+.. _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 :ref:`mpeg2part2`.
+
+.. 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
+ B-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
---------------------
git.samba.org / sfrench / cifs-2.6.git / blobdiff