Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 338 insertions, 0 deletions

diff --git a/dom/media/webaudio/blink/HRTFElevation.cpp b/dom/media/webaudio/blink/HRTFElevation.cpp
new file mode 100644
index 0000000000..af4e520384
--- /dev/null
+++ b/dom/media/webaudio/blink/HRTFElevation.cpp
@@ -0,0 +1,338 @@
+/*
+ * Copyright (C) 2010 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1.  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2.  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "HRTFElevation.h"
+
+#include <speex/speex_resampler.h>
+#include "mozilla/PodOperations.h"
+#include "AudioSampleFormat.h"
+
+#include "IRC_Composite_C_R0195-incl.cpp"
+
+using namespace mozilla;
+
+namespace WebCore {
+
+const int elevationSpacing = irc_composite_c_r0195_elevation_interval;
+const int firstElevation = irc_composite_c_r0195_first_elevation;
+const int numberOfElevations = MOZ_ARRAY_LENGTH(irc_composite_c_r0195);
+
+const unsigned HRTFElevation::NumberOfTotalAzimuths = 360 / 15 * 8;
+
+const int rawSampleRate = irc_composite_c_r0195_sample_rate;
+
+// Number of frames in an individual impulse response.
+const size_t ResponseFrameSize = 256;
+
+size_t HRTFElevation::sizeOfIncludingThis(
+    mozilla::MallocSizeOf aMallocSizeOf) const {
+  size_t amount = aMallocSizeOf(this);
+
+  amount += m_kernelListL.ShallowSizeOfExcludingThis(aMallocSizeOf);
+  for (size_t i = 0; i < m_kernelListL.Length(); i++) {
+    amount += m_kernelListL[i]->sizeOfIncludingThis(aMallocSizeOf);
+  }
+
+  return amount;
+}
+
+size_t HRTFElevation::fftSizeForSampleRate(float sampleRate) {
+  // The IRCAM HRTF impulse responses were 512 sample-frames @44.1KHz,
+  // but these have been truncated to 256 samples.
+  // An FFT-size of twice impulse response size is used (for convolution).
+  // So for sample rates of 44.1KHz an FFT size of 512 is good.
+  // We double the FFT-size only for sample rates at least double this.
+  // If the FFT size is too large then the impulse response will be padded
+  // with zeros without the fade-out provided by HRTFKernel.
+  MOZ_ASSERT(sampleRate > 1.0 && sampleRate < 1048576.0);
+
+  // This is the size if we were to use all raw response samples.
+  unsigned resampledLength =
+      floorf(ResponseFrameSize * sampleRate / rawSampleRate);
+  // Keep things semi-sane, with max FFT size of 1024.
+  unsigned size = std::min(resampledLength, 1023U);
+  // Ensure a minimum of 2 * WEBAUDIO_BLOCK_SIZE (with the size++ below) for
+  // FFTConvolver and set the 8 least significant bits for rounding up to
+  // the next power of 2 below.
+  size |= 2 * WEBAUDIO_BLOCK_SIZE - 1;
+  // Round up to the next power of 2, making the FFT size no more than twice
+  // the impulse response length.  This doubles size for values that are
+  // already powers of 2.  This works by filling in alls bit to right of the
+  // most significant bit.  The most significant bit is no greater than
+  // 1 << 9, and the least significant 8 bits were already set above, so
+  // there is at most one bit to add.
+  size |= (size >> 1);
+  size++;
+  MOZ_ASSERT((size & (size - 1)) == 0);
+
+  return size;
+}
+
+nsReturnRef<HRTFKernel> HRTFElevation::calculateKernelForAzimuthElevation(
+    int azimuth, int elevation, SpeexResamplerState* resampler,
+    float sampleRate) {
+  int elevationIndex = (elevation - firstElevation) / elevationSpacing;
+  MOZ_ASSERT(elevationIndex >= 0 && elevationIndex <= numberOfElevations);
+
+  int numberOfAzimuths = irc_composite_c_r0195[elevationIndex].count;
+  int azimuthSpacing = 360 / numberOfAzimuths;
+  MOZ_ASSERT(numberOfAzimuths * azimuthSpacing == 360);
+
+  int azimuthIndex = azimuth / azimuthSpacing;
+  MOZ_ASSERT(azimuthIndex * azimuthSpacing == azimuth);
+
+  const int16_t(&impulse_response_data)[ResponseFrameSize] =
+      irc_composite_c_r0195[elevationIndex].azimuths[azimuthIndex];
+
+  // When libspeex_resampler is compiled with FIXED_POINT, samples in
+  // speex_resampler_process_float are rounded directly to int16_t, which
+  // only works well if the floats are in the range +/-32767.  On such
+  // platforms it's better to resample before converting to float anyway.
+#ifdef MOZ_SAMPLE_TYPE_S16
+#  define RESAMPLER_PROCESS speex_resampler_process_int
+  const int16_t* response = impulse_response_data;
+  const int16_t* resampledResponse;
+#else
+#  define RESAMPLER_PROCESS speex_resampler_process_float
+  float response[ResponseFrameSize];
+  ConvertAudioSamples(impulse_response_data, response, ResponseFrameSize);
+  float* resampledResponse;
+#endif
+
+  // Note that depending on the fftSize returned by the panner, we may be
+  // truncating the impulse response.
+  const size_t resampledResponseLength = fftSizeForSampleRate(sampleRate) / 2;
+
+  AutoTArray<AudioDataValue, 2 * ResponseFrameSize> resampled;
+  if (sampleRate == rawSampleRate) {
+    resampledResponse = response;
+    MOZ_ASSERT(resampledResponseLength == ResponseFrameSize);
+  } else {
+    resampled.SetLength(resampledResponseLength);
+    resampledResponse = resampled.Elements();
+    speex_resampler_skip_zeros(resampler);
+
+    // Feed the input buffer into the resampler.
+    spx_uint32_t in_len = ResponseFrameSize;
+    spx_uint32_t out_len = resampled.Length();
+    RESAMPLER_PROCESS(resampler, 0, response, &in_len, resampled.Elements(),
+                      &out_len);
+
+    if (out_len < resampled.Length()) {
+      // The input should have all been processed.
+      MOZ_ASSERT(in_len == ResponseFrameSize);
+      // Feed in zeros get the data remaining in the resampler.
+      spx_uint32_t out_index = out_len;
+      in_len = speex_resampler_get_input_latency(resampler);
+      out_len = resampled.Length() - out_index;
+      RESAMPLER_PROCESS(resampler, 0, nullptr, &in_len,
+                        resampled.Elements() + out_index, &out_len);
+      out_index += out_len;
+      // There may be some uninitialized samples remaining for very low
+      // sample rates.
+      PodZero(resampled.Elements() + out_index, resampled.Length() - out_index);
+    }
+
+    speex_resampler_reset_mem(resampler);
+  }
+
+#ifdef MOZ_SAMPLE_TYPE_S16
+  AutoTArray<float, 2 * ResponseFrameSize> floatArray;
+  floatArray.SetLength(resampledResponseLength);
+  float* floatResponse = floatArray.Elements();
+  ConvertAudioSamples(resampledResponse, floatResponse,
+                      resampledResponseLength);
+#else
+  float* floatResponse = resampledResponse;
+#endif
+#undef RESAMPLER_PROCESS
+
+  return HRTFKernel::create(floatResponse, resampledResponseLength, sampleRate);
+}
+
+// The range of elevations for the IRCAM impulse responses varies depending on
+// azimuth, but the minimum elevation appears to always be -45.
+//
+// Here's how it goes:
+static int maxElevations[] = {
+    //  Azimuth
+    //
+    90,  // 0
+    45,  // 15
+    60,  // 30
+    45,  // 45
+    75,  // 60
+    45,  // 75
+    60,  // 90
+    45,  // 105
+    75,  // 120
+    45,  // 135
+    60,  // 150
+    45,  // 165
+    75,  // 180
+    45,  // 195
+    60,  // 210
+    45,  // 225
+    75,  // 240
+    45,  // 255
+    60,  // 270
+    45,  // 285
+    75,  // 300
+    45,  // 315
+    60,  // 330
+    45   //  345
+};
+
+nsReturnRef<HRTFElevation> HRTFElevation::createBuiltin(int elevation,
+                                                        float sampleRate) {
+  if (elevation < firstElevation ||
+      elevation > firstElevation + numberOfElevations * elevationSpacing ||
+      (elevation / elevationSpacing) * elevationSpacing != elevation)
+    return nsReturnRef<HRTFElevation>();
+
+  // Spacing, in degrees, between every azimuth loaded from resource.
+  // Some elevations do not have data for all these intervals.
+  // See maxElevations.
+  static const unsigned AzimuthSpacing = 15;
+  static const unsigned NumberOfRawAzimuths = 360 / AzimuthSpacing;
+  static_assert(AzimuthSpacing * NumberOfRawAzimuths == 360, "Not a multiple");
+  static const unsigned InterpolationFactor =
+      NumberOfTotalAzimuths / NumberOfRawAzimuths;
+  static_assert(
+      NumberOfTotalAzimuths == NumberOfRawAzimuths * InterpolationFactor,
+      "Not a multiple");
+
+  HRTFKernelList kernelListL;
+  kernelListL.SetLength(NumberOfTotalAzimuths);
+
+  SpeexResamplerState* resampler =
+      sampleRate == rawSampleRate
+          ? nullptr
+          : speex_resampler_init(1, rawSampleRate, sampleRate,
+                                 SPEEX_RESAMPLER_QUALITY_MIN, nullptr);
+
+  // Load convolution kernels from HRTF files.
+  int interpolatedIndex = 0;
+  for (unsigned rawIndex = 0; rawIndex < NumberOfRawAzimuths; ++rawIndex) {
+    // Don't let elevation exceed maximum for this azimuth.
+    int maxElevation = maxElevations[rawIndex];
+    int actualElevation = std::min(elevation, maxElevation);
+
+    kernelListL[interpolatedIndex] = calculateKernelForAzimuthElevation(
+        rawIndex * AzimuthSpacing, actualElevation, resampler, sampleRate);
+
+    interpolatedIndex += InterpolationFactor;
+  }
+
+  if (resampler) speex_resampler_destroy(resampler);
+
+  // Now go back and interpolate intermediate azimuth values.
+  for (unsigned i = 0; i < NumberOfTotalAzimuths; i += InterpolationFactor) {
+    int j = (i + InterpolationFactor) % NumberOfTotalAzimuths;
+
+    // Create the interpolated convolution kernels and delays.
+    for (unsigned jj = 1; jj < InterpolationFactor; ++jj) {
+      float x =
+          float(jj) / float(InterpolationFactor);  // interpolate from 0 -> 1
+
+      kernelListL[i + jj] = HRTFKernel::createInterpolatedKernel(
+          kernelListL[i], kernelListL[j], x);
+    }
+  }
+
+  return nsReturnRef<HRTFElevation>(
+      new HRTFElevation(std::move(kernelListL), elevation, sampleRate));
+}
+
+nsReturnRef<HRTFElevation> HRTFElevation::createByInterpolatingSlices(
+    HRTFElevation* hrtfElevation1, HRTFElevation* hrtfElevation2, float x,
+    float sampleRate) {
+  MOZ_ASSERT(hrtfElevation1 && hrtfElevation2);
+  if (!hrtfElevation1 || !hrtfElevation2) return nsReturnRef<HRTFElevation>();
+
+  MOZ_ASSERT(x >= 0.0 && x < 1.0);
+
+  HRTFKernelList kernelListL;
+  kernelListL.SetLength(NumberOfTotalAzimuths);
+
+  const HRTFKernelList& kernelListL1 = hrtfElevation1->kernelListL();
+  const HRTFKernelList& kernelListL2 = hrtfElevation2->kernelListL();
+
+  // Interpolate kernels of corresponding azimuths of the two elevations.
+  for (unsigned i = 0; i < NumberOfTotalAzimuths; ++i) {
+    kernelListL[i] = HRTFKernel::createInterpolatedKernel(kernelListL1[i],
+                                                          kernelListL2[i], x);
+  }
+
+  // Interpolate elevation angle.
+  double angle = (1.0 - x) * hrtfElevation1->elevationAngle() +
+                 x * hrtfElevation2->elevationAngle();
+
+  return nsReturnRef<HRTFElevation>(new HRTFElevation(
+      std::move(kernelListL), static_cast<int>(angle), sampleRate));
+}
+
+void HRTFElevation::getKernelsFromAzimuth(
+    double azimuthBlend, unsigned azimuthIndex, HRTFKernel*& kernelL,
+    HRTFKernel*& kernelR, double& frameDelayL, double& frameDelayR) {
+  bool checkAzimuthBlend = azimuthBlend >= 0.0 && azimuthBlend < 1.0;
+  MOZ_ASSERT(checkAzimuthBlend);
+  if (!checkAzimuthBlend) azimuthBlend = 0.0;
+
+  unsigned numKernels = m_kernelListL.Length();
+
+  bool isIndexGood = azimuthIndex < numKernels;
+  MOZ_ASSERT(isIndexGood);
+  if (!isIndexGood) {
+    kernelL = 0;
+    kernelR = 0;
+    return;
+  }
+
+  // Return the left and right kernels,
+  // using symmetry to produce the right kernel.
+  kernelL = m_kernelListL[azimuthIndex];
+  int azimuthIndexR = (numKernels - azimuthIndex) % numKernels;
+  kernelR = m_kernelListL[azimuthIndexR];
+
+  frameDelayL = kernelL->frameDelay();
+  frameDelayR = kernelR->frameDelay();
+
+  int azimuthIndex2L = (azimuthIndex + 1) % numKernels;
+  double frameDelay2L = m_kernelListL[azimuthIndex2L]->frameDelay();
+  int azimuthIndex2R = (numKernels - azimuthIndex2L) % numKernels;
+  double frameDelay2R = m_kernelListL[azimuthIndex2R]->frameDelay();
+
+  // Linearly interpolate delays.
+  frameDelayL =
+      (1.0 - azimuthBlend) * frameDelayL + azimuthBlend * frameDelay2L;
+  frameDelayR =
+      (1.0 - azimuthBlend) * frameDelayR + azimuthBlend * frameDelay2R;
+}
+
+}  // namespace WebCore