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29 #ifndef AudioDestination_h
30 #define AudioDestination_h
32 #include "platform/audio/AudioBus.h"
33 #include "platform/audio/AudioIOCallback.h"
34 #include "platform/audio/AudioSourceProvider.h"
35 #include "public/platform/WebAudioDevice.h"
36 #include "public/platform/WebVector.h"
37 #include "wtf/Noncopyable.h"
38 #include "wtf/text/WTFString.h"
45 // An AudioDestination using Chromium's audio system
47 class PLATFORM_EXPORT AudioDestination : public WebAudioDevice::RenderCallback, public AudioSourceProvider {
48 WTF_MAKE_NONCOPYABLE(AudioDestination);
50 AudioDestination(AudioIOCallback&, const String& inputDeviceId, unsigned numberOfInputChannels, unsigned numberOfOutputChannels, float sampleRate);
51 virtual ~AudioDestination();
53 // Pass in (numberOfInputChannels > 0) if live/local audio input is desired.
54 // Port-specific device identification information for live/local input streams can be passed in the inputDeviceId.
55 static PassOwnPtr<AudioDestination> create(AudioIOCallback&, const String& inputDeviceId, unsigned numberOfInputChannels, unsigned numberOfOutputChannels, float sampleRate);
59 bool isPlaying() { return m_isPlaying; }
61 float sampleRate() const { return m_sampleRate; }
63 // WebAudioDevice::RenderCallback
64 virtual void render(const WebVector<float*>& sourceData, const WebVector<float*>& audioData, size_t numberOfFrames) override;
66 // AudioSourceProvider
67 virtual void provideInput(AudioBus*, size_t framesToProcess) override;
69 static float hardwareSampleRate();
71 // maxChannelCount() returns the total number of output channels of the audio hardware.
72 // A value of 0 indicates that the number of channels cannot be configured and
73 // that only stereo (2-channel) destinations can be created.
74 // The numberOfOutputChannels parameter of AudioDestination::create() is allowed to
75 // be a value: 1 <= numberOfOutputChannels <= maxChannelCount(),
76 // or if maxChannelCount() equals 0, then numberOfOutputChannels must be 2.
77 static unsigned long maxChannelCount();
80 AudioIOCallback& m_callback;
81 unsigned m_numberOfOutputChannels;
82 RefPtr<AudioBus> m_inputBus;
83 RefPtr<AudioBus> m_renderBus;
86 OwnPtr<WebAudioDevice> m_audioDevice;
87 size_t m_callbackBufferSize;
89 OwnPtr<AudioFIFO> m_inputFifo;
90 OwnPtr<AudioPullFIFO> m_fifo;
95 #endif // AudioDestination_h