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  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]->codec->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.