//=================== MPEG-ES VIDEO PARSER ========================= #include #include #include #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; if (VIDEOBUFFER_SIZE - videobuf_len < 5) return 0; // 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: { register uint32_t head = 0xffffffff; register unsigned char *buf = &videobuffer[VIDEOBUFFER_SIZE]; register int pos = videobuf_len - VIDEOBUFFER_SIZE; do { int c=demux_getc(ds); if(c<0) break; // EOF buf[pos]=c; head<<=8; if(head==0x100) break; // synced head|=c; } while (++pos); if (pos) pos++; // increment missed because of break videobuf_len = &buf[pos] - videobuffer; } 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); }