From 57d549f538d5106749fab994fefdba8bbecb37dc Mon Sep 17 00:00:00 2001
From: Karl Blomster <kalle.blomster@gmail.com>
Date: Sat, 19 Sep 2009 21:34:40 +0000
Subject: [PATCH] unbreak the y4m provider

Originally committed to SVN as r3541.
---
 aegisub/src/video_provider_yuv4mpeg.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/aegisub/src/video_provider_yuv4mpeg.cpp b/aegisub/src/video_provider_yuv4mpeg.cpp
index 1eb2ed1fc..3bcbdfad4 100644
--- a/aegisub/src/video_provider_yuv4mpeg.cpp
+++ b/aegisub/src/video_provider_yuv4mpeg.cpp
@@ -123,9 +123,9 @@ void YUV4MPEGVideoProvider::LoadVideo(const wxString _filename) {
 		case Y4M_PIXFMT_420JPEG:
 		case Y4M_PIXFMT_420MPEG2:
 		case Y4M_PIXFMT_420PALDV:
-			chroma_sz	= (w * h) / 2; break;
+			chroma_sz	= (w * h) >> 2; break;
 		case Y4M_PIXFMT_422:
-			chroma_sz	= (w / 2) * h; break; // should be safe to assume that width is mod2
+			chroma_sz	= (w * h) >> 1; break;
 		/// @todo add support for more pixel formats
 		default:
 			throw wxString(_T("Unsupported pixel format"));