/***************************************************************************** * rtp2435.h: RFC Profile for JPEG ***************************************************************************** * Copyright (C) 2019 Josh de Kock * * Authors: Josh de Kock * * 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__ #include #include #include #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) { 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__ */