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1 /* | 1 /* |
2 * Copyright (C) 2013 Google Inc. All rights reserved. | 2 * Copyright (C) 2013 Google Inc. All rights reserved. |
3 * | 3 * |
4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
5 * modification, are permitted provided that the following conditions are | 5 * modification, are permitted provided that the following conditions are |
6 * met: | 6 * met: |
7 * | 7 * |
8 * * Redistributions of source code must retain the above copyright | 8 * * Redistributions of source code must retain the above copyright |
9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
10 * * Redistributions in binary form must reproduce the above | 10 * * Redistributions in binary form must reproduce the above |
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168 } | 168 } |
169 | 169 |
170 void MIDIAccess::didReceiveMIDIData(unsigned portIndex, | 170 void MIDIAccess::didReceiveMIDIData(unsigned portIndex, |
171 const unsigned char* data, | 171 const unsigned char* data, |
172 size_t length, | 172 size_t length, |
173 double timeStamp) { | 173 double timeStamp) { |
174 DCHECK(isMainThread()); | 174 DCHECK(isMainThread()); |
175 if (portIndex >= m_inputs.size()) | 175 if (portIndex >= m_inputs.size()) |
176 return; | 176 return; |
177 | 177 |
178 // Convert from time in seconds which is based on the time coordinate system o
f monotonicallyIncreasingTime() | 178 // Convert from time in seconds which is based on the time coordinate system |
179 // into time in milliseconds (a DOMHighResTimeStamp) according to the same tim
e coordinate system as performance.now(). | 179 // of monotonicallyIncreasingTime() into time in milliseconds (a |
180 // This is how timestamps are defined in the Web MIDI spec. | 180 // DOMHighResTimeStamp) according to the same time coordinate system as |
| 181 // performance.now(). This is how timestamps are defined in the Web MIDI |
| 182 // spec. |
181 Document* document = toDocument(getExecutionContext()); | 183 Document* document = toDocument(getExecutionContext()); |
182 DCHECK(document); | 184 DCHECK(document); |
183 | 185 |
184 double timeStampInMilliseconds = | 186 double timeStampInMilliseconds = |
185 1000 * | 187 1000 * |
186 document->loader()->timing().monotonicTimeToZeroBasedDocumentTime( | 188 document->loader()->timing().monotonicTimeToZeroBasedDocumentTime( |
187 timeStamp); | 189 timeStamp); |
188 | 190 |
189 m_inputs[portIndex]->didReceiveMIDIData(portIndex, data, length, | 191 m_inputs[portIndex]->didReceiveMIDIData(portIndex, data, length, |
190 timeStampInMilliseconds); | 192 timeStampInMilliseconds); |
191 } | 193 } |
192 | 194 |
193 void MIDIAccess::sendMIDIData(unsigned portIndex, | 195 void MIDIAccess::sendMIDIData(unsigned portIndex, |
194 const unsigned char* data, | 196 const unsigned char* data, |
195 size_t length, | 197 size_t length, |
196 double timeStampInMilliseconds) { | 198 double timeStampInMilliseconds) { |
197 if (!data || !length || portIndex >= m_outputs.size()) | 199 if (!data || !length || portIndex >= m_outputs.size()) |
198 return; | 200 return; |
199 // Convert from a time in milliseconds (a DOMHighResTimeStamp) according to th
e same time coordinate system as performance.now() | 201 // Convert from a time in milliseconds (a DOMHighResTimeStamp) according to |
200 // into a time in seconds which is based on the time coordinate system of mono
tonicallyIncreasingTime(). | 202 // the same time coordinate system as performance.now() into a time in seconds |
| 203 // which is based on the time coordinate system of |
| 204 // monotonicallyIncreasingTime(). |
201 double timeStamp; | 205 double timeStamp; |
202 | 206 |
203 if (!timeStampInMilliseconds) { | 207 if (!timeStampInMilliseconds) { |
204 // We treat a value of 0 (which is the default value) as special, meaning "n
ow". | 208 // We treat a value of 0 (which is the default value) as special, meaning |
205 // We need to translate it exactly to 0 seconds. | 209 // "now". We need to translate it exactly to 0 seconds. |
206 timeStamp = 0; | 210 timeStamp = 0; |
207 } else { | 211 } else { |
208 Document* document = toDocument(getExecutionContext()); | 212 Document* document = toDocument(getExecutionContext()); |
209 DCHECK(document); | 213 DCHECK(document); |
210 double documentStartTime = | 214 double documentStartTime = |
211 document->loader()->timing().referenceMonotonicTime(); | 215 document->loader()->timing().referenceMonotonicTime(); |
212 timeStamp = documentStartTime + 0.001 * timeStampInMilliseconds; | 216 timeStamp = documentStartTime + 0.001 * timeStampInMilliseconds; |
213 } | 217 } |
214 | 218 |
215 m_accessor->sendMIDIData(portIndex, data, length, timeStamp); | 219 m_accessor->sendMIDIData(portIndex, data, length, timeStamp); |
216 } | 220 } |
217 | 221 |
218 void MIDIAccess::stop() { | 222 void MIDIAccess::stop() { |
219 m_accessor.reset(); | 223 m_accessor.reset(); |
220 } | 224 } |
221 | 225 |
222 DEFINE_TRACE(MIDIAccess) { | 226 DEFINE_TRACE(MIDIAccess) { |
223 visitor->trace(m_inputs); | 227 visitor->trace(m_inputs); |
224 visitor->trace(m_outputs); | 228 visitor->trace(m_outputs); |
225 EventTargetWithInlineData::trace(visitor); | 229 EventTargetWithInlineData::trace(visitor); |
226 ActiveDOMObject::trace(visitor); | 230 ActiveDOMObject::trace(visitor); |
227 } | 231 } |
228 | 232 |
229 } // namespace blink | 233 } // namespace blink |
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