Author: michael Date: Fri Nov 3 14:52:12 2006 New Revision: 20634 Modified: trunk/DOCS/tech/nut.txt Log: move file up so its found first, this probably improves readability Modified: trunk/DOCS/tech/nut.txt ============================================================================== --- trunk/DOCS/tech/nut.txt (original) +++ trunk/DOCS/tech/nut.txt Fri Nov 3 14:52:12 2006 @@ -116,6 +116,54 @@ Bitstream syntax: ================= +file: + file_id_string + while(!eof){ + if(next_byte == 'N'){ + packet_header + switch(startcode){ + case main_startcode: main_header; break; + case stream_startcode:stream_header; break; + case info_startcode: info_packet; break; + case index_startcode: index; break; + case syncpoint_startcode: syncpoint; break; + } + packet_footer + }else + frame + } + +the structure of a undamaged file should look like the following, but +demuxers should be flexible and be able to deal with damaged headers so the +above is a better loop in practice (not to mention its simpler) +note, demuxers MUST be able to deal with new and unknown headers + +file: + file_id_string + while(!eof){ + packet_header, main_header, packet_footer + reserved_headers + for(i=0; i<stream_count; i++){ + packet_header, stream_header, packet_footer + reserved_headers + } + while(next_code == info_startcode){ + packet_header, info_packet, packet_footer + reserved_headers + } + if(next_code == index_startcode){ + packet_header, index_packet, packet_footer + } + if (!eof) while(next_code != main_startcode){ + if(next_code == syncpoint_startcode){ + packet_header, syncpoint, packet_footer + } + frame + reserved_headers + } + } + + Common elements: ---------------- @@ -319,53 +367,6 @@ Complete definition: -file: - file_id_string - while(!eof){ - if(next_byte == 'N'){ - packet_header - switch(startcode){ - case main_startcode: main_header; break; - case stream_startcode:stream_header; break; - case info_startcode: info_packet; break; - case index_startcode: index; break; - case syncpoint_startcode: syncpoint; break; - } - packet_footer - }else - frame - } - -the structure of a undamaged file should look like the following, but -demuxers should be flexible and be able to deal with damaged headers so the -above is a better loop in practice (not to mention its simpler) -note, demuxers MUST be able to deal with new and unknown headers - -file: - file_id_string - while(!eof){ - packet_header, main_header, packet_footer - reserved_headers - for(i=0; i<stream_count; i++){ - packet_header, stream_header, packet_footer - reserved_headers - } - while(next_code == info_startcode){ - packet_header, info_packet, packet_footer - reserved_headers - } - if(next_code == index_startcode){ - packet_header, index_packet, packet_footer - } - if (!eof) while(next_code != main_startcode){ - if(next_code == syncpoint_startcode){ - packet_header, syncpoint, packet_footer - } - frame - reserved_headers - } - } - Tag description: ----------------