| /* |
| * Copyright (C) 2010, 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 AudioDestinationNode_h |
| #define AudioDestinationNode_h |
| |
| #include "core/platform/audio/AudioBus.h" |
| #include "core/platform/audio/AudioIOCallback.h" |
| #include "core/platform/audio/AudioSourceProvider.h" |
| #include "modules/webaudio/AudioBuffer.h" |
| #include "modules/webaudio/AudioNode.h" |
| |
| namespace WebCore { |
| |
| class AudioBus; |
| class AudioContext; |
| |
| class AudioDestinationNode : public AudioNode, public AudioIOCallback { |
| public: |
| AudioDestinationNode(AudioContext*, float sampleRate); |
| virtual ~AudioDestinationNode(); |
| |
| // AudioNode |
| virtual void process(size_t) { }; // we're pulled by hardware so this is never called |
| virtual void reset() { m_currentSampleFrame = 0; }; |
| |
| // The audio hardware calls render() to get the next render quantum of audio into destinationBus. |
| // It will optionally give us local/live audio input in sourceBus (if it's not 0). |
| virtual void render(AudioBus* sourceBus, AudioBus* destinationBus, size_t numberOfFrames); |
| |
| size_t currentSampleFrame() const { return m_currentSampleFrame; } |
| double currentTime() const { return currentSampleFrame() / static_cast<double>(sampleRate()); } |
| |
| virtual unsigned long maxChannelCount() const { return 0; } |
| |
| // Enable local/live input for the specified device. |
| virtual void enableInput(const String& inputDeviceId) = 0; |
| |
| virtual void startRendering() = 0; |
| |
| AudioSourceProvider* localAudioInputProvider() { return &m_localAudioInputProvider; } |
| |
| protected: |
| // LocalAudioInputProvider allows us to expose an AudioSourceProvider for local/live audio input. |
| // If there is local/live audio input, we call set() with the audio input data every render quantum. |
| class LocalAudioInputProvider : public AudioSourceProvider { |
| public: |
| LocalAudioInputProvider() |
| : m_sourceBus(AudioBus::create(2, AudioNode::ProcessingSizeInFrames)) // FIXME: handle non-stereo local input. |
| { |
| } |
| |
| void set(AudioBus* bus) |
| { |
| if (bus) |
| m_sourceBus->copyFrom(*bus); |
| } |
| |
| // AudioSourceProvider. |
| virtual void provideInput(AudioBus* destinationBus, size_t numberOfFrames) |
| { |
| bool isGood = destinationBus && destinationBus->length() == numberOfFrames && m_sourceBus->length() == numberOfFrames; |
| ASSERT(isGood); |
| if (isGood) |
| destinationBus->copyFrom(*m_sourceBus); |
| } |
| |
| private: |
| RefPtr<AudioBus> m_sourceBus; |
| }; |
| |
| virtual double tailTime() const OVERRIDE { return 0; } |
| virtual double latencyTime() const OVERRIDE { return 0; } |
| |
| // Counts the number of sample-frames processed by the destination. |
| size_t m_currentSampleFrame; |
| |
| LocalAudioInputProvider m_localAudioInputProvider; |
| }; |
| |
| } // namespace WebCore |
| |
| #endif // AudioDestinationNode_h |