| /* |
| * 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 THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_DEFAULT_AUDIO_DESTINATION_NODE_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_DEFAULT_AUDIO_DESTINATION_NODE_H_ |
| |
| #include <memory> |
| #include "third_party/blink/public/platform/web_audio_latency_hint.h" |
| #include "third_party/blink/renderer/modules/webaudio/audio_destination_node.h" |
| #include "third_party/blink/renderer/platform/audio/audio_destination.h" |
| #include "third_party/blink/renderer/platform/audio/audio_io_callback.h" |
| |
| namespace blink { |
| |
| class BaseAudioContext; |
| class ExceptionState; |
| class WebAudioLatencyHint; |
| |
| class DefaultAudioDestinationHandler final : public AudioDestinationHandler, |
| public AudioIOCallback { |
| public: |
| static scoped_refptr<DefaultAudioDestinationHandler> Create( |
| AudioNode&, |
| const WebAudioLatencyHint&); |
| ~DefaultAudioDestinationHandler() override; |
| |
| // For AudioHandler. |
| void Dispose() override; |
| void Initialize() override; |
| void Uninitialize() override; |
| void SetChannelCount(unsigned, ExceptionState&) override; |
| double LatencyTime() const override { return 0; } |
| double TailTime() const override { return 0; } |
| bool RequiresTailProcessing() const final { return false; } |
| |
| // For AudioDestinationHandler. |
| void StartRendering() override; |
| void StopRendering() override; |
| void Pause() override; |
| void Resume() override; |
| void RestartRendering() override; |
| uint32_t MaxChannelCount() const override; |
| double SampleRate() const override; |
| |
| // For AudioIOCallback. This is invoked by the platform audio destination to |
| // get the next render quantum into |destination_bus| and update |
| // |output_position|. |
| void Render(AudioBus* destination_bus, |
| uint32_t number_of_frames, |
| const AudioIOPosition& output_position, |
| const AudioIOCallbackMetric& metric) final; |
| |
| // Returns a hadrware callback buffer size from audio infra. |
| uint32_t GetCallbackBufferSize() const; |
| |
| // Returns a given frames-per-buffer size from audio infra. |
| int GetFramesPerBuffer() const; |
| |
| private: |
| explicit DefaultAudioDestinationHandler(AudioNode&, |
| const WebAudioLatencyHint&); |
| |
| void CreatePlatformDestination(); |
| void StartPlatformDestination(); |
| void StopPlatformDestination(); |
| |
| const WebAudioLatencyHint latency_hint_; |
| |
| // Holds the audio device thread that runs the real time audio context. |
| scoped_refptr<AudioDestination> platform_destination_; |
| }; |
| |
| // ----------------------------------------------------------------------------- |
| |
| class DefaultAudioDestinationNode final : public AudioDestinationNode { |
| public: |
| static DefaultAudioDestinationNode* Create(BaseAudioContext*, |
| const WebAudioLatencyHint&); |
| |
| explicit DefaultAudioDestinationNode(BaseAudioContext&, |
| const WebAudioLatencyHint&); |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_MODULES_WEBAUDIO_DEFAULT_AUDIO_DESTINATION_NODE_H_ |