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/*
* Copyright (C) 2012, Google Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_OFFLINE_AUDIO_CONTEXT_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_OFFLINE_AUDIO_CONTEXT_H_
#include "third_party/blink/renderer/modules/modules_export.h"
#include "third_party/blink/renderer/modules/webaudio/base_audio_context.h"
#include "third_party/blink/renderer/platform/wtf/hash_map.h"
namespace blink {
class ExceptionState;
class OfflineAudioContextOptions;
class OfflineAudioDestinationHandler;
class MODULES_EXPORT OfflineAudioContext final : public BaseAudioContext {
DEFINE_WRAPPERTYPEINFO();
public:
static OfflineAudioContext* Create(ExecutionContext*,
unsigned number_of_channels,
unsigned number_of_frames,
float sample_rate,
ExceptionState&);
static OfflineAudioContext* Create(ExecutionContext*,
const OfflineAudioContextOptions*,
ExceptionState&);
OfflineAudioContext(Document*,
unsigned number_of_channels,
uint32_t number_of_frames,
float sample_rate,
ExceptionState&);
~OfflineAudioContext() override;
void Trace(Visitor*) const override;
uint32_t length() const { return total_render_frames_; }
ScriptPromise startOfflineRendering(ScriptState*, ExceptionState&);
ScriptPromise suspendContext(ScriptState*, double);
ScriptPromise resumeContext(ScriptState*);
void RejectPendingResolvers() override;
bool HasRealtimeConstraint() final { return false; }
bool IsPullingAudioGraph() const final;
DEFINE_ATTRIBUTE_EVENT_LISTENER(complete, kComplete)
// Fire completion event when the rendering is finished.
void FireCompletionEvent();
bool HandlePreRenderTasks(const AudioIOPosition* output_position,
const AudioCallbackMetric* metric) final;
void HandlePostRenderTasks() final;
// Resolve a suspend scheduled at the specified frame. With this specified
// frame as a unique key, the associated promise resolver can be retrieved
// from the map (m_scheduledSuspends) and resolved.
void ResolveSuspendOnMainThread(size_t);
// OfflineAudioContext is not affected by Autoplay, so this MUST do nothing.
void NotifySourceNodeStart() final {}
// The HashMap with 'zero' key is needed because |currentSampleFrame| can be
// zero.
using SuspendMap = HeapHashMap<size_t,
Member<ScriptPromiseResolver>,
DefaultHash<size_t>::Hash,
WTF::UnsignedWithZeroKeyHashTraits<size_t>>;
using OfflineGraphAutoLocker = DeferredTaskHandler::OfflineGraphAutoLocker;
// Document notification
bool HasPendingActivity() const final;
private:
// Fetch directly the destination handler.
OfflineAudioDestinationHandler& DestinationHandler();
// Check if the rendering needs to be suspended.
bool ShouldSuspend();
// This map is to store the timing of scheduled suspends (frame) and the
// associated promise resolver. This storage can only be modified by the
// main thread and accessed by the audio thread with the graph lock.
//
// The map consists of key-value pairs of:
// { size_t quantizedFrame: ScriptPromiseResolver resolver }
//
// Note that |quantizedFrame| is a unique key, since you can have only one
// suspend scheduled for a certain frame. Accessing to this must be
// protected by the offline context lock.
SuspendMap scheduled_suspends_;
Member<ScriptPromiseResolver> complete_resolver_;
// This flag is necessary to indicate the rendering has actually started or
// running. Note that initial state of context is 'Suspended', which is the
// same state when the context is suspended, so we cannot utilize it for this
// purpose.
bool is_rendering_started_;
// Total render sample length.
uint32_t total_render_frames_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_OFFLINE_AUDIO_CONTEXT_H_
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