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media: uapi: Change data_bit_offset definition

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'F.7.3.6.1 General slice segment header syntax' section of HEVC
specification describes that a slice header always end aligned on
byte boundary, therefore we only need to provide the data offset in bytes.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
Reviewed-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Acked-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Tested-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>
This commit is contained in:
Benjamin Gaignard 2022-07-08 17:21:55 +01:00 committed by Mauro Carvalho Chehab
parent 13789e3070
commit e7060d9a78
4 changed files with 22 additions and 6 deletions
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4
Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
View file

@ -3008,8 +3008,8 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
- ``bit_size``
- Size (in bits) of the current slice data.
* - __u32
- ``data_bit_offset``
- Offset (in bits) to the video data in the current slice data.
- ``data_byte_offset``
- Offset (in bytes) to the video data in the current slice data.
* - __u32
- ``num_entry_point_offsets``
- Specifies the number of entry point offset syntax elements in the slice header.

19
drivers/staging/media/sunxi/cedrus/cedrus_h265.c
View file

@ -317,6 +317,8 @@ static void cedrus_h265_setup(struct cedrus_ctx *ctx,
u32 chroma_log2_weight_denom;
u32 output_pic_list_index;
u32 pic_order_cnt[2];
u8 *padding;
int count;
u32 reg;
sps = run->h265.sps;
@ -405,7 +407,22 @@ static void cedrus_h265_setup(struct cedrus_ctx *ctx,
/* Initialize bitstream access. */
cedrus_write(dev, VE_DEC_H265_TRIGGER, VE_DEC_H265_TRIGGER_INIT_SWDEC);
cedrus_h265_skip_bits(dev, slice_params->data_bit_offset);
/*
* Cedrus expects that bitstream pointer is actually at the end of the slice header
* instead of start of slice data. Padding is 8 bits at most (one bit set to 1 and
* at most seven bits set to 0), so we have to inspect only one byte before slice data.
*/
padding = (u8 *)vb2_plane_vaddr(&run->src->vb2_buf, 0) +
slice_params->data_byte_offset - 1;
for (count = 0; count < 8; count++)
if (*padding & (1 << count))
break;
/* Include the one bit. */
count++;
cedrus_h265_skip_bits(dev, slice_params->data_byte_offset * 8 - count);
/* Bitstream parameters. */

1
drivers/staging/media/sunxi/cedrus/cedrus_video.c
View file

@ -568,7 +568,6 @@ int cedrus_queue_init(void *priv, struct vb2_queue *src_vq,
src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
src_vq->dma_attrs = DMA_ATTR_NO_KERNEL_MAPPING;
src_vq->drv_priv = ctx;
src_vq->buf_struct_size = sizeof(struct cedrus_buffer);
src_vq->ops = &cedrus_qops;

4
include/media/hevc-ctrls.h
View file

@ -310,7 +310,7 @@ struct v4l2_hevc_pred_weight_table {
* V4L2_CTRL_FLAG_DYNAMIC_ARRAY flag must be set when using it.
*
* @bit_size: size (in bits) of the current slice data
* @data_bit_offset: offset (in bits) to the video data in the current slice data
* @data_byte_offset: offset (in bytes) to the video data in the current slice data
* @num_entry_point_offsets: specifies the number of entry point offset syntax
* elements in the slice header.
* @nal_unit_type: specifies the coding type of the slice (B, P or I)
@ -356,7 +356,7 @@ struct v4l2_hevc_pred_weight_table {
*/
struct v4l2_ctrl_hevc_slice_params {
__u32 bit_size;
__u32 data_bit_offset;
__u32 data_byte_offset;
__u32 num_entry_point_offsets;
/* ISO/IEC 23008-2, ITU-T Rec. H.265: NAL unit header */
__u8 nal_unit_type;