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