Re: [PATCH v10 06/17] media: uapi: HEVC: Change pic_order_cnt definition in v4l2_hevc_dpb_entry

[Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>]

On Tue, Jul 05, 2022 at 10:54:09AM +0200, Benjamin Gaignard wrote:
> The HEVC specification describes the following:
> "PicOrderCntVal is derived as follows:
> PicOrderCntVal = PicOrderCntMsb + slice_pic_order_cnt_lsb
> The value of PicOrderCntVal shall be in the range of −2^31 to 2^31 − 1, inclusive."
> 
> To match with these definitions change __u16 pic_order_cnt[2]
> into __s32 pic_order_cnt_val.
> Change v4l2_ctrl_hevc_slice_params->slice_pic_order_cnt to __s32 too.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
> Acked-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
> Tested-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Good catch.

Reviewed-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>

> ---
>  Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst | 2 +-
>  drivers/staging/media/hantro/hantro_g2_hevc_dec.c         | 7 +++----
>  drivers/staging/media/hantro/hantro_hevc.c                | 2 +-
>  drivers/staging/media/hantro/hantro_hw.h                  | 4 ++--
>  drivers/staging/media/sunxi/cedrus/cedrus_h265.c          | 4 ++--
>  include/media/hevc-ctrls.h                                | 4 ++--
>  6 files changed, 11 insertions(+), 12 deletions(-)
> 
> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> index 868669ae6831..3dfb81a93935 100644
> --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> @@ -3010,7 +3010,7 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
>      * - __u8
>        - ``colour_plane_id``
>        -
> -    * - __u16
> +    * - __s32
>        - ``slice_pic_order_cnt``
>        -
>      * - __u8
> diff --git a/drivers/staging/media/hantro/hantro_g2_hevc_dec.c b/drivers/staging/media/hantro/hantro_g2_hevc_dec.c
> index 5df6f08e26f5..d28653d04d20 100644
> --- a/drivers/staging/media/hantro/hantro_g2_hevc_dec.c
> +++ b/drivers/staging/media/hantro/hantro_g2_hevc_dec.c
> @@ -390,11 +390,10 @@ static int set_ref(struct hantro_ctx *ctx)
>  			 !!(pps->flags & V4L2_HEVC_PPS_FLAG_LOOP_FILTER_ACROSS_TILES_ENABLED));
>  
>  	/*
> -	 * Write POC count diff from current pic. For frame decoding only compute
> -	 * pic_order_cnt[0] and ignore pic_order_cnt[1] used in field-coding.
> +	 * Write POC count diff from current pic.
>  	 */
>  	for (i = 0; i < decode_params->num_active_dpb_entries && i < ARRAY_SIZE(cur_poc); i++) {
> -		char poc_diff = decode_params->pic_order_cnt_val - dpb[i].pic_order_cnt[0];
> +		char poc_diff = decode_params->pic_order_cnt_val - dpb[i].pic_order_cnt_val;
>  
>  		hantro_reg_write(vpu, &cur_poc[i], poc_diff);
>  	}
> @@ -421,7 +420,7 @@ static int set_ref(struct hantro_ctx *ctx)
>  	dpb_longterm_e = 0;
>  	for (i = 0; i < decode_params->num_active_dpb_entries &&
>  	     i < (V4L2_HEVC_DPB_ENTRIES_NUM_MAX - 1); i++) {
> -		luma_addr = hantro_hevc_get_ref_buf(ctx, dpb[i].pic_order_cnt[0]);
> +		luma_addr = hantro_hevc_get_ref_buf(ctx, dpb[i].pic_order_cnt_val);
>  		if (!luma_addr)
>  			return -ENOMEM;
>  
> diff --git a/drivers/staging/media/hantro/hantro_hevc.c b/drivers/staging/media/hantro/hantro_hevc.c
> index 1df87ca88ebf..5984c5fa6f83 100644
> --- a/drivers/staging/media/hantro/hantro_hevc.c
> +++ b/drivers/staging/media/hantro/hantro_hevc.c
> @@ -33,7 +33,7 @@ void hantro_hevc_ref_init(struct hantro_ctx *ctx)
>  }
>  
>  dma_addr_t hantro_hevc_get_ref_buf(struct hantro_ctx *ctx,
> -				   int poc)
> +				   s32 poc)
>  {
>  	struct hantro_hevc_dec_hw_ctx *hevc_dec = &ctx->hevc_dec;
>  	int i;
> diff --git a/drivers/staging/media/hantro/hantro_hw.h b/drivers/staging/media/hantro/hantro_hw.h
> index a2e0f0836281..33d156ccbfeb 100644
> --- a/drivers/staging/media/hantro/hantro_hw.h
> +++ b/drivers/staging/media/hantro/hantro_hw.h
> @@ -145,7 +145,7 @@ struct hantro_hevc_dec_hw_ctx {
>  	struct hantro_aux_buf tile_bsd;
>  	struct hantro_aux_buf ref_bufs[NUM_REF_PICTURES];
>  	struct hantro_aux_buf scaling_lists;
> -	int ref_bufs_poc[NUM_REF_PICTURES];
> +	s32 ref_bufs_poc[NUM_REF_PICTURES];
>  	u32 ref_bufs_used;
>  	struct hantro_hevc_dec_ctrls ctrls;
>  	unsigned int num_tile_cols_allocated;
> @@ -357,7 +357,7 @@ void hantro_hevc_dec_exit(struct hantro_ctx *ctx);
>  int hantro_g2_hevc_dec_run(struct hantro_ctx *ctx);
>  int hantro_hevc_dec_prepare_run(struct hantro_ctx *ctx);
>  void hantro_hevc_ref_init(struct hantro_ctx *ctx);
> -dma_addr_t hantro_hevc_get_ref_buf(struct hantro_ctx *ctx, int poc);
> +dma_addr_t hantro_hevc_get_ref_buf(struct hantro_ctx *ctx, s32 poc);
>  int hantro_hevc_add_ref_buf(struct hantro_ctx *ctx, int poc, dma_addr_t addr);
>  int hantro_hevc_validate_sps(struct hantro_ctx *ctx, const struct v4l2_ctrl_hevc_sps *sps);
>  
> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
> index 44f385be9f6c..411601975124 100644
> --- a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
> +++ b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
> @@ -143,8 +143,8 @@ static void cedrus_h265_frame_info_write_dpb(struct cedrus_ctx *ctx,
>  	for (i = 0; i < num_active_dpb_entries; i++) {
>  		int buffer_index = vb2_find_timestamp(vq, dpb[i].timestamp, 0);
>  		u32 pic_order_cnt[2] = {
> -			dpb[i].pic_order_cnt[0],
> -			dpb[i].pic_order_cnt[1]
> +			dpb[i].pic_order_cnt_val,
> +			dpb[i].pic_order_cnt_val
>  		};
>  
>  		cedrus_h265_frame_info_write_single(ctx, i, dpb[i].field_pic,
> diff --git a/include/media/hevc-ctrls.h b/include/media/hevc-ctrls.h
> index 45734bd8fdfc..01c1795c57a9 100644
> --- a/include/media/hevc-ctrls.h
> +++ b/include/media/hevc-ctrls.h
> @@ -138,7 +138,7 @@ struct v4l2_hevc_dpb_entry {
>  	__u64	timestamp;
>  	__u8	flags;
>  	__u8	field_pic;
> -	__u16	pic_order_cnt[2];
> +	__s32	pic_order_cnt_val;
>  	__u8	padding[2];
>  };
>  
> @@ -181,7 +181,7 @@ struct v4l2_ctrl_hevc_slice_params {
>  	/* ISO/IEC 23008-2, ITU-T Rec. H.265: General slice segment header */
>  	__u8	slice_type;
>  	__u8	colour_plane_id;
> -	__u16	slice_pic_order_cnt;
> +	__s32	slice_pic_order_cnt;
>  	__u8	num_ref_idx_l0_active_minus1;
>  	__u8	num_ref_idx_l1_active_minus1;
>  	__u8	collocated_ref_idx;
> -- 
> 2.32.0
>