video-format: add method to get palette

Make a new method to get the default palette for paletted formats.

gst-libs/gst/video/video-format.c

@@ -1008,6 +1008,52 @@ unpack_RGB8P (const GstVideoFormatInfo * info, GstVideoPackFlags flags,
   }
 }
 
+static guint32 std_palette_RGB8P[] = {
+  0xff000000, 0xff000033, 0xff000066, 0xff000099, 0xff0000cc, 0xff0000ff,
+  0xff003300, 0xff003333, 0xff003366, 0xff003399, 0xff0033cc, 0xff0033ff,
+  0xff006600, 0xff006633, 0xff006666, 0xff006699, 0xff0066cc, 0xff0066ff,
+  0xff009900, 0xff009933, 0xff009966, 0xff009999, 0xff0099cc, 0xff0099ff,
+  0xff00cc00, 0xff00cc33, 0xff00cc66, 0xff00cc99, 0xff00cccc, 0xff00ccff,
+  0xff00ff00, 0xff00ff33, 0xff00ff66, 0xff00ff99, 0xff00ffcc, 0xff00ffff,
+  0xff330000, 0xff330033, 0xff330066, 0xff330099, 0xff3300cc, 0xff3300ff,
+  0xff333300, 0xff333333, 0xff333366, 0xff333399, 0xff3333cc, 0xff3333ff,
+  0xff336600, 0xff336633, 0xff336666, 0xff336699, 0xff3366cc, 0xff3366ff,
+  0xff339900, 0xff339933, 0xff339966, 0xff339999, 0xff3399cc, 0xff3399ff,
+  0xff33cc00, 0xff33cc33, 0xff33cc66, 0xff33cc99, 0xff33cccc, 0xff33ccff,
+  0xff33ff00, 0xff33ff33, 0xff33ff66, 0xff33ff99, 0xff33ffcc, 0xff33ffff,
+  0xff660000, 0xff660033, 0xff660066, 0xff660099, 0xff6600cc, 0xff6600ff,
+  0xff663300, 0xff663333, 0xff663366, 0xff663399, 0xff6633cc, 0xff6633ff,
+  0xff666600, 0xff666633, 0xff666666, 0xff666699, 0xff6666cc, 0xff6666ff,
+  0xff669900, 0xff669933, 0xff669966, 0xff669999, 0xff6699cc, 0xff6699ff,
+  0xff66cc00, 0xff66cc33, 0xff66cc66, 0xff66cc99, 0xff66cccc, 0xff66ccff,
+  0xff66ff00, 0xff66ff33, 0xff66ff66, 0xff66ff99, 0xff66ffcc, 0xff66ffff,
+  0xff990000, 0xff990033, 0xff990066, 0xff990099, 0xff9900cc, 0xff9900ff,
+  0xff993300, 0xff993333, 0xff993366, 0xff993399, 0xff9933cc, 0xff9933ff,
+  0xff996600, 0xff996633, 0xff996666, 0xff996699, 0xff9966cc, 0xff9966ff,
+  0xff999900, 0xff999933, 0xff999966, 0xff999999, 0xff9999cc, 0xff9999ff,
+  0xff99cc00, 0xff99cc33, 0xff99cc66, 0xff99cc99, 0xff99cccc, 0xff99ccff,
+  0xff99ff00, 0xff99ff33, 0xff99ff66, 0xff99ff99, 0xff99ffcc, 0xff99ffff,
+  0xffcc0000, 0xffcc0033, 0xffcc0066, 0xffcc0099, 0xffcc00cc, 0xffcc00ff,
+  0xffcc3300, 0xffcc3333, 0xffcc3366, 0xffcc3399, 0xffcc33cc, 0xffcc33ff,
+  0xffcc6600, 0xffcc6633, 0xffcc6666, 0xffcc6699, 0xffcc66cc, 0xffcc66ff,
+  0xffcc9900, 0xffcc9933, 0xffcc9966, 0xffcc9999, 0xffcc99cc, 0xffcc99ff,
+  0xffcccc00, 0xffcccc33, 0xffcccc66, 0xffcccc99, 0xffcccccc, 0xffccccff,
+  0xffccff00, 0xffccff33, 0xffccff66, 0xffccff99, 0xffccffcc, 0xffccffff,
+  0xffff0000, 0xffff0033, 0xffff0066, 0xffff0099, 0xffff00cc, 0xffff00ff,
+  0xffff3300, 0xffff3333, 0xffff3366, 0xffff3399, 0xffff33cc, 0xffff33ff,
+  0xffff6600, 0xffff6633, 0xffff6666, 0xffff6699, 0xffff66cc, 0xffff66ff,
+  0xffff9900, 0xffff9933, 0xffff9966, 0xffff9999, 0xffff99cc, 0xffff99ff,
+  0xffffcc00, 0xffffcc33, 0xffffcc66, 0xffffcc99, 0xffffcccc, 0xffffccff,
+  0xffffff00, 0xffffff33, 0xffffff66, 0xffffff99, 0xffffffcc, 0xffffffff,
+  0x00000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000,
+  0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000,
+  0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000,
+  0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000,
+  0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000,
+  0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000, 0xff000000,
+  0xff000000, 0xff000000, 0xff000000, 0xff000000
+};
+
 static void
 pack_RGB8P (const GstVideoFormatInfo * info, GstVideoPackFlags flags,
     const gpointer src, gint sstride, gpointer data[GST_VIDEO_MAX_PLANES],
@@ -2241,6 +2287,32 @@ gst_video_format_get_info (GstVideoFormat format)
   return &formats[format].info;
 }
 
+/**
+ * gst_video_format_get_palette:
+ * @format: a #GstVideoFormat
+ * @size: (out): size of the palette in bytes
+ *
+ * Get the default palette of @format. This the palette used in the pack
+ * function for paletted formats.
+ *
+ * Returns: the default palette of @format or %NULL when @format does not have a
+ * palette.
+ */
+const gpointer
+gst_video_format_get_palette (GstVideoFormat format, gsize * size)
+{
+  g_return_val_if_fail (format < G_N_ELEMENTS (formats), NULL);
+  g_return_val_if_fail (size != NULL, NULL);
+
+  switch (format) {
+    case GST_VIDEO_FORMAT_RGB8P:
+      *size = sizeof (std_palette_RGB8P);
+      return std_palette_RGB8P;
+    default:
+      return NULL;
+  }
+}
+
 typedef struct
 {
   const gchar *name;

gst-libs/gst/video/video-format.h

@@ -436,6 +436,8 @@ const gchar *  gst_video_format_to_string            (GstVideoFormat format) G_G
 const GstVideoFormatInfo *
                gst_video_format_get_info             (GstVideoFormat format) G_GNUC_CONST;
 
+const gpointer gst_video_format_get_palette          (GstVideoFormat format, gsize *size);
+
 #define GST_VIDEO_SIZE_RANGE "(int) [ 1, max ]"
 #define GST_VIDEO_FPS_RANGE "(fraction) [ 0, max ]"
 

win32/common/libgstvideo.def

@@ -128,6 +128,7 @@ EXPORTS
 	gst_video_format_from_masks
 	gst_video_format_from_string
 	gst_video_format_get_info
+	gst_video_format_get_palette
 	gst_video_format_get_type
 	gst_video_format_to_fourcc
 	gst_video_format_to_string