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/*
* Copyright (c) 2020 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 VIDEO_ALIGNMENT_ADJUSTER_H_
#define VIDEO_ALIGNMENT_ADJUSTER_H_
#include "api/video_codecs/video_encoder.h"
#include "video/config/video_encoder_config.h"
namespace webrtc {
class AlignmentAdjuster {
public:
// Returns the resolution alignment requested by the encoder (i.e
// `EncoderInfo::requested_resolution_alignment` which ensures that delivered
// frames to the encoder are divisible by this alignment).
//
// If `EncoderInfo::apply_alignment_to_all_simulcast_layers` is enabled, the
// alignment will be adjusted to ensure that each simulcast layer also is
// divisible by `requested_resolution_alignment`. The configured scale factors
// `scale_resolution_down_by` may be adjusted to a common multiple to limit
// the alignment value to avoid largely cropped frames and possibly with an
// aspect ratio far from the original.
// Note: `max_layers` currently only taken into account when using default
// scale factors.
static int GetAlignmentAndMaybeAdjustScaleFactors(
const VideoEncoder::EncoderInfo& info,
VideoEncoderConfig* config,
absl::optional<size_t> max_layers);
};
} // namespace webrtc
#endif // VIDEO_ALIGNMENT_ADJUSTER_H_
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