1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
5 ***********************
6 Codec Control Reference
7 ***********************
9 Below all controls within the Codec control class are described. First
10 the generic controls, then controls specific for certain hardware.
14 These controls are applicable to all codecs and not just MPEG. The
15 defines are prefixed with V4L2_CID_MPEG/V4L2_MPEG as the controls
16 were originally made for MPEG codecs and later extended to cover all
20 Generic Codec Controls
21 ======================
29 ``V4L2_CID_CODEC_CLASS (class)``
30 The Codec class descriptor. Calling
31 :ref:`VIDIOC_QUERYCTRL` for this control will
32 return a description of this control class. This description can be
33 used as the caption of a Tab page in a GUI, for example.
35 .. _v4l2-mpeg-stream-type:
37 ``V4L2_CID_MPEG_STREAM_TYPE``
40 enum v4l2_mpeg_stream_type -
41 The MPEG-1, -2 or -4 output stream type. One cannot assume anything
42 here. Each hardware MPEG encoder tends to support different subsets
43 of the available MPEG stream types. This control is specific to
44 multiplexed MPEG streams. The currently defined stream types are:
52 * - ``V4L2_MPEG_STREAM_TYPE_MPEG2_PS``
53 - MPEG-2 program stream
54 * - ``V4L2_MPEG_STREAM_TYPE_MPEG2_TS``
55 - MPEG-2 transport stream
56 * - ``V4L2_MPEG_STREAM_TYPE_MPEG1_SS``
57 - MPEG-1 system stream
58 * - ``V4L2_MPEG_STREAM_TYPE_MPEG2_DVD``
59 - MPEG-2 DVD-compatible stream
60 * - ``V4L2_MPEG_STREAM_TYPE_MPEG1_VCD``
61 - MPEG-1 VCD-compatible stream
62 * - ``V4L2_MPEG_STREAM_TYPE_MPEG2_SVCD``
63 - MPEG-2 SVCD-compatible stream
67 ``V4L2_CID_MPEG_STREAM_PID_PMT (integer)``
68 Program Map Table Packet ID for the MPEG transport stream (default
71 ``V4L2_CID_MPEG_STREAM_PID_AUDIO (integer)``
72 Audio Packet ID for the MPEG transport stream (default 256)
74 ``V4L2_CID_MPEG_STREAM_PID_VIDEO (integer)``
75 Video Packet ID for the MPEG transport stream (default 260)
77 ``V4L2_CID_MPEG_STREAM_PID_PCR (integer)``
78 Packet ID for the MPEG transport stream carrying PCR fields (default
81 ``V4L2_CID_MPEG_STREAM_PES_ID_AUDIO (integer)``
84 ``V4L2_CID_MPEG_STREAM_PES_ID_VIDEO (integer)``
87 .. _v4l2-mpeg-stream-vbi-fmt:
89 ``V4L2_CID_MPEG_STREAM_VBI_FMT``
92 enum v4l2_mpeg_stream_vbi_fmt -
93 Some cards can embed VBI data (e. g. Closed Caption, Teletext) into
94 the MPEG stream. This control selects whether VBI data should be
95 embedded, and if so, what embedding method should be used. The list
96 of possible VBI formats depends on the driver. The currently defined
101 .. tabularcolumns:: |p{6.6 cm}|p{10.9cm}|
107 * - ``V4L2_MPEG_STREAM_VBI_FMT_NONE``
108 - No VBI in the MPEG stream
109 * - ``V4L2_MPEG_STREAM_VBI_FMT_IVTV``
110 - VBI in private packets, IVTV format (documented in the kernel
112 ``Documentation/userspace-api/media/drivers/cx2341x-uapi.rst``)
116 .. _v4l2-mpeg-audio-sampling-freq:
118 ``V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ``
121 enum v4l2_mpeg_audio_sampling_freq -
122 MPEG Audio sampling frequency. Possible values are:
130 * - ``V4L2_MPEG_AUDIO_SAMPLING_FREQ_44100``
132 * - ``V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000``
134 * - ``V4L2_MPEG_AUDIO_SAMPLING_FREQ_32000``
139 .. _v4l2-mpeg-audio-encoding:
141 ``V4L2_CID_MPEG_AUDIO_ENCODING``
144 enum v4l2_mpeg_audio_encoding -
145 MPEG Audio encoding. This control is specific to multiplexed MPEG
146 streams. Possible values are:
154 * - ``V4L2_MPEG_AUDIO_ENCODING_LAYER_1``
155 - MPEG-1/2 Layer I encoding
156 * - ``V4L2_MPEG_AUDIO_ENCODING_LAYER_2``
157 - MPEG-1/2 Layer II encoding
158 * - ``V4L2_MPEG_AUDIO_ENCODING_LAYER_3``
159 - MPEG-1/2 Layer III encoding
160 * - ``V4L2_MPEG_AUDIO_ENCODING_AAC``
161 - MPEG-2/4 AAC (Advanced Audio Coding)
162 * - ``V4L2_MPEG_AUDIO_ENCODING_AC3``
163 - AC-3 aka ATSC A/52 encoding
167 .. _v4l2-mpeg-audio-l1-bitrate:
169 ``V4L2_CID_MPEG_AUDIO_L1_BITRATE``
172 enum v4l2_mpeg_audio_l1_bitrate -
173 MPEG-1/2 Layer I bitrate. Possible values are:
181 * - ``V4L2_MPEG_AUDIO_L1_BITRATE_32K``
183 * - ``V4L2_MPEG_AUDIO_L1_BITRATE_64K``
185 * - ``V4L2_MPEG_AUDIO_L1_BITRATE_96K``
187 * - ``V4L2_MPEG_AUDIO_L1_BITRATE_128K``
189 * - ``V4L2_MPEG_AUDIO_L1_BITRATE_160K``
191 * - ``V4L2_MPEG_AUDIO_L1_BITRATE_192K``
193 * - ``V4L2_MPEG_AUDIO_L1_BITRATE_224K``
195 * - ``V4L2_MPEG_AUDIO_L1_BITRATE_256K``
197 * - ``V4L2_MPEG_AUDIO_L1_BITRATE_288K``
199 * - ``V4L2_MPEG_AUDIO_L1_BITRATE_320K``
201 * - ``V4L2_MPEG_AUDIO_L1_BITRATE_352K``
203 * - ``V4L2_MPEG_AUDIO_L1_BITRATE_384K``
205 * - ``V4L2_MPEG_AUDIO_L1_BITRATE_416K``
207 * - ``V4L2_MPEG_AUDIO_L1_BITRATE_448K``
212 .. _v4l2-mpeg-audio-l2-bitrate:
214 ``V4L2_CID_MPEG_AUDIO_L2_BITRATE``
217 enum v4l2_mpeg_audio_l2_bitrate -
218 MPEG-1/2 Layer II bitrate. Possible values are:
226 * - ``V4L2_MPEG_AUDIO_L2_BITRATE_32K``
228 * - ``V4L2_MPEG_AUDIO_L2_BITRATE_48K``
230 * - ``V4L2_MPEG_AUDIO_L2_BITRATE_56K``
232 * - ``V4L2_MPEG_AUDIO_L2_BITRATE_64K``
234 * - ``V4L2_MPEG_AUDIO_L2_BITRATE_80K``
236 * - ``V4L2_MPEG_AUDIO_L2_BITRATE_96K``
238 * - ``V4L2_MPEG_AUDIO_L2_BITRATE_112K``
240 * - ``V4L2_MPEG_AUDIO_L2_BITRATE_128K``
242 * - ``V4L2_MPEG_AUDIO_L2_BITRATE_160K``
244 * - ``V4L2_MPEG_AUDIO_L2_BITRATE_192K``
246 * - ``V4L2_MPEG_AUDIO_L2_BITRATE_224K``
248 * - ``V4L2_MPEG_AUDIO_L2_BITRATE_256K``
250 * - ``V4L2_MPEG_AUDIO_L2_BITRATE_320K``
252 * - ``V4L2_MPEG_AUDIO_L2_BITRATE_384K``
257 .. _v4l2-mpeg-audio-l3-bitrate:
259 ``V4L2_CID_MPEG_AUDIO_L3_BITRATE``
262 enum v4l2_mpeg_audio_l3_bitrate -
263 MPEG-1/2 Layer III bitrate. Possible values are:
271 * - ``V4L2_MPEG_AUDIO_L3_BITRATE_32K``
273 * - ``V4L2_MPEG_AUDIO_L3_BITRATE_40K``
275 * - ``V4L2_MPEG_AUDIO_L3_BITRATE_48K``
277 * - ``V4L2_MPEG_AUDIO_L3_BITRATE_56K``
279 * - ``V4L2_MPEG_AUDIO_L3_BITRATE_64K``
281 * - ``V4L2_MPEG_AUDIO_L3_BITRATE_80K``
283 * - ``V4L2_MPEG_AUDIO_L3_BITRATE_96K``
285 * - ``V4L2_MPEG_AUDIO_L3_BITRATE_112K``
287 * - ``V4L2_MPEG_AUDIO_L3_BITRATE_128K``
289 * - ``V4L2_MPEG_AUDIO_L3_BITRATE_160K``
291 * - ``V4L2_MPEG_AUDIO_L3_BITRATE_192K``
293 * - ``V4L2_MPEG_AUDIO_L3_BITRATE_224K``
295 * - ``V4L2_MPEG_AUDIO_L3_BITRATE_256K``
297 * - ``V4L2_MPEG_AUDIO_L3_BITRATE_320K``
302 ``V4L2_CID_MPEG_AUDIO_AAC_BITRATE (integer)``
303 AAC bitrate in bits per second.
305 .. _v4l2-mpeg-audio-ac3-bitrate:
307 ``V4L2_CID_MPEG_AUDIO_AC3_BITRATE``
310 enum v4l2_mpeg_audio_ac3_bitrate -
311 AC-3 bitrate. Possible values are:
319 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_32K``
321 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_40K``
323 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_48K``
325 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_56K``
327 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_64K``
329 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_80K``
331 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_96K``
333 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_112K``
335 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_128K``
337 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_160K``
339 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_192K``
341 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_224K``
343 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_256K``
345 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_320K``
347 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_384K``
349 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_448K``
351 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_512K``
353 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_576K``
355 * - ``V4L2_MPEG_AUDIO_AC3_BITRATE_640K``
360 .. _v4l2-mpeg-audio-mode:
362 ``V4L2_CID_MPEG_AUDIO_MODE``
365 enum v4l2_mpeg_audio_mode -
366 MPEG Audio mode. Possible values are:
374 * - ``V4L2_MPEG_AUDIO_MODE_STEREO``
376 * - ``V4L2_MPEG_AUDIO_MODE_JOINT_STEREO``
378 * - ``V4L2_MPEG_AUDIO_MODE_DUAL``
380 * - ``V4L2_MPEG_AUDIO_MODE_MONO``
385 .. _v4l2-mpeg-audio-mode-extension:
387 ``V4L2_CID_MPEG_AUDIO_MODE_EXTENSION``
390 enum v4l2_mpeg_audio_mode_extension -
391 Joint Stereo audio mode extension. In Layer I and II they indicate
392 which subbands are in intensity stereo. All other subbands are coded
393 in stereo. Layer III is not (yet) supported. Possible values are:
401 * - ``V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_4``
402 - Subbands 4-31 in intensity stereo
403 * - ``V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_8``
404 - Subbands 8-31 in intensity stereo
405 * - ``V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_12``
406 - Subbands 12-31 in intensity stereo
407 * - ``V4L2_MPEG_AUDIO_MODE_EXTENSION_BOUND_16``
408 - Subbands 16-31 in intensity stereo
412 .. _v4l2-mpeg-audio-emphasis:
414 ``V4L2_CID_MPEG_AUDIO_EMPHASIS``
417 enum v4l2_mpeg_audio_emphasis -
418 Audio Emphasis. Possible values are:
426 * - ``V4L2_MPEG_AUDIO_EMPHASIS_NONE``
428 * - ``V4L2_MPEG_AUDIO_EMPHASIS_50_DIV_15_uS``
429 - 50/15 microsecond emphasis
430 * - ``V4L2_MPEG_AUDIO_EMPHASIS_CCITT_J17``
435 .. _v4l2-mpeg-audio-crc:
437 ``V4L2_CID_MPEG_AUDIO_CRC``
440 enum v4l2_mpeg_audio_crc -
441 CRC method. Possible values are:
449 * - ``V4L2_MPEG_AUDIO_CRC_NONE``
451 * - ``V4L2_MPEG_AUDIO_CRC_CRC16``
452 - 16 bit parity check
456 ``V4L2_CID_MPEG_AUDIO_MUTE (boolean)``
457 Mutes the audio when capturing. This is not done by muting audio
458 hardware, which can still produce a slight hiss, but in the encoder
459 itself, guaranteeing a fixed and reproducible audio bitstream. 0 =
462 .. _v4l2-mpeg-audio-dec-playback:
464 ``V4L2_CID_MPEG_AUDIO_DEC_PLAYBACK``
467 enum v4l2_mpeg_audio_dec_playback -
468 Determines how monolingual audio should be played back. Possible
473 .. tabularcolumns:: |p{9.8cm}|p{7.7cm}|
479 * - ``V4L2_MPEG_AUDIO_DEC_PLAYBACK_AUTO``
480 - Automatically determines the best playback mode.
481 * - ``V4L2_MPEG_AUDIO_DEC_PLAYBACK_STEREO``
483 * - ``V4L2_MPEG_AUDIO_DEC_PLAYBACK_LEFT``
484 - Left channel playback.
485 * - ``V4L2_MPEG_AUDIO_DEC_PLAYBACK_RIGHT``
486 - Right channel playback.
487 * - ``V4L2_MPEG_AUDIO_DEC_PLAYBACK_MONO``
489 * - ``V4L2_MPEG_AUDIO_DEC_PLAYBACK_SWAPPED_STEREO``
490 - Stereo playback with swapped left and right channels.
494 .. _v4l2-mpeg-audio-dec-multilingual-playback:
496 ``V4L2_CID_MPEG_AUDIO_DEC_MULTILINGUAL_PLAYBACK``
499 enum v4l2_mpeg_audio_dec_playback -
500 Determines how multilingual audio should be played back.
502 .. _v4l2-mpeg-video-encoding:
504 ``V4L2_CID_MPEG_VIDEO_ENCODING``
507 enum v4l2_mpeg_video_encoding -
508 MPEG Video encoding method. This control is specific to multiplexed
509 MPEG streams. Possible values are:
517 * - ``V4L2_MPEG_VIDEO_ENCODING_MPEG_1``
518 - MPEG-1 Video encoding
519 * - ``V4L2_MPEG_VIDEO_ENCODING_MPEG_2``
520 - MPEG-2 Video encoding
521 * - ``V4L2_MPEG_VIDEO_ENCODING_MPEG_4_AVC``
522 - MPEG-4 AVC (H.264) Video encoding
526 .. _v4l2-mpeg-video-aspect:
528 ``V4L2_CID_MPEG_VIDEO_ASPECT``
531 enum v4l2_mpeg_video_aspect -
532 Video aspect. Possible values are:
540 * - ``V4L2_MPEG_VIDEO_ASPECT_1x1``
541 * - ``V4L2_MPEG_VIDEO_ASPECT_4x3``
542 * - ``V4L2_MPEG_VIDEO_ASPECT_16x9``
543 * - ``V4L2_MPEG_VIDEO_ASPECT_221x100``
547 ``V4L2_CID_MPEG_VIDEO_B_FRAMES (integer)``
548 Number of B-Frames (default 2)
550 ``V4L2_CID_MPEG_VIDEO_GOP_SIZE (integer)``
551 GOP size (default 12)
553 ``V4L2_CID_MPEG_VIDEO_GOP_CLOSURE (boolean)``
554 GOP closure (default 1)
556 ``V4L2_CID_MPEG_VIDEO_PULLDOWN (boolean)``
557 Enable 3:2 pulldown (default 0)
559 .. _v4l2-mpeg-video-bitrate-mode:
561 ``V4L2_CID_MPEG_VIDEO_BITRATE_MODE``
564 enum v4l2_mpeg_video_bitrate_mode -
565 Video bitrate mode. Possible values are:
573 * - ``V4L2_MPEG_VIDEO_BITRATE_MODE_VBR``
575 * - ``V4L2_MPEG_VIDEO_BITRATE_MODE_CBR``
577 * - ``V4L2_MPEG_VIDEO_BITRATE_MODE_CQ``
582 ``V4L2_CID_MPEG_VIDEO_BITRATE (integer)``
583 Video bitrate in bits per second.
585 ``V4L2_CID_MPEG_VIDEO_BITRATE_PEAK (integer)``
586 Peak video bitrate in bits per second. Must be larger or equal to
587 the average video bitrate. It is ignored if the video bitrate mode
588 is set to constant bitrate.
590 ``V4L2_CID_MPEG_VIDEO_CONSTANT_QUALITY (integer)``
591 Constant quality level control. This control is applicable when
592 ``V4L2_CID_MPEG_VIDEO_BITRATE_MODE`` value is
593 ``V4L2_MPEG_VIDEO_BITRATE_MODE_CQ``. Valid range is 1 to 100
594 where 1 indicates lowest quality and 100 indicates highest quality.
595 Encoder will decide the appropriate quantization parameter and
596 bitrate to produce requested frame quality.
599 ``V4L2_CID_MPEG_VIDEO_FRAME_SKIP_MODE (enum)``
601 enum v4l2_mpeg_video_frame_skip_mode -
602 Indicates in what conditions the encoder should skip frames. If
603 encoding a frame would cause the encoded stream to be larger then a
604 chosen data limit then the frame will be skipped. Possible values
608 .. tabularcolumns:: |p{9.2cm}|p{8.3cm}|
618 * - ``V4L2_MPEG_FRAME_SKIP_MODE_DISABLED``
619 - Frame skip mode is disabled.
620 * - ``V4L2_MPEG_FRAME_SKIP_MODE_LEVEL_LIMIT``
621 - Frame skip mode enabled and buffer limit is set by the chosen
622 level and is defined by the standard.
623 * - ``V4L2_MPEG_FRAME_SKIP_MODE_BUF_LIMIT``
624 - Frame skip mode enabled and buffer limit is set by the
625 :ref:`VBV (MPEG1/2/4) <v4l2-mpeg-video-vbv-size>` or
626 :ref:`CPB (H264) buffer size <v4l2-mpeg-video-h264-cpb-size>` control.
632 ``V4L2_CID_MPEG_VIDEO_TEMPORAL_DECIMATION (integer)``
633 For every captured frame, skip this many subsequent frames (default
636 ``V4L2_CID_MPEG_VIDEO_MUTE (boolean)``
637 "Mutes" the video to a fixed color when capturing. This is useful
638 for testing, to produce a fixed video bitstream. 0 = unmuted, 1 =
641 ``V4L2_CID_MPEG_VIDEO_MUTE_YUV (integer)``
642 Sets the "mute" color of the video. The supplied 32-bit integer is
643 interpreted as follows (bit 0 = least significant bit):
652 - V chrominance information
654 - U chrominance information
656 - Y luminance information
662 .. _v4l2-mpeg-video-dec-pts:
664 ``V4L2_CID_MPEG_VIDEO_DEC_PTS (integer64)``
665 This read-only control returns the 33-bit video Presentation Time
666 Stamp as defined in ITU T-REC-H.222.0 and ISO/IEC 13818-1 of the
667 currently displayed frame. This is the same PTS as is used in
668 :ref:`VIDIOC_DECODER_CMD`.
670 .. _v4l2-mpeg-video-dec-frame:
672 ``V4L2_CID_MPEG_VIDEO_DEC_FRAME (integer64)``
673 This read-only control returns the frame counter of the frame that
674 is currently displayed (decoded). This value is reset to 0 whenever
675 the decoder is started.
677 ``V4L2_CID_MPEG_VIDEO_DECODER_SLICE_INTERFACE (boolean)``
678 If enabled the decoder expects to receive a single slice per buffer,
679 otherwise the decoder expects a single frame in per buffer.
680 Applicable to the decoder, all codecs.
682 ``V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_ENABLE (boolean)``
683 Enable writing sample aspect ratio in the Video Usability
684 Information. Applicable to the H264 encoder.
686 .. _v4l2-mpeg-video-h264-vui-sar-idc:
688 ``V4L2_CID_MPEG_VIDEO_H264_VUI_SAR_IDC``
691 enum v4l2_mpeg_video_h264_vui_sar_idc -
692 VUI sample aspect ratio indicator for H.264 encoding. The value is
693 defined in the table E-1 in the standard. Applicable to the H264
702 * - ``V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_UNSPECIFIED``
704 * - ``V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_1x1``
706 * - ``V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_12x11``
708 * - ``V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_10x11``
710 * - ``V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_16x11``
712 * - ``V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_40x33``
714 * - ``V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_24x11``
716 * - ``V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_20x11``
718 * - ``V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_32x11``
720 * - ``V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_80x33``
722 * - ``V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_18x11``
724 * - ``V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_15x11``
726 * - ``V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_64x33``
728 * - ``V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_160x99``
730 * - ``V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_4x3``
732 * - ``V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_3x2``
734 * - ``V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_2x1``
736 * - ``V4L2_MPEG_VIDEO_H264_VUI_SAR_IDC_EXTENDED``
741 ``V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_WIDTH (integer)``
742 Extended sample aspect ratio width for H.264 VUI encoding.
743 Applicable to the H264 encoder.
745 ``V4L2_CID_MPEG_VIDEO_H264_VUI_EXT_SAR_HEIGHT (integer)``
746 Extended sample aspect ratio height for H.264 VUI encoding.
747 Applicable to the H264 encoder.
749 .. _v4l2-mpeg-video-h264-level:
751 ``V4L2_CID_MPEG_VIDEO_H264_LEVEL``
754 enum v4l2_mpeg_video_h264_level -
755 The level information for the H264 video elementary stream.
756 Applicable to the H264 encoder. Possible values are:
764 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_1_0``
766 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_1B``
768 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_1_1``
770 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_1_2``
772 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_1_3``
774 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_2_0``
776 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_2_1``
778 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_2_2``
780 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_3_0``
782 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_3_1``
784 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_3_2``
786 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_4_0``
788 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_4_1``
790 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_4_2``
792 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_5_0``
794 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_5_1``
796 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_5_2``
798 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_6_0``
800 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_6_1``
802 * - ``V4L2_MPEG_VIDEO_H264_LEVEL_6_2``
807 .. _v4l2-mpeg-video-mpeg2-level:
809 ``V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL``
812 enum v4l2_mpeg_video_mpeg2_level -
813 The level information for the MPEG2 elementary stream. Applicable to
814 MPEG2 codecs. Possible values are:
822 * - ``V4L2_MPEG_VIDEO_MPEG2_LEVEL_LOW``
824 * - ``V4L2_MPEG_VIDEO_MPEG2_LEVEL_MAIN``
826 * - ``V4L2_MPEG_VIDEO_MPEG2_LEVEL_HIGH_1440``
827 - High-1440 Level (H-14)
828 * - ``V4L2_MPEG_VIDEO_MPEG2_LEVEL_HIGH``
833 .. _v4l2-mpeg-video-mpeg4-level:
835 ``V4L2_CID_MPEG_VIDEO_MPEG4_LEVEL``
838 enum v4l2_mpeg_video_mpeg4_level -
839 The level information for the MPEG4 elementary stream. Applicable to
840 the MPEG4 encoder. Possible values are:
848 * - ``V4L2_MPEG_VIDEO_MPEG4_LEVEL_0``
850 * - ``V4L2_MPEG_VIDEO_MPEG4_LEVEL_0B``
852 * - ``V4L2_MPEG_VIDEO_MPEG4_LEVEL_1``
854 * - ``V4L2_MPEG_VIDEO_MPEG4_LEVEL_2``
856 * - ``V4L2_MPEG_VIDEO_MPEG4_LEVEL_3``
858 * - ``V4L2_MPEG_VIDEO_MPEG4_LEVEL_3B``
860 * - ``V4L2_MPEG_VIDEO_MPEG4_LEVEL_4``
862 * - ``V4L2_MPEG_VIDEO_MPEG4_LEVEL_5``
867 .. _v4l2-mpeg-video-h264-profile:
869 ``V4L2_CID_MPEG_VIDEO_H264_PROFILE``
872 enum v4l2_mpeg_video_h264_profile -
873 The profile information for H264. Applicable to the H264 encoder.
882 * - ``V4L2_MPEG_VIDEO_H264_PROFILE_BASELINE``
884 * - ``V4L2_MPEG_VIDEO_H264_PROFILE_CONSTRAINED_BASELINE``
885 - Constrained Baseline profile
886 * - ``V4L2_MPEG_VIDEO_H264_PROFILE_MAIN``
888 * - ``V4L2_MPEG_VIDEO_H264_PROFILE_EXTENDED``
890 * - ``V4L2_MPEG_VIDEO_H264_PROFILE_HIGH``
892 * - ``V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_10``
894 * - ``V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_422``
896 * - ``V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_444_PREDICTIVE``
897 - High 444 Predictive profile
898 * - ``V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_10_INTRA``
899 - High 10 Intra profile
900 * - ``V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_422_INTRA``
901 - High 422 Intra profile
902 * - ``V4L2_MPEG_VIDEO_H264_PROFILE_HIGH_444_INTRA``
903 - High 444 Intra profile
904 * - ``V4L2_MPEG_VIDEO_H264_PROFILE_CAVLC_444_INTRA``
905 - CAVLC 444 Intra profile
906 * - ``V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_BASELINE``
907 - Scalable Baseline profile
908 * - ``V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_HIGH``
909 - Scalable High profile
910 * - ``V4L2_MPEG_VIDEO_H264_PROFILE_SCALABLE_HIGH_INTRA``
911 - Scalable High Intra profile
912 * - ``V4L2_MPEG_VIDEO_H264_PROFILE_STEREO_HIGH``
913 - Stereo High profile
914 * - ``V4L2_MPEG_VIDEO_H264_PROFILE_MULTIVIEW_HIGH``
915 - Multiview High profile
916 * - ``V4L2_MPEG_VIDEO_H264_PROFILE_CONSTRAINED_HIGH``
917 - Constrained High profile
921 .. _v4l2-mpeg-video-mpeg2-profile:
923 ``V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE``
926 enum v4l2_mpeg_video_mpeg2_profile -
927 The profile information for MPEG2. Applicable to MPEG2 codecs.
936 * - ``V4L2_MPEG_VIDEO_MPEG2_PROFILE_SIMPLE``
937 - Simple profile (SP)
938 * - ``V4L2_MPEG_VIDEO_MPEG2_PROFILE_MAIN``
940 * - ``V4L2_MPEG_VIDEO_MPEG2_PROFILE_SNR_SCALABLE``
941 - SNR Scalable profile (SNR)
942 * - ``V4L2_MPEG_VIDEO_MPEG2_PROFILE_SPATIALLY_SCALABLE``
943 - Spatially Scalable profile (Spt)
944 * - ``V4L2_MPEG_VIDEO_MPEG2_PROFILE_HIGH``
946 * - ``V4L2_MPEG_VIDEO_MPEG2_PROFILE_MULTIVIEW``
947 - Multi-view profile (MVP)
951 .. _v4l2-mpeg-video-mpeg4-profile:
953 ``V4L2_CID_MPEG_VIDEO_MPEG4_PROFILE``
956 enum v4l2_mpeg_video_mpeg4_profile -
957 The profile information for MPEG4. Applicable to the MPEG4 encoder.
966 * - ``V4L2_MPEG_VIDEO_MPEG4_PROFILE_SIMPLE``
968 * - ``V4L2_MPEG_VIDEO_MPEG4_PROFILE_ADVANCED_SIMPLE``
969 - Advanced Simple profile
970 * - ``V4L2_MPEG_VIDEO_MPEG4_PROFILE_CORE``
972 * - ``V4L2_MPEG_VIDEO_MPEG4_PROFILE_SIMPLE_SCALABLE``
973 - Simple Scalable profile
974 * - ``V4L2_MPEG_VIDEO_MPEG4_PROFILE_ADVANCED_CODING_EFFICIENCY``
979 ``V4L2_CID_MPEG_VIDEO_MAX_REF_PIC (integer)``
980 The maximum number of reference pictures used for encoding.
981 Applicable to the encoder.
983 .. _v4l2-mpeg-video-multi-slice-mode:
985 ``V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE``
988 enum v4l2_mpeg_video_multi_slice_mode -
989 Determines how the encoder should handle division of frame into
990 slices. Applicable to the encoder. Possible values are:
994 .. tabularcolumns:: |p{9.6cm}|p{7.9cm}|
1000 * - ``V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_SINGLE``
1001 - Single slice per frame.
1002 * - ``V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB``
1003 - Multiple slices with set maximum number of macroblocks per slice.
1004 * - ``V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_BYTES``
1005 - Multiple slice with set maximum size in bytes per slice.
1009 ``V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_MB (integer)``
1010 The maximum number of macroblocks in a slice. Used when
1011 ``V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE`` is set to
1012 ``V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_MB``. Applicable to the
1015 ``V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MAX_BYTES (integer)``
1016 The maximum size of a slice in bytes. Used when
1017 ``V4L2_CID_MPEG_VIDEO_MULTI_SLICE_MODE`` is set to
1018 ``V4L2_MPEG_VIDEO_MULTI_SLICE_MODE_MAX_BYTES``. Applicable to the
1021 .. _v4l2-mpeg-video-h264-loop-filter-mode:
1023 ``V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_MODE``
1026 enum v4l2_mpeg_video_h264_loop_filter_mode -
1027 Loop filter mode for H264 encoder. Possible values are:
1033 .. tabularcolumns:: |p{13.6cm}|p{3.9cm}|
1039 * - ``V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_ENABLED``
1040 - Loop filter is enabled.
1041 * - ``V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_DISABLED``
1042 - Loop filter is disabled.
1043 * - ``V4L2_MPEG_VIDEO_H264_LOOP_FILTER_MODE_DISABLED_AT_SLICE_BOUNDARY``
1044 - Loop filter is disabled at the slice boundary.
1051 ``V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_ALPHA (integer)``
1052 Loop filter alpha coefficient, defined in the H264 standard.
1053 This value corresponds to the slice_alpha_c0_offset_div2 slice header
1054 field, and should be in the range of -6 to +6, inclusive. The actual alpha
1055 offset FilterOffsetA is twice this value.
1056 Applicable to the H264 encoder.
1058 ``V4L2_CID_MPEG_VIDEO_H264_LOOP_FILTER_BETA (integer)``
1059 Loop filter beta coefficient, defined in the H264 standard.
1060 This corresponds to the slice_beta_offset_div2 slice header field, and
1061 should be in the range of -6 to +6, inclusive. The actual beta offset
1062 FilterOffsetB is twice this value.
1063 Applicable to the H264 encoder.
1065 .. _v4l2-mpeg-video-h264-entropy-mode:
1067 ``V4L2_CID_MPEG_VIDEO_H264_ENTROPY_MODE``
1070 enum v4l2_mpeg_video_h264_entropy_mode -
1071 Entropy coding mode for H264 - CABAC/CAVALC. Applicable to the H264
1072 encoder. Possible values are:
1075 .. tabularcolumns:: |p{9.0cm}|p{8.5cm}|
1082 * - ``V4L2_MPEG_VIDEO_H264_ENTROPY_MODE_CAVLC``
1083 - Use CAVLC entropy coding.
1084 * - ``V4L2_MPEG_VIDEO_H264_ENTROPY_MODE_CABAC``
1085 - Use CABAC entropy coding.
1089 ``V4L2_CID_MPEG_VIDEO_H264_8X8_TRANSFORM (boolean)``
1090 Enable 8X8 transform for H264. Applicable to the H264 encoder.
1092 ``V4L2_CID_MPEG_VIDEO_H264_CONSTRAINED_INTRA_PREDICTION (boolean)``
1093 Enable constrained intra prediction for H264. Applicable to the H264
1096 ``V4L2_CID_MPEG_VIDEO_H264_CHROMA_QP_INDEX_OFFSET (integer)``
1097 Specify the offset that should be added to the luma quantization
1098 parameter to determine the chroma quantization parameter. Applicable
1099 to the H264 encoder.
1101 ``V4L2_CID_MPEG_VIDEO_CYCLIC_INTRA_REFRESH_MB (integer)``
1102 Cyclic intra macroblock refresh. This is the number of continuous
1103 macroblocks refreshed every frame. Each frame a successive set of
1104 macroblocks is refreshed until the cycle completes and starts from
1105 the top of the frame. Applicable to H264, H263 and MPEG4 encoder.
1107 ``V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE (boolean)``
1108 Frame level rate control enable. If this control is disabled then
1109 the quantization parameter for each frame type is constant and set
1110 with appropriate controls (e.g.
1111 ``V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP``). If frame rate control is
1112 enabled then quantization parameter is adjusted to meet the chosen
1113 bitrate. Minimum and maximum value for the quantization parameter
1114 can be set with appropriate controls (e.g.
1115 ``V4L2_CID_MPEG_VIDEO_H263_MIN_QP``). Applicable to encoders.
1117 ``V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE (boolean)``
1118 Macroblock level rate control enable. Applicable to the MPEG4 and
1121 ``V4L2_CID_MPEG_VIDEO_MPEG4_QPEL (boolean)``
1122 Quarter pixel motion estimation for MPEG4. Applicable to the MPEG4
1125 ``V4L2_CID_MPEG_VIDEO_H263_I_FRAME_QP (integer)``
1126 Quantization parameter for an I frame for H263. Valid range: from 1
1129 ``V4L2_CID_MPEG_VIDEO_H263_MIN_QP (integer)``
1130 Minimum quantization parameter for H263. Valid range: from 1 to 31.
1132 ``V4L2_CID_MPEG_VIDEO_H263_MAX_QP (integer)``
1133 Maximum quantization parameter for H263. Valid range: from 1 to 31.
1135 ``V4L2_CID_MPEG_VIDEO_H263_P_FRAME_QP (integer)``
1136 Quantization parameter for an P frame for H263. Valid range: from 1
1139 ``V4L2_CID_MPEG_VIDEO_H263_B_FRAME_QP (integer)``
1140 Quantization parameter for an B frame for H263. Valid range: from 1
1143 ``V4L2_CID_MPEG_VIDEO_H264_I_FRAME_QP (integer)``
1144 Quantization parameter for an I frame for H264. Valid range: from 0
1147 ``V4L2_CID_MPEG_VIDEO_H264_MIN_QP (integer)``
1148 Minimum quantization parameter for H264. Valid range: from 0 to 51.
1150 ``V4L2_CID_MPEG_VIDEO_H264_MAX_QP (integer)``
1151 Maximum quantization parameter for H264. Valid range: from 0 to 51.
1153 ``V4L2_CID_MPEG_VIDEO_H264_P_FRAME_QP (integer)``
1154 Quantization parameter for an P frame for H264. Valid range: from 0
1157 ``V4L2_CID_MPEG_VIDEO_H264_B_FRAME_QP (integer)``
1158 Quantization parameter for an B frame for H264. Valid range: from 0
1161 ``V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MIN_QP (integer)``
1162 Minimum quantization parameter for the H264 I frame to limit I frame
1163 quality to a range. Valid range: from 0 to 51. If
1164 V4L2_CID_MPEG_VIDEO_H264_MIN_QP is also set, the quantization parameter
1165 should be chosen to meet both requirements.
1167 ``V4L2_CID_MPEG_VIDEO_H264_I_FRAME_MAX_QP (integer)``
1168 Maximum quantization parameter for the H264 I frame to limit I frame
1169 quality to a range. Valid range: from 0 to 51. If
1170 V4L2_CID_MPEG_VIDEO_H264_MAX_QP is also set, the quantization parameter
1171 should be chosen to meet both requirements.
1173 ``V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MIN_QP (integer)``
1174 Minimum quantization parameter for the H264 P frame to limit P frame
1175 quality to a range. Valid range: from 0 to 51. If
1176 V4L2_CID_MPEG_VIDEO_H264_MIN_QP is also set, the quantization parameter
1177 should be chosen to meet both requirements.
1179 ``V4L2_CID_MPEG_VIDEO_H264_P_FRAME_MAX_QP (integer)``
1180 Maximum quantization parameter for the H264 P frame to limit P frame
1181 quality to a range. Valid range: from 0 to 51. If
1182 V4L2_CID_MPEG_VIDEO_H264_MAX_QP is also set, the quantization parameter
1183 should be chosen to meet both requirements.
1185 ``V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP (integer)``
1186 Quantization parameter for an I frame for MPEG4. Valid range: from 1
1189 ``V4L2_CID_MPEG_VIDEO_MPEG4_MIN_QP (integer)``
1190 Minimum quantization parameter for MPEG4. Valid range: from 1 to 31.
1192 ``V4L2_CID_MPEG_VIDEO_MPEG4_MAX_QP (integer)``
1193 Maximum quantization parameter for MPEG4. Valid range: from 1 to 31.
1195 ``V4L2_CID_MPEG_VIDEO_MPEG4_P_FRAME_QP (integer)``
1196 Quantization parameter for an P frame for MPEG4. Valid range: from 1
1199 ``V4L2_CID_MPEG_VIDEO_MPEG4_B_FRAME_QP (integer)``
1200 Quantization parameter for an B frame for MPEG4. Valid range: from 1
1203 .. _v4l2-mpeg-video-vbv-size:
1205 ``V4L2_CID_MPEG_VIDEO_VBV_SIZE (integer)``
1206 The Video Buffer Verifier size in kilobytes, it is used as a
1207 limitation of frame skip. The VBV is defined in the standard as a
1208 mean to verify that the produced stream will be successfully
1209 decoded. The standard describes it as "Part of a hypothetical
1210 decoder that is conceptually connected to the output of the encoder.
1211 Its purpose is to provide a constraint on the variability of the
1212 data rate that an encoder or editing process may produce.".
1213 Applicable to the MPEG1, MPEG2, MPEG4 encoders.
1215 .. _v4l2-mpeg-video-vbv-delay:
1217 ``V4L2_CID_MPEG_VIDEO_VBV_DELAY (integer)``
1218 Sets the initial delay in milliseconds for VBV buffer control.
1220 .. _v4l2-mpeg-video-hor-search-range:
1222 ``V4L2_CID_MPEG_VIDEO_MV_H_SEARCH_RANGE (integer)``
1223 Horizontal search range defines maximum horizontal search area in
1224 pixels to search and match for the present Macroblock (MB) in the
1225 reference picture. This V4L2 control macro is used to set horizontal
1226 search range for motion estimation module in video encoder.
1228 .. _v4l2-mpeg-video-vert-search-range:
1230 ``V4L2_CID_MPEG_VIDEO_MV_V_SEARCH_RANGE (integer)``
1231 Vertical search range defines maximum vertical search area in pixels
1232 to search and match for the present Macroblock (MB) in the reference
1233 picture. This V4L2 control macro is used to set vertical search
1234 range for motion estimation module in video encoder.
1236 .. _v4l2-mpeg-video-force-key-frame:
1238 ``V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME (button)``
1239 Force a key frame for the next queued buffer. Applicable to
1240 encoders. This is a general, codec-agnostic keyframe control.
1242 .. _v4l2-mpeg-video-h264-cpb-size:
1244 ``V4L2_CID_MPEG_VIDEO_H264_CPB_SIZE (integer)``
1245 The Coded Picture Buffer size in kilobytes, it is used as a
1246 limitation of frame skip. The CPB is defined in the H264 standard as
1247 a mean to verify that the produced stream will be successfully
1248 decoded. Applicable to the H264 encoder.
1250 ``V4L2_CID_MPEG_VIDEO_H264_I_PERIOD (integer)``
1251 Period between I-frames in the open GOP for H264. In case of an open
1252 GOP this is the period between two I-frames. The period between IDR
1253 (Instantaneous Decoding Refresh) frames is taken from the GOP_SIZE
1254 control. An IDR frame, which stands for Instantaneous Decoding
1255 Refresh is an I-frame after which no prior frames are referenced.
1256 This means that a stream can be restarted from an IDR frame without
1257 the need to store or decode any previous frames. Applicable to the
1260 .. _v4l2-mpeg-video-header-mode:
1262 ``V4L2_CID_MPEG_VIDEO_HEADER_MODE``
1265 enum v4l2_mpeg_video_header_mode -
1266 Determines whether the header is returned as the first buffer or is
1267 it returned together with the first frame. Applicable to encoders.
1268 Possible values are:
1274 .. tabularcolumns:: |p{10.3cm}|p{7.2cm}|
1280 * - ``V4L2_MPEG_VIDEO_HEADER_MODE_SEPARATE``
1281 - The stream header is returned separately in the first buffer.
1282 * - ``V4L2_MPEG_VIDEO_HEADER_MODE_JOINED_WITH_1ST_FRAME``
1283 - The stream header is returned together with the first encoded
1291 ``V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER (boolean)``
1292 Repeat the video sequence headers. Repeating these headers makes
1293 random access to the video stream easier. Applicable to the MPEG1, 2
1296 ``V4L2_CID_MPEG_VIDEO_DECODER_MPEG4_DEBLOCK_FILTER (boolean)``
1297 Enabled the deblocking post processing filter for MPEG4 decoder.
1298 Applicable to the MPEG4 decoder.
1300 ``V4L2_CID_MPEG_VIDEO_MPEG4_VOP_TIME_RES (integer)``
1301 vop_time_increment_resolution value for MPEG4. Applicable to the
1304 ``V4L2_CID_MPEG_VIDEO_MPEG4_VOP_TIME_INC (integer)``
1305 vop_time_increment value for MPEG4. Applicable to the MPEG4
1308 ``V4L2_CID_MPEG_VIDEO_H264_SEI_FRAME_PACKING (boolean)``
1309 Enable generation of frame packing supplemental enhancement
1310 information in the encoded bitstream. The frame packing SEI message
1311 contains the arrangement of L and R planes for 3D viewing.
1312 Applicable to the H264 encoder.
1314 ``V4L2_CID_MPEG_VIDEO_H264_SEI_FP_CURRENT_FRAME_0 (boolean)``
1315 Sets current frame as frame0 in frame packing SEI. Applicable to the
1318 .. _v4l2-mpeg-video-h264-sei-fp-arrangement-type:
1320 ``V4L2_CID_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE``
1323 enum v4l2_mpeg_video_h264_sei_fp_arrangement_type -
1324 Frame packing arrangement type for H264 SEI. Applicable to the H264
1325 encoder. Possible values are:
1331 .. tabularcolumns:: |p{12cm}|p{5.5cm}|
1337 * - ``V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_CHEKERBOARD``
1338 - Pixels are alternatively from L and R.
1339 * - ``V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_COLUMN``
1340 - L and R are interlaced by column.
1341 * - ``V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_ROW``
1342 - L and R are interlaced by row.
1343 * - ``V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_SIDE_BY_SIDE``
1344 - L is on the left, R on the right.
1345 * - ``V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_TOP_BOTTOM``
1346 - L is on top, R on bottom.
1347 * - ``V4L2_MPEG_VIDEO_H264_SEI_FP_ARRANGEMENT_TYPE_TEMPORAL``
1348 - One view per frame.
1356 ``V4L2_CID_MPEG_VIDEO_H264_FMO (boolean)``
1357 Enables flexible macroblock ordering in the encoded bitstream. It is
1358 a technique used for restructuring the ordering of macroblocks in
1359 pictures. Applicable to the H264 encoder.
1361 .. _v4l2-mpeg-video-h264-fmo-map-type:
1363 ``V4L2_CID_MPEG_VIDEO_H264_FMO_MAP_TYPE``
1366 enum v4l2_mpeg_video_h264_fmo_map_type -
1367 When using FMO, the map type divides the image in different scan
1368 patterns of macroblocks. Applicable to the H264 encoder. Possible
1375 .. tabularcolumns:: |p{12.5cm}|p{5.0cm}|
1381 * - ``V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_INTERLEAVED_SLICES``
1382 - Slices are interleaved one after other with macroblocks in run
1384 * - ``V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_SCATTERED_SLICES``
1385 - Scatters the macroblocks based on a mathematical function known to
1386 both encoder and decoder.
1387 * - ``V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_FOREGROUND_WITH_LEFT_OVER``
1388 - Macroblocks arranged in rectangular areas or regions of interest.
1389 * - ``V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_BOX_OUT``
1390 - Slice groups grow in a cyclic way from centre to outwards.
1391 * - ``V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_RASTER_SCAN``
1392 - Slice groups grow in raster scan pattern from left to right.
1393 * - ``V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_WIPE_SCAN``
1394 - Slice groups grow in wipe scan pattern from top to bottom.
1395 * - ``V4L2_MPEG_VIDEO_H264_FMO_MAP_TYPE_EXPLICIT``
1396 - User defined map type.
1404 ``V4L2_CID_MPEG_VIDEO_H264_FMO_SLICE_GROUP (integer)``
1405 Number of slice groups in FMO. Applicable to the H264 encoder.
1407 .. _v4l2-mpeg-video-h264-fmo-change-direction:
1409 ``V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_DIRECTION``
1412 enum v4l2_mpeg_video_h264_fmo_change_dir -
1413 Specifies a direction of the slice group change for raster and wipe
1414 maps. Applicable to the H264 encoder. Possible values are:
1422 * - ``V4L2_MPEG_VIDEO_H264_FMO_CHANGE_DIR_RIGHT``
1423 - Raster scan or wipe right.
1424 * - ``V4L2_MPEG_VIDEO_H264_FMO_CHANGE_DIR_LEFT``
1425 - Reverse raster scan or wipe left.
1429 ``V4L2_CID_MPEG_VIDEO_H264_FMO_CHANGE_RATE (integer)``
1430 Specifies the size of the first slice group for raster and wipe map.
1431 Applicable to the H264 encoder.
1433 ``V4L2_CID_MPEG_VIDEO_H264_FMO_RUN_LENGTH (integer)``
1434 Specifies the number of consecutive macroblocks for the interleaved
1435 map. Applicable to the H264 encoder.
1437 ``V4L2_CID_MPEG_VIDEO_H264_ASO (boolean)``
1438 Enables arbitrary slice ordering in encoded bitstream. Applicable to
1441 ``V4L2_CID_MPEG_VIDEO_H264_ASO_SLICE_ORDER (integer)``
1442 Specifies the slice order in ASO. Applicable to the H264 encoder.
1443 The supplied 32-bit integer is interpreted as follows (bit 0 = least
1455 - Slice position or order
1459 ``V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING (boolean)``
1460 Enables H264 hierarchical coding. Applicable to the H264 encoder.
1462 .. _v4l2-mpeg-video-h264-hierarchical-coding-type:
1464 ``V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_TYPE``
1467 enum v4l2_mpeg_video_h264_hierarchical_coding_type -
1468 Specifies the hierarchical coding type. Applicable to the H264
1469 encoder. Possible values are:
1477 * - ``V4L2_MPEG_VIDEO_H264_HIERARCHICAL_CODING_B``
1478 - Hierarchical B coding.
1479 * - ``V4L2_MPEG_VIDEO_H264_HIERARCHICAL_CODING_P``
1480 - Hierarchical P coding.
1484 ``V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER (integer)``
1485 Specifies the number of hierarchical coding layers. Applicable to
1488 ``V4L2_CID_MPEG_VIDEO_H264_HIERARCHICAL_CODING_LAYER_QP (integer)``
1489 Specifies a user defined QP for each layer. Applicable to the H264
1490 encoder. The supplied 32-bit integer is interpreted as follows (bit
1491 0 = least significant bit):
1505 .. _v4l2-mpeg-mpeg2:
1507 ``V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS (struct)``
1508 Specifies the slice parameters (as extracted from the bitstream) for the
1509 associated MPEG-2 slice data. This includes the necessary parameters for
1510 configuring a stateless hardware decoding pipeline for MPEG-2.
1511 The bitstream parameters are defined according to :ref:`mpeg2part2`.
1515 This compound control is not yet part of the public kernel API and
1516 it is expected to change.
1518 .. c:type:: v4l2_ctrl_mpeg2_slice_params
1520 .. cssclass:: longtable
1522 .. tabularcolumns:: |p{5.8cm}|p{4.8cm}|p{6.6cm}|
1524 .. flat-table:: struct v4l2_ctrl_mpeg2_slice_params
1531 - Size (in bits) of the current slice data.
1533 - ``data_bit_offset``
1534 - Offset (in bits) to the video data in the current slice data.
1535 * - struct :c:type:`v4l2_mpeg2_sequence`
1537 - Structure with MPEG-2 sequence metadata, merging relevant fields from
1538 the sequence header and sequence extension parts of the bitstream.
1539 * - struct :c:type:`v4l2_mpeg2_picture`
1541 - Structure with MPEG-2 picture metadata, merging relevant fields from
1542 the picture header and picture coding extension parts of the bitstream.
1544 - ``backward_ref_ts``
1545 - Timestamp of the V4L2 capture buffer to use as backward reference, used
1546 with B-coded and P-coded frames. The timestamp refers to the
1547 ``timestamp`` field in struct :c:type:`v4l2_buffer`. Use the
1548 :c:func:`v4l2_timeval_to_ns()` function to convert the struct
1549 :c:type:`timeval` in struct :c:type:`v4l2_buffer` to a __u64.
1551 - ``forward_ref_ts``
1552 - Timestamp for the V4L2 capture buffer to use as forward reference, used
1553 with B-coded frames. The timestamp refers to the ``timestamp`` field in
1554 struct :c:type:`v4l2_buffer`. Use the :c:func:`v4l2_timeval_to_ns()`
1555 function to convert the struct :c:type:`timeval` in struct
1556 :c:type:`v4l2_buffer` to a __u64.
1558 - ``quantiser_scale_code``
1559 - Code used to determine the quantization scale to use for the IDCT.
1561 .. c:type:: v4l2_mpeg2_sequence
1563 .. cssclass:: longtable
1565 .. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
1567 .. flat-table:: struct v4l2_mpeg2_sequence
1573 - ``horizontal_size``
1574 - The width of the displayable part of the frame's luminance component.
1577 - The height of the displayable part of the frame's luminance component.
1579 - ``vbv_buffer_size``
1580 - Used to calculate the required size of the video buffering verifier,
1581 defined (in bits) as: 16 * 1024 * vbv_buffer_size.
1583 - ``profile_and_level_indication``
1584 - The current profile and level indication as extracted from the
1587 - ``progressive_sequence``
1588 - Indication that all the frames for the sequence are progressive instead
1592 - The chrominance sub-sampling format (1: 4:2:0, 2: 4:2:2, 3: 4:4:4).
1594 .. c:type:: v4l2_mpeg2_picture
1596 .. cssclass:: longtable
1598 .. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
1600 .. flat-table:: struct v4l2_mpeg2_picture
1606 - ``picture_coding_type``
1607 - Picture coding type for the frame covered by the current slice
1608 (V4L2_MPEG2_PICTURE_CODING_TYPE_I, V4L2_MPEG2_PICTURE_CODING_TYPE_P or
1609 V4L2_MPEG2_PICTURE_CODING_TYPE_B).
1612 - Motion vector codes.
1614 - ``intra_dc_precision``
1615 - Precision of Discrete Cosine transform (0: 8 bits precision,
1616 1: 9 bits precision, 2: 10 bits precision, 3: 11 bits precision).
1618 - ``picture_structure``
1619 - Picture structure (1: interlaced top field, 2: interlaced bottom field,
1620 3: progressive frame).
1622 - ``top_field_first``
1623 - If set to 1 and interlaced stream, top field is output first.
1625 - ``frame_pred_frame_dct``
1626 - If set to 1, only frame-DCT and frame prediction are used.
1628 - ``concealment_motion_vectors``
1629 - If set to 1, motion vectors are coded for intra macroblocks.
1632 - This flag affects the inverse quantization process.
1634 - ``intra_vlc_format``
1635 - This flag affects the decoding of transform coefficient data.
1637 - ``alternate_scan``
1638 - This flag affects the decoding of transform coefficient data.
1640 - ``repeat_first_field``
1641 - This flag affects the decoding process of progressive frames.
1643 - ``progressive_frame``
1644 - Indicates whether the current frame is progressive.
1646 ``V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION (struct)``
1647 Specifies quantization matrices (as extracted from the bitstream) for the
1648 associated MPEG-2 slice data.
1652 This compound control is not yet part of the public kernel API and
1653 it is expected to change.
1655 .. c:type:: v4l2_ctrl_mpeg2_quantization
1657 .. cssclass:: longtable
1659 .. tabularcolumns:: |p{1.2cm}|p{8.0cm}|p{7.4cm}|
1665 .. flat-table:: struct v4l2_ctrl_mpeg2_quantization
1671 - ``load_intra_quantiser_matrix``
1672 - One bit to indicate whether to load the ``intra_quantiser_matrix`` data.
1674 - ``load_non_intra_quantiser_matrix``
1675 - One bit to indicate whether to load the ``non_intra_quantiser_matrix``
1678 - ``load_chroma_intra_quantiser_matrix``
1679 - One bit to indicate whether to load the
1680 ``chroma_intra_quantiser_matrix`` data, only relevant for non-4:2:0 YUV
1683 - ``load_chroma_non_intra_quantiser_matrix``
1684 - One bit to indicate whether to load the
1685 ``chroma_non_intra_quantiser_matrix`` data, only relevant for non-4:2:0
1688 - ``intra_quantiser_matrix[64]``
1689 - The quantization matrix coefficients for intra-coded frames, in zigzag
1690 scanning order. It is relevant for both luma and chroma components,
1691 although it can be superseded by the chroma-specific matrix for
1692 non-4:2:0 YUV formats.
1694 - ``non_intra_quantiser_matrix[64]``
1695 - The quantization matrix coefficients for non-intra-coded frames, in
1696 zigzag scanning order. It is relevant for both luma and chroma
1697 components, although it can be superseded by the chroma-specific matrix
1698 for non-4:2:0 YUV formats.
1700 - ``chroma_intra_quantiser_matrix[64]``
1701 - The quantization matrix coefficients for the chominance component of
1702 intra-coded frames, in zigzag scanning order. Only relevant for
1703 non-4:2:0 YUV formats.
1705 - ``chroma_non_intra_quantiser_matrix[64]``
1706 - The quantization matrix coefficients for the chrominance component of
1707 non-intra-coded frames, in zigzag scanning order. Only relevant for
1708 non-4:2:0 YUV formats.
1710 ``V4L2_CID_FWHT_I_FRAME_QP (integer)``
1711 Quantization parameter for an I frame for FWHT. Valid range: from 1
1714 ``V4L2_CID_FWHT_P_FRAME_QP (integer)``
1715 Quantization parameter for a P frame for FWHT. Valid range: from 1
1720 ``V4L2_CID_MPEG_VIDEO_VP8_FRAME_HEADER (struct)``
1721 Specifies the frame parameters for the associated VP8 parsed frame data.
1722 This includes the necessary parameters for
1723 configuring a stateless hardware decoding pipeline for VP8.
1724 The bitstream parameters are defined according to :ref:`vp8`.
1728 This compound control is not yet part of the public kernel API and
1729 it is expected to change.
1731 .. c:type:: v4l2_ctrl_vp8_frame_header
1733 .. cssclass:: longtable
1735 .. tabularcolumns:: |p{5.8cm}|p{4.8cm}|p{6.6cm}|
1737 .. flat-table:: struct v4l2_ctrl_vp8_frame_header
1742 * - struct :c:type:`v4l2_vp8_segment_header`
1743 - ``segment_header``
1744 - Structure with segment-based adjustments metadata.
1745 * - struct :c:type:`v4l2_vp8_loopfilter_header`
1746 - ``loopfilter_header``
1747 - Structure with loop filter level adjustments metadata.
1748 * - struct :c:type:`v4l2_vp8_quantization_header`
1750 - Structure with VP8 dequantization indices metadata.
1751 * - struct :c:type:`v4l2_vp8_entropy_header`
1752 - ``entropy_header``
1753 - Structure with VP8 entropy coder probabilities metadata.
1754 * - struct :c:type:`v4l2_vp8_entropy_coder_state`
1756 - Structure with VP8 entropy coder state.
1759 - The width of the frame. Must be set for all frames.
1762 - The height of the frame. Must be set for all frames.
1764 - ``horizontal_scale``
1765 - Horizontal scaling factor.
1767 - ``vertical_scaling factor``
1771 - Bitstream version.
1773 - ``prob_skip_false``
1774 - Indicates the probability that the macroblock is not skipped.
1777 - Indicates the probability that a macroblock is intra-predicted.
1780 - Indicates the probability that the last reference frame is used
1781 for inter-prediction
1784 - Indicates the probability that the golden reference frame is used
1785 for inter-prediction
1788 - Number of DCT coefficients partitions. Must be one of: 1, 2, 4, or 8.
1790 - ``first_part_size``
1791 - Size of the first partition, i.e. the control partition.
1793 - ``first_part_header_bits``
1794 - Size in bits of the first partition header portion.
1796 - ``dct_part_sizes[8]``
1797 - DCT coefficients sizes.
1800 - Timestamp for the V4L2 capture buffer to use as last reference frame, used
1801 with inter-coded frames. The timestamp refers to the ``timestamp`` field in
1802 struct :c:type:`v4l2_buffer`. Use the :c:func:`v4l2_timeval_to_ns()`
1803 function to convert the struct :c:type:`timeval` in struct
1804 :c:type:`v4l2_buffer` to a __u64.
1806 - ``golden_frame_ts``
1807 - Timestamp for the V4L2 capture buffer to use as last reference frame, used
1808 with inter-coded frames. The timestamp refers to the ``timestamp`` field in
1809 struct :c:type:`v4l2_buffer`. Use the :c:func:`v4l2_timeval_to_ns()`
1810 function to convert the struct :c:type:`timeval` in struct
1811 :c:type:`v4l2_buffer` to a __u64.
1814 - Timestamp for the V4L2 capture buffer to use as alternate reference frame, used
1815 with inter-coded frames. The timestamp refers to the ``timestamp`` field in
1816 struct :c:type:`v4l2_buffer`. Use the :c:func:`v4l2_timeval_to_ns()`
1817 function to convert the struct :c:type:`timeval` in struct
1818 :c:type:`v4l2_buffer` to a __u64.
1821 - See :ref:`Frame Header Flags <vp8_frame_header_flags>`
1823 .. _vp8_frame_header_flags:
1825 ``Frame Header Flags``
1827 .. cssclass:: longtable
1834 * - ``V4L2_VP8_FRAME_HEADER_FLAG_KEY_FRAME``
1836 - Indicates if the frame is a key frame.
1837 * - ``V4L2_VP8_FRAME_HEADER_FLAG_EXPERIMENTAL``
1839 - Experimental bitstream.
1840 * - ``V4L2_VP8_FRAME_HEADER_FLAG_SHOW_FRAME``
1842 - Show frame flag, indicates if the frame is for display.
1843 * - ``V4L2_VP8_FRAME_HEADER_FLAG_MB_NO_SKIP_COEFF``
1845 - Enable/disable skipping of macroblocks with no non-zero coefficients.
1846 * - ``V4L2_VP8_FRAME_HEADER_FLAG_SIGN_BIAS_GOLDEN``
1848 - Sign of motion vectors when the golden frame is referenced.
1849 * - ``V4L2_VP8_FRAME_HEADER_FLAG_SIGN_BIAS_ALT``
1851 - Sign of motion vectors when the alt frame is referenced.
1853 .. c:type:: v4l2_vp8_entropy_coder_state
1855 .. cssclass:: longtable
1857 .. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
1859 .. flat-table:: struct v4l2_vp8_entropy_coder_state
1875 - Applications and drivers must set this to zero.
1877 .. c:type:: v4l2_vp8_segment_header
1879 .. cssclass:: longtable
1881 .. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
1883 .. flat-table:: struct v4l2_vp8_segment_header
1889 - ``quant_update[4]``
1890 - Signed quantizer value update.
1893 - Signed loop filter level value update.
1895 - ``segment_probs[3]``
1896 - Segment probabilities.
1899 - Applications and drivers must set this to zero.
1902 - See :ref:`Segment Header Flags <vp8_segment_header_flags>`
1904 .. _vp8_segment_header_flags:
1906 ``Segment Header Flags``
1908 .. cssclass:: longtable
1915 * - ``V4L2_VP8_SEGMENT_HEADER_FLAG_ENABLED``
1917 - Enable/disable segment-based adjustments.
1918 * - ``V4L2_VP8_SEGMENT_HEADER_FLAG_UPDATE_MAP``
1920 - Indicates if the macroblock segmentation map is updated in this frame.
1921 * - ``V4L2_VP8_SEGMENT_HEADER_FLAG_UPDATE_FEATURE_DATA``
1923 - Indicates if the segment feature data is updated in this frame.
1924 * - ``V4L2_VP8_SEGMENT_HEADER_FLAG_DELTA_VALUE_MODE``
1926 - If is set, the segment feature data mode is delta-value.
1927 If cleared, it's absolute-value.
1929 .. c:type:: v4l2_vp8_loopfilter_header
1931 .. cssclass:: longtable
1933 .. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
1935 .. flat-table:: struct v4l2_vp8_loopfilter_header
1941 - ``ref_frm_delta[4]``
1942 - Reference adjustment (signed) delta value.
1944 - ``mb_mode_delta[4]``
1945 - Macroblock prediction mode adjustment (signed) delta value.
1947 - ``sharpness_level``
1954 - Applications and drivers must set this to zero.
1957 - See :ref:`Loopfilter Header Flags <vp8_loopfilter_header_flags>`
1959 .. _vp8_loopfilter_header_flags:
1961 ``Loopfilter Header Flags``
1963 .. cssclass:: longtable
1970 * - ``V4L2_VP8_LF_HEADER_ADJ_ENABLE``
1972 - Enable/disable macroblock-level loop filter adjustment.
1973 * - ``V4L2_VP8_LF_HEADER_DELTA_UPDATE``
1975 - Indicates if the delta values used in an adjustment are updated.
1976 * - ``V4L2_VP8_LF_FILTER_TYPE_SIMPLE``
1978 - If set, indicates the filter type is simple.
1979 If cleared, the filter type is normal.
1981 .. c:type:: v4l2_vp8_quantization_header
1983 .. cssclass:: longtable
1985 .. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
1987 .. flat-table:: struct v4l2_vp8_quantization_header
1994 - Luma AC coefficient table index.
1997 - Luma DC delta vaue.
2000 - Y2 block DC delta value.
2003 - Y2 block AC delta value.
2006 - Chroma DC delta value.
2009 - Chroma AC delta value.
2012 - Applications and drivers must set this to zero.
2014 .. c:type:: v4l2_vp8_entropy_header
2016 .. cssclass:: longtable
2018 .. tabularcolumns:: |p{1.5cm}|p{6.3cm}|p{9.4cm}|
2020 .. flat-table:: struct v4l2_vp8_entropy_header
2026 - ``coeff_probs[4][8][3][11]``
2027 - Coefficient update probabilities.
2029 - ``y_mode_probs[4]``
2030 - Luma mode update probabilities.
2032 - ``uv_mode_probs[3]``
2033 - Chroma mode update probabilities.
2035 - ``mv_probs[2][19]``
2036 - MV decoding update probabilities.
2039 - Applications and drivers must set this to zero.
2046 MFC 5.1 MPEG Controls
2047 =====================
2049 The following MPEG class controls deal with MPEG decoding and encoding
2050 settings that are specific to the Multi Format Codec 5.1 device present
2051 in the S5P family of SoCs by Samsung.
2054 .. _mfc51-control-id:
2059 ``V4L2_CID_MPEG_MFC51_VIDEO_DECODER_H264_DISPLAY_DELAY_ENABLE (boolean)``
2060 If the display delay is enabled then the decoder is forced to return
2061 a CAPTURE buffer (decoded frame) after processing a certain number
2062 of OUTPUT buffers. The delay can be set through
2063 ``V4L2_CID_MPEG_MFC51_VIDEO_DECODER_H264_DISPLAY_DELAY``. This
2064 feature can be used for example for generating thumbnails of videos.
2065 Applicable to the H264 decoder.
2067 ``V4L2_CID_MPEG_MFC51_VIDEO_DECODER_H264_DISPLAY_DELAY (integer)``
2068 Display delay value for H264 decoder. The decoder is forced to
2069 return a decoded frame after the set 'display delay' number of
2070 frames. If this number is low it may result in frames returned out
2071 of display order, in addition the hardware may still be using the
2072 returned buffer as a reference picture for subsequent frames.
2074 ``V4L2_CID_MPEG_MFC51_VIDEO_H264_NUM_REF_PIC_FOR_P (integer)``
2075 The number of reference pictures used for encoding a P picture.
2076 Applicable to the H264 encoder.
2078 ``V4L2_CID_MPEG_MFC51_VIDEO_PADDING (boolean)``
2079 Padding enable in the encoder - use a color instead of repeating
2080 border pixels. Applicable to encoders.
2082 ``V4L2_CID_MPEG_MFC51_VIDEO_PADDING_YUV (integer)``
2083 Padding color in the encoder. Applicable to encoders. The supplied
2084 32-bit integer is interpreted as follows (bit 0 = least significant
2094 - V chrominance information
2096 - U chrominance information
2098 - Y luminance information
2104 ``V4L2_CID_MPEG_MFC51_VIDEO_RC_REACTION_COEFF (integer)``
2105 Reaction coefficient for MFC rate control. Applicable to encoders.
2109 #. Valid only when the frame level RC is enabled.
2111 #. For tight CBR, this field must be small (ex. 2 ~ 10). For
2112 VBR, this field must be large (ex. 100 ~ 1000).
2114 #. It is not recommended to use the greater number than
2115 FRAME_RATE * (10^9 / BIT_RATE).
2117 ``V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_DARK (boolean)``
2118 Adaptive rate control for dark region. Valid only when H.264 and
2119 macroblock level RC is enabled
2120 (``V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE``). Applicable to the H264
2123 ``V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_SMOOTH (boolean)``
2124 Adaptive rate control for smooth region. Valid only when H.264 and
2125 macroblock level RC is enabled
2126 (``V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE``). Applicable to the H264
2129 ``V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_STATIC (boolean)``
2130 Adaptive rate control for static region. Valid only when H.264 and
2131 macroblock level RC is enabled
2132 (``V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE``). Applicable to the H264
2135 ``V4L2_CID_MPEG_MFC51_VIDEO_H264_ADAPTIVE_RC_ACTIVITY (boolean)``
2136 Adaptive rate control for activity region. Valid only when H.264 and
2137 macroblock level RC is enabled
2138 (``V4L2_CID_MPEG_VIDEO_MB_RC_ENABLE``). Applicable to the H264
2141 .. _v4l2-mpeg-mfc51-video-frame-skip-mode:
2143 ``V4L2_CID_MPEG_MFC51_VIDEO_FRAME_SKIP_MODE``
2148 This control is deprecated. Use the standard
2149 ``V4L2_CID_MPEG_VIDEO_FRAME_SKIP_MODE`` control instead.
2151 enum v4l2_mpeg_mfc51_video_frame_skip_mode -
2152 Indicates in what conditions the encoder should skip frames. If
2153 encoding a frame would cause the encoded stream to be larger then a
2154 chosen data limit then the frame will be skipped. Possible values
2158 .. tabularcolumns:: |p{9.2cm}|p{8.3cm}|
2168 * - ``V4L2_MPEG_MFC51_FRAME_SKIP_MODE_DISABLED``
2169 - Frame skip mode is disabled.
2170 * - ``V4L2_MPEG_MFC51_FRAME_SKIP_MODE_LEVEL_LIMIT``
2171 - Frame skip mode enabled and buffer limit is set by the chosen
2172 level and is defined by the standard.
2173 * - ``V4L2_MPEG_MFC51_FRAME_SKIP_MODE_BUF_LIMIT``
2174 - Frame skip mode enabled and buffer limit is set by the VBV
2175 (MPEG1/2/4) or CPB (H264) buffer size control.
2181 ``V4L2_CID_MPEG_MFC51_VIDEO_RC_FIXED_TARGET_BIT (integer)``
2182 Enable rate-control with fixed target bit. If this setting is
2183 enabled, then the rate control logic of the encoder will calculate
2184 the average bitrate for a GOP and keep it below or equal the set
2185 bitrate target. Otherwise the rate control logic calculates the
2186 overall average bitrate for the stream and keeps it below or equal
2187 to the set bitrate. In the first case the average bitrate for the
2188 whole stream will be smaller then the set bitrate. This is caused
2189 because the average is calculated for smaller number of frames, on
2190 the other hand enabling this setting will ensure that the stream
2191 will meet tight bandwidth constraints. Applicable to encoders.
2193 .. _v4l2-mpeg-mfc51-video-force-frame-type:
2195 ``V4L2_CID_MPEG_MFC51_VIDEO_FORCE_FRAME_TYPE``
2198 enum v4l2_mpeg_mfc51_video_force_frame_type -
2199 Force a frame type for the next queued buffer. Applicable to
2200 encoders. Possible values are:
2202 .. tabularcolumns:: |p{9.5cm}|p{8.0cm}|
2208 * - ``V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_DISABLED``
2209 - Forcing a specific frame type disabled.
2210 * - ``V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_I_FRAME``
2212 * - ``V4L2_MPEG_MFC51_FORCE_FRAME_TYPE_NOT_CODED``
2213 - Force a non-coded frame.
2216 CX2341x MPEG Controls
2217 =====================
2219 The following MPEG class controls deal with MPEG encoding settings that
2220 are specific to the Conexant CX23415 and CX23416 MPEG encoding chips.
2223 .. _cx2341x-control-id:
2228 .. _v4l2-mpeg-cx2341x-video-spatial-filter-mode:
2230 ``V4L2_CID_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE``
2233 enum v4l2_mpeg_cx2341x_video_spatial_filter_mode -
2234 Sets the Spatial Filter mode (default ``MANUAL``). Possible values
2243 * - ``V4L2_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE_MANUAL``
2244 - Choose the filter manually
2245 * - ``V4L2_MPEG_CX2341X_VIDEO_SPATIAL_FILTER_MODE_AUTO``
2246 - Choose the filter automatically
2250 ``V4L2_CID_MPEG_CX2341X_VIDEO_SPATIAL_FILTER (integer (0-15))``
2251 The setting for the Spatial Filter. 0 = off, 15 = maximum. (Default
2254 .. _luma-spatial-filter-type:
2256 ``V4L2_CID_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE``
2259 enum v4l2_mpeg_cx2341x_video_luma_spatial_filter_type -
2260 Select the algorithm to use for the Luma Spatial Filter (default
2261 ``1D_HOR``). Possible values:
2263 .. tabularcolumns:: |p{14.5cm}|p{3.0cm}|
2273 * - ``V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_OFF``
2275 * - ``V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_1D_HOR``
2276 - One-dimensional horizontal
2277 * - ``V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_1D_VERT``
2278 - One-dimensional vertical
2279 * - ``V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_2D_HV_SEPARABLE``
2280 - Two-dimensional separable
2281 * - ``V4L2_MPEG_CX2341X_VIDEO_LUMA_SPATIAL_FILTER_TYPE_2D_SYM_NON_SEPARABLE``
2282 - Two-dimensional symmetrical non-separable
2290 .. _chroma-spatial-filter-type:
2292 ``V4L2_CID_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE``
2295 enum v4l2_mpeg_cx2341x_video_chroma_spatial_filter_type -
2296 Select the algorithm for the Chroma Spatial Filter (default
2297 ``1D_HOR``). Possible values are:
2300 .. tabularcolumns:: |p{14.0cm}|p{3.5cm}|
2306 * - ``V4L2_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE_OFF``
2308 * - ``V4L2_MPEG_CX2341X_VIDEO_CHROMA_SPATIAL_FILTER_TYPE_1D_HOR``
2309 - One-dimensional horizontal
2313 .. _v4l2-mpeg-cx2341x-video-temporal-filter-mode:
2315 ``V4L2_CID_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE``
2318 enum v4l2_mpeg_cx2341x_video_temporal_filter_mode -
2319 Sets the Temporal Filter mode (default ``MANUAL``). Possible values
2328 * - ``V4L2_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE_MANUAL``
2329 - Choose the filter manually
2330 * - ``V4L2_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER_MODE_AUTO``
2331 - Choose the filter automatically
2335 ``V4L2_CID_MPEG_CX2341X_VIDEO_TEMPORAL_FILTER (integer (0-31))``
2336 The setting for the Temporal Filter. 0 = off, 31 = maximum. (Default
2337 is 8 for full-scale capturing and 0 for scaled capturing.)
2339 .. _v4l2-mpeg-cx2341x-video-median-filter-type:
2341 ``V4L2_CID_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE``
2344 enum v4l2_mpeg_cx2341x_video_median_filter_type -
2345 Median Filter Type (default ``OFF``). Possible values are:
2353 * - ``V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_OFF``
2355 * - ``V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_HOR``
2357 * - ``V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_VERT``
2359 * - ``V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_HOR_VERT``
2360 - Horizontal and vertical filter
2361 * - ``V4L2_MPEG_CX2341X_VIDEO_MEDIAN_FILTER_TYPE_DIAG``
2366 ``V4L2_CID_MPEG_CX2341X_VIDEO_LUMA_MEDIAN_FILTER_BOTTOM (integer (0-255))``
2367 Threshold above which the luminance median filter is enabled
2370 ``V4L2_CID_MPEG_CX2341X_VIDEO_LUMA_MEDIAN_FILTER_TOP (integer (0-255))``
2371 Threshold below which the luminance median filter is enabled
2374 ``V4L2_CID_MPEG_CX2341X_VIDEO_CHROMA_MEDIAN_FILTER_BOTTOM (integer (0-255))``
2375 Threshold above which the chroma median filter is enabled (default
2378 ``V4L2_CID_MPEG_CX2341X_VIDEO_CHROMA_MEDIAN_FILTER_TOP (integer (0-255))``
2379 Threshold below which the chroma median filter is enabled (default
2382 ``V4L2_CID_MPEG_CX2341X_STREAM_INSERT_NAV_PACKETS (boolean)``
2383 The CX2341X MPEG encoder can insert one empty MPEG-2 PES packet into
2384 the stream between every four video frames. The packet size is 2048
2385 bytes, including the packet_start_code_prefix and stream_id
2386 fields. The stream_id is 0xBF (private stream 2). The payload
2387 consists of 0x00 bytes, to be filled in by the application. 0 = do
2388 not insert, 1 = insert packets.
2391 VPX Control Reference
2392 =====================
2394 The VPX controls include controls for encoding parameters of VPx video
2403 .. _v4l2-vpx-num-partitions:
2405 ``V4L2_CID_MPEG_VIDEO_VPX_NUM_PARTITIONS``
2408 enum v4l2_vp8_num_partitions -
2409 The number of token partitions to use in VP8 encoder. Possible
2418 * - ``V4L2_CID_MPEG_VIDEO_VPX_1_PARTITION``
2419 - 1 coefficient partition
2420 * - ``V4L2_CID_MPEG_VIDEO_VPX_2_PARTITIONS``
2421 - 2 coefficient partitions
2422 * - ``V4L2_CID_MPEG_VIDEO_VPX_4_PARTITIONS``
2423 - 4 coefficient partitions
2424 * - ``V4L2_CID_MPEG_VIDEO_VPX_8_PARTITIONS``
2425 - 8 coefficient partitions
2429 ``V4L2_CID_MPEG_VIDEO_VPX_IMD_DISABLE_4X4 (boolean)``
2430 Setting this prevents intra 4x4 mode in the intra mode decision.
2432 .. _v4l2-vpx-num-ref-frames:
2434 ``V4L2_CID_MPEG_VIDEO_VPX_NUM_REF_FRAMES``
2437 enum v4l2_vp8_num_ref_frames -
2438 The number of reference pictures for encoding P frames. Possible
2441 .. tabularcolumns:: |p{7.9cm}|p{9.6cm}|
2451 * - ``V4L2_CID_MPEG_VIDEO_VPX_1_REF_FRAME``
2452 - Last encoded frame will be searched
2453 * - ``V4L2_CID_MPEG_VIDEO_VPX_2_REF_FRAME``
2454 - Two frames will be searched among the last encoded frame, the
2455 golden frame and the alternate reference (altref) frame. The
2456 encoder implementation will decide which two are chosen.
2457 * - ``V4L2_CID_MPEG_VIDEO_VPX_3_REF_FRAME``
2458 - The last encoded frame, the golden frame and the altref frame will
2467 ``V4L2_CID_MPEG_VIDEO_VPX_FILTER_LEVEL (integer)``
2468 Indicates the loop filter level. The adjustment of the loop filter
2469 level is done via a delta value against a baseline loop filter
2472 ``V4L2_CID_MPEG_VIDEO_VPX_FILTER_SHARPNESS (integer)``
2473 This parameter affects the loop filter. Anything above zero weakens
2474 the deblocking effect on the loop filter.
2476 ``V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD (integer)``
2477 Sets the refresh period for the golden frame. The period is defined
2478 in number of frames. For a value of 'n', every nth frame starting
2479 from the first key frame will be taken as a golden frame. For eg.
2480 for encoding sequence of 0, 1, 2, 3, 4, 5, 6, 7 where the golden
2481 frame refresh period is set as 4, the frames 0, 4, 8 etc will be
2482 taken as the golden frames as frame 0 is always a key frame.
2484 .. _v4l2-vpx-golden-frame-sel:
2486 ``V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_SEL``
2489 enum v4l2_vp8_golden_frame_sel -
2490 Selects the golden frame for encoding. Possible values are:
2496 .. tabularcolumns:: |p{9.0cm}|p{8.0cm}|
2502 * - ``V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_USE_PREV``
2503 - Use the (n-2)th frame as a golden frame, current frame index being
2505 * - ``V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_USE_REF_PERIOD``
2506 - Use the previous specific frame indicated by
2507 ``V4L2_CID_MPEG_VIDEO_VPX_GOLDEN_FRAME_REF_PERIOD`` as a
2515 ``V4L2_CID_MPEG_VIDEO_VPX_MIN_QP (integer)``
2516 Minimum quantization parameter for VP8.
2518 ``V4L2_CID_MPEG_VIDEO_VPX_MAX_QP (integer)``
2519 Maximum quantization parameter for VP8.
2521 ``V4L2_CID_MPEG_VIDEO_VPX_I_FRAME_QP (integer)``
2522 Quantization parameter for an I frame for VP8.
2524 ``V4L2_CID_MPEG_VIDEO_VPX_P_FRAME_QP (integer)``
2525 Quantization parameter for a P frame for VP8.
2527 .. _v4l2-mpeg-video-vp8-profile:
2529 ``V4L2_CID_MPEG_VIDEO_VP8_PROFILE``
2532 enum v4l2_mpeg_video_vp8_profile -
2533 This control allows selecting the profile for VP8 encoder.
2534 This is also used to enumerate supported profiles by VP8 encoder or decoder.
2535 Possible values are:
2541 * - ``V4L2_MPEG_VIDEO_VP8_PROFILE_0``
2543 * - ``V4L2_MPEG_VIDEO_VP8_PROFILE_1``
2545 * - ``V4L2_MPEG_VIDEO_VP8_PROFILE_2``
2547 * - ``V4L2_MPEG_VIDEO_VP8_PROFILE_3``
2550 .. _v4l2-mpeg-video-vp9-profile:
2552 ``V4L2_CID_MPEG_VIDEO_VP9_PROFILE``
2555 enum v4l2_mpeg_video_vp9_profile -
2556 This control allows selecting the profile for VP9 encoder.
2557 This is also used to enumerate supported profiles by VP9 encoder or decoder.
2558 Possible values are:
2564 * - ``V4L2_MPEG_VIDEO_VP9_PROFILE_0``
2566 * - ``V4L2_MPEG_VIDEO_VP9_PROFILE_1``
2568 * - ``V4L2_MPEG_VIDEO_VP9_PROFILE_2``
2570 * - ``V4L2_MPEG_VIDEO_VP9_PROFILE_3``
2573 .. _v4l2-mpeg-video-vp9-level:
2575 ``V4L2_CID_MPEG_VIDEO_VP9_LEVEL (enum)``
2577 enum v4l2_mpeg_video_vp9_level -
2578 This control allows selecting the level for VP9 encoder.
2579 This is also used to enumerate supported levels by VP9 encoder or decoder.
2580 More information can be found at
2581 `webmproject <https://www.webmproject.org/vp9/levels/>`__. Possible values are:
2587 * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_1_0``
2589 * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_1_1``
2591 * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_2_0``
2593 * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_2_1``
2595 * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_3_0``
2597 * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_3_1``
2599 * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_4_0``
2601 * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_4_1``
2603 * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_5_0``
2605 * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_5_1``
2607 * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_5_2``
2609 * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_6_0``
2611 * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_6_1``
2613 * - ``V4L2_MPEG_VIDEO_VP9_LEVEL_6_2``
2617 High Efficiency Video Coding (HEVC/H.265) Control Reference
2618 ===========================================================
2620 The HEVC/H.265 controls include controls for encoding parameters of HEVC/H.265
2624 .. _hevc-control-id:
2626 HEVC/H.265 Control IDs
2627 ----------------------
2629 ``V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP (integer)``
2630 Minimum quantization parameter for HEVC.
2631 Valid range: from 0 to 51.
2633 ``V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP (integer)``
2634 Maximum quantization parameter for HEVC.
2635 Valid range: from 0 to 51.
2637 ``V4L2_CID_MPEG_VIDEO_HEVC_I_FRAME_QP (integer)``
2638 Quantization parameter for an I frame for HEVC.
2639 Valid range: [V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP,
2640 V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP].
2642 ``V4L2_CID_MPEG_VIDEO_HEVC_P_FRAME_QP (integer)``
2643 Quantization parameter for a P frame for HEVC.
2644 Valid range: [V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP,
2645 V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP].
2647 ``V4L2_CID_MPEG_VIDEO_HEVC_B_FRAME_QP (integer)``
2648 Quantization parameter for a B frame for HEVC.
2649 Valid range: [V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP,
2650 V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP].
2652 ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_QP (boolean)``
2653 HIERARCHICAL_QP allows the host to specify the quantization parameter
2654 values for each temporal layer through HIERARCHICAL_QP_LAYER. This is
2655 valid only if HIERARCHICAL_CODING_LAYER is greater than 1. Setting the
2656 control value to 1 enables setting of the QP values for the layers.
2658 .. _v4l2-hevc-hier-coding-type:
2660 ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_TYPE``
2663 enum v4l2_mpeg_video_hevc_hier_coding_type -
2664 Selects the hierarchical coding type for encoding. Possible values are:
2670 .. tabularcolumns:: |p{9.0cm}|p{8.0cm}|
2676 * - ``V4L2_MPEG_VIDEO_HEVC_HIERARCHICAL_CODING_B``
2677 - Use the B frame for hierarchical coding.
2678 * - ``V4L2_MPEG_VIDEO_HEVC_HIERARCHICAL_CODING_P``
2679 - Use the P frame for hierarchical coding.
2686 ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_LAYER (integer)``
2687 Selects the hierarchical coding layer. In normal encoding
2688 (non-hierarchial coding), it should be zero. Possible values are [0, 6].
2689 0 indicates HIERARCHICAL CODING LAYER 0, 1 indicates HIERARCHICAL CODING
2692 ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_QP (integer)``
2693 Indicates quantization parameter for hierarchical coding layer 0.
2694 Valid range: [V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP,
2695 V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP].
2697 ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_QP (integer)``
2698 Indicates quantization parameter for hierarchical coding layer 1.
2699 Valid range: [V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP,
2700 V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP].
2702 ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_QP (integer)``
2703 Indicates quantization parameter for hierarchical coding layer 2.
2704 Valid range: [V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP,
2705 V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP].
2707 ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_QP (integer)``
2708 Indicates quantization parameter for hierarchical coding layer 3.
2709 Valid range: [V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP,
2710 V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP].
2712 ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_QP (integer)``
2713 Indicates quantization parameter for hierarchical coding layer 4.
2714 Valid range: [V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP,
2715 V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP].
2717 ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_QP (integer)``
2718 Indicates quantization parameter for hierarchical coding layer 5.
2719 Valid range: [V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP,
2720 V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP].
2722 ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_QP (integer)``
2723 Indicates quantization parameter for hierarchical coding layer 6.
2724 Valid range: [V4L2_CID_MPEG_VIDEO_HEVC_MIN_QP,
2725 V4L2_CID_MPEG_VIDEO_HEVC_MAX_QP].
2727 .. _v4l2-hevc-profile:
2729 ``V4L2_CID_MPEG_VIDEO_HEVC_PROFILE``
2732 enum v4l2_mpeg_video_hevc_profile -
2733 Select the desired profile for HEVC encoder.
2739 .. tabularcolumns:: |p{9.0cm}|p{8.0cm}|
2745 * - ``V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN``
2747 * - ``V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN_STILL_PICTURE``
2748 - Main still picture profile.
2749 * - ``V4L2_MPEG_VIDEO_HEVC_PROFILE_MAIN_10``
2757 .. _v4l2-hevc-level:
2759 ``V4L2_CID_MPEG_VIDEO_HEVC_LEVEL``
2762 enum v4l2_mpeg_video_hevc_level -
2763 Selects the desired level for HEVC encoder.
2769 .. tabularcolumns:: |p{9.0cm}|p{8.0cm}|
2775 * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_1``
2777 * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_2``
2779 * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_2_1``
2781 * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_3``
2783 * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_3_1``
2785 * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_4``
2787 * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_4_1``
2789 * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_5``
2791 * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_5_1``
2793 * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_5_2``
2795 * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_6``
2797 * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_6_1``
2799 * - ``V4L2_MPEG_VIDEO_HEVC_LEVEL_6_2``
2807 ``V4L2_CID_MPEG_VIDEO_HEVC_FRAME_RATE_RESOLUTION (integer)``
2808 Indicates the number of evenly spaced subintervals, called ticks, within
2809 one second. This is a 16 bit unsigned integer and has a maximum value up to
2810 0xffff and a minimum value of 1.
2814 ``V4L2_CID_MPEG_VIDEO_HEVC_TIER``
2817 enum v4l2_mpeg_video_hevc_tier -
2818 TIER_FLAG specifies tiers information of the HEVC encoded picture. Tier
2819 were made to deal with applications that differ in terms of maximum bit
2820 rate. Setting the flag to 0 selects HEVC tier as Main tier and setting
2821 this flag to 1 indicates High tier. High tier is for applications requiring
2828 .. tabularcolumns:: |p{9.0cm}|p{8.0cm}|
2834 * - ``V4L2_MPEG_VIDEO_HEVC_TIER_MAIN``
2836 * - ``V4L2_MPEG_VIDEO_HEVC_TIER_HIGH``
2844 ``V4L2_CID_MPEG_VIDEO_HEVC_MAX_PARTITION_DEPTH (integer)``
2845 Selects HEVC maximum coding unit depth.
2847 .. _v4l2-hevc-loop-filter-mode:
2849 ``V4L2_CID_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE``
2852 enum v4l2_mpeg_video_hevc_loop_filter_mode -
2853 Loop filter mode for HEVC encoder. Possible values are:
2859 .. tabularcolumns:: |p{12.1cm}|p{5.4cm}|
2865 * - ``V4L2_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE_DISABLED``
2866 - Loop filter is disabled.
2867 * - ``V4L2_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE_ENABLED``
2868 - Loop filter is enabled.
2869 * - ``V4L2_MPEG_VIDEO_HEVC_LOOP_FILTER_MODE_DISABLED_AT_SLICE_BOUNDARY``
2870 - Loop filter is disabled at the slice boundary.
2877 ``V4L2_CID_MPEG_VIDEO_HEVC_LF_BETA_OFFSET_DIV2 (integer)``
2878 Selects HEVC loop filter beta offset. The valid range is [-6, +6].
2880 ``V4L2_CID_MPEG_VIDEO_HEVC_LF_TC_OFFSET_DIV2 (integer)``
2881 Selects HEVC loop filter tc offset. The valid range is [-6, +6].
2883 .. _v4l2-hevc-refresh-type:
2885 ``V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_TYPE``
2888 enum v4l2_mpeg_video_hevc_hier_refresh_type -
2889 Selects refresh type for HEVC encoder.
2890 Host has to specify the period into
2891 V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_PERIOD.
2897 .. tabularcolumns:: |p{8.0cm}|p{9.0cm}|
2903 * - ``V4L2_MPEG_VIDEO_HEVC_REFRESH_NONE``
2904 - Use the B frame for hierarchical coding.
2905 * - ``V4L2_MPEG_VIDEO_HEVC_REFRESH_CRA``
2906 - Use CRA (Clean Random Access Unit) picture encoding.
2907 * - ``V4L2_MPEG_VIDEO_HEVC_REFRESH_IDR``
2908 - Use IDR (Instantaneous Decoding Refresh) picture encoding.
2915 ``V4L2_CID_MPEG_VIDEO_HEVC_REFRESH_PERIOD (integer)``
2916 Selects the refresh period for HEVC encoder.
2917 This specifies the number of I pictures between two CRA/IDR pictures.
2918 This is valid only if REFRESH_TYPE is not 0.
2920 ``V4L2_CID_MPEG_VIDEO_HEVC_LOSSLESS_CU (boolean)``
2921 Indicates HEVC lossless encoding. Setting it to 0 disables lossless
2922 encoding. Setting it to 1 enables lossless encoding.
2924 ``V4L2_CID_MPEG_VIDEO_HEVC_CONST_INTRA_PRED (boolean)``
2925 Indicates constant intra prediction for HEVC encoder. Specifies the
2926 constrained intra prediction in which intra largest coding unit (LCU)
2927 prediction is performed by using residual data and decoded samples of
2928 neighboring intra LCU only. Setting the value to 1 enables constant intra
2929 prediction and setting the value to 0 disables constant intra prediction.
2931 ``V4L2_CID_MPEG_VIDEO_HEVC_WAVEFRONT (boolean)``
2932 Indicates wavefront parallel processing for HEVC encoder. Setting it to 0
2933 disables the feature and setting it to 1 enables the wavefront parallel
2936 ``V4L2_CID_MPEG_VIDEO_HEVC_GENERAL_PB (boolean)``
2937 Setting the value to 1 enables combination of P and B frame for HEVC
2940 ``V4L2_CID_MPEG_VIDEO_HEVC_TEMPORAL_ID (boolean)``
2941 Indicates temporal identifier for HEVC encoder which is enabled by
2942 setting the value to 1.
2944 ``V4L2_CID_MPEG_VIDEO_HEVC_STRONG_SMOOTHING (boolean)``
2945 Indicates bi-linear interpolation is conditionally used in the intra
2946 prediction filtering process in the CVS when set to 1. Indicates bi-linear
2947 interpolation is not used in the CVS when set to 0.
2949 ``V4L2_CID_MPEG_VIDEO_HEVC_MAX_NUM_MERGE_MV_MINUS1 (integer)``
2950 Indicates maximum number of merge candidate motion vectors.
2951 Values are from 0 to 4.
2953 ``V4L2_CID_MPEG_VIDEO_HEVC_TMV_PREDICTION (boolean)``
2954 Indicates temporal motion vector prediction for HEVC encoder. Setting it to
2955 1 enables the prediction. Setting it to 0 disables the prediction.
2957 ``V4L2_CID_MPEG_VIDEO_HEVC_WITHOUT_STARTCODE (boolean)``
2958 Specifies if HEVC generates a stream with a size of the length field
2959 instead of start code pattern. The size of the length field is configurable
2960 through the V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD control. Setting
2961 the value to 0 disables encoding without startcode pattern. Setting the
2962 value to 1 will enables encoding without startcode pattern.
2964 .. _v4l2-hevc-size-of-length-field:
2966 ``V4L2_CID_MPEG_VIDEO_HEVC_SIZE_OF_LENGTH_FIELD``
2969 enum v4l2_mpeg_video_hevc_size_of_length_field -
2970 Indicates the size of length field.
2971 This is valid when encoding WITHOUT_STARTCODE_ENABLE is enabled.
2977 .. tabularcolumns:: |p{6.0cm}|p{11.0cm}|
2983 * - ``V4L2_MPEG_VIDEO_HEVC_SIZE_0``
2984 - Generate start code pattern (Normal).
2985 * - ``V4L2_MPEG_VIDEO_HEVC_SIZE_1``
2986 - Generate size of length field instead of start code pattern and length is 1.
2987 * - ``V4L2_MPEG_VIDEO_HEVC_SIZE_2``
2988 - Generate size of length field instead of start code pattern and length is 2.
2989 * - ``V4L2_MPEG_VIDEO_HEVC_SIZE_4``
2990 - Generate size of length field instead of start code pattern and length is 4.
2996 ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L0_BR (integer)``
2997 Indicates bit rate for hierarchical coding layer 0 for HEVC encoder.
2999 ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L1_BR (integer)``
3000 Indicates bit rate for hierarchical coding layer 1 for HEVC encoder.
3002 ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L2_BR (integer)``
3003 Indicates bit rate for hierarchical coding layer 2 for HEVC encoder.
3005 ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L3_BR (integer)``
3006 Indicates bit rate for hierarchical coding layer 3 for HEVC encoder.
3008 ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L4_BR (integer)``
3009 Indicates bit rate for hierarchical coding layer 4 for HEVC encoder.
3011 ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L5_BR (integer)``
3012 Indicates bit rate for hierarchical coding layer 5 for HEVC encoder.
3014 ``V4L2_CID_MPEG_VIDEO_HEVC_HIER_CODING_L6_BR (integer)``
3015 Indicates bit rate for hierarchical coding layer 6 for HEVC encoder.
3017 ``V4L2_CID_MPEG_VIDEO_REF_NUMBER_FOR_PFRAMES (integer)``
3018 Selects number of P reference pictures required for HEVC encoder.
3019 P-Frame can use 1 or 2 frames for reference.
3021 ``V4L2_CID_MPEG_VIDEO_PREPEND_SPSPPS_TO_IDR (integer)``
3022 Indicates whether to generate SPS and PPS at every IDR. Setting it to 0
3023 disables generating SPS and PPS at every IDR. Setting it to one enables
3024 generating SPS and PPS at every IDR.
3028 ``V4L2_CID_MPEG_VIDEO_HEVC_SPS (struct)``
3029 Specifies the Sequence Parameter Set fields (as extracted from the
3030 bitstream) for the associated HEVC slice data.
3031 These bitstream parameters are defined according to :ref:`hevc`.
3032 They are described in section 7.4.3.2 "Sequence parameter set RBSP
3033 semantics" of the specification.
3035 .. c:type:: v4l2_ctrl_hevc_sps
3037 .. cssclass:: longtable
3039 .. flat-table:: struct v4l2_ctrl_hevc_sps
3045 - ``pic_width_in_luma_samples``
3048 - ``pic_height_in_luma_samples``
3051 - ``bit_depth_luma_minus8``
3054 - ``bit_depth_chroma_minus8``
3057 - ``log2_max_pic_order_cnt_lsb_minus4``
3060 - ``sps_max_dec_pic_buffering_minus1``
3063 - ``sps_max_num_reorder_pics``
3066 - ``sps_max_latency_increase_plus1``
3069 - ``log2_min_luma_coding_block_size_minus3``
3072 - ``log2_diff_max_min_luma_coding_block_size``
3075 - ``log2_min_luma_transform_block_size_minus2``
3078 - ``log2_diff_max_min_luma_transform_block_size``
3081 - ``max_transform_hierarchy_depth_inter``
3084 - ``max_transform_hierarchy_depth_intra``
3087 - ``pcm_sample_bit_depth_luma_minus1``
3090 - ``pcm_sample_bit_depth_chroma_minus1``
3093 - ``log2_min_pcm_luma_coding_block_size_minus3``
3096 - ``log2_diff_max_min_pcm_luma_coding_block_size``
3099 - ``num_short_term_ref_pic_sets``
3102 - ``num_long_term_ref_pics_sps``
3105 - ``chroma_format_idc``
3109 - See :ref:`Sequence Parameter Set Flags <hevc_sps_flags>`
3113 ``Sequence Parameter Set Flags``
3115 .. cssclass:: longtable
3122 * - ``V4L2_HEVC_SPS_FLAG_SEPARATE_COLOUR_PLANE``
3125 * - ``V4L2_HEVC_SPS_FLAG_SCALING_LIST_ENABLED``
3128 * - ``V4L2_HEVC_SPS_FLAG_AMP_ENABLED``
3131 * - ``V4L2_HEVC_SPS_FLAG_SAMPLE_ADAPTIVE_OFFSET``
3134 * - ``V4L2_HEVC_SPS_FLAG_PCM_ENABLED``
3137 * - ``V4L2_HEVC_SPS_FLAG_PCM_LOOP_FILTER_DISABLED``
3140 * - ``V4L2_HEVC_SPS_FLAG_LONG_TERM_REF_PICS_PRESENT``
3143 * - ``V4L2_HEVC_SPS_FLAG_SPS_TEMPORAL_MVP_ENABLED``
3146 * - ``V4L2_HEVC_SPS_FLAG_STRONG_INTRA_SMOOTHING_ENABLED``
3150 ``V4L2_CID_MPEG_VIDEO_HEVC_PPS (struct)``
3151 Specifies the Picture Parameter Set fields (as extracted from the
3152 bitstream) for the associated HEVC slice data.
3153 These bitstream parameters are defined according to :ref:`hevc`.
3154 They are described in section 7.4.3.3 "Picture parameter set RBSP
3155 semantics" of the specification.
3157 .. c:type:: v4l2_ctrl_hevc_pps
3159 .. cssclass:: longtable
3161 .. flat-table:: struct v4l2_ctrl_hevc_pps
3167 - ``num_extra_slice_header_bits``
3170 - ``init_qp_minus26``
3173 - ``diff_cu_qp_delta_depth``
3176 - ``pps_cb_qp_offset``
3179 - ``pps_cr_qp_offset``
3182 - ``num_tile_columns_minus1``
3185 - ``num_tile_rows_minus1``
3188 - ``column_width_minus1[20]``
3191 - ``row_height_minus1[22]``
3194 - ``pps_beta_offset_div2``
3197 - ``pps_tc_offset_div2``
3200 - ``log2_parallel_merge_level_minus2``
3204 - Applications and drivers must set this to zero.
3207 - See :ref:`Picture Parameter Set Flags <hevc_pps_flags>`
3211 ``Picture Parameter Set Flags``
3213 .. cssclass:: longtable
3220 * - ``V4L2_HEVC_PPS_FLAG_DEPENDENT_SLICE_SEGMENT``
3223 * - ``V4L2_HEVC_PPS_FLAG_OUTPUT_FLAG_PRESENT``
3226 * - ``V4L2_HEVC_PPS_FLAG_SIGN_DATA_HIDING_ENABLED``
3229 * - ``V4L2_HEVC_PPS_FLAG_CABAC_INIT_PRESENT``
3232 * - ``V4L2_HEVC_PPS_FLAG_CONSTRAINED_INTRA_PRED``
3235 * - ``V4L2_HEVC_PPS_FLAG_TRANSFORM_SKIP_ENABLED``
3238 * - ``V4L2_HEVC_PPS_FLAG_CU_QP_DELTA_ENABLED``
3241 * - ``V4L2_HEVC_PPS_FLAG_PPS_SLICE_CHROMA_QP_OFFSETS_PRESENT``
3244 * - ``V4L2_HEVC_PPS_FLAG_WEIGHTED_PRED``
3247 * - ``V4L2_HEVC_PPS_FLAG_WEIGHTED_BIPRED``
3250 * - ``V4L2_HEVC_PPS_FLAG_TRANSQUANT_BYPASS_ENABLED``
3253 * - ``V4L2_HEVC_PPS_FLAG_TILES_ENABLED``
3256 * - ``V4L2_HEVC_PPS_FLAG_ENTROPY_CODING_SYNC_ENABLED``
3259 * - ``V4L2_HEVC_PPS_FLAG_LOOP_FILTER_ACROSS_TILES_ENABLED``
3262 * - ``V4L2_HEVC_PPS_FLAG_PPS_LOOP_FILTER_ACROSS_SLICES_ENABLED``
3265 * - ``V4L2_HEVC_PPS_FLAG_DEBLOCKING_FILTER_OVERRIDE_ENABLED``
3268 * - ``V4L2_HEVC_PPS_FLAG_PPS_DISABLE_DEBLOCKING_FILTER``
3271 * - ``V4L2_HEVC_PPS_FLAG_LISTS_MODIFICATION_PRESENT``
3274 * - ``V4L2_HEVC_PPS_FLAG_SLICE_SEGMENT_HEADER_EXTENSION_PRESENT``
3278 ``V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS (struct)``
3279 Specifies various slice-specific parameters, especially from the NAL unit
3280 header, general slice segment header and weighted prediction parameter
3281 parts of the bitstream.
3282 These bitstream parameters are defined according to :ref:`hevc`.
3283 They are described in section 7.4.7 "General slice segment header
3284 semantics" of the specification.
3286 .. c:type:: v4l2_ctrl_hevc_slice_params
3288 .. cssclass:: longtable
3290 .. flat-table:: struct v4l2_ctrl_hevc_slice_params
3297 - Size (in bits) of the current slice data.
3299 - ``data_bit_offset``
3300 - Offset (in bits) to the video data in the current slice data.
3305 - ``nuh_temporal_id_plus1``
3310 (V4L2_HEVC_SLICE_TYPE_I, V4L2_HEVC_SLICE_TYPE_P or
3311 V4L2_HEVC_SLICE_TYPE_B).
3313 - ``colour_plane_id``
3316 - ``slice_pic_order_cnt``
3319 - ``num_ref_idx_l0_active_minus1``
3322 - ``num_ref_idx_l1_active_minus1``
3325 - ``collocated_ref_idx``
3328 - ``five_minus_max_num_merge_cand``
3331 - ``slice_qp_delta``
3334 - ``slice_cb_qp_offset``
3337 - ``slice_cr_qp_offset``
3340 - ``slice_act_y_qp_offset``
3343 - ``slice_act_cb_qp_offset``
3346 - ``slice_act_cr_qp_offset``
3349 - ``slice_beta_offset_div2``
3352 - ``slice_tc_offset_div2``
3358 - ``num_active_dpb_entries``
3359 - The number of entries in ``dpb``.
3361 - ``ref_idx_l0[V4L2_HEVC_DPB_ENTRIES_NUM_MAX]``
3362 - The list of L0 reference elements as indices in the DPB.
3364 - ``ref_idx_l1[V4L2_HEVC_DPB_ENTRIES_NUM_MAX]``
3365 - The list of L1 reference elements as indices in the DPB.
3367 - ``num_rps_poc_st_curr_before``
3368 - The number of reference pictures in the short-term set that come before
3371 - ``num_rps_poc_st_curr_after``
3372 - The number of reference pictures in the short-term set that come after
3375 - ``num_rps_poc_lt_curr``
3376 - The number of reference pictures in the long-term set.
3379 - Applications and drivers must set this to zero.
3380 * - struct :c:type:`v4l2_hevc_dpb_entry`
3381 - ``dpb[V4L2_HEVC_DPB_ENTRIES_NUM_MAX]``
3382 - The decoded picture buffer, for meta-data about reference frames.
3383 * - struct :c:type:`v4l2_hevc_pred_weight_table`
3384 - ``pred_weight_table``
3385 - The prediction weight coefficients for inter-picture prediction.
3388 - See :ref:`Slice Parameters Flags <hevc_slice_params_flags>`
3390 .. _hevc_slice_params_flags:
3392 ``Slice Parameters Flags``
3394 .. cssclass:: longtable
3401 * - ``V4L2_HEVC_SLICE_PARAMS_FLAG_SLICE_SAO_LUMA``
3404 * - ``V4L2_HEVC_SLICE_PARAMS_FLAG_SLICE_SAO_CHROMA``
3407 * - ``V4L2_HEVC_SLICE_PARAMS_FLAG_SLICE_TEMPORAL_MVP_ENABLED``
3410 * - ``V4L2_HEVC_SLICE_PARAMS_FLAG_MVD_L1_ZERO``
3413 * - ``V4L2_HEVC_SLICE_PARAMS_FLAG_CABAC_INIT``
3416 * - ``V4L2_HEVC_SLICE_PARAMS_FLAG_COLLOCATED_FROM_L0``
3419 * - ``V4L2_HEVC_SLICE_PARAMS_FLAG_USE_INTEGER_MV``
3422 * - ``V4L2_HEVC_SLICE_PARAMS_FLAG_SLICE_DEBLOCKING_FILTER_DISABLED``
3425 * - ``V4L2_HEVC_SLICE_PARAMS_FLAG_SLICE_LOOP_FILTER_ACROSS_SLICES_ENABLED``
3429 .. c:type:: v4l2_hevc_dpb_entry
3431 .. cssclass:: longtable
3433 .. flat-table:: struct v4l2_hevc_dpb_entry
3440 - Timestamp of the V4L2 capture buffer to use as reference, used
3441 with B-coded and P-coded frames. The timestamp refers to the
3442 ``timestamp`` field in struct :c:type:`v4l2_buffer`. Use the
3443 :c:func:`v4l2_timeval_to_ns()` function to convert the struct
3444 :c:type:`timeval` in struct :c:type:`v4l2_buffer` to a __u64.
3447 - The reference set for the reference frame
3448 (V4L2_HEVC_DPB_ENTRY_RPS_ST_CURR_BEFORE,
3449 V4L2_HEVC_DPB_ENTRY_RPS_ST_CURR_AFTER or
3450 V4L2_HEVC_DPB_ENTRY_RPS_LT_CURR)
3453 - Whether the reference is a field picture or a frame.
3455 - ``pic_order_cnt[2]``
3456 - The picture order count of the reference. Only the first element of the
3457 array is used for frame pictures, while the first element identifies the
3458 top field and the second the bottom field in field-coded pictures.
3461 - Applications and drivers must set this to zero.
3463 .. c:type:: v4l2_hevc_pred_weight_table
3465 .. cssclass:: longtable
3467 .. flat-table:: struct v4l2_hevc_pred_weight_table
3473 - ``luma_log2_weight_denom``
3476 - ``delta_chroma_log2_weight_denom``
3479 - ``delta_luma_weight_l0[V4L2_HEVC_DPB_ENTRIES_NUM_MAX]``
3482 - ``luma_offset_l0[V4L2_HEVC_DPB_ENTRIES_NUM_MAX]``
3485 - ``delta_chroma_weight_l0[V4L2_HEVC_DPB_ENTRIES_NUM_MAX][2]``
3488 - ``chroma_offset_l0[V4L2_HEVC_DPB_ENTRIES_NUM_MAX][2]``
3491 - ``delta_luma_weight_l1[V4L2_HEVC_DPB_ENTRIES_NUM_MAX]``
3494 - ``luma_offset_l1[V4L2_HEVC_DPB_ENTRIES_NUM_MAX]``
3497 - ``delta_chroma_weight_l1[V4L2_HEVC_DPB_ENTRIES_NUM_MAX][2]``
3500 - ``chroma_offset_l1[V4L2_HEVC_DPB_ENTRIES_NUM_MAX][2]``
3504 - Applications and drivers must set this to zero.
3506 ``V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE (enum)``
3507 Specifies the decoding mode to use. Currently exposes slice-based and
3508 frame-based decoding but new modes might be added later on.
3509 This control is used as a modifier for V4L2_PIX_FMT_HEVC_SLICE
3510 pixel format. Applications that support V4L2_PIX_FMT_HEVC_SLICE
3511 are required to set this control in order to specify the decoding mode
3512 that is expected for the buffer.
3513 Drivers may expose a single or multiple decoding modes, depending
3514 on what they can support.
3518 This menu control is not yet part of the public kernel API and
3519 it is expected to change.
3521 .. c:type:: v4l2_mpeg_video_hevc_decode_mode
3523 .. cssclass:: longtable
3530 * - ``V4L2_MPEG_VIDEO_HEVC_DECODE_MODE_SLICE_BASED``
3532 - Decoding is done at the slice granularity.
3533 The OUTPUT buffer must contain a single slice.
3534 * - ``V4L2_MPEG_VIDEO_HEVC_DECODE_MODE_FRAME_BASED``
3536 - Decoding is done at the frame granularity.
3537 The OUTPUT buffer must contain all slices needed to decode the
3538 frame. The OUTPUT buffer must also contain both fields.
3540 ``V4L2_CID_MPEG_VIDEO_HEVC_START_CODE (enum)``
3541 Specifies the HEVC slice start code expected for each slice.
3542 This control is used as a modifier for V4L2_PIX_FMT_HEVC_SLICE
3543 pixel format. Applications that support V4L2_PIX_FMT_HEVC_SLICE
3544 are required to set this control in order to specify the start code
3545 that is expected for the buffer.
3546 Drivers may expose a single or multiple start codes, depending
3547 on what they can support.
3551 This menu control is not yet part of the public kernel API and
3552 it is expected to change.
3554 .. c:type:: v4l2_mpeg_video_hevc_start_code
3556 .. cssclass:: longtable
3563 * - ``V4L2_MPEG_VIDEO_HEVC_START_CODE_NONE``
3565 - Selecting this value specifies that HEVC slices are passed
3566 to the driver without any start code.
3567 * - ``V4L2_MPEG_VIDEO_HEVC_START_CODE_ANNEX_B``
3569 - Selecting this value specifies that HEVC slices are expected
3570 to be prefixed by Annex B start codes. According to :ref:`hevc`
3571 valid start codes can be 3-bytes 0x000001 or 4-bytes 0x00000001.