summaryrefslogtreecommitdiff
path: root/Documentation/userspace-api/media/dvb/fe_property_parameters.rst
blob: ecd84a8790a29c0a3db2b429342b4435ec66e492 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later

.. _fe_property_parameters:

******************************
Digital TV property parameters
******************************

There are several different Digital TV parameters that can be used by
:ref:`FE_SET_PROPERTY and FE_GET_PROPERTY ioctls<FE_GET_PROPERTY>`.
This section describes each of them. Please notice, however, that only
a subset of them are needed to setup a frontend.


.. _DTV-UNDEFINED:

DTV_UNDEFINED
=============

Used internally. A GET/SET operation for it won't change or return
anything.


.. _DTV-TUNE:

DTV_TUNE
========

Interpret the cache of data, build either a traditional frontend
tunerequest so we can pass validation in the ``FE_SET_FRONTEND`` ioctl.


.. _DTV-CLEAR:

DTV_CLEAR
=========

Reset a cache of data specific to the frontend here. This does not
effect hardware.


.. _DTV-FREQUENCY:

DTV_FREQUENCY
=============

Frequency of the digital TV transponder/channel.

.. note::

  #. For satellite delivery systems, the frequency is in kHz.

  #. For cable and terrestrial delivery systems, the frequency is in
     Hz.

  #. On most delivery systems, the frequency is the center frequency
     of the transponder/channel. The exception is for ISDB-T, where
     the main carrier has a 1/7 offset from the center.

  #. For ISDB-T, the channels are usually transmitted with an offset of
     about 143kHz. E.g. a valid frequency could be 474,143 kHz. The
     stepping is  bound to the bandwidth of the channel which is
     typically 6MHz.

  #. In ISDB-Tsb, the channel consists of only one or three segments the
     frequency step is 429kHz, 3*429 respectively.


.. _DTV-MODULATION:

DTV_MODULATION
==============

Specifies the frontend modulation type for delivery systems that
supports more multiple modulations.

The modulation can be one of the types defined by enum :c:type:`fe_modulation`.

Most of the digital TV standards offers more than one possible
modulation type.

The table below presents a summary of the types of modulation types
supported by each delivery system, as currently defined by specs.

======================= =======================================================
Standard		Modulation types
======================= =======================================================
ATSC (version 1)	8-VSB and 16-VSB.
DMTB			4-QAM, 16-QAM, 32-QAM, 64-QAM and 4-QAM-NR.
DVB-C Annex A/C		16-QAM, 32-QAM, 64-QAM and 256-QAM.
DVB-C Annex B		64-QAM.
DVB-T			QPSK, 16-QAM and 64-QAM.
DVB-T2			QPSK, 16-QAM, 64-QAM and 256-QAM.
DVB-S			No need to set. It supports only QPSK.
DVB-S2			QPSK, 8-PSK, 16-APSK and 32-APSK.
ISDB-T			QPSK, DQPSK, 16-QAM and 64-QAM.
ISDB-S			8-PSK, QPSK and BPSK.
======================= =======================================================

.. note::

   Please notice that some of the above modulation types may not be
   defined currently at the Kernel. The reason is simple: no driver
   needed such definition yet.


.. _DTV-BANDWIDTH-HZ:

DTV_BANDWIDTH_HZ
================

Bandwidth for the channel, in HZ.

Should be set only for terrestrial delivery systems.

Possible values: ``1712000``, ``5000000``, ``6000000``, ``7000000``,
``8000000``, ``10000000``.

======================= =======================================================
Terrestrial Standard	Possible values for bandwidth
======================= =======================================================
ATSC (version 1)	No need to set. It is always 6MHz.
DMTB			No need to set. It is always 8MHz.
DVB-T			6MHz, 7MHz and 8MHz.
DVB-T2			1.172 MHz, 5MHz, 6MHz, 7MHz, 8MHz and 10MHz
ISDB-T			5MHz, 6MHz, 7MHz and 8MHz, although most places
			use 6MHz.
======================= =======================================================


.. note::


  #. For ISDB-Tsb, the bandwidth can vary depending on the number of
     connected segments.

     It can be easily derived from other parameters
     (DTV_ISDBT_SB_SEGMENT_IDX, DTV_ISDBT_SB_SEGMENT_COUNT).

  #. On Satellite and Cable delivery systems, the bandwidth depends on
     the symbol rate. So, the Kernel will silently ignore any setting
     :ref:`DTV-BANDWIDTH-HZ`. I will however fill it back with a
     bandwidth estimation.

     Such bandwidth estimation takes into account the symbol rate set with
     :ref:`DTV-SYMBOL-RATE`, and the rolloff factor, with is fixed for
     DVB-C and DVB-S.

     For DVB-S2, the rolloff should also be set via :ref:`DTV-ROLLOFF`.


.. _DTV-INVERSION:

DTV_INVERSION
=============

Specifies if the frontend should do spectral inversion or not.

The acceptable values are defined by :c:type:`fe_spectral_inversion`.


.. _DTV-DISEQC-MASTER:

DTV_DISEQC_MASTER
=================

Currently not implemented.


.. _DTV-SYMBOL-RATE:

DTV_SYMBOL_RATE
===============

Used on cable and satellite delivery systems.

Digital TV symbol rate, in bauds (symbols/second).


.. _DTV-INNER-FEC:

DTV_INNER_FEC
=============

Used on cable and satellite delivery systems.

The acceptable values are defined by :c:type:`fe_code_rate`.


.. _DTV-VOLTAGE:

DTV_VOLTAGE
===========

Used on satellite delivery systems.

The voltage is usually used with non-DiSEqC capable LNBs to switch the
polarzation (horizontal/vertical). When using DiSEqC epuipment this
voltage has to be switched consistently to the DiSEqC commands as
described in the DiSEqC spec.

The acceptable values are defined by :c:type:`fe_sec_voltage`.


.. _DTV-TONE:

DTV_TONE
========

Currently not used.


.. _DTV-PILOT:

DTV_PILOT
=========

Used on DVB-S2.

Sets DVB-S2 pilot.

The acceptable values are defined by :c:type:`fe_pilot`.


.. _DTV-ROLLOFF:

DTV_ROLLOFF
===========

Used on DVB-S2.

Sets DVB-S2 rolloff.

The acceptable values are defined by :c:type:`fe_rolloff`.


.. _DTV-DISEQC-SLAVE-REPLY:

DTV_DISEQC_SLAVE_REPLY
======================

Currently not implemented.


.. _DTV-FE-CAPABILITY-COUNT:

DTV_FE_CAPABILITY_COUNT
=======================

Currently not implemented.


.. _DTV-FE-CAPABILITY:

DTV_FE_CAPABILITY
=================

Currently not implemented.


.. _DTV-DELIVERY-SYSTEM:

DTV_DELIVERY_SYSTEM
===================

Specifies the type of the delivery system.

The acceptable values are defined by :c:type:`fe_delivery_system`.


.. _DTV-ISDBT-PARTIAL-RECEPTION:

DTV_ISDBT_PARTIAL_RECEPTION
===========================

Used only on ISDB.

If ``DTV_ISDBT_SOUND_BROADCASTING`` is '0' this bit-field represents
whether the channel is in partial reception mode or not.

If '1' ``DTV_ISDBT_LAYERA_*`` values are assigned to the center segment
and ``DTV_ISDBT_LAYERA_SEGMENT_COUNT`` has to be '1'.

If in addition ``DTV_ISDBT_SOUND_BROADCASTING`` is '1'
``DTV_ISDBT_PARTIAL_RECEPTION`` represents whether this ISDB-Tsb channel
is consisting of one segment and layer or three segments and two layers.

Possible values: 0, 1, -1 (AUTO)


.. _DTV-ISDBT-SOUND-BROADCASTING:

DTV_ISDBT_SOUND_BROADCASTING
============================

Used only on ISDB.

This field represents whether the other DTV_ISDBT_*-parameters are
referring to an ISDB-T and an ISDB-Tsb channel. (See also
``DTV_ISDBT_PARTIAL_RECEPTION``).

Possible values: 0, 1, -1 (AUTO)


.. _DTV-ISDBT-SB-SUBCHANNEL-ID:

DTV_ISDBT_SB_SUBCHANNEL_ID
==========================

Used only on ISDB.

This field only applies if ``DTV_ISDBT_SOUND_BROADCASTING`` is '1'.

(Note of the author: This might not be the correct description of the
``SUBCHANNEL-ID`` in all details, but it is my understanding of the
technical background needed to program a device)

An ISDB-Tsb channel (1 or 3 segments) can be broadcasted alone or in a
set of connected ISDB-Tsb channels. In this set of channels every
channel can be received independently. The number of connected ISDB-Tsb
segment can vary, e.g. depending on the frequency spectrum bandwidth
available.

Example: Assume 8 ISDB-Tsb connected segments are broadcasted. The
broadcaster has several possibilities to put those channels in the air:
Assuming a normal 13-segment ISDB-T spectrum he can align the 8 segments
from position 1-8 to 5-13 or anything in between.

The underlying layer of segments are subchannels: each segment is
consisting of several subchannels with a predefined IDs. A sub-channel
is used to help the demodulator to synchronize on the channel.

An ISDB-T channel is always centered over all sub-channels. As for the
example above, in ISDB-Tsb it is no longer as simple as that.

``The DTV_ISDBT_SB_SUBCHANNEL_ID`` parameter is used to give the
sub-channel ID of the segment to be demodulated.

Possible values: 0 .. 41, -1 (AUTO)


.. _DTV-ISDBT-SB-SEGMENT-IDX:

DTV_ISDBT_SB_SEGMENT_IDX
========================

Used only on ISDB.

This field only applies if ``DTV_ISDBT_SOUND_BROADCASTING`` is '1'.

``DTV_ISDBT_SB_SEGMENT_IDX`` gives the index of the segment to be
demodulated for an ISDB-Tsb channel where several of them are
transmitted in the connected manner.

Possible values: 0 .. ``DTV_ISDBT_SB_SEGMENT_COUNT`` - 1

Note: This value cannot be determined by an automatic channel search.


.. _DTV-ISDBT-SB-SEGMENT-COUNT:

DTV_ISDBT_SB_SEGMENT_COUNT
==========================

Used only on ISDB.

This field only applies if ``DTV_ISDBT_SOUND_BROADCASTING`` is '1'.

``DTV_ISDBT_SB_SEGMENT_COUNT`` gives the total count of connected
ISDB-Tsb channels.

Possible values: 1 .. 13

Note: This value cannot be determined by an automatic channel search.


.. _isdb-hierq-layers:

DTV-ISDBT-LAYER[A-C] parameters
===============================

Used only on ISDB.

ISDB-T channels can be coded hierarchically. As opposed to DVB-T in
ISDB-T hierarchical layers can be decoded simultaneously. For that
reason a ISDB-T demodulator has 3 Viterbi and 3 Reed-Solomon decoders.

ISDB-T has 3 hierarchical layers which each can use a part of the
available segments. The total number of segments over all layers has to
13 in ISDB-T.

There are 3 parameter sets, for Layers A, B and C.


.. _DTV-ISDBT-LAYER-ENABLED:

DTV_ISDBT_LAYER_ENABLED
-----------------------

Used only on ISDB.

Hierarchical reception in ISDB-T is achieved by enabling or disabling
layers in the decoding process. Setting all bits of
``DTV_ISDBT_LAYER_ENABLED`` to '1' forces all layers (if applicable) to
be demodulated. This is the default.

If the channel is in the partial reception mode
(``DTV_ISDBT_PARTIAL_RECEPTION`` = 1) the central segment can be decoded
independently of the other 12 segments. In that mode layer A has to have
a ``SEGMENT_COUNT`` of 1.

In ISDB-Tsb only layer A is used, it can be 1 or 3 in ISDB-Tsb according
to ``DTV_ISDBT_PARTIAL_RECEPTION``. ``SEGMENT_COUNT`` must be filled
accordingly.

Only the values of the first 3 bits are used. Other bits will be silently ignored:

``DTV_ISDBT_LAYER_ENABLED`` bit 0: layer A enabled

``DTV_ISDBT_LAYER_ENABLED`` bit 1: layer B enabled

``DTV_ISDBT_LAYER_ENABLED`` bit 2: layer C enabled

``DTV_ISDBT_LAYER_ENABLED`` bits 3-31: unused


.. _DTV-ISDBT-LAYER-FEC:

DTV_ISDBT_LAYER[A-C]_FEC
------------------------

Used only on ISDB.

The Forward Error Correction mechanism used by a given ISDB Layer, as
defined by :c:type:`fe_code_rate`.


Possible values are: ``FEC_AUTO``, ``FEC_1_2``, ``FEC_2_3``, ``FEC_3_4``,
``FEC_5_6``, ``FEC_7_8``


.. _DTV-ISDBT-LAYER-MODULATION:

DTV_ISDBT_LAYER[A-C]_MODULATION
-------------------------------

Used only on ISDB.

The modulation used by a given ISDB Layer, as defined by
:c:type:`fe_modulation`.

Possible values are: ``QAM_AUTO``, ``QPSK``, ``QAM_16``, ``QAM_64``, ``DQPSK``

.. note::

   #. If layer C is ``DQPSK``, then layer B has to be ``DQPSK``.

   #. If layer B is ``DQPSK`` and ``DTV_ISDBT_PARTIAL_RECEPTION``\ = 0,
      then layer has to be ``DQPSK``.


.. _DTV-ISDBT-LAYER-SEGMENT-COUNT:

DTV_ISDBT_LAYER[A-C]_SEGMENT_COUNT
----------------------------------

Used only on ISDB.

Possible values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, -1 (AUTO)

Note: Truth table for ``DTV_ISDBT_SOUND_BROADCASTING`` and
``DTV_ISDBT_PARTIAL_RECEPTION`` and ``LAYER[A-C]_SEGMENT_COUNT``

.. _isdbt-layer_seg-cnt-table:

.. flat-table:: Truth table for ISDB-T Sound Broadcasting
    :header-rows:  1
    :stub-columns: 0


    -  .. row 1

       -  Partial Reception

       -  Sound Broadcasting

       -  Layer A width

       -  Layer B width

       -  Layer C width

       -  total width

    -  .. row 2

       -  0

       -  0

       -  1 .. 13

       -  1 .. 13

       -  1 .. 13

       -  13

    -  .. row 3

       -  1

       -  0

       -  1

       -  1 .. 13

       -  1 .. 13

       -  13

    -  .. row 4

       -  0

       -  1

       -  1

       -  0

       -  0

       -  1

    -  .. row 5

       -  1

       -  1

       -  1

       -  2

       -  0

       -  13



.. _DTV-ISDBT-LAYER-TIME-INTERLEAVING:

DTV_ISDBT_LAYER[A-C]_TIME_INTERLEAVING
--------------------------------------

Used only on ISDB.

Valid values: 0, 1, 2, 4, -1 (AUTO)

when DTV_ISDBT_SOUND_BROADCASTING is active, value 8 is also valid.

Note: The real time interleaving length depends on the mode (fft-size).
The values here are referring to what can be found in the
TMCC-structure, as shown in the table below.


.. c:type:: isdbt_layer_interleaving_table

.. flat-table:: ISDB-T time interleaving modes
    :header-rows:  1
    :stub-columns: 0


    -  .. row 1

       -  ``DTV_ISDBT_LAYER[A-C]_TIME_INTERLEAVING``

       -  Mode 1 (2K FFT)

       -  Mode 2 (4K FFT)

       -  Mode 3 (8K FFT)

    -  .. row 2

       -  0

       -  0

       -  0

       -  0

    -  .. row 3

       -  1

       -  4

       -  2

       -  1

    -  .. row 4

       -  2

       -  8

       -  4

       -  2

    -  .. row 5

       -  4

       -  16

       -  8

       -  4



.. _DTV-ATSCMH-FIC-VER:

DTV_ATSCMH_FIC_VER
------------------

Used only on ATSC-MH.

Version number of the FIC (Fast Information Channel) signaling data.

FIC is used for relaying information to allow rapid service acquisition
by the receiver.

Possible values: 0, 1, 2, 3, ..., 30, 31


.. _DTV-ATSCMH-PARADE-ID:

DTV_ATSCMH_PARADE_ID
--------------------

Used only on ATSC-MH.

Parade identification number

A parade is a collection of up to eight MH groups, conveying one or two
ensembles.

Possible values: 0, 1, 2, 3, ..., 126, 127


.. _DTV-ATSCMH-NOG:

DTV_ATSCMH_NOG
--------------

Used only on ATSC-MH.

Number of MH groups per MH subframe for a designated parade.

Possible values: 1, 2, 3, 4, 5, 6, 7, 8


.. _DTV-ATSCMH-TNOG:

DTV_ATSCMH_TNOG
---------------

Used only on ATSC-MH.

Total number of MH groups including all MH groups belonging to all MH
parades in one MH subframe.

Possible values: 0, 1, 2, 3, ..., 30, 31


.. _DTV-ATSCMH-SGN:

DTV_ATSCMH_SGN
--------------

Used only on ATSC-MH.

Start group number.

Possible values: 0, 1, 2, 3, ..., 14, 15


.. _DTV-ATSCMH-PRC:

DTV_ATSCMH_PRC
--------------

Used only on ATSC-MH.

Parade repetition cycle.

Possible values: 1, 2, 3, 4, 5, 6, 7, 8


.. _DTV-ATSCMH-RS-FRAME-MODE:

DTV_ATSCMH_RS_FRAME_MODE
------------------------

Used only on ATSC-MH.

Reed Solomon (RS) frame mode.

The acceptable values are defined by :c:type:`atscmh_rs_frame_mode`.


.. _DTV-ATSCMH-RS-FRAME-ENSEMBLE:

DTV_ATSCMH_RS_FRAME_ENSEMBLE
----------------------------

Used only on ATSC-MH.

Reed Solomon(RS) frame ensemble.

The acceptable values are defined by :c:type:`atscmh_rs_frame_ensemble`.


.. _DTV-ATSCMH-RS-CODE-MODE-PRI:

DTV_ATSCMH_RS_CODE_MODE_PRI
---------------------------

Used only on ATSC-MH.

Reed Solomon (RS) code mode (primary).

The acceptable values are defined by :c:type:`atscmh_rs_code_mode`.


.. _DTV-ATSCMH-RS-CODE-MODE-SEC:

DTV_ATSCMH_RS_CODE_MODE_SEC
---------------------------

Used only on ATSC-MH.

Reed Solomon (RS) code mode (secondary).

The acceptable values are defined by :c:type:`atscmh_rs_code_mode`.


.. _DTV-ATSCMH-SCCC-BLOCK-MODE:

DTV_ATSCMH_SCCC_BLOCK_MODE
--------------------------

Used only on ATSC-MH.

Series Concatenated Convolutional Code Block Mode.

The acceptable values are defined by :c:type:`atscmh_sccc_block_mode`.


.. _DTV-ATSCMH-SCCC-CODE-MODE-A:

DTV_ATSCMH_SCCC_CODE_MODE_A
---------------------------

Used only on ATSC-MH.

Series Concatenated Convolutional Code Rate.

The acceptable values are defined by :c:type:`atscmh_sccc_code_mode`.

.. _DTV-ATSCMH-SCCC-CODE-MODE-B:

DTV_ATSCMH_SCCC_CODE_MODE_B
---------------------------

Used only on ATSC-MH.

Series Concatenated Convolutional Code Rate.

Possible values are the same as documented on enum
:c:type:`atscmh_sccc_code_mode`.


.. _DTV-ATSCMH-SCCC-CODE-MODE-C:

DTV_ATSCMH_SCCC_CODE_MODE_C
---------------------------

Used only on ATSC-MH.

Series Concatenated Convolutional Code Rate.

Possible values are the same as documented on enum
:c:type:`atscmh_sccc_code_mode`.


.. _DTV-ATSCMH-SCCC-CODE-MODE-D:

DTV_ATSCMH_SCCC_CODE_MODE_D
---------------------------

Used only on ATSC-MH.

Series Concatenated Convolutional Code Rate.

Possible values are the same as documented on enum
:c:type:`atscmh_sccc_code_mode`.


.. _DTV-API-VERSION:

DTV_API_VERSION
===============

Returns the major/minor version of the Digital TV API


.. _DTV-CODE-RATE-HP:

DTV_CODE_RATE_HP
================

Used on terrestrial transmissions.

The acceptable values are defined by :c:type:`fe_transmit_mode`.


.. _DTV-CODE-RATE-LP:

DTV_CODE_RATE_LP
================

Used on terrestrial transmissions.

The acceptable values are defined by :c:type:`fe_transmit_mode`.


.. _DTV-GUARD-INTERVAL:

DTV_GUARD_INTERVAL
==================

The acceptable values are defined by :c:type:`fe_guard_interval`.

.. note::

   #. If ``DTV_GUARD_INTERVAL`` is set the ``GUARD_INTERVAL_AUTO`` the
      hardware will try to find the correct guard interval (if capable) and
      will use TMCC to fill in the missing parameters.
   #. Intervals ``GUARD_INTERVAL_1_128``, ``GUARD_INTERVAL_19_128``
      and ``GUARD_INTERVAL_19_256`` are used only for DVB-T2 at
      present.
   #. Intervals ``GUARD_INTERVAL_PN420``, ``GUARD_INTERVAL_PN595`` and
      ``GUARD_INTERVAL_PN945`` are used only for DMTB at the present.
      On such standard, only those intervals and ``GUARD_INTERVAL_AUTO``
      are valid.

.. _DTV-TRANSMISSION-MODE:

DTV_TRANSMISSION_MODE
=====================


Used only on OFTM-based standards, e. g. DVB-T/T2, ISDB-T, DTMB.

Specifies the FFT size (with corresponds to the approximate number of
carriers) used by the standard.

The acceptable values are defined by :c:type:`fe_transmit_mode`.

.. note::

   #. ISDB-T supports three carrier/symbol-size: 8K, 4K, 2K. It is called
      **mode** on such standard, and are numbered from 1 to 3:

      ====	========	========================
      Mode	FFT size	Transmission mode
      ====	========	========================
      1		2K		``TRANSMISSION_MODE_2K``
      2		4K		``TRANSMISSION_MODE_4K``
      3		8K		``TRANSMISSION_MODE_8K``
      ====	========	========================

   #. If ``DTV_TRANSMISSION_MODE`` is set the ``TRANSMISSION_MODE_AUTO``
      the hardware will try to find the correct FFT-size (if capable) and
      will use TMCC to fill in the missing parameters.

   #. DVB-T specifies 2K and 8K as valid sizes.

   #. DVB-T2 specifies 1K, 2K, 4K, 8K, 16K and 32K.

   #. DTMB specifies C1 and C3780.


.. _DTV-HIERARCHY:

DTV_HIERARCHY
=============

Used only on DVB-T and DVB-T2.

Frontend hierarchy.

The acceptable values are defined by :c:type:`fe_hierarchy`.


.. _DTV-STREAM-ID:

DTV_STREAM_ID
=============

Used on DVB-S2, DVB-T2 and ISDB-S.

DVB-S2, DVB-T2 and ISDB-S support the transmission of several streams on
a single transport stream. This property enables the digital TV driver to
handle substream filtering, when supported by the hardware. By default,
substream filtering is disabled.

For DVB-S2 and DVB-T2, the valid substream id range is from 0 to 255.

For ISDB, the valid substream id range is from 1 to 65535.

To disable it, you should use the special macro NO_STREAM_ID_FILTER.

Note: any value outside the id range also disables filtering.


.. _DTV-DVBT2-PLP-ID-LEGACY:

DTV_DVBT2_PLP_ID_LEGACY
=======================

Obsolete, replaced with DTV_STREAM_ID.


.. _DTV-ENUM-DELSYS:

DTV_ENUM_DELSYS
===============

A Multi standard frontend needs to advertise the delivery systems
provided. Applications need to enumerate the provided delivery systems,
before using any other operation with the frontend. Prior to it's
introduction, FE_GET_INFO was used to determine a frontend type. A
frontend which provides more than a single delivery system,
FE_GET_INFO doesn't help much. Applications which intends to use a
multistandard frontend must enumerate the delivery systems associated
with it, rather than trying to use FE_GET_INFO. In the case of a
legacy frontend, the result is just the same as with FE_GET_INFO, but
in a more structured format

The acceptable values are defined by :c:type:`fe_delivery_system`.


.. _DTV-INTERLEAVING:

DTV_INTERLEAVING
================

Time interleaving to be used.

The acceptable values are defined by :c:type:`fe_interleaving`.


.. _DTV-LNA:

DTV_LNA
=======

Low-noise amplifier.

Hardware might offer controllable LNA which can be set manually using
that parameter. Usually LNA could be found only from terrestrial devices
if at all.

Possible values: 0, 1, LNA_AUTO

0, LNA off

1, LNA on

use the special macro LNA_AUTO to set LNA auto


.. _DTV-SCRAMBLING-SEQUENCE-INDEX:

DTV_SCRAMBLING_SEQUENCE_INDEX
=============================

Used on DVB-S2.

This 18 bit field, when present, carries the index of the DVB-S2 physical
layer scrambling sequence as defined in clause 5.5.4 of EN 302 307.
There is no explicit signalling method to convey scrambling sequence index
to the receiver. If S2 satellite delivery system descriptor is available
it can be used to read the scrambling sequence index (EN 300 468 table 41).

By default, gold scrambling sequence index 0 is used.

The valid scrambling sequence index range is from 0 to 262142.