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101 lines
3.0 KiB
101 lines
3.0 KiB
/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef ANDROID_AUDIO_RESAMPLER_SINC_H
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#define ANDROID_AUDIO_RESAMPLER_SINC_H
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#include <stdint.h>
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#include <sys/types.h>
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#include <android/log.h>
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#include <media/AudioResampler.h>
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namespace android {
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typedef const int32_t * (*readCoefficientsFn)(bool upDownSample);
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typedef int32_t (*readResampleFirNumCoeffFn)();
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typedef int32_t (*readResampleFirLerpIntBitsFn)();
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// ----------------------------------------------------------------------------
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class AudioResamplerSinc : public AudioResampler {
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public:
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AudioResamplerSinc(int inChannelCount, int32_t sampleRate,
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src_quality quality = HIGH_QUALITY);
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virtual ~AudioResamplerSinc();
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virtual size_t resample(int32_t* out, size_t outFrameCount,
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AudioBufferProvider* provider);
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private:
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void init();
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virtual void setVolume(float left, float right);
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template<int CHANNELS>
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size_t resample(int32_t* out, size_t outFrameCount,
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AudioBufferProvider* provider);
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template<int CHANNELS>
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inline void filterCoefficient(
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int32_t* out, uint32_t phase, const int16_t *samples, uint32_t vRL);
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template<int CHANNELS>
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inline void interpolate(
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int32_t& l, int32_t& r,
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const int32_t* coefs, size_t offset,
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int32_t lerp, const int16_t* samples);
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template<int CHANNELS>
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inline void read(int16_t*& impulse, uint32_t& phaseFraction,
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const int16_t* in, size_t inputIndex);
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int16_t *mState;
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int16_t *mImpulse;
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int16_t *mRingFull;
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int32_t mVolumeSIMD[2];
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const int32_t * mFirCoefs;
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static const uint32_t mFirCoefsDown[];
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static const uint32_t mFirCoefsUp[];
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// ----------------------------------------------------------------------------
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static const int32_t RESAMPLE_FIR_NUM_COEF = 8;
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static const int32_t RESAMPLE_FIR_LERP_INT_BITS = 7;
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struct Constants {
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int coefsBits;
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int cShift;
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uint32_t cMask;
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int pShift;
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uint32_t pMask;
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// number of zero-crossing on each side
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unsigned int halfNumCoefs;
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};
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static Constants highQualityConstants;
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static Constants veryHighQualityConstants;
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const Constants *mConstants; // points to appropriate set of coefficient parameters
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static void init_routine();
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};
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// ----------------------------------------------------------------------------
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} // namespace android
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#endif /*ANDROID_AUDIO_RESAMPLER_SINC_H*/
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