OLD | NEW |
1 /* | 1 /* |
2 * Copyright (C) 2010 Google Inc. All rights reserved. | 2 * Copyright (C) 2010 Google Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * | 7 * |
8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
(...skipping 11 matching lines...) Expand all Loading... |
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | 22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | 23 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 */ | 27 */ |
28 | 28 |
29 #ifndef AudioDestination_h | 29 #ifndef AudioDestination_h |
30 #define AudioDestination_h | 30 #define AudioDestination_h |
31 | 31 |
32 #include "platform/PlatformExport.h" | 32 #include "platform/audio/AudioBus.h" |
33 #include "wtf/OwnPtr.h" | 33 #include "platform/audio/AudioIOCallback.h" |
34 #include "wtf/PassOwnPtr.h" | 34 #include "platform/audio/AudioSourceProvider.h" |
| 35 #include "public/platform/WebAudioDevice.h" |
| 36 #include "public/platform/WebVector.h" |
| 37 #include "wtf/Noncopyable.h" |
35 #include "wtf/text/WTFString.h" | 38 #include "wtf/text/WTFString.h" |
36 | 39 |
37 namespace WebCore { | 40 namespace WebCore { |
38 | 41 |
39 class AudioIOCallback; | 42 class AudioFIFO; |
| 43 class AudioPullFIFO; |
40 | 44 |
41 // AudioDestination is an abstraction for audio hardware I/O. | 45 // An AudioDestination using Chromium's audio system |
42 // The audio hardware periodically calls the AudioIOCallback render() method ask
ing it to render/output the next render quantum of audio. | |
43 // It optionally will pass in local/live audio input when it calls render(). | |
44 | 46 |
45 class PLATFORM_EXPORT AudioDestination { | 47 class PLATFORM_EXPORT AudioDestination : public blink::WebAudioDevice::RenderCal
lback, public AudioSourceProvider { |
| 48 WTF_MAKE_NONCOPYABLE(AudioDestination); |
46 public: | 49 public: |
| 50 AudioDestination(AudioIOCallback&, const String& inputDeviceId, unsigned num
berOfInputChannels, unsigned numberOfOutputChannels, float sampleRate); |
| 51 virtual ~AudioDestination(); |
| 52 |
47 // Pass in (numberOfInputChannels > 0) if live/local audio input is desired. | 53 // Pass in (numberOfInputChannels > 0) if live/local audio input is desired. |
48 // Port-specific device identification information for live/local input stre
ams can be passed in the inputDeviceId. | 54 // Port-specific device identification information for live/local input stre
ams can be passed in the inputDeviceId. |
49 static PassOwnPtr<AudioDestination> create(AudioIOCallback&, const String& i
nputDeviceId, unsigned numberOfInputChannels, unsigned numberOfOutputChannels, f
loat sampleRate); | 55 static PassOwnPtr<AudioDestination> create(AudioIOCallback&, const String& i
nputDeviceId, unsigned numberOfInputChannels, unsigned numberOfOutputChannels, f
loat sampleRate); |
50 | 56 |
51 virtual ~AudioDestination() { } | 57 virtual void start(); |
| 58 virtual void stop(); |
| 59 bool isPlaying() { return m_isPlaying; } |
52 | 60 |
53 virtual void start() = 0; | 61 float sampleRate() const { return m_sampleRate; } |
54 virtual void stop() = 0; | |
55 virtual bool isPlaying() = 0; | |
56 | 62 |
57 // Sample-rate conversion may happen in AudioDestination to the hardware sam
ple-rate | 63 // blink::WebAudioDevice::RenderCallback |
58 virtual float sampleRate() const = 0; | 64 virtual void render(const blink::WebVector<float*>& sourceData, const blink:
:WebVector<float*>& audioData, size_t numberOfFrames); |
| 65 |
| 66 // WebCore::AudioSourceProvider |
| 67 virtual void provideInput(AudioBus*, size_t framesToProcess); |
| 68 |
59 static float hardwareSampleRate(); | 69 static float hardwareSampleRate(); |
60 | 70 |
61 // maxChannelCount() returns the total number of output channels of the audi
o hardware. | 71 // maxChannelCount() returns the total number of output channels of the audi
o hardware. |
62 // A value of 0 indicates that the number of channels cannot be configured a
nd | 72 // A value of 0 indicates that the number of channels cannot be configured a
nd |
63 // that only stereo (2-channel) destinations can be created. | 73 // that only stereo (2-channel) destinations can be created. |
64 // The numberOfOutputChannels parameter of AudioDestination::create() is all
owed to | 74 // The numberOfOutputChannels parameter of AudioDestination::create() is all
owed to |
65 // be a value: 1 <= numberOfOutputChannels <= maxChannelCount(), | 75 // be a value: 1 <= numberOfOutputChannels <= maxChannelCount(), |
66 // or if maxChannelCount() equals 0, then numberOfOutputChannels must be 2. | 76 // or if maxChannelCount() equals 0, then numberOfOutputChannels must be 2. |
67 static unsigned long maxChannelCount(); | 77 static unsigned long maxChannelCount(); |
| 78 |
| 79 private: |
| 80 AudioIOCallback& m_callback; |
| 81 unsigned m_numberOfOutputChannels; |
| 82 RefPtr<AudioBus> m_inputBus; |
| 83 RefPtr<AudioBus> m_renderBus; |
| 84 float m_sampleRate; |
| 85 bool m_isPlaying; |
| 86 OwnPtr<blink::WebAudioDevice> m_audioDevice; |
| 87 size_t m_callbackBufferSize; |
| 88 |
| 89 OwnPtr<AudioFIFO> m_inputFifo; |
| 90 OwnPtr<AudioPullFIFO> m_fifo; |
68 }; | 91 }; |
69 | 92 |
70 } // namespace WebCore | 93 } // namespace WebCore |
71 | 94 |
72 #endif // AudioDestination_h | 95 #endif // AudioDestination_h |
OLD | NEW |