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1 /* | 1 /* |
2 * Copyright (C) 2010, Google Inc. All rights reserved. | 2 * Copyright (C) 2010, 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 | 5 * modification, are permitted provided that the following conditions |
6 * are met: | 6 * are met: |
7 * 1. Redistributions of source code must retain the above copyright | 7 * 1. Redistributions of source code must retain the above copyright |
8 * notice, this list of conditions and the following disclaimer. | 8 * notice, this list of conditions and the following disclaimer. |
9 * 2. Redistributions in binary form must reproduce the above copyright | 9 * 2. Redistributions in binary form must reproduce the above copyright |
10 * notice, this list of conditions and the following disclaimer in the | 10 * notice, this list of conditions and the following disclaimer in the |
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203 if (desiredAzimuthIndex != m_azimuthIndex2 || elevation != m_elevation2) { | 203 if (desiredAzimuthIndex != m_azimuthIndex2 || elevation != m_elevation2) { |
204 // Cross-fade from 2 -> 1 | 204 // Cross-fade from 2 -> 1 |
205 m_crossfadeIncr = -1 / fadeFrames; | 205 m_crossfadeIncr = -1 / fadeFrames; |
206 m_azimuthIndex1 = desiredAzimuthIndex; | 206 m_azimuthIndex1 = desiredAzimuthIndex; |
207 m_elevation1 = elevation; | 207 m_elevation1 = elevation; |
208 } | 208 } |
209 } | 209 } |
210 | 210 |
211 // This algorithm currently requires that we process in power-of-two size | 211 // This algorithm currently requires that we process in power-of-two size |
212 // chunks at least AudioUtilities::kRenderQuantumFrames. | 212 // chunks at least AudioUtilities::kRenderQuantumFrames. |
213 ASSERT(1UL << static_cast<int>(log2(framesToProcess)) == framesToProcess); | 213 DCHECK_EQ(1UL << static_cast<int>(log2(framesToProcess)), framesToProcess); |
214 DCHECK_GE(framesToProcess, AudioUtilities::kRenderQuantumFrames); | 214 DCHECK_GE(framesToProcess, AudioUtilities::kRenderQuantumFrames); |
215 | 215 |
216 const unsigned framesPerSegment = AudioUtilities::kRenderQuantumFrames; | 216 const unsigned framesPerSegment = AudioUtilities::kRenderQuantumFrames; |
217 const unsigned numberOfSegments = framesToProcess / framesPerSegment; | 217 const unsigned numberOfSegments = framesToProcess / framesPerSegment; |
218 | 218 |
219 for (unsigned segment = 0; segment < numberOfSegments; ++segment) { | 219 for (unsigned segment = 0; segment < numberOfSegments; ++segment) { |
220 // Get the HRTFKernels and interpolated delays. | 220 // Get the HRTFKernels and interpolated delays. |
221 HRTFKernel* kernelL1; | 221 HRTFKernel* kernelL1; |
222 HRTFKernel* kernelR1; | 222 HRTFKernel* kernelR1; |
223 HRTFKernel* kernelL2; | 223 HRTFKernel* kernelL2; |
224 HRTFKernel* kernelR2; | 224 HRTFKernel* kernelR2; |
225 double frameDelayL1; | 225 double frameDelayL1; |
226 double frameDelayR1; | 226 double frameDelayR1; |
227 double frameDelayL2; | 227 double frameDelayL2; |
228 double frameDelayR2; | 228 double frameDelayR2; |
229 database->getKernelsFromAzimuthElevation(azimuthBlend, m_azimuthIndex1, | 229 database->getKernelsFromAzimuthElevation(azimuthBlend, m_azimuthIndex1, |
230 m_elevation1, kernelL1, kernelR1, | 230 m_elevation1, kernelL1, kernelR1, |
231 frameDelayL1, frameDelayR1); | 231 frameDelayL1, frameDelayR1); |
232 database->getKernelsFromAzimuthElevation(azimuthBlend, m_azimuthIndex2, | 232 database->getKernelsFromAzimuthElevation(azimuthBlend, m_azimuthIndex2, |
233 m_elevation2, kernelL2, kernelR2, | 233 m_elevation2, kernelL2, kernelR2, |
234 frameDelayL2, frameDelayR2); | 234 frameDelayL2, frameDelayR2); |
235 | 235 |
236 bool areKernelsGood = kernelL1 && kernelR1 && kernelL2 && kernelR2; | 236 bool areKernelsGood = kernelL1 && kernelR1 && kernelL2 && kernelR2; |
237 DCHECK(areKernelsGood); | 237 DCHECK(areKernelsGood); |
238 if (!areKernelsGood) { | 238 if (!areKernelsGood) { |
239 outputBus->zero(); | 239 outputBus->zero(); |
240 return; | 240 return; |
241 } | 241 } |
242 | 242 |
243 ASSERT(frameDelayL1 / sampleRate() < MaxDelayTimeSeconds && | 243 DCHECK_LT(frameDelayL1 / sampleRate(), MaxDelayTimeSeconds); |
244 frameDelayR1 / sampleRate() < MaxDelayTimeSeconds); | 244 DCHECK_LT(frameDelayR1 / sampleRate(), MaxDelayTimeSeconds); |
245 ASSERT(frameDelayL2 / sampleRate() < MaxDelayTimeSeconds && | 245 DCHECK_LT(frameDelayL2 / sampleRate(), MaxDelayTimeSeconds); |
246 frameDelayR2 / sampleRate() < MaxDelayTimeSeconds); | 246 DCHECK_LT(frameDelayR2 / sampleRate(), MaxDelayTimeSeconds); |
247 | 247 |
248 // Crossfade inter-aural delays based on transitions. | 248 // Crossfade inter-aural delays based on transitions. |
249 double frameDelayL = | 249 double frameDelayL = |
250 (1 - m_crossfadeX) * frameDelayL1 + m_crossfadeX * frameDelayL2; | 250 (1 - m_crossfadeX) * frameDelayL1 + m_crossfadeX * frameDelayL2; |
251 double frameDelayR = | 251 double frameDelayR = |
252 (1 - m_crossfadeX) * frameDelayR1 + m_crossfadeX * frameDelayR2; | 252 (1 - m_crossfadeX) * frameDelayR1 + m_crossfadeX * frameDelayR2; |
253 | 253 |
254 // Calculate the source and destination pointers for the current segment. | 254 // Calculate the source and destination pointers for the current segment. |
255 unsigned offset = segment * framesPerSegment; | 255 unsigned offset = segment * framesPerSegment; |
256 const float* segmentSourceL = sourceL + offset; | 256 const float* segmentSourceL = sourceL + offset; |
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353 (fftSize() / 2) / static_cast<double>(sampleRate()); | 353 (fftSize() / 2) / static_cast<double>(sampleRate()); |
354 } | 354 } |
355 | 355 |
356 double HRTFPanner::latencyTime() const { | 356 double HRTFPanner::latencyTime() const { |
357 // The latency of a FFTConvolver is also fftSize() / 2, and is in addition to | 357 // The latency of a FFTConvolver is also fftSize() / 2, and is in addition to |
358 // its tailTime of the same value. | 358 // its tailTime of the same value. |
359 return (fftSize() / 2) / static_cast<double>(sampleRate()); | 359 return (fftSize() / 2) / static_cast<double>(sampleRate()); |
360 } | 360 } |
361 | 361 |
362 } // namespace blink | 362 } // namespace blink |
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