delay.cc | Explore in Territory

/*
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. 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 INC. 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.
 */

#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif

#include "third_party/blink/renderer/platform/audio/delay.h"

#include <cmath>

#include "base/notreached.h"
#include "build/build_config.h"
#include "third_party/blink/renderer/platform/audio/audio_utilities.h"
#include "third_party/blink/renderer/platform/audio/vector_math.h"
#include "third_party/blink/renderer/platform/wtf/math_extras.h"

namespace blink {

namespace {

void CopyToCircularBuffer(float* buffer,
                          int write_index,
                          int buffer_length,
                          const float* source,
                          uint32_t frames_to_process) { … }

}  // namespace

Delay::Delay(double max_delay_time,
             float sample_rate,
             unsigned render_quantum_frames)
    : … { … }

size_t Delay::BufferLengthForDelay(double max_delay_time,
                                   double sample_rate,
                                   unsigned render_quantum_frames) const { … }

double Delay::DelayTime(float sample_rate) { … }

#if !(defined(ARCH_CPU_X86_FAMILY) || defined(CPU_ARM_NEON))
// Default scalar versions if simd/neon are not available.
std::tuple<unsigned, int> Delay::ProcessARateVector(
    float* destination,
    uint32_t frames_to_process) const {
  // We don't have a vectorized version, so just do nothing and return the 0 to
  // indicate no frames processed and return the current write_index_.
  return std::make_tuple(0, write_index_);
}

void Delay::HandleNaN(float* delay_times,
                      uint32_t frames_to_process,
                      float max_time) {
  for (unsigned k = 0; k < frames_to_process; ++k) {
    if (std::isnan(delay_times[k])) {
      delay_times[k] = max_time;
    }
  }
}
#endif

int Delay::ProcessARateScalar(unsigned start,
                              int w_index,
                              float* destination,
                              uint32_t frames_to_process) const { … }

void Delay::ProcessARate(const float* source,
                         float* destination,
                         uint32_t frames_to_process) { … }

void Delay::ProcessKRate(const float* source,
                         float* destination,
                         uint32_t frames_to_process) { … }

void Delay::Reset() { … }

}  // namespace blink
chromium/third_party/blink/renderer/platform/audio/delay.cc
