playback: Add gstplaybackutils.{h,c} to deploy the common subroutines

Bring some of the helper functions in gstplaybin2.c to new files
gstplaybackutils.{h,c} which can be utilized by other files
in gst/playback too.

https://bugzilla.gnome.org/show_bug.cgi?id=687182

4 files changed, 173 insertions, 101 deletions

diff --git a/gst/playback/Makefile.am b/gst/playback/Makefile.am
index cc2c5ce2b..081b22425 100644
--- a/gst/playback/Makefile.am
+++ b/gst/playback/Makefile.am
@@ -13,7 +13,8 @@ libgstplayback_la_SOURCES = \
 	gstplaysinkvideoconvert.c \
 	gstplaysinkaudioconvert.c \
 	gstplaysinkconvertbin.c \
-	gststreamsynchronizer.c
+	gststreamsynchronizer.c \
+	gstplaybackutils.c
 
 nodist_libgstplayback_la_SOURCES = $(built_sources)
 libgstplayback_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_CFLAGS) $(csp_cflags)
@@ -34,7 +35,8 @@ noinst_HEADERS = \
 	gstplaysinkvideoconvert.h \
 	gstplaysinkaudioconvert.h \
 	gstplaysinkconvertbin.h \
-	gststreamsynchronizer.h
+	gststreamsynchronizer.h \
+	gstplaybackutils.h
 
 BUILT_SOURCES = $(built_headers) $(built_sources)
 
diff --git a/gst/playback/gstplaybackutils.c b/gst/playback/gstplaybackutils.c
new file mode 100644
index 000000000..bd6ad7bae
--- /dev/null
+++ b/gst/playback/gstplaybackutils.c
@@ -0,0 +1,129 @@
+/* Copyright (C) <2014> Intel Corporation
+ * Copyright (C) <2014> Sreerenj Balachandran <sreerenj.balachandran@intel.com>
+ *
+ * Author: Sreerenj Balachandran <sreerenj.balachandran@intel.com>
+ *
+ * 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., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gst/gst.h>
+#include "gstplaybackutils.h"
+
+static GstStaticCaps raw_audio_caps = GST_STATIC_CAPS ("audio/x-raw(ANY)");
+static GstStaticCaps raw_video_caps = GST_STATIC_CAPS ("video/x-raw(ANY)");
+
+/* unref the caps after usage */
+static GstCaps *
+get_template_caps (GstElementFactory * factory, GstPadDirection direction)
+{
+  const GList *templates;
+  GstStaticPadTemplate *templ = NULL;
+  GList *walk;
+
+  templates = gst_element_factory_get_static_pad_templates (factory);
+  for (walk = (GList *) templates; walk; walk = g_list_next (walk)) {
+    templ = walk->data;
+    if (templ->direction == direction)
+      break;
+  }
+  if (templ)
+    return gst_static_caps_get (&templ->static_caps);
+  else
+    return NULL;
+}
+
+static gboolean
+is_included (GList * list, GstCapsFeatures * cf)
+{
+  for (; list; list = list->next) {
+    if (gst_caps_features_is_equal ((GstCapsFeatures *) list->data, cf))
+      return TRUE;
+  }
+  return FALSE;
+}
+
+/* compute the number of common caps features */
+guint
+gst_playback_utils_get_n_common_capsfeatures (GstElementFactory * fact1,
+    GstElementFactory * fact2, GstPlayFlags flags, gboolean isaudioelement)
+{
+  GstCaps *fact1_tmpl_caps, *fact2_tmpl_caps;
+  GstCapsFeatures *fact1_features, *fact2_features;
+  GstStructure *fact1_struct, *fact2_struct;
+  GList *cf_list = NULL;
+  guint fact1_caps_size, fact2_caps_size;
+  guint i, j, n_common_cf = 0;
+  GstCaps *raw_caps =
+      (isaudioelement) ? gst_static_caps_get (&raw_audio_caps) :
+      gst_static_caps_get (&raw_video_caps);
+  GstStructure *raw_struct = gst_caps_get_structure (raw_caps, 0);
+  gboolean native_raw =
+      (isaudioelement ? ! !(flags & GST_PLAY_FLAG_NATIVE_AUDIO) : ! !(flags &
+          GST_PLAY_FLAG_NATIVE_VIDEO));
+
+  fact1_tmpl_caps = get_template_caps (fact1, GST_PAD_SRC);
+  fact2_tmpl_caps = get_template_caps (fact2, GST_PAD_SINK);
+  if (!fact1_tmpl_caps || !fact2_tmpl_caps) {
+    GST_ERROR ("Failed to get template caps from decoder or sink");
+    return 0;
+  }
+
+  fact1_caps_size = gst_caps_get_size (fact1_tmpl_caps);
+  fact2_caps_size = gst_caps_get_size (fact2_tmpl_caps);
+
+  for (i = 0; i < fact1_caps_size; i++) {
+    fact1_features =
+        gst_caps_get_features ((const GstCaps *) fact1_tmpl_caps, i);
+    fact1_struct =
+        gst_caps_get_structure ((const GstCaps *) fact1_tmpl_caps, i);
+    for (j = 0; j < fact2_caps_size; j++) {
+
+      fact2_features =
+          gst_caps_get_features ((const GstCaps *) fact2_tmpl_caps, j);
+      fact2_struct =
+          gst_caps_get_structure ((const GstCaps *) fact2_tmpl_caps, j);
+
+      /* A common caps feature is given if the caps features are equal
+       * and the structures can intersect. If the NATIVE_AUDIO/NATIVE_VIDEO
+       * flags are not set we also allow if both structures are raw caps with
+       * system memory caps features, because in that case we have converters in
+       * place.
+       */
+      if (gst_caps_features_is_equal (fact1_features, fact2_features) &&
+          (gst_structure_can_intersect (fact1_struct, fact2_struct) ||
+              (!native_raw
+                  && gst_caps_features_is_equal (fact1_features,
+                      GST_CAPS_FEATURES_MEMORY_SYSTEM_MEMORY)
+                  && gst_structure_can_intersect (raw_struct, fact1_struct)
+                  && gst_structure_can_intersect (raw_struct, fact2_struct)))
+          && !is_included (cf_list, fact2_features)) {
+        cf_list = g_list_prepend (cf_list, fact2_features);
+        n_common_cf++;
+      }
+    }
+  }
+  if (cf_list)
+    g_list_free (cf_list);
+
+  gst_caps_unref (fact1_tmpl_caps);
+  gst_caps_unref (fact2_tmpl_caps);
+
+  return n_common_cf;
+}
diff --git a/gst/playback/gstplaybackutils.h b/gst/playback/gstplaybackutils.h
new file mode 100644
index 000000000..c9f895eb6
--- /dev/null
+++ b/gst/playback/gstplaybackutils.h
@@ -0,0 +1,37 @@
+/* Copyright (C) <2014> Intel Corporation
+ * Copyright (C) <2014> Sreerenj Balachandran <sreerenj.balachandran@intel.com>
+ *
+ * Author: Sreerenj Balachandran <sreerenj.balachandran@intel.com>
+ *
+ * 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., 51 Franklin St, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef __GST_PLAYBACK_UTILS_H__
+#define __GST_PLAYBACK_UTILS_H__
+
+G_BEGIN_DECLS
+
+#include <gst/gst.h>
+#include "gstplay-enum.h"
+
+guint
+gst_playback_utils_get_n_common_capsfeatures (GstElementFactory * fact1,
+                                        GstElementFactory * fact2,
+                                        GstPlayFlags flags,
+                                        gboolean isaudioelement);
+G_END_DECLS
+
+#endif /* __GST_PLAYBACK_UTILS_H__ */
diff --git a/gst/playback/gstplaybin2.c b/gst/playback/gstplaybin2.c
index 3c19754f5..0929026e9 100644
--- a/gst/playback/gstplaybin2.c
+++ b/gst/playback/gstplaybin2.c
@@ -237,6 +237,7 @@
 #include "gstplayback.h"
 #include "gstplaysink.h"
 #include "gstsubtitleoverlay.h"
+#include "gstplaybackutils.h"
 
 GST_DEBUG_CATEGORY_STATIC (gst_play_bin_debug);
 #define GST_CAT_DEFAULT gst_play_bin_debug
@@ -3811,103 +3812,6 @@ avelement_compare (gconstpointer p1, gconstpointer p2)
   return strcmp (GST_OBJECT_NAME (fd1), GST_OBJECT_NAME (fd2));
 }
 
-/* unref the caps after usage */
-static GstCaps *
-get_template_caps (GstElementFactory * factory, GstPadDirection direction)
-{
-  const GList *templates;
-  GstStaticPadTemplate *templ = NULL;
-  GList *walk;
-
-  templates = gst_element_factory_get_static_pad_templates (factory);
-  for (walk = (GList *) templates; walk; walk = g_list_next (walk)) {
-    templ = walk->data;
-    if (templ->direction == direction)
-      break;
-  }
-  if (templ)
-    return gst_static_caps_get (&templ->static_caps);
-  else
-    return NULL;
-}
-
-static gboolean
-is_included (GList * list, GstCapsFeatures * cf)
-{
-  for (; list; list = list->next) {
-    if (gst_caps_features_is_equal ((GstCapsFeatures *) list->data, cf))
-      return TRUE;
-  }
-  return FALSE;
-}
-
-/* compute the number of common caps features */
-static guint
-get_n_common_capsfeatures (GstPlayBin * playbin, GstElementFactory * dec,
-    GstElementFactory * sink, gboolean isaudioelement)
-{
-  GstCaps *d_tmpl_caps, *s_tmpl_caps;
-  GstCapsFeatures *d_features, *s_features;
-  GstStructure *d_struct, *s_struct;
-  GList *cf_list = NULL;
-  guint d_caps_size, s_caps_size;
-  guint i, j, n_common_cf = 0;
-  GstCaps *raw_caps =
-      (isaudioelement) ? gst_static_caps_get (&raw_audio_caps) :
-      gst_static_caps_get (&raw_video_caps);
-  GstStructure *raw_struct = gst_caps_get_structure (raw_caps, 0);
-  GstPlayFlags flags = gst_play_bin_get_flags (playbin);
-  gboolean native_raw =
-      (isaudioelement ? ! !(flags & GST_PLAY_FLAG_NATIVE_AUDIO) : ! !(flags &
-          GST_PLAY_FLAG_NATIVE_VIDEO));
-
-  d_tmpl_caps = get_template_caps (dec, GST_PAD_SRC);
-  s_tmpl_caps = get_template_caps (sink, GST_PAD_SINK);
-
-  if (!d_tmpl_caps || !s_tmpl_caps) {
-    GST_ERROR ("Failed to get template caps from decoder or sink");
-    return 0;
-  }
-
-  d_caps_size = gst_caps_get_size (d_tmpl_caps);
-  s_caps_size = gst_caps_get_size (s_tmpl_caps);
-
-  for (i = 0; i < d_caps_size; i++) {
-    d_features = gst_caps_get_features ((const GstCaps *) d_tmpl_caps, i);
-    d_struct = gst_caps_get_structure ((const GstCaps *) d_tmpl_caps, i);
-    for (j = 0; j < s_caps_size; j++) {
-
-      s_features = gst_caps_get_features ((const GstCaps *) s_tmpl_caps, j);
-      s_struct = gst_caps_get_structure ((const GstCaps *) s_tmpl_caps, j);
-
-      /* A common caps feature is given if the caps features are equal
-       * and the structures can intersect. If the NATIVE_AUDIO/NATIVE_VIDEO
-       * flags are not set we also allow if both structures are raw caps with
-       * system memory caps features, because in that case we have converters in
-       * place.
-       */
-      if (gst_caps_features_is_equal (d_features, s_features) &&
-          (gst_structure_can_intersect (d_struct, s_struct) ||
-              (!native_raw
-                  && gst_caps_features_is_equal (d_features,
-                      GST_CAPS_FEATURES_MEMORY_SYSTEM_MEMORY)
-                  && gst_structure_can_intersect (raw_struct, d_struct)
-                  && gst_structure_can_intersect (raw_struct, s_struct)))
-          && !is_included (cf_list, s_features)) {
-        cf_list = g_list_prepend (cf_list, s_features);
-        n_common_cf++;
-      }
-    }
-  }
-  if (cf_list)
-    g_list_free (cf_list);
-
-  gst_caps_unref (d_tmpl_caps);
-  gst_caps_unref (s_tmpl_caps);
-
-  return n_common_cf;
-}
-
 static GSequence *
 avelements_create (GstPlayBin * playbin, gboolean isaudioelement)
 {
@@ -3951,8 +3855,8 @@ avelements_create (GstPlayBin * playbin, gboolean isaudioelement)
       s_factory = (GstElementFactory *) sl->data;
 
       n_common_cf =
-          get_n_common_capsfeatures (playbin, d_factory, s_factory,
-          isaudioelement);
+          gst_playback_utils_get_n_common_capsfeatures (d_factory, s_factory,
+          gst_play_bin_get_flags (playbin), isaudioelement);
       if (n_common_cf < 1)
         continue;