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 "AudioBus.h"
30
31 #include "AudioFileReader.h"
32 #include "PlatformBridge.h"
33 #include <wtf/PassOwnPtr.h>
34
35 namespace WebCore {
36
loadPlatformResource(const char * name,double sampleRate)37 PassOwnPtr<AudioBus> AudioBus::loadPlatformResource(const char* name, double sampleRate)
38 {
39 // FIXME: the sampleRate parameter is ignored. It should be removed from the API.
40 OwnPtr<AudioBus> audioBus = PlatformBridge::loadPlatformAudioResource(name, sampleRate);
41 if (!audioBus.get())
42 return 0;
43
44 // If the bus is already at the requested sample-rate then return as is.
45 if (audioBus->sampleRate() == sampleRate)
46 return audioBus.release();
47
48 return AudioBus::createBySampleRateConverting(audioBus.get(), false, sampleRate);
49 }
50
createBusFromInMemoryAudioFile(const void * data,size_t dataSize,bool mixToMono,double sampleRate)51 PassOwnPtr<AudioBus> createBusFromInMemoryAudioFile(const void* data, size_t dataSize, bool mixToMono, double sampleRate)
52 {
53 // FIXME: the sampleRate parameter is ignored. It should be removed from the API.
54 OwnPtr<AudioBus> audioBus = PlatformBridge::decodeAudioFileData(static_cast<const char*>(data), dataSize, sampleRate);
55 if (!audioBus.get())
56 return 0;
57
58 // If the bus needs no conversion then return as is.
59 if ((!mixToMono || audioBus->numberOfChannels() == 1) && audioBus->sampleRate() == sampleRate)
60 return audioBus.release();
61
62 return AudioBus::createBySampleRateConverting(audioBus.get(), mixToMono, sampleRate);
63 }
64
65 } // namespace WebCore
66
67 #endif // ENABLE(WEB_AUDIO)
68