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* Copyright 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.
#include <string>
#include "absl/types/optional.h"
#include "api/video/video_frame.h"
#include "api/video/video_sink_interface.h"
#include "api/video/video_source_interface.h"
#include "call/adaptation/video_source_restrictions.h"
#include "rtc_base/critical_section.h"
namespace webrtc {
// Responsible for configuring source/sink settings, i.e. performing
// rtc::VideoSourceInterface<VideoFrame>::AddOrUpdateSink(). It does this by
// storing settings internally which are converted to rtc::VideoSinkWants when
// PushSourceSinkSettings() is performed.
class VideoSourceSinkController {
VideoSourceSinkController(rtc::VideoSinkInterface<VideoFrame>* sink,
rtc::VideoSourceInterface<VideoFrame>* source);
void SetSource(rtc::VideoSourceInterface<VideoFrame>* source);
// Must be called in order for changes to settings to have an effect. This
// allows you to modify multiple properties in a single push to the sink.
void PushSourceSinkSettings();
VideoSourceRestrictions restrictions() const;
absl::optional<size_t> pixels_per_frame_upper_limit() const;
absl::optional<double> frame_rate_upper_limit() const;
bool rotation_applied() const;
int resolution_alignment() const;
// Updates the settings stored internally. In order for these settings to be
// applied to the sink, PushSourceSinkSettings() must subsequently be called.
void SetRestrictions(VideoSourceRestrictions restrictions);
void SetPixelsPerFrameUpperLimit(
absl::optional<size_t> pixels_per_frame_upper_limit);
void SetFrameRateUpperLimit(absl::optional<double> frame_rate_upper_limit);
void SetRotationApplied(bool rotation_applied);
void SetResolutionAlignment(int resolution_alignment);
rtc::VideoSinkWants CurrentSettingsToSinkWants() const
mutable rtc::CriticalSection crit_;
rtc::VideoSinkInterface<VideoFrame>* const sink_;
rtc::VideoSourceInterface<VideoFrame>* source_ RTC_GUARDED_BY(&crit_);
// Pixel and frame rate restrictions.
VideoSourceRestrictions restrictions_ RTC_GUARDED_BY(&crit_);
// Ensures that even if we are not restricted, the sink is never configured
// above this limit. Example: We are not CPU limited (no |restrictions_|) but
// our encoder is capped at 30 fps (= |frame_rate_upper_limit_|).
absl::optional<size_t> pixels_per_frame_upper_limit_ RTC_GUARDED_BY(&crit_);
absl::optional<double> frame_rate_upper_limit_ RTC_GUARDED_BY(&crit_);
bool rotation_applied_ RTC_GUARDED_BY(&crit_) = false;
int resolution_alignment_ RTC_GUARDED_BY(&crit_) = 1;
} // namespace webrtc