2 * CRC encoder (for codec/format testing)
3 * Copyright (c) 2002 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
24 #include "libavutil/adler32.h"
27 typedef struct CRCState
{
31 static int crc_write_header(struct AVFormatContext
*s
)
33 CRCState
*crc
= s
->priv_data
;
41 static int crc_write_packet(struct AVFormatContext
*s
, AVPacket
*pkt
)
43 CRCState
*crc
= s
->priv_data
;
44 crc
->crcval
= av_adler32_update(crc
->crcval
, pkt
->data
, pkt
->size
);
48 static int crc_write_trailer(struct AVFormatContext
*s
)
50 CRCState
*crc
= s
->priv_data
;
53 snprintf(buf
, sizeof(buf
), "CRC=0x%08"PRIx32
"\n", crc
->crcval
);
54 avio_write(s
->pb
, buf
, strlen(buf
));
59 AVOutputFormat ff_crc_muxer
= {
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
,