mirror of https://github.com/mpv-player/mpv
cosmetic reformatting: tabs --> spaces, prettyprinting, trailing whitespace
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@16687 b3059339-0415-0410-9bf9-f77b7e298cf2
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diego
parent
4fe19377b1
commit
f9ba1d8575
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@ -11,15 +11,18 @@ Features / goals:
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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 of 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 100 bytes (audio + video headers together)
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a packet header is about ~1-8 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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@ -108,8 +111,8 @@ reserved_bytes:
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reserved u(8)
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[a demuxer MUST ignore any reserved bytes
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a muxer MUST NOT write any reserved bytes, as this would make it
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impossible to add new fields at the end of packets in the future in
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a compatible way]
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impossible to add new fields at the end of packets in the future
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in a compatible way]
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Headers:
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@ -309,6 +312,7 @@ frame_startcode
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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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@ -375,11 +379,11 @@ global_timestamp
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when a global_timestamp is encountered the last_pts of all
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streams is set to the following:
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ln= global_time_base_nom*time_base_denom
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sn= global_timestamp
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d1= global_time_base_denom
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d2= time_base_nom
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last_pts= (ln/d1*sn + ln%d1*sn/d1)/d2
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ln = global_time_base_nom*time_base_denom
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sn = global_timestamp
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d1 = global_time_base_denom
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d2 = time_base_nom
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last_pts = (ln/d1*sn + ln%d1*sn/d1)/d2
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Note: this calculation MUST be done with unsigned 64 bit integers, and
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is equivalent to (ln*sn)/(d1*d2) but this would require a 96bit integer
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@ -408,8 +412,8 @@ flags[frame_code]
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first of the flags from MSB to LSB are called KD
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if D is 1 then data_size_msb is coded, otherwise data_size_msb is 0
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K is the keyframe_type
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0-> no keyframe,
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1-> keyframe,
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0 -> no keyframe,
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1 -> keyframe,
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flags=4 can be used to mark illegal frame_code bytes
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frame_code=78 must have flags=4
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Note: frames MUST NOT depend(1) upon frames prior to the last
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@ -438,8 +442,8 @@ coded_pts
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pts, otherwise it is a full pts + (1<<msb_pts_shift)
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lsb pts is converted to a full pts by:
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mask = (1<<msb_pts_shift)-1;
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delta= last_pts - mask/2
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pts= ((pts_lsb-delta)&mask) + delta
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delta = last_pts - mask/2
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pts = ((pts_lsb-delta)&mask) + delta
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lsb_pts
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least significant bits of the pts in time_base precision
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@ -450,7 +454,7 @@ lsb_pts
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frame lsb_pts=2 -> pts=2
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...
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keyframe msb_pts=257 -> pts=257
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frame lsb_pts=255->pts=255
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frame lsb_pts=255 -> pts=255
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frame lsb_pts=0 -> pts=256
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frame lsb_pts=4 -> pts=260
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frame lsb_pts=2 -> pts=258
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@ -520,31 +524,39 @@ 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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"StreamId"
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the stream(s) to which the info packet applies
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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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"Encoder"
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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 (preferably 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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"Cover"
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image of the (CD, DVD, VHS, ..) cover (preferably PNG or JPEG)
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"Source"
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"DVD", "VCD", "CD", "MD", "FM radio", "VHS", "TV", "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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"CaptureDevice"
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"BT878", "BT848", "webcam", ... (more exact names are fine too)
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"CreationTime"
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"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: do not forget the timezone
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"Keywords"
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"TotalTime" total length of the stream in msecs
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"Language" ISO 639 and ISO 3166 for language/country code
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"TotalTime"
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total length of the stream in msecs
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"Language"
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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.html the 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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and http://www.din.de/gremien/nas/nabd/iso3166ma/codlstp1/en_listp1.html
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the language code
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"Disposition"
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"original", "dub" (translated), "comment", "lyrics", "karaoke"
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Note: if someone needs some others, please tell us about them, so we
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can 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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