From 453d63c6a1afff9aa7e83ac9c3a9dbd6254a1fcd Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Wed, 16 Sep 2009 23:22:05 -0300 Subject: V4L/DVB (12915): DocBook/media: Add isdb-t documentation Adds ISDB-T_and_ISDB-Tsb_with_S2API spec converted into DocBook format. The text is authored by Patrick Boettcher, and was converted to DocBook by me. Signed-off-by: Mauro Carvalho Chehab --- Documentation/DocBook/dvb/.gitignore | 1 + Documentation/DocBook/dvb/dvbapi.xml | 8 + Documentation/DocBook/dvb/frontend.xml | 1 + Documentation/DocBook/dvb/isdbt.xml | 313 +++++++++++++++++++++++++++++++++ Documentation/DocBook/v4l/.gitignore | 1 + 5 files changed, 324 insertions(+) create mode 100644 Documentation/DocBook/dvb/.gitignore create mode 100644 Documentation/DocBook/dvb/isdbt.xml create mode 100644 Documentation/DocBook/v4l/.gitignore diff --git a/Documentation/DocBook/dvb/.gitignore b/Documentation/DocBook/dvb/.gitignore new file mode 100644 index 0000000..d7ec32e --- /dev/null +++ b/Documentation/DocBook/dvb/.gitignore @@ -0,0 +1 @@ +!*.xml diff --git a/Documentation/DocBook/dvb/dvbapi.xml b/Documentation/DocBook/dvb/dvbapi.xml index d53ca4e..4fc5b23 100644 --- a/Documentation/DocBook/dvb/dvbapi.xml +++ b/Documentation/DocBook/dvb/dvbapi.xml @@ -30,6 +30,14 @@ +2.0.1 +2009-09-16 +mcc + +Added ISDB-T test originally written by Patrick Boettcher + + + 2.0.0 2009-09-06 mcc diff --git a/Documentation/DocBook/dvb/frontend.xml b/Documentation/DocBook/dvb/frontend.xml index 028c9f2..9d89a7b 100644 --- a/Documentation/DocBook/dvb/frontend.xml +++ b/Documentation/DocBook/dvb/frontend.xml @@ -1763,3 +1763,4 @@ modulation mode which can be one of the following: +&sub-isdbt; diff --git a/Documentation/DocBook/dvb/isdbt.xml b/Documentation/DocBook/dvb/isdbt.xml new file mode 100644 index 0000000..39e4696 --- /dev/null +++ b/Documentation/DocBook/dvb/isdbt.xml @@ -0,0 +1,313 @@ +
+ ISDB-T frontend + This section describes shortly what are the possible parameters in the Linux + DVB-API called "S2API" and now DVB API 5 in order to tune an ISDB-T/ISDB-Tsb + demodulator: + + This ISDB-T/ISDB-Tsb API extension should reflect all information + needed to tune any ISDB-T/ISDB-Tsb hardware. Of course it is possible + that some very sophisticated devices won't need certain parameters to + tune. + + The information given here should help application writers to know how + to handle ISDB-T and ISDB-Tsb hardware using the Linux DVB-API. + + The details given here about ISDB-T and ISDB-Tsb are just enough to + basically show the dependencies between the needed parameter values, + but surely some information is left out. For more detailed information + see the following documents: + + ARIB STD-B31 - "Transmission System for Digital Terrestrial + Television Broadcasting" and + ARIB TR-B14 - "Operational Guidelines for Digital Terrestrial + Television Broadcasting". + + In order to read this document one has to have some knowledge the + channel structure in ISDB-T and ISDB-Tsb. I.e. it has to be known to + the reader that an ISDB-T channel consists of 13 segments, that it can + have up to 3 layer sharing those segments, and things like that. + + Parameters used by ISDB-T and ISDB-Tsb. + +
+ Parameters that are common with DVB-T and ATSC + +
+ <constant>DTV_FREQUENCY</constant> + + Central frequency of the channel. + + For ISDB-T the channels are usally transmitted with an offset of 143kHz. E.g. a + valid frequncy could be 474143 kHz. The stepping is bound to the bandwidth of + the channel which is 6MHz. + + As in ISDB-Tsb the channel consists of only one or three segments the + frequency step is 429kHz, 3*429 respectively. As for ISDB-T the + central frequency of the channel is expected. +
+ +
+ <constant>DTV_BANDWIDTH_HZ</constant> (optional) + + Possible values: + + For ISDB-T it should be always 6000000Hz (6MHz) + For ISDB-Tsb it can vary depending on the number of connected segments + + Note: Hardware specific values might be given here, but standard + applications should not bother to set a value to this field as + standard demods are ignoring it anyway. + + Bandwidth in ISDB-T is fixed (6MHz) or can be easily derived from + other parameters (DTV_ISDBT_SB_SEGMENT_IDX, + DTV_ISDBT_SB_SEGMENT_COUNT). +
+ +
+ <constant>DTV_DELIVERY_SYSTEM</constant> + + Possible values: SYS_ISDBT +
+ +
+ <constant>DTV_TRANSMISSION_MODE</constant> + + ISDB-T supports three carrier/symbol-size: 8K, 4K, 2K. It is called + 'mode' in the standard: Mode 1 is 2K, mode 2 is 4K, mode 3 is 8K + + Possible values: TRANSMISSION_MODE_2K, TRANSMISSION_MODE_8K, + TRANSMISSION_MODE_AUTO, TRANSMISSION_MODE_4K + + 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. + + TRANSMISSION_MODE_4K is added at the same time as the other new parameters. +
+ +
+ <constant>DTV_GUARD_INTERVAL</constant> + + Possible values: GUARD_INTERVAL_1_32, GUARD_INTERVAL_1_16, GUARD_INTERVAL_1_8, + GUARD_INTERVAL_1_4, GUARD_INTERVAL_AUTO + + 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. +
+
+
ISDB-T only parameters + +
+ <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> + + 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) +
+ +
+ <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> + + 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) +
+ +
+ <constant>DTV_ISDBT_SB_SUBCHANNEL_ID</constant> + + 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) +
+ +
+ + <constant>DTV_ISDBT_SB_SEGMENT_IDX</constant> + + 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. +
+ +
+ <constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant> + + 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. +
+ +
+ Hierarchical layers + + 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. + +
+ <constant>DTV_ISDBT_LAYER_ENABLED</constant> + + 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. + + Possible values: 0x1, 0x2, 0x4 (|-able) + + DTV_ISDBT_LAYER_ENABLED[0:0] - layer A + DTV_ISDBT_LAYER_ENABLED[1:1] - layer B + DTV_ISDBT_LAYER_ENABLED[2:2] - layer C + DTV_ISDBT_LAYER_ENABLED[31:3] unused +
+ +
+ <constant>DTV_ISDBT_LAYER*_FEC</constant> + + Possible values: FEC_AUTO, FEC_1_2, FEC_2_3, FEC_3_4, FEC_5_6, FEC_7_8 +
+ +
+ <constant>DTV_ISDBT_LAYER*_MODULATION</constant> + + Possible values: QAM_AUTO, QPSK, QAM_16, QAM_64, DQPSK + + Note: If layer C is DQPSK layer B has to be DQPSK. If layer B is DQPSK + and DTV_ISDBT_PARTIAL_RECEPTION=0 layer has to be DQPSK. +
+ +
+ <constant>DTV_ISDBT_LAYER*_SEGMENT_COUNT</constant> + + 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*_SEGMENT_COUNT + + + + + + + PR + SB + Layer A width + Layer B width + Layer C width + total width + + + + 0 + 0 + 1 .. 13 + 1 .. 13 + 1 .. 13 + 13 + + + + 1 + 0 + 1 + 1 .. 13 + 1 .. 13 + 13 + + + + 0 + 1 + 1 + 0 + 0 + 1 + + + + 1 + 1 + 1 + 2 + 0 + 13 + + + + + + +
+ +
+ <constant>DTV_ISDBT_LAYER*_TIME_INTERLEAVING</constant> + + Possible values: 0, 1, 2, 3, -1 (AUTO) + + Note: The real inter-leaver depth-names depend on the mode (fft-size); the values + here are referring to what can be found in the TMCC-structure - + independent of the mode. +
+
+
+
diff --git a/Documentation/DocBook/v4l/.gitignore b/Documentation/DocBook/v4l/.gitignore new file mode 100644 index 0000000..d7ec32e --- /dev/null +++ b/Documentation/DocBook/v4l/.gitignore @@ -0,0 +1 @@ +!*.xml -- cgit v1.1