md5enc.c
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1 /*
2  * MD5 encoder (for codec/format testing)
3  * Copyright (c) 2009 Reimar Döffinger, based on crcenc (c) 2002 Fabrice Bellard
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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/md5.h"
23 #include "avformat.h"
24 
25 #define PRIVSIZE 512
26 
27 static void md5_finish(struct AVFormatContext *s, char *buf)
28 {
29  uint8_t md5[16];
30  int i, offset = strlen(buf);
31  av_md5_final(s->priv_data, md5);
32  for (i = 0; i < sizeof(md5); i++) {
33  snprintf(buf + offset, 3, "%02"PRIx8, md5[i]);
34  offset += 2;
35  }
36  buf[offset] = '\n';
37  buf[offset+1] = 0;
38 
39  avio_write(s->pb, buf, strlen(buf));
40  avio_flush(s->pb);
41 }
42 
43 #if CONFIG_MD5_MUXER
44 static int write_header(struct AVFormatContext *s)
45 {
46  if (PRIVSIZE < av_md5_size) {
47  av_log(s, AV_LOG_ERROR, "Insuffient size for md5 context\n");
48  return -1;
49  }
51  return 0;
52 }
53 
54 static int write_packet(struct AVFormatContext *s, AVPacket *pkt)
55 {
56  av_md5_update(s->priv_data, pkt->data, pkt->size);
57  return 0;
58 }
59 
60 static int write_trailer(struct AVFormatContext *s)
61 {
62  char buf[64] = "MD5=";
63 
64  md5_finish(s, buf);
65  return 0;
66 }
67 
68 AVOutputFormat ff_md5_muxer = {
69  .name = "md5",
70  .long_name = NULL_IF_CONFIG_SMALL("MD5 testing format"),
71  .extensions = "",
72  .priv_data_size = PRIVSIZE,
73  .audio_codec = CODEC_ID_PCM_S16LE,
74  .video_codec = CODEC_ID_RAWVIDEO,
75  .write_header = write_header,
76  .write_packet = write_packet,
77  .write_trailer = write_trailer,
78  .flags = AVFMT_NOTIMESTAMPS,
79 };
80 #endif
81 
82 #if CONFIG_FRAMEMD5_MUXER
83 static int framemd5_write_packet(struct AVFormatContext *s, AVPacket *pkt)
84 {
85  char buf[256];
86  if (PRIVSIZE < av_md5_size) {
87  av_log(s, AV_LOG_ERROR, "Insuffient size for md5 context\n");
88  return -1;
89  }
91  av_md5_update(s->priv_data, pkt->data, pkt->size);
92 
93  snprintf(buf, sizeof(buf) - 64, "%d, %"PRId64", %d, ", pkt->stream_index, pkt->dts, pkt->size);
94  md5_finish(s, buf);
95  return 0;
96 }
97 
98 AVOutputFormat ff_framemd5_muxer = {
99  .name = "framemd5",
100  .long_name = NULL_IF_CONFIG_SMALL("Per-frame MD5 testing format"),
101  .extensions = "",
102  .priv_data_size = PRIVSIZE,
103  .audio_codec = CODEC_ID_PCM_S16LE,
104  .video_codec = CODEC_ID_RAWVIDEO,
105  .write_packet = framemd5_write_packet,
106  .flags = AVFMT_VARIABLE_FPS,
107 };
108 #endif