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

From: Paul Kocialkowski
Date: Wed Sep 05 2018 - 11:43:44 EST

Hi Hans,

Le lundi 03 septembre 2018 Ã 10:32 +0200, Hans Verkuil a Ãcrit :
> 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@xxxxxxxxxxx>
> > ---
> > .../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 */
> >
>
>
--
Developer of free digital technology and hardware support.

Website: https://www.paulk.fr/
Coding blog: https://code.paulk.fr/
Git repositories: https://git.paulk.fr/ https://git.code.paulk.fr/

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