Adding gstopencvutils

Adds a file to keep utilitary functions together

ext/opencv/Makefile.am

@@ -5,7 +5,7 @@ SUBDIRS = basicfilters edgedetect faceblur facedetect pyramidsegment templatemat
 plugin_LTLIBRARIES = libgstopencv.la
 
 # sources used to compile this plug-in
-libgstopencv_la_SOURCES = gstopencv.c gstopencvbasetrans.c
+libgstopencv_la_SOURCES = gstopencv.c gstopencvbasetrans.c gstopencvutils.c
 
 # flags used to compile this facedetect
 # add other _CFLAGS and _LIBS as needed
@@ -40,4 +40,4 @@ libgstopencv_la_DEPENDENCIES = \
 								 $(top_builddir)/ext/opencv/textwrite/libgsttextwrite.la
 
 # headers we need but don't want installed
-noinst_HEADERS = gstopencvbasetrans.h
+noinst_HEADERS = gstopencvbasetrans.h gstopencvutils.h

ext/opencv/gstopencvbasetrans.c

@@ -50,6 +50,7 @@
 #include <gst/gst.h>
 
 #include "gstopencvbasetrans.h"
+#include "gstopencvutils.h"
 
 GST_DEBUG_CATEGORY_STATIC (gst_opencv_base_transform_debug);
 #define GST_CAT_DEFAULT gst_opencv_base_transform_debug
@@ -210,13 +211,26 @@ gst_opencv_base_transform_set_caps (GstBaseTransform * trans, GstCaps * incaps,
     GstCaps * outcaps)
 {
   GstOpencvBaseTransform *transform = GST_OPENCV_BASE_TRANSFORM (trans);
-  GstStructure *structure;
-  gint width, height;
+  gint in_width, in_height;
+  gint in_depth, in_type, in_channels;
+  gint out_width, out_height;
+  gint out_depth, out_type, out_channels;
+  GError *in_err = NULL;
+  GError *out_err = NULL;
 
-  structure = gst_caps_get_structure (incaps, 0);
-  if (!gst_structure_get_int (structure, "width", &width) ||
-      !gst_structure_get_int (structure, "height", &height)) {
-    GST_WARNING_OBJECT (transform, "No width/height on caps");
+  if (!gst_opencv_parse_iplimage_params_from_caps (incaps, &in_width,
+      &in_height, &in_depth, &in_type, &in_channels, &in_err)) {
+    GST_WARNING_OBJECT (transform, "Failed to parse input caps: %s",
+        in_err->message);
+    g_error_free (in_err);
+    return FALSE;
+  }
+
+  if (!gst_opencv_parse_iplimage_params_from_caps (outcaps, &out_width,
+      &out_height, &out_depth, &out_type, &out_channels, &out_err)) {
+    GST_WARNING_OBJECT (transform, "Failed to parse output caps: %s",
+        out_err->message);
+    g_error_free (out_err);
     return FALSE;
   }
 
@@ -227,11 +241,11 @@ gst_opencv_base_transform_set_caps (GstBaseTransform * trans, GstCaps * incaps,
     cvReleaseImage (&transform->out_cvImage);
   }
 
-  /* FIXME - how do we know it is IPL_DEPTH_8U? */
   transform->cvImage =
-      cvCreateImageHeader (cvSize (width, height), IPL_DEPTH_8U, 3);
+      cvCreateImageHeader (cvSize (in_width, in_height), in_depth, in_channels);
   transform->out_cvImage =
-      cvCreateImageHeader (cvSize (width, height), IPL_DEPTH_8U, 3);
+      cvCreateImageHeader (cvSize (out_width, out_height), out_depth,
+          out_channels);
 
   gst_base_transform_set_in_place (GST_BASE_TRANSFORM (transform),
       transform->in_place);

ext/opencv/gstopencvutils.c

@@ -0,0 +1,82 @@
+/* GStreamer
+ * Copyright (C) <2010> Thiago Santos <thiago.sousa.santos@collabora.co.uk>
+ *
+ * gstopencvutils.c: miscellaneous utility functions
+ *
+ * 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.
+ */
+
+#include "gstopencvutils.h"
+
+gboolean
+gst_opencv_get_ipl_depth_and_channels (GstStructure * structure,
+    gint * ipldepth, gint * channels, GError ** err)
+{
+  gint depth, bpp;
+
+  if (gst_structure_has_name (structure, "video/x-raw-rgb")) {
+    *channels = 3;
+
+    if (!gst_structure_get_int (structure, "depth", &depth) ||
+        !gst_structure_get_int (structure, "bpp", &bpp)) {
+      g_set_error (err, GST_CORE_ERROR, GST_CORE_ERROR_NEGOTIATION,
+          "No depth/bpp in caps");
+      return FALSE;
+    }
+
+    if (depth != bpp) {
+      g_set_error (err, GST_CORE_ERROR, GST_CORE_ERROR_NEGOTIATION,
+          "Depth and bpp should be equal");
+      return FALSE;
+    }
+
+    if (depth == 24) {
+      /* TODO signdness? */
+      *ipldepth = IPL_DEPTH_8U;
+    } else {
+      g_set_error (err, GST_CORE_ERROR, GST_CORE_ERROR_NEGOTIATION,
+          "Unsupported depth: %d", depth);
+      return FALSE;
+    }
+
+    return TRUE;
+  } else {
+    g_set_error (err, GST_CORE_ERROR, GST_CORE_ERROR_NEGOTIATION,
+        "Unsupported caps %s", gst_structure_get_name (structure));
+    return FALSE;
+  }
+}
+
+gboolean
+gst_opencv_parse_iplimage_params_from_caps (GstCaps * caps, gint * width,
+    gint * height, gint * ipldepth, gint * type, gint * channels, GError ** err)
+{
+  GstStructure *structure = gst_caps_get_structure (caps, 0);
+
+  if (!gst_opencv_get_ipl_depth_and_channels (structure, ipldepth, channels,
+          err)) {
+    return FALSE;
+  }
+
+  if (!gst_structure_get_int (structure, "width", width) ||
+      !gst_structure_get_int (structure, "height", height)) {
+    g_set_error (err, GST_CORE_ERROR, GST_CORE_ERROR_NEGOTIATION,
+        "No width/height in caps");
+    return FALSE;
+  }
+
+  return TRUE;
+}

ext/opencv/gstopencvutils.h

@@ -0,0 +1,39 @@
+/* GStreamer
+ * Copyright (C) <2010> Thiago Santos <thiago.sousa.santos@collabora.co.uk>
+ *
+ * gstopencvutils.h: miscellaneous utility functions
+ *
+ * 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.
+ */
+
+#ifndef __GST_OPENCV_UTILS__
+#define __GST_OPENCV_UTILS__
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <gst/gst.h>
+#include <cv.h>
+
+gboolean
+gst_opencv_get_ipldepth (gint depth, gint bpp, gint * ipldepth);
+
+gboolean gst_opencv_parse_iplimage_params_from_caps
+    (GstCaps * caps, gint * width, gint * height, gint * depth, gint * type,
+    gint * channels, GError ** err);
+
+#endif /* __GST_OPENCV_UTILS__ */