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 "platform/audio/AudioFileReader.h"
30
31 #include "platform/audio/AudioBus.h"
32 #include "public/platform/Platform.h"
33 #include "public/platform/WebAudioBus.h"
34
35 namespace WebCore {
36
decodeAudioFileData(const char * data,size_t size,double sampleRate)37 PassRefPtr<AudioBus> decodeAudioFileData(const char* data, size_t size, double sampleRate)
38 {
39 blink::WebAudioBus webAudioBus;
40 if (blink::Platform::current()->loadAudioResource(&webAudioBus, data, size, sampleRate))
41 return webAudioBus.release();
42 return 0;
43 }
44
loadPlatformResource(const char * name,float sampleRate)45 PassRefPtr<AudioBus> AudioBus::loadPlatformResource(const char* name, float sampleRate)
46 {
47 const blink::WebData& resource = blink::Platform::current()->loadResource(name);
48 if (resource.isEmpty())
49 return 0;
50
51 // FIXME: the sampleRate parameter is ignored. It should be removed from the API.
52 RefPtr<AudioBus> audioBus = decodeAudioFileData(resource.data(), resource.size(), sampleRate);
53
54 if (!audioBus.get())
55 return 0;
56
57 // If the bus is already at the requested sample-rate then return as is.
58 if (audioBus->sampleRate() == sampleRate)
59 return audioBus;
60
61 return AudioBus::createBySampleRateConverting(audioBus.get(), false, sampleRate);
62 }
63
createBusFromInMemoryAudioFile(const void * data,size_t dataSize,bool mixToMono,float sampleRate)64 PassRefPtr<AudioBus> createBusFromInMemoryAudioFile(const void* data, size_t dataSize, bool mixToMono, float sampleRate)
65 {
66 // FIXME: the sampleRate parameter is ignored. It should be removed from the API.
67 RefPtr<AudioBus> audioBus = decodeAudioFileData(static_cast<const char*>(data), dataSize, sampleRate);
68 if (!audioBus.get())
69 return 0;
70
71 // If the bus needs no conversion then return as is.
72 if ((!mixToMono || audioBus->numberOfChannels() == 1) && audioBus->sampleRate() == sampleRate)
73 return audioBus;
74
75 return AudioBus::createBySampleRateConverting(audioBus.get(), mixToMono, sampleRate);
76 }
77
78 } // namespace WebCore
79
80 #endif // ENABLE(WEB_AUDIO)
81