| /* |
| * 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 AudioNodeInput_h |
| #define AudioNodeInput_h |
| |
| #include "modules/webaudio/AudioNode.h" |
| #include "modules/webaudio/AudioSummingJunction.h" |
| #include "platform/audio/AudioBus.h" |
| #include "wtf/Allocator.h" |
| #include "wtf/HashSet.h" |
| #include <memory> |
| |
| namespace blink { |
| |
| class AudioNodeOutput; |
| |
| // An AudioNodeInput represents an input to an AudioNode and can be connected |
| // from one or more AudioNodeOutputs. In the case of multiple connections, the |
| // input will act as a unity-gain summing junction, mixing all the outputs. The |
| // number of channels of the input's bus is the maximum of the number of |
| // channels of all its connections. |
| |
| class AudioNodeInput final : public AudioSummingJunction { |
| USING_FAST_MALLOC(AudioNodeInput); |
| |
| public: |
| static std::unique_ptr<AudioNodeInput> create(AudioHandler&); |
| |
| // AudioSummingJunction |
| void didUpdate() override; |
| |
| // Can be called from any thread. |
| AudioHandler& handler() const { return m_handler; } |
| |
| // Must be called with the context's graph lock. |
| void connect(AudioNodeOutput&); |
| void disconnect(AudioNodeOutput&); |
| |
| // disable() will take the output out of the active connections list and set |
| // aside in a disabled list. |
| // enable() will put the output back into the active connections list. |
| // Must be called with the context's graph lock. |
| void enable(AudioNodeOutput&); |
| void disable(AudioNodeOutput&); |
| |
| // pull() processes all of the AudioNodes connected to us. |
| // In the case of multiple connections it sums the result into an internal |
| // summing bus. In the single connection case, it allows in-place processing |
| // where possible using inPlaceBus. It returns the bus which it rendered |
| // into, returning inPlaceBus if in-place processing was performed. |
| // Called from context's audio thread. |
| AudioBus* pull(AudioBus* inPlaceBus, size_t framesToProcess); |
| |
| // bus() contains the rendered audio after pull() has been called for each |
| // time quantum. |
| // Called from context's audio thread. |
| AudioBus* bus(); |
| |
| // updateInternalBus() updates m_internalSummingBus appropriately for the |
| // number of channels. This must be called when we own the context's graph |
| // lock in the audio thread at the very start or end of the render quantum. |
| void updateInternalBus(); |
| |
| // The number of channels of the connection with the largest number of |
| // channels. |
| unsigned numberOfChannels() const; |
| |
| private: |
| explicit AudioNodeInput(AudioHandler&); |
| |
| // This reference is safe because the AudioHandler owns this AudioNodeInput |
| // object. |
| AudioHandler& m_handler; |
| |
| // m_disabledOutputs contains the AudioNodeOutputs which are disabled (will |
| // not be processed) by the audio graph rendering. But, from JavaScript's |
| // perspective, these outputs are still connected to us. |
| // Generally, these represent disabled connections from "notes" which have |
| // finished playing but are not yet garbage collected. |
| // These raw pointers are safe. Owner AudioNodes of these AudioNodeOutputs |
| // manage their lifetime, and AudioNode::dispose() disconnects all of |
| // connections. |
| HashSet<AudioNodeOutput*> m_disabledOutputs; |
| |
| // Called from context's audio thread. |
| AudioBus* internalSummingBus(); |
| void sumAllConnections(AudioBus* summingBus, size_t framesToProcess); |
| |
| RefPtr<AudioBus> m_internalSummingBus; |
| }; |
| |
| } // namespace blink |
| |
| #endif // AudioNodeInput_h |