Re: [PATCH v8 1/8] media: v4l: Add definitions for MPEG2 slice format and metadata

[Paul Kocialkowski <contact@paulk.fr>]

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Hi Hans,

Le lundi 03 septembre 2018 à 10:32 +0200, Hans Verkuil a écrit :
> This looks very nice. I have two more comments, but they can be added
> using a follow-up patch (unless you need a v9 anyway):

I suppose I'll send a v9 to keep things in order here.

And thanks for the review!

> On 08/28/2018 09:34 AM, Paul Kocialkowski wrote:
> > Stateless video decoding engines require both the MPEG slices and
> > associated metadata from the video stream in order to decode
> > frames.
> > 
> > This introduces definitions for a new pixel format, describing
> > buffers
> > with MPEG2 slice data, as well as a control structure for passing
> > the
> > frame metadata to drivers.
> > 
> > This is based on work from both Florent Revest and Hugues Fruchet.
> > 
> > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > ---
> >  .../media/uapi/v4l/extended-controls.rst      | 177
> > ++++++++++++++++++
> >  .../media/uapi/v4l/pixfmt-compressed.rst      |  14 ++
> >  .../media/uapi/v4l/vidioc-queryctrl.rst       |  14 +-
> >  .../media/videodev2.h.rst.exceptions          |   2 +
> >  drivers/media/v4l2-core/v4l2-ctrls.c          |  63 +++++++
> >  drivers/media/v4l2-core/v4l2-ioctl.c          |   1 +
> >  include/media/v4l2-ctrls.h                    |  18 +-
> >  include/uapi/linux/v4l2-controls.h            |  65 +++++++
> >  include/uapi/linux/videodev2.h                |   5 +
> >  9 files changed, 350 insertions(+), 9 deletions(-)
> > 
> > diff --git a/Documentation/media/uapi/v4l/extended-controls.rst
> > b/Documentation/media/uapi/v4l/extended-controls.rst
> > index 9f7312bf3365..a9252225b63e 100644
> > --- a/Documentation/media/uapi/v4l/extended-controls.rst
> > +++ b/Documentation/media/uapi/v4l/extended-controls.rst
> > @@ -1497,6 +1497,183 @@ enum
> > v4l2_mpeg_video_h264_hierarchical_coding_type -
> >  
> >  
> >  
> > +.. _v4l2-mpeg-mpeg2:
> > +
> > +``V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS (struct)``
> > +    Specifies the slice parameters (as extracted from the
> > bitstream) for the
> > +    associated MPEG-2 slice data. This includes the necessary
> > parameters for
> > +    configuring a stateless hardware decoding pipeline for MPEG-2.
> > +    The bitstream parameters are defined according to the ISO/IEC
> > 13818-2 and
> > +    ITU-T Rec. H.262 specifications.
> 
> You need to use references to the specs in the biblio.rst file.
> ISO/IEC 13818-2
> is there already. As far as I can see ISO/IEC 13818-2 == ITU-T Rec.
> H.262, so
> it's only one spec, not two.

Alright, I had missed that. Will do!

> > +
> > +.. c:type:: v4l2_ctrl_mpeg2_slice_params
> > +
> > +.. cssclass:: longtable
> > +
> > +.. flat-table:: struct v4l2_ctrl_mpeg2_slice_params
> > +    :header-rows:  0
> > +    :stub-columns: 0
> > +    :widths:       1 1 2
> > +
> > +    * - __u32
> > +      - ``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.
> > +    * - struct :c:type:`v4l2_mpeg2_sequence`
> > +      - ``sequence``
> > +      - Structure with MPEG-2 sequence metadata, merging relevant
> > fields from
> > +	the sequence header and sequence extension parts of the
> > bitstream.
> > +    * - struct :c:type:`v4l2_mpeg2_picture`
> > +      - ``picture``
> > +      - Structure with MPEG-2 picture metadata, merging relevant
> > fields from
> > +	the picture header and picture coding extension parts of the
> > bitstream.
> > +    * - __u8
> > +      - ``quantiser_scale_code``
> > +      - Code used to determine the quantization scale to use for
> > the IDCT.
> > +    * - __u8
> > +      - ``backward_ref_index``
> > +      - Index for the V4L2 buffer to use as backward reference,
> > used with
> > +	B-coded and P-coded frames.
> > +    * - __u8
> > +      - ``forward_ref_index``
> > +      - Index for the V4L2 buffer to use as forward reference,
> > used with
> > +	P-coded frames.
> > +
> > +.. c:type:: v4l2_mpeg2_sequence
> > +
> > +.. cssclass:: longtable
> > +
> > +.. flat-table:: struct v4l2_mpeg2_sequence
> > +    :header-rows:  0
> > +    :stub-columns: 0
> > +    :widths:       1 1 2
> > +
> > +    * - __u16
> > +      - ``horizontal_size``
> > +      - The width of the displayable part of the frame's luminance
> > component.
> > +    * - __u16
> > +      - ``vertical_size``
> > +      - The height of the displayable part of the frame's
> > luminance component.
> > +    * - __u32
> > +      - ``vbv_buffer_size``
> > +      - Used to calculate the required size of the video buffering
> > verifier,
> > +	defined (in bits) as: 16 * 1024 * vbv_buffer_size.
> > +    * - __u8
> > +      - ``profile_and_level_indication``
> > +      - The current profile and level indication as extracted from
> > the
> > +	bitstream.
> > +    * - __u8
> > +      - ``progressive_sequence``
> > +      - Indication that all the frames for the sequence are
> > progressive instead
> > +	of interlaced.
> > +    * - __u8
> > +      - ``chroma_format``
> > +      - The chrominance sub-sampling format (1: 4:2:0, 2: 4:2:2,
> > 3: 4:4:4).
> > +
> > +.. c:type:: v4l2_mpeg2_picture
> > +
> > +.. cssclass:: longtable
> > +
> > +.. flat-table:: struct v4l2_mpeg2_picture
> > +    :header-rows:  0
> > +    :stub-columns: 0
> > +    :widths:       1 1 2
> > +
> > +    * - __u8
> > +      - ``picture_coding_type``
> > +      - Picture coding type for the frame covered by the current
> > slice
> > +	(V4L2_MPEG2_PICTURE_CODING_TYPE_I,
> > V4L2_MPEG2_PICTURE_CODING_TYPE_P or
> > +	V4L2_MPEG2_PICTURE_CODING_TYPE_B).
> > +    * - __u8
> > +      - ``f_code[2][2]``
> > +      - Motion vector codes.
> > +    * - __u8
> > +      - ``intra_dc_precision``
> > +      - Precision of Discrete Cosine transform (0: 8 bits
> > precision,
> > +	1: 9 bits precision, 2: 10 bits precision, 3: 11 bits
> > precision).
> > +    * - __u8
> > +      - ``picture_structure``
> > +      - Picture structure (1: interlaced top field, 2: interlaced
> > bottom field,
> > +	3: progressive frame).
> > +    * - __u8
> > +      - ``top_field_first``
> > +      - If set to 1 and interlaced stream, top field is output
> > first.
> > +    * - __u8
> > +      - ``frame_pred_frame_dct``
> > +      - If set to 1, only frame-DCT and frame prediction are used.
> > +    * - __u8
> > +      - ``concealment_motion_vectors``
> > +      -  If set to 1, motion vectors are coded for intra
> > macroblocks.
> > +    * - __u8
> > +      - ``q_scale_type``
> > +      - This flag affects the inverse quantization process.
> > +    * - __u8
> > +      - ``intra_vlc_format``
> > +      - This flag affects the decoding of transform coefficient
> > data.
> > +    * - __u8
> > +      - ``alternate_scan``
> > +      - This flag affects the decoding of transform coefficient
> > data.
> > +    * - __u8
> > +      - ``repeat_first_field``
> > +      - This flag affects the decoding process of progressive
> > frames.
> > +    * - __u8
> > +      - ``progressive_frame``
> > +      - Indicates whether the current frame is progressive.
> > +
> > +``V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION (struct)``
> > +    Specifies quantization matrices (as extracted from the
> > bitstream) for the
> > +    associated MPEG-2 slice data.
> > +
> > +.. c:type:: v4l2_ctrl_mpeg2_quantization
> > +
> > +.. cssclass:: longtable
> > +
> > +.. flat-table:: struct v4l2_ctrl_mpeg2_quantization
> > +    :header-rows:  0
> > +    :stub-columns: 0
> > +    :widths:       1 1 2
> > +
> > +    * - __u8
> > +      - ``load_intra_quantiser_matrix``
> > +      - One bit to indicate whether to load the
> > ``intra_quantiser_matrix`` data.
> > +    * - __u8
> > +      - ``load_non_intra_quantiser_matrix``
> > +      - One bit to indicate whether to load the
> > ``non_intra_quantiser_matrix``
> > +	data.
> > +    * - __u8
> > +      - ``load_chroma_intra_quantiser_matrix``
> > +      - One bit to indicate whether to load the
> > +	``chroma_intra_quantiser_matrix`` data, only relevant for non-
> > 4:2:0 YUV
> > +	formats.
> > +    * - __u8
> > +      - ``load_chroma_non_intra_quantiser_matrix``
> > +      - One bit to indicate whether to load the
> > +	``chroma_non_intra_quantiser_matrix`` data, only relevant for
> > non-4:2:0
> > +	YUV formats.
> > +    * - __u8
> > +      - ``intra_quantiser_matrix[64]``
> > +      - The quantization matrix coefficients for intra-coded
> > frames, in zigzag
> > +	scanning order. It is relevant for both luma and chroma
> > components,
> > +	although it can be superseded by the chroma-specific matrix for
> > +	non-4:2:0 YUV formats.
> > +    * - __u8
> > +      - ``non_intra_quantiser_matrix[64]``
> > +      - The quantization matrix coefficients for non-intra-coded
> > frames, in
> > +	zigzag scanning order. It is relevant for both luma and chroma
> > +	components, although it can be superseded by the chroma-
> > specific matrix
> > +	for non-4:2:0 YUV formats.
> > +    * - __u8
> > +      - ``chroma_intra_quantiser_matrix[64]``
> > +      - The quantization matrix coefficients for the chominance
> > component of
> > +	intra-coded frames, in zigzag scanning order. Only relevant for
> > +	non-4:2:0 YUV formats.
> > +    * - __u8
> > +      - ``chroma_non_intra_quantiser_matrix[64]``
> > +      - The quantization matrix coefficients for the chrominance
> > component of
> > +	non-intra-coded frames, in zigzag scanning order. Only relevant
> > for
> > +	non-4:2:0 YUV formats.
> >  
> >  MFC 5.1 MPEG Controls
> >  ---------------------
> > diff --git a/Documentation/media/uapi/v4l/pixfmt-compressed.rst
> > b/Documentation/media/uapi/v4l/pixfmt-compressed.rst
> > index d382e7a5c38e..a86b59f770dd 100644
> > --- a/Documentation/media/uapi/v4l/pixfmt-compressed.rst
> > +++ b/Documentation/media/uapi/v4l/pixfmt-compressed.rst
> > @@ -60,6 +60,20 @@ Compressed Formats
> >        - ``V4L2_PIX_FMT_MPEG2``
> >        - 'MPG2'
> >        - MPEG2 video elementary stream.
> > +    * .. _V4L2-PIX-FMT-MPEG2-SLICE:
> > +
> > +      - ``V4L2_PIX_FMT_MPEG2_SLICE``
> > +      - 'MG2S'
> > +      - MPEG-2 parsed slice data, as extracted from the MPEG-2
> > bitstream.
> > +	This format is adapted for stateless video decoders that
> > implement a
> > +	MPEG-2 pipeline (using the Memory to Memory and Media Request
> > APIs).
> 
> Use references to the corresponding sections in the spec so the
> reader can just
> click on the link.

Sure thing!

Cheers,

Paul

> Regards,
> 
> 	Hans
> 
> > +	Metadata associated with the frame to decode is required to be
> > passed
> > +	through the ``V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS`` control
> > and
> > +	quantization matrices can optionally be specified through the
> > +	``V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION`` control.
> > +	See the :ref:`associated Codec Control IDs <v4l2-mpeg-mpeg2>`.
> > +	Buffers associated with this pixel format must contain the
> > appropriate
> > +	number of macroblocks to decode a full corresponding frame.
> >      * .. _V4L2-PIX-FMT-MPEG4:
> >  
> >        - ``V4L2_PIX_FMT_MPEG4``
> > diff --git a/Documentation/media/uapi/v4l/vidioc-queryctrl.rst
> > b/Documentation/media/uapi/v4l/vidioc-queryctrl.rst
> > index 5bd26e8c9a1a..258f5813f281 100644
> > --- a/Documentation/media/uapi/v4l/vidioc-queryctrl.rst
> > +++ b/Documentation/media/uapi/v4l/vidioc-queryctrl.rst
> > @@ -424,8 +424,18 @@ See also the examples in :ref:`control`.
> >        - any
> >        - An unsigned 32-bit valued control ranging from minimum to
> > maximum
> >  	inclusive. The step value indicates the increment between
> > values.
> > -
> > -
> > +    * - ``V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS``
> > +      - n/a
> > +      - n/a
> > +      - n/a
> > +      - A struct :c:type:`v4l2_ctrl_mpeg2_slice_params`,
> > containing MPEG-2
> > +	slice parameters for stateless video decoders.
> > +    * - ``V4L2_CTRL_TYPE_MPEG2_QUANTIZATION``
> > +      - n/a
> > +      - n/a
> > +      - n/a
> > +      - A struct :c:type:`v4l2_ctrl_mpeg2_quantization`,
> > containing MPEG-2
> > +	quantization matrices for stateless video decoders.
> >  
> >  .. tabularcolumns:: |p{6.6cm}|p{2.2cm}|p{8.7cm}|
> >  
> > diff --git a/Documentation/media/videodev2.h.rst.exceptions
> > b/Documentation/media/videodev2.h.rst.exceptions
> > index 99256a2c003e..30ba0d6f546f 100644
> > --- a/Documentation/media/videodev2.h.rst.exceptions
> > +++ b/Documentation/media/videodev2.h.rst.exceptions
> > @@ -129,6 +129,8 @@ replace symbol V4L2_CTRL_TYPE_STRING
> > :c:type:`v4l2_ctrl_type`
> >  replace symbol V4L2_CTRL_TYPE_U16 :c:type:`v4l2_ctrl_type`
> >  replace symbol V4L2_CTRL_TYPE_U32 :c:type:`v4l2_ctrl_type`
> >  replace symbol V4L2_CTRL_TYPE_U8 :c:type:`v4l2_ctrl_type`
> > +replace symbol V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS
> > :c:type:`v4l2_ctrl_type`
> > +replace symbol V4L2_CTRL_TYPE_MPEG2_QUANTIZATION
> > :c:type:`v4l2_ctrl_type`
> >  
> >  # V4L2 capability defines
> >  replace define V4L2_CAP_VIDEO_CAPTURE device-capabilities
> > diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c
> > b/drivers/media/v4l2-core/v4l2-ctrls.c
> > index ccaf3068de6d..bcf520e0f61c 100644
> > --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> > +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> > @@ -844,6 +844,8 @@ const char *v4l2_ctrl_get_name(u32 id)
> >  	case V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE:		return
> > "Vertical MV Search Range";
> >  	case V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER:		return
> > "Repeat Sequence Header";
> >  	case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:		return
> > "Force Key Frame";
> > +	case V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS:		ret
> > urn "MPEG-2 Slice Parameters";
> > +	case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION:		ret
> > urn "MPEG-2 Quantization Matrices";
> >  
> >  	/* VPX controls */
> >  	case V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS:		ret
> > urn "VPX Number of Partitions";
> > @@ -1292,6 +1294,12 @@ void v4l2_ctrl_fill(u32 id, const char
> > **name, enum v4l2_ctrl_type *type,
> >  	case V4L2_CID_RDS_TX_ALT_FREQS:
> >  		*type = V4L2_CTRL_TYPE_U32;
> >  		break;
> > +	case V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS:
> > +		*type = V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS;
> > +		break;
> > +	case V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION:
> > +		*type = V4L2_CTRL_TYPE_MPEG2_QUANTIZATION;
> > +		break;
> >  	default:
> >  		*type = V4L2_CTRL_TYPE_INTEGER;
> >  		break;
> > @@ -1550,6 +1558,7 @@ static void std_log(const struct v4l2_ctrl
> > *ctrl)
> >  static int std_validate(const struct v4l2_ctrl *ctrl, u32 idx,
> >  			union v4l2_ctrl_ptr ptr)
> >  {
> > +	struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
> >  	size_t len;
> >  	u64 offset;
> >  	s64 val;
> > @@ -1612,6 +1621,54 @@ static int std_validate(const struct
> > v4l2_ctrl *ctrl, u32 idx,
> >  			return -ERANGE;
> >  		return 0;
> >  
> > +	case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
> > +		p_mpeg2_slice_params = ptr.p;
> > +
> > +		switch (p_mpeg2_slice_params->sequence.chroma_format) {
> > +		case 1: /* 4:2:0 */
> > +		case 2: /* 4:2:2 */
> > +		case 3: /* 4:4:4 */
> > +			break;
> > +		default:
> > +			return -EINVAL;
> > +		}
> > +
> > +		switch (p_mpeg2_slice_params-
> > >picture.intra_dc_precision) {
> > +		case 0: /* 8 bits */
> > +		case 1: /* 9 bits */
> > +		case 11: /* 11 bits */
> > +			break;
> > +		default:
> > +			return -EINVAL;
> > +		}
> > +
> > +		switch (p_mpeg2_slice_params-
> > >picture.picture_structure) {
> > +		case 1: /* interlaced top field */
> > +		case 2: /* interlaced bottom field */
> > +		case 3: /* progressive */
> > +			break;
> > +		default:
> > +			return -EINVAL;
> > +		}
> > +
> > +		switch (p_mpeg2_slice_params-
> > >picture.picture_coding_type) {
> > +		case V4L2_MPEG2_PICTURE_CODING_TYPE_I:
> > +		case V4L2_MPEG2_PICTURE_CODING_TYPE_P:
> > +		case V4L2_MPEG2_PICTURE_CODING_TYPE_B:
> > +			break;
> > +		default:
> > +			return -EINVAL;
> > +		}
> > +
> > +		if (p_mpeg2_slice_params->backward_ref_index >=
> > VIDEO_MAX_FRAME ||
> > +		    p_mpeg2_slice_params->forward_ref_index >=
> > VIDEO_MAX_FRAME)
> > +			return -EINVAL;
> > +
> > +		return 0;
> > +
> > +	case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
> > +		return 0;
> > +
> >  	default:
> >  		return -EINVAL;
> >  	}
> > @@ -2186,6 +2243,12 @@ static struct v4l2_ctrl
> > *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
> >  	case V4L2_CTRL_TYPE_U32:
> >  		elem_size = sizeof(u32);
> >  		break;
> > +	case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
> > +		elem_size = sizeof(struct
> > v4l2_ctrl_mpeg2_slice_params);
> > +		break;
> > +	case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
> > +		elem_size = sizeof(struct
> > v4l2_ctrl_mpeg2_quantization);
> > +		break;
> >  	default:
> >  		if (type < V4L2_CTRL_COMPOUND_TYPES)
> >  			elem_size = sizeof(s32);
> > diff --git a/drivers/media/v4l2-core/v4l2-ioctl.c
> > b/drivers/media/v4l2-core/v4l2-ioctl.c
> > index 87dba0b9c0a7..1a8feaf6c3f7 100644
> > --- a/drivers/media/v4l2-core/v4l2-ioctl.c
> > +++ b/drivers/media/v4l2-core/v4l2-ioctl.c
> > @@ -1309,6 +1309,7 @@ static void v4l_fill_fmtdesc(struct
> > v4l2_fmtdesc *fmt)
> >  		case V4L2_PIX_FMT_H263:		descr = "H.263";
> > break;
> >  		case V4L2_PIX_FMT_MPEG1:	descr = "MPEG-1 ES"; break;
> >  		case V4L2_PIX_FMT_MPEG2:	descr = "MPEG-2 ES"; break;
> > +		case V4L2_PIX_FMT_MPEG2_SLICE:	descr = "MPEG-2
> > Parsed Slice Data"; break;
> >  		case V4L2_PIX_FMT_MPEG4:	descr = "MPEG-4 part 2 ES";
> > break;
> >  		case V4L2_PIX_FMT_XVID:		descr = "Xvid";
> > break;
> >  		case V4L2_PIX_FMT_VC1_ANNEX_G:	descr = "VC-1
> > (SMPTE 412M Annex G)"; break;
> > diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-
> > ctrls.h
> > index 53ca4df0c353..0dae03dd5b06 100644
> > --- a/include/media/v4l2-ctrls.h
> > +++ b/include/media/v4l2-ctrls.h
> > @@ -35,13 +35,15 @@ struct poll_table_struct;
> >  
> >  /**
> >   * union v4l2_ctrl_ptr - A pointer to a control value.
> > - * @p_s32:	Pointer to a 32-bit signed value.
> > - * @p_s64:	Pointer to a 64-bit signed value.
> > - * @p_u8:	Pointer to a 8-bit unsigned value.
> > - * @p_u16:	Pointer to a 16-bit unsigned value.
> > - * @p_u32:	Pointer to a 32-bit unsigned value.
> > - * @p_char:	Pointer to a string.
> > - * @p:		Pointer to a compound value.
> > + * @p_s32:			Pointer to a 32-bit signed value.
> > + * @p_s64:			Pointer to a 64-bit signed value.
> > + * @p_u8:			Pointer to a 8-bit unsigned value.
> > + * @p_u16:			Pointer to a 16-bit unsigned value.
> > + * @p_u32:			Pointer to a 32-bit unsigned value.
> > + * @p_char:			Pointer to a string.
> > + * @p_mpeg2_slice_params:	Pointer to a MPEG2 slice parameters
> > structure.
> > + * @p_mpeg2_quantization:	Pointer to a MPEG2 quantization data
> > structure.
> > + * @p:				Pointer to a compound value.
> >   */
> >  union v4l2_ctrl_ptr {
> >  	s32 *p_s32;
> > @@ -50,6 +52,8 @@ union v4l2_ctrl_ptr {
> >  	u16 *p_u16;
> >  	u32 *p_u32;
> >  	char *p_char;
> > +	struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
> > +	struct v4l2_ctrl_mpeg2_quantization *p_mpeg2_quantization;
> >  	void *p;
> >  };
> >  
> > diff --git a/include/uapi/linux/v4l2-controls.h
> > b/include/uapi/linux/v4l2-controls.h
> > index e4ee10ee917d..51b095898f4b 100644
> > --- a/include/uapi/linux/v4l2-controls.h
> > +++ b/include/uapi/linux/v4l2-controls.h
> > @@ -402,6 +402,9 @@ enum v4l2_mpeg_video_multi_slice_mode {
> >  #define V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE		(V4L2_C
> > ID_MPEG_BASE+228)
> >  #define V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME		(V4L2_C
> > ID_MPEG_BASE+229)
> >  
> > +#define V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS		(V4L2_C
> > ID_MPEG_BASE+250)
> > +#define V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION		(V4L2_C
> > ID_MPEG_BASE+251)
> > +
> >  #define V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP		(V4L2_C
> > ID_MPEG_BASE+300)
> >  #define V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP		(V4L2_C
> > ID_MPEG_BASE+301)
> >  #define V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP		(V4L2_C
> > ID_MPEG_BASE+302)
> > @@ -1092,4 +1095,66 @@ enum v4l2_detect_md_mode {
> >  #define V4L2_CID_DETECT_MD_THRESHOLD_GRID	(V4L2_CID_DETECT_CLASS_
> > BASE + 3)
> >  #define V4L2_CID_DETECT_MD_REGION_GRID		(V4L2_CID_DETEC
> > T_CLASS_BASE + 4)
> >  
> > +#define V4L2_MPEG2_PICTURE_CODING_TYPE_I	1
> > +#define V4L2_MPEG2_PICTURE_CODING_TYPE_P	2
> > +#define V4L2_MPEG2_PICTURE_CODING_TYPE_B	3
> > +#define V4L2_MPEG2_PICTURE_CODING_TYPE_D	4
> > +
> > +struct v4l2_mpeg2_sequence {
> > +	/* ISO/IEC 13818-2, ITU-T Rec. H.262: Sequence header */
> > +	__u16	horizontal_size;
> > +	__u16	vertical_size;
> > +	__u32	vbv_buffer_size;
> > +
> > +	/* ISO/IEC 13818-2, ITU-T Rec. H.262: Sequence extension */
> > +	__u8	profile_and_level_indication;
> > +	__u8	progressive_sequence;
> > +	__u8	chroma_format;
> > +};
> > +
> > +struct v4l2_mpeg2_picture {
> > +	/* ISO/IEC 13818-2, ITU-T Rec. H.262: Picture header */
> > +	__u8	picture_coding_type;
> > +
> > +	/* ISO/IEC 13818-2, ITU-T Rec. H.262: Picture coding extension
> > */
> > +	__u8	f_code[2][2];
> > +	__u8	intra_dc_precision;
> > +	__u8	picture_structure;
> > +	__u8	top_field_first;
> > +	__u8	frame_pred_frame_dct;
> > +	__u8	concealment_motion_vectors;
> > +	__u8	q_scale_type;
> > +	__u8	intra_vlc_format;
> > +	__u8	alternate_scan;
> > +	__u8	repeat_first_field;
> > +	__u8	progressive_frame;
> > +};
> > +
> > +struct v4l2_ctrl_mpeg2_slice_params {
> > +	__u32	bit_size;
> > +	__u32	data_bit_offset;
> > +
> > +	struct v4l2_mpeg2_sequence sequence;
> > +	struct v4l2_mpeg2_picture picture;
> > +
> > +	/* ISO/IEC 13818-2, ITU-T Rec. H.262: Slice */
> > +	__u8	quantiser_scale_code;
> > +
> > +	__u8	backward_ref_index;
> > +	__u8	forward_ref_index;
> > +};
> > +
> > +struct v4l2_ctrl_mpeg2_quantization {
> > +	/* ISO/IEC 13818-2, ITU-T Rec. H.262: Quant matrix extension */
> > +	__u8	load_intra_quantiser_matrix;
> > +	__u8	load_non_intra_quantiser_matrix;
> > +	__u8	load_chroma_intra_quantiser_matrix;
> > +	__u8	load_chroma_non_intra_quantiser_matrix;
> > +
> > +	__u8	intra_quantiser_matrix[64];
> > +	__u8	non_intra_quantiser_matrix[64];
> > +	__u8	chroma_intra_quantiser_matrix[64];
> > +	__u8	chroma_non_intra_quantiser_matrix[64];
> > +};
> > +
> >  #endif
> > diff --git a/include/uapi/linux/videodev2.h
> > b/include/uapi/linux/videodev2.h
> > index 490fc9964d97..ad7064fcccea 100644
> > --- a/include/uapi/linux/videodev2.h
> > +++ b/include/uapi/linux/videodev2.h
> > @@ -635,6 +635,7 @@ struct v4l2_pix_format {
> >  #define V4L2_PIX_FMT_H263     v4l2_fourcc('H', '2', '6', '3') /*
> > H263          */
> >  #define V4L2_PIX_FMT_MPEG1    v4l2_fourcc('M', 'P', 'G', '1') /*
> > MPEG-1 ES     */
> >  #define V4L2_PIX_FMT_MPEG2    v4l2_fourcc('M', 'P', 'G', '2') /*
> > MPEG-2 ES     */
> > +#define V4L2_PIX_FMT_MPEG2_SLICE v4l2_fourcc('M', 'G', '2', 'S')
> > /* MPEG-2 parsed slice data */
> >  #define V4L2_PIX_FMT_MPEG4    v4l2_fourcc('M', 'P', 'G', '4') /*
> > MPEG-4 part 2 ES */
> >  #define V4L2_PIX_FMT_XVID     v4l2_fourcc('X', 'V', 'I', 'D') /*
> > Xvid           */
> >  #define V4L2_PIX_FMT_VC1_ANNEX_G v4l2_fourcc('V', 'C', '1', 'G')
> > /* SMPTE 421M Annex G compliant stream */
> > @@ -1601,6 +1602,8 @@ struct v4l2_ext_control {
> >  		__u8 __user *p_u8;
> >  		__u16 __user *p_u16;
> >  		__u32 __user *p_u32;
> > +		struct v4l2_ctrl_mpeg2_slice_params __user
> > *p_mpeg2_slice_params;
> > +		struct v4l2_ctrl_mpeg2_quantization __user
> > *p_mpeg2_quantization;
> >  		void __user *ptr;
> >  	};
> >  } __attribute__ ((packed));
> > @@ -1646,6 +1649,8 @@ enum v4l2_ctrl_type {
> >  	V4L2_CTRL_TYPE_U8	     = 0x0100,
> >  	V4L2_CTRL_TYPE_U16	     = 0x0101,
> >  	V4L2_CTRL_TYPE_U32	     = 0x0102,
> > +	V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS = 0x0103,
> > +	V4L2_CTRL_TYPE_MPEG2_QUANTIZATION = 0x0104,
> >  };
> >  
> >  /*  Used in the VIDIOC_QUERYCTRL ioctl for querying controls */
> > 
> 
> 
-- 
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Website: https://www.paulk.fr/
Coding blog: https://code.paulk.fr/
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