Statistics
| Branch: | Revision:

ffmpeg / libavformat / rtp_mpv.c @ d7fb5a18

History | View | Annotate | Download (3.61 KB)

1
/*
2
 * RTP packetization for MPEG video
3
 * Copyright (c) 2002 Fabrice Bellard.
4
 * Copyright (c) 2007 Luca Abeni.
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22

    
23
#include "libavcodec/mpegvideo.h"
24
#include "avformat.h"
25
#include "rtp_internal.h"
26

    
27
/* NOTE: a single frame must be passed with sequence header if
28
   needed. XXX: use slices. */
29
void ff_rtp_send_mpegvideo(AVFormatContext *s1, const uint8_t *buf1, int size)
30
{
31
    RTPDemuxContext *s = s1->priv_data;
32
    int len, h, max_packet_size;
33
    uint8_t *q;
34
    int begin_of_slice, end_of_slice, frame_type, temporal_reference;
35

    
36
    max_packet_size = s->max_payload_size;
37
    begin_of_slice = 1;
38
    end_of_slice = 0;
39
    frame_type = 0;
40
    temporal_reference = 0;
41

    
42
    while (size > 0) {
43
        int begin_of_sequence;
44

    
45
        begin_of_sequence = 0;
46
        len = max_packet_size - 4;
47

    
48
        if (len >= size) {
49
            len = size;
50
            end_of_slice = 1;
51
        } else {
52
            const uint8_t *r, *r1;
53
            int start_code;
54

    
55
            r1 = buf1;
56
            while (1) {
57
                start_code = -1;
58
                r = ff_find_start_code(r1, buf1 + size, &start_code);
59
                if((start_code & 0xFFFFFF00) == 0x100) {
60
                    /* New start code found */
61
                    if (start_code == 0x100) {
62
                        frame_type = (r[1] & 0x38) >> 3;
63
                        temporal_reference = (int)r[0] << 2 | r[1] >> 6;
64
                    }
65
                    if (start_code == 0x1B8) {
66
                        begin_of_sequence = 1;
67
                    }
68

    
69
                    if (r - buf1 - 4 <= len) {
70
                        /* The current slice fits in the packet */
71
                        if (begin_of_slice == 0) {
72
                            /* no slice at the beginning of the packet... */
73
                            end_of_slice = 1;
74
                            len = r - buf1 - 4;
75
                            break;
76
                        }
77
                        r1 = r;
78
                    } else {
79
                        if ((r1 - buf1 > 4) && (r - r1 < max_packet_size)) {
80
                            len = r1 - buf1 - 4;
81
                            end_of_slice = 1;
82
                        }
83
                        break;
84
                    }
85
                } else {
86
                    break;
87
                }
88
            }
89
        }
90

    
91
        h = 0;
92
        h |= temporal_reference << 16;
93
        h |= begin_of_sequence << 13;
94
        h |= begin_of_slice << 12;
95
        h |= end_of_slice << 11;
96
        h |= frame_type << 8;
97

    
98
        q = s->buf;
99
        *q++ = h >> 24;
100
        *q++ = h >> 16;
101
        *q++ = h >> 8;
102
        *q++ = h;
103

    
104
        memcpy(q, buf1, len);
105
        q += len;
106

    
107
        /* 90kHz time stamp */
108
        s->timestamp = s->cur_timestamp;
109
        ff_rtp_send_data(s1, s->buf, q - s->buf, (len == size));
110

    
111
        buf1 += len;
112
        size -= len;
113
        begin_of_slice = end_of_slice;
114
        end_of_slice = 0;
115
    }
116
}
117

    
118