| /* |
| * 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/PassRefPtr.h" |
| #include "wtf/ThreadingPrimitives.h" |
| #include <memory> |
| |
| namespace blink { |
| |
| class BaseAudioContext; |
| class HTMLMediaElement; |
| class MediaElementAudioSourceOptions; |
| |
| 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. |
| Persistent<HTMLMediaElement> m_mediaElement; |
| Mutex m_processLock; |
| |
| unsigned m_sourceNumberOfChannels; |
| double m_sourceSampleRate; |
| |
| std::unique_ptr<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(BaseAudioContext&, |
| HTMLMediaElement&, |
| ExceptionState&); |
| static MediaElementAudioSourceNode* create( |
| BaseAudioContext*, |
| const MediaElementAudioSourceOptions&, |
| ExceptionState&); |
| |
| 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(BaseAudioContext&, HTMLMediaElement&); |
| }; |
| |
| } // namespace blink |
| |
| #endif // MediaElementAudioSourceNode_h |