Commit 1181415d authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab

media: fe_property_parameters.rst: better define properties usage

Several frontend properties are specific to a subset of the
delivery systems. Make it clearer when describing each
property.
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent 9d5e27cb
......@@ -111,6 +111,8 @@ 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``.
......@@ -148,6 +150,7 @@ 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
......@@ -161,8 +164,9 @@ Currently not implemented.
DTV_SYMBOL_RATE
===============
Digital TV symbol rate, in bauds (symbols/second). Used on cable
standards.
Used on cable and satellite delivery systems.
Digital TV symbol rate, in bauds (symbols/second).
.. _DTV-INNER-FEC:
......@@ -170,7 +174,7 @@ standards.
DTV_INNER_FEC
=============
Used cable/satellite transmissions.
Used on cable and satellite delivery systems.
The acceptable values are defined by :c:type:`fe_code_rate`.
......@@ -180,6 +184,8 @@ The acceptable values are defined by :c:type:`fe_code_rate`.
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
......@@ -201,6 +207,8 @@ Currently not used.
DTV_PILOT
=========
Used on DVB-S2.
Sets DVB-S2 pilot.
The acceptable values are defined by :c:type:`fe_pilot`.
......@@ -211,7 +219,9 @@ The acceptable values are defined by :c:type:`fe_pilot`.
DTV_ROLLOFF
===========
Sets DVB-S2 rolloff
Used on DVB-S2.
Sets DVB-S2 rolloff.
The acceptable values are defined by :c:type:`fe_rolloff`.
......@@ -245,7 +255,7 @@ Currently not implemented.
DTV_DELIVERY_SYSTEM
===================
Specifies the type of Delivery system.
Specifies the type of the delivery system.
The acceptable values are defined by :c:type:`fe_delivery_system`.
......@@ -255,6 +265,8 @@ The acceptable values are defined by :c:type:`fe_delivery_system`.
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.
......@@ -273,6 +285,8 @@ Possible values: 0, 1, -1 (AUTO)
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``).
......@@ -285,6 +299,8 @@ Possible values: 0, 1, -1 (AUTO)
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
......@@ -320,6 +336,8 @@ Possible values: 0 .. 41, -1 (AUTO)
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
......@@ -336,6 +354,8 @@ Note: This value cannot be determined by an automatic channel search.
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
......@@ -351,6 +371,8 @@ Note: This value cannot be determined by an automatic channel search.
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.
......@@ -367,6 +389,8 @@ There are 3 parameter sets, for Layers A, B and C.
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
......@@ -397,6 +421,8 @@ Only the values of the first 3 bits are used. Other bits will be silently ignore
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`.
......@@ -410,6 +436,8 @@ Possible values are: ``FEC_AUTO``, ``FEC_1_2``, ``FEC_2_3``, ``FEC_3_4``,
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`.
......@@ -428,6 +456,8 @@ Possible values are: ``QAM_AUTO``, ``QPSK``, ``QAM_16``, ``QAM_64``, ``DQPSK``
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
......@@ -517,6 +547,8 @@ Note: Truth table for ``DTV_ISDBT_SOUND_BROADCASTING`` and
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.
......@@ -590,6 +622,8 @@ TMCC-structure, as shown in the table below.
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
......@@ -603,6 +637,8 @@ Possible values: 0, 1, 2, 3, ..., 30, 31
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
......@@ -616,6 +652,8 @@ Possible values: 0, 1, 2, 3, ..., 126, 127
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
......@@ -626,6 +664,8 @@ Possible values: 1, 2, 3, 4, 5, 6, 7, 8
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.
......@@ -637,6 +677,8 @@ Possible values: 0, 1, 2, 3, ..., 30, 31
DTV_ATSCMH_SGN
--------------
Used only on ATSC-MH.
Start group number.
Possible values: 0, 1, 2, 3, ..., 14, 15
......@@ -647,6 +689,8 @@ Possible values: 0, 1, 2, 3, ..., 14, 15
DTV_ATSCMH_PRC
--------------
Used only on ATSC-MH.
Parade repetition cycle.
Possible values: 1, 2, 3, 4, 5, 6, 7, 8
......@@ -657,6 +701,8 @@ Possible values: 1, 2, 3, 4, 5, 6, 7, 8
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`.
......@@ -667,6 +713,8 @@ The acceptable values are defined by :c:type:`atscmh_rs_frame_mode`.
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`.
......@@ -677,6 +725,8 @@ The acceptable values are defined by :c:type:`atscmh_rs_frame_ensemble`.
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`.
......@@ -687,6 +737,8 @@ The acceptable values are defined by :c:type:`atscmh_rs_code_mode`.
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`.
......@@ -697,6 +749,8 @@ The acceptable values are defined by :c:type:`atscmh_rs_code_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`.
......@@ -707,6 +761,8 @@ The acceptable values are defined by :c:type:`atscmh_sccc_block_mode`.
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`.
......@@ -716,6 +772,8 @@ The acceptable values are defined by :c:type:`atscmh_sccc_code_mode`.
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
......@@ -727,6 +785,8 @@ Possible values are the same as documented on enum
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
......@@ -738,6 +798,8 @@ Possible values are the same as documented on enum
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
......@@ -797,9 +859,11 @@ The acceptable values are defined by :c:type:`fe_guard_interval`.
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. This is used only on OFTM-based standards,
e. g. DVB-T/T2, ISDB-T, DTMB.
carriers) used by the standard.
The acceptable values are defined by :c:type:`fe_transmit_mode`.
......@@ -832,6 +896,8 @@ The acceptable values are defined by :c:type:`fe_transmit_mode`.
DTV_HIERARCHY
=============
Used only on DVB-T and DVB-T2.
Frontend hierarchy.
The acceptable values are defined by :c:type:`fe_hierarchy`.
......@@ -842,6 +908,8 @@ The acceptable values are defined by :c:type:`fe_hierarchy`.
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 DVB driver to
handle substream filtering, when supported by the hardware. By default,
......
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