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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 "libavutil/adler32.h"
  23. #include "avformat.h"
  24.  
  25. typedef struct CRCState {
  26.     uint32_t crcval;
  27. } CRCState;
  28.  
  29. static int crc_write_header(struct AVFormatContext *s)
  30. {
  31.     CRCState *crc = s->priv_data;
  32.  
  33.     /* init CRC */
  34.     crc->crcval = 1;
  35.  
  36.     return 0;
  37. }
  38.  
  39. static int crc_write_packet(struct AVFormatContext *s, AVPacket *pkt)
  40. {
  41.     CRCState *crc = s->priv_data;
  42.     crc->crcval = av_adler32_update(crc->crcval, pkt->data, pkt->size);
  43.     return 0;
  44. }
  45.  
  46. static int crc_write_trailer(struct AVFormatContext *s)
  47. {
  48.     CRCState *crc = s->priv_data;
  49.     char buf[64];
  50.  
  51.     snprintf(buf, sizeof(buf), "CRC=0x%08x\n", crc->crcval);
  52.     avio_write(s->pb, buf, strlen(buf));
  53.  
  54.     return 0;
  55. }
  56.  
  57. AVOutputFormat ff_crc_muxer = {
  58.     .name              = "crc",
  59.     .long_name         = NULL_IF_CONFIG_SMALL("CRC testing"),
  60.     .priv_data_size    = sizeof(CRCState),
  61.     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
  62.     .video_codec       = AV_CODEC_ID_RAWVIDEO,
  63.     .write_header      = crc_write_header,
  64.     .write_packet      = crc_write_packet,
  65.     .write_trailer     = crc_write_trailer,
  66.     .flags             = AVFMT_NOTIMESTAMPS,
  67. };
  68.