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#ifndef AUDIOGRAPHER_UTILS_H
#define AUDIOGRAPHER_UTILS_H
#include "types.h"
#include "exception.h"
#include <cstring>
namespace AudioGrapher
{
class Utils
{
public:
static void free_resources();
/// Initialize zero buffer, if buffer is != 0, it will be used as the zero buffer
template <typename T>
static void init_zeros (nframes_t frames, T const * buffer = 0)
{
if (frames == 0) {
throw Exception (Utils(), "init_zeros must be called with an argument greater than zero.");
}
unsigned long n_zeros = frames * sizeof (T);
if (n_zeros <= num_zeros) { return; }
delete [] zeros;
if (buffer) {
zeros = reinterpret_cast<char const *>(buffer);
} else {
zeros = new char[n_zeros];
memset (const_cast<char *>(zeros), 0, n_zeros);
}
num_zeros = n_zeros;
}
template <typename T>
static T const * get_zeros (nframes_t frames)
{
if (frames * sizeof (T) > num_zeros) {
throw Exception (Utils(), "init_zeros has not been called with a large enough frame count");
}
return reinterpret_cast<T const *> (zeros);
}
template <typename T>
static nframes_t get_zero_buffer_size ()
{
return num_zeros / sizeof (T);
}
private:
static char const * zeros;
static unsigned long num_zeros;
};
} // namespace
#endif // AUDIOGRAPHER_ROUTINES_H
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