} Pair;
typedef struct BiquadContext {
- double a0, a1, a2;
- double b0, b1, b2;
+ double a[3];
+ double b[3];
double i1, i2;
double o1, o2;
} BiquadContext;
const AVClass *class;
char *a_str, *b_str, *g_str;
double dry_gain, wet_gain;
+ double mix;
int format;
int process;
int precision;
int response;
int w, h;
int ir_channel;
+ AVRational rate;
AVFrame *video;
AudioIIRContext *s = ctx->priv; \
const double ig = s->dry_gain; \
const double og = s->wet_gain; \
+ const double mix = s->mix; \
ThreadData *td = arg; \
AVFrame *in = td->in, *out = td->out; \
const type *src = (const type *)in->extended_data[ch]; \
const int nb_b = s->iir[ch].nb_ab[1]; \
const double *a = s->iir[ch].ab[0]; \
const double *b = s->iir[ch].ab[1]; \
+ const double g = s->iir[ch].g; \
int *clippings = &s->iir[ch].clippings; \
type *dst = (type *)out->extended_data[ch]; \
int n; \
sample -= a[x] * oc[x]; \
\
oc[0] = sample; \
- sample *= og; \
+ sample *= og * g; \
+ sample = sample * mix + ic[0] * (1. - mix); \
if (need_clipping && sample < min) { \
(*clippings)++; \
dst[n] = min; \
AudioIIRContext *s = ctx->priv; \
const double ig = s->dry_gain; \
const double og = s->wet_gain; \
+ const double mix = s->mix; \
ThreadData *td = arg; \
AVFrame *in = td->in, *out = td->out; \
const type *src = (const type *)in->extended_data[ch]; \
type *dst = (type *)out->extended_data[ch]; \
IIRChannel *iir = &s->iir[ch]; \
+ const double g = iir->g; \
int *clippings = &iir->clippings; \
int nb_biquads = (FFMAX(iir->nb_ab[0], iir->nb_ab[1]) + 1) / 2; \
int n, i; \
\
for (i = 0; i < nb_biquads; i++) { \
- const double a1 = -iir->biquads[i].a1; \
- const double a2 = -iir->biquads[i].a2; \
- const double b0 = iir->biquads[i].b0; \
- const double b1 = iir->biquads[i].b1; \
- const double b2 = iir->biquads[i].b2; \
+ const double a1 = -iir->biquads[i].a[1]; \
+ const double a2 = -iir->biquads[i].a[2]; \
+ const double b0 = iir->biquads[i].b[0]; \
+ const double b1 = iir->biquads[i].b[1]; \
+ const double b2 = iir->biquads[i].b[2]; \
double i1 = iir->biquads[i].i1; \
double i2 = iir->biquads[i].i2; \
double o1 = iir->biquads[i].o1; \
i1 = src[n]; \
o2 = o1; \
o1 = o0; \
- o0 *= og; \
+ o0 *= og * g; \
\
+ o0 = o0 * mix + (1. - mix) * sample; \
if (need_clipping && o0 < min) { \
(*clippings)++; \
dst[n] = min; \
for (i = 0; i < nb + 1; i++) {
if (fabs(coeffs[2 * i + 1]) > FLT_EPSILON) {
- av_log(ctx, AV_LOG_ERROR, "coeff: %lf of z^%d is not real; poles/zeros are not complex conjugates.\n",
+ av_log(ctx, AV_LOG_ERROR, "coeff: %f of z^%d is not real; poles/zeros are not complex conjugates.\n",
coeffs[2 * i + 1], i);
return AVERROR(EINVAL);
}
double a[6] = { 0 };
double min_distance = DBL_MAX;
double max_mag = 0;
+ double factor;
int i;
for (i = 0; i < iir->nb_ab[0]; i++) {
}
}
- for (i = 0; i < iir->nb_ab[1]; i++) {
+ for (i = 0; i < iir->nb_ab[0]; i++) {
if (isnan(iir->ab[0][2 * i]) || isnan(iir->ab[0][2 * i + 1]))
continue;
iir->ab[1][2 * nearest_zero.a] = iir->ab[1][2 * nearest_zero.a + 1] = NAN;
iir->ab[1][2 * nearest_zero.b] = iir->ab[1][2 * nearest_zero.b + 1] = NAN;
- iir->biquads[current_biquad].a0 = 1.0;
- iir->biquads[current_biquad].a1 = a[2] / a[4];
- iir->biquads[current_biquad].a2 = a[0] / a[4];
- iir->biquads[current_biquad].b0 = b[4] / a[4] * (current_biquad ? 1.0 : iir->g);
- iir->biquads[current_biquad].b1 = b[2] / a[4] * (current_biquad ? 1.0 : iir->g);
- iir->biquads[current_biquad].b2 = b[0] / a[4] * (current_biquad ? 1.0 : iir->g);
-
- av_log(ctx, AV_LOG_VERBOSE, "a=%lf %lf %lf:b=%lf %lf %lf\n",
- iir->biquads[current_biquad].a0,
- iir->biquads[current_biquad].a1,
- iir->biquads[current_biquad].a2,
- iir->biquads[current_biquad].b0,
- iir->biquads[current_biquad].b1,
- iir->biquads[current_biquad].b2);
+ iir->biquads[current_biquad].a[0] = 1.;
+ iir->biquads[current_biquad].a[1] = a[2] / a[4];
+ iir->biquads[current_biquad].a[2] = a[0] / a[4];
+ iir->biquads[current_biquad].b[0] = b[4] / a[4];
+ iir->biquads[current_biquad].b[1] = b[2] / a[4];
+ iir->biquads[current_biquad].b[2] = b[0] / a[4];
+
+ if (fabs(iir->biquads[current_biquad].b[0] +
+ iir->biquads[current_biquad].b[1] +
+ iir->biquads[current_biquad].b[2]) > 1e-6) {
+ factor = (iir->biquads[current_biquad].a[0] +
+ iir->biquads[current_biquad].a[1] +
+ iir->biquads[current_biquad].a[2]) /
+ (iir->biquads[current_biquad].b[0] +
+ iir->biquads[current_biquad].b[1] +
+ iir->biquads[current_biquad].b[2]);
+
+ av_log(ctx, AV_LOG_VERBOSE, "factor=%f\n", factor);
+
+ iir->biquads[current_biquad].b[0] *= factor;
+ iir->biquads[current_biquad].b[1] *= factor;
+ iir->biquads[current_biquad].b[2] *= factor;
+ }
+
+ iir->biquads[current_biquad].b[0] *= (current_biquad ? 1.0 : iir->g);
+ iir->biquads[current_biquad].b[1] *= (current_biquad ? 1.0 : iir->g);
+ iir->biquads[current_biquad].b[2] *= (current_biquad ? 1.0 : iir->g);
+
+ av_log(ctx, AV_LOG_VERBOSE, "a=%f %f %f:b=%f %f %f\n",
+ iir->biquads[current_biquad].a[0],
+ iir->biquads[current_biquad].a[1],
+ iir->biquads[current_biquad].a[2],
+ iir->biquads[current_biquad].b[0],
+ iir->biquads[current_biquad].b[1],
+ iir->biquads[current_biquad].b[2]);
current_biquad++;
}
}
}
+static void check_stability(AVFilterContext *ctx, int channels)
+{
+ AudioIIRContext *s = ctx->priv;
+ int ch;
+
+ for (ch = 0; ch < channels; ch++) {
+ IIRChannel *iir = &s->iir[ch];
+
+ for (int n = 0; n < iir->nb_ab[0]; n++) {
+ double pr = hypot(iir->ab[0][2*n], iir->ab[0][2*n+1]);
+
+ if (pr >= 1.) {
+ av_log(ctx, AV_LOG_WARNING, "pole %d at channel %d is unstable\n", n, ch);
+ break;
+ }
+ }
+ }
+}
+
static void drawtext(AVFrame *pic, int x, int y, const char *txt, uint32_t color)
{
const uint8_t *font;
}
}
+static void get_response(int channel, int format, double w,
+ const double *b, const double *a,
+ int nb_b, int nb_a, double *r, double *i)
+{
+ double realz, realp;
+ double imagz, imagp;
+ double real, imag;
+ double div;
+
+ if (format == 0) {
+ realz = 0., realp = 0.;
+ imagz = 0., imagp = 0.;
+ for (int x = 0; x < nb_a; x++) {
+ realz += cos(-x * w) * a[x];
+ imagz += sin(-x * w) * a[x];
+ }
+
+ for (int x = 0; x < nb_b; x++) {
+ realp += cos(-x * w) * b[x];
+ imagp += sin(-x * w) * b[x];
+ }
+
+ div = realp * realp + imagp * imagp;
+ real = (realz * realp + imagz * imagp) / div;
+ imag = (imagz * realp - imagp * realz) / div;
+ } else {
+ real = 1;
+ imag = 0;
+ for (int x = 0; x < nb_a; x++) {
+ double ore, oim, re, im;
+
+ re = cos(w) - a[2 * x];
+ im = sin(w) - a[2 * x + 1];
+
+ ore = real;
+ oim = imag;
+
+ real = ore * re - oim * im;
+ imag = ore * im + oim * re;
+ }
+
+ for (int x = 0; x < nb_b; x++) {
+ double ore, oim, re, im;
+
+ re = cos(w) - b[2 * x];
+ im = sin(w) - b[2 * x + 1];
+
+ ore = real;
+ oim = imag;
+ div = re * re + im * im;
+
+ real = (ore * re + oim * im) / div;
+ imag = (oim * re - ore * im) / div;
+ }
+ }
+
+ *r = real;
+ *i = imag;
+}
+
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;
+ int ch, i;
memset(out->data[0], 0, s->h * out->linesize[0]);
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);
for (i = 0; i < s->w; i++) {
const double *b = s->iir[ch].ab[0];
const double *a = s->iir[ch].ab[1];
+ const int nb_b = s->iir[ch].nb_ab[0];
+ const int nb_a = s->iir[ch].nb_ab[1];
double w = i * M_PI / (s->w - 1);
- double realz, realp;
- double imagz, imagp;
- double real, imag, div;
-
- if (s->format == 0) {
- realz = 0., realp = 0.;
- imagz = 0., imagp = 0.;
- for (x = 0; x < s->iir[ch].nb_ab[1]; x++) {
- realz += cos(-x * w) * a[x];
- imagz += sin(-x * w) * a[x];
- }
-
- for (x = 0; x < s->iir[ch].nb_ab[0]; x++) {
- realp += cos(-x * w) * b[x];
- imagp += sin(-x * w) * b[x];
- }
-
- div = realp * realp + imagp * imagp;
- real = (realz * realp + imagz * imagp) / div;
- imag = (imagz * realp - imagp * realz) / div;
- } else {
- real = 1;
- imag = 0;
- for (x = 0; x < s->iir[ch].nb_ab[1]; x++) {
- double ore, oim, re, im;
-
- re = cos(w) - a[2 * x];
- im = sin(w) - a[2 * x + 1];
-
- ore = real;
- oim = imag;
-
- real = ore * re - oim * im;
- imag = ore * im + oim * re;
- }
-
- for (x = 0; x < s->iir[ch].nb_ab[0]; x++) {
- double ore, oim, re, im;
-
- re = cos(w) - b[2 * x];
- im = sin(w) - b[2 * x + 1];
+ double real, imag;
- ore = real;
- oim = imag;
- div = re * re + im * im;
-
- real = (ore * re + oim * im) / div;
- imag = (oim * re - ore * im) / div;
- }
- }
+ get_response(ch, s->format, w, b, a, nb_b, nb_a, &real, &imag);
mag[i] = s->iir[ch].g * hypot(real, imag);
phase[i] = atan2(imag, real);
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);
}
} else if (s->format == 3) {
convert_pd2zp(ctx, inlink->channels);
}
+ if (s->format > 0) {
+ check_stability(ctx, inlink->channels);
+ }
av_frame_free(&s->video);
if (s->response) {
if (s->response) {
AVFilterLink *outlink = ctx->outputs[1];
+ int64_t old_pts = s->video->pts;
+ int64_t new_pts = av_rescale_q(out->pts, ctx->inputs[0]->time_base, outlink->time_base);
- s->video->pts = out->pts;
- ret = ff_filter_frame(outlink, av_frame_clone(s->video));
- if (ret < 0)
- return ret;
+ if (new_pts > old_pts) {
+ s->video->pts = new_pts;
+ ret = ff_filter_frame(outlink, av_frame_clone(s->video));
+ if (ret < 0)
+ return ret;
+ }
}
return ff_filter_frame(outlink, out);
outlink->sample_aspect_ratio = (AVRational){1,1};
outlink->w = s->w;
outlink->h = s->h;
+ outlink->frame_rate = s->rate;
+ outlink->time_base = av_inv_q(outlink->frame_rate);
return 0;
}
{ "flt", "single-precision floating-point", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, AF, "precision" },
{ "i32", "32-bit integers", 0, AV_OPT_TYPE_CONST, {.i64=2}, 0, 0, AF, "precision" },
{ "i16", "16-bit integers", 0, AV_OPT_TYPE_CONST, {.i64=3}, 0, 0, AF, "precision" },
+ { "mix", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, AF },
{ "response", "show IR frequency response", OFFSET(response), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, VF },
{ "channel", "set IR channel to display frequency response", OFFSET(ir_channel), AV_OPT_TYPE_INT, {.i64=0}, 0, 1024, VF },
{ "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "hd720"}, 0, 0, VF },
+ { "rate", "set video rate", OFFSET(rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT32_MAX, VF },
{ NULL },
};
projects / ffmpeg / blobdiff