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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_MEDIA_CAPTURE_HANDLE_MANAGER_H_
#define CONTENT_BROWSER_MEDIA_CAPTURE_HANDLE_MANAGER_H_
#include <map>
#include <memory>
#include <vector>
#include "base/functional/callback.h"
#include "content/common/content_export.h"
#include "content/public/browser/global_routing_id.h"
#include "media/mojo/mojom/capture_handle.mojom.h"
#include "third_party/blink/public/common/mediastream/media_stream_request.h"
#include "third_party/blink/public/mojom/mediastream/media_stream.mojom.h"
namespace content {
// This class lives on the UI thread.
// TODO(crbug.com/40181897): Document this class.
class CONTENT_EXPORT CaptureHandleManager {
public:
using DeviceCaptureHandleChangeCallback = base::RepeatingCallback<void(
const std::string& label,
blink::mojom::MediaStreamType type,
media::mojom::CaptureHandlePtr capture_handle)>;
CaptureHandleManager();
CaptureHandleManager(const CaptureHandleManager&) = delete;
CaptureHandleManager& operator=(const CaptureHandleManager&) = delete;
virtual ~CaptureHandleManager();
// This method should be called after starting a video capture session of
// a MediaStreamDevice, to subscribe for its CaptureHandle changes.
// The permission to observe the CaptureHandle depends on |capturer|'s origin.
void OnTabCaptureStarted(
const std::string& label,
const blink::MediaStreamDevice& captured_device,
GlobalRenderFrameHostId capturer,
DeviceCaptureHandleChangeCallback handle_change_callback);
// Stops tracking a previously tracked capture session.
void OnTabCaptureStopped(const std::string& label,
const blink::MediaStreamDevice& captured_device);
// Should be called when devices change. It is essentially equivalent to
// calling OnTabCaptureStopped() on all sessions with the right |label|,
// then calling OnTabCaptureStarted() on all |new_devices|.
void OnTabCaptureDevicesUpdated(
const std::string& label,
blink::mojom::StreamDevicesSetPtr new_stream_devices,
GlobalRenderFrameHostId capturer,
DeviceCaptureHandleChangeCallback handle_change_callback);
private:
// Tracks a single captured WebContents and informs its capturer of changes
// to the CaptureHandle.
class Observer;
// Uniquely identifies a capture session.
struct CaptureKey {
bool operator<(const CaptureKey& other) const {
return std::tie(label, type) < std::tie(other.label, other.type);
}
std::string label;
blink::mojom::MediaStreamType type;
};
// All the information this manager holds about a given capture.
struct CaptureInfo {
CaptureInfo(std::unique_ptr<Observer> observer,
media::mojom::CaptureHandlePtr last_capture_handle,
DeviceCaptureHandleChangeCallback callback);
~CaptureInfo();
std::unique_ptr<Observer> observer;
media::mojom::CaptureHandlePtr last_capture_handle;
DeviceCaptureHandleChangeCallback callback;
};
// Called by Observer whenever a new CaptureHandle config is observed.
// Allows CaptureHandleManager to decide if a corresponding
// DeviceCaptureHandleChangeCallback should be called.
void OnCaptureHandleConfigUpdate(
const std::string& label,
blink::mojom::MediaStreamType type,
media::mojom::CaptureHandlePtr capture_handle);
// Maps each capture session to everything we hold about it - the observer
// that tracks it, the last reported CaptureHandle, etc.
std::map<CaptureKey, std::unique_ptr<CaptureInfo>> captures_;
};
} // namespace content
#endif // CONTENT_BROWSER_MEDIA_CAPTURE_HANDLE_MANAGER_H_
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