1/*
2 * MD5 encoder (for codec/format testing)
3 * Copyright (c) 2009 Reimar D��ffinger, 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
29struct MD5Context {
30    const AVClass *avclass;
31    struct AVHashContext *hash;
32    char *hash_name;
33};
34
35static void md5_finish(struct AVFormatContext *s, char *buf)
36{
37    struct MD5Context *c = s->priv_data;
38    uint8_t md5[AV_HASH_MAX_SIZE];
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
56static 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
61static 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
69static 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
79static 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
86static 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
99AVOutputFormat 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
114static 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));
123    ff_framehash_write_header(s);
124    avio_printf(s->pb, "#stream#, dts,        pts, duration,     size, hash\n");
125    return 0;
126}
127
128static 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
141static 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
148static 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
155AVOutputFormat 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,
164    .flags             = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT |
165                         AVFMT_TS_NEGATIVE,
166    .priv_class        = &framemd5_class,
167};
168#endif
169