third_party/WebKit/Source/platform/mediastream/MediaStreamWebAudioSource.cpp

   1 /*
   2  * Copyright 2014 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  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer
  12  *    in the documentation and/or other materials provided with the
  13  *    distribution.
  14  * 3. Neither the name of Google Inc. nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this
  16  *    software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include "config.h"
  32 #if ENABLE(WEB_AUDIO)
  33 #include "platform/mediastream/MediaStreamWebAudioSource.h"
  34
  35 #include "platform/audio/AudioBus.h"
  36 #include "public/platform/WebAudioSourceProvider.h"
  37
  38 namespace blink {
  39
  40 MediaStreamWebAudioSource::MediaStreamWebAudioSource(PassOwnPtr<WebAudioSourceProvider> provider)
  41     : m_webAudioSourceProvider(provider)
  42 {
  43 }
  44
  45 MediaStreamWebAudioSource::~MediaStreamWebAudioSource()
  46 {
  47 }
  48
  49 void MediaStreamWebAudioSource::provideInput(AudioBus* bus, size_t framesToProcess)
  50 {
  51     ASSERT(bus);
  52     if (!bus)
  53         return;
  54
  55     if (!m_webAudioSourceProvider) {
  56         bus->zero();
  57         return;
  58     }
  59
  60     // Wrap the AudioBus channel data using WebVector.
  61     size_t n = bus->numberOfChannels();
  62     WebVector<float*> webAudioData(n);
  63     for (size_t i = 0; i < n; ++i)
  64         webAudioData[i] = bus->channel(i)->mutableData();
  65
  66     m_webAudioSourceProvider->provideInput(webAudioData, framesToProcess);
  67 }
  68
  69 } // namespace blink
  70
  71 #endif // ENABLE(WEB_AUDIO)