Re: [RFC] media: uapi: Add VP8 low-level decoder API compound controls.

[Nicolas Dufresne <nicolas@ndufresne.ca>]

[-- Attachment #1: Type: text/plain, Size: 8655 bytes --]

Le mercredi 13 février 2019 à 18:15 -0300, Ezequiel Garcia a écrit :
> From: Pawel Osciak <posciak@chromium.org>
> 
> These controls are to be used with the new low-level decoder API for VP8
> to provide additional parameters for the hardware that cannot parse the
> input stream.
> 
> Signed-off-by: Pawel Osciak <posciak@chromium.org>
> [ezequiel: rebased]
> Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>
> ---
> As the H.264 interface is hopefully close to be merged,
> I'm sending the VP8 interface to start this discussion.
> 
>  drivers/media/v4l2-core/v4l2-ctrls.c |   7 ++
>  drivers/media/v4l2-core/v4l2-ioctl.c |   1 +
>  include/media/v4l2-ctrls.h           |   3 +
>  include/media/vp8-ctrls.h            | 104 +++++++++++++++++++++++++++
>  include/uapi/linux/videodev2.h       |   1 +
>  5 files changed, 116 insertions(+)
>  create mode 100644 include/media/vp8-ctrls.h
> 
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> index 366200d31bc0..c77a56c3e2aa 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -869,6 +869,7 @@ const char *v4l2_ctrl_get_name(u32 id)
>  	case V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP:		return "VPX P-Frame QP Value";
>  	case V4L2_CID_MPEG_VIDEO_VP8_PROFILE:			return "VP8 Profile";
>  	case V4L2_CID_MPEG_VIDEO_VP9_PROFILE:			return "VP9 Profile";
> +	case V4L2_CID_MPEG_VIDEO_VP8_FRAME_HDR:			return "VP8 Frame Header";
>  
>  	/* HEVC controls */
>  	case V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_QP:		return "HEVC I-Frame QP Value";
> @@ -1323,6 +1324,9 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
>  	case V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS:
>  		*type = V4L2_CTRL_TYPE_H264_DECODE_PARAMS;
>  		break;
> +	case V4L2_CID_MPEG_VIDEO_VP8_FRAME_HDR:
> +		*type = V4L2_CTRL_TYPE_VP8_FRAME_HDR;
> +		break;
>  	default:
>  		*type = V4L2_CTRL_TYPE_INTEGER;
>  		break;
> @@ -1694,6 +1698,7 @@ static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
>  	case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
>  	case V4L2_CTRL_TYPE_H264_SLICE_PARAMS:
>  	case V4L2_CTRL_TYPE_H264_DECODE_PARAMS:
> +	case V4L2_CTRL_TYPE_VP8_FRAME_HDR:
>  		return 0;
>  
>  	default:
> @@ -2290,6 +2295,8 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
>  		break;
>  	case V4L2_CTRL_TYPE_H264_DECODE_PARAMS:
>  		elem_size = sizeof(struct v4l2_ctrl_h264_decode_param);
> +	case V4L2_CTRL_TYPE_VP8_FRAME_HDR:
> +		elem_size = sizeof(struct v4l2_ctrl_vp8_frame_header);
>  		break;
>  	default:
>  		if (type < V4L2_CTRL_COMPOUND_TYPES)
> diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c b/drivers/media/v4l2-core/v4l2-ioctl.c
> index c765c7c7c562..ea295aa9d0b6 100644
> --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> @@ -1324,6 +1324,7 @@ static void v4l_fill_fmtdesc(struct v4l2_fmtdesc *fmt)
>  		case V4L2_PIX_FMT_VC1_ANNEX_G:	descr = "VC-1 (SMPTE 412M Annex G)"; break;
>  		case V4L2_PIX_FMT_VC1_ANNEX_L:	descr = "VC-1 (SMPTE 412M Annex L)"; break;
>  		case V4L2_PIX_FMT_VP8:		descr = "VP8"; break;
> +		case V4L2_PIX_FMT_VP8_FRAME:    descr = "VP8 FRAME"; break;
>  		case V4L2_PIX_FMT_VP9:		descr = "VP9"; break;
>  		case V4L2_PIX_FMT_HEVC:		descr = "HEVC"; break; /* aka H.265 */
>  		case V4L2_PIX_FMT_FWHT:		descr = "FWHT"; break; /* used in vicodec */
> diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
> index 22b6d09c4764..183c7fc5d18d 100644
> --- a/include/media/v4l2-ctrls.h
> +++ b/include/media/v4l2-ctrls.h
> @@ -28,6 +28,7 @@
>   */
>  #include <media/mpeg2-ctrls.h>
>  #include <media/h264-ctrls.h>
> +#include <media/vp8-ctrls.h>
>  
>  /* forward references */
>  struct file;
> @@ -55,6 +56,7 @@ struct poll_table_struct;
>   * @p_h264_scaling_matrix:	Pointer to a struct v4l2_ctrl_h264_scaling_matrix.
>   * @p_h264_slice_param:		Pointer to a struct v4l2_ctrl_h264_slice_param.
>   * @p_h264_decode_param:	Pointer to a struct v4l2_ctrl_h264_decode_param.
> + * @p_vp8_frame_header:		Pointer to a VP8 frame header structure.
>   * @p:				Pointer to a compound value.
>   */
>  union v4l2_ctrl_ptr {
> @@ -71,6 +73,7 @@ union v4l2_ctrl_ptr {
>  	struct v4l2_ctrl_h264_scaling_matrix *p_h264_scaling_matrix;
>  	struct v4l2_ctrl_h264_slice_param *p_h264_slice_param;
>  	struct v4l2_ctrl_h264_decode_param *p_h264_decode_param;
> +	struct v4l2_ctrl_vp8_frame_header *p_vp8_frame_header;
>  	void *p;
>  };
>  
> diff --git a/include/media/vp8-ctrls.h b/include/media/vp8-ctrls.h
> new file mode 100644
> index 000000000000..95b63a0cb239
> --- /dev/null
> +++ b/include/media/vp8-ctrls.h
> @@ -0,0 +1,104 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * TODO: Make sure structs have no holes and are 4-byte aligned.
> + */
> +
> +#ifndef _VP8_CTRLS_H_
> +#define _VP8_CTRLS_H_
> +
> +#include <linux/v4l2-controls.h>
> +
> +#define V4L2_CID_MPEG_VIDEO_VP8_FRAME_HDR (V4L2_CID_MPEG_BASE + 260)
> +
> +#define V4L2_CTRL_TYPE_VP8_FRAME_HDR		0x220
> +
> +#define V4L2_VP8_SEGMNT_HDR_FLAG_ENABLED              0x01
> +#define V4L2_VP8_SEGMNT_HDR_FLAG_UPDATE_MAP           0x02
> +#define V4L2_VP8_SEGMNT_HDR_FLAG_UPDATE_FEATURE_DATA  0x04
> +
> +struct v4l2_vp8_segment_header {
> +	__u8 segment_feature_mode;
> +	__s8 quant_update[4];
> +	__s8 lf_update[4];
> +	__u8 segment_probs[3];
> +	__u32 flags;
> +};
> +
> +#define V4L2_VP8_LF_HDR_ADJ_ENABLE	0x01
> +#define V4L2_VP8_LF_HDR_DELTA_UPDATE	0x02
> +struct v4l2_vp8_loopfilter_header {
> +	__u16 type;
> +	__u8 level;
> +	__u8 sharpness_level;
> +	__s8 ref_frm_delta_magnitude[4];
> +	__s8 mb_mode_delta_magnitude[4];
> +	__u16 flags;
> +};
> +
> +struct v4l2_vp8_quantization_header {
> +	__u8 y_ac_qi;
> +	__s8 y_dc_delta;
> +	__s8 y2_dc_delta;
> +	__s8 y2_ac_delta;
> +	__s8 uv_dc_delta;
> +	__s8 uv_ac_delta;
> +	__u16 dequant_factors[4][3][2];
> +};
> +
> +struct v4l2_vp8_entropy_header {
> +	__u8 coeff_probs[4][8][3][11];
> +	__u8 y_mode_probs[4];
> +	__u8 uv_mode_probs[3];
> +	__u8 mv_probs[2][19];
> +};
> +
> +#define V4L2_VP8_FRAME_HDR_FLAG_EXPERIMENTAL		0x01
> +#define V4L2_VP8_FRAME_HDR_FLAG_SHOW_FRAME		0x02
> +#define V4L2_VP8_FRAME_HDR_FLAG_MB_NO_SKIP_COEFF	0x04
> +struct v4l2_ctrl_vp8_frame_header {
> +	/* 0: keyframe, 1: not a keyframe */
> +	__u8 key_frame; // could be a flag?

Yes, I think it would be more consistent to make this a flag.

> +	__u8 version;
> +
> +	/* Populated also if not a key frame */
> +	__u16 width;
> +	__u16 height;
> +	__u8 horizontal_scale;
> +	__u8 vertical_scale;
> +
> +	struct v4l2_vp8_segment_header segment_header;
> +	struct v4l2_vp8_loopfilter_header lf_header;
> +	struct v4l2_vp8_quantization_header quant_header;
> +	struct v4l2_vp8_entropy_header entropy_header;
> +
> +	__u8 sign_bias_golden;
> +	__u8 sign_bias_alternate;
> +
> +	__u8 prob_skip_false;
> +	__u8 prob_intra;
> +	__u8 prob_last;
> +	__u8 prob_gf;
> +
> +	__u32 first_part_size;
> +	__u32 first_part_offset; // this needed? it's always 3 + 7 * s->keyframe;
> +	/*
> +	 * Offset in bits of MB data in first partition,
> +	 * i.e. bit offset starting from first_part_offset.
> +	 */
> +	__u32 macroblock_bit_offset;
> +
> +	__u8 num_dct_parts;
> +	__u32 dct_part_sizes[8];
> +
> +	__u8 bool_dec_range;
> +	__u8 bool_dec_value;
> +	__u8 bool_dec_count;

I don't know if we care about packing in general, but you have 3 bytes
in between a __u32 and a __u64.

> +
> +	__u64 last_frame_ts;
> +	__u64 golden_frame_ts;
> +	__u64 alt_frame_ts;
> +
> +	__u8 flags;
> +};
> +
> +#endif
> diff --git a/include/uapi/linux/videodev2.h b/include/uapi/linux/videodev2.h
> index f6a484017208..a906bfc0c8f0 100644
> --- a/include/uapi/linux/videodev2.h
> +++ b/include/uapi/linux/videodev2.h
> @@ -664,6 +664,7 @@ struct v4l2_pix_format {
>  #define V4L2_PIX_FMT_VC1_ANNEX_G v4l2_fourcc('V', 'C', '1', 'G') /* SMPTE 421M Annex G compliant stream */
>  #define V4L2_PIX_FMT_VC1_ANNEX_L v4l2_fourcc('V', 'C', '1', 'L') /* SMPTE 421M Annex L compliant stream */
>  #define V4L2_PIX_FMT_VP8      v4l2_fourcc('V', 'P', '8', '0') /* VP8 */
> +#define V4L2_PIX_FMT_VP8_FRAME v4l2_fourcc('V', 'P', '8', 'F') /* VP8 parsed frames */
>  #define V4L2_PIX_FMT_VP9      v4l2_fourcc('V', 'P', '9', '0') /* VP9 */
>  #define V4L2_PIX_FMT_HEVC     v4l2_fourcc('H', 'E', 'V', 'C') /* HEVC aka H.265 */
>  #define V4L2_PIX_FMT_FWHT     v4l2_fourcc('F', 'W', 'H', 'T') /* Fast Walsh Hadamard Transform (vicodec) */

[-- Attachment #2: This is a digitally signed message part --]
[-- Type: application/pgp-signature, Size: 195 bytes --]