From d5bc4ee79864404423ddf2786d8e8089fc46eeca Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Mon, 18 Nov 2013 14:18:37 +0100
Subject: audio: drop buffered filter data when seeking

This could lead to (barely) audible artifacts with --af=scaletempo and
modified playback speed.
---
 audio/filter/af_lavrresample.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'audio/filter/af_lavrresample.c')

diff --git a/audio/filter/af_lavrresample.c b/audio/filter/af_lavrresample.c
index f659511f82..95a5547ab5 100644
--- a/audio/filter/af_lavrresample.c
+++ b/audio/filter/af_lavrresample.c
@@ -93,11 +93,19 @@ static int get_delay(struct af_resample *s)
 {
     return avresample_get_delay(s->avrctx);
 }
+static void drop_all_output(struct af_resample *s)
+{
+    while (avresample_read(s->avrctx, NULL, 1000) > 0) {}
+}
 #else
 static int get_delay(struct af_resample *s)
 {
     return swr_get_delay(s->avrctx, s->ctx.in_rate);
 }
+static void drop_all_output(struct af_resample *s)
+{
+    while (swr_drop_output(s->avrctx, 1000) > 0) {}
+}
 #endif
 
 static double af_resample_default_cutoff(int filter_size)
@@ -273,6 +281,9 @@ static int control(struct af_instance *af, int cmd, void *arg)
     case AF_CONTROL_SET_RESAMPLE_RATE:
         out->rate = *(int *)arg;
         return AF_OK;
+    case AF_CONTROL_RESET:
+        drop_all_output(s);
+        return AF_OK;
     }
     return AF_UNKNOWN;
 }
-- 
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