[FFmpeg-cvslog] avfilter/af_aiir: refactor code so it uses IIRChannel struct
Paul B Mahol
git at videolan.org
Tue Jan 9 18:55:31 EET 2018
ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Tue Jan 9 17:46:27 2018 +0100| [e9edd61965da9d1b907fa2685fa5caec595ad687] | committer: Paul B Mahol
avfilter/af_aiir: refactor code so it uses IIRChannel struct
Signed-off-by: Paul B Mahol <onemda at gmail.com>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e9edd61965da9d1b907fa2685fa5caec595ad687
---
libavfilter/af_aiir.c | 267 ++++++++++++++++++++++++--------------------------
1 file changed, 126 insertions(+), 141 deletions(-)
diff --git a/libavfilter/af_aiir.c b/libavfilter/af_aiir.c
index c805c8e770..0bf9e4f844 100644
--- a/libavfilter/af_aiir.c
+++ b/libavfilter/af_aiir.c
@@ -42,6 +42,15 @@ typedef struct BiquadContext {
double o1, o2;
} BiquadContext;
+typedef struct IIRChannel {
+ int nb_ab[2];
+ double *ab[2];
+ double g;
+ double *cache[2];
+ BiquadContext *biquads;
+ int clippings;
+} IIRChannel;
+
typedef struct AudioIIRContext {
const AVClass *class;
char *a_str, *b_str, *g_str;
@@ -50,12 +59,7 @@ typedef struct AudioIIRContext {
int process;
int precision;
- int *nb_a, *nb_b;
- double **a, **b;
- double *g;
- double **input, **output;
- BiquadContext **biquads;
- int *clippings;
+ IIRChannel *iir;
int channels;
enum AVSampleFormat sample_format;
@@ -103,12 +107,13 @@ static int iir_ch_## name(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
ThreadData *td = arg; \
AVFrame *in = td->in, *out = td->out; \
const type *src = (const type *)in->extended_data[ch]; \
- double *ic = (double *)s->input[ch]; \
- double *oc = (double *)s->output[ch]; \
- const int nb_a = s->nb_a[ch]; \
- const int nb_b = s->nb_b[ch]; \
- const double *a = s->a[ch]; \
- const double *b = s->b[ch]; \
+ double *ic = (double *)s->iir[ch].cache[0]; \
+ double *oc = (double *)s->iir[ch].cache[1]; \
+ const int nb_a = s->iir[ch].nb_ab[0]; \
+ 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]; \
+ int *clippings = &s->iir[ch].clippings; \
type *dst = (type *)out->extended_data[ch]; \
int n; \
\
@@ -128,10 +133,10 @@ static int iir_ch_## name(AVFilterContext *ctx, void *arg, int ch, int nb_jobs)
oc[0] = sample; \
sample *= og; \
if (need_clipping && sample < min) { \
- s->clippings[ch]++; \
+ *clippings++; \
dst[n] = min; \
} else if (need_clipping && sample > max) { \
- s->clippings[ch]++; \
+ *clippings++; \
dst[n] = max; \
} else { \
dst[n] = sample; \
@@ -156,19 +161,21 @@ static int iir_ch_serial_## name(AVFilterContext *ctx, void *arg, int ch, int nb
AVFrame *in = td->in, *out = td->out; \
const type *src = (const type *)in->extended_data[ch]; \
type *dst = (type *)out->extended_data[ch]; \
- int nb_biquads = (FFMAX(s->nb_a[ch], s->nb_b[ch]) + 1) / 2; \
+ IIRChannel *iir = &s->iir[ch]; \
+ 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 = -s->biquads[ch][i].a1; \
- const double a2 = -s->biquads[ch][i].a2; \
- const double b0 = s->biquads[ch][i].b0; \
- const double b1 = s->biquads[ch][i].b1; \
- const double b2 = s->biquads[ch][i].b2; \
- double i1 = s->biquads[ch][i].i1; \
- double i2 = s->biquads[ch][i].i2; \
- double o1 = s->biquads[ch][i].o1; \
- double o2 = s->biquads[ch][i].o2; \
+ 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; \
+ double i1 = iir->biquads[i].i1; \
+ double i2 = iir->biquads[i].i2; \
+ double o1 = iir->biquads[i].o1; \
+ double o2 = iir->biquads[i].o2; \
\
for (n = 0; n < in->nb_samples; n++) { \
double sample = ig * (i ? dst[n] : src[n]); \
@@ -181,19 +188,19 @@ static int iir_ch_serial_## name(AVFilterContext *ctx, void *arg, int ch, int nb
o0 *= og; \
\
if (need_clipping && o0 < min) { \
- s->clippings[ch]++; \
+ *clippings++; \
dst[n] = min; \
} else if (need_clipping && o0 > max) { \
- s->clippings[ch]++; \
+ *clippings++; \
dst[n] = max; \
} else { \
dst[n] = o0; \
} \
} \
- s->biquads[ch][i].i1 = i1; \
- s->biquads[ch][i].i2 = i2; \
- s->biquads[ch][i].o1 = o1; \
- s->biquads[ch][i].o2 = o2; \
+ iir->biquads[i].i1 = i1; \
+ iir->biquads[i].i2 = i2; \
+ iir->biquads[i].o1 = o1; \
+ iir->biquads[i].o2 = o2; \
} \
\
return 0; \
@@ -218,8 +225,9 @@ static void count_coefficients(char *item_str, int *nb_items)
}
}
-static int read_gains(AVFilterContext *ctx, char *item_str, int nb_items, double *dst)
+static int read_gains(AVFilterContext *ctx, char *item_str, int nb_items)
{
+ AudioIIRContext *s = ctx->priv;
char *p, *arg, *old_str, *prev_arg = NULL, *saveptr = NULL;
int i;
@@ -236,7 +244,7 @@ static int read_gains(AVFilterContext *ctx, char *item_str, int nb_items, double
}
p = NULL;
- if (sscanf(arg, "%lf", &dst[i]) != 1) {
+ if (sscanf(arg, "%lf", &s->iir[i].g) != 1) {
av_log(ctx, AV_LOG_ERROR, "Invalid gains supplied: %s\n", arg);
av_freep(&old_str);
return AVERROR(EINVAL);
@@ -300,7 +308,7 @@ static int read_zp_coefficients(AVFilterContext *ctx, char *item_str, int nb_ite
return 0;
}
-static int read_channels(AVFilterContext *ctx, int channels, uint8_t *item_str, int *nb, double **c, double **cache)
+static int read_channels(AVFilterContext *ctx, int channels, uint8_t *item_str, int ab)
{
AudioIIRContext *s = ctx->priv;
char *p, *arg, *old_str, *prev_arg = NULL, *saveptr = NULL;
@@ -310,6 +318,8 @@ static int read_channels(AVFilterContext *ctx, int channels, uint8_t *item_str,
if (!p)
return AVERROR(ENOMEM);
for (i = 0; i < channels; i++) {
+ IIRChannel *iir = &s->iir[i];
+
if (!(arg = av_strtok(p, "|", &saveptr)))
arg = prev_arg;
@@ -318,20 +328,20 @@ static int read_channels(AVFilterContext *ctx, int channels, uint8_t *item_str,
return AVERROR(EINVAL);
}
- count_coefficients(arg, &nb[i]);
+ count_coefficients(arg, &iir->nb_ab[ab]);
p = NULL;
- cache[i] = av_calloc(nb[i] + 1, sizeof(double));
- c[i] = av_calloc(nb[i] * (s->format + 1), sizeof(double));
- if (!c[i] || !cache[i]) {
+ iir->cache[ab] = av_calloc(iir->nb_ab[ab] + 1, sizeof(double));
+ iir->ab[ab] = av_calloc(iir->nb_ab[ab] * (s->format + 1), sizeof(double));
+ if (!iir->ab[ab] || !iir->cache[ab]) {
av_freep(&old_str);
return AVERROR(ENOMEM);
}
if (s->format) {
- ret = read_zp_coefficients(ctx, arg, nb[i], c[i]);
+ ret = read_zp_coefficients(ctx, arg, iir->nb_ab[ab], iir->ab[ab]);
} else {
- ret = read_tf_coefficients(ctx, arg, nb[i], c[i]);
+ ret = read_tf_coefficients(ctx, arg, iir->nb_ab[ab], iir->ab[ab]);
}
if (ret < 0) {
av_freep(&old_str);
@@ -397,36 +407,37 @@ static int convert_zp2tf(AVFilterContext *ctx, int channels)
int ch, i, j, ret;
for (ch = 0; ch < channels; ch++) {
+ IIRChannel *iir = &s->iir[ch];
double *topc, *botc;
- topc = av_calloc((s->nb_b[ch] + 1) * 2, sizeof(*topc));
- botc = av_calloc((s->nb_a[ch] + 1) * 2, sizeof(*botc));
+ topc = av_calloc((iir->nb_ab[0] + 1) * 2, sizeof(*topc));
+ botc = av_calloc((iir->nb_ab[1] + 1) * 2, sizeof(*botc));
if (!topc || !botc)
return AVERROR(ENOMEM);
- ret = expand(ctx, s->a[ch], s->nb_a[ch], botc);
+ ret = expand(ctx, iir->ab[0], iir->nb_ab[0], botc);
if (ret < 0) {
av_free(topc);
av_free(botc);
return ret;
}
- ret = expand(ctx, s->b[ch], s->nb_b[ch], topc);
+ ret = expand(ctx, iir->ab[1], iir->nb_ab[1], topc);
if (ret < 0) {
av_free(topc);
av_free(botc);
return ret;
}
- for (j = 0, i = s->nb_b[ch]; i >= 0; j++, i--) {
- s->b[ch][j] = topc[2 * i];
+ for (j = 0, i = iir->nb_ab[1]; i >= 0; j++, i--) {
+ iir->ab[1][j] = topc[2 * i];
}
- s->nb_b[ch]++;
+ iir->nb_ab[1]++;
- for (j = 0, i = s->nb_a[ch]; i >= 0; j++, i--) {
- s->a[ch][j] = botc[2 * i];
+ for (j = 0, i = iir->nb_ab[0]; i >= 0; j++, i--) {
+ iir->ab[0][j] = botc[2 * i];
}
- s->nb_a[ch]++;
+ iir->nb_ab[0]++;
av_free(topc);
av_free(botc);
@@ -441,11 +452,12 @@ static int decompose_zp2biquads(AVFilterContext *ctx, int channels)
int ch, ret;
for (ch = 0; ch < channels; ch++) {
- int nb_biquads = (FFMAX(s->nb_a[ch], s->nb_b[ch]) + 1) / 2;
+ IIRChannel *iir = &s->iir[ch];
+ int nb_biquads = (FFMAX(iir->nb_ab[0], iir->nb_ab[1]) + 1) / 2;
int current_biquad = 0;
- s->biquads[ch] = av_calloc(nb_biquads, sizeof(BiquadContext));
- if (!s->biquads[ch])
+ iir->biquads = av_calloc(nb_biquads, sizeof(BiquadContext));
+ if (!iir->biquads)
return AVERROR(ENOMEM);
while (nb_biquads--) {
@@ -459,12 +471,12 @@ static int decompose_zp2biquads(AVFilterContext *ctx, int channels)
double max_mag = 0;
int i;
- for (i = 0; i < s->nb_a[ch]; i++) {
+ for (i = 0; i < iir->nb_ab[0]; i++) {
double mag;
- if (isnan(s->a[ch][2 * i]) || isnan(s->a[ch][2 * i + 1]))
+ if (isnan(iir->ab[0][2 * i]) || isnan(iir->ab[0][2 * i + 1]))
continue;
- mag = hypot(s->a[ch][2 * i], s->a[ch][2 * i + 1]);
+ mag = hypot(iir->ab[0][2 * i], iir->ab[0][2 * i + 1]);
if (mag > max_mag) {
max_mag = mag;
@@ -472,12 +484,12 @@ static int decompose_zp2biquads(AVFilterContext *ctx, int channels)
}
}
- for (i = 0; i < s->nb_a[ch]; i++) {
- if (isnan(s->a[ch][2 * i]) || isnan(s->a[ch][2 * i + 1]))
+ for (i = 0; i < iir->nb_ab[1]; i++) {
+ if (isnan(iir->ab[0][2 * i]) || isnan(iir->ab[0][2 * i + 1]))
continue;
- if (s->a[ch][2 * i ] == s->a[ch][2 * outmost_pole.a ] &&
- s->a[ch][2 * i + 1] == -s->a[ch][2 * outmost_pole.a + 1]) {
+ if (iir->ab[0][2 * i ] == iir->ab[0][2 * outmost_pole.a ] &&
+ iir->ab[0][2 * i + 1] == -iir->ab[0][2 * outmost_pole.a + 1]) {
outmost_pole.b = i;
break;
}
@@ -488,13 +500,13 @@ static int decompose_zp2biquads(AVFilterContext *ctx, int channels)
if (outmost_pole.a < 0 || outmost_pole.b < 0)
return AVERROR(EINVAL);
- for (i = 0; i < s->nb_b[ch]; i++) {
+ for (i = 0; i < iir->nb_ab[1]; i++) {
double distance;
- if (isnan(s->b[ch][2 * i]) || isnan(s->b[ch][2 * i + 1]))
+ if (isnan(iir->ab[1][2 * i]) || isnan(iir->ab[1][2 * i + 1]))
continue;
- distance = hypot(s->a[ch][2 * outmost_pole.a ] - s->b[ch][2 * i ],
- s->a[ch][2 * outmost_pole.a + 1] - s->b[ch][2 * i + 1]);
+ distance = hypot(iir->ab[0][2 * outmost_pole.a ] - iir->ab[1][2 * i ],
+ iir->ab[0][2 * outmost_pole.a + 1] - iir->ab[1][2 * i + 1]);
if (distance < min_distance) {
min_distance = distance;
@@ -502,12 +514,12 @@ static int decompose_zp2biquads(AVFilterContext *ctx, int channels)
}
}
- for (i = 0; i < s->nb_b[ch]; i++) {
- if (isnan(s->b[ch][2 * i]) || isnan(s->b[ch][2 * i + 1]))
+ for (i = 0; i < iir->nb_ab[1]; i++) {
+ if (isnan(iir->ab[1][2 * i]) || isnan(iir->ab[1][2 * i + 1]))
continue;
- if (s->b[ch][2 * i ] == s->b[ch][2 * nearest_zero.a ] &&
- s->b[ch][2 * i + 1] == -s->b[ch][2 * nearest_zero.a + 1]) {
+ if (iir->ab[1][2 * i ] == iir->ab[1][2 * nearest_zero.a ] &&
+ iir->ab[1][2 * i + 1] == -iir->ab[1][2 * nearest_zero.a + 1]) {
nearest_zero.b = i;
break;
}
@@ -518,11 +530,11 @@ static int decompose_zp2biquads(AVFilterContext *ctx, int channels)
if (nearest_zero.a < 0 || nearest_zero.b < 0)
return AVERROR(EINVAL);
- poles[0] = s->a[ch][2 * outmost_pole.a ];
- poles[1] = s->a[ch][2 * outmost_pole.a + 1];
+ poles[0] = iir->ab[0][2 * outmost_pole.a ];
+ poles[1] = iir->ab[0][2 * outmost_pole.a + 1];
- zeros[0] = s->b[ch][2 * nearest_zero.a ];
- zeros[1] = s->b[ch][2 * nearest_zero.a + 1];
+ zeros[0] = iir->ab[1][2 * nearest_zero.a ];
+ zeros[1] = iir->ab[1][2 * nearest_zero.a + 1];
if (nearest_zero.a == nearest_zero.b && outmost_pole.a == outmost_pole.b) {
zeros[2] = 0;
@@ -531,11 +543,11 @@ static int decompose_zp2biquads(AVFilterContext *ctx, int channels)
poles[2] = 0;
poles[3] = 0;
} else {
- poles[2] = s->a[ch][2 * outmost_pole.b ];
- poles[3] = s->a[ch][2 * outmost_pole.b + 1];
+ poles[2] = iir->ab[0][2 * outmost_pole.b ];
+ poles[3] = iir->ab[0][2 * outmost_pole.b + 1];
- zeros[2] = s->b[ch][2 * nearest_zero.b ];
- zeros[3] = s->b[ch][2 * nearest_zero.b + 1];
+ zeros[2] = iir->ab[1][2 * nearest_zero.b ];
+ zeros[3] = iir->ab[1][2 * nearest_zero.b + 1];
}
ret = expand(ctx, zeros, 2, b);
@@ -546,25 +558,25 @@ static int decompose_zp2biquads(AVFilterContext *ctx, int channels)
if (ret < 0)
return ret;
- s->a[ch][2 * outmost_pole.a] = s->a[ch][2 * outmost_pole.a + 1] = NAN;
- s->a[ch][2 * outmost_pole.b] = s->a[ch][2 * outmost_pole.b + 1] = NAN;
- s->b[ch][2 * nearest_zero.a] = s->b[ch][2 * nearest_zero.a + 1] = NAN;
- s->b[ch][2 * nearest_zero.b] = s->b[ch][2 * nearest_zero.b + 1] = NAN;
+ iir->ab[0][2 * outmost_pole.a] = iir->ab[0][2 * outmost_pole.a + 1] = NAN;
+ iir->ab[0][2 * outmost_pole.b] = iir->ab[0][2 * outmost_pole.b + 1] = NAN;
+ 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;
- s->biquads[ch][current_biquad].a0 = 1.0;
- s->biquads[ch][current_biquad].a1 = a[2] / a[4];
- s->biquads[ch][current_biquad].a2 = a[0] / a[4];
- s->biquads[ch][current_biquad].b0 = b[4] / a[4] * (current_biquad ? 1.0 : s->g[ch]);
- s->biquads[ch][current_biquad].b1 = b[2] / a[4] * (current_biquad ? 1.0 : s->g[ch]);
- s->biquads[ch][current_biquad].b2 = b[0] / a[4] * (current_biquad ? 1.0 : s->g[ch]);
+ 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",
- s->biquads[ch][current_biquad].a0,
- s->biquads[ch][current_biquad].a1,
- s->biquads[ch][current_biquad].a2,
- s->biquads[ch][current_biquad].b0,
- s->biquads[ch][current_biquad].b1,
- s->biquads[ch][current_biquad].b2);
+ 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);
current_biquad++;
}
@@ -581,26 +593,19 @@ static int config_output(AVFilterLink *outlink)
int ch, ret, i;
s->channels = inlink->channels;
- s->a = av_calloc(inlink->channels, sizeof(*s->a));
- s->b = av_calloc(inlink->channels, sizeof(*s->b));
- s->g = av_calloc(inlink->channels, sizeof(*s->g));
- s->nb_a = av_calloc(inlink->channels, sizeof(*s->nb_a));
- s->nb_b = av_calloc(inlink->channels, sizeof(*s->nb_b));
- s->input = av_calloc(inlink->channels, sizeof(*s->input));
- s->output = av_calloc(inlink->channels, sizeof(*s->output));
- s->clippings = av_calloc(inlink->channels, sizeof(*s->clippings));
- if (!s->a || !s->b || !s->nb_a || !s->nb_b || !s->input || !s->output || !s->clippings)
+ s->iir = av_calloc(s->channels, sizeof(*s->iir));
+ if (!s->iir)
return AVERROR(ENOMEM);
- ret = read_gains(ctx, s->g_str, inlink->channels, s->g);
+ ret = read_gains(ctx, s->g_str, inlink->channels);
if (ret < 0)
return ret;
- ret = read_channels(ctx, inlink->channels, s->a_str, s->nb_a, s->a, s->output);
+ ret = read_channels(ctx, inlink->channels, s->a_str, 0);
if (ret < 0)
return ret;
- ret = read_channels(ctx, inlink->channels, s->b_str, s->nb_b, s->b, s->input);
+ ret = read_channels(ctx, inlink->channels, s->b_str, 1);
if (ret < 0)
return ret;
@@ -620,21 +625,20 @@ static int config_output(AVFilterLink *outlink)
if (inlink->format == AV_SAMPLE_FMT_S16P)
av_log(ctx, AV_LOG_WARNING, "Serial cascading is not recommended for i16 precision.\n");
- s->biquads = av_calloc(inlink->channels, sizeof(*s->biquads));
- if (!s->biquads)
- return AVERROR(ENOMEM);
ret = decompose_zp2biquads(ctx, inlink->channels);
if (ret < 0)
return ret;
}
for (ch = 0; ch < inlink->channels; ch++) {
- for (i = 1; i < s->nb_a[ch]; i++) {
- s->a[ch][i] /= s->a[ch][0];
+ IIRChannel *iir = &s->iir[ch];
+
+ for (i = 1; i < iir->nb_ab[0]; i++) {
+ iir->ab[0][i] /= iir->ab[0][0];
}
- for (i = 0; i < s->nb_b[ch]; i++) {
- s->b[ch][i] *= s->g[ch] / s->a[ch][0];
+ for (i = 0; i < iir->nb_ab[1]; i++) {
+ iir->ab[1][i] *= iir->g / iir->ab[0][0];
}
}
@@ -673,9 +677,10 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
ctx->internal->execute(ctx, s->iir_channel, &td, NULL, outlink->channels);
for (ch = 0; ch < outlink->channels; ch++) {
- if (s->clippings[ch] > 0)
- av_log(ctx, AV_LOG_WARNING, "Channel %d clipping %d times. Please reduce gain.\n", ch, s->clippings[ch]);
- s->clippings[ch] = 0;
+ if (s->iir[ch].clippings > 0)
+ av_log(ctx, AV_LOG_WARNING, "Channel %d clipping %d times. Please reduce gain.\n",
+ ch, s->iir[ch].clippings);
+ s->iir[ch].clippings = 0;
}
if (in != out)
@@ -709,37 +714,17 @@ static av_cold void uninit(AVFilterContext *ctx)
AudioIIRContext *s = ctx->priv;
int ch;
- if (s->a) {
+ if (s->iir) {
for (ch = 0; ch < s->channels; ch++) {
- av_freep(&s->a[ch]);
- av_freep(&s->output[ch]);
+ IIRChannel *iir = &s->iir[ch];
+ av_freep(&iir->ab[0]);
+ av_freep(&iir->ab[1]);
+ av_freep(&iir->cache[0]);
+ av_freep(&iir->cache[1]);
+ av_freep(&iir->biquads);
}
}
- av_freep(&s->a);
-
- if (s->b) {
- for (ch = 0; ch < s->channels; ch++) {
- av_freep(&s->b[ch]);
- av_freep(&s->input[ch]);
- }
- }
- av_freep(&s->b);
-
- av_freep(&s->g);
- av_freep(&s->clippings);
-
- av_freep(&s->input);
- av_freep(&s->output);
-
- if (s->biquads) {
- for (ch = 0; ch < s->channels; ch++) {
- av_freep(&s->biquads[ch]);
- }
- }
- av_freep(&s->biquads);
-
- av_freep(&s->nb_a);
- av_freep(&s->nb_b);
+ av_freep(&s->iir);
}
static const AVFilterPad inputs[] = {
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