2 * RTP packetization for H.264 (RFC3984)
3 * Copyright (c) 2008 Luca Abeni
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * @brief H.264 packetization
25 * @author Luca Abeni <lucabe72@email.it>
32 static const uint8_t *avc_mp4_find_startcode(const uint8_t *start, const uint8_t *end, int nal_length_size)
36 if (end - start < nal_length_size)
38 while (nal_length_size--)
39 res = (res << 8) | *start++;
41 if (start + res > end || res < 0 || start + res < start)
47 static void nal_send(AVFormatContext *s1, const uint8_t *buf, int size, int last)
49 RTPMuxContext *s = s1->priv_data;
51 av_log(s1, AV_LOG_DEBUG, "Sending NAL %x of len %d M=%d\n", buf[0] & 0x1F, size, last);
52 if (size <= s->max_payload_size) {
53 ff_rtp_send_data(s1, buf, size, last);
55 uint8_t type = buf[0] & 0x1F;
56 uint8_t nri = buf[0] & 0x60;
58 av_log(s1, AV_LOG_DEBUG, "NAL size %d > %d\n", size, s->max_payload_size);
59 s->buf[0] = 28; /* FU Indicator; Type = 28 ---> FU-A */
65 while (size + 2 > s->max_payload_size) {
66 memcpy(&s->buf[2], buf, s->max_payload_size - 2);
67 ff_rtp_send_data(s1, s->buf, s->max_payload_size, 0);
68 buf += s->max_payload_size - 2;
69 size -= s->max_payload_size - 2;
70 s->buf[1] &= ~(1 << 7);
73 memcpy(&s->buf[2], buf, size);
74 ff_rtp_send_data(s1, s->buf, size + 2, last);
78 void ff_rtp_send_h264(AVFormatContext *s1, const uint8_t *buf1, int size)
80 const uint8_t *r, *end = buf1 + size;
81 RTPMuxContext *s = s1->priv_data;
83 s->timestamp = s->cur_timestamp;
84 if (s->nal_length_size)
85 r = avc_mp4_find_startcode(buf1, end, s->nal_length_size) ? buf1 : end;
87 r = ff_avc_find_startcode(buf1, end);
91 if (s->nal_length_size) {
92 r1 = avc_mp4_find_startcode(r, end, s->nal_length_size);
95 r += s->nal_length_size;
98 r1 = ff_avc_find_startcode(r, end);
100 nal_send(s1, r, r1 - r, r1 == end);