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      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 "WebAudioBus.h"
     27 
     28 #if ENABLE(WEB_AUDIO)
     29 #include "AudioBus.h"
     30 #else
     31 namespace WebCore {
     32 class AudioBus {
     33 };
     34 } // namespace WebCore
     35 #endif
     36 
     37 #include <wtf/OwnPtr.h>
     38 #include <wtf/PassOwnPtr.h>
     39 
     40 using namespace WebCore;
     41 
     42 namespace WebKit {
     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     AudioBus* audioBus = new AudioBus(numberOfChannels, length);
     51     audioBus->setSampleRate(sampleRate);
     52 
     53     if (m_private)
     54         delete m_private;
     55     m_private = static_cast<WebAudioBusPrivate*>(audioBus);
     56 #else
     57     ASSERT_NOT_REACHED();
     58 #endif
     59 }
     60 
     61 void WebAudioBus::reset()
     62 {
     63 #if ENABLE(WEB_AUDIO)
     64     delete m_private;
     65     m_private = 0;
     66 #else
     67     ASSERT_NOT_REACHED();
     68 #endif
     69 }
     70 
     71 unsigned WebAudioBus::numberOfChannels() const
     72 {
     73 #if ENABLE(WEB_AUDIO)
     74     if (!m_private)
     75         return 0;
     76     return m_private->numberOfChannels();
     77 #else
     78     ASSERT_NOT_REACHED();
     79     return 0;
     80 #endif
     81 }
     82 
     83 size_t WebAudioBus::length() const
     84 {
     85 #if ENABLE(WEB_AUDIO)
     86     if (!m_private)
     87         return 0;
     88     return m_private->length();
     89 #else
     90     ASSERT_NOT_REACHED();
     91     return 0;
     92 #endif
     93 }
     94 
     95 double WebAudioBus::sampleRate() const
     96 {
     97 #if ENABLE(WEB_AUDIO)
     98     if (!m_private)
     99         return 0;
    100     return m_private->sampleRate();
    101 #else
    102     ASSERT_NOT_REACHED();
    103     return 0;
    104 #endif
    105 }
    106 
    107 float* WebAudioBus::channelData(unsigned channelIndex)
    108 {
    109 #if ENABLE(WEB_AUDIO)
    110     if (!m_private)
    111         return 0;
    112     ASSERT(channelIndex < numberOfChannels());
    113     return m_private->channel(channelIndex)->data();
    114 #else
    115     ASSERT_NOT_REACHED();
    116     return 0;
    117 #endif
    118 }
    119 
    120 PassOwnPtr<AudioBus> WebAudioBus::release()
    121 {
    122 #if ENABLE(WEB_AUDIO)
    123     OwnPtr<AudioBus> audioBus(adoptPtr(static_cast<AudioBus*>(m_private)));
    124     m_private = 0;
    125     return audioBus.release();
    126 #else
    127     ASSERT_NOT_REACHED();
    128     return 0;
    129 #endif
    130 }
    131 
    132 } // namespace WebKit
    133