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  1. /*
  2.  * CRC encoder (for codec/format testing)
  3.  * Copyright (c) 2002 Fabrice Bellard
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include <inttypes.h>
  23.  
  24. #include "libavutil/adler32.h"
  25. #include "avformat.h"
  26.  
  27. typedef struct CRCState {
  28.     uint32_t crcval;
  29. } CRCState;
  30.  
  31. static int crc_write_header(struct AVFormatContext *s)
  32. {
  33.     CRCState *crc = s->priv_data;
  34.  
  35.     /* init CRC */
  36.     crc->crcval = 1;
  37.  
  38.     return 0;
  39. }
  40.  
  41. static int crc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
  42. {
  43.     CRCState *crc = s->priv_data;
  44.     crc->crcval = av_adler32_update(crc->crcval, pkt->data, pkt->size);
  45.     return 0;
  46. }
  47.  
  48. static int crc_write_trailer(struct AVFormatContext *s)
  49. {
  50.     CRCState *crc = s->priv_data;
  51.     char buf[64];
  52.  
  53.     snprintf(buf, sizeof(buf), "CRC=0x%08"PRIx32"\n", crc->crcval);
  54.     avio_write(s->pb, buf, strlen(buf));
  55.  
  56.     return 0;
  57. }
  58.  
  59. AVOutputFormat ff_crc_muxer = {
  60.     .name              = "crc",
  61.     .long_name         = NULL_IF_CONFIG_SMALL("CRC testing"),
  62.     .priv_data_size    = sizeof(CRCState),
  63.     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
  64.     .video_codec       = AV_CODEC_ID_RAWVIDEO,
  65.     .write_header      = crc_write_header,
  66.     .write_packet      = crc_write_packet,
  67.     .write_trailer     = crc_write_trailer,
  68.     .flags             = AVFMT_NOTIMESTAMPS,
  69. };
  70.