mirror of https://github.com/mpv-player/mpv
666 lines
18 KiB
Plaintext
666 lines
18 KiB
Plaintext
NUT Open Container Format DRAFT 20030906
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----------------------------------------
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Intro:
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Features / goals:
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(supported by the format, not necessary by a specific implementation)
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Simple
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use the same encoding for nearly all fields
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simple decoding, so slow cpus (and embedded systems) can handle it
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Extendible
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no limit for the possible values for all fields (using universal vlc)
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allow adding of new headers in the future
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allow adding more fields at the end of headers
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Compact
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~0.2% overhead, for normal bitrates
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index is <10kb per hour (1 keyframe every 3sec)
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a usual header for a file is about 100bytes (audio + video headers together)
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a packet header is about ~8 bytes
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Error resistant
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seeking / playback without an index
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headers & index can be repeated
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audio packet reshuffle
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checksums to allow quick redownloading of damaged parts
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damaged files can be played back with minimal data lost and fast
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resyncing times
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Definitions:
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MUST the specific part must be done to conform to this standard
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SHOULD its recommanded to be done that way but its not strictly required
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Syntax:
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Type definitions:
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v
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value=0
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do{
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more_data u(1)
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data u(7)
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value= 128*value + data
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}while(more_data)
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s
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temp v
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temp++
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if(temp&1) value= -(temp>>1)
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else value= (temp>>1)
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b (binary data or string)
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length v
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for(i=0; i<length; i++){
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data[i] u(8)
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}
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Note: strings MUST be encoded in utf8
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f(x) n fixed bits in big endian order
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u(x) unsigned number encoded in x bits in MSB first order
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Bitstream syntax:
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packet header
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forward ptr v
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backward ptr v
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align_byte
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while(not byte aligned)
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one f(1)
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reserved_bytes
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for(i=0; i<forward_ptr - length_of_non_reserved; i++)
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reserved u(8)
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a decoder MUST ignore any reserved bytes
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a encoder MUST NOT write any reserved bytes, as this would make it
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inpossible to add new fields at the end of packets in the future in
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a compatible way
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main header:
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main_startcode f(64)
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packet header
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version v
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stream_count v
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reserved_bytes
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checksum u(32)
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stream_header:
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stream_startcode f(64)
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packet_header
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stream_id v
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stream_class v
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fourcc b
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average_bitrate v
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language_code b
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time_base_nom v
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time_base_denom v
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msb_timestamp_shift v
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shuffle_type v
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fixed_fps u(1)
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index_flag u(1)
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reserved u(6)
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for(;;){
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codec_specific_data_type v
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if(codec_specific_data_type==0) break;
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codec_specific_data b
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}
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video_stream_header:
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stream_header
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width v
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height v
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sample_width v
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sample_height v
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colorspace_type v
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reserved_bytes
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checksum u(32)
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audio_stream_header:
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stream_header
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samplerate_mul v
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channel_count v
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reserved_bytes
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checksum u(32)
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frame
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if(keyframe){
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keyframe_startcode f(64)
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}
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zero_bit f(1)
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priority u(2)
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checksum_flag u(1)
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msb_timestamp_flag u(1)
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subpacket_type u(2)
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reserved u(1)
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packet header
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stream_id v
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if(msb_timestamp_flag)
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msb_timestamp v
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lsb_timestamp s
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if(sub_packet_type==01)
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sub_packet[0]
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else{
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subpacket_count v
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if(sub_packet_type&01)
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for(i=0; ; i++)
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keyframe_run[i] v
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for(i=0; ; i++){
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timestamp_diff[i] v
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if(timestamp_diff[i] & 1)
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timestamp_diff_run[i] v
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}
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if(sub_packet_type&10){
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for(i=0; i<subpacket_count-1; i++)
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subpacket_size_diff[i] s
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}
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for(i=0; i<subpacket_count; i++)
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subpacket[i]
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}
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}
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if(checksum_flag)
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frame_checksum u(32)
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Index:
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index_startcode f(64)
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packet header
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stream_id v
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index_length v
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for(i=0; i<index_length; i++){
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index_timestamp v
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index_position v
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}
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reserved_bytes
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checksum u(32)
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info_packet: (optional)
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info_startcode f(64)
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packet header
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for(;;){
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id v
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if(id==0) break
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name= info_table[id][0]
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type= info_table[id][1]
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if(type==NULL)
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type b
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if(name==NULL)
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name b
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if(type=="v")
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value v
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else if(type=="s")
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value s
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else
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value b
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}
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reserved_bytes
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checksum u(32)
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forward_ptr
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backward_ptr
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pointer to the next / previous packet
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pointers are relative and backward pointer is implicitelly negative
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Note: a frame with 0 bytes means that its skiped
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Note: the forward pointer is equal to the size of this packet including
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the header
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the backward pointer is equal to the size of the previous packet
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Example:
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0
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size1 (size of frame1 including header)
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frame1
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size1
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size2
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frame2
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size2
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size3
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frame3
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*_startcode
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the first bit is allways set
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version
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0 for now
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file_size
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size in bytes. 0 invalidates the field
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length_in_msec
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length of the file in milli seconds (0 invalidates the field)
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stream_id
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Note: streams with a lower relative class MUST have a lower relative id
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so a stream with class 0 MUST allways have a id which is lower then any
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stream with class > 0
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streams should use low ids
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stream_class
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0 video
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32 audio
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64 subtiles
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Note the remaining values are reserved and MUST NOT be used
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a decoder MUST ignore streams with reserved classes
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fourcc
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identification for the codec
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example: "H264"
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MUST contain 2 or 4 bytes, note, this might be increased in the future
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if needed
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language_code
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ISO 639 and ISO 3166 for language/country code
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something like "usen" (US english), can be 0
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if unknown
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see http://www.loc.gov/standards/iso639-2/englangn.html
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and http://www.din.de/gremien/nas/nabd/iso3166ma/codlstp1/en_listp1.html
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time_base_nom / time_base_denom = time_base
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the number of timer ticks per second, this MUST be equal to the fps
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if the fixed_fps is 1
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time_base_denom MUST not be 0
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time_base_nom and time_base_denom MUST be relative prime
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time_base_nom MUST be < 2^16
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examples:
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fps time_base_nom time_base_denom
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30 30 1
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29.97 30000 1001
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23.976 24000 1001
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sample_rate sample_rate_mul time_base_nom time_base_denom
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44100 1 44100 1
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44100 64 11025 16
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48000 1024 375 8
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Note: the advantage to using a large sample_rate_mul is that the
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timestamps need fewer bits
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msb_timestamp_shift
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amount of bits msb_timestamp is shifted left before adding lsb_timestamp
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MUST be <16
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fixed_fps
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1 indicates that the fps is fixed
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index_flag
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1 indicates that this file has an index
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Note, all files SHOULD have an index at the end except, (realtime) streams
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Note, all streams SHOULD have an index
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codec_specific_data_type
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0 none/end
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1 native
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2 bitmapinfoheader
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3 waveformatex
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4 imagedesc
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5 sounddesc
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"native", means a simple api & container independanet storage form,
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for example some mpeg4-es headers
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codec_specific_data
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private global data for a codec (could be huffman tables or ...)
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msb_timestamp_flag
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indicates that the msb_timestamp is coded
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MUST be 1 for keyframes
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subpacket_type
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subpacket_count subpacket_size keyframe_flag
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00 >1 constant constant
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01 1 NA NA
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10 >1 variable constant
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11 >1 variable variable
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the only legal subpacket_type for video streams is 01, so video streams
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MUST NOT contain multiple subpackets per packet
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Note, if there are multiple subpackets then the timestamp of the packet
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is the timestamp of the first subpacket
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Note, if multiple subpackets are stored in one frame then the resulting
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framesize SHOULD be < 16kbyte and not more then 0.5 sec of data SHOULD
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be put in a single packet
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subpacket_count
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the number of subpackets, if not pressent then 1
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keyframe_run[i]
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the number of subpackets with an identical keyframe_flag
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Note, the value of first flag is stored in the packet header
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is equal to subpacket count if not coded
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timestamp_diff[i]
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the difference from the last subpacket timestamp to the current one in
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time_base precission
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the lowwest bit is used to indicate if timestamp_diff_run[i] is coded
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timestamp_diff_run[i]
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the number of subpackets which have the same timestamp_diff
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if not coded than 1
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0 is forbidden
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subpacket_size_diff
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the difference between the predicted size of this subpacket and the
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actual size
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the predicted size is 64 for the first subpacket in a packet
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otherwise it is MAX(64, last_subpacket_size)
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the size of the last subpacket is not coded and is simply the space left
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Note a subpacket MUST be in exactly one packet, it cannot be split
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msb_timestamp
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most significant bits of the timestamp, SHOULD be 0 for the first frame
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lsb_timestamp
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difference from the msb_timestamp in time_base precission
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Example: IBBP display order
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keyframe msb_timestamp=0 lsb_timestamp=0 -> timestamp=0
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frame lsb_timestamp=3 -> timestamp=3
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frame lsb_timestamp=1 -> timestamp=1
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frame lsb_timestamp=2 -> timestamp=2
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...
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keyframe msb_timestamp=1 lsb_timestamp=1 -> timestamp=257
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frame lsb_timestamp=-1-> timestamp=255
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frame lsb_timestamp=0 -> timestamp=256
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frame lsb_timestamp=4 -> timestamp=260
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frame lsb_timestamp=2 -> timestamp=258
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frame lsb_timestamp=3 -> timestamp=259
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width/height
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MUST be set to the coded width/height
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sample_width/sample_height (aspect ratio)
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sample_width is the horizontal distance between samples
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sample_width and sample_height MUST be relative prime if not zero
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MUST be 0 if unknown
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colorspace_type
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0 unknown
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1 ITU Rec 624 / ITU Rec 601 Y range: 16..235 Cb/Cr range: 16..240
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2 ITU Rec 709 Y range: 16..235 Cb/Cr range: 16..240
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17 ITU Rec 624 / ITU Rec 601 Y range: 0..255 Cb/Cr range: 0..255
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18 ITU Rec 709 Y range: 0..255 Cb/Cr range: 0..255
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samplerate_mul
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the number of samples per second in one time_base unit
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samplerate = time_base*samplerate_mul
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zero_bit
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MUST be 0, its there to distinguish non keyframes from other packets,
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Note: all packets have a 64-bit startcode except non-keyframes to reduce
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their size, and all startcodes start with a 1 bit
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priority
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if 0 then the frame isnt used as reference (b frame) and can be droped
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MUST be > 0 for keyframes
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shuffle_type
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audio is often encoded in small subpackets, and to increase the
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error robustness these can be shuffled
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0 -> no shuffle
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1-16 -> interleave packets by 2^n
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checksum
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crc32 checksum using the generator polynomial 0x104c11db7 (same as ogg)
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checksum_flag
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indicates that the frame_checksum is coded
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must be 1 for the last non keyframe before a keyframe
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frame_checksum
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identical to checksum, but instead of covering just the current
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packet, it covers all frames of the same stream id since the last
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frame_checksum
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this field is only coded if checksum_flag=1
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index_timestamp
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value in time_base precission, relative to the last index_timestamp
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index_position
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position in bytes of the first byte of the keyframe header, relative
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to the last index_position
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id
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the id of the type/name pair, so its more compact
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0 means end
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type
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for example: "UTF8" -> String or "JPEG" -> jpeg image
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Note: nonstandard fields should be prefixed by "X-"
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Note: MUST be less than 6 byte long (might be increased to 64 later)
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name
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the name of the info entry, valid names are
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"TotalTime" total length of the stream in msecs
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"StreamId" the stream(s) to which the info packet applies
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"StartTimestamp"
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"EndTimestamp" the time range in msecs to which the info applies
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"SegmentId" a unique id for the streams + time specified
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"Author"
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"Description"
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"Copyright"
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"Encoder" the name & version of the software used for encoding
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"Title"
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"Cover" an image of the (cd,dvd,vhs,..) cover (preferable PNG or JPEG)
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"Source" "DVD", "VCD", "CD", "MD", "FM radio", "VHS", "TV",
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"LD"
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Optional: appended PAL,NTSC,SECAM, ... in parentheses
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"CaptureDevice" "BT878", "BT848", "webcam", ... (more exact names are fine too)
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"CreationTime" "2003-01-20 20:13:15Z", ...
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(ISO 8601 format, see http://www.cl.cam.ac.uk/~mgk25/iso-time.html)
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Note: dont forget the timezone
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"Keywords"
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Note: if someone needs some others, please tell us about them, so we can
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add them to the official standard (if they are sane)
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Note: nonstandard fields should be prefixed by "X-"
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Note: MUST be less than 64 bytes long
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value
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value of this name/type pair
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stuffing
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0x80 can be placed infront of any type v entry for stuffing
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purposes
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info_table[][2]={
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{NULL , NULL }, // end
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{NULL , NULL },
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{NULL , "UTF8"},
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{NULL , "v"},
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{NULL , "s"},
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{"StreamId" , "v"},
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{"SegmentId" , "v"},
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{"StartTimestamp" , "v"},
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{"EndTimestamp" , "v"},
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{"Author" , "UTF8"},
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{"Titel" , "UTF8"},
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{"Description" , "UTF8"},
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{"Copyright" , "UTF8"},
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{"Encoder" , "UTF8"},
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{"Keyword" , "UTF8"},
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{"Cover" , "JPEG"},
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{"Cover" , "PNG"},
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};
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Structure:
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the headers MUST be in exactly the following order (to simplify demuxer design)
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main header
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stream_header (id=0)
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stream_header (id=1)
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...
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stream_header (id=n)
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headers may be repated, but if they are then they MUST all be repeated together
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and repeated headers MUST be identical
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headers MUST be repeated every 10sec at least ? FIXME
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headers MUST be repeated BEFORE keyframes
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headers MUST be repeated at least twice (so they exist 3 times in a file)
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Index
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the index can be repeated but there SHOULD be at least one for each stream at
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the end
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Note: in case of realtime streaming there is no end, so no index there either
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Info packets
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the info_packet can be repeated, it can also contain different names & values
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each time but only if allso the time is different
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Info packets can be used to describe the file or some part of it (chapters)
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info packets, SHOULD be placed at the begin of the file at least
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for realtime streaming info packets will normally be transmitted when they apply
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for example, the current song title & artist of the currently shown music video
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Stuffing packets
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can be used as a filler, for example to leave some empty space at the begin for
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a copy of the index
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Unknown packets
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MUST be ignored by the decoder
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Sample code (GPL, & untested)
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typedef BufferContext{
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uint8_t *buf;
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uint8_t *buf_ptr;
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}BufferContext;
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static inline uint64_t get_bytes(BufferContext *bc, int count){
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uint64_t val=0;
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assert(count>0 && count<9)
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for(i=0; i<count; i++){
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val <<=8;
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val += *(bc->buf_ptr++);
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}
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return val;
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}
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static inline void put_bytes(BufferContext *bc, int count, uint64_t val){
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uint64_t val=0;
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assert(count>0 && count<9)
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for(i=count-1; i>=0; i--){
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*(bc->buf_ptr++)= val >> (8*i);
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}
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return val;
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}
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static inline uint64_t get_v(BufferContext *bc){
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uint64_t val= 0;
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for(; space_left(bc) > 0; ){
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int tmp= *(bc->buf_ptr++);
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if(tmp&0x80)
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val= (val<<7) + tmp - 0x80;
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else
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return (val<<7) + tmp;
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}
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return -1;
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}
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static inline int put_v(BufferContext *bc, uint64_t val){
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int i;
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if(space_left(bc) < 9) return -1;
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|
|
val &= 0x7FFFFFFFFFFFFFFFULL; // FIXME can only encode upto 63 bits currently
|
|
for(i=7; ; i+=7){
|
|
if(val>>i == 0) break;
|
|
}
|
|
|
|
for(i-=7; i>0; i-=7){
|
|
*(bc->buf_ptr++)= 0x80 | (val>>i);
|
|
}
|
|
*(bc->buf_ptr++)= val&0x7F;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int put_s(BufferContext *bc, uint64_t val){
|
|
if(val<=0) return put_v(bc, -2*val );
|
|
else return put_v(bc, 2*val-1);
|
|
}
|
|
|
|
static inline int64_t get_s(BufferContext *bc){
|
|
int64_t v= get_v(bc) + 1;
|
|
if(v&1) return -(v>>1);
|
|
else return (v>>1);
|
|
}
|
|
|
|
|
|
Example stream
|
|
|
|
main header
|
|
video_stream_header (stream 0, video jpjp, timebase 30, lsb_timestamp_length=8)
|
|
video_stream_header (stream 1 subtitle usen, timebase 30, lsb_timestamp_length=8)
|
|
video_stream_header (stream 2 subtitle atde, timebase 30, lsb_timestamp_length=8)
|
|
audio_stream_header (stream 3, audio jpjp, timebase 1 , lsb_timestamp_length=8)
|
|
audio_stream_header (stream 4, audio usen, timebase 1 , lsb_timestamp_length=8)
|
|
index (stream 0)
|
|
keyframe (stream 0, msb_timestamp=0, lsb_timestamp=0)
|
|
keyframe (stream 1, msb_timestamp=0, lsb_timestamp=0)
|
|
keyframe (stream 2, msb_timestamp=0, lsb_timestamp=0)
|
|
keyframe (stream 3, msb_timestamp=0, lsb_timestamp=0)
|
|
keyframe (stream 4, msb_timestamp=0, lsb_timestamp=0)
|
|
frame (stream 0, lsb_timestamp=1)
|
|
frame (stream 0, lsb_timestamp=2)
|
|
...
|
|
frame (stream 0, lsb_timestamp=30)
|
|
keyframe (stream 3, msb_timestamp=0, lsb_timestamp=1)
|
|
keyframe (stream 4, msb_timestamp=0, lsb_timestamp=1)
|
|
frame (stream 0, lsb_timestamp=31)
|
|
frame (stream 0, lsb_timestamp=32)
|
|
...
|
|
frame (stream 0, lsb_timestamp=60)
|
|
frame (stream 1, lsb_timestamp=60)
|
|
frame (stream 2, lsb_timestamp=60)
|
|
keyframe (stream 3, msb_timestamp=0, lsb_timestamp=2)
|
|
keyframe (stream 4, msb_timestamp=0, lsb_timestamp=2)
|
|
frame (stream 0, lsb_timestamp=61)
|
|
frame (stream 0, lsb_timestamp=62)
|
|
...
|
|
main header
|
|
video_stream_header (stream 0, video jpjp, timebase 30, lsb_timestamp_length=8)
|
|
video_stream_header (stream 1 subtitle usen, timebase 30, lsb_timestamp_length=8)
|
|
video_stream_header (stream 2 subtitle atde, timebase 30, lsb_timestamp_length=8)
|
|
audio_stream_header (stream 3, audio jpjp, timebase 1 , lsb_timestamp_length=8)
|
|
audio_stream_header (stream 4, audio usen, timebase 1 , lsb_timestamp_length=8)
|
|
frame (stream 0, lsb_timestamp=255)
|
|
frame (stream 0, msb_timestamp=1 lsb_timestamp=0)
|
|
frame (stream 0, lsb_timestamp=1)
|
|
frame (stream 0, lsb_timestamp=2)
|
|
frame (stream 1, msb_timestamp=1 lsb_timestamp=2)
|
|
frame (stream 2, msb_timestamp=1 lsb_timestamp=2)
|
|
frame (stream 0, lsb_timestamp=3)
|
|
frame (stream 0, lsb_timestamp=4)
|
|
...
|
|
keyframe (stream 3, msb_timestamp=0, lsb_timestamp=9)
|
|
keyframe (stream 4, msb_timestamp=0, lsb_timestamp=9)
|
|
main header
|
|
video_stream_header (stream 0, video jpjp, timebase 30, lsb_timestamp_length=8)
|
|
video_stream_header (stream 1 subtitle usen, timebase 30, lsb_timestamp_length=8)
|
|
video_stream_header (stream 2 subtitle atde, timebase 30, lsb_timestamp_length=8)
|
|
audio_stream_header (stream 3, audio jpjp, timebase 1 , lsb_timestamp_length=8)
|
|
audio_stream_header (stream 4, audio usen, timebase 1 , lsb_timestamp_length=8)
|
|
index (stream 0)
|
|
|
|
Authors
|
|
|
|
Folks from MPlayer Developers Mailinglist (http://www.mplayehrq.hu/).
|
|
Authors in ABC-order: (FIXME! Tell us if we left you out)
|
|
Beregszaszi, Alex (alex@fsn.hu)
|
|
Bunkus, Moritz (moritz@bunkus.org)
|
|
Diedrich, Tobias (td@sim.uni-hannover.de)
|
|
Franz, Fabian (FabianFranz@gmx.de)
|
|
Gereoffy, Arpad (arpi@thot.banki.hu)
|
|
Hess, Andreas (jaska@gmx.net)
|
|
Niedermayer, Michael (michaelni@gmx.at)
|