libvpx: Pull from upstream

source/libvpx/examples/decode_to_md5.c

Index: source/libvpx/examples/decode_to_md5.c
===================================================================
--- source/libvpx/examples/decode_to_md5.c	(revision 0)
+++ source/libvpx/examples/decode_to_md5.c	(revision 0)
@@ -0,0 +1,139 @@
+/*
+ *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// 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>
+
+#define VPX_CODEC_DISABLE_COMPAT 1
+
+#include "vpx/vp8dx.h"
+#include "vpx/vpx_decoder.h"
+
+#include "./ivfdec.h"
+#include "./md5_utils.h"
+#include "./tools_common.h"
+#include "./vpx_config.h"
+
+static void get_image_md5(const vpx_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() {
+  fprintf(stderr, "Usage: %s <infile> <outfile>\n", exec_name);
+  exit(EXIT_FAILURE);
+}
+
+int main(int argc, char **argv) {
+  FILE *infile, *outfile;
+  vpx_codec_ctx_t codec;
+  vpx_codec_iface_t *iface;
+  int flags = 0, frame_cnt = 0;
+  vpx_video_t *video;
+
+  exec_name = argv[0];
+
+  if (argc != 3)
+    die("Invalid number of arguments");
+
+  if (!(infile = fopen(argv[1], "rb")))
+    die("Failed to open %s for reading", argv[1]);
+
+  if (!(outfile = fopen(argv[2], "wb")))
+    die("Failed to open %s for writing", argv[2]);
+
+  video = vpx_video_open_file(infile);
+  if (!video)
+    die("%s is not an IVF file.", argv[1]);
+
+  iface = get_codec_interface(vpx_video_get_fourcc(video));
+  if (!iface)
+    die("Unknown FOURCC code.");
+
+  printf("Using %s\n", vpx_codec_iface_name(iface));
+
+  if (vpx_codec_dec_init(&codec, iface, NULL, flags))
+    die_codec(&codec, "Failed to initialize decoder");
+
+  while (vpx_video_read_frame(video)) {
+    vpx_codec_iter_t iter = NULL;
+    vpx_image_t *img = NULL;
+    size_t frame_size = 0;
+    const unsigned char *frame = vpx_video_get_frame(video, &frame_size);
+    if (vpx_codec_decode(&codec, frame, frame_size, NULL, 0))
+      die_codec(&codec, "Failed to decode frame");
+
+    while ((img = vpx_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 (vpx_codec_destroy(&codec))
+    die_codec(&codec, "Failed to destroy codec");
+
+  vpx_video_close(video);
+
+  fclose(outfile);
+  fclose(infile);
+  return EXIT_SUCCESS;
+}