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 "AudioContext.h"
30
31 #include "ArrayBuffer.h"
32 #include "AudioBuffer.h"
33 #include "JSArrayBuffer.h"
34 #include "JSAudioBuffer.h"
35 #include "JSAudioContext.h"
36 #include <runtime/Error.h>
37
38 using namespace JSC;
39
40 namespace WebCore {
41
visitChildren(SlotVisitor & visitor)42 void JSAudioContext::visitChildren(SlotVisitor& visitor)
43 {
44 Base::visitChildren(visitor);
45 m_impl->visitJSEventListeners(visitor);
46 }
47
constructJSAudioContext(ExecState * exec)48 EncodedJSValue JSC_HOST_CALL JSAudioContextConstructor::constructJSAudioContext(ExecState* exec)
49 {
50 JSAudioContextConstructor* jsConstructor = static_cast<JSAudioContextConstructor*>(exec->callee());
51 if (!jsConstructor)
52 return throwError(exec, createReferenceError(exec, "AudioContext constructor callee is unavailable"));
53
54 ScriptExecutionContext* scriptExecutionContext = jsConstructor->scriptExecutionContext();
55 if (!scriptExecutionContext)
56 return throwError(exec, createReferenceError(exec, "AudioContext constructor script execution context is unavailable"));
57
58 if (!scriptExecutionContext->isDocument())
59 return throwError(exec, createReferenceError(exec, "AudioContext constructor called in a script execution context which is not a document"));
60
61 Document* document = static_cast<Document*>(scriptExecutionContext);
62
63 RefPtr<AudioContext> audioContext;
64
65 if (!exec->argumentCount()) {
66 // Constructor for default AudioContext which talks to audio hardware.
67 audioContext = AudioContext::create(document);
68 } else {
69 // Constructor for offline (render-target) AudioContext which renders into an AudioBuffer.
70 // new AudioContext(in unsigned long numberOfChannels, in unsigned long numberOfFrames, in float sampleRate);
71 if (exec->argumentCount() < 3)
72 return throwError(exec, createSyntaxError(exec, "Not enough arguments"));
73
74 unsigned numberOfChannels = exec->argument(0).toInt32(exec);
75 unsigned numberOfFrames = exec->argument(1).toInt32(exec);
76 float sampleRate = exec->argument(2).toFloat(exec);
77
78 audioContext = AudioContext::createOfflineContext(document, numberOfChannels, numberOfFrames, sampleRate);
79 }
80
81 if (!audioContext.get())
82 return throwError(exec, createReferenceError(exec, "Error creating AudioContext"));
83
84 return JSValue::encode(asObject(toJS(exec, jsConstructor->globalObject(), audioContext.get())));
85 }
86
createBuffer(ExecState * exec)87 JSValue JSAudioContext::createBuffer(ExecState* exec)
88 {
89 if (exec->argumentCount() < 2)
90 return throwError(exec, createSyntaxError(exec, "Not enough arguments"));
91
92 AudioContext* audioContext = static_cast<AudioContext*>(impl());
93 ASSERT(audioContext);
94
95 // AudioBuffer createBuffer(in ArrayBuffer buffer, in boolean mixToMono);
96 JSValue val = exec->argument(0);
97 if (val.inherits(&JSArrayBuffer::s_info)) {
98 ArrayBuffer* arrayBuffer = toArrayBuffer(val);
99 ASSERT(arrayBuffer);
100 if (arrayBuffer) {
101 bool mixToMono = exec->argument(1).toBoolean(exec);
102
103 RefPtr<AudioBuffer> audioBuffer = audioContext->createBuffer(arrayBuffer, mixToMono);
104 if (!audioBuffer.get())
105 return throwError(exec, createSyntaxError(exec, "Error decoding audio file data"));
106
107 return toJS(exec, globalObject(), audioBuffer.get());
108 }
109
110 return jsUndefined();
111 }
112
113 // AudioBuffer createBuffer(in unsigned long numberOfChannels, in unsigned long numberOfFrames, in float sampleRate);
114 if (exec->argumentCount() < 3)
115 return throwError(exec, createSyntaxError(exec, "Not enough arguments"));
116
117 unsigned numberOfChannels = exec->argument(0).toInt32(exec);
118 unsigned numberOfFrames = exec->argument(1).toInt32(exec);
119 float sampleRate = exec->argument(2).toFloat(exec);
120
121 RefPtr<AudioBuffer> audioBuffer = audioContext->createBuffer(numberOfChannels, numberOfFrames, sampleRate);
122 if (!audioBuffer.get())
123 return throwError(exec, createSyntaxError(exec, "Error creating AudioBuffer"));
124
125 return toJS(exec, globalObject(), audioBuffer.get());
126 }
127
128 } // namespace WebCore
129
130 #endif // ENABLE(WEB_AUDIO)
131