scalability_mode_util.h

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/*

 *  Copyright (c) 2022 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 MODULES_VIDEO_CODING_SVC_SCALABILITY_MODE_UTIL_H_

#define MODULES_VIDEO_CODING_SVC_SCALABILITY_MODE_UTIL_H_

#include "absl/strings/string_view.h"

#include "absl/types/optional.h"

#include "api/video_codecs/scalability_mode.h"

#include "api/video_codecs/video_codec.h"

namespace webrtc {

enum class ScalabilityModeResolutionRatio {

  kTwoToOne,    // The resolution ratio between spatial layers is 2:1.

  kThreeToTwo,  // The resolution ratio between spatial layers is 1.5:1.

};

static constexpr char kDefaultScalabilityModeStr[] = "L1T2";

RTC_EXPORT absl::optional<ScalabilityMode> MakeScalabilityMode(

    int num_spatial_layers,

    int num_temporal_layers,

    InterLayerPredMode inter_layer_pred,

    absl::optional<ScalabilityModeResolutionRatio> ratio,

    bool shift);

absl::optional<ScalabilityMode> ScalabilityModeFromString(

    absl::string_view scalability_mode_string);

InterLayerPredMode ScalabilityModeToInterLayerPredMode(

    ScalabilityMode scalability_mode);

int ScalabilityModeToNumSpatialLayers(ScalabilityMode scalability_mode);

int ScalabilityModeToNumTemporalLayers(ScalabilityMode scalability_mode);

absl::optional<ScalabilityModeResolutionRatio> ScalabilityModeToResolutionRatio(

    ScalabilityMode scalability_mode);

bool ScalabilityModeIsShiftMode(ScalabilityMode scalability_mode);

ScalabilityMode LimitNumSpatialLayers(ScalabilityMode scalability_mode,

                                      int max_spatial_layers);

}  // namespace webrtc

#endif  // MODULES_VIDEO_CODING_SVC_SCALABILITY_MODE_UTIL_H_