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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 
     27 #if ENABLE(WEB_AUDIO)
     28 
     29 #include "core/platform/audio/AudioBus.h"
     30 
     31 #include "public/platform/Platform.h"
     32 #include "public/platform/WebAudioBus.h"
     33 
     34 namespace WebCore {
     35 
     36 PassRefPtr<AudioBus> decodeAudioFileData(const char* data, size_t size, double sampleRate)
     37 {
     38     WebKit::WebAudioBus webAudioBus;
     39     if (WebKit::Platform::current()->loadAudioResource(&webAudioBus, data, size, sampleRate))
     40         return webAudioBus.release();
     41     return 0;
     42 }
     43 
     44 PassRefPtr<AudioBus> AudioBus::loadPlatformResource(const char* name, float sampleRate)
     45 {
     46     const WebKit::WebData& resource = WebKit::Platform::current()->loadResource(name);
     47     if (resource.isEmpty())
     48         return 0;
     49 
     50     // FIXME: the sampleRate parameter is ignored. It should be removed from the API.
     51     RefPtr<AudioBus> audioBus = decodeAudioFileData(resource.data(), resource.size(), sampleRate);
     52 
     53     if (!audioBus.get())
     54         return 0;
     55 
     56     // If the bus is already at the requested sample-rate then return as is.
     57     if (audioBus->sampleRate() == sampleRate)
     58         return audioBus;
     59 
     60     return AudioBus::createBySampleRateConverting(audioBus.get(), false, sampleRate);
     61 }
     62 
     63 PassRefPtr<AudioBus> createBusFromInMemoryAudioFile(const void* data, size_t dataSize, bool mixToMono, float sampleRate)
     64 {
     65     // FIXME: the sampleRate parameter is ignored. It should be removed from the API.
     66     RefPtr<AudioBus> audioBus = decodeAudioFileData(static_cast<const char*>(data), dataSize, sampleRate);
     67     if (!audioBus.get())
     68         return 0;
     69 
     70     // If the bus needs no conversion then return as is.
     71     if ((!mixToMono || audioBus->numberOfChannels() == 1) && audioBus->sampleRate() == sampleRate)
     72         return audioBus;
     73 
     74     return AudioBus::createBySampleRateConverting(audioBus.get(), mixToMono, sampleRate);
     75 }
     76 
     77 } // namespace WebCore
     78 
     79 #endif // ENABLE(WEB_AUDIO)
     80