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299 lines
7.4 KiB
299 lines
7.4 KiB
/*****************************************************************************
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* ts.h: ISO/IEC 13818-1 Transport Stream
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*****************************************************************************
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* Copyright (C) 2009-2010 VideoLAN
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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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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* Normative references:
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* - ISO/IEC 13818-1:2007(E) (MPEG-2 systems)
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*/
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#ifndef __BITSTREAM_MPEG_TS_H__
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#define __BITSTREAM_MPEG_TS_H__
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#include <stdlib.h> /* malloc */
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#include <stdint.h> /* uint8_t, uint16_t, etc... */
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#include <stdbool.h> /* bool */
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#include <string.h> /* memset */
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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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/*****************************************************************************
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* TS header
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*****************************************************************************/
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#define TS_SIZE 188
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#define TS_HEADER_SIZE 4
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#define TS_HEADER_SIZE_AF 6
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#define TS_HEADER_SIZE_PCR 12
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#define TS_DECLARE(p_ts) \
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uint8_t p_ts[TS_SIZE]
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static inline uint8_t *ts_allocate(void)
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{
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return (uint8_t *)malloc(TS_SIZE * sizeof(uint8_t));
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}
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static inline void ts_init(uint8_t *p_ts)
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{
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p_ts[0] = 0x47;
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p_ts[1] = 0x0;
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p_ts[2] = 0x0;
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p_ts[3] = 0x0;
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}
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static inline void ts_set_transporterror(uint8_t *p_ts)
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{
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p_ts[1] |= 0x80;
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}
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static inline bool ts_get_transporterror(const uint8_t *p_ts)
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{
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return !!(p_ts[1] & 0x80);
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}
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static inline void ts_set_unitstart(uint8_t *p_ts)
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{
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p_ts[1] |= 0x40;
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}
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static inline bool ts_get_unitstart(const uint8_t *p_ts)
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{
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return !!(p_ts[1] & 0x40);
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}
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static inline void ts_set_transportpriority(uint8_t *p_ts)
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{
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p_ts[1] |= 0x20;
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}
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static inline bool ts_get_transportpriority(const uint8_t *p_ts)
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{
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return !!(p_ts[1] & 0x20);
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}
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static inline void ts_set_pid(uint8_t *p_ts, uint16_t i_pid)
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{
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p_ts[1] &= ~0x1f;
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p_ts[1] |= (i_pid >> 8) & 0x1f;
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p_ts[2] = i_pid & 0xff;
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}
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static inline uint16_t ts_get_pid(const uint8_t *p_ts)
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{
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return ((p_ts[1] & 0x1f) << 8) | p_ts[2];
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}
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static inline void ts_set_cc(uint8_t *p_ts, uint8_t i_cc)
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{
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p_ts[3] &= ~0xf;
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p_ts[3] |= (i_cc & 0xf);
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}
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static inline uint8_t ts_get_cc(const uint8_t *p_ts)
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{
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return p_ts[3] & 0xf;
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}
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static inline void ts_set_payload(uint8_t *p_ts)
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{
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p_ts[3] |= 0x10;
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}
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static inline bool ts_has_payload(const uint8_t *p_ts)
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{
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return !!(p_ts[3] & 0x10);
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}
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static inline void ts_set_adaptation(uint8_t *p_ts, uint8_t i_length)
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{
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p_ts[3] |= 0x20;
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p_ts[4] = i_length;
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if (i_length)
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p_ts[5] = 0x0;
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if (i_length > 1)
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memset(&p_ts[6], 0xff, i_length - 1); /* stuffing */
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}
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static inline bool ts_has_adaptation(const uint8_t *p_ts)
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{
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return !!(p_ts[3] & 0x20);
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}
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static inline uint8_t ts_get_adaptation(const uint8_t *p_ts)
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{
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return p_ts[4];
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}
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/* not technically defined in ISO-13818, but this seems to be the industry consensus */
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#define TS_SCRAMBLING_CLEAR 0
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#define TS_SCRAMBLING_EVEN 2
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#define TS_SCRAMBLING_ODD 3
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static inline void ts_set_scrambling(uint8_t *p_ts, uint8_t i_scrambling)
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{
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p_ts[3] &= ~0xc0;
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p_ts[3] |= i_scrambling << 6;
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}
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static inline uint8_t ts_get_scrambling(const uint8_t *p_ts)
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{
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return (p_ts[3] & 0xc0) >> 6;
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}
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static inline bool ts_validate(const uint8_t *p_ts)
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{
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return p_ts[0] == 0x47;
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}
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/*****************************************************************************
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* TS payload
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*****************************************************************************/
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static inline void ts_pad(uint8_t *p_ts)
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{
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ts_init(p_ts);
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ts_set_pid(p_ts, 0x1fff);
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ts_set_cc(p_ts, 0);
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ts_set_payload(p_ts);
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memset(p_ts + 4, 0xff, TS_SIZE - 4);
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}
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static inline uint8_t *ts_payload(uint8_t *p_ts)
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{
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if (!ts_has_payload(p_ts))
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return p_ts + TS_SIZE;
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if (!ts_has_adaptation(p_ts))
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return p_ts + TS_HEADER_SIZE;
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return p_ts + TS_HEADER_SIZE + 1 + ts_get_adaptation(p_ts);
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}
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static inline uint8_t *ts_section(uint8_t *p_ts)
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{
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if (!ts_get_unitstart(p_ts))
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return ts_payload(p_ts);
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return ts_payload(p_ts) + 1; /* pointer_field */
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}
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static inline uint8_t *ts_next_section(uint8_t *p_ts)
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{
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uint8_t *p_payload;
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if (!ts_get_unitstart(p_ts))
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return p_ts + TS_SIZE;
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p_payload = ts_payload(p_ts);
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if (p_payload >= p_ts + TS_SIZE)
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return p_ts + TS_SIZE;
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return p_payload + *p_payload + 1; /* pointer_field */
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}
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/*****************************************************************************
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* Adaptation field
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*****************************************************************************/
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static inline void tsaf_set_discontinuity(uint8_t *p_ts)
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{
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p_ts[5] |= 0x80;
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}
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static inline void tsaf_clear_discontinuity(uint8_t *p_ts)
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{
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p_ts[5] &= ~0x80;
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}
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static inline bool tsaf_has_discontinuity(const uint8_t *p_ts)
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{
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return !!(p_ts[5] & 0x80);
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}
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static inline void tsaf_set_randomaccess(uint8_t *p_ts)
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{
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p_ts[5] |= 0x40;
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}
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static inline bool tsaf_has_randomaccess(const uint8_t *p_ts)
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{
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return !!(p_ts[5] & 0x40);
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}
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static inline void tsaf_set_streampriority(uint8_t *p_ts)
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{
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p_ts[5] |= 0x20;
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}
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static inline void tsaf_set_pcr(uint8_t *p_ts, uint64_t i_pcr)
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{
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p_ts[5] |= 0x10;
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p_ts[6] = (i_pcr >> 25) & 0xff;
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p_ts[7] = (i_pcr >> 17) & 0xff;
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p_ts[8] = (i_pcr >> 9) & 0xff;
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p_ts[9] = (i_pcr >> 1) & 0xff;
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p_ts[10] = 0x7e | ((i_pcr << 7) & 0x80);
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p_ts[11] = 0;
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}
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static inline void tsaf_set_pcrext(uint8_t *p_ts, uint16_t i_pcr_ext)
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{
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p_ts[10] |= (i_pcr_ext >> 8) & 0x1;
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p_ts[11] = i_pcr_ext & 0xff;
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}
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static inline bool tsaf_has_pcr(const uint8_t *p_ts)
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{
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return !!(p_ts[5] & 0x10);
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}
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static inline uint64_t tsaf_get_pcr(const uint8_t *p_ts)
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{
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return ((uint64_t) p_ts[6] << 25) | (p_ts[7] << 17) | (p_ts[8] << 9) | (p_ts[9] << 1) |
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(p_ts[10] >> 7);
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}
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static inline uint64_t tsaf_get_pcrext(const uint8_t *p_ts)
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{
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return ((p_ts[10] & 1) << 8) | p_ts[11];
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}
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/*****************************************************************************
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* TS payload gathering
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*****************************************************************************/
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static inline bool ts_check_duplicate(uint8_t i_cc, uint8_t i_last_cc)
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{
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return i_last_cc == i_cc;
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}
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static inline bool ts_check_discontinuity(uint8_t i_cc, uint8_t i_last_cc)
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{
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return (i_last_cc + 17 - i_cc) % 16;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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