LMLM4 - Revision history

Multimedia Mike: samples link

2008-01-05T19:59:53Z

samples link

← Older revision		Revision as of 12:59, 5 January 2008
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	* Company: Linux Media Labs		* Company: Linux Media Labs
	* Website: http://www.linuxmedialabs.com/		* Website: http://www.linuxmedialabs.com/
			* Samples: http://www.linuxmedialabs.com/LML_downloads.php?dl=SA

	LMLM4 files are near-raw files, containing [[MPEG-4]] video and [[MPEG-1 Layer II]], [[μ-law]] or [[ADPCM]] audio.		LMLM4 files are near-raw files, containing [[MPEG-4]] video and [[MPEG-1 Layer II]], [[μ-law]] or [[ADPCM]] audio.

2008-01-04T21:38:03Z

clarify

← Older revision		Revision as of 14:38, 4 January 2008
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	LMLM4 files are near-raw files, containing [[MPEG-4]] video and [[MPEG-1 Layer II]], [[μ-law]] or [[ADPCM]] audio.		LMLM4 files are near-raw files, containing [[MPEG-4]] video and [[MPEG-1 Layer II]], [[μ-law]] or [[ADPCM]] audio.

	A file contains multiple packets, padded with zeroes to a multiple of 512 (one block).		A file contains multiple packets. Each packet is padded with zeroes to a multiple of 512 bytes (one block).

	typedef struct {		typedef struct {

2008-01-04T20:22:41Z

faster method of calculating the number of padding bytes

2008-01-04T18:02:25Z

typo

← Older revision		Revision as of 11:02, 4 January 2008
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	* Website: http://www.linuxmedialabs.com/		* Website: http://www.linuxmedialabs.com/

	LMLM4 files are near-raw files, containing [[MPEG-4]] video and [[MPEG-1 Layer II]], [[μ-law]] or [[ADPCM]] ~~adio~~.		LMLM4 files are near-raw files, containing [[MPEG-4]] video and [[MPEG-1 Layer II]], [[μ-law]] or [[ADPCM]] audio.

	A file contains multiple packets, padded with zeroes to a multiple of 512 (one block).		A file contains multiple packets, padded with zeroes to a multiple of 512 (one block).

2008-01-04T17:09:42Z

wikilinks

← Older revision		Revision as of 10:09, 4 January 2008
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	* Website: http://www.linuxmedialabs.com/		* Website: http://www.linuxmedialabs.com/

	LMLM4 files are near-raw files, containing MPEG-4 video and MPEG-1 Layer 2, μ-law or ADPCM adio.		LMLM4 files are near-raw files, containing [[MPEG-4]] video and [[MPEG-1 Layer II]], [[μ-law]] or [[ADPCM]] adio.

	A file contains multiple packets, padded with zeroes to a multiple of 512 (one block).		A file contains multiple packets, padded with zeroes to a multiple of 512 (one block).

2008-01-04T17:02:07Z

spelling of μ-law

← Older revision		Revision as of 10:02, 4 January 2008
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	* Website: http://www.linuxmedialabs.com/		* Website: http://www.linuxmedialabs.com/

	LMLM4 files are near-raw files, containing MPEG-4 video and MPEG-1 Layer 2, ~~uLaw~~ or ADPCM adio.		LMLM4 files are near-raw files, containing MPEG-4 video and MPEG-1 Layer 2, μ-law or ADPCM adio.

	A file contains multiple packets, padded with zeroes to a multiple of 512 (one block).		A file contains multiple packets, padded with zeroes to a multiple of 512 (one block).
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	0x02 - B-Frame, video		0x02 - B-Frame, video
	0x04 - MPEG-1 Layer 2 audio		0x04 - MPEG-1 Layer 2 audio
	0x05 - ~~uLaw~~, audio		0x05 - μ-law, audio
	0x06 - ADPCM, audio		0x06 - ADPCM, audio

2008-01-04T16:53:22Z

mpeg-1 layer 2

← Older revision		Revision as of 09:53, 4 January 2008
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	* Website: http://www.linuxmedialabs.com/		* Website: http://www.linuxmedialabs.com/

	LMLM4 files are near-raw files, containing MPEG-4 video and MPEG Layer 2, uLaw or ADPCM adio.		LMLM4 files are near-raw files, containing MPEG-4 video and MPEG-1 Layer 2, uLaw or ADPCM adio.

	A file contains multiple packets, padded with zeroes to a multiple of 512 (one block).		A file contains multiple packets, padded with zeroes to a multiple of 512 (one block).

2008-01-04T16:52:38Z

cosmetics

← Older revision		Revision as of 09:52, 4 January 2008
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	LMLM4 files are near-raw files, containing MPEG-4 video and MPEG Layer 2, uLaw or ADPCM adio.		LMLM4 files are near-raw files, containing MPEG-4 video and MPEG Layer 2, uLaw or ADPCM adio.

	A file contains multiple packets, padded with zeroes to a multiple of 512 (~~the~~ block ~~size~~).		A file contains multiple packets, padded with zeroes to a multiple of 512 (one block).

	typedef struct {		typedef struct {
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	The maximum size of a packet is 1048576 bytes, which is 2048 blocks.		The maximum size of a packet is 1048576 bytes, which is 2048 blocks.
	channel_number, frame_type and packet_size are stored in big-endian order.
			'''channel_number''', '''frame_type''' and '''packet_size''' are stored in big-endian order.

	The following frametypes are supported:		The following frametypes are supported:

2008-01-04T16:51:23Z

note on endianness of fields

← Older revision		Revision as of 09:51, 4 January 2008
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	The maximum size of a packet is 1048576 bytes, which is 2048 blocks.		The maximum size of a packet is 1048576 bytes, which is 2048 blocks.
			channel_number, frame_type and packet_size are stored in big-endian order.

	The following frametypes are supported:		The following frametypes are supported:

2008-01-04T16:49:19Z

details of format

← Older revision		Revision as of 09:49, 4 January 2008
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	LMLM4 files are near-raw files, containing MPEG-4 video and MPEG Layer 2, uLaw or ADPCM adio.		LMLM4 files are near-raw files, containing MPEG-4 video and MPEG Layer 2, uLaw or ADPCM adio.

			A file contains multiple packets, padded with zeroes to a multiple of 512 (the block size).

			typedef struct {
			uint16_t channel_number;
			uint16_t frame_type;
			uint32_t packet_size;
			uint8_t data[packet_size - 8];
			uint8_t padding[ (512 - packet_size % 512) & 511 ];
			} LMLM4_Packet;

			The maximum size of a packet is 1048576 bytes, which is 2048 blocks.

			The following frametypes are supported:

			0x00 - I-Frame, video
			0x01 - P-Frame, video
			0x02 - B-Frame, video
			0x04 - MPEG-1 Layer 2 audio
			0x05 - uLaw, audio
			0x06 - ADPCM, audio

			One packet contains a complete decodable frame.

	[[Category:Container Formats]]		[[Category:Container Formats]]