From 8741707430337df39c52421687c743db7276fcbf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sebastian=20Dr=C3=B6ge?= <sebastian.droege@collabora.co.uk>
Date: Wed, 13 Oct 2010 20:45:28 +0200
Subject: [PATCH] video: API: Add A420 video format

This is planar 4:2:0 YUV plus non-subsampled alpha plane.
---
 gst-libs/gst/video/video.c | 47 ++++++++++++++++++++++++++++++++++++++
 gst-libs/gst/video/video.h |  4 +++-
 2 files changed, 50 insertions(+), 1 deletion(-)

diff --git a/gst-libs/gst/video/video.c b/gst-libs/gst/video/video.c
index ea782b91ff..8af88a71a4 100644
--- a/gst-libs/gst/video/video.c
+++ b/gst-libs/gst/video/video.c
@@ -774,6 +774,8 @@ gst_video_format_from_fourcc (guint32 fourcc)
       return GST_VIDEO_FORMAT_Y16;
     case GST_MAKE_FOURCC ('U', 'Y', 'V', 'P'):
       return GST_VIDEO_FORMAT_UYVP;
+    case GST_MAKE_FOURCC ('A', '4', '2', '0'):
+      return GST_VIDEO_FORMAT_A420;
     default:
       return GST_VIDEO_FORMAT_UNKNOWN;
   }
@@ -831,6 +833,8 @@ gst_video_format_to_fourcc (GstVideoFormat format)
       return GST_MAKE_FOURCC ('Y', '1', '6', ' ');
     case GST_VIDEO_FORMAT_UYVP:
       return GST_MAKE_FOURCC ('U', 'Y', 'V', 'P');
+    case GST_VIDEO_FORMAT_A420:
+      return GST_MAKE_FOURCC ('A', '4', '2', '0');
     default:
       return 0;
   }
@@ -965,6 +969,7 @@ gst_video_format_is_rgb (GstVideoFormat format)
     case GST_VIDEO_FORMAT_NV21:
     case GST_VIDEO_FORMAT_v308:
     case GST_VIDEO_FORMAT_UYVP:
+    case GST_VIDEO_FORMAT_A420:
       return FALSE;
     case GST_VIDEO_FORMAT_RGBx:
     case GST_VIDEO_FORMAT_BGRx:
@@ -1017,6 +1022,7 @@ gst_video_format_is_yuv (GstVideoFormat format)
     case GST_VIDEO_FORMAT_Y800:
     case GST_VIDEO_FORMAT_Y16:
     case GST_VIDEO_FORMAT_UYVP:
+    case GST_VIDEO_FORMAT_A420:
       return TRUE;
     case GST_VIDEO_FORMAT_RGBx:
     case GST_VIDEO_FORMAT_BGRx:
@@ -1100,6 +1106,7 @@ gst_video_format_has_alpha (GstVideoFormat format)
     case GST_VIDEO_FORMAT_BGRA:
     case GST_VIDEO_FORMAT_ARGB:
     case GST_VIDEO_FORMAT_ABGR:
+    case GST_VIDEO_FORMAT_A420:
       return TRUE;
     case GST_VIDEO_FORMAT_RGBx:
     case GST_VIDEO_FORMAT_BGRx:
@@ -1204,6 +1211,12 @@ gst_video_format_get_row_stride (GstVideoFormat format, int component,
       return GST_ROUND_UP_4 (width * 2);
     case GST_VIDEO_FORMAT_UYVP:
       return GST_ROUND_UP_4 ((width * 2 * 5 + 3) / 4);
+    case GST_VIDEO_FORMAT_A420:
+      if (component == 0 || component == 3) {
+        return GST_ROUND_UP_4 (width);
+      } else {
+        return GST_ROUND_UP_4 (GST_ROUND_UP_2 (width) / 2);
+      }
     default:
       return 0;
   }
@@ -1235,6 +1248,7 @@ gst_video_format_get_pixel_stride (GstVideoFormat format, int component)
     case GST_VIDEO_FORMAT_Y41B:
     case GST_VIDEO_FORMAT_Y42B:
     case GST_VIDEO_FORMAT_Y444:
+    case GST_VIDEO_FORMAT_A420:
       return 1;
     case GST_VIDEO_FORMAT_YUY2:
     case GST_VIDEO_FORMAT_YVYU:
@@ -1362,6 +1376,12 @@ gst_video_format_get_component_width (GstVideoFormat format,
     case GST_VIDEO_FORMAT_Y800:
     case GST_VIDEO_FORMAT_Y16:
       return width;
+    case GST_VIDEO_FORMAT_A420:
+      if (component == 0 || component == 1) {
+        return width;
+      } else {
+        return GST_ROUND_UP_2 (width) / 2;
+      }
     default:
       return 0;
   }
@@ -1430,6 +1450,12 @@ gst_video_format_get_component_height (GstVideoFormat format,
     case GST_VIDEO_FORMAT_Y16:
     case GST_VIDEO_FORMAT_UYVP:
       return height;
+    case GST_VIDEO_FORMAT_A420:
+      if (component == 0 || component == 1) {
+        return height;
+      } else {
+        return GST_ROUND_UP_2 (height) / 2;
+      }
     default:
       return 0;
   }
@@ -1632,6 +1658,22 @@ gst_video_format_get_component_offset (GstVideoFormat format,
     case GST_VIDEO_FORMAT_UYVP:
       /* UYVP is bit-packed, so this doesn't make sense */
       return 0;
+    case GST_VIDEO_FORMAT_A420:
+      if (component == 0)
+        return GST_ROUND_UP_4 (width) * GST_ROUND_UP_2 (height);
+      if (component == 1)
+        return GST_ROUND_UP_4 (width) * GST_ROUND_UP_2 (height);
+      if (component == 2) {
+        return GST_ROUND_UP_4 (width) * GST_ROUND_UP_2 (height) +
+            GST_ROUND_UP_4 (GST_ROUND_UP_2 (width) / 2) *
+            (GST_ROUND_UP_2 (height) / 2);
+      }
+      if (component == 3) {
+        return GST_ROUND_UP_4 (width) * GST_ROUND_UP_2 (height) +
+            2 * GST_ROUND_UP_4 (GST_ROUND_UP_2 (width) / 2) *
+            (GST_ROUND_UP_2 (height) / 2);
+
+      }
     default:
       return 0;
   }
@@ -1712,6 +1754,11 @@ gst_video_format_get_size (GstVideoFormat format, int width, int height)
       return GST_ROUND_UP_4 (width * 2) * height;
     case GST_VIDEO_FORMAT_UYVP:
       return GST_ROUND_UP_4 ((width * 2 * 5 + 3) / 4) * height;
+    case GST_VIDEO_FORMAT_A420:
+      size = 2 * GST_ROUND_UP_4 (width) * GST_ROUND_UP_2 (height);
+      size += GST_ROUND_UP_4 (GST_ROUND_UP_2 (width) / 2) *
+          (GST_ROUND_UP_2 (height) / 2) * 2;
+      return size;
     default:
       return 0;
   }
diff --git a/gst-libs/gst/video/video.h b/gst-libs/gst/video/video.h
index ea233a7ad9..85937a1f3a 100644
--- a/gst-libs/gst/video/video.h
+++ b/gst-libs/gst/video/video.h
@@ -64,6 +64,7 @@ G_BEGIN_DECLS
  * @GST_VIDEO_FORMAT_RGB15: rgb 5-5-5 bits per component (Since: 0.10.30)
  * @GST_VIDEO_FORMAT_BGR15: reverse rgb 5-5-5 bits per component (Since: 0.10.30)
  * @GST_VIDEO_FORMAT_UYVP: packed 10-bit 4:2:2 YUV (U0-Y0-V0-Y1 U2-Y2-V2-Y3 U4 ...) (Since: 0.10.31)
+ * @GST_VIDEO_FORMAT_A420: planar 4:4:2:0 AYUV (Since: 0.10.31)
  *
  * Enum value describing the most common video formats.
  */
@@ -102,7 +103,8 @@ typedef enum {
   GST_VIDEO_FORMAT_BGR16,
   GST_VIDEO_FORMAT_RGB15,
   GST_VIDEO_FORMAT_BGR15,
-  GST_VIDEO_FORMAT_UYVP
+  GST_VIDEO_FORMAT_UYVP,
+  GST_VIDEO_FORMAT_A420
 } GstVideoFormat;
 
 #define GST_VIDEO_BYTE1_MASK_32  "0xFF000000"