2 * Copyright (C) 2010, Google Inc. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
15 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16 * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
17 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
22 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 #ifndef AudioDestinationNode_h
26 #define AudioDestinationNode_h
28 #include "AudioBuffer.h"
30 #include "AudioIOCallback.h"
31 #include "AudioNode.h"
32 #include "AudioSourceProvider.h"
33 #if ENABLE(TIZEN_WEB_AUDIO)
34 #include "ExceptionCode.h"
42 class AudioDestinationNode : public AudioNode, public AudioIOCallback {
44 AudioDestinationNode(AudioContext*, float sampleRate);
45 virtual ~AudioDestinationNode();
48 virtual void process(size_t) { }; // we're pulled by hardware so this is never called
49 virtual void reset() { m_currentSampleFrame = 0; };
51 // The audio hardware calls render() to get the next render quantum of audio into destinationBus.
52 // It will optionally give us local/live audio input in sourceBus (if it's not 0).
53 virtual void render(AudioBus* sourceBus, AudioBus* destinationBus, size_t numberOfFrames);
55 size_t currentSampleFrame() const { return m_currentSampleFrame; }
56 double currentTime() const { return currentSampleFrame() / static_cast<double>(sampleRate()); }
58 #if ENABLE(TIZEN_WEB_AUDIO)
59 virtual unsigned long maxNumberOfChannels() const { return 2; } // FIXME: update when multi-channel (more than stereo) is supported
61 //Number of channels supported by AudioDestinationNode.
62 unsigned long numberOfChannels();
63 void setNumberOfChannels(unsigned long channels, ExceptionCode&);
65 virtual unsigned numberOfChannels() const { return 2; } // FIXME: update when multi-channel (more than stereo) is supported
68 virtual void enableInput() = 0;
69 virtual void startRendering() = 0;
70 #if ENABLE(TIZEN_WEB_AUDIO)
71 virtual void pauseRendering() = 0;
74 AudioSourceProvider* localAudioInputProvider() { return &m_localAudioInputProvider; }
77 // LocalAudioInputProvider allows us to expose an AudioSourceProvider for local/live audio input.
78 // If there is local/live audio input, we call set() with the audio input data every render quantum.
79 class LocalAudioInputProvider : public AudioSourceProvider {
81 LocalAudioInputProvider()
82 : m_sourceBus(2, AudioNode::ProcessingSizeInFrames) // FIXME: handle non-stereo local input.
86 void set(AudioBus* bus)
89 m_sourceBus.copyFrom(*bus);
92 // AudioSourceProvider.
93 virtual void provideInput(AudioBus* destinationBus, size_t numberOfFrames)
95 bool isGood = destinationBus && destinationBus->length() == numberOfFrames && m_sourceBus.length() == numberOfFrames;
98 destinationBus->copyFrom(m_sourceBus);
102 AudioBus m_sourceBus;
105 virtual double tailTime() const OVERRIDE { return 0; }
106 virtual double latencyTime() const OVERRIDE { return 0; }
108 // Counts the number of sample-frames processed by the destination.
109 size_t m_currentSampleFrame;
111 LocalAudioInputProvider m_localAudioInputProvider;
113 #if ENABLE(TIZEN_WEB_AUDIO)
114 //Number of channels supported.
115 unsigned long m_channelCount;
119 } // namespace WebCore
121 #endif // AudioDestinationNode_h