| .. -*- coding: utf-8; mode: rst -*- |
| |
| .. _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 |
