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
25typedef struct CRCState {
26    uint32_t crcval;
27} CRCState;
28
29static 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
39static 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
46static 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    put_buffer(s->pb, buf, strlen(buf));
53    put_flush_packet(s->pb);
54    return 0;
55}
56
57AVOutputFormat crc_muxer = {
58    "crc",
59    NULL_IF_CONFIG_SMALL("CRC testing format"),
60    NULL,
61    "",
62    sizeof(CRCState),
63    CODEC_ID_PCM_S16LE,
64    CODEC_ID_RAWVIDEO,
65    crc_write_header,
66    crc_write_packet,
67    crc_write_trailer,
68};
69