MythTV: pink.h Source File

00001 #ifndef AUDIOPINK
00002 #define AUDIOPINK
00003 
00004 #include "mythexp.h"
00005 
00006 #define PINK_MAX_RANDOM_ROWS   (30)
00007 #define PINK_RANDOM_BITS       (24)
00008 #define PINK_RANDOM_SHIFT      ((sizeof(long)*8)-PINK_RANDOM_BITS)
00009 
00010 typedef struct
00011 {
00012   long      pink_rows[PINK_MAX_RANDOM_ROWS];
00013   long      pink_running_sum;   /* Used to optimize summing of generators. */
00014   int       pink_index;        /* Incremented each sample. */
00015   int       pink_index_mask;    /* Index wrapped by ANDing with this mask. */
00016   float     pink_scalar;       /* Used to scale within range of -1.0 to +1.0 */
00017 } pink_noise_t;
00018 
00019 void initialize_pink_noise( pink_noise_t *pink, int num_rows );
00020 float generate_pink_noise_sample( pink_noise_t *pink );
00021 
00022 #endif