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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 "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. }
  86.