Re: [PATCH v2 3/3] media: uapi: mpeg2: Split sequence and picture parameters

From: Ezequiel Garcia
Date: Mon Nov 30 2020 - 14:13:17 EST

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In reply to: Jonas Karlman: "Re: [PATCH v2 3/3] media: uapi: mpeg2: Split sequence and picture parameters"
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On Sun, 2020-11-29 at 22:59 +0000, Jonas Karlman wrote:
> Hi Ezequiel,
>
> On 2020-11-05 21:51, Ezequiel Garcia wrote:
> > Typically, bitstreams are composed of one sequence header NAL unit,
> > followed by a number of picture header and picture coding extension
> > NAL units. Each picture can be composed by a number of slices.
> >
> > Let's split the MPEG-2 uAPI to follow these semantics more closely,
> > allowing more usage flexibility. Having these controls splitted
> > allows applications to set a sequence control at the beginning
> > of a sequence, and then set a picture control for each frame.
> >
> > While here add padding fields where needed, and document
> > the uAPI header thoroughly.
> >
> > Signed-off-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx>
> > ---
> > .../media/v4l/ext-ctrls-codec.rst | 47 ++++++--
> > .../media/v4l/pixfmt-compressed.rst | 5 +-
> > drivers/media/v4l2-core/v4l2-ctrls.c | 45 +++++--
> > drivers/staging/media/hantro/hantro_drv.c | 10 ++
> > .../media/hantro/hantro_g1_mpeg2_dec.c | 14 ++-
> > .../media/hantro/rk3399_vpu_hw_mpeg2_dec.c | 14 ++-
> > drivers/staging/media/sunxi/cedrus/cedrus.c | 14 +++
> > drivers/staging/media/sunxi/cedrus/cedrus.h | 2 +
> > .../staging/media/sunxi/cedrus/cedrus_mpeg2.c | 8 +-
> > include/media/mpeg2-ctrls.h | 110 +++++++++++++++---
> > include/media/v4l2-ctrls.h | 4 +
> > 11 files changed, 212 insertions(+), 61 deletions(-)
> >
> > diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> > index 4c32b93f41a6..d919cbc119bd 100644
> > --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> > +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> > @@ -2218,14 +2218,6 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type -
> > :stub-columns: 0
> > :widths: 1 1 2
> >
> > - * - 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.
> > * - __u64
> > - ``backward_ref_ts``
> > - Timestamp of the V4L2 capture buffer to use as backward reference, used
> > @@ -2243,14 +2235,28 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type -
> > * - __u32
> > - ``quantiser_scale_code``
> > - Code used to determine the quantization scale to use for the IDCT.
> > + * - __u8
> > + - ``reserved``
> > + - Applications and drivers must set this to zero.
> >
> > -.. c:type:: v4l2_mpeg2_sequence
> > +``V4L2_CID_MPEG_VIDEO_MPEG2_SEQUENCE (struct)``
> > + Specifies the sequence parameters (as extracted from the bitstream) for the
> > + associated MPEG-2 slice data. This includes fields matching the syntax
> > + elements from the sequence header and sequence extension parts of the
> > + bitstream as specified by :ref:`mpeg2part2`.
> > +
> > + .. note::
> > +
> > + This compound control is not yet part of the public kernel API and
> > + it is expected to change.
> > +
> > +.. c:type:: v4l2_ctrl_mpeg2_sequence
> >
> > .. cssclass:: longtable
> >
> > .. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
> >
> > -.. flat-table:: struct v4l2_mpeg2_sequence
> > +.. flat-table:: struct v4l2_ctrl_mpeg2_sequence
> > :header-rows: 0
> > :stub-columns: 0
> > :widths: 1 1 2
> > @@ -2272,6 +2278,9 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type -
> > * - __u8
> > - ``chroma_format``
> > - The chrominance sub-sampling format (1: 4:2:0, 2: 4:2:2, 3: 4:4:4).
> > + * - __u8
> > + - ``reserved``
> > + - Applications and drivers must set this to zero.
> > * - __u32
> > - ``flags``
> > - See :ref:`MPEG-2 Sequence Flags <mpeg2_sequence_flags>`.
> > @@ -2292,13 +2301,24 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type -
> > - Indication that all the frames for the sequence are progressive instead
> > of interlaced.
> >
> > -.. c:type:: v4l2_mpeg2_picture
> > +``V4L2_CID_MPEG_VIDEO_MPEG2_PICTURE (struct)``
> > + Specifies the picture parameters (as extracted from the bitstream) for the
> > + associated MPEG-2 slice data. This includes fields matching the syntax
> > + elements from the picture header and picture coding extension parts of the
> > + bitstream as specified by :ref:`mpeg2part2`.
> > +
> > + .. note::
> > +
> > + This compound control is not yet part of the public kernel API and
> > + it is expected to change.
> > +
> > +.. c:type:: v4l2_ctrl_mpeg2_picture
> >
> > .. cssclass:: longtable
> >
> > .. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
> >
> > -.. flat-table:: struct v4l2_mpeg2_picture
> > +.. flat-table:: struct v4l2_ctrl_mpeg2_picture
> > :header-rows: 0
> > :stub-columns: 0
> > :widths: 1 1 2
> > @@ -2319,6 +2339,9 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type -
> > - ``picture_structure``
> > - Picture structure (1: interlaced top field, 2: interlaced bottom field,
> > 3: progressive frame).
> > + * - __u8
> > + - ``reserved``
> > + - Applications and drivers must set this to zero.
> > * - __u32
> > - ``flags``
> > - See :ref:`MPEG-2 Picture Flags <mpeg2_picture_flags>`.
> > diff --git a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
> > index d585909bc4e2..1da4722bc8f3 100644
> > --- a/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
> > +++ b/Documentation/userspace-api/media/v4l/pixfmt-compressed.rst
> > @@ -113,8 +113,9 @@ Compressed Formats
> > This format is adapted for stateless video decoders that implement a
> > MPEG-2 pipeline (using the :ref:`mem2mem` and :ref:`media-request-api`).
> > 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
> > + through the ``V4L2_CID_MPEG_VIDEO_MPEG2_SEQUENCE``,
> > + ``V4L2_CID_MPEG_VIDEO_MPEG2_PICTURE``, and ``V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS``
> > + controls. 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>`.
> > Exactly one output and one capture buffer must be provided for use with
> > diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> > index c24caffc956d..da50fb9edb96 100644
> > --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> > +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> > @@ -1620,7 +1620,8 @@ static bool std_equal(const struct v4l2_ctrl *ctrl, u32 idx,
> > static void std_init_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> > union v4l2_ctrl_ptr ptr)
> > {
> > - struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
> > + struct v4l2_ctrl_mpeg2_sequence *p_mpeg2_sequence;
> > + struct v4l2_ctrl_mpeg2_picture *p_mpeg2_picture;
> > void *p = ptr.p + idx * ctrl->elem_size;
> >
> > if (ctrl->p_def.p_const)
> > @@ -1634,13 +1635,18 @@ static void std_init_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> > * v4l2_ctrl_type enum.
> > */
> > switch ((u32)ctrl->type) {
> > - case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
> > - p_mpeg2_slice_params = p;
> > + case V4L2_CTRL_TYPE_MPEG2_SEQUENCE:
> > + p_mpeg2_sequence = p;
> > +
> > /* 4:2:0 */
> > - p_mpeg2_slice_params->sequence.chroma_format = 1;
> > + p_mpeg2_sequence->chroma_format = 1;
> > + break;
> > + case V4L2_CTRL_TYPE_MPEG2_PICTURE:
> > + p_mpeg2_picture = p;
> > +
> > /* interlaced top field */
> > - p_mpeg2_slice_params->picture.picture_structure = 1;
> > - p_mpeg2_slice_params->picture.picture_coding_type =
> > + p_mpeg2_picture->picture_structure = 1;
> > + p_mpeg2_picture->picture_coding_type =
> > V4L2_MPEG2_PIC_CODING_TYPE_I;
> > break;
> > }
> > @@ -1768,6 +1774,8 @@ static void std_log(const struct v4l2_ctrl *ctrl)
> > static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> > union v4l2_ctrl_ptr ptr)
> > {
> > + struct v4l2_ctrl_mpeg2_sequence *p_mpeg2_sequence;
> > + struct v4l2_ctrl_mpeg2_picture *p_mpeg2_picture;
> > struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
> > struct v4l2_ctrl_vp8_frame_header *p_vp8_frame_header;
> > struct v4l2_ctrl_h264_slice_params *p_h264_slice_params;
> > @@ -1780,10 +1788,10 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> > unsigned int i;
> >
> > switch ((u32)ctrl->type) {
> > - case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
> > - p_mpeg2_slice_params = p;
> > + case V4L2_CTRL_TYPE_MPEG2_SEQUENCE:
> > + p_mpeg2_sequence = p;
> >
> > - switch (p_mpeg2_slice_params->sequence.chroma_format) {
> > + switch (p_mpeg2_sequence->chroma_format) {
> > case 1: /* 4:2:0 */
> > case 2: /* 4:2:2 */
> > case 3: /* 4:4:4 */
> > @@ -1791,8 +1799,14 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> > default:
> > return -EINVAL;
> > }
> > + zero_reserved(*p_mpeg2_sequence);
> > + break;
> > +
> > + case V4L2_CTRL_TYPE_MPEG2_PICTURE:
> > + p_mpeg2_picture = p;
> > + break;
> >
> > - switch (p_mpeg2_slice_params->picture.intra_dc_precision) {
> > + switch (p_mpeg2_picture->intra_dc_precision) {
> > case 0: /* 8 bits */
> > case 1: /* 9 bits */
> > case 2: /* 10 bits */
> > @@ -1801,8 +1815,9 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> > default:
> > return -EINVAL;
> > }
> > + break;
> >
> > - switch (p_mpeg2_slice_params->picture.picture_structure) {
> > + switch (p_mpeg2_picture->picture_structure) {
> > case V4L2_MPEG2_PIC_TOP_FIELD:
> > case V4L2_MPEG2_PIC_BOTTOM_FIELD:
> > case V4L2_MPEG2_PIC_FRAME:
> > @@ -1811,7 +1826,7 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> > return -EINVAL;
> > }
> >
> > - switch (p_mpeg2_slice_params->picture.picture_coding_type) {
> > + switch (p_mpeg2_picture->picture_coding_type) {
> > case V4L2_MPEG2_PIC_CODING_TYPE_I:
> > case V4L2_MPEG2_PIC_CODING_TYPE_P:
> > case V4L2_MPEG2_PIC_CODING_TYPE_B:
> > @@ -1819,7 +1834,13 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> > default:
> > return -EINVAL;
> > }
> > + zero_reserved(*p_mpeg2_picture);
> > + break;
> > +
> > + case V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS:
> > + p_mpeg2_slice_params = p;
> >
> > + zero_reserved(*p_mpeg2_slice_params);
> > break;
> >
> > case V4L2_CTRL_TYPE_MPEG2_QUANTIZATION:
> > diff --git a/drivers/staging/media/hantro/hantro_drv.c b/drivers/staging/media/hantro/hantro_drv.c
> > index 3cd00cc0a364..68543a8836e4 100644
> > --- a/drivers/staging/media/hantro/hantro_drv.c
> > +++ b/drivers/staging/media/hantro/hantro_drv.c
> > @@ -286,6 +286,16 @@ static const struct hantro_ctrl controls[] = {
> > .def = 50,
> > .ops = &hantro_jpeg_ctrl_ops,
> > },
> > + }, {
> > + .codec = HANTRO_MPEG2_DECODER,
> > + .cfg = {
> > + .id = V4L2_CID_MPEG_VIDEO_MPEG2_SEQUENCE,
> > + },
> > + }, {
> > + .codec = HANTRO_MPEG2_DECODER,
> > + .cfg = {
> > + .id = V4L2_CID_MPEG_VIDEO_MPEG2_PICTURE,
> > + },
> > }, {
> > .codec = HANTRO_MPEG2_DECODER,
> > .cfg = {
> > diff --git a/drivers/staging/media/hantro/hantro_g1_mpeg2_dec.c b/drivers/staging/media/hantro/hantro_g1_mpeg2_dec.c
> > index b6086474d31f..1a6ca49441f4 100644
> > --- a/drivers/staging/media/hantro/hantro_g1_mpeg2_dec.c
> > +++ b/drivers/staging/media/hantro/hantro_g1_mpeg2_dec.c
> > @@ -95,8 +95,8 @@ static void
> > hantro_g1_mpeg2_dec_set_buffers(struct hantro_dev *vpu, struct hantro_ctx *ctx,
> > struct vb2_buffer *src_buf,
> > struct vb2_buffer *dst_buf,
> > - const struct v4l2_mpeg2_sequence *seq,
> > - const struct v4l2_mpeg2_picture *pic,
> > + const struct v4l2_ctrl_mpeg2_sequence *seq,
> > + const struct v4l2_ctrl_mpeg2_picture *pic,
> > const struct v4l2_ctrl_mpeg2_slice_params *slice_params)
> > {
> > dma_addr_t forward_addr = 0, backward_addr = 0;
> > @@ -156,8 +156,8 @@ void hantro_g1_mpeg2_dec_run(struct hantro_ctx *ctx)
> > struct hantro_dev *vpu = ctx->dev;
> > struct vb2_v4l2_buffer *src_buf, *dst_buf;
> > const struct v4l2_ctrl_mpeg2_slice_params *slice_params;
> > - const struct v4l2_mpeg2_sequence *seq;
> > - const struct v4l2_mpeg2_picture *pic;
> > + const struct v4l2_ctrl_mpeg2_sequence *seq;
> > + const struct v4l2_ctrl_mpeg2_picture *pic;
> > u32 reg;
> >
> > src_buf = hantro_get_src_buf(ctx);
> > @@ -168,8 +168,10 @@ void hantro_g1_mpeg2_dec_run(struct hantro_ctx *ctx)
> >
> > slice_params = hantro_get_ctrl(ctx,
> > V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS);
> > - seq = &slice_params->sequence;
> > - pic = &slice_params->picture;
> > + seq = hantro_get_ctrl(ctx,
> > + V4L2_CID_MPEG_VIDEO_MPEG2_SEQUENCE);
> > + pic = hantro_get_ctrl(ctx,
> > + V4L2_CID_MPEG_VIDEO_MPEG2_PICTURE);
> >
> > reg = G1_REG_DEC_AXI_RD_ID(0) |
> > G1_REG_DEC_TIMEOUT_E(1) |
> > diff --git a/drivers/staging/media/hantro/rk3399_vpu_hw_mpeg2_dec.c b/drivers/staging/media/hantro/rk3399_vpu_hw_mpeg2_dec.c
> > index 28eb77b0569b..45ab5ca32221 100644
> > --- a/drivers/staging/media/hantro/rk3399_vpu_hw_mpeg2_dec.c
> > +++ b/drivers/staging/media/hantro/rk3399_vpu_hw_mpeg2_dec.c
> > @@ -97,8 +97,8 @@ rk3399_vpu_mpeg2_dec_set_buffers(struct hantro_dev *vpu,
> > struct hantro_ctx *ctx,
> > struct vb2_buffer *src_buf,
> > struct vb2_buffer *dst_buf,
> > - const struct v4l2_mpeg2_sequence *seq,
> > - const struct v4l2_mpeg2_picture *pic,
> > + const struct v4l2_ctrl_mpeg2_sequence *seq,
> > + const struct v4l2_ctrl_mpeg2_picture *pic,
> > const struct v4l2_ctrl_mpeg2_slice_params *slice_params)
> > {
> > dma_addr_t forward_addr = 0, backward_addr = 0;
> > @@ -158,8 +158,8 @@ void rk3399_vpu_mpeg2_dec_run(struct hantro_ctx *ctx)
> > struct hantro_dev *vpu = ctx->dev;
> > struct vb2_v4l2_buffer *src_buf, *dst_buf;
> > const struct v4l2_ctrl_mpeg2_slice_params *slice_params;
> > - const struct v4l2_mpeg2_sequence *seq;
> > - const struct v4l2_mpeg2_picture *pic;
> > + const struct v4l2_ctrl_mpeg2_sequence *seq;
> > + const struct v4l2_ctrl_mpeg2_picture *pic;
> > u32 reg;
> >
> > src_buf = hantro_get_src_buf(ctx);
> > @@ -169,8 +169,10 @@ void rk3399_vpu_mpeg2_dec_run(struct hantro_ctx *ctx)
> >
> > slice_params = hantro_get_ctrl(ctx,
> > V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS);
> > - seq = &slice_params->sequence;
> > - pic = &slice_params->picture;
> > + seq = hantro_get_ctrl(ctx,
> > + V4L2_CID_MPEG_VIDEO_MPEG2_SEQUENCE);
> > + pic = hantro_get_ctrl(ctx,
> > + V4L2_CID_MPEG_VIDEO_MPEG2_PICTURE);
> >
> > reg = VDPU_REG_DEC_ADV_PRE_DIS(0) |
> > VDPU_REG_DEC_SCMD_DIS(0) |
> > diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.c b/drivers/staging/media/sunxi/cedrus/cedrus.c
> > index 9a102b7c1bb9..5b464703cb27 100644
> > --- a/drivers/staging/media/sunxi/cedrus/cedrus.c
> > +++ b/drivers/staging/media/sunxi/cedrus/cedrus.c
> > @@ -29,6 +29,20 @@
> > #include "cedrus_hw.h"
> >
> > static const struct cedrus_control cedrus_controls[] = {
> > + {
> > + .cfg = {
> > + .id = V4L2_CID_MPEG_VIDEO_MPEG2_SEQUENCE,
> > + },
> > + .codec = CEDRUS_CODEC_MPEG2,
> > + .required = true,
> > + },
> > + {
> > + .cfg = {
> > + .id = V4L2_CID_MPEG_VIDEO_MPEG2_PICTURE,
> > + },
> > + .codec = CEDRUS_CODEC_MPEG2,
> > + .required = true,
> > + },
> > {
> > .cfg = {
> > .id = V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS,
> > diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.h b/drivers/staging/media/sunxi/cedrus/cedrus.h
> > index 93c843ae14bb..c27d9b159c26 100644
> > --- a/drivers/staging/media/sunxi/cedrus/cedrus.h
> > +++ b/drivers/staging/media/sunxi/cedrus/cedrus.h
> > @@ -66,6 +66,8 @@ struct cedrus_h264_run {
> > };
> >
> > struct cedrus_mpeg2_run {
> > + const struct v4l2_ctrl_mpeg2_sequence *sequence;
> > + const struct v4l2_ctrl_mpeg2_picture *picture;
> > const struct v4l2_ctrl_mpeg2_slice_params *slice_params;
> > const struct v4l2_ctrl_mpeg2_quantization *quantization;
> > };
> > diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_mpeg2.c b/drivers/staging/media/sunxi/cedrus/cedrus_mpeg2.c
> > index 6a99893cdc77..ea52778b36f9 100644
> > --- a/drivers/staging/media/sunxi/cedrus/cedrus_mpeg2.c
> > +++ b/drivers/staging/media/sunxi/cedrus/cedrus_mpeg2.c
> > @@ -75,8 +75,8 @@ static void cedrus_mpeg2_irq_disable(struct cedrus_ctx *ctx)
> > static void cedrus_mpeg2_setup(struct cedrus_ctx *ctx, struct cedrus_run *run)
> > {
> > const struct v4l2_ctrl_mpeg2_slice_params *slice_params;
> > - const struct v4l2_mpeg2_sequence *seq;
> > - const struct v4l2_mpeg2_picture *pic;
> > + const struct v4l2_ctrl_mpeg2_sequence *seq;
> > + const struct v4l2_ctrl_mpeg2_picture *pic;
> > const struct v4l2_ctrl_mpeg2_quantization *quantization;
> > dma_addr_t src_buf_addr, dst_luma_addr, dst_chroma_addr;
> > dma_addr_t fwd_luma_addr, fwd_chroma_addr;
> > @@ -90,8 +90,8 @@ static void cedrus_mpeg2_setup(struct cedrus_ctx *ctx, struct cedrus_run *run)
> > u32 reg;
> >
> > slice_params = run->mpeg2.slice_params;
> > - seq = &slice_params->sequence;
> > - pic = &slice_params->picture;
> > + seq = run->mpeg2.sequence;
> > + pic = run->mpeg2.picture;
> >
> > quantization = run->mpeg2.quantization;
> >
> > diff --git a/include/media/mpeg2-ctrls.h b/include/media/mpeg2-ctrls.h
> > index 5b0c916a44dd..cd8f0cea5665 100644
> > --- a/include/media/mpeg2-ctrls.h
> > +++ b/include/media/mpeg2-ctrls.h
> > @@ -12,24 +12,46 @@
> > #define _MPEG2_CTRLS_H_
> >
> > #define V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS (V4L2_CID_MPEG_BASE+250)
> > -#define V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION (V4L2_CID_MPEG_BASE+251)
> > +#define V4L2_CID_MPEG_VIDEO_MPEG2_SEQUENCE (V4L2_CID_MPEG_BASE+251)
> > +#define V4L2_CID_MPEG_VIDEO_MPEG2_PICTURE (V4L2_CID_MPEG_BASE+252)
> > +#define V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION (V4L2_CID_MPEG_BASE+253)
> >
> > /* enum v4l2_ctrl_type type values */
> > -#define V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS 0x0103
> > -#define V4L2_CTRL_TYPE_MPEG2_QUANTIZATION 0x0104
> > +#define V4L2_CTRL_TYPE_MPEG2_SLICE_PARAMS 0x0130
> > +#define V4L2_CTRL_TYPE_MPEG2_SEQUENCE 0x0131
> > +#define V4L2_CTRL_TYPE_MPEG2_PICTURE 0x0132
> > +#define V4L2_CTRL_TYPE_MPEG2_QUANTIZATION 0x0133
> >
> > #define V4L2_MPEG2_SEQ_FLAG_PROGRESSIVE 0x0001
> >
> > -struct v4l2_mpeg2_sequence {
> > - /* ISO/IEC 13818-2, ITU-T Rec. H.262: Sequence header */
> > +/**
> > + * struct v4l2_ctrl_mpeg2_sequence - MPEG-2 sequence header
> > + *
> > + * All the members on this structure match the sequence header and sequence
> > + * extension syntaxes as specified by the MPEG-2 specification.
> > + *
> > + * Fields horizontal_size, vertical_size and vbv_buffer_size are a
> > + * combination of respective _value and extension syntax elements,
> > + * as described in section 6.3.3 "Sequence header".
> > + *
> > + * @horizontal_size: combination of elements horizontal_size_value and
> > + * horizontal_size_extension.
> > + * @vertical_size: combination of elements vertical_size_value and
> > + * vertical_size_extension.
> > + * @vbv_buffer_size: combination of elements vbv_buffer_size_value and
> > + * vbv_buffer_size_extension.
> > + * @profile_and_level_indication: see MPEG-2 specification.
> > + * @chroma_format: see MPEG-2 specification.
> > + * @reserved: padding field. Should be zeroed by applications.
> > + * @flags: see V4L2_MPEG2_SEQ_FLAG_{}.
> > + */
> > +struct v4l2_ctrl_mpeg2_sequence {
> > __u16 horizontal_size;
> > __u16 vertical_size;
> > __u32 vbv_buffer_size;
> > -
> > - /* ISO/IEC 13818-2, ITU-T Rec. H.262: Sequence extension */
> > __u16 profile_and_level_indication;
> > __u8 chroma_format;
> > -
> > + __u8 reserved;
> > __u32 flags;
> > };
> >
> > @@ -55,30 +77,80 @@ struct v4l2_mpeg2_sequence {
> > #define V4L2_MPEG2_PIC_FLAG_LOAD_CHROMA_INTRA 0x0400
> > #define V4L2_MPEG2_PIC_FLAG_LOAD_CHROMA_NON_INTRA 0x0800
> >
> > -struct v4l2_mpeg2_picture {
> > - /* ISO/IEC 13818-2, ITU-T Rec. H.262: Picture header */
> > +/**
> > + * struct v4l2_ctrl_mpeg2_picture - MPEG-2 picture header
> > + *
> > + * All the members on this structure match the picture header and picture
> > + * coding extension syntaxes as specified by the MPEG-2 specification.
> > + *
> > + * In particular, the set of quantization load flags V4L2_MPEG2_PIC_FLAG_LOAD_{}
> > + * are specified here in order to allow applications to pass non-default
> > + * quantization matrices. In this case, applications are expected to use
> > + * V4L2_CTRL_TYPE_MPEG2_QUANTIZATION to pass the values of non-default
> > + * matrices.
> > + *
> > + * @picture_coding_type: see MPEG-2 specification.
> > + * @f_code[2][2]: see MPEG-2 specification.
> > + * @intra_dc_precision: see MPEG-2 specification.
> > + * @picture_structure: see V4L2_MPEG2_PIC_{}_FIELD.
> > + * @reserved: padding field. Should be zeroed by applications.
> > + * @flags: see V4L2_MPEG2_PIC_FLAG_{}.
> > + */
> > +struct v4l2_ctrl_mpeg2_picture {
> > __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 reserved;
> > __u32 flags;
> > };
> >
> > +/**
> > + * struct v4l2_ctrl_mpeg2_slice_params - MPEG-2 slice header
> > + *
> > + * @backward_ref_ts: timestamp of the V4L2 capture buffer to use as
> > + * reference for backward prediction.
> > + * @forward_ref_ts: timestamp of the V4L2 capture buffer to use as
> > + * reference for forward prediction. These timestamp refers to the
> > + * timestamp field in struct v4l2_buffer. Use v4l2_timeval_to_ns()
> > + * to convert the struct timeval to a __u64.
> > + * @quantiser_scale_code: quantiser scale integer matching an
> > + * homonymous syntax element.
> > + * @reserved: padding field. Should be zeroed by applications.
> > + */
> > struct v4l2_ctrl_mpeg2_slice_params {
> > __u64 backward_ref_ts;
> > __u64 forward_ref_ts;
> > -
> > - struct v4l2_mpeg2_sequence sequence;
> > - struct v4l2_mpeg2_picture picture;
> > -
> > - /* ISO/IEC 13818-2, ITU-T Rec. H.262: Slice */
> > __u32 quantiser_scale_code;
> > + __u32 reserved;
> > };
> >
> > -/* ISO/IEC 13818-2, ITU-T Rec. H.262: Quant matrix extension */
> > +/**
> > + * struct v4l2_ctrl_mpeg2_quantization - MPEG-2 quantization
> > + *
> > + * Quantization matrices as specified by section 6.3.7
> > + * "Quant matrix extension".
> > + *
> > + * Applications are expected to set the quantization matrices load
> > + * flags V4L2_MPEG2_PIC_FLAG_LOAD_{} in struct v4l2_ctrl_mpeg2_picture
> > + * to tell the kernel that a non-default matrix shall be used
> > + * to decode the picture.
> > + *
> > + * @intra_quantiser_matrix: 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.
> > + * @non_intra_quantiser_matrix: 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.
> > + * @chroma_intra_quantiser_matrix: The quantization matrix coefficients
> > + * for the chominance component of intra-coded frames, in zigzag scanning
> > + * order. Only relevant for 4:2:2 and 4:4:4 YUV formats.
> > + * @chroma_non_intra_quantiser_matrix: The quantization matrix coefficients
> > + * for the chrominance component of non-intra-coded frames, in zigzag scanning
> > + * order. Only relevant for 4:2:2 and 4:4:4 YUV formats.
> > + */
> > struct v4l2_ctrl_mpeg2_quantization {
> > __u8 intra_quantiser_matrix[64];
> > __u8 non_intra_quantiser_matrix[64];
> > diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
> > index cb25f345e9ad..92f4b508f5de 100644
> > --- a/include/media/v4l2-ctrls.h
> > +++ b/include/media/v4l2-ctrls.h
> > @@ -43,6 +43,8 @@ struct video_device;
> > * @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_sequence: Pointer to a MPEG2 sequence structure.
> > + * @p_mpeg2_picture: Pointer to a MPEG2 picture structure.
> > * @p_mpeg2_slice_params: Pointer to a MPEG2 slice parameters structure.
> > * @p_mpeg2_quantization: Pointer to a MPEG2 quantization data structure.
> > * @p_fwht_params: Pointer to a FWHT stateless parameters structure.
> > @@ -67,6 +69,8 @@ union v4l2_ctrl_ptr {
> > u16 *p_u16;
> > u32 *p_u32;
> > char *p_char;
> > + struct v4l2_ctrl_mpeg2_sequence *p_sequence;
> > + struct v4l2_ctrl_mpeg2_picture *p_picture;
>
> These two should be named p_mpeg2_<name> to match the doc comment.
>
> I think this series looks good and aligns MPEG-2 ctrls with other codecs.
> Together with some fixup at [1] this series is
>
> Tested-by: Jonas Karlman <jonas@xxxxxxxxx>
>
> on RK3288 (Hantro G1) with FFmpeg + Kodi.
>
> [1] https://github.com/Kwiboo/linux-rockchip/commit/a6942e0a1e5f03078a37a1c575f76d02d7ba775f
>

Thanks a lot!

Just submitted v3 with your tested-by
and the above fixes.

Ezequiel

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