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1.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later2 3.. _fe_property_parameters:4 5******************************6Digital TV property parameters7******************************8 9There are several different Digital TV parameters that can be used by10:ref:`FE_SET_PROPERTY and FE_GET_PROPERTY ioctls<FE_GET_PROPERTY>`.11This section describes each of them. Please notice, however, that only12a subset of them are needed to setup a frontend.13 14 15.. _DTV-UNDEFINED:16 17DTV_UNDEFINED18=============19 20Used internally. A GET/SET operation for it won't change or return21anything.22 23 24.. _DTV-TUNE:25 26DTV_TUNE27========28 29Interpret the cache of data, build either a traditional frontend30tunerequest so we can pass validation in the ``FE_SET_FRONTEND`` ioctl.31 32 33.. _DTV-CLEAR:34 35DTV_CLEAR36=========37 38Reset a cache of data specific to the frontend here. This does not39effect hardware.40 41 42.. _DTV-FREQUENCY:43 44DTV_FREQUENCY45=============46 47Frequency of the digital TV transponder/channel.48 49.. note::50 51 #. For satellite delivery systems, the frequency is in kHz.52 53 #. For cable and terrestrial delivery systems, the frequency is in54 Hz.55 56 #. On most delivery systems, the frequency is the center frequency57 of the transponder/channel. The exception is for ISDB-T, where58 the main carrier has a 1/7 offset from the center.59 60 #. For ISDB-T, the channels are usually transmitted with an offset of61 about 143kHz. E.g. a valid frequency could be 474,143 kHz. The62 stepping is bound to the bandwidth of the channel which is63 typically 6MHz.64 65 #. In ISDB-Tsb, the channel consists of only one or three segments the66 frequency step is 429kHz, 3*429 respectively.67 68 69.. _DTV-MODULATION:70 71DTV_MODULATION72==============73 74Specifies the frontend modulation type for delivery systems that75supports more multiple modulations.76 77The modulation can be one of the types defined by enum :c:type:`fe_modulation`.78 79Most of the digital TV standards offers more than one possible80modulation type.81 82The table below presents a summary of the types of modulation types83supported by each delivery system, as currently defined by specs.84 85======================= =======================================================86Standard Modulation types87======================= =======================================================88ATSC (version 1) 8-VSB and 16-VSB.89DMTB 4-QAM, 16-QAM, 32-QAM, 64-QAM and 4-QAM-NR.90DVB-C Annex A/C 16-QAM, 32-QAM, 64-QAM and 256-QAM.91DVB-C Annex B 64-QAM.92DVB-C2 QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM and 4096-QAM.93DVB-T QPSK, 16-QAM and 64-QAM.94DVB-T2 QPSK, 16-QAM, 64-QAM and 256-QAM.95DVB-S No need to set. It supports only QPSK.96DVB-S2 QPSK, 8-PSK, 16-APSK and 32-APSK.97DVB-S2X 8-APSK-L, 16-APSK-L, 32-APSK-L, 64-APSK and 64-APSK-L.98ISDB-T QPSK, DQPSK, 16-QAM and 64-QAM.99ISDB-S 8-PSK, QPSK and BPSK.100======================= =======================================================101 102.. note::103 104 As DVB-S2X specifies extensions to the DVB-S2 standard, the same105 delivery system enum value is used (SYS_DVBS2).106 107 Please notice that some of the above modulation types may not be108 defined currently at the Kernel. The reason is simple: no driver109 needed such definition yet.110 111 112.. _DTV-BANDWIDTH-HZ:113 114DTV_BANDWIDTH_HZ115================116 117Bandwidth for the channel, in HZ.118 119Should be set only for terrestrial delivery systems.120 121Possible values: ``1712000``, ``5000000``, ``6000000``, ``7000000``,122``8000000``, ``10000000``.123 124======================= =======================================================125Terrestrial Standard Possible values for bandwidth126======================= =======================================================127ATSC (version 1) No need to set. It is always 6MHz.128DMTB No need to set. It is always 8MHz.129DVB-T 6MHz, 7MHz and 8MHz.130DVB-T2 1.172 MHz, 5MHz, 6MHz, 7MHz, 8MHz and 10MHz131ISDB-T 5MHz, 6MHz, 7MHz and 8MHz, although most places132 use 6MHz.133======================= =======================================================134 135 136.. note::137 138 139 #. For ISDB-Tsb, the bandwidth can vary depending on the number of140 connected segments.141 142 It can be easily derived from other parameters143 (DTV_ISDBT_SB_SEGMENT_IDX, DTV_ISDBT_SB_SEGMENT_COUNT).144 145 #. On Satellite and Cable delivery systems, the bandwidth depends on146 the symbol rate. So, the Kernel will silently ignore any setting147 :ref:`DTV-BANDWIDTH-HZ`. I will however fill it back with a148 bandwidth estimation.149 150 Such bandwidth estimation takes into account the symbol rate set with151 :ref:`DTV-SYMBOL-RATE`, and the rolloff factor, with is fixed for152 DVB-C and DVB-S.153 154 For DVB-S2, the rolloff should also be set via :ref:`DTV-ROLLOFF`.155 156 157.. _DTV-INVERSION:158 159DTV_INVERSION160=============161 162Specifies if the frontend should do spectral inversion or not.163 164The acceptable values are defined by :c:type:`fe_spectral_inversion`.165 166 167.. _DTV-DISEQC-MASTER:168 169DTV_DISEQC_MASTER170=================171 172Currently not implemented.173 174 175.. _DTV-SYMBOL-RATE:176 177DTV_SYMBOL_RATE178===============179 180Used on cable and satellite delivery systems.181 182Digital TV symbol rate, in bauds (symbols/second).183 184 185.. _DTV-INNER-FEC:186 187DTV_INNER_FEC188=============189 190Used on cable and satellite delivery systems.191 192The acceptable values are defined by :c:type:`fe_code_rate`.193 194 195.. _DTV-VOLTAGE:196 197DTV_VOLTAGE198===========199 200Used on satellite delivery systems.201 202The voltage is usually used with non-DiSEqC capable LNBs to switch the203polarzation (horizontal/vertical). When using DiSEqC epuipment this204voltage has to be switched consistently to the DiSEqC commands as205described in the DiSEqC spec.206 207The acceptable values are defined by :c:type:`fe_sec_voltage`.208 209 210.. _DTV-TONE:211 212DTV_TONE213========214 215Currently not used.216 217 218.. _DTV-PILOT:219 220DTV_PILOT221=========222 223Used on DVB-S2.224 225Sets DVB-S2 pilot.226 227The acceptable values are defined by :c:type:`fe_pilot`.228 229 230.. _DTV-ROLLOFF:231 232DTV_ROLLOFF233===========234 235Used on DVB-S2.236 237Sets DVB-S2 rolloff.238 239The acceptable values are defined by :c:type:`fe_rolloff`.240 241 242.. _DTV-DISEQC-SLAVE-REPLY:243 244DTV_DISEQC_SLAVE_REPLY245======================246 247Currently not implemented.248 249 250.. _DTV-FE-CAPABILITY-COUNT:251 252DTV_FE_CAPABILITY_COUNT253=======================254 255Currently not implemented.256 257 258.. _DTV-FE-CAPABILITY:259 260DTV_FE_CAPABILITY261=================262 263Currently not implemented.264 265 266.. _DTV-DELIVERY-SYSTEM:267 268DTV_DELIVERY_SYSTEM269===================270 271Specifies the type of the delivery system.272 273The acceptable values are defined by :c:type:`fe_delivery_system`.274 275 276.. _DTV-ISDBT-PARTIAL-RECEPTION:277 278DTV_ISDBT_PARTIAL_RECEPTION279===========================280 281Used only on ISDB.282 283If ``DTV_ISDBT_SOUND_BROADCASTING`` is '0' this bit-field represents284whether the channel is in partial reception mode or not.285 286If '1' ``DTV_ISDBT_LAYERA_*`` values are assigned to the center segment287and ``DTV_ISDBT_LAYERA_SEGMENT_COUNT`` has to be '1'.288 289If in addition ``DTV_ISDBT_SOUND_BROADCASTING`` is '1'290``DTV_ISDBT_PARTIAL_RECEPTION`` represents whether this ISDB-Tsb channel291is consisting of one segment and layer or three segments and two layers.292 293Possible values: 0, 1, -1 (AUTO)294 295 296.. _DTV-ISDBT-SOUND-BROADCASTING:297 298DTV_ISDBT_SOUND_BROADCASTING299============================300 301Used only on ISDB.302 303This field represents whether the other DTV_ISDBT_*-parameters are304referring to an ISDB-T and an ISDB-Tsb channel. (See also305``DTV_ISDBT_PARTIAL_RECEPTION``).306 307Possible values: 0, 1, -1 (AUTO)308 309 310.. _DTV-ISDBT-SB-SUBCHANNEL-ID:311 312DTV_ISDBT_SB_SUBCHANNEL_ID313==========================314 315Used only on ISDB.316 317This field only applies if ``DTV_ISDBT_SOUND_BROADCASTING`` is '1'.318 319(Note of the author: This might not be the correct description of the320``SUBCHANNEL-ID`` in all details, but it is my understanding of the321technical background needed to program a device)322 323An ISDB-Tsb channel (1 or 3 segments) can be broadcasted alone or in a324set of connected ISDB-Tsb channels. In this set of channels every325channel can be received independently. The number of connected ISDB-Tsb326segment can vary, e.g. depending on the frequency spectrum bandwidth327available.328 329Example: Assume 8 ISDB-Tsb connected segments are broadcasted. The330broadcaster has several possibilities to put those channels in the air:331Assuming a normal 13-segment ISDB-T spectrum he can align the 8 segments332from position 1-8 to 5-13 or anything in between.333 334The underlying layer of segments are subchannels: each segment is335consisting of several subchannels with a predefined IDs. A sub-channel336is used to help the demodulator to synchronize on the channel.337 338An ISDB-T channel is always centered over all sub-channels. As for the339example above, in ISDB-Tsb it is no longer as simple as that.340 341``The DTV_ISDBT_SB_SUBCHANNEL_ID`` parameter is used to give the342sub-channel ID of the segment to be demodulated.343 344Possible values: 0 .. 41, -1 (AUTO)345 346 347.. _DTV-ISDBT-SB-SEGMENT-IDX:348 349DTV_ISDBT_SB_SEGMENT_IDX350========================351 352Used only on ISDB.353 354This field only applies if ``DTV_ISDBT_SOUND_BROADCASTING`` is '1'.355 356``DTV_ISDBT_SB_SEGMENT_IDX`` gives the index of the segment to be357demodulated for an ISDB-Tsb channel where several of them are358transmitted in the connected manner.359 360Possible values: 0 .. ``DTV_ISDBT_SB_SEGMENT_COUNT`` - 1361 362Note: This value cannot be determined by an automatic channel search.363 364 365.. _DTV-ISDBT-SB-SEGMENT-COUNT:366 367DTV_ISDBT_SB_SEGMENT_COUNT368==========================369 370Used only on ISDB.371 372This field only applies if ``DTV_ISDBT_SOUND_BROADCASTING`` is '1'.373 374``DTV_ISDBT_SB_SEGMENT_COUNT`` gives the total count of connected375ISDB-Tsb channels.376 377Possible values: 1 .. 13378 379Note: This value cannot be determined by an automatic channel search.380 381 382.. _isdb-hierq-layers:383 384DTV-ISDBT-LAYER[A-C] parameters385===============================386 387Used only on ISDB.388 389ISDB-T channels can be coded hierarchically. As opposed to DVB-T in390ISDB-T hierarchical layers can be decoded simultaneously. For that391reason a ISDB-T demodulator has 3 Viterbi and 3 Reed-Solomon decoders.392 393ISDB-T has 3 hierarchical layers which each can use a part of the394available segments. The total number of segments over all layers has to39513 in ISDB-T.396 397There are 3 parameter sets, for Layers A, B and C.398 399 400.. _DTV-ISDBT-LAYER-ENABLED:401 402DTV_ISDBT_LAYER_ENABLED403-----------------------404 405Used only on ISDB.406 407Hierarchical reception in ISDB-T is achieved by enabling or disabling408layers in the decoding process. Setting all bits of409``DTV_ISDBT_LAYER_ENABLED`` to '1' forces all layers (if applicable) to410be demodulated. This is the default.411 412If the channel is in the partial reception mode413(``DTV_ISDBT_PARTIAL_RECEPTION`` = 1) the central segment can be decoded414independently of the other 12 segments. In that mode layer A has to have415a ``SEGMENT_COUNT`` of 1.416 417In ISDB-Tsb only layer A is used, it can be 1 or 3 in ISDB-Tsb according418to ``DTV_ISDBT_PARTIAL_RECEPTION``. ``SEGMENT_COUNT`` must be filled419accordingly.420 421Only the values of the first 3 bits are used. Other bits will be silently ignored:422 423``DTV_ISDBT_LAYER_ENABLED`` bit 0: layer A enabled424 425``DTV_ISDBT_LAYER_ENABLED`` bit 1: layer B enabled426 427``DTV_ISDBT_LAYER_ENABLED`` bit 2: layer C enabled428 429``DTV_ISDBT_LAYER_ENABLED`` bits 3-31: unused430 431 432.. _DTV-ISDBT-LAYER-FEC:433 434DTV_ISDBT_LAYER[A-C]_FEC435------------------------436 437Used only on ISDB.438 439The Forward Error Correction mechanism used by a given ISDB Layer, as440defined by :c:type:`fe_code_rate`.441 442 443Possible values are: ``FEC_AUTO``, ``FEC_1_2``, ``FEC_2_3``, ``FEC_3_4``,444``FEC_5_6``, ``FEC_7_8``445 446 447.. _DTV-ISDBT-LAYER-MODULATION:448 449DTV_ISDBT_LAYER[A-C]_MODULATION450-------------------------------451 452Used only on ISDB.453 454The modulation used by a given ISDB Layer, as defined by455:c:type:`fe_modulation`.456 457Possible values are: ``QAM_AUTO``, ``QPSK``, ``QAM_16``, ``QAM_64``, ``DQPSK``458 459.. note::460 461 #. If layer C is ``DQPSK``, then layer B has to be ``DQPSK``.462 463 #. If layer B is ``DQPSK`` and ``DTV_ISDBT_PARTIAL_RECEPTION``\ = 0,464 then layer has to be ``DQPSK``.465 466 467.. _DTV-ISDBT-LAYER-SEGMENT-COUNT:468 469DTV_ISDBT_LAYER[A-C]_SEGMENT_COUNT470----------------------------------471 472Used only on ISDB.473 474Possible values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, -1 (AUTO)475 476Note: Truth table for ``DTV_ISDBT_SOUND_BROADCASTING`` and477``DTV_ISDBT_PARTIAL_RECEPTION`` and ``LAYER[A-C]_SEGMENT_COUNT``478 479.. _isdbt-layer_seg-cnt-table:480 481.. flat-table:: Truth table for ISDB-T Sound Broadcasting482 :header-rows: 1483 :stub-columns: 0484 485 486 - .. row 1487 488 - Partial Reception489 490 - Sound Broadcasting491 492 - Layer A width493 494 - Layer B width495 496 - Layer C width497 498 - total width499 500 - .. row 2501 502 - 0503 504 - 0505 506 - 1 .. 13507 508 - 1 .. 13509 510 - 1 .. 13511 512 - 13513 514 - .. row 3515 516 - 1517 518 - 0519 520 - 1521 522 - 1 .. 13523 524 - 1 .. 13525 526 - 13527 528 - .. row 4529 530 - 0531 532 - 1533 534 - 1535 536 - 0537 538 - 0539 540 - 1541 542 - .. row 5543 544 - 1545 546 - 1547 548 - 1549 550 - 2551 552 - 0553 554 - 13555 556 557 558.. _DTV-ISDBT-LAYER-TIME-INTERLEAVING:559 560DTV_ISDBT_LAYER[A-C]_TIME_INTERLEAVING561--------------------------------------562 563Used only on ISDB.564 565Valid values: 0, 1, 2, 4, -1 (AUTO)566 567when DTV_ISDBT_SOUND_BROADCASTING is active, value 8 is also valid.568 569Note: The real time interleaving length depends on the mode (fft-size).570The values here are referring to what can be found in the571TMCC-structure, as shown in the table below.572 573 574.. c:type:: isdbt_layer_interleaving_table575 576.. flat-table:: ISDB-T time interleaving modes577 :header-rows: 1578 :stub-columns: 0579 580 581 - .. row 1582 583 - ``DTV_ISDBT_LAYER[A-C]_TIME_INTERLEAVING``584 585 - Mode 1 (2K FFT)586 587 - Mode 2 (4K FFT)588 589 - Mode 3 (8K FFT)590 591 - .. row 2592 593 - 0594 595 - 0596 597 - 0598 599 - 0600 601 - .. row 3602 603 - 1604 605 - 4606 607 - 2608 609 - 1610 611 - .. row 4612 613 - 2614 615 - 8616 617 - 4618 619 - 2620 621 - .. row 5622 623 - 4624 625 - 16626 627 - 8628 629 - 4630 631 632 633.. _DTV-ATSCMH-FIC-VER:634 635DTV_ATSCMH_FIC_VER636------------------637 638Used only on ATSC-MH.639 640Version number of the FIC (Fast Information Channel) signaling data.641 642FIC is used for relaying information to allow rapid service acquisition643by the receiver.644 645Possible values: 0, 1, 2, 3, ..., 30, 31646 647 648.. _DTV-ATSCMH-PARADE-ID:649 650DTV_ATSCMH_PARADE_ID651--------------------652 653Used only on ATSC-MH.654 655Parade identification number656 657A parade is a collection of up to eight MH groups, conveying one or two658ensembles.659 660Possible values: 0, 1, 2, 3, ..., 126, 127661 662 663.. _DTV-ATSCMH-NOG:664 665DTV_ATSCMH_NOG666--------------667 668Used only on ATSC-MH.669 670Number of MH groups per MH subframe for a designated parade.671 672Possible values: 1, 2, 3, 4, 5, 6, 7, 8673 674 675.. _DTV-ATSCMH-TNOG:676 677DTV_ATSCMH_TNOG678---------------679 680Used only on ATSC-MH.681 682Total number of MH groups including all MH groups belonging to all MH683parades in one MH subframe.684 685Possible values: 0, 1, 2, 3, ..., 30, 31686 687 688.. _DTV-ATSCMH-SGN:689 690DTV_ATSCMH_SGN691--------------692 693Used only on ATSC-MH.694 695Start group number.696 697Possible values: 0, 1, 2, 3, ..., 14, 15698 699 700.. _DTV-ATSCMH-PRC:701 702DTV_ATSCMH_PRC703--------------704 705Used only on ATSC-MH.706 707Parade repetition cycle.708 709Possible values: 1, 2, 3, 4, 5, 6, 7, 8710 711 712.. _DTV-ATSCMH-RS-FRAME-MODE:713 714DTV_ATSCMH_RS_FRAME_MODE715------------------------716 717Used only on ATSC-MH.718 719Reed Solomon (RS) frame mode.720 721The acceptable values are defined by :c:type:`atscmh_rs_frame_mode`.722 723 724.. _DTV-ATSCMH-RS-FRAME-ENSEMBLE:725 726DTV_ATSCMH_RS_FRAME_ENSEMBLE727----------------------------728 729Used only on ATSC-MH.730 731Reed Solomon(RS) frame ensemble.732 733The acceptable values are defined by :c:type:`atscmh_rs_frame_ensemble`.734 735 736.. _DTV-ATSCMH-RS-CODE-MODE-PRI:737 738DTV_ATSCMH_RS_CODE_MODE_PRI739---------------------------740 741Used only on ATSC-MH.742 743Reed Solomon (RS) code mode (primary).744 745The acceptable values are defined by :c:type:`atscmh_rs_code_mode`.746 747 748.. _DTV-ATSCMH-RS-CODE-MODE-SEC:749 750DTV_ATSCMH_RS_CODE_MODE_SEC751---------------------------752 753Used only on ATSC-MH.754 755Reed Solomon (RS) code mode (secondary).756 757The acceptable values are defined by :c:type:`atscmh_rs_code_mode`.758 759 760.. _DTV-ATSCMH-SCCC-BLOCK-MODE:761 762DTV_ATSCMH_SCCC_BLOCK_MODE763--------------------------764 765Used only on ATSC-MH.766 767Series Concatenated Convolutional Code Block Mode.768 769The acceptable values are defined by :c:type:`atscmh_sccc_block_mode`.770 771 772.. _DTV-ATSCMH-SCCC-CODE-MODE-A:773 774DTV_ATSCMH_SCCC_CODE_MODE_A775---------------------------776 777Used only on ATSC-MH.778 779Series Concatenated Convolutional Code Rate.780 781The acceptable values are defined by :c:type:`atscmh_sccc_code_mode`.782 783.. _DTV-ATSCMH-SCCC-CODE-MODE-B:784 785DTV_ATSCMH_SCCC_CODE_MODE_B786---------------------------787 788Used only on ATSC-MH.789 790Series Concatenated Convolutional Code Rate.791 792Possible values are the same as documented on enum793:c:type:`atscmh_sccc_code_mode`.794 795 796.. _DTV-ATSCMH-SCCC-CODE-MODE-C:797 798DTV_ATSCMH_SCCC_CODE_MODE_C799---------------------------800 801Used only on ATSC-MH.802 803Series Concatenated Convolutional Code Rate.804 805Possible values are the same as documented on enum806:c:type:`atscmh_sccc_code_mode`.807 808 809.. _DTV-ATSCMH-SCCC-CODE-MODE-D:810 811DTV_ATSCMH_SCCC_CODE_MODE_D812---------------------------813 814Used only on ATSC-MH.815 816Series Concatenated Convolutional Code Rate.817 818Possible values are the same as documented on enum819:c:type:`atscmh_sccc_code_mode`.820 821 822.. _DTV-API-VERSION:823 824DTV_API_VERSION825===============826 827Returns the major/minor version of the Digital TV API828 829 830.. _DTV-CODE-RATE-HP:831 832DTV_CODE_RATE_HP833================834 835Used on terrestrial transmissions.836 837The acceptable values are defined by :c:type:`fe_transmit_mode`.838 839 840.. _DTV-CODE-RATE-LP:841 842DTV_CODE_RATE_LP843================844 845Used on terrestrial transmissions.846 847The acceptable values are defined by :c:type:`fe_transmit_mode`.848 849 850.. _DTV-GUARD-INTERVAL:851 852DTV_GUARD_INTERVAL853==================854 855The acceptable values are defined by :c:type:`fe_guard_interval`.856 857.. note::858 859 #. If ``DTV_GUARD_INTERVAL`` is set the ``GUARD_INTERVAL_AUTO`` the860 hardware will try to find the correct guard interval (if capable) and861 will use TMCC to fill in the missing parameters.862 #. Interval ``GUARD_INTERVAL_1_64`` is used only for DVB-C2.863 #. Interval ``GUARD_INTERVAL_1_128`` is used for both DVB-C2 and DVB_T2.864 #. Intervals ``GUARD_INTERVAL_19_128`` and ``GUARD_INTERVAL_19_256`` are865 used only for DVB-T2.866 #. Intervals ``GUARD_INTERVAL_PN420``, ``GUARD_INTERVAL_PN595`` and867 ``GUARD_INTERVAL_PN945`` are used only for DMTB at the present.868 On such standard, only those intervals and ``GUARD_INTERVAL_AUTO``869 are valid.870 871.. _DTV-TRANSMISSION-MODE:872 873DTV_TRANSMISSION_MODE874=====================875 876 877Used only on OFTM-based standards, e. g. DVB-T/T2, ISDB-T, DTMB.878 879Specifies the FFT size (with corresponds to the approximate number of880carriers) used by the standard.881 882The acceptable values are defined by :c:type:`fe_transmit_mode`.883 884.. note::885 886 #. ISDB-T supports three carrier/symbol-size: 8K, 4K, 2K. It is called887 **mode** on such standard, and are numbered from 1 to 3:888 889 ==== ======== ========================890 Mode FFT size Transmission mode891 ==== ======== ========================892 1 2K ``TRANSMISSION_MODE_2K``893 2 4K ``TRANSMISSION_MODE_4K``894 3 8K ``TRANSMISSION_MODE_8K``895 ==== ======== ========================896 897 #. If ``DTV_TRANSMISSION_MODE`` is set the ``TRANSMISSION_MODE_AUTO``898 the hardware will try to find the correct FFT-size (if capable) and899 will use TMCC to fill in the missing parameters.900 901 #. DVB-T specifies 2K and 8K as valid sizes.902 903 #. DVB-T2 specifies 1K, 2K, 4K, 8K, 16K and 32K.904 905 #. DTMB specifies C1 and C3780.906 907 908.. _DTV-HIERARCHY:909 910DTV_HIERARCHY911=============912 913Used only on DVB-T and DVB-T2.914 915Frontend hierarchy.916 917The acceptable values are defined by :c:type:`fe_hierarchy`.918 919 920.. _DTV-STREAM-ID:921 922DTV_STREAM_ID923=============924 925Used on DVB-C2, DVB-S2, DVB-T2 and ISDB-S.926 927DVB-C2, DVB-S2, DVB-T2 and ISDB-S support the transmission of several928streams on a single transport stream. This property enables the digital929TV driver to handle substream filtering, when supported by the hardware.930By default, substream filtering is disabled.931 932For DVB-C2, DVB-S2 and DVB-T2, the valid substream id range is from 0 to933255.934 935For ISDB, the valid substream id range is from 1 to 65535.936 937To disable it, you should use the special macro NO_STREAM_ID_FILTER.938 939Note: any value outside the id range also disables filtering.940 941 942.. _DTV-DVBT2-PLP-ID-LEGACY:943 944DTV_DVBT2_PLP_ID_LEGACY945=======================946 947Obsolete, replaced with DTV_STREAM_ID.948 949 950.. _DTV-ENUM-DELSYS:951 952DTV_ENUM_DELSYS953===============954 955A Multi standard frontend needs to advertise the delivery systems956provided. Applications need to enumerate the provided delivery systems,957before using any other operation with the frontend. Prior to it's958introduction, FE_GET_INFO was used to determine a frontend type. A959frontend which provides more than a single delivery system,960FE_GET_INFO doesn't help much. Applications which intends to use a961multistandard frontend must enumerate the delivery systems associated962with it, rather than trying to use FE_GET_INFO. In the case of a963legacy frontend, the result is just the same as with FE_GET_INFO, but964in a more structured format965 966The acceptable values are defined by :c:type:`fe_delivery_system`.967 968 969.. _DTV-INTERLEAVING:970 971DTV_INTERLEAVING972================973 974Time interleaving to be used.975 976The acceptable values are defined by :c:type:`fe_interleaving`.977 978 979.. _DTV-LNA:980 981DTV_LNA982=======983 984Low-noise amplifier.985 986Hardware might offer controllable LNA which can be set manually using987that parameter. Usually LNA could be found only from terrestrial devices988if at all.989 990Possible values: 0, 1, LNA_AUTO991 9920, LNA off993 9941, LNA on995 996use the special macro LNA_AUTO to set LNA auto997 998 999.. _DTV-SCRAMBLING-SEQUENCE-INDEX:1000 1001DTV_SCRAMBLING_SEQUENCE_INDEX1002=============================1003 1004Used on DVB-S2.1005 1006This 18 bit field, when present, carries the index of the DVB-S2 physical1007layer scrambling sequence as defined in clause 5.5.4 of EN 302 307.1008There is no explicit signalling method to convey scrambling sequence index1009to the receiver. If S2 satellite delivery system descriptor is available1010it can be used to read the scrambling sequence index (EN 300 468 table 41).1011 1012By default, gold scrambling sequence index 0 is used.1013 1014The valid scrambling sequence index range is from 0 to 262142.1015