1 /*
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 "libavutil/intreadwrite.h"
22
23 #include "avformat.h"
24 #include "rtpenc.h"
25
26
ff_rtp_send_aac(AVFormatContext * s1,const uint8_t * buff,int size)27 void ff_rtp_send_aac(AVFormatContext *s1, const uint8_t *buff, int size)
28 {
29 RTPMuxContext *s = s1->priv_data;
30 AVStream *st = s1->streams[0];
31 const int max_au_headers_size = 2 + 2 * s->max_frames_per_packet;
32 int len, max_packet_size = s->max_payload_size - max_au_headers_size;
33 uint8_t *p;
34
35 /* skip ADTS header, if present */
36 if ((s1->streams[0]->codecpar->extradata_size) == 0) {
37 size -= 7;
38 buff += 7;
39 }
40
41 /* test if the packet must be sent */
42 len = (s->buf_ptr - s->buf);
43 if (s->num_frames &&
44 (s->num_frames == s->max_frames_per_packet ||
45 (len + size) > s->max_payload_size ||
46 av_compare_ts(s->cur_timestamp - s->timestamp, st->time_base,
47 s1->max_delay, AV_TIME_BASE_Q) >= 0)) {
48 int au_size = s->num_frames * 2;
49
50 p = s->buf + max_au_headers_size - au_size - 2;
51 if (p != s->buf) {
52 memmove(p + 2, s->buf + 2, au_size);
53 }
54 /* Write the AU header size */
55 AV_WB16(p, au_size * 8);
56
57 ff_rtp_send_data(s1, p, s->buf_ptr - p, 1);
58
59 s->num_frames = 0;
60 }
61 if (s->num_frames == 0) {
62 s->buf_ptr = s->buf + max_au_headers_size;
63 s->timestamp = s->cur_timestamp;
64 }
65
66 if (size <= max_packet_size) {
67 p = s->buf + s->num_frames++ * 2 + 2;
68 AV_WB16(p, size * 8);
69 memcpy(s->buf_ptr, buff, size);
70 s->buf_ptr += size;
71 } else {
72 int au_size = size;
73
74 max_packet_size = s->max_payload_size - 4;
75 p = s->buf;
76 AV_WB16(p, 2 * 8);
77 while (size > 0) {
78 len = FFMIN(size, max_packet_size);
79 AV_WB16(&p[2], au_size * 8);
80 memcpy(p + 4, buff, len);
81 ff_rtp_send_data(s1, p, len + 4, len == size);
82 size -= len;
83 buff += len;
84 }
85 }
86 }
87