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* Copyright (c) 2016, Alliance for Open Media. All rights reserved
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at
// Frame-by-frame MD5 Checksum
// ===========================
// This example builds upon the simple decoder loop to show how checksums
// of the decoded output can be generated. These are used for validating
// decoder implementations against the reference implementation, for example.
// MD5 algorithm
// -------------
// The Message-Digest 5 (MD5) is a well known hash function. We have provided
// an implementation derived from the RSA Data Security, Inc. MD5 Message-Digest
// Algorithm for your use. Our implmentation only changes the interface of this
// reference code. You must include the `md5_utils.h` header for access to these
// functions.
// Processing The Decoded Data
// ---------------------------
// Each row of the image is passed to the MD5 accumulator. First the Y plane
// is processed, then U, then V. It is important to honor the image's `stride`
// values.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "aom/aom_decoder.h"
#include "aom/aomdx.h"
#include "common/md5_utils.h"
#include "common/tools_common.h"
#include "common/video_reader.h"
static void get_image_md5(const aom_image_t *img, unsigned char digest[16]) {
int plane, y;
MD5Context md5;
for (plane = 0; plane < 3; ++plane) {
const unsigned char *buf = img->planes[plane];
const int stride = img->stride[plane];
const int w = plane ? (img->d_w + 1) >> 1 : img->d_w;
const int h = plane ? (img->d_h + 1) >> 1 : img->d_h;
for (y = 0; y < h; ++y) {
MD5Update(&md5, buf, w);
buf += stride;
MD5Final(digest, &md5);
static void print_md5(FILE *stream, unsigned char digest[16]) {
int i;
for (i = 0; i < 16; ++i) fprintf(stream, "%02x", digest[i]);
static const char *exec_name;
void usage_exit(void) {
fprintf(stderr, "Usage: %s <infile> <outfile>\n", exec_name);
int main(int argc, char **argv) {
int frame_cnt = 0;
FILE *outfile = NULL;
AvxVideoReader *reader = NULL;
const AvxVideoInfo *info = NULL;
exec_name = argv[0];
if (argc != 3) die("Invalid number of arguments.");
reader = aom_video_reader_open(argv[1]);
if (!reader) die("Failed to open %s for reading.", argv[1]);
if (!(outfile = fopen(argv[2], "wb")))
die("Failed to open %s for writing.", argv[2]);
info = aom_video_reader_get_info(reader);
aom_codec_iface_t *decoder = get_aom_decoder_by_fourcc(info->codec_fourcc);
if (!decoder) die("Unknown input codec.");
printf("Using %s\n", aom_codec_iface_name(decoder));
aom_codec_ctx_t codec;
if (aom_codec_dec_init(&codec, decoder, NULL, 0))
die("Failed to initialize decoder");
while (aom_video_reader_read_frame(reader)) {
aom_codec_iter_t iter = NULL;
aom_image_t *img = NULL;
size_t frame_size = 0;
const unsigned char *frame =
aom_video_reader_get_frame(reader, &frame_size);
if (aom_codec_decode(&codec, frame, frame_size, NULL))
die_codec(&codec, "Failed to decode frame");
while ((img = aom_codec_get_frame(&codec, &iter)) != NULL) {
unsigned char digest[16];
get_image_md5(img, digest);
print_md5(outfile, digest);
fprintf(outfile, " img-%ux%u-%04d.i420\n", img->d_w, img->d_h,
printf("Processed %d frames.\n", frame_cnt);
if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");