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2ba45a60 DM |
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 | ||
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 | ||
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 | ||
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 | }; |