1 /*
2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11 // Frame-by-frame MD5 Checksum
12 // ===========================
13 //
14 // This example builds upon the simple decoder loop to show how checksums
15 // of the decoded output can be generated. These are used for validating
16 // decoder implementations against the reference implementation, for example.
17 //
18 // MD5 algorithm
19 // -------------
20 // The Message-Digest 5 (MD5) is a well known hash function. We have provided
21 // an implementation derived from the RSA Data Security, Inc. MD5 Message-Digest
22 // Algorithm for your use. Our implmentation only changes the interface of this
23 // reference code. You must include the `md5_utils.h` header for access to these
24 // functions.
25 //
26 // Processing The Decoded Data
27 // ---------------------------
28 // Each row of the image is passed to the MD5 accumulator. First the Y plane
29 // is processed, then U, then V. It is important to honor the image's `stride`
30 // values.
31
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35
36 #define VPX_CODEC_DISABLE_COMPAT 1
37
38 #include "vpx/vp8dx.h"
39 #include "vpx/vpx_decoder.h"
40
41 #include "./md5_utils.h"
42 #include "./tools_common.h"
43 #include "./video_reader.h"
44 #include "./vpx_config.h"
45
get_image_md5(const vpx_image_t * img,unsigned char digest[16])46 static void get_image_md5(const vpx_image_t *img, unsigned char digest[16]) {
47 int plane, y;
48 MD5Context md5;
49
50 MD5Init(&md5);
51
52 for (plane = 0; plane < 3; ++plane) {
53 const unsigned char *buf = img->planes[plane];
54 const int stride = img->stride[plane];
55 const int w = plane ? (img->d_w + 1) >> 1 : img->d_w;
56 const int h = plane ? (img->d_h + 1) >> 1 : img->d_h;
57
58 for (y = 0; y < h; ++y) {
59 MD5Update(&md5, buf, w);
60 buf += stride;
61 }
62 }
63
64 MD5Final(digest, &md5);
65 }
66
print_md5(FILE * stream,unsigned char digest[16])67 static void print_md5(FILE *stream, unsigned char digest[16]) {
68 int i;
69
70 for (i = 0; i < 16; ++i)
71 fprintf(stream, "%02x", digest[i]);
72 }
73
74 static const char *exec_name;
75
usage_exit()76 void usage_exit() {
77 fprintf(stderr, "Usage: %s <infile> <outfile>\n", exec_name);
78 exit(EXIT_FAILURE);
79 }
80
main(int argc,char ** argv)81 int main(int argc, char **argv) {
82 int frame_cnt = 0;
83 FILE *outfile = NULL;
84 vpx_codec_ctx_t codec;
85 VpxVideoReader *reader = NULL;
86 const VpxVideoInfo *info = NULL;
87 const VpxInterface *decoder = NULL;
88
89 exec_name = argv[0];
90
91 if (argc != 3)
92 die("Invalid number of arguments.");
93
94 reader = vpx_video_reader_open(argv[1]);
95 if (!reader)
96 die("Failed to open %s for reading.", argv[1]);
97
98 if (!(outfile = fopen(argv[2], "wb")))
99 die("Failed to open %s for writing.", argv[2]);
100
101 info = vpx_video_reader_get_info(reader);
102
103 decoder = get_vpx_decoder_by_fourcc(info->codec_fourcc);
104 if (!decoder)
105 die("Unknown input codec.");
106
107 printf("Using %s\n", vpx_codec_iface_name(decoder->interface()));
108
109 if (vpx_codec_dec_init(&codec, decoder->interface(), NULL, 0))
110 die_codec(&codec, "Failed to initialize decoder");
111
112 while (vpx_video_reader_read_frame(reader)) {
113 vpx_codec_iter_t iter = NULL;
114 vpx_image_t *img = NULL;
115 size_t frame_size = 0;
116 const unsigned char *frame = vpx_video_reader_get_frame(reader,
117 &frame_size);
118 if (vpx_codec_decode(&codec, frame, (unsigned int)frame_size, NULL, 0))
119 die_codec(&codec, "Failed to decode frame");
120
121 while ((img = vpx_codec_get_frame(&codec, &iter)) != NULL) {
122 unsigned char digest[16];
123
124 get_image_md5(img, digest);
125 print_md5(outfile, digest);
126 fprintf(outfile, " img-%dx%d-%04d.i420\n",
127 img->d_w, img->d_h, ++frame_cnt);
128 }
129 }
130
131 printf("Processed %d frames.\n", frame_cnt);
132 if (vpx_codec_destroy(&codec))
133 die_codec(&codec, "Failed to destroy codec.");
134
135 vpx_video_reader_close(reader);
136
137 fclose(outfile);
138 return EXIT_SUCCESS;
139 }
140