1/*
2 * Copyright (C) 2013 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 are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include "config.h"
32#include "modules/webmidi/MIDIAccess.h"
33
34#include "core/dom/Document.h"
35#include "core/loader/DocumentLoadTiming.h"
36#include "core/loader/DocumentLoader.h"
37#include "modules/webmidi/MIDIAccessInitializer.h"
38#include "modules/webmidi/MIDIConnectionEvent.h"
39#include "modules/webmidi/MIDIController.h"
40#include "modules/webmidi/MIDIInput.h"
41#include "modules/webmidi/MIDIInputMap.h"
42#include "modules/webmidi/MIDIOutput.h"
43#include "modules/webmidi/MIDIOutputMap.h"
44#include "modules/webmidi/MIDIPort.h"
45#include "platform/AsyncMethodRunner.h"
46#include <v8.h>
47
48namespace blink {
49
50MIDIAccess::MIDIAccess(PassOwnPtr<MIDIAccessor> accessor, bool sysexEnabled, const Vector<MIDIAccessInitializer::PortDescriptor>& ports, ExecutionContext* executionContext)
51    : ActiveDOMObject(executionContext)
52    , m_accessor(accessor)
53    , m_sysexEnabled(sysexEnabled)
54{
55    m_accessor->setClient(this);
56    for (size_t i = 0; i < ports.size(); ++i) {
57        const MIDIAccessInitializer::PortDescriptor& port = ports[i];
58        if (port.type == MIDIPort::MIDIPortTypeInput) {
59            m_inputs.append(MIDIInput::create(this, port.id, port.manufacturer, port.name, port.version));
60        } else {
61            m_outputs.append(MIDIOutput::create(this, m_outputs.size(), port.id, port.manufacturer, port.name, port.version));
62        }
63    }
64}
65
66MIDIAccess::~MIDIAccess()
67{
68}
69
70MIDIInputMap* MIDIAccess::inputs() const
71{
72    HeapHashMap<String, Member<MIDIInput> > inputs;
73    for (size_t i = 0; i < m_inputs.size(); ++i) {
74        MIDIInput* input = m_inputs[i];
75        inputs.add(input->id(), input);
76    }
77    if (inputs.size() != m_inputs.size()) {
78        // There is id duplication that violates the spec.
79        inputs.clear();
80    }
81    return new MIDIInputMap(inputs);
82}
83
84MIDIOutputMap* MIDIAccess::outputs() const
85{
86    HeapHashMap<String, Member<MIDIOutput> > outputs;
87    for (size_t i = 0; i < m_outputs.size(); ++i) {
88        MIDIOutput* output = m_outputs[i];
89        outputs.add(output->id(), output);
90    }
91    if (outputs.size() != m_outputs.size()) {
92        // There is id duplication that violates the spec.
93        outputs.clear();
94    }
95    return new MIDIOutputMap(outputs);
96}
97
98void MIDIAccess::didAddInputPort(const String& id, const String& manufacturer, const String& name, const String& version)
99{
100    ASSERT(isMainThread());
101    m_inputs.append(MIDIInput::create(this, id, manufacturer, name, version));
102}
103
104void MIDIAccess::didAddOutputPort(const String& id, const String& manufacturer, const String& name, const String& version)
105{
106    ASSERT(isMainThread());
107    unsigned portIndex = m_outputs.size();
108    m_outputs.append(MIDIOutput::create(this, portIndex, id, manufacturer, name, version));
109}
110
111void MIDIAccess::didReceiveMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStamp)
112{
113    ASSERT(isMainThread());
114    if (portIndex >= m_inputs.size())
115        return;
116
117    // Convert from time in seconds which is based on the time coordinate system of monotonicallyIncreasingTime()
118    // into time in milliseconds (a DOMHighResTimeStamp) according to the same time coordinate system as performance.now().
119    // This is how timestamps are defined in the Web MIDI spec.
120    Document* document = toDocument(executionContext());
121    ASSERT(document);
122
123    double timeStampInMilliseconds = 1000 * document->loader()->timing()->monotonicTimeToZeroBasedDocumentTime(timeStamp);
124
125    m_inputs[portIndex]->didReceiveMIDIData(portIndex, data, length, timeStampInMilliseconds);
126}
127
128void MIDIAccess::sendMIDIData(unsigned portIndex, const unsigned char* data, size_t length, double timeStampInMilliseconds)
129{
130    if (!data || !length || portIndex >= m_outputs.size())
131        return;
132    // Convert from a time in milliseconds (a DOMHighResTimeStamp) according to the same time coordinate system as performance.now()
133    // into a time in seconds which is based on the time coordinate system of monotonicallyIncreasingTime().
134    double timeStamp;
135
136    if (!timeStampInMilliseconds) {
137        // We treat a value of 0 (which is the default value) as special, meaning "now".
138        // We need to translate it exactly to 0 seconds.
139        timeStamp = 0;
140    } else {
141        Document* document = toDocument(executionContext());
142        ASSERT(document);
143        double documentStartTime = document->loader()->timing()->referenceMonotonicTime();
144        timeStamp = documentStartTime + 0.001 * timeStampInMilliseconds;
145    }
146
147    m_accessor->sendMIDIData(portIndex, data, length, timeStamp);
148}
149
150void MIDIAccess::stop()
151{
152    m_accessor.clear();
153}
154
155void MIDIAccess::trace(Visitor* visitor)
156{
157    visitor->trace(m_inputs);
158    visitor->trace(m_outputs);
159    EventTargetWithInlineData::trace(visitor);
160}
161
162} // namespace blink
163