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/*
* Copyright (c) 2018 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.
*/
#ifndef RTC_TOOLS_FRAME_ANALYZER_VIDEO_TEMPORAL_ALIGNER_H_
#define RTC_TOOLS_FRAME_ANALYZER_VIDEO_TEMPORAL_ALIGNER_H_
#include <stddef.h>
#include <vector>
#include "api/scoped_refptr.h"
#include "rtc_tools/video_file_reader.h"
namespace webrtc {
namespace test {
// Returns a vector with the same size as the given test video. Each index
// corresponds to what reference frame that test frame matches to. These
// indices are strictly increasing and might loop around the reference video,
// e.g. their values can be bigger than the number of frames in the reference
// video and they should be interpreted modulo that size. The matching frames
// will be determined by maximizing SSIM.
std::vector<size_t> FindMatchingFrameIndices(
const scoped_refptr<Video>& reference_video,
const scoped_refptr<Video>& test_video);
// Generate a new video using the frames from the original video. The returned
// video will have the same number of frames as the size of `indices`, and
// frame nr i in the returned video will point to frame nr indices[i] in the
// original video.
scoped_refptr<Video> ReorderVideo(const scoped_refptr<Video>& video,
const std::vector<size_t>& indices);
// Returns a modified version of the reference video where the frames have
// been aligned to the test video. The test video is assumed to be captured
// during a quality measurement test where the reference video is the source.
// The test video may start at an arbitrary position in the reference video
// and there might be missing frames. The reference video is assumed to loop
// over when it reaches the end. The returned result is a version of the
// reference video where the missing frames are left out so it aligns to the
// test video.
scoped_refptr<Video> GenerateAlignedReferenceVideo(
const scoped_refptr<Video>& reference_video,
const scoped_refptr<Video>& test_video);
// As above, but using precalculated indices.
scoped_refptr<Video> GenerateAlignedReferenceVideo(
const scoped_refptr<Video>& reference_video,
const std::vector<size_t>& indices);
} // namespace test
} // namespace webrtc
#endif // RTC_TOOLS_FRAME_ANALYZER_VIDEO_TEMPORAL_ALIGNER_H_
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