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/*
** Copyright 2008, 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_RESAMPLER_H
#define ANDROID_RESAMPLER_H
#include <stdint.h>
#include <sys/types.h>
#include <hardware_legacy/AudioSystemLegacy.h>
#include "speex/speex_resampler.h"
namespace android_audio_legacy {
class ReSampler {
public:
class BufferProvider
{
public:
struct Buffer {
union {
void* raw;
short* i16;
int8_t* i8;
};
size_t frameCount;
};
virtual ~BufferProvider() {}
virtual status_t getNextBuffer(Buffer* buffer) = 0;
virtual void releaseBuffer(Buffer* buffer) = 0;
};
ReSampler(uint32_t inSampleRate,
uint32_t outSampleRate,
uint32_t channelCount,
BufferProvider* provider);
virtual ~ReSampler();
status_t initCheck() { return mStatus; }
void reset();
int resample(int16_t* out, size_t *outFrameCount);
int32_t delayNs();
private:
status_t mStatus; // init status
SpeexResamplerState *mSpeexResampler; // handle on speex resampler
BufferProvider* mProvider; // buffer provider installed by client
uint32_t mInSampleRate; // input sampling rate
uint32_t mOutSampleRate; // output sampling rate
uint32_t mChannelCount; // number of channels
int16_t *mInBuf; // input buffer
size_t mInBufSize; // input buffer size
size_t mFramesIn; // number of frames in input buffer
size_t mFramesRq; // cached number of output frames
size_t mFramesNeeded; // minimum number of input frames to produce mFramesRq
// output frames
int32_t mSpeexDelayNs; // delay introduced by speex resampler in ns
};
}; // namespace android_audio_legacy
#endif // ANDROID_RESAMPLER_H
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