/usr/include/bitstream/ietf/rfc4175.h is in libbitstream-dev 1.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* rfc4175.h: RFC Profile for uncompressed video
*****************************************************************************
* Copyright (C) 2016 Open Broadcast Systems Ltd.
*
* Authors: Rostislav Pehlivanov <rpehlivanov@obe.tv>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject
* to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*****************************************************************************/
/*
* Normative references:
* - IETF RFC 4175 Uncompressed
*/
#ifndef __BITSTREAM_IETF_RFC4175_H__
#define __BITSTREAM_IETF_RFC4175_H__
#include <stdint.h> /* uint8_t, uint16_t, etc... */
#ifdef __cplusplus
extern "C"
{
#endif
#define RFC_4175_EXT_SEQ_NUM_LEN 2
#define RFC_4175_HEADER_LEN 6 /* Note: extended sequence number not included */
/* 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
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Extended Sequence Number | Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |F| Line No |C| Offset |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Length |F| Line No |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* |C| Offset | .
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ .
* . .
* . Two (partial) lines of video data .
* . .
* +---------------------------------------------------------------+
*/
static inline void rfc4175_set_extended_sequence_number(uint8_t *buf, uint16_t number)
{
buf[0] = (number >> 8) & 0xff;
buf[1] = number & 0xff;
}
static inline uint16_t rfc4175_get_extended_sequence_number(const uint8_t *buf)
{
return (buf[0] << 8) | buf[1];
}
static inline void rfc4175_set_line_length(uint8_t *buf, uint16_t length)
{
buf[0] = (length >> 8) & 0xff;
buf[1] = length & 0xff;
}
static inline uint16_t rfc4175_get_line_length(const uint8_t *buf)
{
return (buf[0] << 8) | buf[1];
}
static inline void rfc4175_set_line_field_id(uint8_t *buf, uint8_t id)
{
buf[2] |= (!!id) << 7;
}
static inline uint8_t rfc4175_get_line_field_id(const uint8_t *buf)
{
return buf[2] >> 7;
}
static inline void rfc4175_set_line_number(uint8_t *buf, uint16_t number)
{
buf[2] |= (number >> 8) & 0x7f;
buf[3] = number & 0xff;
}
static inline uint16_t rfc4175_get_line_number(const uint8_t *buf)
{
return ((buf[2] & 0x7f) << 8) | buf[3];
}
static inline void rfc4175_set_line_continuation(uint8_t *buf, uint8_t continuation)
{
buf[4] |= (!!continuation) << 7;
}
static inline uint8_t rfc4175_get_line_continuation(const uint8_t *buf)
{
return buf[4] >> 7;
}
static inline void rfc4175_set_line_offset(uint8_t *buf, uint16_t offset)
{
buf[4] |= (offset >> 8) & 0x7f;
buf[5] = offset & 0xff;
}
static inline uint16_t rfc4175_get_line_offset(const uint8_t *buf)
{
return ((buf[4] & 0x7f) << 8) | buf[5];
}
#ifdef __cplusplus
}
#endif
#endif
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