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 46static 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 67static 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 74static const char *exec_name; 75 76void usage_exit() { 77 fprintf(stderr, "Usage: %s <infile> <outfile>\n", exec_name); 78 exit(EXIT_FAILURE); 79} 80 81int 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