enum DisplayMode { COMBINED, SEPARATE, NB_MODES };
enum DisplayScale { LINEAR, SQRT, CBRT, LOG, NB_SCALES };
enum ColorMode { CHANNEL, INTENSITY, NB_CLMODES };
-enum WindowFunc { WFUNC_NONE, WFUNC_HANN, WFUNC_HAMMING, NB_WFUNC };
+enum WindowFunc { WFUNC_NONE, WFUNC_HANN, WFUNC_HAMMING, WFUNC_BLACKMAN, NB_WFUNC };
typedef struct {
const AVClass *class;
{ "win_func", "set window function", OFFSET(win_func), AV_OPT_TYPE_INT, {.i64 = WFUNC_HANN}, 0, NB_WFUNC-1, FLAGS, "win_func" },
{ "hann", "Hann window", 0, AV_OPT_TYPE_CONST, {.i64 = WFUNC_HANN}, INT_MIN, INT_MAX, FLAGS, "win_func" },
{ "hamming", "Hamming window", 0, AV_OPT_TYPE_CONST, {.i64 = WFUNC_HAMMING}, INT_MIN, INT_MAX, FLAGS, "win_func" },
+ { "blackman", "Blackman window", 0, AV_OPT_TYPE_CONST, {.i64 = WFUNC_BLACKMAN}, INT_MIN, INT_MAX, FLAGS, "win_func" },
{ NULL }
};
for (i = 0; i < win_size; i++)
s->window_func_lut[i] = .54f - .46f * cos(2*M_PI*i / (win_size-1));
break;
+ case WFUNC_BLACKMAN: {
+ for (i = 0; i < win_size; i++)
+ s->window_func_lut[i] = .42f - .5f*cos(2*M_PI*i / (win_size-1)) + .08f*cos(4*M_PI*i / (win_size-1));
+ break;
+ }
default:
av_assert0(0);
}