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Merge branch 'jdek/bitstream-master'

master
Christophe Massiot 5 years ago
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      ietf/rtp2435.h

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ietf/rtp2435.h View File

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/*****************************************************************************
* rtp2435.h: RFC Profile for JPEG
*****************************************************************************
* Copyright (C) 2019 Josh de Kock
*
* Authors: Josh de Kock <josh@itanimul.li>
*
* 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.
*****************************************************************************/
/*
* RTP Payload Format for JPEG
*/
#ifndef __BITSTREAM_IETF_RTP2435_H__
#define __BITSTREAM_IETF_RTP2435_H__
#ifdef __cplusplus
extern "C"
{
#endif
#define RTP_2435_HEADER_SIZE 8
#define RTP_2435_RESTART_HEADER_SIZE 4
#define RTP_2435_QUANTIZATION_HEADER_SIZE 4
/*
* Reminder : JPEG header which immediately follows the RTP header
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type-specific | Fragment Offset |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Type | Q | Width | Height |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
static inline void rtp2435_set_ts(uint8_t *header, uint8_t ts)
{
header[0] = ts;
}
static inline uint8_t rtp2435_get_ts(uint8_t *header)
{
return header[0];
}
static inline void rtp2435_set_offset(uint8_t *header, uint32_t offset)
{
header[1] = (offset & 0xFF0000) >> 16;
header[2] = (offset & 0xFF00) >> 8;
header[3] = offset & 0xFF;
}
static inline uint32_t rtp2435_get_offset(uint8_t *header)
{
return header[1] << 16 | header[2] << 8 | header[3];
}
static inline void rtp2435_set_type(uint8_t *header, uint8_t type)
{
header[4] = type;
}
static inline uint8_t rtp2435_get_type(uint8_t *header)
{
return header[4];
}
static inline void rtp2435_set_q(uint8_t *header, uint8_t q)
{
header[5] = q;
}
static inline uint8_t rtp2435_get_q(uint8_t *header)
{
return header[5];
}
static inline void rtp2435_set_width(uint8_t *header, uint8_t width)
{
header[6] = width;
}
static inline uint8_t rtp2435_get_width(uint8_t *header)
{
return header[6];
}
static inline void rtp2435_set_height(uint8_t *header, uint8_t height)
{
header[7] = height;
}
static inline uint8_t rtp2435_get_height(uint8_t *header)
{
return header[7];
}
static inline uint8_t *rtp2435_restart(uint8_t *header)
{
uint8_t t = rtp2435_get_type(header);
if (64 <= t && t <= 127)
return header + RTP_2435_HEADER_SIZE;
else
return NULL;
}
static inline uint8_t *rtp2435_quantization_table(uint8_t *header)
{
uint8_t q = rtp2435_get_q(header);
if (128 <= q && q <= 255) {
uint8_t *p;
if ((p = rtp2435_restart(header)))
return p + RTP_2435_RESTART_HEADER_SIZE;
else
return header + RTP_2435_HEADER_SIZE;
}
return NULL;
}
/*
* Reminder : Restart Marker header
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Restart Interval |F|L| Restart Count |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
static inline void rtp2435r_set_first(uint8_t *header)
{
header[2] |= 0x1;
}
static inline void rtp2435r_clear_first(uint8_t *header)
{
header[2] &= ~0x1;
}
static inline bool rtp2435r_check_first(uint8_t *header)
{
return !!(header[2] & 0x1);
}
static inline void rtp2435r_set_last(uint8_t *header)
{
header[2] |= 0x2;
}
static inline void rtp2435r_clear_last(uint8_t *header)
{
header[2] &= ~0x2;
}
static inline bool rtp2435r_check_last(uint8_t *header)
{
return !!(header[2] & 0x2);
}
static inline uint16_t rtp2435r_get_count(uint8_t *header)
{
return (header[2] << 8 | header[3]) >> 2;
}
static inline void rtp2435r_set_count(uint8_t *header, uint16_t count)
{
count = count << 2;
header[2] |= count >> 8;
header[3] = count & 0xFF;
}
static inline uint16_t rtp2435r_get_interval(uint8_t *header)
{
return header[0] << 8 | header[1];
}
static inline void rtp2435r_set_interval(uint8_t *header, uint16_t interval)
{
header[0] = (interval & 0xFF00) >> 8;
header[1] = interval & 0xFF;
}
/*
* Reminder : Quantization Table header
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MBZ | Precision | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Quantization Table Data |
| ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
static inline void rtp2435q_set_mbz(uint8_t *header, uint8_t mbz)
{
header[0] = mbz;
}
static inline uint8_t rtp2435q_get_mbz(uint8_t *header)
{
return header[0];
}
static inline void rtp2435q_set_precision(uint8_t *header, uint8_t precision)
{
header[1] = precision;
}
static inline uint8_t rtp2435q_get_precision(uint8_t *header)
{
return header[1];
}
static inline uint16_t rtp2435q_get_length(uint8_t *header)
{
return header[2] << 16 | header[3];
}
static inline void rtp2435q_set_length(uint8_t *header, uint16_t length)
{
header[2] = (length & 0xFF00) >> 8;
header[3] = length & 0xFF;
}
#ifdef __cplusplus
}
#endif
#endif /* !__BITSTREAM_IETF_RTP2435_H__ */

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