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// Copyright 2018 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_WEBAUDIO_AUDIO_CONTEXT_MANAGER_IMPL_H_
#define CONTENT_BROWSER_MEDIA_WEBAUDIO_AUDIO_CONTEXT_MANAGER_IMPL_H_
#include "base/memory/raw_ptr.h"
#include "base/time/time.h"
#include "content/common/content_export.h"
#include "content/public/browser/document_service.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "third_party/blink/public/mojom/webaudio/audio_context_manager.mojom.h"
namespace base {
class TickClock;
}
namespace content {
class RenderFrameHost;
// Implements the mojo interface between WebAudio and the browser so that
// WebAudio can report when audible sounds from an AudioContext starts and
// stops. A manager instance can be associated with multiple AudioContexts.
//
// We do not expect to see more than 3~4 AudioContexts per render frame, so
// handling multiple contexts would not be a significant bottle neck.
class CONTENT_EXPORT AudioContextManagerImpl final
: public content::DocumentService<blink::mojom::AudioContextManager> {
public:
AudioContextManagerImpl(const AudioContextManagerImpl&) = delete;
AudioContextManagerImpl& operator=(const AudioContextManagerImpl&) = delete;
static void Create(
RenderFrameHost* render_frame_host,
mojo::PendingReceiver<blink::mojom::AudioContextManager> receiver);
static AudioContextManagerImpl& CreateForTesting(
RenderFrameHost& render_frame_host,
mojo::PendingReceiver<blink::mojom::AudioContextManager> receiver);
// blink::mojom::AudioContextManager implementations.
// Notify observers that audible audio started/stopped playing from an
// AudioContext.
void AudioContextAudiblePlaybackStarted(uint32_t audio_context_id) final;
void AudioContextAudiblePlaybackStopped(uint32_t audio_context_id) final;
// Tracks the creation or closure of a AudioContext to maintain the count of
// concurrent contexts.
void AudioContextCreated(uint32_t audio_context_id) final;
void AudioContextClosed(uint32_t audio_context_id) final;
void set_clock_for_testing(base::TickClock* clock) { clock_ = clock; }
private:
explicit AudioContextManagerImpl(
RenderFrameHost& render_frame_host,
mojo::PendingReceiver<blink::mojom::AudioContextManager> receiver);
~AudioContextManagerImpl() override;
FRIEND_TEST_ALL_PREFIXES(AudioContextManagerImplTest,
TracksMaxConcurrentContexts);
FRIEND_TEST_ALL_PREFIXES(AudioContextManagerImplTest, NoContextsCreated);
// Send measured audible duration to UKM database.
void RecordAudibleTime(base::TimeDelta);
// To track pending audible time. Stores ID of AudioContext (uint32_t) and
// the start time of audible period (base::TimeTicks).
base::flat_map<uint32_t, base::TimeTicks> pending_audible_durations_;
// Clock used to calculate time between start and stop event. Can be override
// by tests.
// It is not owned by the implementation.
raw_ptr<const base::TickClock> clock_;
// The set of currently active AudioContexts in the frame. Used to track the
// maximum number of concurrent contexts.
base::flat_set<uint32_t> concurrent_audio_context_ids_;
// The maximum number of concurrent AudioContexts observed during the lifetime
// of this manager. This value is recorded to a UMA histogram on destruction.
size_t max_concurrent_audio_contexts_ = 0;
};
} // namespace content
#endif // CONTENT_BROWSER_MEDIA_WEBAUDIO_AUDIO_CONTEXT_MANAGER_IMPL_H_
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