Statistics
| Branch: | Revision:

ffmpeg / libavformat / rtpenc_h264.c @ a23c9c4a

History | View | Annotate | Download (2.47 KB)

1
/*
2
 * RTP packetization for H.264 (RFC3984)
3
 * Copyright (c) 2008 Luca Abeni.
4
 *
5
 * This file is part of FFmpeg.
6
 *
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.
11
 *
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.
16
 *
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
20
 */
21

    
22
/**
23
 * @file rtpenc_h264.c
24
 * @brief H.264 packetization
25
 * @author Luca Abeni <lucabe72@email.it>
26
 */
27

    
28
#include "avformat.h"
29
#include "avc.h"
30
#include "rtp_h264.h"
31

    
32
static void nal_send(AVFormatContext *s1, const uint8_t *buf, int size, int last)
33
{
34
    RTPDemuxContext *s = s1->priv_data;
35

    
36
    av_log(s1, AV_LOG_DEBUG, "Sending NAL %x of len %d M=%d\n", buf[0] & 0x1F, size, last);
37
    if (size <= s->max_payload_size) {
38
        ff_rtp_send_data(s1, buf, size, last);
39
    } else {
40
        uint8_t type = buf[0] & 0x1F;
41
        uint8_t nri = buf[0] & 0x60;
42

    
43
        av_log(s1, AV_LOG_DEBUG, "NAL size %d > %d\n", size, s->max_payload_size);
44
        s->buf[0] = 28;        /* FU Indicator; Type = 28 ---> FU-A */
45
        s->buf[0] |= nri;
46
        s->buf[1] = type;
47
        s->buf[1] |= 1 << 7;
48
        buf += 1;
49
        size -= 1;
50
        while (size + 2 > s->max_payload_size) {
51
            memcpy(&s->buf[2], buf, s->max_payload_size - 2);
52
            ff_rtp_send_data(s1, s->buf, s->max_payload_size, 0);
53
            buf += s->max_payload_size - 2;
54
            size -= s->max_payload_size - 2;
55
            s->buf[1] &= ~(1 << 7);
56
        }
57
        s->buf[1] |= 1 << 6;
58
        memcpy(&s->buf[2], buf, size);
59
        ff_rtp_send_data(s1, s->buf, size + 2, 1);
60
    }
61
}
62

    
63
void ff_rtp_send_h264(AVFormatContext *s1, uint8_t *buf1, int size)
64
{
65
    uint8_t *r;
66
    RTPDemuxContext *s = s1->priv_data;
67

    
68
    s->timestamp = s->cur_timestamp;
69
    r = ff_avc_find_startcode(buf1, buf1 + size);
70
    while (r < buf1 + size) {
71
        uint8_t *r1;
72

    
73
        while(!*(r++));
74
        r1 = ff_avc_find_startcode(r, buf1 + size);
75
        nal_send(s1, r, r1 - r, (r1 == buf1 + size));
76
        r = r1;
77
    }
78
}