2 files changed, 16 insertions, 28 deletions

diff --git a/audio/filter/af.c b/audio/filter/af.c
index f425cb40e3..4c7d2e9bf5 100644
--- a/audio/filter/af.c
+++ b/audio/filter/af.c
@@ -704,16 +704,6 @@ struct mp_audio *af_play(struct af_stream *s, struct mp_audio *data)
     return data;
 }
 
-/* Calculate the minimum output buffer size for given input data d
- * when using the RESIZE_LOCAL_BUFFER macro. The +t+1 part ensures the
- * value is >= len*mul rounded upwards to whole samples even if the
- * double 'mul' is inexact. */
-int af_lencalc(double mul, struct mp_audio *d)
-{
-    int t = d->bps * d->nch;
-    return d->len * mul + t + 1;
-}
-
 // Calculate average ratio of filter output size to input size
 double af_calc_filter_multiplier(struct af_stream *s)
 {
@@ -742,10 +732,23 @@ double af_calc_delay(struct af_stream *s)
     return delay;
 }
 
-/* Helper function called by the macro with the same name this
-   function should not be called directly */
+/* Calculate the minimum output buffer size for given input data d
+ * when using the af_resize_local_buffer function. The +t+1 part ensures the
+ * value is >= len*mul rounded upwards to whole samples even if the
+ * double 'mul' is inexact. */
+static int af_lencalc(double mul, struct mp_audio *d)
+{
+    int t = d->bps * d->nch;
+    return d->len * mul + t + 1;
+}
+
+/* I a local buffer is used (i.e. if the filter doesn't operate on the incoming
+ * buffer), this macro must be called to ensure the buffer is big enough. */
 int af_resize_local_buffer(struct af_instance *af, struct mp_audio *data)
 {
+    if (af->data->len >= af_lencalc(af->mul, data))
+        return AF_OK;
+
     // Calculate new length
     register int len = af_lencalc(af->mul, data);
     mp_msg(MSGT_AFILTER, MSGL_V, "[libaf] Reallocating memory in module %s, "
diff --git a/audio/filter/af.h b/audio/filter/af.h
index dc776460aa..3cfdee85dd 100644
--- a/audio/filter/af.h
+++ b/audio/filter/af.h
@@ -182,14 +182,9 @@ double af_calc_delay(struct af_stream *s);
  * \{
  */
 
-/* Helper function called by the macro with the same name only to be
-   called from inside filters */
 int af_resize_local_buffer(struct af_instance *af, struct mp_audio *data);
 
-/* Helper function used to calculate the exact buffer length needed
-   when buffers are resized. The returned length is >= than what is
-   needed */
-int af_lencalc(double mul, struct mp_audio *data);
+#define RESIZE_LOCAL_BUFFER af_resize_local_buffer
 
 /**
  * \brief convert dB to gain value
@@ -253,14 +248,4 @@ int af_test_output(struct af_instance *af, struct mp_audio *out);
  */
 float af_softclip(float a);
 
-/** \} */ // end of af_filter group, but more functions of this group below
-
-/** Memory reallocation macro: if a local buffer is used (i.e. if the
-   filter doesn't operate on the incoming buffer this macro must be
-   called to ensure the buffer is big enough.
- * \ingroup af_filter
- */
-#define RESIZE_LOCAL_BUFFER(a, d) \
-    ((a->data->len < af_lencalc(a->mul, d)) ? af_resize_local_buffer(a, d) : AF_OK)
-
 #endif /* MPLAYER_AF_H */