mirror of
https://github.com/mpv-player/mpv
synced 2024-12-09 16:36:15 +00:00
9ee7852bb7
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@2556 b3059339-0415-0410-9bf9-f77b7e298cf2
115 lines
2.9 KiB
C
115 lines
2.9 KiB
C
//=================== MPEG-ES VIDEO PARSER =========================
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
#include "config.h"
|
|
#include "mp_msg.h"
|
|
#include "help_mp.h"
|
|
|
|
#include "stream.h"
|
|
#include "demuxer.h"
|
|
#include "parse_es.h"
|
|
|
|
//static unsigned char videobuffer[MAX_VIDEO_PACKET_SIZE];
|
|
unsigned char* videobuffer=NULL;
|
|
int videobuf_len=0;
|
|
unsigned char videobuf_code[4];
|
|
int videobuf_code_len=0;
|
|
|
|
// sync video stream, and returns next packet code
|
|
int sync_video_packet(demux_stream_t *ds){
|
|
int skipped=0;
|
|
// we need enough bytes in the buffer:
|
|
while(videobuf_code_len<4){
|
|
#if 0
|
|
int c;
|
|
c=demux_getc(ds);if(c<0){ return 0;} // EOF
|
|
videobuf_code[videobuf_code_len++]=c;
|
|
#else
|
|
videobuf_code[videobuf_code_len++]=demux_getc(ds);
|
|
#endif
|
|
}
|
|
// sync packet:
|
|
while(1){
|
|
int c;
|
|
if(videobuf_code[0]==0 &&
|
|
videobuf_code[1]==0 &&
|
|
videobuf_code[2]==1) break; // synced
|
|
// shift buffer, drop first byte
|
|
++skipped;
|
|
videobuf_code[0]=videobuf_code[1];
|
|
videobuf_code[1]=videobuf_code[2];
|
|
videobuf_code[2]=videobuf_code[3];
|
|
c=demux_getc(ds);if(c<0){ return 0;} // EOF
|
|
videobuf_code[3]=c;
|
|
}
|
|
if(skipped) mp_dbg(MSGT_PARSEES,MSGL_DBG2,"videobuf: %d bytes skipped (next: 0x1%02X)\n",skipped,videobuf_code[3]);
|
|
return 0x100|videobuf_code[3];
|
|
}
|
|
|
|
// return: packet length
|
|
int read_video_packet(demux_stream_t *ds){
|
|
int packet_start;
|
|
|
|
// SYNC STREAM
|
|
// if(!sync_video_packet(ds)) return 0; // cannot sync (EOF)
|
|
|
|
// COPY STARTCODE:
|
|
packet_start=videobuf_len;
|
|
videobuffer[videobuf_len+0]=videobuf_code[0];
|
|
videobuffer[videobuf_len+1]=videobuf_code[1];
|
|
videobuffer[videobuf_len+2]=videobuf_code[2];
|
|
videobuffer[videobuf_len+3]=videobuf_code[3];
|
|
videobuf_len+=4;
|
|
|
|
// READ PACKET:
|
|
{ unsigned int head=-1;
|
|
while(videobuf_len<VIDEOBUFFER_SIZE){
|
|
int c=demux_getc(ds);
|
|
if(c<0) break; // EOF
|
|
videobuffer[videobuf_len++]=c;
|
|
#if 1
|
|
head<<=8;
|
|
if(head==0x100) break; // synced
|
|
head|=c;
|
|
#else
|
|
if(videobuffer[videobuf_len-4]==0 &&
|
|
videobuffer[videobuf_len-3]==0 &&
|
|
videobuffer[videobuf_len-2]==1) break; // synced
|
|
#endif
|
|
}
|
|
}
|
|
|
|
if(ds->eof){
|
|
videobuf_code_len=0; // EOF, no next code
|
|
return videobuf_len-packet_start;
|
|
}
|
|
|
|
videobuf_len-=4;
|
|
|
|
mp_dbg(MSGT_PARSEES,MSGL_DBG2,"videobuf: packet 0x1%02X len=%d (total=%d)\n",videobuffer[packet_start+3],videobuf_len-packet_start,videobuf_len);
|
|
|
|
// Save next packet code:
|
|
videobuf_code[0]=videobuffer[videobuf_len];
|
|
videobuf_code[1]=videobuffer[videobuf_len+1];
|
|
videobuf_code[2]=videobuffer[videobuf_len+2];
|
|
videobuf_code[3]=videobuffer[videobuf_len+3];
|
|
videobuf_code_len=4;
|
|
|
|
return videobuf_len-packet_start;
|
|
}
|
|
|
|
// return: next packet code
|
|
int skip_video_packet(demux_stream_t *ds){
|
|
|
|
// SYNC STREAM
|
|
// if(!sync_video_packet(ds)) return 0; // cannot sync (EOF)
|
|
|
|
videobuf_code_len=0; // force resync
|
|
|
|
// SYNC AGAIN:
|
|
return sync_video_packet(ds);
|
|
}
|