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Subject: Re: [PATCH v2 1/9] media: hevc: Modify structures to follow H265 ITU
 spec
To:     John Cox <jc@kynesim.co.uk>
Cc:     ezequiel@collabora.com, p.zabel@pengutronix.de, mchehab@kernel.org,
        robh+dt@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de,
        kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com,
        gregkh@linuxfoundation.org, mripard@kernel.org,
        paul.kocialkowski@bootlin.com, wens@csie.org,
        jernej.skrabec@siol.net, peng.fan@nxp.com,
        hverkuil-cisco@xs4all.nl, dan.carpenter@oracle.com,
        linux-media@vger.kernel.org, linux-rockchip@lists.infradead.org,
        devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, kernel@collabora.com
References: <20210218191844.297869-1-benjamin.gaignard@collabora.com>
 <20210218191844.297869-2-benjamin.gaignard@collabora.com>
 <cam73g1am20fqav4bsoakml5natvtgq4qq@4ax.com>
From:   Benjamin Gaignard <benjamin.gaignard@collabora.com>
Message-ID: <4cd4a009-9552-03a5-a49d-de16c55c63da@collabora.com>
Date:   Mon, 22 Feb 2021 17:39:23 +0100
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Le 22/02/2021 à 17:24, John Cox a écrit :
>> The H.265 ITU specification (section 7.4) define the general
>> slice segment header semantics.
>> Modified/added fields are:
>> - video_parameter_set_id: (7.4.3.1) identifies the VPS for
>> reference by other syntax elements.
>> - seq_parameter_set_id: (7.4.3.2.1) specifies the value of
>> the vps_video_parameter_set_id of the active VPS.
>> - chroma_format_idc: (7.4.3.2.1) specifies the chroma sampling
>> relative to the luma sampling
>> - pic_parameter_set_id: (7.4.3.3.1) identifies the PPS for
>> reference by other syntax elements
>> - num_ref_idx_l0_default_active_minus1: (7.4.3.3.1) specifies
>> the inferred value of num_ref_idx_l0_active_minus1
>> - num_ref_idx_l1_default_active_minus1: (7.4.3.3.1) specifies
>> the inferred value of num_ref_idx_l1_active_minus1
>> - slice_segment_addr: (7.4.7.1) specifies the address of
>> the first coding tree block in the slice segment
>> - num_entry_point_offsets: (7.4.7.1) specifies the number of
>> entry_point_offset_minus1[ i ] syntax elements in the slice header
>>
>> Add HEVC decode params contains the information used in section
>> "8.3 Slice decoding process" of the specification to let the hardware
>> perform decoding of a slices.
>>
>> Adapt Cedrus driver according to these changes.
>>
>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
>> ---
>> version 2:
>> - remove all change related to scaling
>> - squash commits to a coherent split
>> - be more verbose about the added fields
>>
>> drivers/media/v4l2-core/v4l2-ctrls.c          | 26 ++++++++---
>> drivers/staging/media/sunxi/cedrus/cedrus.c   |  6 +++
>> drivers/staging/media/sunxi/cedrus/cedrus.h   |  1 +
>> .../staging/media/sunxi/cedrus/cedrus_dec.c   |  2 +
>> .../staging/media/sunxi/cedrus/cedrus_h265.c  |  6 ++-
>> include/media/hevc-ctrls.h                    | 45 +++++++++++++++----
>> 6 files changed, 69 insertions(+), 17 deletions(-)
>>
>> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
>> index 016cf6204cbb..4060b5bcc3c0 100644
>> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
>> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
>> @@ -1028,6 +1028,7 @@ const char *v4l2_ctrl_get_name(u32 id)
>> 	case V4L2_CID_MPEG_VIDEO_HEVC_SPS:			return "HEVC Sequence Parameter Set";
>> 	case V4L2_CID_MPEG_VIDEO_HEVC_PPS:			return "HEVC Picture Parameter Set";
>> 	case V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS:		return "HEVC Slice Parameters";
>> +	case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_PARAMS:		return "HEVC Decode Parameters";
>> 	case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE:		return "HEVC Decode Mode";
>> 	case V4L2_CID_MPEG_VIDEO_HEVC_START_CODE:		return "HEVC Start Code";
>>
>> @@ -1482,6 +1483,9 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
>> 	case V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS:
>> 		*type = V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS;
>> 		break;
>> +	case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_PARAMS:
>> +		*type = V4L2_CTRL_TYPE_HEVC_DECODE_PARAMS;
>> +		break;
>> 	case V4L2_CID_UNIT_CELL_SIZE:
>> 		*type = V4L2_CTRL_TYPE_AREA;
>> 		*flags |= V4L2_CTRL_FLAG_READ_ONLY;
>> @@ -1833,6 +1837,7 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
>> 	struct v4l2_ctrl_hevc_sps *p_hevc_sps;
>> 	struct v4l2_ctrl_hevc_pps *p_hevc_pps;
>> 	struct v4l2_ctrl_hevc_slice_params *p_hevc_slice_params;
>> +	struct v4l2_ctrl_hevc_decode_params *p_hevc_decode_params;
>> 	struct v4l2_area *area;
>> 	void *p = ptr.p + idx * ctrl->elem_size;
>> 	unsigned int i;
>> @@ -2108,23 +2113,27 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
>> 		zero_padding(*p_hevc_pps);
>> 		break;
>>
>> -	case V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS:
>> -		p_hevc_slice_params = p;
>> +	case V4L2_CTRL_TYPE_HEVC_DECODE_PARAMS:
>> +		p_hevc_decode_params = p;
>>
>> -		if (p_hevc_slice_params->num_active_dpb_entries >
>> +		if (p_hevc_decode_params->num_active_dpb_entries >
>> 		    V4L2_HEVC_DPB_ENTRIES_NUM_MAX)
>> 			return -EINVAL;
>>
>> -		zero_padding(p_hevc_slice_params->pred_weight_table);
>> -
>> -		for (i = 0; i < p_hevc_slice_params->num_active_dpb_entries;
>> +		for (i = 0; i < p_hevc_decode_params->num_active_dpb_entries;
>> 		     i++) {
>> 			struct v4l2_hevc_dpb_entry *dpb_entry =
>> -				&p_hevc_slice_params->dpb[i];
>> +				&p_hevc_decode_params->dpb[i];
>>
>> 			zero_padding(*dpb_entry);
>> 		}
>>
>> +		break;
>> +
>> +	case V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS:
>> +		p_hevc_slice_params = p;
>> +
>> +		zero_padding(p_hevc_slice_params->pred_weight_table);
>> 		zero_padding(*p_hevc_slice_params);
>> 		break;
>>
>> @@ -2821,6 +2830,9 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
>> 	case V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS:
>> 		elem_size = sizeof(struct v4l2_ctrl_hevc_slice_params);
>> 		break;
>> +	case V4L2_CTRL_TYPE_HEVC_DECODE_PARAMS:
>> +		elem_size = sizeof(struct v4l2_ctrl_hevc_decode_params);
>> +		break;
>> 	case V4L2_CTRL_TYPE_AREA:
>> 		elem_size = sizeof(struct v4l2_area);
>> 		break;
>> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.c b/drivers/staging/media/sunxi/cedrus/cedrus.c
>> index 7bd9291c8d5f..4cd3cab1a257 100644
>> --- a/drivers/staging/media/sunxi/cedrus/cedrus.c
>> +++ b/drivers/staging/media/sunxi/cedrus/cedrus.c
>> @@ -151,6 +151,12 @@ static const struct cedrus_control cedrus_controls[] = {
>> 		},
>> 		.codec		= CEDRUS_CODEC_VP8,
>> 	},
>> +	{
>> +		.cfg = {
>> +			.id = V4L2_CID_MPEG_VIDEO_HEVC_DECODE_PARAMS,
>> +		},
>> +		.codec		= CEDRUS_CODEC_H265,
>> +	},
>> };
>>
>> #define CEDRUS_CONTROLS_COUNT	ARRAY_SIZE(cedrus_controls)
>> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.h b/drivers/staging/media/sunxi/cedrus/cedrus.h
>> index 251a6a660351..2ca33ac38b9a 100644
>> --- a/drivers/staging/media/sunxi/cedrus/cedrus.h
>> +++ b/drivers/staging/media/sunxi/cedrus/cedrus.h
>> @@ -76,6 +76,7 @@ struct cedrus_h265_run {
>> 	const struct v4l2_ctrl_hevc_sps			*sps;
>> 	const struct v4l2_ctrl_hevc_pps			*pps;
>> 	const struct v4l2_ctrl_hevc_slice_params	*slice_params;
>> +	const struct v4l2_ctrl_hevc_decode_params	*decode_params;
>> };
>>
>> struct cedrus_vp8_run {
>> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_dec.c b/drivers/staging/media/sunxi/cedrus/cedrus_dec.c
>> index a9090daf626a..cd821f417a14 100644
>> --- a/drivers/staging/media/sunxi/cedrus/cedrus_dec.c
>> +++ b/drivers/staging/media/sunxi/cedrus/cedrus_dec.c
>> @@ -68,6 +68,8 @@ void cedrus_device_run(void *priv)
>> 			V4L2_CID_MPEG_VIDEO_HEVC_PPS);
>> 		run.h265.slice_params = cedrus_find_control_data(ctx,
>> 			V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS);
>> +		run.h265.decode_params = cedrus_find_control_data(ctx,
>> +			V4L2_CID_MPEG_VIDEO_HEVC_DECODE_PARAMS);
>> 		break;
>>
>> 	case V4L2_PIX_FMT_VP8_FRAME:
>> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
>> index ce497d0197df..dce5db6be13a 100644
>> --- a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
>> +++ b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
>> @@ -245,6 +245,7 @@ static void cedrus_h265_setup(struct cedrus_ctx *ctx,
>> 	const struct v4l2_ctrl_hevc_sps *sps;
>> 	const struct v4l2_ctrl_hevc_pps *pps;
>> 	const struct v4l2_ctrl_hevc_slice_params *slice_params;
>> +	const struct v4l2_ctrl_hevc_decode_params *decode_params;
>> 	const struct v4l2_hevc_pred_weight_table *pred_weight_table;
>> 	dma_addr_t src_buf_addr;
>> 	dma_addr_t src_buf_end_addr;
>> @@ -256,6 +257,7 @@ static void cedrus_h265_setup(struct cedrus_ctx *ctx,
>> 	sps = run->h265.sps;
>> 	pps = run->h265.pps;
>> 	slice_params = run->h265.slice_params;
>> +	decode_params = run->h265.decode_params;
>> 	pred_weight_table = &slice_params->pred_weight_table;
>>
>> 	/* MV column buffer size and allocation. */
>> @@ -487,7 +489,7 @@ static void cedrus_h265_setup(struct cedrus_ctx *ctx,
>>
>> 	reg = VE_DEC_H265_DEC_SLICE_HDR_INFO1_SLICE_TC_OFFSET_DIV2(slice_params->slice_tc_offset_div2) |
>> 	      VE_DEC_H265_DEC_SLICE_HDR_INFO1_SLICE_BETA_OFFSET_DIV2(slice_params->slice_beta_offset_div2) |
>> -	      VE_DEC_H265_DEC_SLICE_HDR_INFO1_SLICE_POC_BIGEST_IN_RPS_ST(slice_params->num_rps_poc_st_curr_after == 0) |
>> +	      VE_DEC_H265_DEC_SLICE_HDR_INFO1_SLICE_POC_BIGEST_IN_RPS_ST(decode_params->num_rps_poc_st_curr_after == 0) |
>> 	      VE_DEC_H265_DEC_SLICE_HDR_INFO1_SLICE_CR_QP_OFFSET(slice_params->slice_cr_qp_offset) |
>> 	      VE_DEC_H265_DEC_SLICE_HDR_INFO1_SLICE_CB_QP_OFFSET(slice_params->slice_cb_qp_offset) |
>> 	      VE_DEC_H265_DEC_SLICE_HDR_INFO1_SLICE_QP_DELTA(slice_params->slice_qp_delta);
>> @@ -528,7 +530,7 @@ static void cedrus_h265_setup(struct cedrus_ctx *ctx,
>>
>> 	/* Write decoded picture buffer in pic list. */
>> 	cedrus_h265_frame_info_write_dpb(ctx, slice_params->dpb,
>> -					 slice_params->num_active_dpb_entries);
>> +					 decode_params->num_active_dpb_entries);
>>
>> 	/* Output frame. */
>>
>> diff --git a/include/media/hevc-ctrls.h b/include/media/hevc-ctrls.h
>> index b4cb2ef02f17..7fe704a08f77 100644
>> --- a/include/media/hevc-ctrls.h
>> +++ b/include/media/hevc-ctrls.h
>> @@ -19,6 +19,7 @@
>> #define V4L2_CID_MPEG_VIDEO_HEVC_SPS		(V4L2_CID_CODEC_BASE + 1008)
>> #define V4L2_CID_MPEG_VIDEO_HEVC_PPS		(V4L2_CID_CODEC_BASE + 1009)
>> #define V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS	(V4L2_CID_CODEC_BASE + 1010)
>> +#define V4L2_CID_MPEG_VIDEO_HEVC_DECODE_PARAMS	(V4L2_CID_CODEC_BASE + 1012)
>> #define V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE	(V4L2_CID_CODEC_BASE + 1015)
>> #define V4L2_CID_MPEG_VIDEO_HEVC_START_CODE	(V4L2_CID_CODEC_BASE + 1016)
>>
>> @@ -26,6 +27,7 @@
>> #define V4L2_CTRL_TYPE_HEVC_SPS 0x0120
>> #define V4L2_CTRL_TYPE_HEVC_PPS 0x0121
>> #define V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS 0x0122
>> +#define V4L2_CTRL_TYPE_HEVC_DECODE_PARAMS 0x0124
>>
>> enum v4l2_mpeg_video_hevc_decode_mode {
>> 	V4L2_MPEG_VIDEO_HEVC_DECODE_MODE_SLICE_BASED,
>> @@ -54,6 +56,9 @@ enum v4l2_mpeg_video_hevc_start_code {
>> /* The controls are not stable at the moment and will likely be reworked. */
>> struct v4l2_ctrl_hevc_sps {
>> 	/* ISO/IEC 23008-2, ITU-T Rec. H.265: Sequence parameter set */
>> +	__u8	video_parameter_set_id;
> Whilst I don't object to the addition of vps id why do we need
> it if the VPS is never passed?

You are right I could remove it.

>
>> +	__u8	seq_parameter_set_id;
>> +	__u8	chroma_format_idc;
>> 	__u16	pic_width_in_luma_samples;
>> 	__u16	pic_height_in_luma_samples;
>> 	__u8	bit_depth_luma_minus8;
>> @@ -74,9 +79,9 @@ struct v4l2_ctrl_hevc_sps {
>> 	__u8	log2_diff_max_min_pcm_luma_coding_block_size;
>> 	__u8	num_short_term_ref_pic_sets;
>> 	__u8	num_long_term_ref_pics_sps;
>> -	__u8	chroma_format_idc;
>>
>> -	__u8	padding;
>> +	__u8	num_slices;
>> +	__u8	padding[6];
>>
>> 	__u64	flags;
>> };
>> @@ -100,10 +105,15 @@ struct v4l2_ctrl_hevc_sps {
>> #define V4L2_HEVC_PPS_FLAG_PPS_DISABLE_DEBLOCKING_FILTER	(1ULL << 16)
>> #define V4L2_HEVC_PPS_FLAG_LISTS_MODIFICATION_PRESENT		(1ULL << 17)
>> #define V4L2_HEVC_PPS_FLAG_SLICE_SEGMENT_HEADER_EXTENSION_PRESENT (1ULL << 18)
>> +#define V4L2_HEVC_PPS_FLAG_DEBLOCKING_FILTER_CONTROL_PRESENT	(1ULL << 19)
>> +#define V4L2_HEVC_PPS_FLAG_UNIFORM_SPACING			(1ULL << 20)
>>
>> struct v4l2_ctrl_hevc_pps {
>> 	/* ISO/IEC 23008-2, ITU-T Rec. H.265: Picture parameter set */
>> +	__u8	pic_parameter_set_id;
>> 	__u8	num_extra_slice_header_bits;
>> +	__u8	num_ref_idx_l0_default_active_minus1;
>> +	__u8	num_ref_idx_l1_default_active_minus1;
>> 	__s8	init_qp_minus26;
>> 	__u8	diff_cu_qp_delta_depth;
>> 	__s8	pps_cb_qp_offset;
>> @@ -116,7 +126,7 @@ struct v4l2_ctrl_hevc_pps {
>> 	__s8	pps_tc_offset_div2;
>> 	__u8	log2_parallel_merge_level_minus2;
>>
>> -	__u8	padding[4];
>> +	__u8	padding;
>> 	__u64	flags;
>> };
>>
>> @@ -165,6 +175,10 @@ struct v4l2_ctrl_hevc_slice_params {
>> 	__u32	bit_size;
>> 	__u32	data_bit_offset;
>>
>> +	/* ISO/IEC 23008-2, ITU-T Rec. H.265: General slice segment header */
>> +	__u32	slice_segment_addr;
>> +	__u32	num_entry_point_offsets;
>> +
>> 	/* ISO/IEC 23008-2, ITU-T Rec. H.265: NAL unit header */
>> 	__u8	nal_unit_type;
>> 	__u8	nuh_temporal_id_plus1;
>> @@ -190,15 +204,13 @@ struct v4l2_ctrl_hevc_slice_params {
>> 	__u8	pic_struct;
>>
>> 	/* ISO/IEC 23008-2, ITU-T Rec. H.265: General slice segment header */
>> -	__u8	num_active_dpb_entries;
>> 	__u8	ref_idx_l0[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
>> 	__u8	ref_idx_l1[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
>>
>> -	__u8	num_rps_poc_st_curr_before;
>> -	__u8	num_rps_poc_st_curr_after;
>> -	__u8	num_rps_poc_lt_curr;
>> +	__u16	short_term_ref_pic_set_size;
>> +	__u16	long_term_ref_pic_set_size;
>>
>> -	__u8	padding;
>> +	__u8	padding[5];
>>
>> 	/* ISO/IEC 23008-2, ITU-T Rec. H.265: General slice segment header */
>> 	struct v4l2_hevc_dpb_entry dpb[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
>> @@ -209,4 +221,21 @@ struct v4l2_ctrl_hevc_slice_params {
>> 	__u64	flags;
>> };
>>
>> +#define V4L2_HEVC_DECODE_PARAM_FLAG_IRAP_PIC		0x1
>> +#define V4L2_HEVC_DECODE_PARAM_FLAG_IDR_PIC		0x2
>> +#define V4L2_HEVC_DECODE_PARAM_FLAG_NO_OUTPUT_OF_PRIOR  0x4
>> +
>> +struct v4l2_ctrl_hevc_decode_params {
>> +	__s32	pic_order_cnt_val;
>> +	__u8	num_active_dpb_entries;
>> +	struct	v4l2_hevc_dpb_entry dpb[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
>> +	__u8	num_rps_poc_st_curr_before;
>> +	__u8	num_rps_poc_st_curr_after;
>> +	__u8	num_rps_poc_lt_curr;
>> +	__u8	rps_st_curr_before[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
>> +	__u8	rps_st_curr_after[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
>> +	__u8	rps_lt_curr[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];
>> +	__u64	flags;
>> +};
>> +
>> #endif
> While you are adding stuff is there any chance you could also add:
>
> #define V4L2_HEVC_SLICE_PARAMS_FLAG_DEPENDENT_SLICE_SEGMENT	(1ULL << 9)
>
> to the slice flags?  The rpi H265 decoder needs it to deal with
> cases where dependant_slice_segment is set in the slice header.

Remarks on previous versions suggest to only add what it is used by driver
(like scaling feature) so I will wait to have an usage of this flag to introduce it.

Benjamin

>
> Thanks
>
> John Cox
>