diff -r 71e347f905f2 -r 4a7fac7dd34a gst_plugins_good/gst/audiofx/audiopanorama.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gst_plugins_good/gst/audiofx/audiopanorama.c	Fri Apr 16 15:15:52 2010 +0300
@@ -0,0 +1,648 @@
+/*
+ * GStreamer
+ * Copyright (C) 2006 Stefan Kost <ensonic@users.sf.net>
+ * Copyright (C) 2006 Sebastian Dröge <slomo@circular-chaos.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+/**
+ * SECTION:element-audiopanorama
+ *
+ * Stereo panorama effect with controllable pan position. One can choose between the default psychoacoustic panning method,
+ * which keeps the same perceived loudness, and a simple panning method that just controls the volume on one channel.
+ *
+ * <refsect2>
+ * <title>Example launch line</title>
+ * |[
+ * gst-launch audiotestsrc wave=saw ! audiopanorama panorama=-1.00 ! alsasink
+ * gst-launch filesrc location="melo1.ogg" ! oggdemux ! vorbisdec ! audioconvert ! audiopanorama panorama=-1.00 ! alsasink
+ * gst-launch audiotestsrc wave=saw ! audioconvert ! audiopanorama panorama=-1.00 ! audioconvert ! alsasink
+ * gst-launch audiotestsrc wave=saw ! audioconvert ! audiopanorama method=simple panorama=-0.50 ! audioconvert ! alsasink
+ * ]|
+ * </refsect2>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gst/gst.h>
+#include <gst/base/gstbasetransform.h>
+#include <gst/controller/gstcontroller.h>
+
+#include "audiopanorama.h"
+
+#define GST_CAT_DEFAULT gst_audio_panorama_debug
+GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
+
+static const GstElementDetails element_details =
+GST_ELEMENT_DETAILS ("Stereo positioning",
+    "Filter/Effect/Audio",
+    "Positions audio streams in the stereo panorama",
+    "Stefan Kost <ensonic@users.sf.net>");
+
+/* Filter signals and args */
+enum
+{
+  /* FILL ME */
+  LAST_SIGNAL
+};
+
+enum
+{
+  PROP_0,
+  PROP_PANORAMA,
+  PROP_METHOD
+};
+
+enum
+{
+  METHOD_PSYCHOACOUSTIC = 0,
+  METHOD_SIMPLE,
+  NUM_METHODS
+};
+
+#define GST_TYPE_AUDIO_PANORAMA_METHOD (gst_audio_panorama_method_get_type ())
+static GType
+gst_audio_panorama_method_get_type (void)
+{
+  static GType gtype = 0;
+
+  if (gtype == 0) {
+    static const GEnumValue values[] = {
+      {METHOD_PSYCHOACOUSTIC, "Psychoacoustic Panning (default)",
+          "psychoacoustic"},
+      {METHOD_SIMPLE, "Simple Panning", "simple"},
+      {0, NULL, NULL}
+    };
+
+    gtype = g_enum_register_static ("GstAudioPanoramaMethod", values);
+  }
+  return gtype;
+}
+
+static GstStaticPadTemplate sink_template = GST_STATIC_PAD_TEMPLATE ("sink",
+    GST_PAD_SINK,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("audio/x-raw-float, "
+        "rate = (int) [ 1, MAX ], "
+        "channels = (int) [ 1, 2 ], "
+        "endianness = (int) BYTE_ORDER, " "width = (int) 32; "
+        "audio/x-raw-int, "
+        "rate = (int) [ 1, MAX ], "
+        "channels = (int) [ 1, 2 ], "
+        "endianness = (int) BYTE_ORDER, "
+        "width = (int) 16, " "depth = (int) 16, " "signed = (boolean) true")
+    );
+
+static GstStaticPadTemplate src_template = GST_STATIC_PAD_TEMPLATE ("src",
+    GST_PAD_SRC,
+    GST_PAD_ALWAYS,
+    GST_STATIC_CAPS ("audio/x-raw-float, "
+        "rate = (int) [ 1, MAX ], "
+        "channels = (int) 2, "
+        "endianness = (int) BYTE_ORDER, " "width = (int) 32; "
+        "audio/x-raw-int, "
+        "rate = (int) [ 1, MAX ], "
+        "channels = (int) 2, "
+        "endianness = (int) BYTE_ORDER, "
+        "width = (int) 16, " "depth = (int) 16, " "signed = (boolean) true")
+    );
+
+#define DEBUG_INIT(bla) \
+  GST_DEBUG_CATEGORY_INIT (gst_audio_panorama_debug, "audiopanorama", 0, "audiopanorama element");
+
+GST_BOILERPLATE_FULL (GstAudioPanorama, gst_audio_panorama, GstBaseTransform,
+    GST_TYPE_BASE_TRANSFORM, DEBUG_INIT);
+
+static void gst_audio_panorama_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec);
+static void gst_audio_panorama_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec);
+
+static gboolean gst_audio_panorama_get_unit_size (GstBaseTransform * base,
+    GstCaps * caps, guint * size);
+static GstCaps *gst_audio_panorama_transform_caps (GstBaseTransform * base,
+    GstPadDirection direction, GstCaps * caps);
+static gboolean gst_audio_panorama_set_caps (GstBaseTransform * base,
+    GstCaps * incaps, GstCaps * outcaps);
+
+static void gst_audio_panorama_transform_m2s_int (GstAudioPanorama * filter,
+    gint16 * idata, gint16 * odata, guint num_samples);
+static void gst_audio_panorama_transform_s2s_int (GstAudioPanorama * filter,
+    gint16 * idata, gint16 * odata, guint num_samples);
+static void gst_audio_panorama_transform_m2s_float (GstAudioPanorama * filter,
+    gfloat * idata, gfloat * odata, guint num_samples);
+static void gst_audio_panorama_transform_s2s_float (GstAudioPanorama * filter,
+    gfloat * idata, gfloat * odata, guint num_samples);
+
+static void gst_audio_panorama_transform_m2s_int_simple (GstAudioPanorama *
+    filter, gint16 * idata, gint16 * odata, guint num_samples);
+static void gst_audio_panorama_transform_s2s_int_simple (GstAudioPanorama *
+    filter, gint16 * idata, gint16 * odata, guint num_samples);
+static void gst_audio_panorama_transform_m2s_float_simple (GstAudioPanorama *
+    filter, gfloat * idata, gfloat * odata, guint num_samples);
+static void gst_audio_panorama_transform_s2s_float_simple (GstAudioPanorama *
+    filter, gfloat * idata, gfloat * odata, guint num_samples);
+
+static GstFlowReturn gst_audio_panorama_transform (GstBaseTransform * base,
+    GstBuffer * inbuf, GstBuffer * outbuf);
+
+
+/* Table with processing functions: [channels][format][method] */
+static GstAudioPanoramaProcessFunc panorama_process_functions[2][2][2] = {
+  {
+        {(GstAudioPanoramaProcessFunc) gst_audio_panorama_transform_m2s_int,
+              (GstAudioPanoramaProcessFunc)
+            gst_audio_panorama_transform_m2s_int_simple},
+        {(GstAudioPanoramaProcessFunc) gst_audio_panorama_transform_m2s_float,
+              (GstAudioPanoramaProcessFunc)
+            gst_audio_panorama_transform_m2s_float_simple}
+      },
+  {
+        {(GstAudioPanoramaProcessFunc) gst_audio_panorama_transform_s2s_int,
+              (GstAudioPanoramaProcessFunc)
+            gst_audio_panorama_transform_s2s_int_simple},
+        {(GstAudioPanoramaProcessFunc) gst_audio_panorama_transform_s2s_float,
+              (GstAudioPanoramaProcessFunc)
+            gst_audio_panorama_transform_s2s_float_simple}
+      }
+};
+
+/* GObject vmethod implementations */
+
+static void
+gst_audio_panorama_base_init (gpointer klass)
+{
+  GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&src_template));
+  gst_element_class_add_pad_template (element_class,
+      gst_static_pad_template_get (&sink_template));
+  gst_element_class_set_details (element_class, &element_details);
+}
+
+static void
+gst_audio_panorama_class_init (GstAudioPanoramaClass * klass)
+{
+  GObjectClass *gobject_class;
+
+  gobject_class = (GObjectClass *) klass;
+  gobject_class->set_property = gst_audio_panorama_set_property;
+  gobject_class->get_property = gst_audio_panorama_get_property;
+
+  g_object_class_install_property (gobject_class, PROP_PANORAMA,
+      g_param_spec_float ("panorama", "Panorama",
+          "Position in stereo panorama (-1.0 left -> 1.0 right)", -1.0, 1.0,
+          0.0, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE));
+  /**
+   * GstAudioPanorama:method
+   *
+   * Panning method: psychoacoustic mode keeps the same perceived loudness,
+   * while simple mode just controls the volume of one channel. It's merely
+   * a matter of taste which method should be chosen. 
+   *
+   * Since: 0.10.6
+   **/
+  g_object_class_install_property (gobject_class, PROP_METHOD,
+      g_param_spec_enum ("method", "Panning method",
+          "Psychoacoustic mode keeps same perceived loudness, "
+          "simple mode just controls volume of one channel.",
+          GST_TYPE_AUDIO_PANORAMA_METHOD, METHOD_PSYCHOACOUSTIC,
+          G_PARAM_READWRITE));
+
+  GST_BASE_TRANSFORM_CLASS (klass)->get_unit_size =
+      GST_DEBUG_FUNCPTR (gst_audio_panorama_get_unit_size);
+  GST_BASE_TRANSFORM_CLASS (klass)->transform_caps =
+      GST_DEBUG_FUNCPTR (gst_audio_panorama_transform_caps);
+  GST_BASE_TRANSFORM_CLASS (klass)->set_caps =
+      GST_DEBUG_FUNCPTR (gst_audio_panorama_set_caps);
+  GST_BASE_TRANSFORM_CLASS (klass)->transform =
+      GST_DEBUG_FUNCPTR (gst_audio_panorama_transform);
+}
+
+static void
+gst_audio_panorama_init (GstAudioPanorama * filter,
+    GstAudioPanoramaClass * klass)
+{
+
+  filter->panorama = 0;
+  filter->method = METHOD_PSYCHOACOUSTIC;
+  filter->width = 0;
+  filter->channels = 0;
+  filter->format_float = FALSE;
+  filter->process = NULL;
+
+  gst_base_transform_set_gap_aware (GST_BASE_TRANSFORM (filter), TRUE);
+}
+
+static gboolean
+gst_audio_panorama_set_process_function (GstAudioPanorama * filter)
+{
+  gint channel_index, format_index, method_index;
+
+  /* set processing function */
+  channel_index = filter->channels - 1;
+  if (channel_index > 1 || channel_index < 0) {
+    filter->process = NULL;
+    return FALSE;
+  }
+
+  format_index = (filter->format_float) ? 1 : 0;
+
+  method_index = filter->method;
+  if (method_index >= NUM_METHODS || method_index < 0)
+    method_index = METHOD_PSYCHOACOUSTIC;
+
+  filter->process =
+      panorama_process_functions[channel_index][format_index][method_index];
+  return TRUE;
+}
+
+static void
+gst_audio_panorama_set_property (GObject * object, guint prop_id,
+    const GValue * value, GParamSpec * pspec)
+{
+  GstAudioPanorama *filter = GST_AUDIO_PANORAMA (object);
+
+  switch (prop_id) {
+    case PROP_PANORAMA:
+      filter->panorama = g_value_get_float (value);
+      break;
+    case PROP_METHOD:
+      filter->method = g_value_get_enum (value);
+      gst_audio_panorama_set_process_function (filter);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+static void
+gst_audio_panorama_get_property (GObject * object, guint prop_id,
+    GValue * value, GParamSpec * pspec)
+{
+  GstAudioPanorama *filter = GST_AUDIO_PANORAMA (object);
+
+  switch (prop_id) {
+    case PROP_PANORAMA:
+      g_value_set_float (value, filter->panorama);
+      break;
+    case PROP_METHOD:
+      g_value_set_enum (value, filter->method);
+      break;
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
+      break;
+  }
+}
+
+/* GstBaseTransform vmethod implementations */
+
+static gboolean
+gst_audio_panorama_get_unit_size (GstBaseTransform * base, GstCaps * caps,
+    guint * size)
+{
+  gint width, channels;
+  GstStructure *structure;
+  gboolean ret;
+
+  g_assert (size);
+
+  /* this works for both float and int */
+  structure = gst_caps_get_structure (caps, 0);
+  ret = gst_structure_get_int (structure, "width", &width);
+  ret &= gst_structure_get_int (structure, "channels", &channels);
+
+  *size = width * channels / 8;
+
+  return ret;
+}
+
+static GstCaps *
+gst_audio_panorama_transform_caps (GstBaseTransform * base,
+    GstPadDirection direction, GstCaps * caps)
+{
+  GstCaps *res;
+  GstStructure *structure;
+
+  /* transform caps gives one single caps so we can just replace
+   * the channel property with our range. */
+  res = gst_caps_copy (caps);
+  structure = gst_caps_get_structure (res, 0);
+  if (direction == GST_PAD_SRC) {
+    GST_INFO ("allow 1-2 channels");
+    gst_structure_set (structure, "channels", GST_TYPE_INT_RANGE, 1, 2, NULL);
+  } else {
+    GST_INFO ("allow 2 channels");
+    gst_structure_set (structure, "channels", G_TYPE_INT, 2, NULL);
+  }
+
+  return res;
+}
+
+static gboolean
+gst_audio_panorama_set_caps (GstBaseTransform * base, GstCaps * incaps,
+    GstCaps * outcaps)
+{
+  GstAudioPanorama *filter = GST_AUDIO_PANORAMA (base);
+  const GstStructure *structure;
+  gboolean ret;
+  gint width;
+  const gchar *fmt;
+
+  /*GST_INFO ("incaps are %" GST_PTR_FORMAT, incaps); */
+
+  structure = gst_caps_get_structure (incaps, 0);
+  ret = gst_structure_get_int (structure, "channels", &filter->channels);
+  if (!ret)
+    goto no_channels;
+
+  ret = gst_structure_get_int (structure, "width", &width);
+  if (!ret)
+    goto no_width;
+  filter->width = width / 8;
+
+  fmt = gst_structure_get_name (structure);
+  if (!strcmp (fmt, "audio/x-raw-int"))
+    filter->format_float = FALSE;
+  else
+    filter->format_float = TRUE;
+
+  GST_DEBUG ("try to process %s input with %d channels", fmt, filter->channels);
+
+  ret = gst_audio_panorama_set_process_function (filter);
+
+  if (!ret)
+    GST_WARNING ("can't process input with %d channels", filter->channels);
+
+  return ret;
+
+no_channels:
+  GST_DEBUG ("no channels in caps");
+  return ret;
+no_width:
+  GST_DEBUG ("no width in caps");
+  return ret;
+}
+
+/* psychoacoustic processing functions */
+static void
+gst_audio_panorama_transform_m2s_int (GstAudioPanorama * filter, gint16 * idata,
+    gint16 * odata, guint num_samples)
+{
+  guint i;
+  gdouble val;
+  glong lval, rval;
+  gdouble rpan, lpan;
+
+  /* pan:  -1.0  0.0  1.0
+   * lpan:  1.0  0.5  0.0  
+   * rpan:  0.0  0.5  1.0
+   *
+   * FIXME: we should use -3db (1/sqtr(2)) for 50:50
+   */
+  rpan = (gdouble) (filter->panorama + 1.0) / 2.0;
+  lpan = 1.0 - rpan;
+
+  for (i = 0; i < num_samples; i++) {
+    val = (gdouble) * idata++;
+
+    lval = (glong) (val * lpan);
+    rval = (glong) (val * rpan);
+
+    *odata++ = (gint16) CLAMP (lval, G_MININT16, G_MAXINT16);
+    *odata++ = (gint16) CLAMP (rval, G_MININT16, G_MAXINT16);
+  }
+}
+
+static void
+gst_audio_panorama_transform_s2s_int (GstAudioPanorama * filter, gint16 * idata,
+    gint16 * odata, guint num_samples)
+{
+  guint i;
+  glong lval, rval;
+  gdouble lival, rival;
+  gdouble lrpan, llpan, rrpan, rlpan;
+
+  /* pan:  -1.0  0.0  1.0
+   * llpan: 1.0  1.0  0.0
+   * lrpan: 1.0  0.0  0.0
+   * rrpan: 0.0  1.0  1.0
+   * rlpan: 0.0  0.0  1.0
+   */
+  if (filter->panorama > 0) {
+    rlpan = (gdouble) filter->panorama;
+    llpan = 1.0 - rlpan;
+    lrpan = 0.0;
+    rrpan = 1.0;
+  } else {
+    rrpan = (gdouble) (1.0 + filter->panorama);
+    lrpan = 1.0 - rrpan;
+    rlpan = 0.0;
+    llpan = 1.0;
+  }
+
+  for (i = 0; i < num_samples; i++) {
+    lival = (gdouble) * idata++;
+    rival = (gdouble) * idata++;
+
+    lval = lival * llpan + rival * lrpan;
+    rval = lival * rlpan + rival * rrpan;
+
+    *odata++ = (gint16) CLAMP (lval, G_MININT16, G_MAXINT16);
+    *odata++ = (gint16) CLAMP (rval, G_MININT16, G_MAXINT16);
+  }
+}
+
+static void
+gst_audio_panorama_transform_m2s_float (GstAudioPanorama * filter,
+    gfloat * idata, gfloat * odata, guint num_samples)
+{
+  guint i;
+  gfloat val;
+  gdouble rpan, lpan;
+
+  /* pan:  -1.0  0.0  1.0
+   * lpan:  1.0  0.5  0.0  
+   * rpan:  0.0  0.5  1.0
+   *
+   * FIXME: we should use -3db (1/sqtr(2)) for 50:50
+   */
+  rpan = (gdouble) (filter->panorama + 1.0) / 2.0;
+  lpan = 1.0 - rpan;
+
+  for (i = 0; i < num_samples; i++) {
+    val = *idata++;
+
+    *odata++ = val * lpan;
+    *odata++ = val * rpan;
+  }
+}
+
+static void
+gst_audio_panorama_transform_s2s_float (GstAudioPanorama * filter,
+    gfloat * idata, gfloat * odata, guint num_samples)
+{
+  guint i;
+  gfloat lival, rival;
+  gdouble lrpan, llpan, rrpan, rlpan;
+
+  /* pan:  -1.0  0.0  1.0
+   * llpan: 1.0  1.0  0.0
+   * lrpan: 1.0  0.0  0.0
+   * rrpan: 0.0  1.0  1.0
+   * rlpan: 0.0  0.0  1.0
+   */
+  if (filter->panorama > 0) {
+    rlpan = (gdouble) filter->panorama;
+    llpan = 1.0 - rlpan;
+    lrpan = 0.0;
+    rrpan = 1.0;
+  } else {
+    rrpan = (gdouble) (1.0 + filter->panorama);
+    lrpan = 1.0 - rrpan;
+    rlpan = 0.0;
+    llpan = 1.0;
+  }
+
+  for (i = 0; i < num_samples; i++) {
+    lival = *idata++;
+    rival = *idata++;
+
+    *odata++ = lival * llpan + rival * lrpan;
+    *odata++ = lival * rlpan + rival * rrpan;
+  }
+}
+
+/* simple processing functions */
+static void
+gst_audio_panorama_transform_m2s_int_simple (GstAudioPanorama * filter,
+    gint16 * idata, gint16 * odata, guint num_samples)
+{
+  guint i;
+  gdouble val;
+  glong lval, rval;
+
+  for (i = 0; i < num_samples; i++) {
+    val = (gdouble) * idata++;
+
+    if (filter->panorama > 0.0) {
+      lval = (glong) (val * (1.0 - filter->panorama));
+      rval = (glong) val;
+    } else {
+      lval = (glong) val;
+      rval = (glong) (val * (1.0 + filter->panorama));
+    }
+
+    *odata++ = (gint16) CLAMP (lval, G_MININT16, G_MAXINT16);
+    *odata++ = (gint16) CLAMP (rval, G_MININT16, G_MAXINT16);
+  }
+}
+
+static void
+gst_audio_panorama_transform_s2s_int_simple (GstAudioPanorama * filter,
+    gint16 * idata, gint16 * odata, guint num_samples)
+{
+  guint i;
+  glong lval, rval;
+  gdouble lival, rival;
+
+  for (i = 0; i < num_samples; i++) {
+    lival = (gdouble) * idata++;
+    rival = (gdouble) * idata++;
+
+    if (filter->panorama > 0.0) {
+      lval = (glong) (lival * (1.0 - filter->panorama));
+      rval = (glong) rival;
+    } else {
+      lval = (glong) lival;
+      rval = (glong) (rival * (1.0 + filter->panorama));
+    }
+
+    *odata++ = (gint16) CLAMP (lval, G_MININT16, G_MAXINT16);
+    *odata++ = (gint16) CLAMP (rval, G_MININT16, G_MAXINT16);
+  }
+}
+
+static void
+gst_audio_panorama_transform_m2s_float_simple (GstAudioPanorama * filter,
+    gfloat * idata, gfloat * odata, guint num_samples)
+{
+  guint i;
+  gfloat val;
+
+
+  for (i = 0; i < num_samples; i++) {
+    val = *idata++;
+
+    if (filter->panorama > 0.0) {
+      *odata++ = val * (1.0 - filter->panorama);
+      *odata++ = val;
+    } else {
+      *odata++ = val;
+      *odata++ = val * (1.0 + filter->panorama);
+    }
+  }
+}
+
+static void
+gst_audio_panorama_transform_s2s_float_simple (GstAudioPanorama * filter,
+    gfloat * idata, gfloat * odata, guint num_samples)
+{
+  guint i;
+  gfloat lival, rival;
+
+  for (i = 0; i < num_samples; i++) {
+    lival = *idata++;
+    rival = *idata++;
+
+    if (filter->panorama > 0.0) {
+      *odata++ = lival * (1.0 - filter->panorama);
+      *odata++ = rival;
+    } else {
+      *odata++ = lival;
+      *odata++ = rival * (1.0 + filter->panorama);
+    }
+  }
+}
+
+/* this function does the actual processing
+ */
+static GstFlowReturn
+gst_audio_panorama_transform (GstBaseTransform * base, GstBuffer * inbuf,
+    GstBuffer * outbuf)
+{
+  GstAudioPanorama *filter = GST_AUDIO_PANORAMA (base);
+  guint num_samples = GST_BUFFER_SIZE (outbuf) / (2 * filter->width);
+
+  if (GST_CLOCK_TIME_IS_VALID (GST_BUFFER_TIMESTAMP (outbuf)))
+    gst_object_sync_values (G_OBJECT (filter), GST_BUFFER_TIMESTAMP (outbuf));
+
+  if (G_UNLIKELY (GST_BUFFER_FLAG_IS_SET (inbuf, GST_BUFFER_FLAG_GAP))) {
+    GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_GAP);
+    memset (GST_BUFFER_DATA (outbuf), 0, GST_BUFFER_SIZE (outbuf));
+    return GST_FLOW_OK;
+  }
+
+  filter->process (filter, GST_BUFFER_DATA (inbuf),
+      GST_BUFFER_DATA (outbuf), num_samples);
+
+  return GST_FLOW_OK;
+}