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
38using namespace JSC;
39
40namespace WebCore {
41
42EncodedJSValue 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
81JSValue 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