/*
  * 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 "rtpenc.h"

 
 
 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;

     const int max_frames_per_packet = s->max_frames_per_packet ? s->max_frames_per_packet : 5;
     const int max_au_headers_size = 2 + 2 * max_frames_per_packet;

 
     /* 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) > s->max_payload_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 {

         int au_size = size;
 

         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] = au_size >> 5;
             p[3] = (au_size & 0x1F) << 3;

             memcpy(p + 4, buff, len);
             ff_rtp_send_data(s1, p, len + 4, len == size);
             size -= len;
             buff += len;
         }

     }
 }