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decode_to_md5.c 3.99 KiB
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/*
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 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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 *
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 *  Use of this source code is governed by a BSD-style license
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 *  that can be found in the LICENSE file in the root of the source
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 *  tree. An additional intellectual property rights grant can be found
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 *  in the file PATENTS.  All contributing project authors may
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 *  be found in the AUTHORS file in the root of the source tree.
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 */
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// Frame-by-frame MD5 Checksum
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// ===========================
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//
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// This example builds upon the simple decoder loop to show how checksums
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// of the decoded output can be generated. These are used for validating
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// decoder implementations against the reference implementation, for example.
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//
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// MD5 algorithm
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// -------------
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// The Message-Digest 5 (MD5) is a well known hash function. We have provided
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// an implementation derived from the RSA Data Security, Inc. MD5 Message-Digest
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// Algorithm for your use. Our implmentation only changes the interface of this
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// reference code. You must include the `md5_utils.h` header for access to these
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// functions.
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//
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// Processing The Decoded Data
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// ---------------------------
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// Each row of the image is passed to the MD5 accumulator. First the Y plane
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// is processed, then U, then V. It is important to honor the image's `stride`
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// values.
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define VPX_CODEC_DISABLE_COMPAT 1
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#include "vpx/vp8dx.h"
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#include "vpx/vpx_decoder.h"
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#include "./md5_utils.h"
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#include "./tools_common.h"
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#include "./video_reader.h"
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#include "./vpx_config.h"
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static void get_image_md5(const vpx_image_t *img, unsigned char digest[16]) {
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  int plane, y;
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  MD5Context md5;
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  MD5Init(&md5);
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  for (plane = 0; plane < 3; ++plane) {
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    const unsigned char *buf = img->planes[plane];
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    const int stride = img->stride[plane];
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    const int w = plane ? (img->d_w + 1) >> 1 : img->d_w;
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    const int h = plane ? (img->d_h + 1) >> 1 : img->d_h;
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    for (y = 0; y < h; ++y) {
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      MD5Update(&md5, buf, w);
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      buf += stride;
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    }
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  }
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  MD5Final(digest, &md5);
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}
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static void print_md5(FILE *stream, unsigned char digest[16]) {
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  int i;
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  for (i = 0; i < 16; ++i)
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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) { int frame_cnt = 0; FILE *outfile = NULL; vpx_codec_ctx_t codec; VpxVideoReader *reader = NULL; const VpxVideoInfo *info = NULL; const VpxInterface *decoder = NULL; exec_name = argv[0]; if (argc != 3) die("Invalid number of arguments."); reader = vpx_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 = vpx_video_reader_get_info(reader); decoder = get_vpx_decoder_by_fourcc(info->codec_fourcc); if (!decoder) die("Unknown input codec."); printf("Using %s\n", vpx_codec_iface_name(decoder->interface())); if (vpx_codec_dec_init(&codec, decoder->interface(), NULL, 0)) die_codec(&codec, "Failed to initialize decoder"); while (vpx_video_reader_read_frame(reader)) { vpx_codec_iter_t iter = NULL; vpx_image_t *img = NULL; size_t frame_size = 0; const unsigned char *frame = vpx_video_reader_get_frame(reader, &frame_size); if (vpx_codec_decode(&codec, frame, (unsigned int)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_reader_close(reader); fclose(outfile); return EXIT_SUCCESS; }