69 lines
2.0 KiB
C++
69 lines
2.0 KiB
C++
#include "rtp-ext.h"
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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// https://datatracker.ietf.org/doc/html/draft-ietf-avtext-framemarking-13
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/*
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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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| ID=? | L=2 |S|E|I|D|B| TID | LID | TL0PICIDX |
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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or
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| ID=? | L=1 |S|E|I|D|B| TID | LID | (TL0PICIDX omitted)
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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or
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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| ID=? | L=0 |S|E|I|D|B| TID | (LID and TL0PICIDX omitted)
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*/
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int rtp_ext_frame_marking_parse(const uint8_t* data, int bytes, struct rtp_ext_frame_marking_t *ext)
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{
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memset(ext, 0, sizeof(*ext));
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if (bytes-- > 0)
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{
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ext->s = (data[0] >> 7) & 0x01;
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ext->e = (data[0] >> 6) & 0x01;
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ext->i = (data[0] >> 5) & 0x01;
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ext->d = (data[0] >> 4) & 0x01;
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ext->b = (data[0] >> 3) & 0x01;
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ext->tid = data[0] & 0x07;
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}
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if (bytes-- > 0)
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ext->lid = data[1];
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if (bytes > 0)
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ext->tl0_pic_idx = data[2];
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return 0;
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}
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int rtp_ext_frame_marking_write(uint8_t* data, int bytes, const struct rtp_ext_frame_marking_t* ext)
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{
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int len;
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len = 1 + ((ext->lid || ext->tl0_pic_idx) ? 1 : 0) + (ext->tl0_pic_idx ? 1 : 0);
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if (bytes < len)
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return -1;
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data[0] = ext->s ? 0x80 : 0x00;
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data[0] |= ext->e ? 0x40 : 0x00;
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data[0] |= ext->i ? 0x20 : 0x00;
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data[0] |= ext->d ? 0x10 : 0x00;
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data[0] |= ext->b ? 0x08 : 0x00;
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data[0] |= ext->tid;
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if (ext->lid || ext->tl0_pic_idx)
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data[1] = (uint8_t)ext->lid;
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if (ext->tl0_pic_idx)
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data[2] = (uint8_t)ext->tl0_pic_idx;
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return len;
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}
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