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// Simple audio waveform scope in a window, using SDL multimedia library
#ifndef AUDIO_SCOPE_H
#define AUDIO_SCOPE_H
#include "SDL.h"
class Audio_Scope {
public:
typedef const char* error_t;
// Initialize scope window of specified size. Height must be 256 or less.
error_t init( int width, int height );
// Draw at most 'count' samples from 'in', skipping 'step' samples after
// each sample drawn. Step can be less than 1.0.
error_t draw( const short* in, long count, double step = 1.0 );
Audio_Scope();
~Audio_Scope();
private:
typedef unsigned char byte;
SDL_Surface* screen;
SDL_Surface* surface;
byte* buf;
int buf_size;
int sample_shift;
int low_y;
int high_y;
int v_offset;
void render( short const* in, long count, long step );
};
#endif
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