8fc05feed4
Includes a unittest to ensure we meet the same quality thresholds as SincResampler (modulo quantization error). BUG=webrtc:1395 Review URL: https://webrtc-codereview.appspot.com/1323011 git-svn-id: http://webrtc.googlecode.com/svn/trunk@3909 4adac7df-926f-26a2-2b94-8c16560cd09d
56 lines
1.8 KiB
C++
56 lines
1.8 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 WEBRTC_COMMON_AUDIO_RESAMPLER_SINUSOIDAL_LINEAR_CHIRP_SOURCE_H_
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#define WEBRTC_COMMON_AUDIO_RESAMPLER_SINUSOIDAL_LINEAR_CHIRP_SOURCE_H_
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#include "webrtc/common_audio/resampler/sinc_resampler.h"
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#include "webrtc/system_wrappers/interface/constructor_magic.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, int samples,
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double max_frequency, double delay_samples);
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virtual ~SinusoidalLinearChirpSource() {}
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virtual void Run(float* destination, int frames);
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double Frequency(int position);
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private:
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enum {
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kMinFrequency = 5
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};
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double sample_rate_;
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int total_samples_;
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double max_frequency_;
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double k_;
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int current_index_;
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double delay_samples_;
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DISALLOW_COPY_AND_ASSIGN(SinusoidalLinearChirpSource);
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};
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} // namespace webrtc
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#endif // WEBRTC_COMMON_AUDIO_RESAMPLER_SINUSOIDAL_LINEAR_CHIRP_SOURCE_H_
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