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/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/*
* A wrapper for resampling a numerous amount of sampling combinations.
*/
#ifndef WEBRTC_RESAMPLER_RESAMPLER_H_
#define WEBRTC_RESAMPLER_RESAMPLER_H_
#include "typedefs.h"
namespace webrtc
{
// TODO(andrew): the implementation depends on the exact values of this enum.
// It should be rewritten in a less fragile way.
enum ResamplerType
{
// 4 MSB = Number of channels
// 4 LSB = Synchronous or asynchronous
kResamplerSynchronous = 0x10,
kResamplerAsynchronous = 0x11,
kResamplerSynchronousStereo = 0x20,
kResamplerAsynchronousStereo = 0x21,
kResamplerInvalid = 0xff
};
// TODO(andrew): doesn't need to be part of the interface.
enum ResamplerMode
{
kResamplerMode1To1,
kResamplerMode1To2,
kResamplerMode1To3,
kResamplerMode1To4,
kResamplerMode1To6,
kResamplerMode1To12,
kResamplerMode2To3,
kResamplerMode2To11,
kResamplerMode4To11,
kResamplerMode8To11,
kResamplerMode11To16,
kResamplerMode11To32,
kResamplerMode2To1,
kResamplerMode3To1,
kResamplerMode4To1,
kResamplerMode6To1,
kResamplerMode12To1,
kResamplerMode3To2,
kResamplerMode11To2,
kResamplerMode11To4,
kResamplerMode11To8
};
class Resampler
{
public:
Resampler();
// TODO(andrew): use an init function instead.
Resampler(int inFreq, int outFreq, ResamplerType type);
~Resampler();
// Reset all states
int Reset(int inFreq, int outFreq, ResamplerType type);
// Reset all states if any parameter has changed
int ResetIfNeeded(int inFreq, int outFreq, ResamplerType type);
// Synchronous resampling, all output samples are written to samplesOut
int Push(const WebRtc_Word16* samplesIn, int lengthIn, WebRtc_Word16* samplesOut,
int maxLen, int &outLen);
// Asynchronous resampling, input
int Insert(WebRtc_Word16* samplesIn, int lengthIn);
// Asynchronous resampling output, remaining samples are buffered
int Pull(WebRtc_Word16* samplesOut, int desiredLen, int &outLen);
private:
// Generic pointers since we don't know what states we'll need
void* state1_;
void* state2_;
void* state3_;
// Storage if needed
WebRtc_Word16* in_buffer_;
WebRtc_Word16* out_buffer_;
int in_buffer_size_;
int out_buffer_size_;
int in_buffer_size_max_;
int out_buffer_size_max_;
// State
int my_in_frequency_khz_;
int my_out_frequency_khz_;
ResamplerMode my_mode_;
ResamplerType my_type_;
// Extra instance for stereo
Resampler* slave_left_;
Resampler* slave_right_;
};
} // namespace webrtc
#endif // WEBRTC_RESAMPLER_RESAMPLER_H_
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