LMLM4: Difference between revisions
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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). | ||
Revision as of 09:53, 4 January 2008
- Extension: LML uses .divx on their website, though there are other file formats that use that, too.
- Company: Linux Media Labs
- Website: http://www.linuxmedialabs.com/
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).
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.
channel_number, frame_type and packet_size are stored in big-endian order.
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.