c6abf6cd3f
Some API deprecation -- ExperimentalAgc and ExperimentalNs are gone. We're continuing to carry iSAC even though it's gone upstream, but maybe we'll want to drop that soon.
57 lines
1.9 KiB
C++
57 lines
1.9 KiB
C++
/*
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* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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// Modified from the Chromium original here:
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// src/media/base/sinc_resampler_unittest.cc
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#ifndef COMMON_AUDIO_RESAMPLER_SINUSOIDAL_LINEAR_CHIRP_SOURCE_H_
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#define COMMON_AUDIO_RESAMPLER_SINUSOIDAL_LINEAR_CHIRP_SOURCE_H_
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#include "common_audio/resampler/sinc_resampler.h"
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namespace webrtc {
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// Fake audio source for testing the resampler. Generates a sinusoidal linear
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// chirp (http://en.wikipedia.org/wiki/Chirp) which can be tuned to stress the
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// resampler for the specific sample rate conversion being used.
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class SinusoidalLinearChirpSource : public SincResamplerCallback {
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public:
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// `delay_samples` can be used to insert a fractional sample delay into the
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// source. It will produce zeros until non-negative time is reached.
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SinusoidalLinearChirpSource(int sample_rate,
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size_t samples,
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double max_frequency,
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double delay_samples);
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~SinusoidalLinearChirpSource() override {}
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SinusoidalLinearChirpSource(const SinusoidalLinearChirpSource&) = delete;
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SinusoidalLinearChirpSource& operator=(const SinusoidalLinearChirpSource&) =
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delete;
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void Run(size_t frames, float* destination) override;
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double Frequency(size_t position);
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private:
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static constexpr int kMinFrequency = 5;
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int sample_rate_;
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size_t total_samples_;
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double max_frequency_;
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double k_;
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size_t current_index_;
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double delay_samples_;
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};
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} // namespace webrtc
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#endif // COMMON_AUDIO_RESAMPLER_SINUSOIDAL_LINEAR_CHIRP_SOURCE_H_
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