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249 lines
6.6 KiB
249 lines
6.6 KiB
/*****************************************************************************
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* rtp2435.h: RFC Profile for JPEG
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*****************************************************************************
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* Copyright (C) 2019 Josh de Kock
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*
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* Authors: Josh de Kock <josh@itanimul.li>
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject
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* to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*****************************************************************************/
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/*
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* RTP Payload Format for JPEG
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*/
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#ifndef __BITSTREAM_IETF_RTP2435_H__
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#define __BITSTREAM_IETF_RTP2435_H__
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#define RTP_2435_HEADER_SIZE 8
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#define RTP_2435_RESTART_HEADER_SIZE 4
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#define RTP_2435_QUANTIZATION_HEADER_SIZE 4
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/*
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* Reminder : JPEG header which immediately follows the RTP header
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0 1 2 3
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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
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Type-specific | Fragment Offset |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Type | Q | Width | Height |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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static inline void rtp2435_set_ts(uint8_t *header, uint8_t ts)
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{
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header[0] = ts;
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}
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static inline uint8_t rtp2435_get_ts(uint8_t *header)
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{
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return header[0];
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}
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static inline void rtp2435_set_offset(uint8_t *header, uint32_t offset)
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{
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header[1] = (offset & 0xFF0000) >> 16;
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header[2] = (offset & 0xFF00) >> 8;
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header[3] = offset & 0xFF;
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}
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static inline uint32_t rtp2435_get_offset(uint8_t *header)
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{
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return header[1] << 16 | header[2] << 8 | header[3];
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}
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static inline void rtp2435_set_type(uint8_t *header, uint8_t type)
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{
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header[4] = type;
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}
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static inline uint8_t rtp2435_get_type(uint8_t *header)
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{
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return header[4];
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}
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static inline void rtp2435_set_q(uint8_t *header, uint8_t q)
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{
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header[5] = q;
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}
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static inline uint8_t rtp2435_get_q(uint8_t *header)
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{
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return header[5];
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}
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static inline void rtp2435_set_width(uint8_t *header, uint8_t width)
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{
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header[6] = width;
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}
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static inline uint8_t rtp2435_get_width(uint8_t *header)
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{
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return header[6];
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}
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static inline void rtp2435_set_height(uint8_t *header, uint8_t height)
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{
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header[7] = height;
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}
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static inline uint8_t rtp2435_get_height(uint8_t *header)
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{
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return header[7];
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}
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static inline uint8_t *rtp2435_restart(uint8_t *header)
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{
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uint8_t t = rtp2435_get_type(header);
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if (64 <= t && t <= 127)
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return header + RTP_2435_HEADER_SIZE;
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else
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return NULL;
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}
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static inline uint8_t *rtp2435_quantization_table(uint8_t *header)
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{
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uint8_t q = rtp2435_get_q(header);
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if (128 <= q && q <= 255) {
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uint8_t *p;
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if ((p = rtp2435_restart(header)))
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return p + RTP_2435_RESTART_HEADER_SIZE;
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else
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return header + RTP_2435_HEADER_SIZE;
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}
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return NULL;
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}
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/*
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* Reminder : Restart Marker header
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0 1 2 3
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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
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Restart Interval |F|L| Restart Count |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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static inline void rtp2435r_set_first(uint8_t *header)
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{
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header[2] |= 0x1;
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}
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static inline void rtp2435r_clear_first(uint8_t *header)
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{
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header[2] &= ~0x1;
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}
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static inline bool rtp2435r_check_first(uint8_t *header)
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{
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return !!(header[2] & 0x1);
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}
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static inline void rtp2435r_set_last(uint8_t *header)
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{
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header[2] |= 0x2;
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}
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static inline void rtp2435r_clear_last(uint8_t *header)
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{
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header[2] &= ~0x2;
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}
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static inline bool rtp2435r_check_last(uint8_t *header)
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{
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return !!(header[2] & 0x2);
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}
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static inline uint16_t rtp2435r_get_count(uint8_t *header)
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{
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return (header[2] << 8 | header[3]) >> 2;
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}
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static inline void rtp2435r_set_count(uint8_t *header, uint16_t count)
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{
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count = count << 2;
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header[2] |= count >> 8;
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header[3] = count & 0xFF;
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}
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static inline uint16_t rtp2435r_get_interval(uint8_t *header)
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{
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return header[0] << 8 | header[1];
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}
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static inline void rtp2435r_set_interval(uint8_t *header, uint16_t interval)
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{
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header[0] = (interval & 0xFF00) >> 8;
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header[1] = interval & 0xFF;
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}
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/*
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* Reminder : Quantization Table header
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0 1 2 3
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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
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| MBZ | Precision | Length |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| Quantization Table Data |
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| ... |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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static inline void rtp2435q_set_mbz(uint8_t *header, uint8_t mbz)
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{
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header[0] = mbz;
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}
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static inline uint8_t rtp2435q_get_mbz(uint8_t *header)
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{
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return header[0];
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}
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static inline void rtp2435q_set_precision(uint8_t *header, uint8_t precision)
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{
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header[1] = precision;
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}
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static inline uint8_t rtp2435q_get_precision(uint8_t *header)
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{
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return header[1];
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}
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static inline uint16_t rtp2435q_get_length(uint8_t *header)
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{
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return header[2] << 16 | header[3];
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}
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static inline void rtp2435q_set_length(uint8_t *header, uint16_t length)
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{
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header[2] = (length & 0xFF00) >> 8;
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header[3] = length & 0xFF;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* !__BITSTREAM_IETF_RTP2435_H__ */
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