diff options
| author | Jonas Karlman <jonas@kwiboo.se> | 2019-11-06 23:34:21 +0100 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@kernel.org> | 2019-11-10 17:57:46 +0100 |
| commit | a8fe996084e358c6f4ec7c51ec28fd3c1ddf68d1 (patch) | |
| tree | ef4f19a9497b123b026bd3544e9a94169f10d19f | |
| parent | media: hantro: Fix H264 motion vector buffer offset (diff) | |
| download | linux-a8fe996084e358c6f4ec7c51ec28fd3c1ddf68d1.tar.xz linux-a8fe996084e358c6f4ec7c51ec28fd3c1ddf68d1.zip | |
media: hantro: Reduce H264 extra space for motion vectors
A decoded 8-bit 4:2:0 frame need memory for up to 448 bytes per
macroblock with additional 32 bytes on multi-core variants.
Memory layout is as follow:
+---------------------------+
| Y-plane 256 bytes x MBs |
+---------------------------+
| UV-plane 128 bytes x MBs |
+---------------------------+
| MV buffer 64 bytes x MBs |
+---------------------------+
| MC sync 32 bytes |
+---------------------------+
Reduce the extra space allocated now that motion vector buffer offset no
longer is based on the extra space.
Only allocate extra space for 64 bytes x MBs of motion vector buffer
and 32 bytes for multi-core sync.
Fixes: a9471e25629b ("media: hantro: Add core bits to support H264 decoding")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
| -rw-r--r-- | drivers/staging/media/hantro/hantro_v4l2.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/drivers/staging/media/hantro/hantro_v4l2.c b/drivers/staging/media/hantro/hantro_v4l2.c index fcf95c1d39ca..1dae76f20034 100644 --- a/drivers/staging/media/hantro/hantro_v4l2.c +++ b/drivers/staging/media/hantro/hantro_v4l2.c @@ -240,14 +240,30 @@ static int vidioc_try_fmt(struct file *file, void *priv, struct v4l2_format *f, v4l2_fill_pixfmt_mp(pix_mp, fmt->fourcc, pix_mp->width, pix_mp->height); /* + * A decoded 8-bit 4:2:0 NV12 frame may need memory for up to + * 448 bytes per macroblock with additional 32 bytes on + * multi-core variants. + * * The H264 decoder needs extra space on the output buffers * to store motion vectors. This is needed for reference * frames. + * + * Memory layout is as follow: + * + * +---------------------------+ + * | Y-plane 256 bytes x MBs | + * +---------------------------+ + * | UV-plane 128 bytes x MBs | + * +---------------------------+ + * | MV buffer 64 bytes x MBs | + * +---------------------------+ + * | MC sync 32 bytes | + * +---------------------------+ */ if (ctx->vpu_src_fmt->fourcc == V4L2_PIX_FMT_H264_SLICE) pix_mp->plane_fmt[0].sizeimage += - 128 * DIV_ROUND_UP(pix_mp->width, 16) * - DIV_ROUND_UP(pix_mp->height, 16); + 64 * MB_WIDTH(pix_mp->width) * + MB_WIDTH(pix_mp->height) + 32; } else if (!pix_mp->plane_fmt[0].sizeimage) { /* * For coded formats the application can specify |