111 lines
2.7 KiB
C++
111 lines
2.7 KiB
C++
/*
|
|
* 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
|
|
{
|
|
|
|
enum ResamplerType
|
|
{
|
|
// 4 MSB = Number of channels
|
|
// 4 LSB = Synchronous or asynchronous
|
|
|
|
kResamplerSynchronous = 0x10,
|
|
kResamplerAsynchronous = 0x11,
|
|
kResamplerSynchronousStereo = 0x20,
|
|
kResamplerAsynchronousStereo = 0x21,
|
|
kResamplerInvalid = 0xff
|
|
};
|
|
|
|
enum ResamplerMode
|
|
{
|
|
kResamplerMode1To1,
|
|
kResamplerMode1To2,
|
|
kResamplerMode1To3,
|
|
kResamplerMode1To4,
|
|
kResamplerMode1To6,
|
|
kResamplerMode2To3,
|
|
kResamplerMode2To11,
|
|
kResamplerMode4To11,
|
|
kResamplerMode8To11,
|
|
kResamplerMode11To16,
|
|
kResamplerMode11To32,
|
|
kResamplerMode2To1,
|
|
kResamplerMode3To1,
|
|
kResamplerMode4To1,
|
|
kResamplerMode6To1,
|
|
kResamplerMode3To2,
|
|
kResamplerMode11To2,
|
|
kResamplerMode11To4,
|
|
kResamplerMode11To8
|
|
};
|
|
|
|
class Resampler
|
|
{
|
|
|
|
public:
|
|
Resampler();
|
|
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_
|