text: /*
   * frame CRC encoder (for codec/format testing)
   * Copyright (c) 2002 Fabrice Bellard
   *
   * 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 "XMFFmpeg/libavutil/adler32.h"
  #include "internal.h"
  
  static int framecrc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
  {
      uint32_t crc = av_adler32_update(0, pkt->data, pkt->size);
      char buf[256];
  
      snprintf(buf, sizeof(buf), "%d, %" PRId64 ", %d, 0x%08x\n", pkt->stream_index, pkt->dts, pkt->size, crc);
      avio_write(s->pb, (const unsigned char *)buf, strlen(buf));
      avio_flush(s->pb);
      return 0;
  }
  
  AVOutputFormat ff_framecrc_muxer = {
      /*.name              = */	"framecrc",
      /*.long_name         = */	NULL_IF_CONFIG_SMALL("framecrc testing format"),
      /*.mime_type         = */	0,
      /*.extensions        = */	0,
  	/*.priv_data_size	 = */	0,
      /*.audio_codec       = */	CODEC_ID_PCM_S16LE,
      /*.video_codec       = */	CODEC_ID_RAWVIDEO,
      /*.write_header      = */	0,
      /*.write_packet      = */	framecrc_write_packet,
      /*.write_trailer     = */	0,
  	/*.flags			 = */	AVFMT_VARIABLE_FPS,
  };
  