169 lines
3.7 KiB
C++
Executable File
169 lines
3.7 KiB
C++
Executable File
/*
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FPUUpsampler2x.h
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Copyright (c) 2005 Laurent de Soras
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Upsamples by a factor 2 the input signal, using FPU.
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Template parameters:
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- NC: number of coefficients, > 0
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--- Legal stuff ---
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This program is free software. It comes without any warranty, to
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the extent permitted by applicable law. You can redistribute it
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and/or modify it under the terms of the Do What The Fuck You Want
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To Public License, Version 2, as published by Sam Hocevar. See
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http://sam.zoy.org/wtfpl/COPYING for more details.
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*/
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#pragma once
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#include <array>
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#include "FPUStageProc.h"
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namespace hiir
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{
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template <int NC, typename T>
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class Upsampler2xFPU
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{
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public:
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enum { NBR_COEFS = NC };
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Upsampler2xFPU ();
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/*
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Name: set_coefs
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Description:
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Sets filter coefficients. Generate them with the PolyphaseIir2Designer
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class.
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Call this function before doing any processing.
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Input parameters:
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- coef_arr: Array of coefficients. There should be as many coefficients as
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mentioned in the class template parameter.
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*/
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void set_coefs (const double coef_arr [NBR_COEFS]);
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/*
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Name: process_sample
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Description:
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Upsamples (x2) the input sample, generating two output samples.
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Input parameters:
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- input: The input sample.
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Output parameters:
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- out_0: First output sample.
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- out_1: Second output sample.
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*/
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inline void process_sample (T &out_0, T &out_1, T input);
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/*
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Name: process_block
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Description:
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Upsamples (x2) the input sample block.
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Input and output blocks may overlap, see assert() for details.
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Input parameters:
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- in_ptr: Input array, containing nbr_spl samples.
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- nbr_spl: Number of input samples to process, > 0
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Output parameters:
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- out_0_ptr: Output sample array, capacity: nbr_spl * 2 samples.
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*/
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void process_block (T out_ptr [], const T in_ptr [], long nbr_spl);
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/*
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Name: clear_buffers
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Description:
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Clears filter memory, as if it processed silence since an infinite amount
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of time.
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*/
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void clear_buffers ();
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private:
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std::array<T, NBR_COEFS> _coef;
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std::array<T, NBR_COEFS> _x;
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std::array<T, NBR_COEFS> _y;
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private:
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bool operator == (const Upsampler2xFPU &other);
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bool operator != (const Upsampler2xFPU &other);
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}; // class Upsampler2xFPU
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template <int NC, typename T>
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Upsampler2xFPU <NC, T>::Upsampler2xFPU ()
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: _coef ()
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, _x ()
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, _y ()
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{
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for (int i = 0; i < NBR_COEFS; ++i)
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{
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_coef [i] = 0;
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}
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clear_buffers ();
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}
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template <int NC, typename T>
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void Upsampler2xFPU <NC, T>::set_coefs (const double coef_arr [NBR_COEFS])
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{
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assert (coef_arr != 0);
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for (int i = 0; i < NBR_COEFS; ++i)
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{
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_coef [i] = static_cast <T> (coef_arr [i]);
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}
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}
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template <int NC, typename T>
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void Upsampler2xFPU <NC, T>::process_sample (T &out_0, T &out_1, T input)
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{
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// assert (&out_0 != 0);
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// assert (&out_1 != 0);
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T even = input;
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T odd = input;
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StageProcFPU <NBR_COEFS, T>::process_sample_pos (
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NBR_COEFS,
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even,
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odd,
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&_coef [0],
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&_x [0],
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&_y [0]
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);
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out_0 = even;
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out_1 = odd;
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}
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template <int NC, typename T>
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void Upsampler2xFPU <NC, T>::process_block (T out_ptr [], const T in_ptr [], long nbr_spl)
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{
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// assert (out_ptr != 0);
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// assert (in_ptr != 0);
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// assert (out_ptr >= in_ptr + nbr_spl || in_ptr >= out_ptr + nbr_spl);
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// assert (nbr_spl > 0);
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long pos = 0;
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do
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{
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process_sample (
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out_ptr [pos * 2],
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out_ptr [pos * 2 + 1],
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in_ptr [pos]
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);
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++ pos;
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}
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while (pos < nbr_spl);
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}
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template <int NC, typename T>
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void Upsampler2xFPU <NC, T>::clear_buffers ()
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{
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for (int i = 0; i < NBR_COEFS; ++i)
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{
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_x [i] = 0;
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_y [i] = 0;
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}
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}
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} // namespace hiir
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