text: /*
   * RTP packetization for MPEG video
   * Copyright (c) 2002 Fabrice Bellard
   * 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 "libavcodec/mpegvideo.h"
  #include "avformat.h"
  #include "rtpenc.h"
  
  /* NOTE: a single frame must be passed with sequence header if
     needed. XXX: use slices. */
  void ff_rtp_send_mpegvideo(AVFormatContext *s1, const uint8_t *buf1, int size)
  {
      RTPMuxContext *s = s1->priv_data;
      int len, h, max_packet_size;
      uint8_t *q;
      const uint8_t *end = buf1 + size;
      int begin_of_slice, end_of_slice, frame_type, temporal_reference;
  
      max_packet_size = s->max_payload_size;
      begin_of_slice = 1;
      end_of_slice = 0;
      frame_type = 0;
      temporal_reference = 0;
  
      while (size > 0) {
          int begin_of_sequence;
  
          begin_of_sequence = 0;
          len = max_packet_size - 4;
  
          if (len >= size) {
              len = size;
              end_of_slice = 1;
          } else {
              const uint8_t *r, *r1;
              int start_code;
  
              r1 = buf1;
              while (1) {
                  start_code = -1;
                  r = ff_find_start_code(r1, end, &start_code);
                  if((start_code & 0xFFFFFF00) == 0x100) {
                      /* New start code found */
                      if (start_code == 0x100) {
                          frame_type = (r[1] & 0x38) >> 3;
                          temporal_reference = (int)r[0] << 2 | r[1] >> 6;
                      }
                      if (start_code == 0x1B8) {
                          begin_of_sequence = 1;
                      }
  
                      if (r - buf1 - 4 <= len) {
                          /* The current slice fits in the packet */
                          if (begin_of_slice == 0) {
                              /* no slice at the beginning of the packet... */
                              end_of_slice = 1;
                              len = r - buf1 - 4;
                              break;
                          }
                          r1 = r;
                      } else {
                          if ((r1 - buf1 > 4) && (r - r1 < max_packet_size)) {
                              len = r1 - buf1 - 4;
                              end_of_slice = 1;
                          }
                          break;
                      }
                  } else {
                      break;
                  }
              }
          }
  
          h = 0;
          h |= temporal_reference << 16;
          h |= begin_of_sequence << 13;
          h |= begin_of_slice << 12;
          h |= end_of_slice << 11;
          h |= frame_type << 8;
  
          q = s->buf;
          *q++ = h >> 24;
          *q++ = h >> 16;
          *q++ = h >> 8;
          *q++ = h;
  
          memcpy(q, buf1, len);
          q += len;
  
          /* 90kHz time stamp */
          s->timestamp = s->cur_timestamp;
          ff_rtp_send_data(s1, s->buf, q - s->buf, (len == size));
  
          buf1 += len;
          size -= len;
          begin_of_slice = end_of_slice;
          end_of_slice = 0;
      }
  }
  
  
  