alsa-utils/speaker-test/pink.h

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#define PINK_MAX_RANDOM_ROWS (30)
#define PINK_RANDOM_BITS (24)
#define PINK_RANDOM_SHIFT ((sizeof(long)*8)-PINK_RANDOM_BITS)
typedef struct
{
long pink_rows[PINK_MAX_RANDOM_ROWS];
long pink_running_sum; /* Used to optimize summing of generators. */
int pink_index; /* Incremented each sample. */
int pink_index_mask; /* Index wrapped by ANDing with this mask. */
float pink_scalar; /* Used to scale within range of -1.0 to +1.0 */
} pink_noise_t;
void initialize_pink_noise( pink_noise_t *pink, int num_rows );
float generate_pink_noise_sample( pink_noise_t *pink );