From 16e83cbbc4023ab89c0ac7c193ab02e22ce72790 Mon Sep 17 00:00:00 2001
From: Philip Gladstone <philipjsg@users.sourceforge.net>
Date: Sat, 8 Feb 2003 15:34:25 +0000
Subject: [PATCH] Fix a bug in the conversion of rgba32->yuv420p. This resulted
 in garbage images when this conversion was used. I suspect that the same bug
 may be lurking in other conversions. [The assumption was that the linesize
 was equal to the width for both the source and destination images. This turns
 out not to be true in some cases.]

Originally committed as revision 1556 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavcodec/imgconvert.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/libavcodec/imgconvert.c b/libavcodec/imgconvert.c
index 401963193..5a09486aa 100644
--- a/libavcodec/imgconvert.c
+++ b/libavcodec/imgconvert.c
@@ -574,8 +574,8 @@ static void rgb_name ## _to_yuv420p(AVPicture *dst, AVPicture *src,     \
     cb = dst->data[1];                                                  \
     cr = dst->data[2];                                                  \
                                                                         \
-    wrap = width;                                                       \
-    wrap3 = width * BPP;                                                \
+    wrap = dst->linesize[0];                                            \
+    wrap3 = src->linesize[0];                                           \
     p = src->data[0];                                                   \
     for(y=0;y<height;y+=2) {                                            \
         for(x=0;x<width;x+=2) {                                         \
@@ -620,8 +620,10 @@ static void rgb_name ## _to_yuv420p(AVPicture *dst, AVPicture *src,     \
             p += -wrap3 + 2 * BPP;                                      \
             lum += -wrap + 2;                                           \
         }                                                               \
-        p += wrap3;                                                     \
-        lum += wrap;                                                    \
+        p += wrap3 + (wrap3 - width * BPP);                             \
+        lum += wrap + (wrap - width);                                   \
+        cb += dst->linesize[1] - width / 2;                             \
+        cr += dst->linesize[2] - width / 2;                             \
     }                                                                   \
 }                                                                       \
                                                                         \
-- 
2.11.0