lavc/qsv: set mjpeg height/width alignment

height/width alignment will be used in submit_frame(), copying to a padded
frame as libmfx requires.
It is to fix the segment fault issue when encoding some rawvideos.

Reproduce:  -f rawvideo -video_size 1920x1080 -pix_fmt nv12  -i
1920x1080_blue_sky_nv12.yuv -init_hw_device qsv:hw -c:v
mjpeg_qsv -global_quality 80 test.mjpeg

Signed-off-by: Zhong Li <zhong.li@intel.com>

Author: lizhong1008

libavcodec/qsvenc.c

@@ -412,6 +412,10 @@ static int init_video_param_jpeg(AVCodecContext *avctx, QSVEncContext *q)
     q->param.mfx.FrameInfo.BitDepthChroma = desc->comp[0].depth;
     q->param.mfx.FrameInfo.Shift          = desc->comp[0].depth > 8;
 
+    q->width_align = q->height_align = 16;
+    q->param.mfx.FrameInfo.Width = FFALIGN(avctx->width, q->width_align);
+    q->param.mfx.FrameInfo.Height = FFALIGN(avctx->height, q->height_align);
+
     q->param.mfx.FrameInfo.Width  = FFALIGN(avctx->width, 16);
     q->param.mfx.FrameInfo.Height = FFALIGN(avctx->height, 16);