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2ba45a60 DM |
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 "avformat.h" | |
22 | #include "rtpenc.h" | |
23 | ||
24 | ||
25 | void ff_rtp_send_aac(AVFormatContext *s1, const uint8_t *buff, int size) | |
26 | { | |
27 | RTPMuxContext *s = s1->priv_data; | |
28 | int len, max_packet_size; | |
29 | uint8_t *p; | |
30 | const int max_frames_per_packet = s->max_frames_per_packet ? s->max_frames_per_packet : 5; | |
31 | const int max_au_headers_size = 2 + 2 * max_frames_per_packet; | |
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 | if ((s->num_frames == max_frames_per_packet) || (len && (len + size) > s->max_payload_size)) { | |
43 | int au_size = s->num_frames * 2; | |
44 | ||
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 >> 5; | |
51 | p[1] = (au_size & 0x1F) << 3; | |
52 | ||
53 | ff_rtp_send_data(s1, p, s->buf_ptr - p, 1); | |
54 | ||
55 | s->num_frames = 0; | |
56 | } | |
57 | if (s->num_frames == 0) { | |
58 | s->buf_ptr = s->buf + max_au_headers_size; | |
59 | s->timestamp = s->cur_timestamp; | |
60 | } | |
61 | ||
62 | if (size <= max_packet_size) { | |
63 | p = s->buf + s->num_frames++ * 2 + 2; | |
64 | *p++ = size >> 5; | |
65 | *p = (size & 0x1F) << 3; | |
66 | memcpy(s->buf_ptr, buff, size); | |
67 | s->buf_ptr += size; | |
68 | } else { | |
69 | int au_size = size; | |
70 | ||
71 | max_packet_size = s->max_payload_size - 4; | |
72 | p = s->buf; | |
73 | p[0] = 0; | |
74 | p[1] = 16; | |
75 | while (size > 0) { | |
76 | len = FFMIN(size, max_packet_size); | |
77 | p[2] = au_size >> 5; | |
78 | p[3] = (au_size & 0x1F) << 3; | |
79 | memcpy(p + 4, buff, len); | |
80 | ff_rtp_send_data(s1, p, len + 4, len == size); | |
81 | size -= len; | |
82 | buff += len; | |
83 | } | |
84 | } | |
85 | } |