diff options
Diffstat (limited to 'Documentation/media/uapi/v4l/extended-controls.rst')
| -rw-r--r-- | Documentation/media/uapi/v4l/extended-controls.rst | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/Documentation/media/uapi/v4l/extended-controls.rst b/Documentation/media/uapi/v4l/extended-controls.rst index 65a1d873196b..286a2dd7ec36 100644 --- a/Documentation/media/uapi/v4l/extended-controls.rst +++ b/Documentation/media/uapi/v4l/extended-controls.rst @@ -1,4 +1,11 @@ -.. -*- coding: utf-8; mode: rst -*- +.. Permission is granted to copy, distribute and/or modify this +.. document under the terms of the GNU Free Documentation License, +.. Version 1.1 or any later version published by the Free Software +.. Foundation, with no Invariant Sections, no Front-Cover Texts +.. and no Back-Cover Texts. A copy of the license is included at +.. Documentation/media/uapi/fdl-appendix.rst. +.. +.. TODO: replace it to GFDL-1.1-or-later WITH no-invariant-sections .. _extended-controls: @@ -1110,10 +1117,16 @@ enum v4l2_mpeg_video_h264_loop_filter_mode - ``V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA (integer)`` Loop filter alpha coefficient, defined in the H264 standard. + This value corresponds to the slice_alpha_c0_offset_div2 slice header + field, and should be in the range of -6 to +6, inclusive. The actual alpha + offset FilterOffsetA is twice this value. Applicable to the H264 encoder. ``V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA (integer)`` Loop filter beta coefficient, defined in the H264 standard. + This corresponds to the slice_beta_offset_div2 slice header field, and + should be in the range of -6 to +6, inclusive. The actual beta offset + FilterOffsetB is twice this value. Applicable to the H264 encoder. .. _v4l2-mpeg-video-h264-entropy-mode: @@ -1505,6 +1518,11 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type - configuring a stateless hardware decoding pipeline for MPEG-2. The bitstream parameters are defined according to :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_slice_params .. cssclass:: longtable @@ -1625,6 +1643,11 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type - Specifies quantization matrices (as extracted from the bitstream) for the associated MPEG-2 slice data. + .. note:: + + This compound control is not yet part of the public kernel API and + it is expected to change. + .. c:type:: v4l2_ctrl_mpeg2_quantization .. cssclass:: longtable @@ -3980,7 +4003,7 @@ demodulator. It receives radio frequency (RF) from the antenna and converts that received signal to lower intermediate frequency (IF) or baseband frequency (BB). Tuners that could do baseband output are often called Zero-IF tuners. Older tuners were typically simple PLL tuners -inside a metal box, whilst newer ones are highly integrated chips +inside a metal box, while newer ones are highly integrated chips without a metal box "silicon tuners". These controls are mostly applicable for new feature rich silicon tuners, just because older tuners does not have much adjustable features. |