zircon/system/uapp/audio/noise-source.h

// Copyright 2020 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef ZIRCON_SYSTEM_UAPP_AUDIO_NOISE_SOURCE_H_
#define ZIRCON_SYSTEM_UAPP_AUDIO_NOISE_SOURCE_H_

#include <lib/zx/clock.h>
#include <math.h>

#include "generated-source.h"

class NoiseSource : public GeneratedSource {
 public:
  zx_status_t Init(float freq, float amp, float duration_secs, uint32_t frame_rate,
                   uint32_t channels, uint32_t active,
                   audio_sample_format_t sample_format) override {
    auto status = GeneratedSource::Init(freq, amp, duration_secs, frame_rate, channels, active,
                                        sample_format);
    pos_scalar_ = 0;
    auto seed = zx::clock::get_monotonic().get();
    srand48(seed);

    return status;
  }

  double GenerateValue(double pos) override { return drand48(); }
};

#endif  // ZIRCON_SYSTEM_UAPP_AUDIO_NOISE_SOURCE_H_