2 * copyright (c) 2007 Luca Abeni
4 * This file is part of FFmpeg.
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.
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.
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
24 #define MAX_FRAMES_PER_PACKET (s->max_frames_per_packet ? s->max_frames_per_packet : 5)
25 #define MAX_AU_HEADERS_SIZE (2 + 2 * MAX_FRAMES_PER_PACKET)
27 void ff_rtp_send_aac(AVFormatContext *s1, const uint8_t *buff, int size)
29 RTPMuxContext *s = s1->priv_data;
30 int len, max_packet_size;
33 /* skip ADTS header, if present */
34 if ((s1->streams[0]->codec->extradata_size) == 0) {
38 max_packet_size = s->max_payload_size - MAX_AU_HEADERS_SIZE;
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) > max_packet_size)) {
43 int au_size = s->num_frames * 2;
45 p = s->buf + MAX_AU_HEADERS_SIZE - au_size - 2;
47 memmove(p + 2, s->buf + 2, au_size);
49 /* Write the AU header size */
50 p[0] = ((au_size * 8) & 0xFF) >> 8;
51 p[1] = (au_size * 8) & 0xFF;
53 ff_rtp_send_data(s1, p, s->buf_ptr - p, 1);
57 if (s->num_frames == 0) {
58 s->buf_ptr = s->buf + MAX_AU_HEADERS_SIZE;
59 s->timestamp = s->cur_timestamp;
62 if (size < max_packet_size) {
63 p = s->buf + s->num_frames++ * 2 + 2;
65 *p = (size & 0x1F) << 3;
66 memcpy(s->buf_ptr, buff, size);
69 if (s->buf_ptr != s->buf + MAX_AU_HEADERS_SIZE) {
70 av_log(s1, AV_LOG_ERROR, "Strange...\n");
73 max_packet_size = s->max_payload_size - 4;
78 len = FFMIN(size, max_packet_size);
80 p[3] = (size & 0x1F) << 3;
81 memcpy(p + 4, buff, len);
82 ff_rtp_send_data(s1, p, len + 4, len == size);