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/*
* 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 <stdarg.h>
#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"
#define VP8_FOURCC 0x30385056
#define VP9_FOURCC 0x30395056
static vpx_codec_iface_t *get_codec_interface(unsigned int fourcc) {
switch (fourcc) {
case VP8_FOURCC:
return vpx_codec_vp8_dx();
case VP9_FOURCC:
return vpx_codec_vp9_dx();
}
return NULL;
}
static void die_codec(vpx_codec_ctx_t *ctx, const char *s) {
const char *detail = vpx_codec_error_detail(ctx);
printf("%s: %s\n", s, vpx_codec_error(ctx));
if(detail)
printf(" %s\n",detail);
exit(EXIT_FAILURE);
}
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;
}
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