OggMIDI - Revision history

Saoshyant: cat

2008-11-05T21:03:37Z

cat

← Older revision		Revision as of 21:03, 5 November 2008
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	The granulepos field used for the Ogg page timestamps records microseconds since the beginning of the stream.		The granulepos field used for the Ogg page timestamps records microseconds since the beginning of the stream.
		+
		+	[[Category:Ogg Mappings]]

Rillian: Document granulepos based on the oggmerge code

2008-11-05T19:47:42Z

Document granulepos based on the oggmerge code

← Older revision		Revision as of 19:47, 5 November 2008
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	This mapping was designed by Jack Moffitt. See [http://lists.xiph.org/pipermail/vorbis-dev/2001-August/004501.html this mailing list post] for documentation of his scheme.		This mapping was designed by Jack Moffitt. See [http://lists.xiph.org/pipermail/vorbis-dev/2001-August/004501.html this mailing list post] for documentation of his scheme.

-	= Header packet	+	== Header packet ==

	OggMIDI streams have a single header packet for codec identification.		OggMIDI streams have a single header packet for codec identification.
Line 31:		Line 31:
	The timebase occupies the final 16 bits and gives the number of ticks per time format unit.		The timebase occupies the final 16 bits and gives the number of ticks per time format unit.

-	= Data packets	+	== Data packets ==

	The header packet is followed by a series of data packets, each of which contains an integral number of midi events.		The header packet is followed by a series of data packets, each of which contains an integral number of midi events.
		+
		+	== Granulepos ==
		+
		+	The granulepos field used for the Ogg page timestamps records microseconds since the beginning of the stream.

Rillian: roughly document the encapsulation structure

2008-11-05T19:37:30Z

roughly document the encapsulation structure

← Older revision		Revision as of 19:37, 5 November 2008
Line 2:		Line 2:

	This mapping was designed by Jack Moffitt. See [http://lists.xiph.org/pipermail/vorbis-dev/2001-August/004501.html this mailing list post] for documentation of his scheme.		This mapping was designed by Jack Moffitt. See [http://lists.xiph.org/pipermail/vorbis-dev/2001-August/004501.html this mailing list post] for documentation of his scheme.
		+
		+	= Header packet
		+
		+	OggMIDI streams have a single header packet for codec identification.
		+
		+	0 1 2 3
		+	0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1\| Byte
		+	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
		+	\| Identifier 'OggMIDI\0' \| 0-3
		+	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
		+	\| \| 4-7
		+	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
		+	\| version number \| time format \| 8-11
		+	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
		+	\| timebase \| 12-13
		+	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
		+
		+	The header packet begins with the character sequence 'OggMIDI\0' for codec identification.
		+
		+	This is followed by an 8 bit version field. The version must be 0 for the mapping described here.
		+
		+	The time format field is also 8 bits, and describes the timestamp format used by the midi data. It is interpreted as follows:
		+
		+	* 1 one beat per quarter note
		+	* 24, 25, 29, 30, (50, 59, 60?) corresponding smpte frame
		+	* other values are undefined
		+
		+	The timebase occupies the final 16 bits and gives the number of ticks per time format unit.
		+
		+	= Data packets
		+
		+	The header packet is followed by a series of data packets, each of which contains an integral number of midi events.

Rillian: Record the Ogg<->MIDI mapping

2008-11-05T19:15:47Z

Record the Ogg<->MIDI mapping

New page

Mapping for embedding MIDI data streams in Ogg.

This mapping was designed by Jack Moffitt. See [http://lists.xiph.org/pipermail/vorbis-dev/2001-August/004501.html this mailing list post] for documentation of his scheme.