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| == Introduction ==
| | #REDIRECT [[OggWrit]] |
| Ogg Writ is a text phrase codec. While its primary purpose is to embed
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| subtitles or captions in a Theora stream, its design makes it useful
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| for many other purposes. It could provide lyrics to song encoded in
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| Vorbis, a transcript to a political debate encoded in Speex, or even
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| incorporate a live chat session as part of a continuous video stream.
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| | |
| One of the unique aspects of Writ is its discontinuous nature, that is,
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| unlike other Ogg codecs the granules for which seperate packets effect
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| may overlap. See the Granules and Muxing section
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| below for how this works.
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| | |
| | |
| === SVN ===
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| Current Ogg Writ development is on Xiph SVN as /trunk/writ/. It's
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| being developed to use libogg2, so you'll need both to work on it.
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| The reference encoder and decoder are available as part of the py-ogg2
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| package which is available on Xiph SVN as /trunk/py-ogg2/.
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| | |
| | |
| <B>This is a (near final) working draft of the spec</B><BR>
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| Writ has been designed so that encoders/decoders can support a bare
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| minimum and be fully compatable with future subversions. Each subversion
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| adds a new feature, some building on others, adding a new header packet
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| and likely a new field to each body packet.
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| <P>
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| Decoders should ignore header packets beyond what they were written to
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| support and also ignore extra fields in data packets beyond their
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| current version. This allows new features to be added without requiring
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| that all software, or even most software, to support them.
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| <P>
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| We will be conservative about adding future subversions.
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| | |
| <pre>
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| Header Packet 0 (BOS, 16 bytes):
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| 0x00 ( 8 bit Header 0)
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| "writ" (LSB 0x74697277) (32 bit codec identification)
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| version ( 8 bit unsigned int, 0 = Alpha)
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| subversion ( 8 bit unsigned int)
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| granulerate_numerator (32 bit unsigned int)
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| granulerate_denominator (32 bit unsigned int)
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| | |
| Data Packet (each):
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| 0xFF ( 8 bit 0xFF = data packet)
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| granule_start (64 bit signed integer)
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| granule_duration (32 bit unsigned integer)
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| text_length ( 8 bit unsigned integer)
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| text_string (variable-length UTF-8 string)
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| | |
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| <B>Subversion 1 adds multiple language support</B>
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| | |
| Header Packet 1 (Language Definition, 8+ bytes) :
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| 0x01 ( 8 bit Header 1)
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| "writ" (LSB 0x74697277) (32 bit codec identification)
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| num_languages ( 8 bit unsigned int)
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| [repeated 1+num_languages times] :
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| language_length ( 8 bit unsigned int)
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| language_string (0+language_length rfc3066)
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| language_desc_length ( 8 bit unsigned int)
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| language_desc_string (0+language_desc_length UTF-8)
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| | |
| Data Packet (each):
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| 0xFF ( 8 bit 0xFF = data packet)
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| granule_start (64 bit signed integer)
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| granule_duration (32 bit unsigned integer)
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| [repeated num_languages times] :
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| text_length ( 8 bit unsigned integer)
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| text_string (variable-length UTF-8 string)
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| | |
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| <B>Subversion 2 adds text window support</B>
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| | |
| Header Packet 2 (Window Definition, 10+ bytes) :
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| 0x02 ( 8 bit Header 2)
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| "writ" (LSB 0x74697277) (32 bit codec identification)
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| location_scale_x (16 bit unsigned int)
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| location_scale_y (16 bit unsigned int)
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| num_windows ( 8 bit unsigned int)
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| [if (window_num > 0) repeated window_num times] :
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| location_x (variable length, see below)
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| location_y (variable length, see below)
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| location_width (variable length, see below)
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| location_height (variable length, see below)
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| alignment_x ( 2 bit alignment, see below)
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| alignment_y ( 2 bit alignment, see below)
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| | |
| Data Packet (each):
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| 0xFF ( 8 bit 0xFF = data packet)
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| granule_start (64 bit signed integer)
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| granule_duration (32 bit unsigned integer)
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| [repeated num_languages times] :
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| text_length ( 8 bit unsigned integer)
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| text_string (variable-length UTF-8 string)
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| [if (window_num > 1)] :
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| window_id ( 8 bit unsigned integer)
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| | |
| | |
| <B>Example Stream</B>
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| Header Packet 0
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| version 0
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| subversion 2
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| granulenum 1
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| granuledom 1
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| \x00writ\x00\x02\x01\x00\x00\x00\x01\x00\x00\x00
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| | |
| Header Packet 1
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| num_languages 2
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| Language 0:
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| language en
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| language_desc English
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| Language 1:
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| language es
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| language_desc Spanish
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| \x01writ\x01\x02en\x07English\x02es\x07Spanish
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| | |
| Header Packet 2
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| location_scale_x 4000 (12 bits)
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| location_scale_y 270 ( 9 bits)
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| num_windows 2
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| Window 0:
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| location_x 1
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| location_y 2
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| location_width 3
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| location_height 1
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| alignment_x 3 (Full)
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| alignment_y 3 (Full)
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| Window 1:
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| location_x 5
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| location_y 6
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| location_width 7
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| location_height 1
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| alignment_x 3 (Full)
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| alignment_y 3 (Full)
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| \x02writ\xa0\x0f\x0e\x01\x02\x01\x20\x60\x00\x02\x7c\x01\x18\x38\x80\x00\x0f
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| | |
| Phrase Packet:
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| granule_start 5
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| granule_duration 10
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| Language 0: "Hello World!"
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| Language 1: "Hola, Mundo!"
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| window_id 0
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| \xff\x05\x00\x00\x00\x00\x00\x00\x00\x0a\x00\x00\x00\x0cHello World!\x0cHola, Mundo!\x00
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| | |
| Phrase Packet:
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| granule_start 12
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| granule_duration 15
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| Language 0: "It's a beautiful day to be born."
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| Language 1: "Es un día hermoso para que se llevará."
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| window_id 1
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| \xff\x0c\x00\x00\x00\x00\x00\x00\x00\x0f\x00\x00\x00\x20It's a beautiful day to be born.\x26Es un d\xeda hermoso para que se llevar\xe1.\x01
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| | |
| | |
| </pre>
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| | |
| == Granules and Muxing ==
| |
| | |
| Granulepos in Writ (as well as future discontinuous codecs) will be by
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| start time, not end time, that the data in a given page is tagged for.
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| This greatly simplifies this specification (see the old method below).
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| | |
| All Writ phrases will be provided at and given the granulepos of their
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| start time, ordered by their start time within the logical bitstream.
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| | |
| Phrase packets with long durations should be repeated in the logical
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| bitstream at regular intervals to ensure that a player seeking to the
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| middle of their duration will still see them. These packet copies will
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| be identical to their original, including the start and duration fields,
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| the granulepos of the page they reside on will be incremented for each
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| copy to place it forward on the logical bitstream.
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| | |
| No two phrases can start on the same granule. On decoding, each packets'
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| start granule is checked against already known packets. If a match is
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| found the new packet is ignored. This prevents phrase copies from being
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| interpreted as new phrases.
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| | |
| == Seeking Example ==
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| <pre>
| |
| | |
| Here is a timeline (granule numbers at top, read down) of a sample stream:
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| | |
| <- Granules ->
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| 0000000000111111111122222222223333333333444444444455555555556666666666
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| 0123456789012345678901234567890123456789012345678901234567890123456789
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| ___________ ____________ ____________ ____________ _____________
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| |_Vorbis____||_Vorbis_____||_Vorbis_____||_Vorbis_____||_Vorbis______|
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| ____________________ ____________________________________
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| |_A____________>_____| |_D____________>______________>______|
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| _________ ___ __________ ___________
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| |_B_______| |_C_| |_E________| |_F_________|
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| | |
| (note: these have been seperated vertically for easy viewing only)
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| | |
| Packet Granule Description
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| V H0 0 Vorbis Header 0x01 (page by itself)
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| W H0 0 Writ Header 0 (page by itself)
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| V H1 0 Vorbis Header 0x03
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| V H2 0 Vorbis Header 0x05
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| W H1 0 Writ Header 1 (Language Defs)
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| W H2 0 Writ Header 2 (Window Defs)
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| W A 0 Writ Phrase A
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| W B 4 Writ Phrase B
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| V 12 Vorbis 0-12
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| W A 15 Writ Phrase A
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| W C 19 Writ Phrase C
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| W D 23 Writ Phrase D
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| V 26 Vorbis 13-26
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| W E 26 Writ Phrase E
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| W D 38 Writ Phrase D
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| V 40 Vorbis 27-40
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| W F 41 Writ Phrase F
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| W D 53 Writ Phrase D (EOF)
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| V 54 Vorbis 41-54
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| V 69 Vorbis 55-69 (EOF)
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| | |
| </pre>
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| | |
| Player begins decoding at beginning of stream. It reads the BOS pages
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| for both codecs, then receives a non-BOS page. At this point it knows
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| that it has two bitstreams to decode and has resolved that one is Writ
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| and the other Vorbis. It'll continue processing the headers for both.
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| | |
| Next it's going to find two Writ packets (phrases A and B) and toss them
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| into libwrit. Then it'll get to the first Vorbis data page. It now has
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| data from both bitstreams, and it knows (from the granulepos on the
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| Vorbis page) that it has enough data to run until 12. If there were any
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| Writ packets before 12 they would have appeared first.
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| | |
| At around granule 9 the listener seeks forward to 24. This will cause a
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| rapid seek through the file to find the first page with a granulepos
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| greater than the seek position and begin decoding at that point.
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| | |
| It'll find a Vorbis packet containing 13-26 (and not use 13-23) and Writ
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| phrase E. Again, having data from both bitstreams it can begin playing.
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| D would normally appear at granule 24 but is not known about yet. The
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| player knows that this is only enough to decode until 26 so, knowing
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| enough to prebuffer, continues reading the file as it plays the media.
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| | |
| The next packet it finds is Writ phrase D, and passing it to libwrit, is
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| found that the current granulepos is within the duration. It is thus
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| displayed immediatly, as it's prebuffered, without waiting for
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| granulepos 38. It'll keep reading (because the maximum decoded Vorbis
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| is still 26) and find a Vorbis packet with a 40 granulepos.
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| | |
| As it nears 38 it'll read the file again and find Writ phrase F, which
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| takes it out to 41. Vorbis only goes until 40, so it'll have to keep
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| reading until the next Vorbis packet.
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| | |
| Next it'll find Writ phrase D, which will be ignored by libwrit because
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| phrase D is already known (matches start granule of earlier D), and the
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| EOF on that page marks this as the last of the Writ stream.
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| | |
| It'll continue reading for the next Vorbis data and find the packet
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| for granule 54, followed by the Vorbis packet for granule 69. With that
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| it's EOS, EOF, finished.
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| | |
| This is of course a simplistic example, Writ and Vorbis will rarely have
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| granules which equal the same amount of time. Each bitstream has its'
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| own granule -> time mapping which is calculated when muxing concurrent
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| bitstreams within the file. So if there are 44100 Vorbis granules
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| per second and only 4 Writ granules per second, pages would be ordered
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| as W25 V297892 W31 V385932 W39 W41 V463057 etc. The logic used in the
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| above example works after this granule-time mapping is calculated.
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| | |
| | |
| == Ongoing Discussion ==
| |
| | |
| * How does this get "encoded" and "merged"?
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| ** <purple_haese> The muxing rule is pages are arranged in ascending order by the timestamp that is represented by their granulepos.
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| | |
| * For what reason is the 0x00 and 0xFF byte at the beginning of header and data packet respectively?
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| ** <xiphmont> If, after a seek, I hand your codec a header packet, what does the codec do?
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| ** <xiphmont> It does *nothing*. If I haven't told it to reset, the header is not data, *it must ignore the header*.
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| ** <xiphmont> this eliminates a huge raft of special cases in Ogg seeking.
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| | |
| | |
| | |
| == "The Old Way" ==
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| <B>The section below is for historical purposes only!</B>
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| <pre>
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| - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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| 2003/08/17
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| In a lengthy discussion with Monty and Derf the decidion to change the
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| behavior of discontinuous bitstreams in Ogg, or rather, extend the
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| current Ogg specification to handle discontinuous codecs, was made.
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| - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
| |
| </pre>
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| | |
| The Ogg granulepos of each page is equal to the expiration of the text,
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| packets are ordered by expiration time and may overlap. So, at or before
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| text A is to be displayed, the following sequence is included:
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| | |
| <pre>
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| Physical Text Text Text
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| Location Packet Start Expire (text expire = page granulepos)
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| ---------------------------------------
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| 00 B 04 14
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| 00 D 19 23
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| 00 C 09 24
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| 00 F 27 34
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| 00 E 26 37
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| 00 G 35 47
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| 00 H 42 54
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| 00 A 00 59
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| 51 I 51 66
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| </pre>
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| So B, D, C, F, E, G, and H are all defined before A, building a FIFO (first
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| in first out) buffer in the player. Encoders should limit the extend of this
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| behavior to reduce nessesary buffer size on the player side by prematurly
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| expiring captions and recreating them periodically.
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| | |
| The screen should not be updated with the new captions until they've all
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| been processed to prevent "flicker". New caption data to the same position
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| will scroll the previous data upwards with no line breaks seperating them
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