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/*
* Copyright (c) 2012 The WebRTC 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <algorithm>
#include <string>
#include "absl/flags/flag.h"
#include "absl/flags/parse.h"
#include "absl/flags/usage.h"
#include "api/scoped_refptr.h"
#include "api/video/video_frame_buffer.h"
#include "rtc_tools/frame_analyzer/video_quality_analysis.h"
#include "rtc_tools/video_file_reader.h"
ABSL_FLAG(std::string,
results_file,
"results.txt",
"The full name of the file where the results will be written");
ABSL_FLAG(std::string,
reference_file,
"ref.yuv",
"The reference YUV file to compare against");
ABSL_FLAG(std::string,
test_file,
"test.yuv",
"The test YUV file to run the analysis for");
void CompareFiles(
const rtc::scoped_refptr<webrtc::test::Video>& reference_video,
const rtc::scoped_refptr<webrtc::test::Video>& test_video,
const char* results_file_name) {
FILE* results_file = fopen(results_file_name, "w");
const size_t num_frames = std::min(reference_video->number_of_frames(),
test_video->number_of_frames());
for (size_t i = 0; i < num_frames; ++i) {
const rtc::scoped_refptr<webrtc::I420BufferInterface> ref_buffer =
reference_video->GetFrame(i);
const rtc::scoped_refptr<webrtc::I420BufferInterface> test_buffer =
test_video->GetFrame(i);
// Calculate the PSNR and SSIM.
double result_psnr = webrtc::test::Psnr(ref_buffer, test_buffer);
double result_ssim = webrtc::test::Ssim(ref_buffer, test_buffer);
fprintf(results_file, "Frame: %zu, PSNR: %f, SSIM: %f\n", i, result_psnr,
result_ssim);
}
fclose(results_file);
}
/*
* A tool running PSNR and SSIM analysis on two videos - a reference video and a
* test video. The two videos should be I420 Y4M videos.
* The tool just runs PSNR and SSIM on the corresponding frames in the test and
* the reference videos until either the first or the second video runs out of
* frames. The result is written in a results text file in the format:
* Frame: <frame_number>, PSNR: <psnr_value>, SSIM: <ssim_value>
* Frame: <frame_number>, ........
*
* The max value for PSNR is 48.0 (between equal frames), as for SSIM it is 1.0.
*
* Usage:
* psnr_ssim_analyzer --reference_file=<name_of_file> --test_file=<name_of_file>
* --results_file=<name_of_file>
*/
int main(int argc, char* argv[]) {
absl::SetProgramUsageMessage(
"Runs PSNR and SSIM on two I420 videos and write the"
"results in a file.\n"
"Example usage:\n"
"./psnr_ssim_analyzer --reference_file=ref.yuv "
"--test_file=test.yuv --results_file=results.txt\n");
absl::ParseCommandLine(argc, argv);
rtc::scoped_refptr<webrtc::test::Video> reference_video =
webrtc::test::OpenY4mFile(absl::GetFlag(FLAGS_reference_file));
rtc::scoped_refptr<webrtc::test::Video> test_video =
webrtc::test::OpenY4mFile(absl::GetFlag(FLAGS_test_file));
if (!reference_video || !test_video) {
fprintf(stderr, "Error opening video files\n");
return 0;
}
if (reference_video->width() != test_video->width() ||
reference_video->height() != test_video->height()) {
fprintf(stderr,
"Reference and test video files do not have same size: %dx%d "
"versus %dx%d\n",
reference_video->width(), reference_video->height(),
test_video->width(), test_video->height());
return 0;
}
CompareFiles(reference_video, test_video,
absl::GetFlag(FLAGS_results_file).c_str());
return 0;
}
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