87 lines
3.6 KiB
C++
87 lines
3.6 KiB
C++
/*
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* Copyright 2020 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef CALL_ADAPTATION_VIDEO_SOURCE_RESTRICTIONS_H_
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#define CALL_ADAPTATION_VIDEO_SOURCE_RESTRICTIONS_H_
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#include <string>
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#include <utility>
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#include "absl/types/optional.h"
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namespace webrtc {
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// Describes optional restrictions to the resolution and frame rate of a video
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// source.
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class VideoSourceRestrictions {
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public:
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// Constructs without any restrictions.
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VideoSourceRestrictions();
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// All values must be positive or nullopt.
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// TODO(hbos): Support expressing "disable this stream"?
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VideoSourceRestrictions(absl::optional<size_t> max_pixels_per_frame,
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absl::optional<size_t> target_pixels_per_frame,
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absl::optional<double> max_frame_rate);
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bool operator==(const VideoSourceRestrictions& rhs) const {
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return max_pixels_per_frame_ == rhs.max_pixels_per_frame_ &&
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target_pixels_per_frame_ == rhs.target_pixels_per_frame_ &&
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max_frame_rate_ == rhs.max_frame_rate_;
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}
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bool operator!=(const VideoSourceRestrictions& rhs) const {
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return !(*this == rhs);
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}
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std::string ToString() const;
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// The source must produce a resolution less than or equal to
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// max_pixels_per_frame().
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const absl::optional<size_t>& max_pixels_per_frame() const;
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// The source should produce a resolution as close to the
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// target_pixels_per_frame() as possible, provided this does not exceed
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// max_pixels_per_frame().
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// The actual pixel count selected depends on the capabilities of the source.
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// TODO(hbos): Clarify how "target" is used. One possible implementation: open
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// the camera in the smallest resolution that is greater than or equal to the
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// target and scale it down to the target if it is greater. Is this an
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// accurate description of what this does today, or do we do something else?
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const absl::optional<size_t>& target_pixels_per_frame() const;
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const absl::optional<double>& max_frame_rate() const;
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void set_max_pixels_per_frame(absl::optional<size_t> max_pixels_per_frame);
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void set_target_pixels_per_frame(
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absl::optional<size_t> target_pixels_per_frame);
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void set_max_frame_rate(absl::optional<double> max_frame_rate);
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private:
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// These map to rtc::VideoSinkWants's |max_pixel_count| and
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// |target_pixel_count|.
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absl::optional<size_t> max_pixels_per_frame_;
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absl::optional<size_t> target_pixels_per_frame_;
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absl::optional<double> max_frame_rate_;
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};
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bool DidRestrictionsIncrease(VideoSourceRestrictions before,
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VideoSourceRestrictions after);
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bool DidRestrictionsDecrease(VideoSourceRestrictions before,
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VideoSourceRestrictions after);
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bool DidIncreaseResolution(VideoSourceRestrictions restrictions_before,
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VideoSourceRestrictions restrictions_after);
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bool DidDecreaseResolution(VideoSourceRestrictions restrictions_before,
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VideoSourceRestrictions restrictions_after);
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bool DidIncreaseFrameRate(VideoSourceRestrictions restrictions_before,
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VideoSourceRestrictions restrictions_after);
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bool DidDecreaseFrameRate(VideoSourceRestrictions restrictions_before,
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VideoSourceRestrictions restrictions_after);
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} // namespace webrtc
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#endif // CALL_ADAPTATION_VIDEO_SOURCE_RESTRICTIONS_H_
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