// return: packet length int read_video_packet(demux_stream_t *ds){ int packet_start; int res, read; 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]=0; videobuffer[videobuf_len+1]=0; videobuffer[videobuf_len+2]=1; videobuffer[videobuf_len+3]=next_nal; videobuf_len+=4; // READ PACKET: res = demux_pattern_3(ds, &videobuffer[videobuf_len], VIDEOBUFFER_SIZE - videobuf_len, &read, 0x100); videobuf_len += read; if (!res) goto eof_out; videobuf_len-=3; 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: next_nal = demux_getc(ds); if (next_nal < 0) goto eof_out; videobuf_code_len=4; return videobuf_len-packet_start; eof_out: next_nal = -1; videobuf_code_len = 0; return videobuf_len - packet_start; }
// sync video stream, and returns next packet code int sync_video_packet(demux_stream_t *ds){ if (!videobuf_code_len) { int skipped=0; if (!demux_pattern_3(ds, NULL, MAX_SYNCLEN, &skipped, 0x100)) { if (skipped == MAX_SYNCLEN) mp_msg(MSGT_DEMUXER, MSGL_ERR, "parse_es: could not sync video stream!\n"); goto eof_out; } next_nal = demux_getc(ds); if (next_nal < 0) goto eof_out; videobuf_code_len = 4; if(skipped) mp_dbg(MSGT_PARSEES,MSGL_DBG2,"videobuf: %d bytes skipped (next: 0x1%02X)\n",skipped,next_nal); } return 0x100|next_nal; eof_out: next_nal = -1; videobuf_code_len = 0; return 0; }