1 /*
2 * Copyright (c) 2016, Alliance for Open Media. All rights reserved
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11
12 // Frame-by-frame MD5 Checksum
13 // ===========================
14 //
15 // This example builds upon the simple decoder loop to show how checksums
16 // of the decoded output can be generated. These are used for validating
17 // decoder implementations against the reference implementation, for example.
18 //
19 // MD5 algorithm
20 // -------------
21 // The Message-Digest 5 (MD5) is a well known hash function. We have provided
22 // an implementation derived from the RSA Data Security, Inc. MD5 Message-Digest
23 // Algorithm for your use. Our implmentation only changes the interface of this
24 // reference code. You must include the `md5_utils.h` header for access to these
25 // functions.
26 //
27 // Processing The Decoded Data
28 // ---------------------------
29 // Each row of the image is passed to the MD5 accumulator. First the Y plane
30 // is processed, then U, then V. It is important to honor the image's `stride`
31 // values.
32
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36
37 #include "aom/aom_decoder.h"
38 #include "aom/aomdx.h"
39 #include "common/md5_utils.h"
40 #include "common/tools_common.h"
41 #include "common/video_reader.h"
42
get_image_md5(const aom_image_t * img,unsigned char digest[16])43 static void get_image_md5(const aom_image_t *img, unsigned char digest[16]) {
44 int plane, y;
45 MD5Context md5;
46
47 MD5Init(&md5);
48
49 for (plane = 0; plane < 3; ++plane) {
50 const unsigned char *buf = img->planes[plane];
51 const int stride = img->stride[plane];
52 const int w = plane ? (img->d_w + 1) >> 1 : img->d_w;
53 const int h = plane ? (img->d_h + 1) >> 1 : img->d_h;
54
55 for (y = 0; y < h; ++y) {
56 MD5Update(&md5, buf, w);
57 buf += stride;
58 }
59 }
60
61 MD5Final(digest, &md5);
62 }
63
print_md5(FILE * stream,unsigned char digest[16])64 static void print_md5(FILE *stream, unsigned char digest[16]) {
65 int i;
66
67 for (i = 0; i < 16; ++i) fprintf(stream, "%02x", digest[i]);
68 }
69
70 static const char *exec_name;
71
usage_exit(void)72 void usage_exit(void) {
73 fprintf(stderr, "Usage: %s <infile> <outfile>\n", exec_name);
74 exit(EXIT_FAILURE);
75 }
76
main(int argc,char ** argv)77 int main(int argc, char **argv) {
78 int frame_cnt = 0;
79 FILE *outfile = NULL;
80 aom_codec_ctx_t codec;
81 AvxVideoReader *reader = NULL;
82 const AvxVideoInfo *info = NULL;
83 const AvxInterface *decoder = NULL;
84
85 exec_name = argv[0];
86
87 if (argc != 3) die("Invalid number of arguments.");
88
89 reader = aom_video_reader_open(argv[1]);
90 if (!reader) die("Failed to open %s for reading.", argv[1]);
91
92 if (!(outfile = fopen(argv[2], "wb")))
93 die("Failed to open %s for writing.", argv[2]);
94
95 info = aom_video_reader_get_info(reader);
96
97 decoder = get_aom_decoder_by_fourcc(info->codec_fourcc);
98 if (!decoder) die("Unknown input codec.");
99
100 printf("Using %s\n", aom_codec_iface_name(decoder->codec_interface()));
101
102 if (aom_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0))
103 die_codec(&codec, "Failed to initialize decoder");
104
105 while (aom_video_reader_read_frame(reader)) {
106 aom_codec_iter_t iter = NULL;
107 aom_image_t *img = NULL;
108 size_t frame_size = 0;
109 const unsigned char *frame =
110 aom_video_reader_get_frame(reader, &frame_size);
111 if (aom_codec_decode(&codec, frame, frame_size, NULL))
112 die_codec(&codec, "Failed to decode frame");
113
114 while ((img = aom_codec_get_frame(&codec, &iter)) != NULL) {
115 unsigned char digest[16];
116
117 get_image_md5(img, digest);
118 print_md5(outfile, digest);
119 fprintf(outfile, " img-%dx%d-%04d.i420\n", img->d_w, img->d_h,
120 ++frame_cnt);
121 }
122 }
123
124 printf("Processed %d frames.\n", frame_cnt);
125 if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
126
127 aom_video_reader_close(reader);
128
129 fclose(outfile);
130 return EXIT_SUCCESS;
131 }
132