blob: fad8ea2a5b33282a27b737abc17037345f76cb1f
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 | |
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 |