diff --git a/libavfilter/af_biquads.c b/libavfilter/af_biquads.c
index a6f9fbca0c..a6e34fd011 100644
--- a/libavfilter/af_biquads.c
+++ b/libavfilter/af_biquads.c
@@ -111,7 +111,7 @@ typedef struct {
 
     ChanCache *cache;
 
-    void (*filter)(const void *ibuf, void *obuf, int len,
+    void (*filter)(AVFilterContext *ctx, const void *ibuf, void *obuf, int len,
                    double *i1, double *i2, double *o1, double *o2,
                    double b0, double b1, double b2, double a1, double a2);
 } BiquadsContext;
@@ -165,7 +165,8 @@ static int query_formats(AVFilterContext *ctx)
 }
 
 #define BIQUAD_FILTER(name, type, min, max, need_clipping)                    \
-static void biquad_## name (const void *input, void *output, int len,         \
+static void biquad_## name (AVFilterContext *ctx,                             \
+                            const void *input, void *output, int len,         \
                             double *in1, double *in2,                         \
                             double *out1, double *out2,                       \
                             double b0, double b1, double b2,                  \
@@ -185,10 +186,10 @@ static void biquad_## name (const void *input, void *output, int len,         \
         o2 = i2 * b2 + i1 * b1 + ibuf[i] * b0 + o2 * a2 + o1 * a1;            \
         i2 = ibuf[i];                                                         \
         if (need_clipping && o2 < min) {                                      \
-            av_log(NULL, AV_LOG_WARNING, "clipping\n");                       \
+            av_log(ctx, AV_LOG_WARNING, "clipping\n");                        \
             obuf[i] = min;                                                    \
         } else if (need_clipping && o2 > max) {                               \
-            av_log(NULL, AV_LOG_WARNING, "clipping\n");                       \
+            av_log(ctx, AV_LOG_WARNING, "clipping\n");                        \
             obuf[i] = max;                                                    \
         } else {                                                              \
             obuf[i] = o2;                                                     \
@@ -197,10 +198,10 @@ static void biquad_## name (const void *input, void *output, int len,         \
         o1 = i1 * b2 + i2 * b1 + ibuf[i] * b0 + o1 * a2 + o2 * a1;            \
         i1 = ibuf[i];                                                         \
         if (need_clipping && o1 < min) {                                      \
-            av_log(NULL, AV_LOG_WARNING, "clipping\n");                       \
+            av_log(ctx, AV_LOG_WARNING, "clipping\n");                        \
             obuf[i] = min;                                                    \
         } else if (need_clipping && o1 > max) {                               \
-            av_log(NULL, AV_LOG_WARNING, "clipping\n");                       \
+            av_log(ctx, AV_LOG_WARNING, "clipping\n");                        \
             obuf[i] = max;                                                    \
         } else {                                                              \
             obuf[i] = o1;                                                     \
@@ -213,10 +214,10 @@ static void biquad_## name (const void *input, void *output, int len,         \
         o2 = o1;                                                              \
         o1 = o0;                                                              \
         if (need_clipping && o0 < min) {                                      \
-            av_log(NULL, AV_LOG_WARNING, "clipping\n");                       \
+            av_log(ctx, AV_LOG_WARNING, "clipping\n");                        \
             obuf[i] = min;                                                    \
         } else if (need_clipping && o0 > max) {                               \
-            av_log(NULL, AV_LOG_WARNING, "clipping\n");                       \
+            av_log(ctx, AV_LOG_WARNING, "clipping\n");                        \
             obuf[i] = max;                                                    \
         } else {                                                              \
             obuf[i] = o0;                                                     \
@@ -391,8 +392,9 @@ static int config_output(AVFilterLink *outlink)
 
 static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
 {
-    BiquadsContext *s       = inlink->dst->priv;
-    AVFilterLink *outlink   = inlink->dst->outputs[0];
+    AVFilterContext  *ctx = inlink->dst;
+    BiquadsContext *s     = ctx->priv;
+    AVFilterLink *outlink = ctx->outputs[0];
     AVFrame *out_buf;
     int nb_samples = buf->nb_samples;
     int ch;
@@ -409,7 +411,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
     }
 
     for (ch = 0; ch < av_frame_get_channels(buf); ch++)
-        s->filter(buf->extended_data[ch],
+        s->filter(ctx, buf->extended_data[ch],
                   out_buf->extended_data[ch], nb_samples,
                   &s->cache[ch].i1, &s->cache[ch].i2,
                   &s->cache[ch].o1, &s->cache[ch].o2,