mirror of https://github.com/mpv-player/mpv
Here is an updated draft with the bits discussed previously merged:
- short startcode removed - QT/Microsoft codec_specific_data removed, reverted to a neutral format - meta packet removed, merged in the info packet. - stream class simplified, added metadata stream patch by (Luca Barbato <lu_zero gentoo org>) git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@14472 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
michael
parent
743e03099f
commit
1afb6bc118
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@ -1,4 +1,4 @@
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NUT Open Container Format DRAFT 20040911
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NUT Open Container Format DRAFT 20050111
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----------------------------------------
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@ -89,10 +89,9 @@ main header:
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version v
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stream_count v
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max_distance v
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max_short_distance v
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max_index_distance v
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global_time_base_nom v
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global_time_base_denom v
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short_startcode v
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for(i=0; i<256; ){
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tmp_flag v
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tmp_fields v
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@ -133,11 +132,7 @@ stream_header:
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decode_delay v
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fixed_fps 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 vb
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}
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codec_specific_data vb
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video_stream_header:
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stream_header
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@ -176,6 +171,7 @@ frame
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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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@ -184,7 +180,7 @@ Index:
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reserved_bytes
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checksum u(32)
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info_packet: (optional) (file global)
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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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@ -203,27 +199,6 @@ info_packet: (optional) (file global)
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}
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reserved_bytes
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checksum u(32)
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meta_packet: (optional) (stream specific)
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meta_startcode f(64)
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packet header
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stream_id v
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for(;;){
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id v
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if(id==0) break
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name= meta_table[id][0]
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type= meta_table[id][1]
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if(type==NULL)
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type vb
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if(name==NULL)
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name vb
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if(type=="v")
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value v
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else
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value vb
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}
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reserved_bytes
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checksum u(32)
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sync_point
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frame_startcode f(64)
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@ -243,9 +218,7 @@ file
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if(next_code == info_startcode)
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info_packet
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else{
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if(next_code == short_startcode)
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short_startcode u(24)
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else if(next_code == frame_startcode)
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if(next_code == frame_startcode)
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sync_point
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frame
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}
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@ -277,8 +250,6 @@ index_startcode
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0xDD672F23E64EULL + (((uint64_t)('N'<<8) + 'X')<<48)
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info_startcode
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0xAB68B596BA78ULL + (((uint64_t)('N'<<8) + 'I')<<48)
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meta_startcode
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FIXME
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version
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2 for now
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@ -292,31 +263,24 @@ max_distance
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reason to set it higher otherwise reasonable error recovery will be
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impossible
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max_short_distance
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max distance of short startcodes or frame_startcodes, the distance may
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only be larger if there is only a single frame between the 2
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frame_startcodes/short startcodes this can be used by the demuxer to
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detect damaged frame headers if the damage results in a too long chain
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SHOULD be set to <=4096 or at least <=8192 unless there is a very good
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reason to set it higher otherwise reasonable error recovery will be
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impossible
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max_index_distance
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max distance of keyframes which are represented in the index, the
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distance between consecutive entries A and B may only be larger if
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there are no keyframes within this stream between A and B
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SHOULD be set to <=32768 or at least <=65536 unless there is a very good
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reason to set it higher
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short_startcode
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MUST be 3 bytes long and MUST have 'N' as first byte, the second byte
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MUST not be a printable uppercase letter / must not be within 65..90,
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default is 0x4EFE79
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stream_id
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stream_id[FIXME]
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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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so a stream with class 0 MUST always have a id which is lower then any
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stream with class > 0
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stream_id MUST be < stream_count
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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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1 audio
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2 subtiles
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3 metadata
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Note the remaining values are reserved and MUST NOT be used
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a demuxer MUST ignore streams with reserved classes
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@ -325,13 +289,6 @@ fourcc
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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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@ -382,16 +339,6 @@ decode_delay
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fixed_fps
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1 indicates that the fps is fixed
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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 independent 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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@ -487,11 +434,15 @@ checksum
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adler32 checksum
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index_timestamp
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value of the timetamp in a sync point relative to the last sync-point
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value of the timetamp of a keyframe relative to the last keyframe
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stored in this index
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index_position
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position in bytes of the first byte of a sync-point, relative to the
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last sync_point
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position in bytes of the first byte of a keyframe, relative to the
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last keyframe stored in this index
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there MUST be no keyframe with the same stream_id as this index between
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2 consecutive index entries if they are more then max_index_distance
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appart
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id
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the id of the type/name pair, so its more compact
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@ -504,6 +455,7 @@ type
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info packet types
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the name of the info entry, valid names are
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"StreamId" the stream(s) to which the info packet applies
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"Author"
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"Description"
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@ -520,10 +472,11 @@ info packet types
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Note: dont forget the timezone
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"Keywords"
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"TotalTime" total length of the stream in msecs
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meta packet types
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"ReplayGain"
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"Language" the language code
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"Language" ISO 639 and ISO 3166 for language/country code
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something like "eng" (US english), can be 0 if unknown
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and "multi" if several languages
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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.htmlthe language code
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"Disposition" "original", "dub" (translated), "comment", "lyrics", "karaoke"
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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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@ -543,25 +496,17 @@ info_table[][2]={
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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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{"Author" , "UTF8"},
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{"Titel" , "UTF8"},
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{"Language" , "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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meta_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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{"Language" , to be decided},
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{"Disposition" , to be decided},
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{"ReplayGain" , to be decided},
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{"Disposition" , "UTF8"},
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};
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Structure:
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@ -596,7 +541,7 @@ 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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each time but only if also 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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