[aravis] gst: add arv_pixel_format_from_gst_caps.

[Emmanuel Pacaud <emmanuel src gnome org>]

commit df7a7e6f6d3e1b851d16ba4f16c5cdbae67659e4
Author: Emmanuel Pacaud <emmanuel gnome org>
Date:   Wed Feb 16 15:54:48 2011 +0100

    gst: add arv_pixel_format_from_gst_caps.

 src/arvtools.c |   96 +++++++++++++++++++++++++++++++++++++++++++++++++-------
 src/arvtools.h |    1 +
 2 files changed, 85 insertions(+), 12 deletions(-)
---
diff --git a/src/arvtools.c b/src/arvtools.c
index 7d6b5fa..747990c 100644
--- a/src/arvtools.c
+++ b/src/arvtools.c
@@ -694,24 +694,73 @@ CLEANUP:
  * @short_description: Gstreamer utilities
  */
 
+#define ARV_MAKE_FOURCC(a,b,c,d)        ((guint32)((a)|(b)<<8|(c)<<16|(d)<<24))
+
 typedef struct {
 	ArvPixelFormat pixel_format;
 	const char *gst_caps_string;
+	const char *name;
+	int bpp;
+	int depth;
+	guint32 fourcc;
 } ArvGstCapsInfos;
 
 ArvGstCapsInfos arv_gst_caps_infos[] = {
-	{ ARV_PIXEL_FORMAT_MONO_8,			"video/x-raw-gray, bpp=(int)8, depth=(int)8"},
-	{ ARV_PIXEL_FORMAT_MONO_10,			"video/x-raw-gray, bpp=(int)16, depth=(int)10"},
-	{ ARV_PIXEL_FORMAT_MONO_12,			"video/x-raw-gray, bpp=(int)16, depth=(int)12"},
-	{ ARV_PIXEL_FORMAT_MONO_12_PACKED,		"video/x-raw-gray, bpp=(int)12, depth=(int)12"},
-	{ ARV_PIXEL_FORMAT_MONO_16,			"video/x-raw-gray, bpp=(int)16, depth=(int)16"},
-	{ ARV_PIXEL_FORMAT_BAYER_BG_8,			"video/x-raw-bayer, bpp=(int)8, depth=(int)8"},
-	{ ARV_PIXEL_FORMAT_YUV_422_PACKED,		"video/x-raw-yuv, format=(fourcc)UYVY"},
-	{ ARV_PIXEL_FORMAT_YUV_422_YUYV_PACKED,		"video/x-raw-yuv, format=(fourcc)YUY2"},
-	{ ARV_PIXEL_FORMAT_RGB_8_PACKED,		"video/x-raw-rgb, bpp=(int)24, depth=(int)24"},
-
-	{ ARV_PIXEL_FORMAT_CUSTOM_YUV_422_YUYV_PACKED,	"video/x-raw-yuv, format=(fourcc)YUY2"},
-	{ ARV_PIXEL_FORMAT_CUSTOM_BAYER_BG_16,		"video/x-raw-bayer, bpp=(int)16, depth=(int)16"}
+	{
+		ARV_PIXEL_FORMAT_MONO_8,
+		"video/x-raw-gray, bpp=(int)8, depth=(int)8",
+		"video/x-raw-gray", 	8,	8,	0
+	},
+	{
+		ARV_PIXEL_FORMAT_MONO_10,
+		"video/x-raw-gray, bpp=(int)16, depth=(int)10",
+		"video/x-raw-gray", 	16,	10,	0,
+	},
+	{
+	       ARV_PIXEL_FORMAT_MONO_12,
+	       "video/x-raw-gray, bpp=(int)16, depth=(int)12",
+	       "video/x-raw-gray",	16,	12,	0,
+	},
+	{
+		ARV_PIXEL_FORMAT_MONO_12_PACKED,
+		"video/x-raw-gray, bpp=(int)12, depth=(int)12",
+		"video/x-raw-gray",	12,	12,	0,
+	},
+	{
+		ARV_PIXEL_FORMAT_MONO_16,
+		"video/x-raw-gray, bpp=(int)16, depth=(int)16",
+		"video/x-raw-gray",	16,	16,	0
+	},
+	{
+	       ARV_PIXEL_FORMAT_BAYER_BG_8,
+	       "video/x-raw-bayer, bpp=(int)8, depth=(int)8",
+	       "video/x-raw-bayer",	8,	8,	0
+	},
+	{
+		ARV_PIXEL_FORMAT_YUV_422_PACKED,
+		"video/x-raw-yuv, format=(fourcc)UYVY",
+		"video/x-raw-yuv",	0,	0,	ARV_MAKE_FOURCC ('U','Y','V','Y')
+	},
+	{
+	       ARV_PIXEL_FORMAT_YUV_422_YUYV_PACKED,
+	       "video/x-raw-yuv, format=(fourcc)YUY2",
+	       "video/x-raw-yuv",	0,	0,	ARV_MAKE_FOURCC ('Y','U','Y','2')
+	},
+	{
+		ARV_PIXEL_FORMAT_RGB_8_PACKED,
+		"video/x-raw-rgb, bpp=(int)24, depth=(int)24",
+		"video/x-raw-rgb",	24,	24,	0
+	},
+	{
+		ARV_PIXEL_FORMAT_CUSTOM_YUV_422_YUYV_PACKED,
+		"video/x-raw-yuv, format=(fourcc)YUY2",
+		"video/x-raw-yuv",	0,	0,	ARV_MAKE_FOURCC ('Y','U','Y','2')
+	},
+	{
+		ARV_PIXEL_FORMAT_CUSTOM_BAYER_BG_16,
+		"video/x-raw-bayer, bpp=(int)16, depth=(int)16",
+		"video/x-raw-bayer",	16,	16,	0
+	}
 };
 
 /**
@@ -739,3 +788,26 @@ arv_pixel_format_to_gst_caps_string (ArvPixelFormat pixel_format)
 
 	return arv_gst_caps_infos[i].gst_caps_string;
 }
+
+ArvPixelFormat
+arv_pixel_format_from_gst_caps (const char *name, int bpp, int depth, guint32 fourcc)
+{
+	unsigned int i;
+
+	g_return_val_if_fail (name != NULL, 0);
+
+	for (i = 0; i < G_N_ELEMENTS (arv_gst_caps_infos); i++) {
+		if (strcmp (name, arv_gst_caps_infos[i].name) != 0)
+			continue;
+
+		if (strcmp (name, "video/x-raw-yuv") == 0 &&
+		    fourcc == arv_gst_caps_infos[i].fourcc)
+			return arv_gst_caps_infos[i].pixel_format;
+
+		if (depth == arv_gst_caps_infos[i].depth &&
+		    bpp == arv_gst_caps_infos[i].bpp)
+			return arv_gst_caps_infos[i].pixel_format;
+	}
+
+	return 0;
+}
diff --git a/src/arvtools.h b/src/arvtools.h
index 3e2408b..ec1b2d5 100644
--- a/src/arvtools.h
+++ b/src/arvtools.h
@@ -108,6 +108,7 @@ void 		arv_copy_memory_with_endianess 	(void *to, size_t to_size, guint to_endia
 void * 		arv_decompress 			(void *input_buffer, size_t input_size, size_t *output_size);
 
 const char * 	arv_pixel_format_to_gst_caps_string 	(ArvPixelFormat pixel_format);
+ArvPixelFormat 	arv_pixel_format_from_gst_caps 		(const char *name, int bpp, int depth, guint32 fourcc);
 
 /*
    Compatibility with glib < 2.23