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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 <optional>
#include "absl/strings/string_view.h"
#include "api/video_codecs/scalability_mode.h"
#include "api/video_codecs/video_codec.h"
#include "rtc_base/system/rtc_export.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";
// Scalability mode to be used if falling back to default scalability mode is
// unsupported.
static constexpr char kNoLayeringScalabilityModeStr[] = "L1T1";
RTC_EXPORT std::optional<ScalabilityMode> MakeScalabilityMode(
int num_spatial_layers,
int num_temporal_layers,
InterLayerPredMode inter_layer_pred,
std::optional<ScalabilityModeResolutionRatio> ratio,
bool shift);
RTC_EXPORT std::optional<ScalabilityMode> ScalabilityModeFromString(
absl::string_view scalability_mode_string);
InterLayerPredMode ScalabilityModeToInterLayerPredMode(
ScalabilityMode scalability_mode);
int ScalabilityModeToNumSpatialLayers(ScalabilityMode scalability_mode);
int ScalabilityModeToNumTemporalLayers(ScalabilityMode scalability_mode);
std::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_
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