[media] DocBook/dvbproperty.xml: Reorganize the parameters
Put the parameters at the sequencial order as they appear inside the frontend.h header. TODO: fix the per-standard section, to reflect the parameters that should actually be used for each transmission system type. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab
parent
db8d0ea705
commit
17d8bb061f
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@ -197,8 +197,8 @@ get/set up to 64 properties. The actual meaning of each property is described on
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<para><link linkend="DTV-DVBT2-PLP-ID">DTV_DVBT2_PLP_ID</link></para>
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</section>
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<section id="fe_property_common">
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<title>Parameters that are common to all Digital TV standards</title>
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<section id="fe_property_parameters">
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<title>Digital TV property parameters</title>
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<section id="DTV-UNDEFINED">
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<title><constant>DTV_UNDEFINED</constant></title>
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<para>Used internally. A GET/SET operation for it won't change or return anything.</para>
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@ -211,6 +211,20 @@ get/set up to 64 properties. The actual meaning of each property is described on
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<title><constant>DTV_CLEAR</constant></title>
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<para>Reset a cache of data specific to the frontend here. This does not effect hardware.</para>
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</section>
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<section id="DTV-FREQUENCY">
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<title><constant>DTV_FREQUENCY</constant></title>
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<para>Central frequency of the channel, in HZ.</para>
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<para>Notes:</para>
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<para>1)For ISDB-T, the channels are usually transmitted with an offset of 143kHz.
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E.g. a valid frequncy could be 474143 kHz. The stepping is bound to the bandwidth of
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the channel which is 6MHz.</para>
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<para>2)As in ISDB-Tsb the channel consists of only one or three segments the
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frequency step is 429kHz, 3*429 respectively. As for ISDB-T the
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central frequency of the channel is expected.</para>
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</section>
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<section id="DTV-MODULATION">
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<title><constant>DTV_MODULATION</constant></title>
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<para>Specifies the frontend modulation type for cable and satellite types. The modulation can be one of the types bellow:</para>
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@ -232,6 +246,32 @@ get/set up to 64 properties. The actual meaning of each property is described on
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} fe_modulation_t;
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</programlisting>
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</section>
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<section id="DTV-BANDWIDTH-HZ">
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<title><constant>DTV_BANDWIDTH_HZ</constant></title>
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<para>Bandwidth for the channel, in HZ.</para>
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<para>Possible values:
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<constant>1712000</constant>,
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<constant>5000000</constant>,
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<constant>6000000</constant>,
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<constant>7000000</constant>,
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<constant>8000000</constant>,
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<constant>10000000</constant>.
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</para>
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<para>Notes:</para>
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<para>1) For ISDB-T it should be always 6000000Hz (6MHz)</para>
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<para>2) For ISDB-Tsb it can vary depending on the number of connected segments</para>
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<para>3) Bandwidth doesn't apply for DVB-C transmissions, as the bandwidth
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for DVB-C depends on the symbol rate</para>
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<para>4) Bandwidth in ISDB-T is fixed (6MHz) or can be easily derived from
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other parameters (DTV_ISDBT_SB_SEGMENT_IDX,
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DTV_ISDBT_SB_SEGMENT_COUNT).</para>
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<para>5) DVB-T supports 6, 7 and 8MHz.</para>
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<para>6) In addition, DVB-T2 supports 1.172, 5 and 10MHz.</para>
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</section>
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<section id="DTV-INVERSION">
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<title><constant>DTV_INVERSION</constant></title>
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<para>The Inversion field can take one of these values:
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@ -338,6 +378,205 @@ typedef enum fe_rolloff {
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<title><constant>DTV_FE_CAPABILITY</constant></title>
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<para>Currently not implemented.</para>
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</section>
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<section id="DTV-DELIVERY-SYSTEM">
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<title><constant>DTV_DELIVERY_SYSTEM</constant></title>
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<para>Specifies the type of Delivery system</para>
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<section id="fe-delivery-system-t">
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<title>fe_delivery_system type</title>
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<para>Possible values: </para>
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<programlisting>
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typedef enum fe_delivery_system {
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SYS_UNDEFINED,
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SYS_DVBC_ANNEX_AC,
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SYS_DVBC_ANNEX_B,
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SYS_DVBT,
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SYS_DSS,
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SYS_DVBS,
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SYS_DVBS2,
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SYS_DVBH,
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SYS_ISDBT,
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SYS_ISDBS,
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SYS_ISDBC,
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SYS_ATSC,
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SYS_ATSCMH,
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SYS_DMBTH,
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SYS_CMMB,
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SYS_DAB,
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SYS_DVBT2,
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} fe_delivery_system_t;
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</programlisting>
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</section>
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</section>
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<section id="DTV-ISDBT-PARTIAL-RECEPTION">
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<title><constant>DTV_ISDBT_PARTIAL_RECEPTION</constant></title>
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<para>If <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '0' this bit-field represents whether
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the channel is in partial reception mode or not.</para>
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<para>If '1' <constant>DTV_ISDBT_LAYERA_*</constant> values are assigned to the center segment and
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<constant>DTV_ISDBT_LAYERA_SEGMENT_COUNT</constant> has to be '1'.</para>
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<para>If in addition <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'
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<constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> represents whether this ISDB-Tsb channel
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is consisting of one segment and layer or three segments and two layers.</para>
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<para>Possible values: 0, 1, -1 (AUTO)</para>
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</section>
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<section id="DTV-ISDBT-SOUND-BROADCASTING">
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<title><constant>DTV_ISDBT_SOUND_BROADCASTING</constant></title>
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<para>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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<constant>DTV_ISDBT_PARTIAL_RECEPTION</constant>).</para>
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<para>Possible values: 0, 1, -1 (AUTO)</para>
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</section>
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<section id="DTV-ISDBT-SB-SUBCHANNEL-ID">
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<title><constant>DTV_ISDBT_SB_SUBCHANNEL_ID</constant></title>
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<para>This field only applies if <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'.</para>
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<para>(Note of the author: This might not be the correct description of the
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<constant>SUBCHANNEL-ID</constant> in all details, but it is my understanding of the technical
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background needed to program a device)</para>
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<para>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
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ISDB-Tsb segment can vary, e.g. depending on the frequency spectrum
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bandwidth available.</para>
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<para>Example: Assume 8 ISDB-Tsb connected segments are broadcasted. The
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broadcaster has several possibilities to put those channels in the
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air: Assuming a normal 13-segment ISDB-T spectrum he can align the 8
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segments from position 1-8 to 5-13 or anything in between.</para>
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<para>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.</para>
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<para>An ISDB-T channel is always centered over all sub-channels. As for
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the example above, in ISDB-Tsb it is no longer as simple as that.</para>
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<para><constant>The DTV_ISDBT_SB_SUBCHANNEL_ID</constant> parameter is used to give the
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sub-channel ID of the segment to be demodulated.</para>
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<para>Possible values: 0 .. 41, -1 (AUTO)</para>
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</section>
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<section id="DTV-ISDBT-SB-SEGMENT-IDX">
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<title><constant>DTV_ISDBT_SB_SEGMENT_IDX</constant></title>
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<para>This field only applies if <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'.</para>
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<para><constant>DTV_ISDBT_SB_SEGMENT_IDX</constant> 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.</para>
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<para>Possible values: 0 .. <constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant> - 1</para>
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<para>Note: This value cannot be determined by an automatic channel search.</para>
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</section>
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<section id="DTV-ISDBT-SB-SEGMENT-COUNT">
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<title><constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant></title>
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<para>This field only applies if <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'.</para>
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<para><constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant> gives the total count of connected ISDB-Tsb
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channels.</para>
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<para>Possible values: 1 .. 13</para>
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<para>Note: This value cannot be determined by an automatic channel search.</para>
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</section>
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<section id="isdb-hierq-layers">
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<title>Hierarchical layers</title>
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<para>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.</para>
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<para>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
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to 13 in ISDB-T.</para>
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<section id="DTV-ISDBT-LAYER-ENABLED">
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<title><constant>DTV_ISDBT_LAYER_ENABLED</constant></title>
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<para>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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<constant>DTV_ISDBT_LAYER_ENABLED</constant> to '1' forces all layers (if applicable) to be
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demodulated. This is the default.</para>
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<para>If the channel is in the partial reception mode
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(<constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> = 1) the central segment can be decoded
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independently of the other 12 segments. In that mode layer A has to
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have a <constant>SEGMENT_COUNT</constant> of 1.</para>
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<para>In ISDB-Tsb only layer A is used, it can be 1 or 3 in ISDB-Tsb
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according to <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant>. <constant>SEGMENT_COUNT</constant> must be filled
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accordingly.</para>
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<para>Possible values: 0x1, 0x2, 0x4 (|-able)</para>
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<para><constant>DTV_ISDBT_LAYER_ENABLED[0:0]</constant> - layer A</para>
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<para><constant>DTV_ISDBT_LAYER_ENABLED[1:1]</constant> - layer B</para>
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<para><constant>DTV_ISDBT_LAYER_ENABLED[2:2]</constant> - layer C</para>
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<para><constant>DTV_ISDBT_LAYER_ENABLED[31:3]</constant> unused</para>
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</section>
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<section id="DTV-ISDBT-LAYER-FEC">
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<title><constant>DTV_ISDBT_LAYER*_FEC</constant></title>
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<para>Possible values: <constant>FEC_AUTO</constant>, <constant>FEC_1_2</constant>, <constant>FEC_2_3</constant>, <constant>FEC_3_4</constant>, <constant>FEC_5_6</constant>, <constant>FEC_7_8</constant></para>
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</section>
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<section id="DTV-ISDBT-LAYER-MODULATION">
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<title><constant>DTV_ISDBT_LAYER*_MODULATION</constant></title>
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<para>Possible values: <constant>QAM_AUTO</constant>, QP<constant>SK, QAM_16</constant>, <constant>QAM_64</constant>, <constant>DQPSK</constant></para>
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<para>Note: If layer C is <constant>DQPSK</constant> layer B has to be <constant>DQPSK</constant>. If layer B is <constant>DQPSK</constant>
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and <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant>=0 layer has to be <constant>DQPSK</constant>.</para>
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</section>
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<section id="DTV-ISDBT-LAYER-SEGMENT-COUNT">
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<title><constant>DTV_ISDBT_LAYER*_SEGMENT_COUNT</constant></title>
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<para>Possible values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, -1 (AUTO)</para>
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<para>Note: Truth table for <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> and
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<constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> and <constant>LAYER</constant>*_SEGMENT_COUNT</para>
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<informaltable id="isdbt-layer_seg-cnt-table">
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<tgroup cols="6">
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<tbody>
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<row>
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<entry>PR</entry>
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<entry>SB</entry>
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<entry>Layer A width</entry>
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<entry>Layer B width</entry>
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<entry>Layer C width</entry>
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<entry>total width</entry>
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</row>
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<row>
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<entry>0</entry>
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<entry>0</entry>
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<entry>1 .. 13</entry>
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<entry>1 .. 13</entry>
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<entry>1 .. 13</entry>
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<entry>13</entry>
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</row>
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<row>
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<entry>1</entry>
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<entry>0</entry>
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<entry>1</entry>
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<entry>1 .. 13</entry>
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<entry>1 .. 13</entry>
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<entry>13</entry>
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</row>
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<row>
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<entry>0</entry>
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<entry>1</entry>
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<entry>1</entry>
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<entry>0</entry>
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<entry>0</entry>
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<entry>1</entry>
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</row>
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<row>
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<entry>1</entry>
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<entry>1</entry>
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<entry>1</entry>
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<entry>2</entry>
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<entry>0</entry>
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<entry>13</entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</section>
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<section id="DTV-ISDBT-LAYER-TIME-INTERLEAVING">
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<title><constant>DTV_ISDBT_LAYER*_TIME_INTERLEAVING</constant></title>
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<para>Possible values: 0, 1, 2, 3, -1 (AUTO)</para>
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<para>Note: The real inter-leaver depth-names depend on the mode (fft-size); the values
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here are referring to what can be found in the TMCC-structure -
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independent of the mode.</para>
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</section>
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</section>
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<section id="DTV-API-VERSION">
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<title><constant>DTV_API_VERSION</constant></title>
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<para>Returns the major/minor version of the DVB API</para>
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@ -384,124 +623,6 @@ typedef enum fe_code_rate {
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} fe_code_rate_t;
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</programlisting>
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</section>
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<section id="DTV-HIERARCHY">
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<title><constant>DTV_HIERARCHY</constant></title>
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<para>Frontend hierarchy</para>
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<programlisting>
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typedef enum fe_hierarchy {
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HIERARCHY_NONE,
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HIERARCHY_1,
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HIERARCHY_2,
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HIERARCHY_4,
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HIERARCHY_AUTO
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} fe_hierarchy_t;
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</programlisting>
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</section>
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<section id="DTV-ISDBS-TS-ID">
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<title><constant>DTV_ISDBS_TS_ID</constant></title>
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<para>Currently unused.</para>
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</section>
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<section id="DTV-FREQUENCY">
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<title><constant>DTV_FREQUENCY</constant></title>
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<para>Central frequency of the channel, in HZ.</para>
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<para>Notes:</para>
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<para>1)For ISDB-T, the channels are usually transmitted with an offset of 143kHz.
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E.g. a valid frequncy could be 474143 kHz. The stepping is bound to the bandwidth of
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the channel which is 6MHz.</para>
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<para>2)As in ISDB-Tsb the channel consists of only one or three segments the
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frequency step is 429kHz, 3*429 respectively. As for ISDB-T the
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central frequency of the channel is expected.</para>
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</section>
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<section id="DTV-BANDWIDTH-HZ">
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<title><constant>DTV_BANDWIDTH_HZ</constant></title>
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<para>Bandwidth for the channel, in HZ.</para>
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<para>Possible values:
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<constant>1712000</constant>,
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<constant>5000000</constant>,
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<constant>6000000</constant>,
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<constant>7000000</constant>,
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<constant>8000000</constant>,
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<constant>10000000</constant>.
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</para>
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<para>Notes:</para>
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<para>1) For ISDB-T it should be always 6000000Hz (6MHz)</para>
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<para>2) For ISDB-Tsb it can vary depending on the number of connected segments</para>
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<para>3) Bandwidth doesn't apply for DVB-C transmissions, as the bandwidth
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for DVB-C depends on the symbol rate</para>
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<para>4) Bandwidth in ISDB-T is fixed (6MHz) or can be easily derived from
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other parameters (DTV_ISDBT_SB_SEGMENT_IDX,
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DTV_ISDBT_SB_SEGMENT_COUNT).</para>
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<para>5) DVB-T supports 6, 7 and 8MHz.</para>
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<para>6) In addition, DVB-T2 supports 1.172, 5 and 10MHz.</para>
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</section>
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<section id="DTV-DELIVERY-SYSTEM">
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<title><constant>DTV_DELIVERY_SYSTEM</constant></title>
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<para>Specifies the type of Delivery system</para>
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<para>Possible values: </para>
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<programlisting>
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typedef enum fe_delivery_system {
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SYS_UNDEFINED,
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SYS_DVBC_ANNEX_AC,
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SYS_DVBC_ANNEX_B,
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SYS_DVBT,
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SYS_DSS,
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SYS_DVBS,
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SYS_DVBS2,
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SYS_DVBH,
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SYS_ISDBT,
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SYS_ISDBS,
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SYS_ISDBC,
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SYS_ATSC,
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SYS_ATSCMH,
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SYS_DMBTH,
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SYS_CMMB,
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SYS_DAB,
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SYS_DVBT2,
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} fe_delivery_system_t;
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</programlisting>
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</section>
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<section id="DTV-TRANSMISSION-MODE">
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<title><constant>DTV_TRANSMISSION_MODE</constant></title>
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<para>Specifies the number of carriers used by the standard</para>
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<para>Possible values are:</para>
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<programlisting>
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typedef enum fe_transmit_mode {
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TRANSMISSION_MODE_2K,
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TRANSMISSION_MODE_8K,
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TRANSMISSION_MODE_AUTO,
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TRANSMISSION_MODE_4K,
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TRANSMISSION_MODE_1K,
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TRANSMISSION_MODE_16K,
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TRANSMISSION_MODE_32K,
|
||||
} fe_transmit_mode_t;
|
||||
</programlisting>
|
||||
|
||||
<para>Notes:</para>
|
||||
<para>1) 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</para>
|
||||
|
||||
<para>2) If <constant>DTV_TRANSMISSION_MODE</constant> is set the <constant>TRANSMISSION_MODE_AUTO</constant> the
|
||||
hardware will try to find the correct FFT-size (if capable) and will
|
||||
use TMCC to fill in the missing parameters.</para>
|
||||
<para>3) DVB-T specifies 2K and 8K as valid sizes.</para>
|
||||
<para>4) DVB-T2 specifies 1K, 2K, 4K, 8K, 16K and 32K.</para>
|
||||
</section>
|
||||
|
||||
<section id="DTV-GUARD-INTERVAL">
|
||||
<title><constant>DTV_GUARD_INTERVAL</constant></title>
|
||||
|
||||
|
|
@ -525,267 +646,87 @@ typedef enum fe_guard_interval {
|
|||
in the missing parameters.</para>
|
||||
<para>2) Intervals 1/128, 19/128 and 19/256 are used only for DVB-T2 at present</para>
|
||||
</section>
|
||||
</section>
|
||||
<section id="DTV-TRANSMISSION-MODE">
|
||||
<title><constant>DTV_TRANSMISSION_MODE</constant></title>
|
||||
|
||||
<section id="isdbt">
|
||||
<title>ISDB-T frontend</title>
|
||||
<para>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:</para>
|
||||
<para>Specifies the number of carriers used by the standard</para>
|
||||
|
||||
<para>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.</para>
|
||||
<para>Possible values are:</para>
|
||||
<programlisting>
|
||||
typedef enum fe_transmit_mode {
|
||||
TRANSMISSION_MODE_2K,
|
||||
TRANSMISSION_MODE_8K,
|
||||
TRANSMISSION_MODE_AUTO,
|
||||
TRANSMISSION_MODE_4K,
|
||||
TRANSMISSION_MODE_1K,
|
||||
TRANSMISSION_MODE_16K,
|
||||
TRANSMISSION_MODE_32K,
|
||||
} fe_transmit_mode_t;
|
||||
</programlisting>
|
||||
<para>Notes:</para>
|
||||
<para>1) 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</para>
|
||||
|
||||
<para>The information given here should help application writers to know how
|
||||
to handle ISDB-T and ISDB-Tsb hardware using the Linux DVB-API.</para>
|
||||
|
||||
<para>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:</para>
|
||||
|
||||
<para>ARIB STD-B31 - "Transmission System for Digital Terrestrial
|
||||
Television Broadcasting" and</para>
|
||||
<para>ARIB TR-B14 - "Operational Guidelines for Digital Terrestrial
|
||||
Television Broadcasting".</para>
|
||||
|
||||
<para>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.</para>
|
||||
|
||||
<para>Parameters used by ISDB-T and ISDB-Tsb.</para>
|
||||
|
||||
<section id="isdbt-new-parms">
|
||||
<title>ISDB-T only parameters</title>
|
||||
|
||||
<section id="DTV-ISDBT-PARTIAL-RECEPTION">
|
||||
<title><constant>DTV_ISDBT_PARTIAL_RECEPTION</constant></title>
|
||||
|
||||
<para>If <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '0' this bit-field represents whether
|
||||
the channel is in partial reception mode or not.</para>
|
||||
|
||||
<para>If '1' <constant>DTV_ISDBT_LAYERA_*</constant> values are assigned to the center segment and
|
||||
<constant>DTV_ISDBT_LAYERA_SEGMENT_COUNT</constant> has to be '1'.</para>
|
||||
|
||||
<para>If in addition <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'
|
||||
<constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> represents whether this ISDB-Tsb channel
|
||||
is consisting of one segment and layer or three segments and two layers.</para>
|
||||
|
||||
<para>Possible values: 0, 1, -1 (AUTO)</para>
|
||||
</section>
|
||||
|
||||
<section id="DTV-ISDBT-SOUND-BROADCASTING">
|
||||
<title><constant>DTV_ISDBT_SOUND_BROADCASTING</constant></title>
|
||||
|
||||
<para>This field represents whether the other DTV_ISDBT_*-parameters are
|
||||
referring to an ISDB-T and an ISDB-Tsb channel. (See also
|
||||
<constant>DTV_ISDBT_PARTIAL_RECEPTION</constant>).</para>
|
||||
|
||||
<para>Possible values: 0, 1, -1 (AUTO)</para>
|
||||
</section>
|
||||
|
||||
<section id="DTV-ISDBT-SB-SUBCHANNEL-ID">
|
||||
<title><constant>DTV_ISDBT_SB_SUBCHANNEL_ID</constant></title>
|
||||
|
||||
<para>This field only applies if <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'.</para>
|
||||
|
||||
<para>(Note of the author: This might not be the correct description of the
|
||||
<constant>SUBCHANNEL-ID</constant> in all details, but it is my understanding of the technical
|
||||
background needed to program a device)</para>
|
||||
|
||||
<para>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.</para>
|
||||
|
||||
<para>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.</para>
|
||||
|
||||
<para>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.</para>
|
||||
|
||||
<para>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.</para>
|
||||
|
||||
<para><constant>The DTV_ISDBT_SB_SUBCHANNEL_ID</constant> parameter is used to give the
|
||||
sub-channel ID of the segment to be demodulated.</para>
|
||||
|
||||
<para>Possible values: 0 .. 41, -1 (AUTO)</para>
|
||||
</section>
|
||||
|
||||
<section id="DTV-ISDBT-SB-SEGMENT-IDX">
|
||||
|
||||
<title><constant>DTV_ISDBT_SB_SEGMENT_IDX</constant></title>
|
||||
|
||||
<para>This field only applies if <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'.</para>
|
||||
|
||||
<para><constant>DTV_ISDBT_SB_SEGMENT_IDX</constant> gives the index of the segment to be
|
||||
demodulated for an ISDB-Tsb channel where several of them are
|
||||
transmitted in the connected manner.</para>
|
||||
|
||||
<para>Possible values: 0 .. <constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant> - 1</para>
|
||||
|
||||
<para>Note: This value cannot be determined by an automatic channel search.</para>
|
||||
</section>
|
||||
|
||||
<section id="DTV-ISDBT-SB-SEGMENT-COUNT">
|
||||
<title><constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant></title>
|
||||
|
||||
<para>This field only applies if <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'.</para>
|
||||
|
||||
<para><constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant> gives the total count of connected ISDB-Tsb
|
||||
channels.</para>
|
||||
|
||||
<para>Possible values: 1 .. 13</para>
|
||||
|
||||
<para>Note: This value cannot be determined by an automatic channel search.</para>
|
||||
</section>
|
||||
|
||||
<section id="isdb-hierq-layers">
|
||||
<title>Hierarchical layers</title>
|
||||
|
||||
<para>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.</para>
|
||||
|
||||
<para>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.</para>
|
||||
|
||||
<section id="DTV-ISDBT-LAYER-ENABLED">
|
||||
<title><constant>DTV_ISDBT_LAYER_ENABLED</constant></title>
|
||||
|
||||
<para>Hierarchical reception in ISDB-T is achieved by enabling or disabling
|
||||
layers in the decoding process. Setting all bits of
|
||||
<constant>DTV_ISDBT_LAYER_ENABLED</constant> to '1' forces all layers (if applicable) to be
|
||||
demodulated. This is the default.</para>
|
||||
|
||||
<para>If the channel is in the partial reception mode
|
||||
(<constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> = 1) the central segment can be decoded
|
||||
independently of the other 12 segments. In that mode layer A has to
|
||||
have a <constant>SEGMENT_COUNT</constant> of 1.</para>
|
||||
|
||||
<para>In ISDB-Tsb only layer A is used, it can be 1 or 3 in ISDB-Tsb
|
||||
according to <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant>. <constant>SEGMENT_COUNT</constant> must be filled
|
||||
accordingly.</para>
|
||||
|
||||
<para>Possible values: 0x1, 0x2, 0x4 (|-able)</para>
|
||||
|
||||
<para><constant>DTV_ISDBT_LAYER_ENABLED[0:0]</constant> - layer A</para>
|
||||
<para><constant>DTV_ISDBT_LAYER_ENABLED[1:1]</constant> - layer B</para>
|
||||
<para><constant>DTV_ISDBT_LAYER_ENABLED[2:2]</constant> - layer C</para>
|
||||
<para><constant>DTV_ISDBT_LAYER_ENABLED[31:3]</constant> unused</para>
|
||||
</section>
|
||||
|
||||
<section id="DTV-ISDBT-LAYER-FEC">
|
||||
<title><constant>DTV_ISDBT_LAYER*_FEC</constant></title>
|
||||
|
||||
<para>Possible values: <constant>FEC_AUTO</constant>, <constant>FEC_1_2</constant>, <constant>FEC_2_3</constant>, <constant>FEC_3_4</constant>, <constant>FEC_5_6</constant>, <constant>FEC_7_8</constant></para>
|
||||
</section>
|
||||
|
||||
<section id="DTV-ISDBT-LAYER-MODULATION">
|
||||
<title><constant>DTV_ISDBT_LAYER*_MODULATION</constant></title>
|
||||
|
||||
<para>Possible values: <constant>QAM_AUTO</constant>, QP<constant>SK, QAM_16</constant>, <constant>QAM_64</constant>, <constant>DQPSK</constant></para>
|
||||
|
||||
<para>Note: If layer C is <constant>DQPSK</constant> layer B has to be <constant>DQPSK</constant>. If layer B is <constant>DQPSK</constant>
|
||||
and <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant>=0 layer has to be <constant>DQPSK</constant>.</para>
|
||||
</section>
|
||||
|
||||
<section id="DTV-ISDBT-LAYER-SEGMENT-COUNT">
|
||||
<title><constant>DTV_ISDBT_LAYER*_SEGMENT_COUNT</constant></title>
|
||||
|
||||
<para>Possible values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, -1 (AUTO)</para>
|
||||
|
||||
<para>Note: Truth table for <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> and
|
||||
<constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> and <constant>LAYER</constant>*_SEGMENT_COUNT</para>
|
||||
|
||||
<informaltable id="isdbt-layer_seg-cnt-table">
|
||||
<tgroup cols="6">
|
||||
|
||||
<tbody>
|
||||
<row>
|
||||
<entry>PR</entry>
|
||||
<entry>SB</entry>
|
||||
<entry>Layer A width</entry>
|
||||
<entry>Layer B width</entry>
|
||||
<entry>Layer C width</entry>
|
||||
<entry>total width</entry>
|
||||
</row>
|
||||
|
||||
<row>
|
||||
<entry>0</entry>
|
||||
<entry>0</entry>
|
||||
<entry>1 .. 13</entry>
|
||||
<entry>1 .. 13</entry>
|
||||
<entry>1 .. 13</entry>
|
||||
<entry>13</entry>
|
||||
</row>
|
||||
|
||||
<row>
|
||||
<entry>1</entry>
|
||||
<entry>0</entry>
|
||||
<entry>1</entry>
|
||||
<entry>1 .. 13</entry>
|
||||
<entry>1 .. 13</entry>
|
||||
<entry>13</entry>
|
||||
</row>
|
||||
|
||||
<row>
|
||||
<entry>0</entry>
|
||||
<entry>1</entry>
|
||||
<entry>1</entry>
|
||||
<entry>0</entry>
|
||||
<entry>0</entry>
|
||||
<entry>1</entry>
|
||||
</row>
|
||||
|
||||
<row>
|
||||
<entry>1</entry>
|
||||
<entry>1</entry>
|
||||
<entry>1</entry>
|
||||
<entry>2</entry>
|
||||
<entry>0</entry>
|
||||
<entry>13</entry>
|
||||
</row>
|
||||
</tbody>
|
||||
|
||||
</tgroup>
|
||||
</informaltable>
|
||||
|
||||
</section>
|
||||
|
||||
<section id="DTV-ISDBT-LAYER-TIME-INTERLEAVING">
|
||||
<title><constant>DTV_ISDBT_LAYER*_TIME_INTERLEAVING</constant></title>
|
||||
|
||||
<para>Possible values: 0, 1, 2, 3, -1 (AUTO)</para>
|
||||
|
||||
<para>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.</para>
|
||||
</section>
|
||||
</section>
|
||||
<para>2) If <constant>DTV_TRANSMISSION_MODE</constant> is set the <constant>TRANSMISSION_MODE_AUTO</constant> the
|
||||
hardware will try to find the correct FFT-size (if capable) and will
|
||||
use TMCC to fill in the missing parameters.</para>
|
||||
<para>3) DVB-T specifies 2K and 8K as valid sizes.</para>
|
||||
<para>4) DVB-T2 specifies 1K, 2K, 4K, 8K, 16K and 32K.</para>
|
||||
</section>
|
||||
<section id="dvbt2-params">
|
||||
<title>DVB-T2 parameters</title>
|
||||
|
||||
<para>This section covers parameters that apply only to the DVB-T2 delivery method. DVB-T2
|
||||
support is currently in the early stages development so expect this section to grow
|
||||
and become more detailed with time.</para>
|
||||
|
||||
<section id="DTV-DVBT2-PLP-ID">
|
||||
<title><constant>DTV_DVBT2_PLP_ID</constant></title>
|
||||
|
||||
<para>DVB-T2 supports Physical Layer Pipes (PLP) to allow transmission of
|
||||
many data types via a single multiplex. The API will soon support this
|
||||
at which point this section will be expanded.</para>
|
||||
<section id="DTV-HIERARCHY">
|
||||
<title><constant>DTV_HIERARCHY</constant></title>
|
||||
<para>Frontend hierarchy</para>
|
||||
<programlisting>
|
||||
typedef enum fe_hierarchy {
|
||||
HIERARCHY_NONE,
|
||||
HIERARCHY_1,
|
||||
HIERARCHY_2,
|
||||
HIERARCHY_4,
|
||||
HIERARCHY_AUTO
|
||||
} fe_hierarchy_t;
|
||||
</programlisting>
|
||||
</section>
|
||||
<section id="DTV-ISDBS-TS-ID">
|
||||
<title><constant>DTV_ISDBS_TS_ID</constant></title>
|
||||
<para>Currently unused.</para>
|
||||
</section>
|
||||
<section id="DTV-DVBT2-PLP-ID">
|
||||
<title><constant>DTV_DVBT2_PLP_ID</constant></title>
|
||||
<para>DVB-T2 supports Physical Layer Pipes (PLP) to allow transmission of
|
||||
many data types via a single multiplex. The API will soon support this
|
||||
at which point this section will be expanded.</para>
|
||||
</section>
|
||||
<section id="frontend-property-dtv-types">
|
||||
<title>Properties used by each DTV type</title>
|
||||
<section id="isdbt">
|
||||
<title>ISDB-T frontend</title>
|
||||
<para>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:</para>
|
||||
<para>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.</para>
|
||||
<para>The information given here should help application writers to know how
|
||||
to handle ISDB-T and ISDB-Tsb hardware using the Linux DVB-API.</para>
|
||||
<para>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:</para>
|
||||
<para>ARIB STD-B31 - "Transmission System for Digital Terrestrial
|
||||
Television Broadcasting" and</para>
|
||||
<para>ARIB TR-B14 - "Operational Guidelines for Digital Terrestrial
|
||||
Television Broadcasting".</para>
|
||||
<para>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.</para>
|
||||
</section>
|
||||
<section id="dvbt2-params">
|
||||
<title>DVB-T2 parameters</title>
|
||||
<para>This section covers parameters that apply only to the DVB-T2 delivery method. DVB-T2
|
||||
support is currently in the early stages development so expect this section to grow
|
||||
and become more detailed with time.</para>
|
||||
</section>
|
||||
</section>
|
||||
</section>
|
||||
|
|
|
|||
Reference in New Issue