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/*
* Copyright (C) 2011, 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 MediaElementAudioSourceNode_h
#define MediaElementAudioSourceNode_h
#include "modules/webaudio/AudioSourceNode.h"
#include "platform/audio/AudioSourceProviderClient.h"
#include "platform/audio/MultiChannelResampler.h"
#include "wtf/OwnPtr.h"
#include "wtf/PassRefPtr.h"
#include "wtf/ThreadingPrimitives.h"
namespace blink {
class AbstractAudioContext;
class HTMLMediaElement;
class MediaElementAudioSourceHandler final : public AudioHandler {
public:
static PassRefPtr<MediaElementAudioSourceHandler> create(AudioNode&, HTMLMediaElement&);
~MediaElementAudioSourceHandler() override;
HTMLMediaElement* mediaElement() { return m_mediaElement.get(); }
// AudioHandler
void dispose() override;
void process(size_t framesToProcess) override;
// Helpers for AudioSourceProviderClient implementation of
// MediaElementAudioSourceNode.
void setFormat(size_t numberOfChannels, float sampleRate);
void onCurrentSrcChanged(const KURL& currentSrc);
void lock();
void unlock();
private:
MediaElementAudioSourceHandler(AudioNode&, HTMLMediaElement&);
// As an audio source, we will never propagate silence.
bool propagatesSilence() const override { return false; }
// Must be called only on the audio thread.
bool passesCORSAccessCheck();
// Must be called only on the main thread.
bool passesCurrentSrcCORSAccessCheck(const KURL& currentSrc);
// Print warning if CORS restrictions cause MediaElementAudioSource to output zeroes.
void printCORSMessage(const String& message);
// This Persistent doesn't make a reference cycle. The reference from
// HTMLMediaElement to AudioSourceProvideClient, which
// MediaElementAudioSourceNode implements, is weak.
RefPtrWillBePersistent<HTMLMediaElement> m_mediaElement;
Mutex m_processLock;
unsigned m_sourceNumberOfChannels;
double m_sourceSampleRate;
OwnPtr<MultiChannelResampler> m_multiChannelResampler;
// |m_passesCurrentSrcCORSAccessCheck| holds the value of
// context()->getSecurityOrigin() && context()->getSecurityOrigin()->canRequest(mediaElement()->currentSrc()),
// updated in the ctor and onCurrentSrcChanged() on the main thread and
// used in passesCORSAccessCheck() on the audio thread,
// protected by |m_processLock|.
bool m_passesCurrentSrcCORSAccessCheck;
// Indicates if we need to print a CORS message if the current source has changed and we have no
// access to it. Must be protected by |m_processLock|.
bool m_maybePrintCORSMessage;
// The value of mediaElement()->currentSrc().string() in the ctor and onCurrentSrcChanged().
// Protected by |m_processLock|.
String m_currentSrcString;
};
class MediaElementAudioSourceNode final : public AudioSourceNode, public AudioSourceProviderClient {
DEFINE_WRAPPERTYPEINFO();
USING_GARBAGE_COLLECTED_MIXIN(MediaElementAudioSourceNode);
public:
static MediaElementAudioSourceNode* create(AbstractAudioContext&, HTMLMediaElement&);
DECLARE_VIRTUAL_TRACE();
MediaElementAudioSourceHandler& mediaElementAudioSourceHandler() const;
HTMLMediaElement* mediaElement() const;
// AudioSourceProviderClient functions:
void setFormat(size_t numberOfChannels, float sampleRate) override;
void onCurrentSrcChanged(const KURL& currentSrc) override;
void lock() override;
void unlock() override;
private:
MediaElementAudioSourceNode(AbstractAudioContext&, HTMLMediaElement&);
};
} // namespace blink
#endif // MediaElementAudioSourceNode_h
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