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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_MEDIA_AUDIO_DUCKER_H_
#define CHROME_BROWSER_MEDIA_AUDIO_DUCKER_H_
#include "build/build_config.h"
#include "content/public/browser/page_user_data.h"
#include "content/public/browser/web_contents_observer.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "services/media_session/public/mojom/audio_focus.mojom.h"
#if BUILDFLAG(IS_WIN)
namespace media {
class AudioDuckerWin;
} // namespace media
#endif // BUILDFLAG(IS_WIN)
// The AudioDucker ducks other audio in Chrome besides what is playing through
// its associated Page's WebContents. Additionally, on Windows only, the
// AudioDucker ducks audio from other applications.
class AudioDucker : public content::PageUserData<AudioDucker>,
public content::WebContentsObserver {
public:
enum class AudioDuckingState {
// The AudioDucker is not currently ducking other audio.
kNoDucking,
// The AudioDucker is currently ducking other audio.
kDucking,
};
AudioDucker(const AudioDucker&) = delete;
AudioDucker& operator=(const AudioDucker&) = delete;
~AudioDucker() override;
// Ducks all audio in Chrome except audio playback in our associated Page's
// WebContents. On Windows only, this also ducks audio from other
// applications. Returns true if ducking was started successfully or if we're
// already ducking.
bool StartDuckingOtherAudio();
// Stops ducking started by `StartDuckingOtherAudio()`. Does nothing if we're
// not currently ducking. Returns true if ducking was stopped successfully or
// if we're not currently ducking.
bool StopDuckingOtherAudio();
AudioDuckingState GetAudioDuckingState() const { return ducking_state_; }
private:
explicit AudioDucker(content::Page& page);
friend PageUserData;
PAGE_USER_DATA_KEY_DECL();
// content::WebContentsObserver:
void MediaSessionCreated(content::MediaSession*) override;
void StartDuckingImpl();
content::WebContents* GetWebContents() const;
// Binds |audio_focus_remote_| if it's not already bound. Returns true if
// |audio_focus_remote_| is already bound or has become bound.
bool BindToAudioFocusManagerIfNecessary();
#if BUILDFLAG(IS_WIN)
bool ShouldDuckProcess(base::ProcessId process_id) const;
// Responsible for ducking other applications on Windows.
std::unique_ptr<media::AudioDuckerWin> windows_ducker_;
#endif // BUILDFLAG(IS_WIN)
AudioDuckingState ducking_state_ = AudioDuckingState::kNoDucking;
mojo::Remote<media_session::mojom::AudioFocusManager> audio_focus_remote_;
};
#endif // CHROME_BROWSER_MEDIA_AUDIO_DUCKER_H_
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