media: cedrus: Adjust buffer size based on codec

In some cases decoding engine needs extra space in capture buffers. This
is the case for decoding 10-bit HEVC frames into 8-bit capture format.
This commit only adds infrastructure for such cases.
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/sunxi/cedrus/cedrus.h

@@ -162,6 +162,8 @@ struct cedrus_dec_ops {
 	int (*start)(struct cedrus_ctx *ctx);
 	void (*stop)(struct cedrus_ctx *ctx);
 	void (*trigger)(struct cedrus_ctx *ctx);
+	unsigned int (*extra_cap_size)(struct cedrus_ctx *ctx,
+				       struct v4l2_pix_format *pix_fmt);
 };
 
 struct cedrus_variant {

drivers/staging/media/sunxi/cedrus/cedrus_video.c

@@ -250,6 +250,10 @@ static int cedrus_try_fmt_vid_cap_p(struct cedrus_ctx *ctx,
 	pix_fmt->height = ctx->src_fmt.height;
 	cedrus_prepare_format(pix_fmt);
 
+	if (ctx->current_codec->extra_cap_size)
+		pix_fmt->sizeimage +=
+			ctx->current_codec->extra_cap_size(ctx, pix_fmt);
+
 	return 0;
 }