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/*
* copyright (c) 2007 Luca Abeni
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
#include "rtp_aac.h"
#include "rtpenc.h"
#define MAX_FRAMES_PER_PACKET (s->max_frames_per_packet ? s->max_frames_per_packet : 5)
#define MAX_AU_HEADERS_SIZE (2 + 2 * MAX_FRAMES_PER_PACKET)
void ff_rtp_send_aac(AVFormatContext *s1, const uint8_t *buff, int size)
{
RTPMuxContext *s = s1->priv_data;
int len, max_packet_size;
uint8_t *p;
/* skip ADTS header, if present */
if ((s1->streams[0]->codec->extradata_size) == 0) {
size -= 7;
buff += 7;
}
max_packet_size = s->max_payload_size - MAX_AU_HEADERS_SIZE;
/* test if the packet must be sent */
len = (s->buf_ptr - s->buf);
if ((s->num_frames == MAX_FRAMES_PER_PACKET) || (len && (len + size) > max_packet_size)) {
int au_size = s->num_frames * 2;
p = s->buf + MAX_AU_HEADERS_SIZE - au_size - 2;
if (p != s->buf) {
memmove(p + 2, s->buf + 2, au_size);
}
/* Write the AU header size */
p[0] = ((au_size * 8) & 0xFF) >> 8;
p[1] = (au_size * 8) & 0xFF;
ff_rtp_send_data(s1, p, s->buf_ptr - p, 1);
s->num_frames = 0;
}
if (s->num_frames == 0) {
s->buf_ptr = s->buf + MAX_AU_HEADERS_SIZE;
s->timestamp = s->cur_timestamp;
}
if (size < max_packet_size) {
p = s->buf + s->num_frames++ * 2 + 2;
*p++ = size >> 5;
*p = (size & 0x1F) << 3;
memcpy(s->buf_ptr, buff, size);
s->buf_ptr += size;
} else {
if (s->buf_ptr != s->buf + MAX_AU_HEADERS_SIZE) {
av_log(s1, AV_LOG_ERROR, "Strange...\n");
av_abort();
}
max_packet_size = s->max_payload_size - 4;
p = s->buf;
p[0] = 0;
p[1] = 16;
while (size > 0) {
len = FFMIN(size, max_packet_size);
p[2] = len >> 5;
p[3] = (size & 0x1F) << 3;
memcpy(p + 4, buff, len);
ff_rtp_send_data(s1, p, len + 4, len == size);
size -= len;
buff += len;
}
}
}
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