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/libavformat/crcenc.c

http://github.com/FFmpeg/FFmpeg
C | 69 lines | 37 code | 11 blank | 21 comment | 0 complexity | a751bc5c89f925678006cd52c327db7f MD5 | raw file
 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
27typedef struct CRCState {
28    uint32_t crcval;
29} CRCState;
30
31static 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
41static 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
48static 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
59AVOutputFormat 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};