slackbuilds/multimedia/gst0-plugins-base/patches/03-videoscale-fix-negotiation.patch

From 63d1316c0fd4ce22cf4a53f4aa7cb1ca16a07aa8 Mon Sep 17 00:00:00 2001
From: Tim-Philipp Müller <tim.muller@collabora.co.uk>
Date: Sun, 26 Feb 2012 18:19:57 +0000
Subject: videoscale: fix negotiation after addition of new formats and methods

Now that we no longer support all methods for all formats, we
need to cater for that in the transform function: we can't
transform formats not supported by the currently-selected
mehod.

make check, folks. It's da bomb.
---
diff --git a/gst/videoscale/gstvideoscale.c b/gst/videoscale/gstvideoscale.c
index 9f072a3..60dd5ff 100644
--- a/gst/videoscale/gstvideoscale.c
+++ b/gst/videoscale/gstvideoscale.c
@@ -424,10 +424,118 @@ gst_video_scale_get_property (GObject * object, guint prop_id, GValue * value,
   }
 }
 
+#define NEAREST  (1 << GST_VIDEO_SCALE_NEAREST)
+#define BILINEAR (1 << GST_VIDEO_SCALE_BILINEAR)
+#define FOURTAP  (1 << GST_VIDEO_SCALE_4TAP)
+#define LANCZOS  (1 << GST_VIDEO_SCALE_LANCZOS)
+
+/* or we could just do lookups via table[format] if we could be bothered..  */
+static const struct
+{
+  GstVideoFormat format;
+  guint8 methods;
+} formats_methods_table[] = {
+  {
+  GST_VIDEO_FORMAT_RGBx, NEAREST | BILINEAR | FOURTAP | LANCZOS}, {
+  GST_VIDEO_FORMAT_xRGB, NEAREST | BILINEAR | FOURTAP | LANCZOS}, {
+  GST_VIDEO_FORMAT_BGRx, NEAREST | BILINEAR | FOURTAP | LANCZOS}, {
+  GST_VIDEO_FORMAT_xBGR, NEAREST | BILINEAR | FOURTAP | LANCZOS}, {
+  GST_VIDEO_FORMAT_RGBA, NEAREST | BILINEAR | FOURTAP | LANCZOS}, {
+  GST_VIDEO_FORMAT_ARGB, NEAREST | BILINEAR | FOURTAP | LANCZOS}, {
+  GST_VIDEO_FORMAT_BGRA, NEAREST | BILINEAR | FOURTAP | LANCZOS}, {
+  GST_VIDEO_FORMAT_ABGR, NEAREST | BILINEAR | FOURTAP | LANCZOS}, {
+  GST_VIDEO_FORMAT_AYUV, NEAREST | BILINEAR | FOURTAP | LANCZOS}, {
+  GST_VIDEO_FORMAT_ARGB64, NEAREST | BILINEAR | FOURTAP | LANCZOS}, {
+  GST_VIDEO_FORMAT_AYUV64, NEAREST | BILINEAR | FOURTAP | LANCZOS}, {
+  GST_VIDEO_FORMAT_RGB, NEAREST | BILINEAR | FOURTAP}, {
+  GST_VIDEO_FORMAT_BGR, NEAREST | BILINEAR | FOURTAP}, {
+  GST_VIDEO_FORMAT_v308, NEAREST | BILINEAR | FOURTAP}, {
+  GST_VIDEO_FORMAT_YUY2, NEAREST | BILINEAR | FOURTAP}, {
+  GST_VIDEO_FORMAT_YVYU, NEAREST | BILINEAR | FOURTAP}, {
+  GST_VIDEO_FORMAT_UYVY, NEAREST | BILINEAR | FOURTAP}, {
+  GST_VIDEO_FORMAT_Y800, NEAREST | BILINEAR | FOURTAP}, {
+  GST_VIDEO_FORMAT_GRAY8, NEAREST | BILINEAR | FOURTAP}, {
+  GST_VIDEO_FORMAT_GRAY16_LE, NEAREST | BILINEAR | FOURTAP}, {
+  GST_VIDEO_FORMAT_GRAY16_BE, NEAREST | BILINEAR | FOURTAP}, {
+  GST_VIDEO_FORMAT_Y16, NEAREST | BILINEAR | FOURTAP}, {
+  GST_VIDEO_FORMAT_I420, NEAREST | BILINEAR | FOURTAP | LANCZOS}, {
+  GST_VIDEO_FORMAT_YV12, NEAREST | BILINEAR | FOURTAP | LANCZOS}, {
+  GST_VIDEO_FORMAT_Y444, NEAREST | BILINEAR | FOURTAP | LANCZOS}, {
+  GST_VIDEO_FORMAT_Y42B, NEAREST | BILINEAR | FOURTAP | LANCZOS}, {
+  GST_VIDEO_FORMAT_Y41B, NEAREST | BILINEAR | FOURTAP | LANCZOS}, {
+  GST_VIDEO_FORMAT_NV12, NEAREST | BILINEAR}, {
+  GST_VIDEO_FORMAT_RGB16, NEAREST | BILINEAR | FOURTAP}, {
+  GST_VIDEO_FORMAT_RGB15, NEAREST | BILINEAR | FOURTAP}
+};
+
+static gboolean
+gst_video_scale_format_supported_for_method (GstVideoFormat format,
+    GstVideoScaleMethod method)
+{
+  int i;
+
+  for (i = 0; i < G_N_ELEMENTS (formats_methods_table); ++i) {
+    if (formats_methods_table[i].format == format)
+      return ((formats_methods_table[i].methods & (1 << method)) != 0);
+  }
+  return FALSE;
+}
+
+static gboolean
+gst_video_scale_transform_supported (GstVideoScale * videoscale,
+    GstVideoScaleMethod method, GstStructure * structure)
+{
+  const GValue *val;
+  GstVideoFormat fmt;
+  gboolean supported = TRUE;
+  GstStructure *s;
+  GstCaps *c;
+
+  /* we support these methods for all formats */
+  if (method == GST_VIDEO_SCALE_NEAREST || method == GST_VIDEO_SCALE_BILINEAR)
+    return TRUE;
+
+  /* we need fixed caps if we want to use gst_video_parse_caps() */
+  s = gst_structure_new (gst_structure_get_name (structure),
+      "width", G_TYPE_INT, 1, "height", G_TYPE_INT, 1, NULL);
+
+  if ((val = gst_structure_get_value (structure, "format"))) {
+    gst_structure_set_value (s, "format", val);
+  } else {
+    if ((val = gst_structure_get_value (structure, "endianness")))
+      gst_structure_set_value (s, "endianness", val);
+    if ((val = gst_structure_get_value (structure, "red_mask")))
+      gst_structure_set_value (s, "red_mask", val);
+    if ((val = gst_structure_get_value (structure, "blue_mask")))
+      gst_structure_set_value (s, "blue_mask", val);
+    if ((val = gst_structure_get_value (structure, "green_mask")))
+      gst_structure_set_value (s, "green_mask", val);
+    if ((val = gst_structure_get_value (structure, "alpha_mask")))
+      gst_structure_set_value (s, "alpha_mask", val);
+    if ((val = gst_structure_get_value (structure, "depth")))
+      gst_structure_set_value (s, "depth", val);
+    if ((val = gst_structure_get_value (structure, "bpp")))
+      gst_structure_set_value (s, "bpp", val);
+  }
+  c = gst_caps_new_full (s, NULL);
+  if (!gst_video_format_parse_caps (c, &fmt, NULL, NULL)) {
+    GST_ERROR_OBJECT (videoscale, "couldn't parse %" GST_PTR_FORMAT, c);
+  } else if (!gst_video_scale_format_supported_for_method (fmt, method)) {
+    supported = FALSE;
+  }
+  GST_LOG_OBJECT (videoscale, "method %d %ssupported for format %d",
+      method, (supported) ? "" : "not ", fmt);
+  gst_caps_unref (c);
+
+  return supported;
+}
+
 static GstCaps *
 gst_video_scale_transform_caps (GstBaseTransform * trans,
     GstPadDirection direction, GstCaps * caps)
 {
+  GstVideoScale *videoscale = GST_VIDEO_SCALE (trans);
+  GstVideoScaleMethod method;
   GstCaps *ret;
   GstStructure *structure;
 
@@ -441,6 +549,13 @@ gst_video_scale_transform_caps (GstBaseTransform * trans,
   ret = gst_caps_copy (caps);
   structure = gst_structure_copy (gst_caps_get_structure (ret, 0));
 
+  GST_OBJECT_LOCK (videoscale);
+  method = videoscale->method;
+  GST_OBJECT_UNLOCK (videoscale);
+
+  if (!gst_video_scale_transform_supported (videoscale, method, structure))
+    goto format_not_supported;
+
   gst_structure_set (structure,
       "width", GST_TYPE_INT_RANGE, 1, G_MAXINT,
       "height", GST_TYPE_INT_RANGE, 1, G_MAXINT, NULL);
@@ -452,9 +567,19 @@ gst_video_scale_transform_caps (GstBaseTransform * trans,
   }
   gst_caps_append_structure (ret, structure);
 
+done:
+
   GST_DEBUG_OBJECT (trans, "returning caps: %" GST_PTR_FORMAT, ret);
 
   return ret;
+
+format_not_supported:
+  {
+    gst_structure_free (structure);
+    gst_caps_unref (ret);
+    ret = gst_caps_new_empty ();
+    goto done;
+  }
 }
 
 static gboolean
--
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