1/*
2 * Copyright (C) 2010, Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
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.
12 *
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.
23 */
24
25#pragma once
26
27#include "AudioBus.h"
28#include "AudioIOCallback.h"
29#include "AudioNode.h"
30#include <wtf/Function.h>
31
32namespace WebCore {
33
34class AudioContext;
35
36class AudioDestinationNode : public AudioNode, public AudioIOCallback {
37 WTF_MAKE_ISO_ALLOCATED(AudioDestinationNode);
38public:
39 AudioDestinationNode(AudioContext&, float sampleRate);
40 virtual ~AudioDestinationNode();
41
42 // AudioNode
43 void process(size_t) override { }; // we're pulled by hardware so this is never called
44 void reset() override { m_currentSampleFrame = 0; }
45
46 // The audio hardware calls render() to get the next render quantum of audio into destinationBus.
47 // It will optionally give us local/live audio input in sourceBus (if it's not 0).
48 void render(AudioBus* sourceBus, AudioBus* destinationBus, size_t numberOfFrames) override;
49
50 size_t currentSampleFrame() const { return m_currentSampleFrame; }
51 double currentTime() const { return currentSampleFrame() / static_cast<double>(sampleRate()); }
52
53 virtual unsigned maxChannelCount() const { return 0; }
54
55 // Enable local/live input for the specified device.
56 virtual void enableInput(const String& inputDeviceId) = 0;
57
58 virtual void startRendering() = 0;
59 virtual void resume(WTF::Function<void ()>&&) { }
60 virtual void suspend(WTF::Function<void ()>&&) { }
61 virtual void close(WTF::Function<void ()>&&) { }
62
63 virtual bool isPlaying() { return false; }
64 void isPlayingDidChange() override;
65 bool isPlayingAudio() const { return m_isEffectivelyPlayingAudio; }
66 void setMuted(bool muted) { m_muted = muted; }
67
68protected:
69 double tailTime() const override { return 0; }
70 double latencyTime() const override { return 0; }
71
72 void setIsSilent(bool);
73 void updateIsEffectivelyPlayingAudio();
74
75 // Counts the number of sample-frames processed by the destination.
76 size_t m_currentSampleFrame;
77
78 bool m_isSilent;
79 bool m_isEffectivelyPlayingAudio;
80 bool m_muted;
81};
82
83} // namespace WebCore
84