Statistics
| Branch: | Revision:

ffmpeg / libavformat / rtp_aac.c @ 8537591a

History | View | Annotate | Download (2.76 KB)

1 171dce48 Luca Abeni
/*
2
 * copyright (c) 2007 Luca Abeni
3
 *
4
 * This file is part of FFmpeg.
5
 *
6
 * FFmpeg is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2.1 of the License, or (at your option) any later version.
10
 *
11
 * FFmpeg is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
16
 * You should have received a copy of the GNU Lesser General Public
17
 * License along with FFmpeg; if not, write to the Free Software
18
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
 */
20
21
#include "avformat.h"
22 302879cb Luca Abeni
#include "rtpenc.h"
23 171dce48 Luca Abeni
24 e0d21bfe Luca Abeni
#define MAX_FRAMES_PER_PACKET (s->max_frames_per_packet ? s->max_frames_per_packet : 5)
25 171dce48 Luca Abeni
#define MAX_AU_HEADERS_SIZE (2 + 2 * MAX_FRAMES_PER_PACKET)
26
27
void ff_rtp_send_aac(AVFormatContext *s1, const uint8_t *buff, int size)
28
{
29 302879cb Luca Abeni
    RTPMuxContext *s = s1->priv_data;
30 171dce48 Luca Abeni
    int len, max_packet_size;
31
    uint8_t *p;
32
33
    /* skip ADTS header, if present */
34
    if ((s1->streams[0]->codec->extradata_size) == 0) {
35
        size -= 7;
36
        buff += 7;
37
    }
38
    max_packet_size = s->max_payload_size - MAX_AU_HEADERS_SIZE;
39
40
    /* test if the packet must be sent */
41
    len = (s->buf_ptr - s->buf);
42 21da81d7 Luca Abeni
    if ((s->num_frames == MAX_FRAMES_PER_PACKET) || (len && (len + size) > max_packet_size)) {
43
        int au_size = s->num_frames * 2;
44 171dce48 Luca Abeni
45
        p = s->buf + MAX_AU_HEADERS_SIZE - au_size - 2;
46
        if (p != s->buf) {
47
            memmove(p + 2, s->buf + 2, au_size);
48
        }
49
        /* Write the AU header size */
50
        p[0] = ((au_size * 8) & 0xFF) >> 8;
51
        p[1] = (au_size * 8) & 0xFF;
52
53
        ff_rtp_send_data(s1, p, s->buf_ptr - p, 1);
54
55 21da81d7 Luca Abeni
        s->num_frames = 0;
56 171dce48 Luca Abeni
    }
57 21da81d7 Luca Abeni
    if (s->num_frames == 0) {
58 171dce48 Luca Abeni
        s->buf_ptr = s->buf + MAX_AU_HEADERS_SIZE;
59
        s->timestamp = s->cur_timestamp;
60
    }
61
62
    if (size < max_packet_size) {
63 21da81d7 Luca Abeni
        p = s->buf + s->num_frames++ * 2 + 2;
64 171dce48 Luca Abeni
        *p++ = size >> 5;
65
        *p = (size & 0x1F) << 3;
66
        memcpy(s->buf_ptr, buff, size);
67
        s->buf_ptr += size;
68
    } else {
69 1a3a0a79 Luca Abeni
        if (s->buf_ptr != s->buf + MAX_AU_HEADERS_SIZE) {
70
            av_log(s1, AV_LOG_ERROR, "Strange...\n");
71
            av_abort();
72
        }
73
        max_packet_size = s->max_payload_size - 4;
74
        p = s->buf;
75
        p[0] = 0;
76
        p[1] = 16;
77
        while (size > 0) {
78
            len = FFMIN(size, max_packet_size);
79
            p[2] = len >> 5;
80
            p[3] = (size & 0x1F) << 3;
81
            memcpy(p + 4, buff, len);
82
            ff_rtp_send_data(s1, p, len + 4, len == size);
83
            size -= len;
84
            buff += len;
85
        }
86 171dce48 Luca Abeni
    }
87
}