static void draw_response(AVFilterContext *ctx, AVFrame *out)
{
AudioIIRContext *s = ctx->priv;
- float *mag, *phase, min = FLT_MAX, max = FLT_MIN;
- int prev_ymag = -1, prev_yphase = -1;
+ float *mag, *phase, *delay, min = FLT_MAX, max = FLT_MIN;
+ float min_delay = FLT_MAX, max_delay = FLT_MIN;
+ int prev_ymag = -1, prev_yphase = -1, prev_ydelay = -1;
char text[32];
int ch, i, x;
phase = av_malloc_array(s->w, sizeof(*phase));
mag = av_malloc_array(s->w, sizeof(*mag));
- if (!mag || !phase)
+ delay = av_malloc_array(s->w, sizeof(*delay));
+ if (!mag || !phase || !delay)
goto end;
ch = av_clip(s->ir_channel, 0, s->channels - 1);
max = fmaxf(max, mag[i]);
}
+ for (i = 0; i < s->w - 1; i++) {
+ float dw = M_PI / (s->w - 1);
+
+ delay[i] = -(phase[i + 1] - phase[i]) / dw;
+ min_delay = fminf(min_delay, delay[i]);
+ max_delay = fmaxf(max_delay, delay[i]);
+ }
+
+ delay[i] = delay[i - 1];
+
for (i = 0; i < s->w; i++) {
int ymag = mag[i] / max * (s->h - 1);
+ int ydelay = (delay[i] - min_delay) / (max_delay - min_delay) * (s->h - 1);
int yphase = (0.5 * (1. + phase[i] / M_PI)) * (s->h - 1);
ymag = s->h - 1 - av_clip(ymag, 0, s->h - 1);
yphase = s->h - 1 - av_clip(yphase, 0, s->h - 1);
+ ydelay = s->h - 1 - av_clip(ydelay, 0, s->h - 1);
if (prev_ymag < 0)
prev_ymag = ymag;
if (prev_yphase < 0)
prev_yphase = yphase;
+ if (prev_ydelay < 0)
+ prev_ydelay = ydelay;
draw_line(out, i, ymag, FFMAX(i - 1, 0), prev_ymag, 0xFFFF00FF);
draw_line(out, i, yphase, FFMAX(i - 1, 0), prev_yphase, 0xFF00FF00);
+ draw_line(out, i, ydelay, FFMAX(i - 1, 0), prev_ydelay, 0xFF00FFFF);
prev_ymag = ymag;
prev_yphase = yphase;
+ prev_ydelay = ydelay;
}
if (s->w > 400 && s->h > 100) {
drawtext(out, 2, 12, "Min Magnitude:", 0xDDDDDDDD);
snprintf(text, sizeof(text), "%.2f", min);
drawtext(out, 15 * 8 + 2, 12, text, 0xDDDDDDDD);
+
+ drawtext(out, 2, 22, "Max Delay:", 0xDDDDDDDD);
+ snprintf(text, sizeof(text), "%.2f", max_delay);
+ drawtext(out, 11 * 8 + 2, 22, text, 0xDDDDDDDD);
+
+ drawtext(out, 2, 32, "Min Delay:", 0xDDDDDDDD);
+ snprintf(text, sizeof(text), "%.2f", min_delay);
+ drawtext(out, 11 * 8 + 2, 32, text, 0xDDDDDDDD);
}
end:
+ av_free(delay);
av_free(phase);
av_free(mag);
}