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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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