[FFmpeg-cvslog] Fix the size of workspace buffers in the motion pixels decoder.

[Laurent Aimar]

ffmpeg | branch: master | Laurent Aimar <fenrir at videolan.org> | Fri Sep 30 00:05:49 2011 +0200| [62234a4d3a30f3949694781ef8a941ef55b210fa] | committer: Michael Niedermayer

Fix the size of workspace buffers in the motion pixels decoder.

Some buffers must be mod 4 in width and/or height.

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=62234a4d3a30f3949694781ef8a941ef55b210fa
---

 libavcodec/motionpixels.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/libavcodec/motionpixels.c b/libavcodec/motionpixels.c
index 01d3c20..ff11528 100644
--- a/libavcodec/motionpixels.c
+++ b/libavcodec/motionpixels.c
@@ -52,14 +52,16 @@ typedef struct MotionPixelsContext {
 static av_cold int mp_decode_init(AVCodecContext *avctx)
 {
     MotionPixelsContext *mp = avctx->priv_data;
+    int w4 = (avctx->width  + 3) & ~3;
+    int h4 = (avctx->height + 3) & ~3;
 
     motionpixels_tableinit();
     mp->avctx = avctx;
     dsputil_init(&mp->dsp, avctx);
-    mp->changes_map = av_mallocz(avctx->width * avctx->height);
+    mp->changes_map = av_mallocz(avctx->width * h4);
     mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
     mp->vpt = av_mallocz(avctx->height * sizeof(YuvPixel));
-    mp->hpt = av_mallocz(avctx->height * avctx->width / 16 * sizeof(YuvPixel));
+    mp->hpt = av_mallocz(h4 * w4 / 16 * sizeof(YuvPixel));
     avctx->pix_fmt = PIX_FMT_RGB555;
     avcodec_get_frame_defaults(&mp->frame);
     return 0;