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Date: Thu, 31 Aug 2017 20:46:55 -0300
From: Mauro Carvalho Chehab <mchehab@...pensource.com>
To: Linux Doc Mailing List <linux-doc@...r.kernel.org>,
Linux Media Mailing List <linux-media@...r.kernel.org>
Cc: Mauro Carvalho Chehab <mchehab@...pensource.com>,
Mauro Carvalho Chehab <mchehab@...radead.org>,
linux-kernel@...r.kernel.org, Jonathan Corbet <corbet@....net>
Subject: [PATCH 08/15] 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: Mauro Carvalho Chehab <mchehab@...pensource.com>
---
.../media/uapi/dvb/fe_property_parameters.rst | 82 ++++++++++++++++++++--
1 file changed, 75 insertions(+), 7 deletions(-)
diff --git a/Documentation/media/uapi/dvb/fe_property_parameters.rst b/Documentation/media/uapi/dvb/fe_property_parameters.rst
index c6eb74f59b00..e085e84fef38 100644
--- a/Documentation/media/uapi/dvb/fe_property_parameters.rst
+++ b/Documentation/media/uapi/dvb/fe_property_parameters.rst
@@ -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,
--
2.13.5
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