9e96bdc733
The current file's directory, ".", is treated much more literally when building libvpx examples with Xcode than it is with make, and clang cannot find common include files included via "./" when those files actually reside one directory up in the tree. Change-Id: I5f66a026282e35d80248ca4052ebb882b859172e
138 lines
4.0 KiB
C
138 lines
4.0 KiB
C
/*
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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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#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]);
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}
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static const char *exec_name;
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void usage_exit() {
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fprintf(stderr, "Usage: %s <infile> <outfile>\n", exec_name);
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exit(EXIT_FAILURE);
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}
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int main(int argc, char **argv) {
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int frame_cnt = 0;
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FILE *outfile = NULL;
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vpx_codec_ctx_t codec;
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VpxVideoReader *reader = NULL;
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const VpxVideoInfo *info = NULL;
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const VpxInterface *decoder = NULL;
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exec_name = argv[0];
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if (argc != 3)
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die("Invalid number of arguments.");
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reader = vpx_video_reader_open(argv[1]);
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if (!reader)
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die("Failed to open %s for reading.", argv[1]);
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if (!(outfile = fopen(argv[2], "wb")))
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die("Failed to open %s for writing.", argv[2]);
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info = vpx_video_reader_get_info(reader);
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decoder = get_vpx_decoder_by_fourcc(info->codec_fourcc);
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if (!decoder)
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die("Unknown input codec.");
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printf("Using %s\n", vpx_codec_iface_name(decoder->codec_interface()));
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if (vpx_codec_dec_init(&codec, decoder->codec_interface(), NULL, 0))
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die_codec(&codec, "Failed to initialize decoder");
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while (vpx_video_reader_read_frame(reader)) {
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vpx_codec_iter_t iter = NULL;
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vpx_image_t *img = NULL;
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size_t frame_size = 0;
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const unsigned char *frame = vpx_video_reader_get_frame(reader,
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&frame_size);
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if (vpx_codec_decode(&codec, frame, (unsigned int)frame_size, NULL, 0))
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die_codec(&codec, "Failed to decode frame");
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while ((img = vpx_codec_get_frame(&codec, &iter)) != NULL) {
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unsigned char digest[16];
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get_image_md5(img, digest);
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print_md5(outfile, digest);
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fprintf(outfile, " img-%dx%d-%04d.i420\n",
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img->d_w, img->d_h, ++frame_cnt);
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}
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}
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printf("Processed %d frames.\n", frame_cnt);
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if (vpx_codec_destroy(&codec))
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die_codec(&codec, "Failed to destroy codec.");
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vpx_video_reader_close(reader);
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fclose(outfile);
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return EXIT_SUCCESS;
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}
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