Changed the delay estimator to be built using C++

webrtc/modules/audio_processing/utility/delay_estimator_wrapper.c

-/*
- *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#include "webrtc/modules/audio_processing/utility/delay_estimator_wrapper.h"
-
-#include <assert.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "webrtc/modules/audio_processing/utility/delay_estimator.h"
-#include "webrtc/modules/audio_processing/utility/delay_estimator_internal.h"
-#include "webrtc/system_wrappers/include/compile_assert_c.h"
-
-// Only bit |kBandFirst| through bit |kBandLast| are processed and
-// |kBandFirst| - |kBandLast| must be < 32.
-enum { kBandFirst = 12 };
-enum { kBandLast = 43 };
-
-static __inline uint32_t SetBit(uint32_t in, int pos) {
-  uint32_t mask = (1 << pos);
-  uint32_t out = (in | mask);
-
-  return out;
-}
-
-// Calculates the mean recursively. Same version as WebRtc_MeanEstimatorFix(),
-// but for float.
-//
-// Inputs:
-//    - new_value             : New additional value.
-//    - scale                 : Scale for smoothing (should be less than 1.0).
-//
-// Input/Output:
-//    - mean_value            : Pointer to the mean value for updating.
-//
-static void MeanEstimatorFloat(float new_value,
-                               float scale,
-                               float* mean_value) {
-  assert(scale < 1.0f);
-  *mean_value += (new_value - *mean_value) * scale;
-}
-
-// Computes the binary spectrum by comparing the input |spectrum| with a
-// |threshold_spectrum|. Float and fixed point versions.
-//
-// Inputs:
-//      - spectrum            : Spectrum of which the binary spectrum should be
-//                              calculated.
-//      - threshold_spectrum  : Threshold spectrum with which the input
-//                              spectrum is compared.
-// Return:
-//      - out                 : Binary spectrum.
-//
-static uint32_t BinarySpectrumFix(const uint16_t* spectrum,
-                                  SpectrumType* threshold_spectrum,
-                                  int q_domain,
-                                  int* threshold_initialized) {
-  int i = kBandFirst;
-  uint32_t out = 0;
-
-  assert(q_domain < 16);
-
-  if (!(*threshold_initialized)) {
-    // Set the |threshold_spectrum| to half the input |spectrum| as starting
-    // value. This speeds up the convergence.
-    for (i = kBandFirst; i <= kBandLast; i++) {
-      if (spectrum[i] > 0) {
-        // Convert input spectrum from Q(|q_domain|) to Q15.
-        int32_t spectrum_q15 = ((int32_t) spectrum[i]) << (15 - q_domain);
-        threshold_spectrum[i].int32_ = (spectrum_q15 >> 1);
-        *threshold_initialized = 1;
-      }
-    }
-  }
-  for (i = kBandFirst; i <= kBandLast; i++) {
-    // Convert input spectrum from Q(|q_domain|) to Q15.
-    int32_t spectrum_q15 = ((int32_t) spectrum[i]) << (15 - q_domain);
-    // Update the |threshold_spectrum|.
-    WebRtc_MeanEstimatorFix(spectrum_q15, 6, &(threshold_spectrum[i].int32_));
-    // Convert |spectrum| at current frequency bin to a binary value.
-    if (spectrum_q15 > threshold_spectrum[i].int32_) {
-      out = SetBit(out, i - kBandFirst);
-    }
-  }
-
-  return out;
-}
-
-static uint32_t BinarySpectrumFloat(const float* spectrum,
-                                    SpectrumType* threshold_spectrum,
-                                    int* threshold_initialized) {
-  int i = kBandFirst;
-  uint32_t out = 0;
-  const float kScale = 1 / 64.0;
-
-  if (!(*threshold_initialized)) {
-    // Set the |threshold_spectrum| to half the input |spectrum| as starting
-    // value. This speeds up the convergence.
-    for (i = kBandFirst; i <= kBandLast; i++) {
-      if (spectrum[i] > 0.0f) {
-        threshold_spectrum[i].float_ = (spectrum[i] / 2);
-        *threshold_initialized = 1;
-      }
-    }
-  }
-
-  for (i = kBandFirst; i <= kBandLast; i++) {
-    // Update the |threshold_spectrum|.
-    MeanEstimatorFloat(spectrum[i], kScale, &(threshold_spectrum[i].float_));
-    // Convert |spectrum| at current frequency bin to a binary value.
-    if (spectrum[i] > threshold_spectrum[i].float_) {
-      out = SetBit(out, i - kBandFirst);
-    }
-  }
-
-  return out;
-}
-
-void WebRtc_FreeDelayEstimatorFarend(void* handle) {
-  DelayEstimatorFarend* self = (DelayEstimatorFarend*) handle;
-
-  if (handle == NULL) {
-    return;
-  }
-
-  free(self->mean_far_spectrum);
-  self->mean_far_spectrum = NULL;
-
-  WebRtc_FreeBinaryDelayEstimatorFarend(self->binary_farend);
-  self->binary_farend = NULL;
-
-  free(self);
-}
-
-void* WebRtc_CreateDelayEstimatorFarend(int spectrum_size, int history_size) {
-  DelayEstimatorFarend* self = NULL;
-
-  // Check if the sub band used in the delay estimation is small enough to fit
-  // the binary spectra in a uint32_t.
-  COMPILE_ASSERT(kBandLast - kBandFirst < 32);
-
-  if (spectrum_size >= kBandLast) {
-    self = malloc(sizeof(DelayEstimatorFarend));
-  }
-
-  if (self != NULL) {
-    int memory_fail = 0;
-
-    // Allocate memory for the binary far-end spectrum handling.
-    self->binary_farend = WebRtc_CreateBinaryDelayEstimatorFarend(history_size);
-    memory_fail |= (self->binary_farend == NULL);
-
-    // Allocate memory for spectrum buffers.
-    self->mean_far_spectrum = malloc(spectrum_size * sizeof(SpectrumType));
-    memory_fail |= (self->mean_far_spectrum == NULL);
-
-    self->spectrum_size = spectrum_size;
-
-    if (memory_fail) {
-      WebRtc_FreeDelayEstimatorFarend(self);
-      self = NULL;
-    }
-  }
-
-  return self;
-}
-
-int WebRtc_InitDelayEstimatorFarend(void* handle) {
-  DelayEstimatorFarend* self = (DelayEstimatorFarend*) handle;
-
-  if (self == NULL) {
-    return -1;
-  }
-
-  // Initialize far-end part of binary delay estimator.
-  WebRtc_InitBinaryDelayEstimatorFarend(self->binary_farend);
-
-  // Set averaged far and near end spectra to zero.
-  memset(self->mean_far_spectrum, 0,
-         sizeof(SpectrumType) * self->spectrum_size);
-  // Reset initialization indicators.
-  self->far_spectrum_initialized = 0;
-
-  return 0;
-}
-
-void WebRtc_SoftResetDelayEstimatorFarend(void* handle, int delay_shift) {
-  DelayEstimatorFarend* self = (DelayEstimatorFarend*) handle;
-  assert(self != NULL);
-  WebRtc_SoftResetBinaryDelayEstimatorFarend(self->binary_farend, delay_shift);
-}
-
-int WebRtc_AddFarSpectrumFix(void* handle,
-                             const uint16_t* far_spectrum,
-                             int spectrum_size,
-                             int far_q) {
-  DelayEstimatorFarend* self = (DelayEstimatorFarend*) handle;
-  uint32_t binary_spectrum = 0;
-
-  if (self == NULL) {
-    return -1;
-  }
-  if (far_spectrum == NULL) {
-    // Empty far end spectrum.
-    return -1;
-  }
-  if (spectrum_size != self->spectrum_size) {
-    // Data sizes don't match.
-    return -1;
-  }
-  if (far_q > 15) {
-    // If |far_q| is larger than 15 we cannot guarantee no wrap around.
-    return -1;
-  }
-
-  // Get binary spectrum.
-  binary_spectrum = BinarySpectrumFix(far_spectrum, self->mean_far_spectrum,
-                                      far_q, &(self->far_spectrum_initialized));
-  WebRtc_AddBinaryFarSpectrum(self->binary_farend, binary_spectrum);
-
-  return 0;
-}
-
-int WebRtc_AddFarSpectrumFloat(void* handle,
-                               const float* far_spectrum,
-                               int spectrum_size) {
-  DelayEstimatorFarend* self = (DelayEstimatorFarend*) handle;
-  uint32_t binary_spectrum = 0;
-
-  if (self == NULL) {
-    return -1;
-  }
-  if (far_spectrum == NULL) {
-    // Empty far end spectrum.
-    return -1;
-  }
-  if (spectrum_size != self->spectrum_size) {
-    // Data sizes don't match.
-    return -1;
-  }
-
-  // Get binary spectrum.
-  binary_spectrum = BinarySpectrumFloat(far_spectrum, self->mean_far_spectrum,
-                                        &(self->far_spectrum_initialized));
-  WebRtc_AddBinaryFarSpectrum(self->binary_farend, binary_spectrum);
-
-  return 0;
-}
-
-void WebRtc_FreeDelayEstimator(void* handle) {
-  DelayEstimator* self = (DelayEstimator*) handle;
-
-  if (handle == NULL) {
-    return;
-  }
-
-  free(self->mean_near_spectrum);
-  self->mean_near_spectrum = NULL;
-
-  WebRtc_FreeBinaryDelayEstimator(self->binary_handle);
-  self->binary_handle = NULL;
-
-  free(self);
-}
-
-void* WebRtc_CreateDelayEstimator(void* farend_handle, int max_lookahead) {
-  DelayEstimator* self = NULL;
-  DelayEstimatorFarend* farend = (DelayEstimatorFarend*) farend_handle;
-
-  if (farend_handle != NULL) {
-    self = malloc(sizeof(DelayEstimator));
-  }
-
-  if (self != NULL) {
-    int memory_fail = 0;
-
-    // Allocate memory for the farend spectrum handling.
-    self->binary_handle =
-        WebRtc_CreateBinaryDelayEstimator(farend->binary_farend, max_lookahead);
-    memory_fail |= (self->binary_handle == NULL);
-
-    // Allocate memory for spectrum buffers.
-    self->mean_near_spectrum = malloc(farend->spectrum_size *
-                                      sizeof(SpectrumType));
-    memory_fail |= (self->mean_near_spectrum == NULL);
-
-    self->spectrum_size = farend->spectrum_size;
-
-    if (memory_fail) {
-      WebRtc_FreeDelayEstimator(self);
-      self = NULL;
-    }
-  }
-
-  return self;
-}
-
-int WebRtc_InitDelayEstimator(void* handle) {
-  DelayEstimator* self = (DelayEstimator*) handle;
-
-  if (self == NULL) {
-    return -1;
-  }
-
-  // Initialize binary delay estimator.
-  WebRtc_InitBinaryDelayEstimator(self->binary_handle);
-
-  // Set averaged far and near end spectra to zero.
-  memset(self->mean_near_spectrum, 0,
-         sizeof(SpectrumType) * self->spectrum_size);
-  // Reset initialization indicators.
-  self->near_spectrum_initialized = 0;
-
-  return 0;
-}
-
-int WebRtc_SoftResetDelayEstimator(void* handle, int delay_shift) {
-  DelayEstimator* self = (DelayEstimator*) handle;
-  assert(self != NULL);
-  return WebRtc_SoftResetBinaryDelayEstimator(self->binary_handle, delay_shift);
-}
-
-int WebRtc_set_history_size(void* handle, int history_size) {
-  DelayEstimator* self = handle;
-
-  if ((self == NULL) || (history_size <= 1)) {
-    return -1;
-  }
-  return WebRtc_AllocateHistoryBufferMemory(self->binary_handle, history_size);
-}
-
-int WebRtc_history_size(const void* handle) {
-  const DelayEstimator* self = handle;
-
-  if (self == NULL) {
-    return -1;
-  }
-  if (self->binary_handle->farend->history_size !=
-      self->binary_handle->history_size) {
-    // Non matching history sizes.
-    return -1;
-  }
-  return self->binary_handle->history_size;
-}
-
-int WebRtc_set_lookahead(void* handle, int lookahead) {
-  DelayEstimator* self = (DelayEstimator*) handle;
-  assert(self != NULL);
-  assert(self->binary_handle != NULL);
-  if ((lookahead > self->binary_handle->near_history_size - 1) ||
-      (lookahead < 0)) {
-    return -1;
-  }
-  self->binary_handle->lookahead = lookahead;
-  return self->binary_handle->lookahead;
-}
-
-int WebRtc_lookahead(void* handle) {
-  DelayEstimator* self = (DelayEstimator*) handle;
-  assert(self != NULL);
-  assert(self->binary_handle != NULL);
-  return self->binary_handle->lookahead;
-}
-
-int WebRtc_set_allowed_offset(void* handle, int allowed_offset) {
-  DelayEstimator* self = (DelayEstimator*) handle;
-
-  if ((self == NULL) || (allowed_offset < 0)) {
-    return -1;
-  }
-  self->binary_handle->allowed_offset = allowed_offset;
-  return 0;
-}
-
-int WebRtc_get_allowed_offset(const void* handle) {
-  const DelayEstimator* self = (const DelayEstimator*) handle;
-
-  if (self == NULL) {
-    return -1;
-  }
-  return self->binary_handle->allowed_offset;
-}
-
-int WebRtc_enable_robust_validation(void* handle, int enable) {
-  DelayEstimator* self = (DelayEstimator*) handle;
-
-  if (self == NULL) {
-    return -1;
-  }
-  if ((enable < 0) || (enable > 1)) {
-    return -1;
-  }
-  assert(self->binary_handle != NULL);
-  self->binary_handle->robust_validation_enabled = enable;
-  return 0;
-}
-
-int WebRtc_is_robust_validation_enabled(const void* handle) {
-  const DelayEstimator* self = (const DelayEstimator*) handle;
-
-  if (self == NULL) {
-    return -1;
-  }
-  return self->binary_handle->robust_validation_enabled;
-}
-
-int WebRtc_DelayEstimatorProcessFix(void* handle,
-                                    const uint16_t* near_spectrum,
-                                    int spectrum_size,
-                                    int near_q) {
-  DelayEstimator* self = (DelayEstimator*) handle;
-  uint32_t binary_spectrum = 0;
-
-  if (self == NULL) {
-    return -1;
-  }
-  if (near_spectrum == NULL) {
-    // Empty near end spectrum.
-    return -1;
-  }
-  if (spectrum_size != self->spectrum_size) {
-    // Data sizes don't match.
-    return -1;
-  }
-  if (near_q > 15) {
-    // If |near_q| is larger than 15 we cannot guarantee no wrap around.
-    return -1;
-  }
-
-  // Get binary spectra.
-  binary_spectrum = BinarySpectrumFix(near_spectrum,
-                                      self->mean_near_spectrum,
-                                      near_q,
-                                      &(self->near_spectrum_initialized));
-
-  return WebRtc_ProcessBinarySpectrum(self->binary_handle, binary_spectrum);
-}
-
-int WebRtc_DelayEstimatorProcessFloat(void* handle,
-                                      const float* near_spectrum,
-                                      int spectrum_size) {
-  DelayEstimator* self = (DelayEstimator*) handle;
-  uint32_t binary_spectrum = 0;
-
-  if (self == NULL) {
-    return -1;
-  }
-  if (near_spectrum == NULL) {
-    // Empty near end spectrum.
-    return -1;
-  }
-  if (spectrum_size != self->spectrum_size) {
-    // Data sizes don't match.
-    return -1;
-  }
-
-  // Get binary spectrum.
-  binary_spectrum = BinarySpectrumFloat(near_spectrum, self->mean_near_spectrum,
-                                        &(self->near_spectrum_initialized));
-
-  return WebRtc_ProcessBinarySpectrum(self->binary_handle, binary_spectrum);
-}
-
-int WebRtc_last_delay(void* handle) {
-  DelayEstimator* self = (DelayEstimator*) handle;
-
-  if (self == NULL) {
-    return -1;
-  }
-
-  return WebRtc_binary_last_delay(self->binary_handle);
-}
-
-float WebRtc_last_delay_quality(void* handle) {
-  DelayEstimator* self = (DelayEstimator*) handle;
-  assert(self != NULL);
-  return WebRtc_binary_last_delay_quality(self->binary_handle);
-}