FFmpeg  2.1.1
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 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/avassert.h"
23 #include "libavutil/avstring.h"
24 #include "libavutil/hash.h"
25 #include "libavutil/opt.h"
26 #include "avformat.h"
27 #include "internal.h"
28 
29 struct MD5Context {
30  const AVClass *avclass;
32  char *hash_name;
33 };
34 
35 static void md5_finish(struct AVFormatContext *s, char *buf)
36 {
37  struct MD5Context *c = s->priv_data;
39  int i, offset = strlen(buf);
40  int len = av_hash_get_size(c->hash);
41  av_assert0(len > 0 && len <= sizeof(md5));
42  av_hash_final(c->hash, md5);
43  for (i = 0; i < len; i++) {
44  snprintf(buf + offset, 3, "%02"PRIx8, md5[i]);
45  offset += 2;
46  }
47  buf[offset] = '\n';
48  buf[offset+1] = 0;
49 
50  avio_write(s->pb, buf, strlen(buf));
51  avio_flush(s->pb);
52 }
53 
54 #define OFFSET(x) offsetof(struct MD5Context, x)
55 #define ENC AV_OPT_FLAG_ENCODING_PARAM
56 static const AVOption hash_options[] = {
57  { "hash", "set hash to use", OFFSET(hash_name), AV_OPT_TYPE_STRING, {.str = "md5"}, 0, 0, ENC },
58  { NULL },
59 };
60 
61 static const AVClass md5enc_class = {
62  .class_name = "hash encoder class",
63  .item_name = av_default_item_name,
64  .option = hash_options,
65  .version = LIBAVUTIL_VERSION_INT,
66 };
67 
68 #if CONFIG_MD5_MUXER
69 static int write_header(struct AVFormatContext *s)
70 {
71  struct MD5Context *c = s->priv_data;
72  int res = av_hash_alloc(&c->hash, c->hash_name);
73  if (res < 0)
74  return res;
75  av_hash_init(c->hash);
76  return 0;
77 }
78 
79 static int write_packet(struct AVFormatContext *s, AVPacket *pkt)
80 {
81  struct MD5Context *c = s->priv_data;
82  av_hash_update(c->hash, pkt->data, pkt->size);
83  return 0;
84 }
85 
86 static int write_trailer(struct AVFormatContext *s)
87 {
88  struct MD5Context *c = s->priv_data;
89  char buf[256];
90  av_strlcpy(buf, av_hash_get_name(c->hash), sizeof(buf) - 200);
91  av_strlcat(buf, "=", sizeof(buf) - 200);
92 
93  md5_finish(s, buf);
94 
95  av_hash_freep(&c->hash);
96  return 0;
97 }
98 
99 AVOutputFormat ff_md5_muxer = {
100  .name = "md5",
101  .long_name = NULL_IF_CONFIG_SMALL("MD5 testing"),
102  .priv_data_size = sizeof(struct MD5Context),
103  .audio_codec = AV_CODEC_ID_PCM_S16LE,
104  .video_codec = AV_CODEC_ID_RAWVIDEO,
105  .write_header = write_header,
106  .write_packet = write_packet,
107  .write_trailer = write_trailer,
108  .flags = AVFMT_NOTIMESTAMPS,
109  .priv_class = &md5enc_class,
110 };
111 #endif
112 
113 #if CONFIG_FRAMEMD5_MUXER
114 static int framemd5_write_header(struct AVFormatContext *s)
115 {
116  struct MD5Context *c = s->priv_data;
117  int res = av_hash_alloc(&c->hash, c->hash_name);
118  if (res < 0)
119  return res;
120  avio_printf(s->pb, "#format: frame checksums\n");
121  avio_printf(s->pb, "#version: 1\n");
122  avio_printf(s->pb, "#hash: %s\n", av_hash_get_name(c->hash));
124  avio_printf(s->pb, "#stream#, dts, pts, duration, size, hash\n");
125  return 0;
126 }
127 
128 static int framemd5_write_packet(struct AVFormatContext *s, AVPacket *pkt)
129 {
130  struct MD5Context *c = s->priv_data;
131  char buf[256];
132  av_hash_init(c->hash);
133  av_hash_update(c->hash, pkt->data, pkt->size);
134 
135  snprintf(buf, sizeof(buf) - 64, "%d, %10"PRId64", %10"PRId64", %8d, %8d, ",
136  pkt->stream_index, pkt->dts, pkt->pts, pkt->duration, pkt->size);
137  md5_finish(s, buf);
138  return 0;
139 }
140 
141 static int framemd5_write_trailer(struct AVFormatContext *s)
142 {
143  struct MD5Context *c = s->priv_data;
144  av_hash_freep(&c->hash);
145  return 0;
146 }
147 
148 static const AVClass framemd5_class = {
149  .class_name = "frame hash encoder class",
150  .item_name = av_default_item_name,
151  .option = hash_options,
152  .version = LIBAVUTIL_VERSION_INT,
153 };
154 
155 AVOutputFormat ff_framemd5_muxer = {
156  .name = "framemd5",
157  .long_name = NULL_IF_CONFIG_SMALL("Per-frame MD5 testing"),
158  .priv_data_size = sizeof(struct MD5Context),
159  .audio_codec = AV_CODEC_ID_PCM_S16LE,
160  .video_codec = AV_CODEC_ID_RAWVIDEO,
161  .write_header = framemd5_write_header,
162  .write_packet = framemd5_write_packet,
163  .write_trailer = framemd5_write_trailer,
166  .priv_class = &framemd5_class,
167 };
168 #endif
struct AVMD5 * md5
Definition: md5proto.c:31
const char * s
Definition: avisynth_c.h:668
AVOption.
Definition: opt.h:253
#define AVFMT_TS_NONSTRICT
Format does not require strictly increasing timestamps, but they must still be monotonic.
Definition: avformat.h:365
static const AVClass md5enc_class
Definition: md5enc.c:61
#define LIBAVUTIL_VERSION_INT
Definition: avcodec.h:820
int size
Definition: avcodec.h:1064
void avio_write(AVIOContext *s, const unsigned char *buf, int size)
Definition: aviobuf.c:173
int void avio_flush(AVIOContext *s)
Force flushing of buffered data to the output s.
Definition: aviobuf.c:193
const AVClass * avclass
Definition: md5enc.c:30
Format I/O context.
Definition: avformat.h:968
#define AVFMT_NOTIMESTAMPS
Format does not need / have any timestamps.
Definition: avformat.h:354
static uint8_t * res
Definition: ffhash.c:43
const char * av_default_item_name(void *ctx)
Return the context name.
Definition: log.c:145
uint8_t
#define AV_HASH_MAX_SIZE
Maximum value that av_hash_get_size will currently return.
Definition: hash.h:61
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:55
static const uint8_t offset[511][2]
Definition: vf_uspp.c:58
void av_hash_init(AVHashContext *ctx)
Initialize or reset a hash context.
Definition: hash.c:136
char * hash_name
Definition: md5enc.c:32
int duration
Duration of this packet in AVStream-&gt;time_base units, 0 if unknown.
Definition: avcodec.h:1085
int avio_printf(AVIOContext *s, const char *fmt,...) av_printf_format(2
static const AVOption hash_options[]
Definition: md5enc.c:56
void * priv_data
Format private data.
Definition: avformat.h:988
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:151
size_t av_strlcpy(char *dst, const char *src, size_t size)
Copy the string src to dst, but no more than size - 1 bytes, and null-terminate dst.
Definition: avstring.c:82
int av_hash_alloc(AVHashContext **ctx, const char *name)
Allocate a hash context for the algorithm specified by name.
Definition: hash.c:99
static int write_trailer(AVFormatContext *s1)
Definition: v4l2enc.c:93
#define AVFMT_VARIABLE_FPS
Format allows variable fps.
Definition: avformat.h:357
const char * av_hash_get_name(const AVHashContext *ctx)
Definition: hash.c:89
#define AVFMT_TS_NEGATIVE
Format allows muxing negative timestamps.
Definition: avformat.h:372
const char * name
Definition: avformat.h:395
void av_hash_freep(AVHashContext **ctx)
Free hash context.
Definition: hash.c:199
int ff_framehash_write_header(AVFormatContext *s)
Set the timebase for each stream from the corresponding codec timebase and print it.
Definition: framehash.c:23
void av_hash_final(AVHashContext *ctx, uint8_t *dst)
Finalize a hash context and compute the actual hash value.
Definition: hash.c:178
int av_hash_get_size(const AVHashContext *ctx)
Definition: hash.c:94
AVIOContext * pb
I/O context.
Definition: avformat.h:1001
void * buf
Definition: avisynth_c.h:594
void av_hash_update(AVHashContext *ctx, const uint8_t *src, int len)
Update a hash context with additional data.
Definition: hash.c:157
Describe the class of an AVClass context structure.
Definition: log.h:50
uint8_t * data
Definition: avcodec.h:1063
#define ENC
Definition: md5enc.c:55
#define snprintf
Definition: snprintf.h:34
size_t av_strlcat(char *dst, const char *src, size_t size)
Append the string src to the string dst, but to a total length of no more than size - 1 bytes...
Definition: avstring.c:92
static double c[64]
Main libavformat public API header.
static void md5_finish(struct AVFormatContext *s, char *buf)
Definition: md5enc.c:35
struct AVHashContext * hash
Definition: md5enc.c:31
#define OFFSET(x)
Definition: md5enc.c:54
int len
static void write_header(FFV1Context *f)
Definition: ffv1enc.c:492
int64_t dts
Decompression timestamp in AVStream-&gt;time_base units; the time at which the packet is decompressed...
Definition: avcodec.h:1062
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
static AVPacket pkt
Definition: demuxing.c:52
int stream_index
Definition: avcodec.h:1065
This structure stores compressed data.
Definition: avcodec.h:1040
static int write_packet(AVFormatContext *s1, AVPacket *pkt)
Definition: v4l2enc.c:85
int64_t pts
Presentation timestamp in AVStream-&gt;time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1056