From ac140479276b735d583659d91885e3ab0a37dabe Mon Sep 17 00:00:00 2001
From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Sun, 23 Sep 2007 16:11:07 +0000
Subject: [PATCH] Fix decoding of VMDs representing sprites (Last Dynasty,
Woodruff).
Fixes issue 101
Originally committed as revision 10552 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
libavcodec/vmdav.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/libavcodec/vmdav.c b/libavcodec/vmdav.c
index 9507666cd47..c454be9b970 100644
--- a/libavcodec/vmdav.c
+++ b/libavcodec/vmdav.c
@@ -68,6 +68,7 @@ typedef struct VmdVideoContext {
unsigned char *unpack_buffer;
int unpack_buffer_size;
+ int x_off, y_off;
} VmdVideoContext;
#define QUEUE_SIZE 0x1000
@@ -207,6 +208,15 @@ static void vmd_decode(VmdVideoContext *s)
frame_width = AV_RL16(&s->buf[10]) - frame_x + 1;
frame_height = AV_RL16(&s->buf[12]) - frame_y + 1;
+ if ((frame_width == s->avctx->width && frame_height == s->avctx->height) &&
+ (frame_x || frame_y)) {
+
+ s->x_off = frame_x;
+ s->y_off = frame_y;
+ }
+ frame_x -= s->x_off;
+ frame_y -= s->y_off;
+
/* if only a certain region will be updated, copy the entire previous
* frame before the decode */
if (frame_x || frame_y || (frame_width != s->avctx->width) ||
--
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