/*
  * RTP packetization for H.264 (RFC3984)

  * Copyright (c) 2008 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
  */
 
 /**

  * @file libavformat/rtpenc_h264.c

  * @brief H.264 packetization
  * @author Luca Abeni <lucabe72@email.it>
  */
 
 #include "avformat.h"
 #include "avc.h"

 #include "rtpenc.h"

 
 static void nal_send(AVFormatContext *s1, const uint8_t *buf, int size, int last)
 {

     RTPMuxContext *s = s1->priv_data;

 
     av_log(s1, AV_LOG_DEBUG, "Sending NAL %x of len %d M=%d\n", buf[0] & 0x1F, size, last);
     if (size <= s->max_payload_size) {
         ff_rtp_send_data(s1, buf, size, last);
     } else {
         uint8_t type = buf[0] & 0x1F;
         uint8_t nri = buf[0] & 0x60;
 
         av_log(s1, AV_LOG_DEBUG, "NAL size %d > %d\n", size, s->max_payload_size);
         s->buf[0] = 28;        /* FU Indicator; Type = 28 ---> FU-A */
         s->buf[0] |= nri;
         s->buf[1] = type;
         s->buf[1] |= 1 << 7;
         buf += 1;
         size -= 1;
         while (size + 2 > s->max_payload_size) {
             memcpy(&s->buf[2], buf, s->max_payload_size - 2);
             ff_rtp_send_data(s1, s->buf, s->max_payload_size, 0);
             buf += s->max_payload_size - 2;
             size -= s->max_payload_size - 2;
             s->buf[1] &= ~(1 << 7);
         }
         s->buf[1] |= 1 << 6;
         memcpy(&s->buf[2], buf, size);
         ff_rtp_send_data(s1, s->buf, size + 2, 1);
     }
 }
 

 void ff_rtp_send_h264(AVFormatContext *s1, const uint8_t *buf1, int size)

 {

     const uint8_t *r;

     RTPMuxContext *s = s1->priv_data;

 
     s->timestamp = s->cur_timestamp;
     r = ff_avc_find_startcode(buf1, buf1 + size);
     while (r < buf1 + size) {

         const uint8_t *r1;

 
         while(!*(r++));
         r1 = ff_avc_find_startcode(r, buf1 + size);
         nal_send(s1, r, r1 - r, (r1 == buf1 + size));
         r = r1;
     }
 }