ref: 31d3f43e1891b514ce10be49807deea017cd2830
dir: /examples/decode_to_md5.c/
/*
* 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_config.h"
#include "vpx/vp8dx.h"
#include "vpx/vpx_decoder.h"
#define interface (vpx_codec_vp8_dx())
#include "md5_utils.h"
#define IVF_FILE_HDR_SZ (32)
#define IVF_FRAME_HDR_SZ (12)
static unsigned int mem_get_le32(const unsigned char *mem) {
return (mem[3] << 24) | (mem[2] << 16) | (mem[1] << 8) | (mem[0]);
}
static void die(const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
vprintf(fmt, ap);
if(fmt[strlen(fmt)-1] != '\n')
printf("\n");
exit(EXIT_FAILURE);
}
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);
}
int main(int argc, char **argv) {
FILE *infile, *outfile;
vpx_codec_ctx_t codec;
int flags = 0, frame_cnt = 0;
unsigned char file_hdr[IVF_FILE_HDR_SZ];
unsigned char frame_hdr[IVF_FRAME_HDR_SZ];
unsigned char frame[256*1024];
vpx_codec_err_t res;
(void)res;
/* Open files */
if(argc!=3)
die("Usage: %s <infile> <outfile>\n", argv[0]);
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]);
/* Read file header */
if(!(fread(file_hdr, 1, IVF_FILE_HDR_SZ, infile) == IVF_FILE_HDR_SZ
&& file_hdr[0]=='D' && file_hdr[1]=='K' && file_hdr[2]=='I'
&& file_hdr[3]=='F'))
die("%s is not an IVF file.", argv[1]);
printf("Using %s\n",vpx_codec_iface_name(interface));
/* Initialize codec */
if(vpx_codec_dec_init(&codec, interface, NULL, flags))
die_codec(&codec, "Failed to initialize decoder");
/* Read each frame */
while(fread(frame_hdr, 1, IVF_FRAME_HDR_SZ, infile) == IVF_FRAME_HDR_SZ) {
int frame_sz = mem_get_le32(frame_hdr);
vpx_codec_iter_t iter = NULL;
vpx_image_t *img;
frame_cnt++;
if(frame_sz > sizeof(frame))
die("Frame %d data too big for example code buffer", frame_sz);
if(fread(frame, 1, frame_sz, infile) != frame_sz)
die("Frame %d failed to read complete frame", frame_cnt);
/* Decode the frame */
if(vpx_codec_decode(&codec, frame, frame_sz, NULL, 0))
die_codec(&codec, "Failed to decode frame");
/* Write decoded data to disk */
while((img = vpx_codec_get_frame(&codec, &iter))) {
unsigned int plane, y;
unsigned char md5_sum[16];
MD5Context md5;
int i;
MD5Init(&md5);
for(plane=0; plane < 3; plane++) {
unsigned char *buf =img->planes[plane];
for (y=0; y < (plane ? (img->d_h + 1) >> 1 : img->d_h); y++) {
MD5Update(&md5, buf, (plane ? (img->d_w + 1) >> 1 : img->d_w));
buf += img->stride[plane];
}
}
MD5Final(md5_sum, &md5);
for (i = 0; i < 16; i++)
fprintf(outfile, "%02x",md5_sum[i]);
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");
fclose(outfile);
fclose(infile);
return EXIT_SUCCESS;
}