Add volume control and rms/peak level signals

Signed-off-by: Sjoerd Simons <sjoerd.simons@collabora.co.uk>

svn path=/trunk/; revision=2560

2 files changed, 269 insertions, 12 deletions

diff --git a/libempathy-gtk/empathy-audio-src.c b/libempathy-gtk/empathy-audio-src.c
index c7437e93e..c3e11095c 100644
--- a/libempathy-gtk/empathy-audio-src.c
+++ b/libempathy-gtk/empathy-audio-src.c
@@ -22,19 +22,26 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include <gst/farsight/fs-element-added-notifier.h>
 #include "empathy-audio-src.h"
 
 G_DEFINE_TYPE(EmpathyGstAudioSrc, empathy_audio_src, GST_TYPE_BIN)
 
 /* signal enum */
-#if 0
 enum
 {
+    PEAK_LEVEL_CHANGED,
+    RMS_LEVEL_CHANGED,
     LAST_SIGNAL
 };
 
 static guint signals[LAST_SIGNAL] = {0};
-#endif
+
+enum {
+    PROP_VOLUME = 1,
+    PROP_RMS_LEVEL,
+    PROP_PEAK_LEVEL,
+};
 
 /* private structure */
 typedef struct _EmpathyGstAudioSrcPrivate EmpathyGstAudioSrcPrivate;
@@ -43,6 +50,15 @@ struct _EmpathyGstAudioSrcPrivate
 {
   gboolean dispose_has_run;
   GstElement *src;
+  GstElement *volume;
+  GstElement *level;
+  FsElementAddedNotifier *notifier;
+
+  gdouble peak_level;
+  gdouble rms_level;
+
+  GMutex *lock;
+  guint idle_id;
 };
 
 #define EMPATHY_GST_AUDIO_SRC_GET_PRIVATE(o) \
@@ -50,23 +66,56 @@ struct _EmpathyGstAudioSrcPrivate
   EmpathyGstAudioSrcPrivate))
 
 static void
+empathy_audio_src_element_added_cb (FsElementAddedNotifier *notifier,
+  GstBin *bin, GstElement *element, EmpathyGstAudioSrc *self)
+{
+  EmpathyGstAudioSrcPrivate *priv = EMPATHY_GST_AUDIO_SRC_GET_PRIVATE (self);
+
+  if (g_object_class_find_property (G_OBJECT_GET_CLASS (element), "volume"))
+    {
+      gdouble volume;
+
+      volume = empathy_audio_src_get_volume (self);
+      empathy_audio_src_set_volume (self, 1.0);
+
+      if (priv->volume != NULL)
+        g_object_unref (priv->volume);
+      priv->volume = g_object_ref (element);
+
+      if (volume != 1.0)
+        empathy_audio_src_set_volume (self, volume);
+    }
+}
+
+static void
 empathy_audio_src_init (EmpathyGstAudioSrc *obj)
 {
   EmpathyGstAudioSrcPrivate *priv = EMPATHY_GST_AUDIO_SRC_GET_PRIVATE (obj);
-  //GstElement *resample;
   GstPad *ghost, *src;
 
-  /* allocate any data required by the object here */
-  //resample = gst_element_factory_make ("audioresample", NULL);
+  priv->peak_level = -G_MAXDOUBLE;
+  priv->lock = g_mutex_new ();
+
+  priv->notifier = fs_element_added_notifier_new ();
+  g_signal_connect (priv->notifier, "element-added",
+    G_CALLBACK (empathy_audio_src_element_added_cb), obj);
 
   priv->src = gst_element_factory_make ("gconfaudiosrc", NULL);
+  gst_bin_add (GST_BIN (obj), priv->src);
+
+  fs_element_added_notifier_add (priv->notifier, GST_BIN (priv->src));
+
+  priv->volume = gst_element_factory_make ("volume", NULL);
+  g_object_ref (priv->volume);
 
-  //gst_bin_add_many (GST_BIN (obj), priv->src, resample, NULL);
-  gst_bin_add_many (GST_BIN (obj), priv->src, NULL);
-  //gst_element_link_many (priv->src, resample, NULL);
+  gst_bin_add (GST_BIN (obj), priv->volume);
+  gst_element_link (priv->src, priv->volume);
 
-  //src = gst_element_get_static_pad (resample, "src");
-  src = gst_element_get_static_pad (priv->src, "src");
+  priv->level = gst_element_factory_make ("level", NULL);
+  gst_bin_add (GST_BIN (obj), priv->level);
+  gst_element_link (priv->volume, priv->level);
+
+  src = gst_element_get_static_pad (priv->level, "src");
 
   ghost = gst_ghost_pad_new ("src", src);
   gst_element_add_pad (GST_ELEMENT (obj), ghost);
@@ -76,18 +125,105 @@ empathy_audio_src_init (EmpathyGstAudioSrc *obj)
 
 static void empathy_audio_src_dispose (GObject *object);
 static void empathy_audio_src_finalize (GObject *object);
+static void empathy_audio_src_handle_message (GstBin *bin,
+  GstMessage *message);
+
+static gboolean empathy_audio_src_levels_updated (gpointer user_data);
+
+static void
+empathy_audio_src_set_property (GObject *object,
+  guint property_id, const GValue *value, GParamSpec *pspec)
+{
+  switch (property_id)
+    {
+      case PROP_VOLUME:
+        empathy_audio_src_set_volume (EMPATHY_GST_AUDIO_SRC (object),
+          g_value_get_double (value));
+        break;
+      default:
+        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+    }
+}
+
+static void
+empathy_audio_src_get_property (GObject *object,
+  guint property_id, GValue *value, GParamSpec *pspec)
+{
+  EmpathyGstAudioSrc *self = EMPATHY_GST_AUDIO_SRC (object);
+  EmpathyGstAudioSrcPrivate *priv = EMPATHY_GST_AUDIO_SRC_GET_PRIVATE (self);
+
+  switch (property_id)
+    {
+      case PROP_VOLUME:
+        g_value_set_double (value,
+          empathy_audio_src_get_volume (self));
+        break;
+      case PROP_PEAK_LEVEL:
+        g_mutex_lock (priv->lock);
+        g_value_set_double (value, priv->peak_level);
+        g_mutex_unlock (priv->lock);
+        break;
+      case PROP_RMS_LEVEL:
+        g_mutex_lock (priv->lock);
+        g_value_set_double (value, priv->rms_level);
+        g_mutex_unlock (priv->lock);
+        break;
+      default:
+        G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+    }
+}
 
 static void
 empathy_audio_src_class_init (EmpathyGstAudioSrcClass
   *empathy_audio_src_class)
 {
   GObjectClass *object_class = G_OBJECT_CLASS (empathy_audio_src_class);
+  GstBinClass *gstbin_class = GST_BIN_CLASS (empathy_audio_src_class);
+  GParamSpec *param_spec;
 
   g_type_class_add_private (empathy_audio_src_class,
     sizeof (EmpathyGstAudioSrcPrivate));
 
   object_class->dispose = empathy_audio_src_dispose;
   object_class->finalize = empathy_audio_src_finalize;
+
+  object_class->set_property = empathy_audio_src_set_property;
+  object_class->get_property = empathy_audio_src_get_property;
+
+  gstbin_class->handle_message =
+    GST_DEBUG_FUNCPTR (empathy_audio_src_handle_message);
+
+  param_spec = g_param_spec_double ("volume", "Volume", "volume contol",
+    0.0, 5.0, 1.0,
+    G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
+  g_object_class_install_property (object_class, PROP_VOLUME, param_spec);
+
+  param_spec = g_param_spec_double ("peak-level", "peak level", "peak level",
+    -G_MAXDOUBLE, G_MAXDOUBLE, 0,
+    G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
+  g_object_class_install_property (object_class, PROP_VOLUME, param_spec);
+
+  signals[PEAK_LEVEL_CHANGED] = g_signal_new ("peak-level-changed",
+    G_TYPE_FROM_CLASS (empathy_audio_src_class),
+    G_SIGNAL_RUN_LAST,
+    0,
+    NULL, NULL,
+    g_cclosure_marshal_VOID__DOUBLE,
+    G_TYPE_NONE, 1, G_TYPE_DOUBLE);
+
+  param_spec = g_param_spec_double ("rms-level", "RMS level", "RMS level",
+    -G_MAXDOUBLE, G_MAXDOUBLE, 0,
+    G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
+  g_object_class_install_property (object_class, PROP_VOLUME, param_spec);
+
+
+  signals[RMS_LEVEL_CHANGED] = g_signal_new ("rms-level-changed",
+    G_TYPE_FROM_CLASS (empathy_audio_src_class),
+    G_SIGNAL_RUN_LAST,
+    0,
+    NULL, NULL,
+    g_cclosure_marshal_VOID__DOUBLE,
+    G_TYPE_NONE, 1, G_TYPE_DOUBLE);
 }
 
 void
@@ -101,6 +237,11 @@ empathy_audio_src_dispose (GObject *object)
 
   priv->dispose_has_run = TRUE;
 
+  if (priv->idle_id != 0)
+    g_source_remove (priv->idle_id);
+
+  priv->idle_id = 0;
+
   /* release any references held by the object here */
 
   if (G_OBJECT_CLASS (empathy_audio_src_parent_class)->dispose)
@@ -110,16 +251,129 @@ empathy_audio_src_dispose (GObject *object)
 void
 empathy_audio_src_finalize (GObject *object)
 {
-  //EmpathyGstAudioSrc *self = EMPATHY_GST_AUDIO_SRC (object);
-  //EmpathyGstAudioSrcPrivate *priv = EMPATHY_GST_AUDIO_SRC_GET_PRIVATE (self);
+  EmpathyGstAudioSrc *self = EMPATHY_GST_AUDIO_SRC (object);
+  EmpathyGstAudioSrcPrivate *priv = EMPATHY_GST_AUDIO_SRC_GET_PRIVATE (self);
 
   /* free any data held directly by the object here */
+  g_mutex_free (priv->lock);
 
   G_OBJECT_CLASS (empathy_audio_src_parent_class)->finalize (object);
 }
 
+static gboolean
+empathy_audio_src_levels_updated (gpointer user_data)
+{
+  EmpathyGstAudioSrc *self = EMPATHY_GST_AUDIO_SRC (user_data);
+  EmpathyGstAudioSrcPrivate *priv = EMPATHY_GST_AUDIO_SRC_GET_PRIVATE (self);
+
+  g_mutex_lock (priv->lock);
+
+  g_signal_emit (self, signals[PEAK_LEVEL_CHANGED], 0, priv->peak_level);
+  g_signal_emit (self, signals[RMS_LEVEL_CHANGED], 0, priv->rms_level);
+  priv->idle_id = 0;
+
+  g_mutex_unlock (priv->lock);
+
+  return FALSE;
+}
+
+static void
+empathy_audio_src_handle_message (GstBin *bin, GstMessage *message)
+{
+  EmpathyGstAudioSrc *self = EMPATHY_GST_AUDIO_SRC (bin);
+  EmpathyGstAudioSrcPrivate *priv = EMPATHY_GST_AUDIO_SRC_GET_PRIVATE (self);
+
+  if  (GST_MESSAGE_TYPE (message) == GST_MESSAGE_ELEMENT &&
+        GST_MESSAGE_SRC (message) == GST_OBJECT (priv->level))
+    {
+      const GstStructure *s;
+      const gchar *name;
+      const GValue *list;
+      guint i, len;
+      gdouble peak = -G_MAXDOUBLE;
+      gdouble rms = -G_MAXDOUBLE;
+
+
+      s = gst_message_get_structure (message);
+      name = gst_structure_get_name (s);
+
+      if (g_strcmp0 ("level", name) != 0)
+        goto out;
+
+      list = gst_structure_get_value (s, "peak");
+      len = gst_value_list_get_size (list);
+
+      for (i =0 ; i < len; i++)
+        {
+          const GValue *value;
+          gdouble db;
+
+          value = gst_value_list_get_value (list, i);
+          db = g_value_get_double (value);
+          peak = MAX (db, peak);
+        }
+
+      list = gst_structure_get_value (s, "rms");
+      len = gst_value_list_get_size (list);
+
+      for (i =0 ; i < len; i++)
+        {
+          const GValue *value;
+          gdouble db;
+
+          value = gst_value_list_get_value (list, i);
+          db = g_value_get_double (value);
+          rms = MAX (db, rms);
+        }
+
+      g_mutex_lock (priv->lock);
+
+      priv->peak_level = peak;
+      priv->rms_level = rms;
+      if (priv->idle_id == 0)
+        priv->idle_id = g_idle_add (empathy_audio_src_levels_updated, self);
+
+      g_mutex_unlock (priv->lock);
+    }
+
+out:
+   GST_BIN_CLASS (empathy_audio_src_parent_class)->handle_message (bin,
+    message);
+}
+
 GstElement *
 empathy_audio_src_new (void)
 {
   return GST_ELEMENT (g_object_new (EMPATHY_TYPE_GST_AUDIO_SRC, NULL));
 }
+
+void
+empathy_audio_src_set_volume (EmpathyGstAudioSrc *src, gdouble volume)
+{
+  EmpathyGstAudioSrcPrivate *priv = EMPATHY_GST_AUDIO_SRC_GET_PRIVATE (src);
+  GParamSpec *pspec;
+  GParamSpecDouble *pspec_double;
+
+  pspec = g_object_class_find_property (G_OBJECT_GET_CLASS (priv->volume),
+    "volume");
+
+  g_assert (pspec != NULL);
+
+  pspec_double = G_PARAM_SPEC_DOUBLE (pspec);
+
+  volume = CLAMP (volume, pspec_double->minimum, pspec_double->maximum);
+
+  g_object_set (G_OBJECT (priv->volume), "volume", volume, NULL);
+}
+
+gdouble
+empathy_audio_src_get_volume (EmpathyGstAudioSrc *src)
+{
+  EmpathyGstAudioSrcPrivate *priv = EMPATHY_GST_AUDIO_SRC_GET_PRIVATE (src);
+  gdouble volume;
+
+
+  g_object_get (G_OBJECT (priv->volume), "volume", &volume, NULL);
+
+  return volume;
+}
diff --git a/libempathy-gtk/empathy-audio-src.h b/libempathy-gtk/empathy-audio-src.h
index 7a68bbe15..4f48fe1f7 100644
--- a/libempathy-gtk/empathy-audio-src.h
+++ b/libempathy-gtk/empathy-audio-src.h
@@ -58,6 +58,9 @@ GType empathy_audio_src_get_type (void);
 
 GstElement *empathy_audio_src_new (void);
 
+void empathy_audio_src_set_volume (EmpathyGstAudioSrc *src, gdouble volume);
+gdouble empathy_audio_src_get_volume (EmpathyGstAudioSrc *src);
+
 G_END_DECLS
 
 #endif /* #ifndef __EMPATHY_GST_AUDIO_SRC_H__*/