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.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later |
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.. _fe_property_parameters: |
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****************************** |
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Digital TV property parameters |
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****************************** |
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There are several different Digital TV parameters that can be used by |
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:ref:`FE_SET_PROPERTY and FE_GET_PROPERTY ioctls<FE_GET_PROPERTY>`. |
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This section describes each of them. Please notice, however, that only |
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a subset of them are needed to setup a frontend. |
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.. _DTV-UNDEFINED: |
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DTV_UNDEFINED |
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============= |
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Used internally. A GET/SET operation for it won't change or return |
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anything. |
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.. _DTV-TUNE: |
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DTV_TUNE |
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======== |
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Interpret the cache of data, build either a traditional frontend |
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tunerequest so we can pass validation in the ``FE_SET_FRONTEND`` ioctl. |
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.. _DTV-CLEAR: |
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DTV_CLEAR |
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========= |
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Reset a cache of data specific to the frontend here. This does not |
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effect hardware. |
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.. _DTV-FREQUENCY: |
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DTV_FREQUENCY |
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============= |
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Frequency of the digital TV transponder/channel. |
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.. note:: |
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#. For satellite delivery systems, the frequency is in kHz. |
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#. For cable and terrestrial delivery systems, the frequency is in |
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Hz. |
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#. On most delivery systems, the frequency is the center frequency |
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of the transponder/channel. The exception is for ISDB-T, where |
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the main carrier has a 1/7 offset from the center. |
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#. For ISDB-T, the channels are usually transmitted with an offset of |
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about 143kHz. E.g. a valid frequency could be 474,143 kHz. The |
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stepping is bound to the bandwidth of the channel which is |
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typically 6MHz. |
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#. In ISDB-Tsb, the channel consists of only one or three segments the |
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frequency step is 429kHz, 3*429 respectively. |
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.. _DTV-MODULATION: |
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DTV_MODULATION |
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============== |
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Specifies the frontend modulation type for delivery systems that |
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supports more multiple modulations. |
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The modulation can be one of the types defined by enum :c:type:`fe_modulation`. |
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Most of the digital TV standards offers more than one possible |
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modulation type. |
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The table below presents a summary of the types of modulation types |
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supported by each delivery system, as currently defined by specs. |
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======================= ======================================================= |
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Standard Modulation types |
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======================= ======================================================= |
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ATSC (version 1) 8-VSB and 16-VSB. |
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DMTB 4-QAM, 16-QAM, 32-QAM, 64-QAM and 4-QAM-NR. |
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DVB-C Annex A/C 16-QAM, 32-QAM, 64-QAM and 256-QAM. |
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DVB-C Annex B 64-QAM. |
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DVB-T QPSK, 16-QAM and 64-QAM. |
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DVB-T2 QPSK, 16-QAM, 64-QAM and 256-QAM. |
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DVB-S No need to set. It supports only QPSK. |
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DVB-S2 QPSK, 8-PSK, 16-APSK and 32-APSK. |
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ISDB-T QPSK, DQPSK, 16-QAM and 64-QAM. |
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ISDB-S 8-PSK, QPSK and BPSK. |
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======================= ======================================================= |
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.. note:: |
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Please notice that some of the above modulation types may not be |
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defined currently at the Kernel. The reason is simple: no driver |
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needed such definition yet. |
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.. _DTV-BANDWIDTH-HZ: |
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DTV_BANDWIDTH_HZ |
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================ |
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Bandwidth for the channel, in HZ. |
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Should be set only for terrestrial delivery systems. |
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Possible values: ``1712000``, ``5000000``, ``6000000``, ``7000000``, |
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``8000000``, ``10000000``. |
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======================= ======================================================= |
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Terrestrial Standard Possible values for bandwidth |
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======================= ======================================================= |
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ATSC (version 1) No need to set. It is always 6MHz. |
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DMTB No need to set. It is always 8MHz. |
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DVB-T 6MHz, 7MHz and 8MHz. |
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DVB-T2 1.172 MHz, 5MHz, 6MHz, 7MHz, 8MHz and 10MHz |
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ISDB-T 5MHz, 6MHz, 7MHz and 8MHz, although most places |
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use 6MHz. |
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======================= ======================================================= |
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.. note:: |
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#. For ISDB-Tsb, the bandwidth can vary depending on the number of |
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connected segments. |
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It can be easily derived from other parameters |
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(DTV_ISDBT_SB_SEGMENT_IDX, DTV_ISDBT_SB_SEGMENT_COUNT). |
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#. On Satellite and Cable delivery systems, the bandwidth depends on |
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the symbol rate. So, the Kernel will silently ignore any setting |
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:ref:`DTV-BANDWIDTH-HZ`. I will however fill it back with a |
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bandwidth estimation. |
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Such bandwidth estimation takes into account the symbol rate set with |
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:ref:`DTV-SYMBOL-RATE`, and the rolloff factor, with is fixed for |
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DVB-C and DVB-S. |
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For DVB-S2, the rolloff should also be set via :ref:`DTV-ROLLOFF`. |
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.. _DTV-INVERSION: |
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DTV_INVERSION |
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============= |
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Specifies if the frontend should do spectral inversion or not. |
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The acceptable values are defined by :c:type:`fe_spectral_inversion`. |
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.. _DTV-DISEQC-MASTER: |
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DTV_DISEQC_MASTER |
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================= |
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Currently not implemented. |
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.. _DTV-SYMBOL-RATE: |
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DTV_SYMBOL_RATE |
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=============== |
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Used on cable and satellite delivery systems. |
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Digital TV symbol rate, in bauds (symbols/second). |
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.. _DTV-INNER-FEC: |
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DTV_INNER_FEC |
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============= |
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Used on cable and satellite delivery systems. |
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The acceptable values are defined by :c:type:`fe_code_rate`. |
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.. _DTV-VOLTAGE: |
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DTV_VOLTAGE |
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=========== |
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Used on satellite delivery systems. |
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The voltage is usually used with non-DiSEqC capable LNBs to switch the |
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polarzation (horizontal/vertical). When using DiSEqC epuipment this |
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voltage has to be switched consistently to the DiSEqC commands as |
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described in the DiSEqC spec. |
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The acceptable values are defined by :c:type:`fe_sec_voltage`. |
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.. _DTV-TONE: |
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DTV_TONE |
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======== |
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Currently not used. |
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.. _DTV-PILOT: |
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DTV_PILOT |
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========= |
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Used on DVB-S2. |
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Sets DVB-S2 pilot. |
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The acceptable values are defined by :c:type:`fe_pilot`. |
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.. _DTV-ROLLOFF: |
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DTV_ROLLOFF |
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=========== |
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Used on DVB-S2. |
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Sets DVB-S2 rolloff. |
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The acceptable values are defined by :c:type:`fe_rolloff`. |
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.. _DTV-DISEQC-SLAVE-REPLY: |
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DTV_DISEQC_SLAVE_REPLY |
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====================== |
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Currently not implemented. |
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.. _DTV-FE-CAPABILITY-COUNT: |
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DTV_FE_CAPABILITY_COUNT |
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======================= |
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Currently not implemented. |
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.. _DTV-FE-CAPABILITY: |
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DTV_FE_CAPABILITY |
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================= |
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Currently not implemented. |
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.. _DTV-DELIVERY-SYSTEM: |
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DTV_DELIVERY_SYSTEM |
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=================== |
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Specifies the type of the delivery system. |
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The acceptable values are defined by :c:type:`fe_delivery_system`. |
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.. _DTV-ISDBT-PARTIAL-RECEPTION: |
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DTV_ISDBT_PARTIAL_RECEPTION |
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=========================== |
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Used only on ISDB. |
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If ``DTV_ISDBT_SOUND_BROADCASTING`` is '0' this bit-field represents |
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whether the channel is in partial reception mode or not. |
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If '1' ``DTV_ISDBT_LAYERA_*`` values are assigned to the center segment |
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and ``DTV_ISDBT_LAYERA_SEGMENT_COUNT`` has to be '1'. |
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If in addition ``DTV_ISDBT_SOUND_BROADCASTING`` is '1' |
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``DTV_ISDBT_PARTIAL_RECEPTION`` represents whether this ISDB-Tsb channel |
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is consisting of one segment and layer or three segments and two layers. |
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Possible values: 0, 1, -1 (AUTO) |
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.. _DTV-ISDBT-SOUND-BROADCASTING: |
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DTV_ISDBT_SOUND_BROADCASTING |
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============================ |
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Used only on ISDB. |
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This field represents whether the other DTV_ISDBT_*-parameters are |
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referring to an ISDB-T and an ISDB-Tsb channel. (See also |
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``DTV_ISDBT_PARTIAL_RECEPTION``). |
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Possible values: 0, 1, -1 (AUTO) |
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.. _DTV-ISDBT-SB-SUBCHANNEL-ID: |
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DTV_ISDBT_SB_SUBCHANNEL_ID |
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========================== |
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Used only on ISDB. |
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This field only applies if ``DTV_ISDBT_SOUND_BROADCASTING`` is '1'. |
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(Note of the author: This might not be the correct description of the |
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``SUBCHANNEL-ID`` in all details, but it is my understanding of the |
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technical background needed to program a device) |
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An ISDB-Tsb channel (1 or 3 segments) can be broadcasted alone or in a |
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set of connected ISDB-Tsb channels. In this set of channels every |
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channel can be received independently. The number of connected ISDB-Tsb |
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segment can vary, e.g. depending on the frequency spectrum bandwidth |
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available. |
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Example: Assume 8 ISDB-Tsb connected segments are broadcasted. The |
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broadcaster has several possibilities to put those channels in the air: |
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Assuming a normal 13-segment ISDB-T spectrum he can align the 8 segments |
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from position 1-8 to 5-13 or anything in between. |
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The underlying layer of segments are subchannels: each segment is |
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consisting of several subchannels with a predefined IDs. A sub-channel |
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is used to help the demodulator to synchronize on the channel. |
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An ISDB-T channel is always centered over all sub-channels. As for the |
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example above, in ISDB-Tsb it is no longer as simple as that. |
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``The DTV_ISDBT_SB_SUBCHANNEL_ID`` parameter is used to give the |
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sub-channel ID of the segment to be demodulated. |
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Possible values: 0 .. 41, -1 (AUTO) |
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.. _DTV-ISDBT-SB-SEGMENT-IDX: |
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DTV_ISDBT_SB_SEGMENT_IDX |
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======================== |
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Used only on ISDB. |
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This field only applies if ``DTV_ISDBT_SOUND_BROADCASTING`` is '1'. |
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``DTV_ISDBT_SB_SEGMENT_IDX`` gives the index of the segment to be |
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demodulated for an ISDB-Tsb channel where several of them are |
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transmitted in the connected manner. |
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Possible values: 0 .. ``DTV_ISDBT_SB_SEGMENT_COUNT`` - 1 |
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Note: This value cannot be determined by an automatic channel search. |
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.. _DTV-ISDBT-SB-SEGMENT-COUNT: |
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DTV_ISDBT_SB_SEGMENT_COUNT |
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========================== |
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Used only on ISDB. |
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This field only applies if ``DTV_ISDBT_SOUND_BROADCASTING`` is '1'. |
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``DTV_ISDBT_SB_SEGMENT_COUNT`` gives the total count of connected |
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ISDB-Tsb channels. |
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Possible values: 1 .. 13 |
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Note: This value cannot be determined by an automatic channel search. |
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.. _isdb-hierq-layers: |
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DTV-ISDBT-LAYER[A-C] parameters |
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=============================== |
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Used only on ISDB. |
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ISDB-T channels can be coded hierarchically. As opposed to DVB-T in |
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ISDB-T hierarchical layers can be decoded simultaneously. For that |
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reason a ISDB-T demodulator has 3 Viterbi and 3 Reed-Solomon decoders. |
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ISDB-T has 3 hierarchical layers which each can use a part of the |
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available segments. The total number of segments over all layers has to |
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13 in ISDB-T. |
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There are 3 parameter sets, for Layers A, B and C. |
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.. _DTV-ISDBT-LAYER-ENABLED: |
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DTV_ISDBT_LAYER_ENABLED |
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----------------------- |
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Used only on ISDB. |
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Hierarchical reception in ISDB-T is achieved by enabling or disabling |
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layers in the decoding process. Setting all bits of |
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``DTV_ISDBT_LAYER_ENABLED`` to '1' forces all layers (if applicable) to |
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be demodulated. This is the default. |
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If the channel is in the partial reception mode |
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(``DTV_ISDBT_PARTIAL_RECEPTION`` = 1) the central segment can be decoded |
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independently of the other 12 segments. In that mode layer A has to have |
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a ``SEGMENT_COUNT`` of 1. |
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In ISDB-Tsb only layer A is used, it can be 1 or 3 in ISDB-Tsb according |
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to ``DTV_ISDBT_PARTIAL_RECEPTION``. ``SEGMENT_COUNT`` must be filled |
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accordingly. |
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Only the values of the first 3 bits are used. Other bits will be silently ignored: |
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``DTV_ISDBT_LAYER_ENABLED`` bit 0: layer A enabled |
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``DTV_ISDBT_LAYER_ENABLED`` bit 1: layer B enabled |
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``DTV_ISDBT_LAYER_ENABLED`` bit 2: layer C enabled |
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``DTV_ISDBT_LAYER_ENABLED`` bits 3-31: unused |
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.. _DTV-ISDBT-LAYER-FEC: |
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DTV_ISDBT_LAYER[A-C]_FEC |
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------------------------ |
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Used only on ISDB. |
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The Forward Error Correction mechanism used by a given ISDB Layer, as |
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defined by :c:type:`fe_code_rate`. |
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Possible values are: ``FEC_AUTO``, ``FEC_1_2``, ``FEC_2_3``, ``FEC_3_4``, |
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``FEC_5_6``, ``FEC_7_8`` |
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.. _DTV-ISDBT-LAYER-MODULATION: |
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DTV_ISDBT_LAYER[A-C]_MODULATION |
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------------------------------- |
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Used only on ISDB. |
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The modulation used by a given ISDB Layer, as defined by |
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:c:type:`fe_modulation`. |
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Possible values are: ``QAM_AUTO``, ``QPSK``, ``QAM_16``, ``QAM_64``, ``DQPSK`` |
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.. note:: |
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#. If layer C is ``DQPSK``, then layer B has to be ``DQPSK``. |
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#. If layer B is ``DQPSK`` and ``DTV_ISDBT_PARTIAL_RECEPTION``\ = 0, |
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then layer has to be ``DQPSK``. |
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.. _DTV-ISDBT-LAYER-SEGMENT-COUNT: |
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DTV_ISDBT_LAYER[A-C]_SEGMENT_COUNT |
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---------------------------------- |
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Used only on ISDB. |
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Possible values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, -1 (AUTO) |
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Note: Truth table for ``DTV_ISDBT_SOUND_BROADCASTING`` and |
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``DTV_ISDBT_PARTIAL_RECEPTION`` and ``LAYER[A-C]_SEGMENT_COUNT`` |
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.. _isdbt-layer_seg-cnt-table: |
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.. flat-table:: Truth table for ISDB-T Sound Broadcasting |
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:header-rows: 1 |
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:stub-columns: 0 |
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- .. row 1 |
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- Partial Reception |
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- Sound Broadcasting |
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- Layer A width |
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- Layer B width |
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- Layer C width |
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- total width |
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- .. row 2 |
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- 0 |
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- 0 |
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- 1 .. 13 |
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- 1 .. 13 |
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- 1 .. 13 |
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- 13 |
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- .. row 3 |
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- 1 |
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- 0 |
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- 1 |
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- 1 .. 13 |
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- 1 .. 13 |
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- 13 |
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- .. row 4 |
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- 0 |
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- 1 |
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- 1 |
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- 0 |
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- 0 |
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- 1 |
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- .. row 5 |
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- 1 |
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- 1 |
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- 1 |
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- 2 |
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- 0 |
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- 13 |
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.. _DTV-ISDBT-LAYER-TIME-INTERLEAVING: |
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DTV_ISDBT_LAYER[A-C]_TIME_INTERLEAVING |
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-------------------------------------- |
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Used only on ISDB. |
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Valid values: 0, 1, 2, 4, -1 (AUTO) |
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when DTV_ISDBT_SOUND_BROADCASTING is active, value 8 is also valid. |
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Note: The real time interleaving length depends on the mode (fft-size). |
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The values here are referring to what can be found in the |
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TMCC-structure, as shown in the table below. |
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.. c:type:: isdbt_layer_interleaving_table |
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.. flat-table:: ISDB-T time interleaving modes |
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:header-rows: 1 |
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:stub-columns: 0 |
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- .. row 1 |
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- ``DTV_ISDBT_LAYER[A-C]_TIME_INTERLEAVING`` |
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- Mode 1 (2K FFT) |
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- Mode 2 (4K FFT) |
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- Mode 3 (8K FFT) |
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- .. row 2 |
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- 0 |
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- 0 |
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- 0 |
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- 0 |
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- .. row 3 |
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- 1 |
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- 4 |
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- 2 |
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- 1 |
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- .. row 4 |
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- 2 |
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- 8 |
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- 4 |
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- 2 |
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- .. row 5 |
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- 4 |
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- 16 |
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- 8 |
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- 4 |
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.. _DTV-ATSCMH-FIC-VER: |
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DTV_ATSCMH_FIC_VER |
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------------------ |
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Used only on ATSC-MH. |
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Version number of the FIC (Fast Information Channel) signaling data. |
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FIC is used for relaying information to allow rapid service acquisition |
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by the receiver. |
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Possible values: 0, 1, 2, 3, ..., 30, 31 |
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.. _DTV-ATSCMH-PARADE-ID: |
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DTV_ATSCMH_PARADE_ID |
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-------------------- |
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Used only on ATSC-MH. |
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Parade identification number |
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A parade is a collection of up to eight MH groups, conveying one or two |
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ensembles. |
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Possible values: 0, 1, 2, 3, ..., 126, 127 |
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.. _DTV-ATSCMH-NOG: |
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DTV_ATSCMH_NOG |
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-------------- |
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Used only on ATSC-MH. |
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Number of MH groups per MH subframe for a designated parade. |
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Possible values: 1, 2, 3, 4, 5, 6, 7, 8 |
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.. _DTV-ATSCMH-TNOG: |
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DTV_ATSCMH_TNOG |
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--------------- |
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Used only on ATSC-MH. |
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Total number of MH groups including all MH groups belonging to all MH |
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parades in one MH subframe. |
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Possible values: 0, 1, 2, 3, ..., 30, 31 |
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.. _DTV-ATSCMH-SGN: |
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DTV_ATSCMH_SGN |
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-------------- |
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Used only on ATSC-MH. |
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Start group number. |
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Possible values: 0, 1, 2, 3, ..., 14, 15 |
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.. _DTV-ATSCMH-PRC: |
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DTV_ATSCMH_PRC |
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-------------- |
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Used only on ATSC-MH. |
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Parade repetition cycle. |
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Possible values: 1, 2, 3, 4, 5, 6, 7, 8 |
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.. _DTV-ATSCMH-RS-FRAME-MODE: |
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DTV_ATSCMH_RS_FRAME_MODE |
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------------------------ |
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Used only on ATSC-MH. |
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Reed Solomon (RS) frame mode. |
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The acceptable values are defined by :c:type:`atscmh_rs_frame_mode`. |
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.. _DTV-ATSCMH-RS-FRAME-ENSEMBLE: |
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DTV_ATSCMH_RS_FRAME_ENSEMBLE |
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---------------------------- |
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Used only on ATSC-MH. |
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Reed Solomon(RS) frame ensemble. |
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The acceptable values are defined by :c:type:`atscmh_rs_frame_ensemble`. |
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.. _DTV-ATSCMH-RS-CODE-MODE-PRI: |
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DTV_ATSCMH_RS_CODE_MODE_PRI |
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--------------------------- |
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Used only on ATSC-MH. |
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Reed Solomon (RS) code mode (primary). |
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The acceptable values are defined by :c:type:`atscmh_rs_code_mode`. |
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.. _DTV-ATSCMH-RS-CODE-MODE-SEC: |
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DTV_ATSCMH_RS_CODE_MODE_SEC |
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--------------------------- |
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Used only on ATSC-MH. |
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Reed Solomon (RS) code mode (secondary). |
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The acceptable values are defined by :c:type:`atscmh_rs_code_mode`. |
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.. _DTV-ATSCMH-SCCC-BLOCK-MODE: |
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DTV_ATSCMH_SCCC_BLOCK_MODE |
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-------------------------- |
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Used only on ATSC-MH. |
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Series Concatenated Convolutional Code Block Mode. |
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The acceptable values are defined by :c:type:`atscmh_sccc_block_mode`. |
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.. _DTV-ATSCMH-SCCC-CODE-MODE-A: |
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DTV_ATSCMH_SCCC_CODE_MODE_A |
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--------------------------- |
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Used only on ATSC-MH. |
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Series Concatenated Convolutional Code Rate. |
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The acceptable values are defined by :c:type:`atscmh_sccc_code_mode`. |
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.. _DTV-ATSCMH-SCCC-CODE-MODE-B: |
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DTV_ATSCMH_SCCC_CODE_MODE_B |
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--------------------------- |
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Used only on ATSC-MH. |
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Series Concatenated Convolutional Code Rate. |
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Possible values are the same as documented on enum |
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:c:type:`atscmh_sccc_code_mode`. |
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.. _DTV-ATSCMH-SCCC-CODE-MODE-C: |
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DTV_ATSCMH_SCCC_CODE_MODE_C |
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--------------------------- |
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Used only on ATSC-MH. |
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Series Concatenated Convolutional Code Rate. |
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Possible values are the same as documented on enum |
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:c:type:`atscmh_sccc_code_mode`. |
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.. _DTV-ATSCMH-SCCC-CODE-MODE-D: |
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DTV_ATSCMH_SCCC_CODE_MODE_D |
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--------------------------- |
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Used only on ATSC-MH. |
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Series Concatenated Convolutional Code Rate. |
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Possible values are the same as documented on enum |
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:c:type:`atscmh_sccc_code_mode`. |
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.. _DTV-API-VERSION: |
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DTV_API_VERSION |
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=============== |
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Returns the major/minor version of the Digital TV API |
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.. _DTV-CODE-RATE-HP: |
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DTV_CODE_RATE_HP |
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================ |
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Used on terrestrial transmissions. |
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The acceptable values are defined by :c:type:`fe_transmit_mode`. |
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.. _DTV-CODE-RATE-LP: |
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DTV_CODE_RATE_LP |
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================ |
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Used on terrestrial transmissions. |
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The acceptable values are defined by :c:type:`fe_transmit_mode`. |
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.. _DTV-GUARD-INTERVAL: |
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DTV_GUARD_INTERVAL |
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================== |
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The acceptable values are defined by :c:type:`fe_guard_interval`. |
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.. note:: |
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#. If ``DTV_GUARD_INTERVAL`` is set the ``GUARD_INTERVAL_AUTO`` the |
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hardware will try to find the correct guard interval (if capable) and |
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will use TMCC to fill in the missing parameters. |
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#. Intervals ``GUARD_INTERVAL_1_128``, ``GUARD_INTERVAL_19_128`` |
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and ``GUARD_INTERVAL_19_256`` are used only for DVB-T2 at |
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present. |
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#. Intervals ``GUARD_INTERVAL_PN420``, ``GUARD_INTERVAL_PN595`` and |
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``GUARD_INTERVAL_PN945`` are used only for DMTB at the present. |
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On such standard, only those intervals and ``GUARD_INTERVAL_AUTO`` |
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are valid. |
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.. _DTV-TRANSMISSION-MODE: |
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DTV_TRANSMISSION_MODE |
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===================== |
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Used only on OFTM-based standards, e. g. DVB-T/T2, ISDB-T, DTMB. |
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Specifies the FFT size (with corresponds to the approximate number of |
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carriers) used by the standard. |
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The acceptable values are defined by :c:type:`fe_transmit_mode`. |
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.. note:: |
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#. ISDB-T supports three carrier/symbol-size: 8K, 4K, 2K. It is called |
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**mode** on such standard, and are numbered from 1 to 3: |
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==== ======== ======================== |
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Mode FFT size Transmission mode |
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==== ======== ======================== |
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1 2K ``TRANSMISSION_MODE_2K`` |
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2 4K ``TRANSMISSION_MODE_4K`` |
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3 8K ``TRANSMISSION_MODE_8K`` |
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==== ======== ======================== |
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#. If ``DTV_TRANSMISSION_MODE`` is set the ``TRANSMISSION_MODE_AUTO`` |
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the hardware will try to find the correct FFT-size (if capable) and |
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will use TMCC to fill in the missing parameters. |
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#. DVB-T specifies 2K and 8K as valid sizes. |
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#. DVB-T2 specifies 1K, 2K, 4K, 8K, 16K and 32K. |
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#. DTMB specifies C1 and C3780. |
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.. _DTV-HIERARCHY: |
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DTV_HIERARCHY |
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============= |
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Used only on DVB-T and DVB-T2. |
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Frontend hierarchy. |
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The acceptable values are defined by :c:type:`fe_hierarchy`. |
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.. _DTV-STREAM-ID: |
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DTV_STREAM_ID |
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============= |
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Used on DVB-S2, DVB-T2 and ISDB-S. |
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DVB-S2, DVB-T2 and ISDB-S support the transmission of several streams on |
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a single transport stream. This property enables the digital TV driver to |
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handle substream filtering, when supported by the hardware. By default, |
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substream filtering is disabled. |
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For DVB-S2 and DVB-T2, the valid substream id range is from 0 to 255. |
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For ISDB, the valid substream id range is from 1 to 65535. |
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To disable it, you should use the special macro NO_STREAM_ID_FILTER. |
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Note: any value outside the id range also disables filtering. |
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.. _DTV-DVBT2-PLP-ID-LEGACY: |
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DTV_DVBT2_PLP_ID_LEGACY |
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======================= |
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Obsolete, replaced with DTV_STREAM_ID. |
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.. _DTV-ENUM-DELSYS: |
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DTV_ENUM_DELSYS |
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=============== |
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A Multi standard frontend needs to advertise the delivery systems |
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provided. Applications need to enumerate the provided delivery systems, |
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before using any other operation with the frontend. Prior to it's |
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introduction, FE_GET_INFO was used to determine a frontend type. A |
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frontend which provides more than a single delivery system, |
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FE_GET_INFO doesn't help much. Applications which intends to use a |
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multistandard frontend must enumerate the delivery systems associated |
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with it, rather than trying to use FE_GET_INFO. In the case of a |
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legacy frontend, the result is just the same as with FE_GET_INFO, but |
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in a more structured format |
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The acceptable values are defined by :c:type:`fe_delivery_system`. |
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.. _DTV-INTERLEAVING: |
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DTV_INTERLEAVING |
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================ |
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Time interleaving to be used. |
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The acceptable values are defined by :c:type:`fe_interleaving`. |
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.. _DTV-LNA: |
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DTV_LNA |
|
======= |
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Low-noise amplifier. |
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Hardware might offer controllable LNA which can be set manually using |
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that parameter. Usually LNA could be found only from terrestrial devices |
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if at all. |
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Possible values: 0, 1, LNA_AUTO |
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0, LNA off |
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1, LNA on |
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use the special macro LNA_AUTO to set LNA auto |
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.. _DTV-SCRAMBLING-SEQUENCE-INDEX: |
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DTV_SCRAMBLING_SEQUENCE_INDEX |
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============================= |
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Used on DVB-S2. |
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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. |
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There is no explicit signalling method to convey scrambling sequence index |
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to the receiver. If S2 satellite delivery system descriptor is available |
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it can be used to read the scrambling sequence index (EN 300 468 table 41). |
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By default, gold scrambling sequence index 0 is used. |
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The valid scrambling sequence index range is from 0 to 262142.
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