (pcm_point) {
		audio_play_samples (ai, pcm_sample, pcm_point);
		pcm_point = 0;
	}
}

#if !defined(WIN32) && !defined(GENERIC)
void (*catchsignal(int signum, void(*handler)()))()
{
  struct sigaction new_sa;
  struct sigaction old_sa;

#ifdef DONT_CATCH_SIGNALS
  printf ("Not catching any signals.\n");
  return ((void (*)()) -1);
#endif

  new_sa.sa_handler = handler;
  sigemptyset(&new_sa.sa_mask);
  new_sa.sa_flags = 0;
  if (sigaction(signum, &new_sa, &old_sa) == -1)
    return ((void (*)()) -1);
  return (old_sa.sa_handler);
}
#endif

/*	is now in mpeg2demux.cpp
void read_frame_init (void)
{
    oldhead = 0;
    firsthead = 0;
}

int head_check(unsigned long head)
{
    if( (head & 0xffe00000) != 0xffe00000)
	return FALSE;
    if(!((head>>17)&3))
	return FALSE;
    if( ((head>>12)&0xf) == 0xf)
	return FALSE;
    if( ((head>>10)&0x3) == 0x3 )
	return FALSE;
    if ((head & 0xffff0000) == 0xfffe0000)
      return FALSE;

    return TRUE;
}
*/

void set_pointer(long backstep)
{
  bsi.wordpointer = bsbuf + ssize - backstep;
  if (backstep)
    memcpy(bsi.wordpointer,bsbufold+fsizeold-backstep,backstep);
  bsi.bitindex = 0; 
}