Audio_Scope.h

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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