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
crc_write_header(struct AVFormatContext * s)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
crc_write_packet(struct AVFormatContext * s,AVPacket * pkt)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
crc_write_trailer(struct AVFormatContext * s)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