www.pudn.com > NETVIDEO.rar > seek.c

#include "../mpeg3private.h" 
#include "../mpeg3protos.h" 
#include "mpeg3video.h" 
#include  
#include  
 
unsigned int mpeg3bits_next_startcode(mpeg3_bits_t* stream) 
{ 
  /* Perform forwards search */ 
  mpeg3bits_byte_align(stream); 
 
 
//printf("mpeg3bits_next_startcode 1 %lld %lld\n",  
//	stream->demuxer->titles[0]->fs->current_byte,  
//	stream->demuxer->titles[0]->fs->total_bytes); 
 
 
//mpeg3_read_next_packet(stream->demuxer); 
//printf("mpeg3bits_next_startcode 2 %d %d\n",  
//	stream->demuxer->titles[0]->fs->current_byte,  
//	stream->demuxer->titles[0]->fs->total_bytes); 
 
/* Perform search */ 
  while(1) 
    { 
      unsigned int code = mpeg3bits_showbits32_noptr(stream); 
 
      //printf("mpeg3bits_next_startcode 2 %lx\n", code); 
      if((code >> 8) == MPEG3_PACKET_START_CODE_PREFIX) break; 
      if(mpeg3bits_eof(stream)) break; 
 
 
      mpeg3bits_getbyte_noptr(stream); 
 
      /* 
       * printf("mpeg3bits_next_startcode 3 %08x %d %d\n",  
       * 	mpeg3bits_showbits32_noptr(stream),  
       * 	stream->demuxer->titles[0]->fs->current_byte,  
       * 	stream->demuxer->titles[0]->fs->total_bytes); 
       */ 
    } 
  //printf("mpeg3bits_next_startcode 4 %d %d\n",  
  //	stream->demuxer->titles[0]->fs->current_byte,  
  //	stream->demuxer->titles[0]->fs->total_bytes); 
  return mpeg3bits_showbits32_noptr(stream); 
} 
#if 0 
/* Line up on the beginning of the next code. */ 
int mpeg3video_next_code(mpeg3_bits_t* stream, unsigned int code) 
{ 
  while(!mpeg3bits_eof(stream) &&  
	mpeg3bits_showbits32_noptr(stream) != code) 
    { 
      mpeg3bits_getbyte_noptr(stream); 
    } 
  return mpeg3bits_eof(stream); 
} 
#endif 
 
 
long mpeg3video_goptimecode_to_frame(mpeg3video_t *video) 
{ 
  /*  printf("mpeg3video_goptimecode_to_frame %d %d %d %d %f\n",  */ 
  /*  	video->gop_timecode.hour, video->gop_timecode.minute, video->gop_timecode.second, video->gop_timecode.frame, video->frame_rate); */ 
  return (long)(video->gop_timecode.hour * 3600 * video->frame_rate +  
		video->gop_timecode.minute * 60 * video->frame_rate + 
		video->gop_timecode.second * video->frame_rate + 
		video->gop_timecode.frame) - 1 - video->first_frame; 
} 
 
int mpeg3video_match_refframes(mpeg3video_t *video) 
{ 
  unsigned char *dst, *src; 
  int i, j, size; 
 
  for(i = 0; i < 3; i++) 
    { 
      if(video->newframe[i]) 
	{ 
	  if(video->newframe[i] == video->refframe[i]) 
	    { 
	      src = video->refframe[i]; 
	      dst = video->oldrefframe[i]; 
	    } 
	  else 
	    { 
	      src = video->oldrefframe[i]; 
	      dst = video->refframe[i]; 
	    } 
 
	  if(i == 0) 
	    size = video->coded_picture_width * video->coded_picture_height + 32 * video->coded_picture_width; 
	  else  
	    size = video->chrom_width * video->chrom_height + 32 * video->chrom_width; 
 
	  memcpy(dst, src, size); 
	} 
    } 
  return 0; 
}