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1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
3 .. _jpeg-controls:
15 .. _jpeg-control-id:
28     spatial dimension. See :ref:`itu-t81`, clause A.1.1. for more
35 .. flat-table::
36     :header-rows:  0
37     :stub-columns: 0
39     * - ``V4L2_JPEG_CHROMA_SUBSAMPLING_444``
40       - No chroma subsampling, each pixel has Y, Cr and Cb values.
41     * - ``V4L2_JPEG_CHROMA_SUBSAMPLING_422``
42       - Horizontally subsample Cr, Cb components by a factor of 2.
43     * - ``V4L2_JPEG_CHROMA_SUBSAMPLING_420``
44       - Subsample Cr, Cb components horizontally and vertically by 2.
45     * - ``V4L2_JPEG_CHROMA_SUBSAMPLING_411``
46       - Horizontally subsample Cr, Cb components by a factor of 4.
47     * - ``V4L2_JPEG_CHROMA_SUBSAMPLING_410``
48       - Subsample Cr, Cb components horizontally by 4 and vertically by 2.
49     * - ``V4L2_JPEG_CHROMA_SUBSAMPLING_GRAY``
50       - Use only luminance component.
64 .. _jpeg-quality-control:
67     Determines trade-off between image quality and size.
75     The value range of this control is driver-specific. Only positive,
76     non-zero values are meaningful. The recommended range is 1 - 100,
79 .. _jpeg-active-marker-control:
87 .. flat-table::
88     :header-rows:  0
89     :stub-columns: 0
91     * - ``V4L2_JPEG_ACTIVE_MARKER_APP0``
92       - Application data segment APP\ :sub:`0`.
93     * - ``V4L2_JPEG_ACTIVE_MARKER_APP1``
94       - Application data segment APP\ :sub:`1`.
95     * - ``V4L2_JPEG_ACTIVE_MARKER_COM``
96       - Comment segment.
97     * - ``V4L2_JPEG_ACTIVE_MARKER_DQT``
98       - Quantization tables segment.
99     * - ``V4L2_JPEG_ACTIVE_MARKER_DHT``
100       - Huffman tables segment.
104 For more details about JPEG specification, refer to :ref:`itu-t81`,
105 :ref:`jfif`, :ref:`w3c-jpeg-jfif`.