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
Best regards,
Jonas
> struct v4l2_ctrl_mpeg2_slice_params *p_mpeg2_slice_params;
> struct v4l2_ctrl_mpeg2_quantization *p_mpeg2_quantization;
> struct v4l2_ctrl_fwht_params *p_fwht_params;
>
