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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASTREAM_APPLY_CONSTRAINTS_PROCESSOR_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASTREAM_APPLY_CONSTRAINTS_PROCESSOR_H_
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/task/single_thread_task_runner.h"
#include "base/threading/thread_checker.h"
#include "media/base/scoped_async_trace.h"
#include "media/capture/video_capture_types.h"
#include "third_party/blink/public/mojom/mediastream/media_devices.mojom-blink-forward.h"
#include "third_party/blink/public/web/modules/mediastream/media_stream_video_source.h"
#include "third_party/blink/renderer/core/frame/local_frame.h"
#include "third_party/blink/renderer/modules/mediastream/apply_constraints_request.h"
#include "third_party/blink/renderer/modules/mediastream/media_stream_constraints_util.h"
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/platform/wtf/cross_thread_functional.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
namespace blink {
class MediaStreamAudioSource;
class MediaStreamVideoTrack;
// ApplyConstraintsProcessor is responsible for processing applyConstraints()
// requests. Only one applyConstraints() request can be processed at a time.
// ApplyConstraintsProcessor must be created, called and destroyed on the main
// render thread. There should be only one ApplyConstraintsProcessor per frame.
class MODULES_EXPORT ApplyConstraintsProcessor final
: public GarbageCollected<ApplyConstraintsProcessor> {
public:
using MediaDevicesDispatcherCallback = base::RepeatingCallback<
blink::mojom::blink::MediaDevicesDispatcherHost*()>;
ApplyConstraintsProcessor(
LocalFrame* frame,
MediaDevicesDispatcherCallback media_devices_dispatcher_cb,
scoped_refptr<base::SingleThreadTaskRunner> task_runner);
ApplyConstraintsProcessor(const ApplyConstraintsProcessor&) = delete;
ApplyConstraintsProcessor& operator=(const ApplyConstraintsProcessor&) =
delete;
~ApplyConstraintsProcessor();
// Starts processing of |request|. When processing of |request| is complete,
// it notifies by invoking |callback|.
// This method must be called only if there is no request currently being
// processed.
void ProcessRequest(blink::ApplyConstraintsRequest* request,
base::OnceClosure callback);
void Trace(Visitor* visitor) const {
visitor->Trace(current_request_);
visitor->Trace(frame_);
}
private:
// Helpers for video device-capture requests.
void ProcessVideoDeviceRequest();
void MaybeStopVideoDeviceSourceForRestart(
const Vector<media::VideoCaptureFormat>& formats);
void MaybeDeviceSourceStoppedForRestart(
blink::MediaStreamVideoSource::RestartResult result);
void FindNewFormatAndRestartDeviceSource(
const Vector<media::VideoCaptureFormat>& formats);
blink::VideoCaptureSettings SelectVideoDeviceSettings(
Vector<media::VideoCaptureFormat> formats);
// Helpers for video content-capture requests.
void ProcessVideoContentRequest();
void MaybeStopVideoContentSourceForRestart();
void MaybeRestartStoppedVideoContentSource(
blink::MediaStreamVideoSource::RestartResult result);
blink::VideoCaptureSettings SelectVideoContentSettings();
// Helpers for all video requests.
void ProcessVideoRequest();
blink::MediaStreamVideoTrack* GetCurrentVideoTrack();
blink::MediaStreamVideoSource* GetCurrentVideoSource();
bool AbortIfVideoRequestStateInvalid(); // Returns true if aborted.
void FinalizeVideoRequest();
void MaybeSourceRestarted(
blink::MediaStreamVideoSource::RestartResult result);
// Helpers for audio requests.
void ProcessAudioRequest();
blink::MediaStreamAudioSource* GetCurrentAudioSource();
// General helpers
void ApplyConstraintsSucceeded();
void ApplyConstraintsFailed(const char* failed_constraint_name);
void CannotApplyConstraints(const String& message);
void CleanupRequest(base::OnceClosure user_media_request_callback);
blink::mojom::blink::MediaDevicesDispatcherHost* GetMediaDevicesDispatcher();
// ApplyConstraints requests are processed sequentially. |current_request_|
// contains the request currently being processed, if any.
// |video_source_| and |request_completed_cb_| are the video source and
// reply callback for the current request.
Member<blink::ApplyConstraintsRequest> current_request_;
using ScopedMediaStreamTrace =
media::TypedScopedAsyncTrace<media::TraceCategory::kMediaStream>;
std::unique_ptr<ScopedMediaStreamTrace> video_device_request_trace_;
// TODO(crbug.com/704136): Change to use Member.
raw_ptr<blink::MediaStreamVideoSource> video_source_ = nullptr;
base::OnceClosure request_completed_cb_;
const Member<LocalFrame> frame_;
MediaDevicesDispatcherCallback media_devices_dispatcher_cb_;
THREAD_CHECKER(thread_checker_);
const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_MEDIASTREAM_APPLY_CONSTRAINTS_PROCESSOR_H_
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