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#include "vpx/vp8dx.h" 37#include "vpx/vpx_decoder.h" 38 39#include "./md5_utils.h" 40#include "./tools_common.h" 41#include "./video_reader.h" 42#include "./vpx_config.h" 43 44static void get_image_md5(const vpx_image_t *img, unsigned char digest[16]) { 45 int plane, y; 46 MD5Context md5; 47 48 MD5Init(&md5); 49 50 for (plane = 0; plane < 3; ++plane) { 51 const unsigned char *buf = img->planes[plane]; 52 const int stride = img->stride[plane]; 53 const int w = plane ? (img->d_w + 1) >> 1 : img->d_w; 54 const int h = plane ? (img->d_h + 1) >> 1 : img->d_h; 55 56 for (y = 0; y < h; ++y) { 57 MD5Update(&md5, buf, w); 58 buf += stride; 59 } 60 } 61 62 MD5Final(digest, &md5); 63} 64 65static void print_md5(FILE *stream, unsigned char digest[16]) { 66 int i; 67 68 for (i = 0; i < 16; ++i) 69 fprintf(stream, "%02x", digest[i]); 70} 71 72static const char *exec_name; 73 74void usage_exit() { 75 fprintf(stderr, "Usage: %s <infile> <outfile>\n", exec_name); 76 exit(EXIT_FAILURE); 77} 78 79int main(int argc, char **argv) { 80 int frame_cnt = 0; 81 FILE *outfile = NULL; 82 vpx_codec_ctx_t codec; 83 VpxVideoReader *reader = NULL; 84 const VpxVideoInfo *info = NULL; 85 const VpxInterface *decoder = NULL; 86 87 exec_name = argv[0]; 88 89 if (argc != 3) 90 die("Invalid number of arguments."); 91 92 reader = vpx_video_reader_open(argv[1]); 93 if (!reader) 94 die("Failed to open %s for reading.", argv[1]); 95 96 if (!(outfile = fopen(argv[2], "wb"))) 97 die("Failed to open %s for writing.", argv[2]); 98 99 info = vpx_video_reader_get_info(reader); 100 101 decoder = get_vpx_decoder_by_fourcc(info->codec_fourcc); 102 if (!decoder) 103 die("Unknown input codec."); 104 105 printf("Using %s\n", vpx_codec_iface_name(decoder->codec_interface())); 106 107 if (vpx_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0)) 108 die_codec(&codec, "Failed to initialize decoder"); 109 110 while (vpx_video_reader_read_frame(reader)) { 111 vpx_codec_iter_t iter = NULL; 112 vpx_image_t *img = NULL; 113 size_t frame_size = 0; 114 const unsigned char *frame = vpx_video_reader_get_frame(reader, 115 &frame_size); 116 if (vpx_codec_decode(&codec, frame, (unsigned int)frame_size, NULL, 0)) 117 die_codec(&codec, "Failed to decode frame"); 118 119 while ((img = vpx_codec_get_frame(&codec, &iter)) != NULL) { 120 unsigned char digest[16]; 121 122 get_image_md5(img, digest); 123 print_md5(outfile, digest); 124 fprintf(outfile, " img-%dx%d-%04d.i420\n", 125 img->d_w, img->d_h, ++frame_cnt); 126 } 127 } 128 129 printf("Processed %d frames.\n", frame_cnt); 130 if (vpx_codec_destroy(&codec)) 131 die_codec(&codec, "Failed to destroy codec."); 132 133 vpx_video_reader_close(reader); 134 135 fclose(outfile); 136 return EXIT_SUCCESS; 137} 138