From a1c029bab56c826d5311132e8d303c8ef502ec36 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Sebastian=20Dr=C3=B6ge?= <slomo@circular-chaos.org>
Date: Sun, 12 Aug 2007 12:46:20 +0000
Subject: [PATCH] gst/filter/: Reset the residue in BaseTransform::start to get
 a clean residue on stream changes.

Original commit message from CVS:
* gst/filter/gstbpwsinc.c: (gst_bpwsinc_class_init),
(bpwsinc_start):
* gst/filter/gstlpwsinc.c: (gst_lpwsinc_class_init),
(lpwsinc_start):
Reset the residue in BaseTransform::start to get a clean residue
on stream changes.
---
 gst/audiofx/audiowsincband.c  | 21 ++++++++++++++++++++-
 gst/audiofx/audiowsinclimit.c | 20 +++++++++++++++++++-
 2 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/gst/audiofx/audiowsincband.c b/gst/audiofx/audiowsincband.c
index 9d550ba..f2bfda7 100644
--- a/gst/audiofx/audiowsincband.c
+++ b/gst/audiofx/audiowsincband.c
@@ -148,6 +148,8 @@ static GstFlowReturn bpwsinc_transform (GstBaseTransform * base,
     GstBuffer * inbuf, GstBuffer * outbuf);
 static gboolean bpwsinc_get_unit_size (GstBaseTransform * base, GstCaps * caps,
     guint * size);
+static gboolean bpwsinc_start (GstBaseTransform * base);
+
 static gboolean bpwsinc_setup (GstAudioFilter * base,
     GstRingBufferSpec * format);
 
@@ -190,9 +192,11 @@ gst_bpwsinc_class_init (GstBPWSincClass * klass)
 {
   GObjectClass *gobject_class;
   GstBaseTransformClass *trans_class;
+  GstAudioFilterClass *filter_class;
 
   gobject_class = (GObjectClass *) klass;
   trans_class = (GstBaseTransformClass *) klass;
+  filter_class = (GstAudioFilterClass *) klass;
 
   gobject_class->set_property = bpwsinc_set_property;
   gobject_class->get_property = bpwsinc_get_property;
@@ -223,7 +227,8 @@ gst_bpwsinc_class_init (GstBPWSincClass * klass)
 
   trans_class->transform = GST_DEBUG_FUNCPTR (bpwsinc_transform);
   trans_class->get_unit_size = GST_DEBUG_FUNCPTR (bpwsinc_get_unit_size);
-  GST_AUDIO_FILTER_CLASS (klass)->setup = GST_DEBUG_FUNCPTR (bpwsinc_setup);
+  trans_class->start = GST_DEBUG_FUNCPTR (bpwsinc_start);
+  filter_class->setup = GST_DEBUG_FUNCPTR (bpwsinc_setup);
 }
 
 static void
@@ -508,6 +513,20 @@ bpwsinc_transform (GstBaseTransform * base, GstBuffer * inbuf,
   return GST_FLOW_OK;
 }
 
+static gboolean
+bpwsinc_start (GstBaseTransform * base)
+{
+  GstBPWSinc *self = GST_BPWSINC (base);
+  gint channels = GST_AUDIO_FILTER (self)->format.channels;
+
+  /* Reset the residue if already existing */
+  if (channels && self->residue)
+    memset (self->residue, 0, channels *
+        self->kernel_length * sizeof (gdouble));
+
+  return TRUE;
+}
+
 static void
 bpwsinc_set_property (GObject * object, guint prop_id, const GValue * value,
     GParamSpec * pspec)
diff --git a/gst/audiofx/audiowsinclimit.c b/gst/audiofx/audiowsinclimit.c
index 54ebc2a..55daaf7 100644
--- a/gst/audiofx/audiowsinclimit.c
+++ b/gst/audiofx/audiowsinclimit.c
@@ -146,6 +146,7 @@ static GstFlowReturn lpwsinc_transform (GstBaseTransform * base,
     GstBuffer * inbuf, GstBuffer * outbuf);
 static gboolean lpwsinc_get_unit_size (GstBaseTransform * base, GstCaps * caps,
     guint * size);
+static gboolean lpwsinc_start (GstBaseTransform * base);
 static gboolean lpwsinc_setup (GstAudioFilter * base,
     GstRingBufferSpec * format);
 
@@ -188,9 +189,11 @@ gst_lpwsinc_class_init (GstLPWSincClass * klass)
 {
   GObjectClass *gobject_class;
   GstBaseTransformClass *trans_class;
+  GstAudioFilterClass *filter_class;
 
   gobject_class = (GObjectClass *) klass;
   trans_class = (GstBaseTransformClass *) klass;
+  filter_class = (GstAudioFilterClass *) klass;
 
   gobject_class->set_property = lpwsinc_set_property;
   gobject_class->get_property = lpwsinc_get_property;
@@ -218,7 +221,8 @@ gst_lpwsinc_class_init (GstLPWSincClass * klass)
 
   trans_class->transform = GST_DEBUG_FUNCPTR (lpwsinc_transform);
   trans_class->get_unit_size = GST_DEBUG_FUNCPTR (lpwsinc_get_unit_size);
-  GST_AUDIO_FILTER_CLASS (klass)->setup = GST_DEBUG_FUNCPTR (lpwsinc_setup);
+  trans_class->start = GST_DEBUG_FUNCPTR (lpwsinc_start);
+  filter_class->setup = GST_DEBUG_FUNCPTR (lpwsinc_setup);
 }
 
 static void
@@ -444,6 +448,20 @@ lpwsinc_transform (GstBaseTransform * base, GstBuffer * inbuf,
   return GST_FLOW_OK;
 }
 
+static gboolean
+lpwsinc_start (GstBaseTransform * base)
+{
+  GstLPWSinc *self = GST_LPWSINC (base);
+  gint channels = GST_AUDIO_FILTER (self)->format.channels;
+
+  /* Reset the residue if already existing */
+  if (channels && self->residue)
+    memset (self->residue, 0, channels *
+        self->kernel_length * sizeof (gdouble));
+
+  return TRUE;
+}
+
 static void
 lpwsinc_set_property (GObject * object, guint prop_id, const GValue * value,
     GParamSpec * pspec)
-- 
2.7.4