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/*
** ClanLib SDK
** Copyright (c) 1997-2005 The ClanLib Team
**
** This software is provided 'as-is', without any express or implied
** warranty. In no event will the authors be held liable for any damages
** arising from the use of this software.
**
** Permission is granted to anyone to use this software for any purpose,
** including commercial applications, and to alter it and redistribute it
** freely, subject to the following restrictions:
**
** 1. The origin of this software must not be misrepresented; you must not
** claim that you wrote the original software. If you use this software
** in a product, an acknowledgment in the product documentation would be
** appreciated but is not required.
** 2. Altered source versions must be plainly marked as such, and must not be
** misrepresented as being the original software.
** 3. This notice may not be removed or altered from any source distribution.
**
** Note: Some of the libraries ClanLib may link to may have additional
** requirements or restrictions.
**
** File Author(s):
**
** Magnus Norddahl
** (if your name is missing here, please add it)
*/
#include "Sound/precomp.h"
#ifdef _MSC_VER
#pragma warning (disable:4786)
#endif
#include "echofilter_generic.h"
#include <memory.h>
CL_EchoFilter::CL_EchoFilter(int buffer_size, int shift_factor)
{
impl = new CL_EchoFilter_Generic;
impl->buffer_size = buffer_size;
impl->shift_factor = shift_factor;
impl->pos = 0;
impl->buffer[0] = new int[buffer_size];
memset(impl->buffer[0], 0, sizeof(int)*buffer_size);
impl->buffer[1] = new int[buffer_size];
memset(impl->buffer[1], 0, sizeof(int)*buffer_size);
}
CL_EchoFilter::~CL_EchoFilter()
{
delete[] impl->buffer[0];
delete[] impl->buffer[1];
delete impl;
}
void CL_EchoFilter::filter(int **sample_data, int num_samples, int channels)
{
int start_pos = impl->pos;
for (int c=0; c<2; c++)
{
if (c == channels) break;
int *data = sample_data[c];
int *buffer = impl->buffer[c];
int &pos = impl->pos;
int &buffer_size = impl->buffer_size;
int &shift_factor = impl->shift_factor;
pos = start_pos;
for (int i=0; i<num_samples; i++)
{
buffer[pos] /= shift_factor;
buffer[pos] += data[i];
data[i] = buffer[pos];
pos++;
if (pos == buffer_size) pos = 0;
}
}
}
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