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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 www.aomedia.org/license/software. 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 www.aomedia.org/license/patent.
+ */
+
+// 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;
+
+ MD5Init(&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);
+ exit(EXIT_FAILURE);
+}
+
+int main(int argc, char **argv) {
+ int frame_cnt = 0;
+ FILE *outfile = NULL;
+ aom_codec_ctx_t codec;
+ AvxVideoReader *reader = NULL;
+ const AvxVideoInfo *info = NULL;
+ const AvxInterface *decoder = 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);
+
+ decoder = get_aom_decoder_by_fourcc(info->codec_fourcc);
+ if (!decoder) die("Unknown input codec.");
+
+ printf("Using %s\n", aom_codec_iface_name(decoder->codec_interface()));
+
+ if (aom_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0))
+ die_codec(&codec, "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-%dx%d-%04d.i420\n", img->d_w, img->d_h,
+ ++frame_cnt);
+ }
+ }
+
+ printf("Processed %d frames.\n", frame_cnt);
+ if (aom_codec_destroy(&codec)) die_codec(&codec, "Failed to destroy codec.");
+
+ aom_video_reader_close(reader);
+
+ fclose(outfile);
+ return EXIT_SUCCESS;
+}