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105 lines
3.0 KiB
105 lines
3.0 KiB
#ifndef __OGMSTREAMS_H
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#define __OGMSTREAMS_H
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/*
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* Taken from http://tobias.everwicked.com/packfmt.htm
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*
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* Changes: Prefixed types with ogm_ to avoid namespace polution
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* -- tibit
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*
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First packet (header)
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---------------------
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pos | content | description
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-------+-------------------------+----------------------------------
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0x0000 | 0x01 | indicates 'header packet'
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-------+-------------------------+----------------------------------
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0x0001 | ogm_stream_header | the size is indicated in the
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| | size member
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Second packet (comment)
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-----------------------
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pos | content | description
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-------+-------------------------+----------------------------------
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0x0000 | 0x03 | indicates 'comment packet'
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-------+-------------------------+----------------------------------
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0x0001 | data | see vorbis doc on www.xiph.org
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Data packets
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------------
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pos | content | description
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---------+-------------------------+----------------------------------
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0x0000 | Bit0 0 | indicates data packet
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| Bit1 Bit 2 of lenbytes |
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| Bit2 unused |
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| Bit3 keyframe |
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| Bit4 unused |
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| Bit5 unused |
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| Bit6 Bit 0 of lenbytes |
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| Bit7 Bit 1 of lenbytes |
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---------+-------------------------+----------------------------------
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0x0001 | LowByte | Length of this packet in samples
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| ... | (frames for video, samples for
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| HighByte | audio, 1ms units for text)
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---------+-------------------------+----------------------------------
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0x0001+ | data | packet contents
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lenbytes | |
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*
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*
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*/
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//// oggDS headers
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// Header for the new header format
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typedef struct ogm_stream_header_video
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{
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ogg_int32_t width;
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ogg_int32_t height;
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} ogm_stream_header_video;
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typedef struct ogm_stream_header_audio
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{
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ogg_int16_t channels;
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ogg_int16_t blockalign;
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ogg_int32_t avgbytespersec;
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} ogm_stream_header_audio;
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typedef struct ogm_stream_header
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{
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char streamtype[8];
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char subtype[4];
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ogg_int32_t size; // size of the structure
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ogg_int64_t time_unit; // in reference time
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ogg_int64_t samples_per_unit;
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ogg_int32_t default_len; // in media time
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ogg_int32_t buffersize;
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ogg_int16_t bits_per_sample;
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ogg_int16_t padding;
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union
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{
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// Video specific
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ogm_stream_header_video video;
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// Audio specific
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ogm_stream_header_audio audio;
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} sh;
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} ogm_stream_header;
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/// Some defines from OggDS
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#define OGM_PACKET_TYPE_HEADER 0x01
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#define OGM_PACKET_TYPE_COMMENT 0x03
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#define OGM_PACKET_TYPE_BITS 0x07
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#define OGM_PACKET_LEN_BITS01 0xc0
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#define OGM_PACKET_LEN_BITS2 0x02
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#define OGM_PACKET_IS_SYNCPOINT 0x08
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#endif /* __OGMSTREAMS_H */
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