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#ifndef CLUNK_SOURCE_H__
#define CLUNK_SOURCE_H__
/* libClunk - cross-platform 3D audio API built on top SDL library
* Copyright (C) 2007-2008 Netive Media Group
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _USE_MATH_DEFINES
#define _USE_MATH_DEFINES
#endif
#include <math.h>
#include <SDL_audio.h>
#include "export_clunk.h"
#include "v3.h"
#include "mdct_context.h"
#include "buffer.h"
struct kiss_fftr_state;
namespace clunk {
class Sample;
class Buffer;
//window function used in ogg/vorbis
template<int N, typename T>
struct vorbis_window_func : public clunk::window_func_base<N, T> {
inline T operator()(int x) const {
T s = sin(T(M_PI) * (x + 0.5f) / N);
return sin(T(M_PI_2) * s * s);
}
};
//!class holding information about source.
class CLUNKAPI Source {
public:
enum { WINDOW_BITS = 9 };
private:
typedef mdct_context<WINDOW_BITS, vorbis_window_func, float> mdct_type;
static mdct_type mdct;
public:
enum { WINDOW_SIZE = mdct_type::N };
///pointer to the sample holding audio data
const Sample * const sample;
///loop flag
bool loop;
///delta position from the object's center
v3<float> delta_position; //0 - from the center of the object.
///gain
float gain;
///pitch, 2.0f - pitching up one octave
float pitch;
/*!
panning. -1.0f = 2 * vol in left channel, 0 in right. +1.0f = no sound in left channel, 2 * vol in right.
note: panning is actually applied on mono samples in center(listener) position.
*/
float panning;
/*!
\brief constructs new source
\param[in] sample audio data
\param[in] loop loops sample
\param[in] delta delta position. (0, 0) is the object's center.
\param[in] gain gain
\param[in] pitch pitch
*/
Source(const Sample * sample, const bool loop = false, const v3<float> &delta = v3<float>(), float gain = 1, float pitch = 1, float panning = 0);
/*!
\brief for the internal use only. DO NOT USE IT.
\internal for the internal use only.
*/
float process(clunk::Buffer &buffer, unsigned ch, const v3<float> &position, const v3<float> &direction, float fx_volume, float pitch);
///returns current source's status.
bool playing() const;
/*!
\brief for the internal use only. DO NOT USE IT.
\internal for the internal use only.
*/
void update_position(const int dp);
///fades out source. usually you do not need this method
void fade_out(const float sec);
~Source();
private:
typedef const float (*kemar_ptr)[2][512];
void get_kemar_data(kemar_ptr & kemar_data, int & samples, const v3<float> &delta_position);
static void idt(const v3<float> &delta, const v3<float> &direction, float &idt_offset, float &angle_gr);
//generate hrtf response for channel idx (0 left), in result.
void hrtf(int window, const unsigned channel_idx, clunk::Buffer &result, const Sint16 *src, int src_ch, int src_n, int idt_offset, const kemar_ptr& kemar_data, int kemar_idx);
int position, fadeout, fadeout_total;
clunk::Buffer sample3d[2];
float overlap_data[2][WINDOW_SIZE / 2];
};
}
#endif
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