third_party/WebKit/Source/platform/exported/WebAudioBus.cpp

   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 #include "config.h"
  26 #include "public/platform/WebAudioBus.h"
  27
  28 #if ENABLE(WEB_AUDIO)
  29 #include "platform/audio/AudioBus.h"
  30 #else
  31 #include "wtf/ThreadSafeRefCounted.h"
  32
  33 namespace blink {
  34 class AudioBus : public ThreadSafeRefCounted<AudioBus> {
  35 };
  36 } // namespace blink
  37 #endif
  38
  39 #include "wtf/PassRefPtr.h"
  40 #include "wtf/RefPtr.h"
  41
  42 namespace blink {
  43
  44 class WebAudioBusPrivate : public AudioBus {
  45 };
  46
  47 void WebAudioBus::initialize(unsigned numberOfChannels, size_t length, double sampleRate)
  48 {
  49 #if ENABLE(WEB_AUDIO)
  50     RefPtr<AudioBus> audioBus = AudioBus::create(numberOfChannels, length);
  51     audioBus->setSampleRate(sampleRate);
  52
  53     if (m_private)
  54         (static_cast<AudioBus*>(m_private))->deref();
  55
  56     audioBus->ref();
  57     m_private = static_cast<WebAudioBusPrivate*>(audioBus.get());
  58 #else
  59     ASSERT_NOT_REACHED();
  60 #endif
  61 }
  62
  63 void WebAudioBus::resizeSmaller(size_t newLength)
  64 {
  65 #if ENABLE(WEB_AUDIO)
  66     ASSERT(m_private);
  67     if (m_private) {
  68         ASSERT(newLength <= length());
  69         m_private->resizeSmaller(newLength);
  70     }
  71 #else
  72     ASSERT_NOT_REACHED();
  73 #endif
  74 }
  75
  76 void WebAudioBus::reset()
  77 {
  78 #if ENABLE(WEB_AUDIO)
  79     if (m_private) {
  80         (static_cast<AudioBus*>(m_private))->deref();
  81         m_private = 0;
  82     }
  83 #else
  84     ASSERT_NOT_REACHED();
  85 #endif
  86 }
  87
  88 unsigned WebAudioBus::numberOfChannels() const
  89 {
  90 #if ENABLE(WEB_AUDIO)
  91     if (!m_private)
  92         return 0;
  93     return m_private->numberOfChannels();
  94 #else
  95     ASSERT_NOT_REACHED();
  96     return 0;
  97 #endif
  98 }
  99
 100 size_t WebAudioBus::length() const
 101 {
 102 #if ENABLE(WEB_AUDIO)
 103     if (!m_private)
 104         return 0;
 105     return m_private->length();
 106 #else
 107     ASSERT_NOT_REACHED();
 108     return 0;
 109 #endif
 110 }
 111
 112 double WebAudioBus::sampleRate() const
 113 {
 114 #if ENABLE(WEB_AUDIO)
 115     if (!m_private)
 116         return 0;
 117     return m_private->sampleRate();
 118 #else
 119     ASSERT_NOT_REACHED();
 120     return 0;
 121 #endif
 122 }
 123
 124 float* WebAudioBus::channelData(unsigned channelIndex)
 125 {
 126 #if ENABLE(WEB_AUDIO)
 127     if (!m_private)
 128         return 0;
 129     ASSERT(channelIndex < numberOfChannels());
 130     return m_private->channel(channelIndex)->mutableData();
 131 #else
 132     ASSERT_NOT_REACHED();
 133     return 0;
 134 #endif
 135 }
 136
 137 PassRefPtr<AudioBus> WebAudioBus::release()
 138 {
 139 #if ENABLE(WEB_AUDIO)
 140     RefPtr<AudioBus> audioBus(adoptRef(static_cast<AudioBus*>(m_private)));
 141     m_private = 0;
 142     return audioBus;
 143 #else
 144     ASSERT_NOT_REACHED();
 145     return nullptr;
 146 #endif
 147 }
 148
 149 } // namespace blink