mirror of
https://github.com/librempeg/librempeg
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81 lines
2.3 KiB
C
81 lines
2.3 KiB
C
/*
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* RTP packetization for H.263 video
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* Copyright (c) 2009 Luca Abeni
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* Copyright (c) 2009 Martin Storsjo
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "rtpenc.h"
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static const uint8_t *find_resync_marker_reverse(const uint8_t *restrict start,
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const uint8_t *restrict end)
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{
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const uint8_t *p = end - 1;
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start += 1; /* Make sure we never return the original start. */
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for (; p > start; p -= 2) {
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if (!*p) {
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if (!p[ 1] && p[2]) return p;
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else if (!p[-1] && p[1]) return p - 1;
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}
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}
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return end;
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}
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/**
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* Packetize H.263 frames into RTP packets according to RFC 4629
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*/
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void ff_rtp_send_h263(AVFormatContext *s1, const uint8_t *buf1, int size)
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{
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RTPMuxContext *s = s1->priv_data;
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int len, max_packet_size;
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uint8_t *q;
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max_packet_size = s->max_payload_size;
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while (size > 0) {
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q = s->buf;
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if (size >= 2 && (buf1[0] == 0) && (buf1[1] == 0)) {
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*q++ = 0x04;
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buf1 += 2;
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size -= 2;
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} else {
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*q++ = 0;
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}
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*q++ = 0;
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len = FFMIN(max_packet_size - 2, size);
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/* Look for a better place to split the frame into packets. */
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if (len < size) {
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const uint8_t *end = find_resync_marker_reverse(buf1, buf1 + len);
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len = end - buf1;
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}
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memcpy(q, buf1, len);
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q += len;
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/* 90 KHz time stamp */
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s->timestamp = s->cur_timestamp;
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ff_rtp_send_data(s1, s->buf, q - s->buf, (len == size));
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buf1 += len;
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size -= len;
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}
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}
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