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