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<section id="frontend-properties">
<title>DVB Frontend properties</title>
<para>Tuning into a Digital TV physical channel and starting decoding it
requires changing a set of parameters, in order to control the
tuner, the demodulator, the Linear Low-noise Amplifier (LNA) and to set the
antenna subsystem via Satellite Equipment Control (SEC), on satellite
systems. The actual parameters are specific to each particular digital
TV standards, and may change as the digital TV specs evolves.</para>
<para>In the past, the strategy used was to have a union with the parameters
needed to tune for DVB-S, DVB-C, DVB-T and ATSC delivery systems grouped
there. The problem is that, as the second generation standards appeared,
those structs were not big enough to contain the additional parameters.
Also, the union didn't have any space left to be expanded without breaking
userspace. So, the decision was to deprecate the legacy union/struct based
approach, in favor of a properties set approach.</para>
<para>NOTE: on Linux DVB API version 3, setting a frontend were done via
<link linkend="dvb-frontend-parameters">struct <constant>dvb_frontend_parameters</constant></link>.
This got replaced on version 5 (also called "S2API", as this API were
added originally_enabled to provide support for DVB-S2), because the old
API has a very limited support to new standards and new hardware. This
section describes the new and recommended way to set the frontend, with
suppports all digital TV delivery systems.</para>
<para>Example: with the properties based approach, in order to set the tuner
to a DVB-C channel at 651 kHz, modulated with 256-QAM, FEC 3/4 and symbol
rate of 5.217 Mbauds, those properties should be sent to
<link linkend="FE_GET_PROPERTY"><constant>FE_SET_PROPERTY</constant></link> ioctl:</para>
<itemizedlist>
<listitem><para>&DTV-DELIVERY-SYSTEM; = SYS_DVBC_ANNEX_A</para></listitem>
<listitem><para>&DTV-FREQUENCY; = 651000000</para></listitem>
<listitem><para>&DTV-MODULATION; = QAM_256</para></listitem>
<listitem><para>&DTV-INVERSION; = INVERSION_AUTO</para></listitem>
<listitem><para>&DTV-SYMBOL-RATE; = 5217000</para></listitem>
<listitem><para>&DTV-INNER-FEC; = FEC_3_4</para></listitem>
<listitem><para>&DTV-TUNE;</para></listitem>
</itemizedlist>
<para>The code that would do the above is:</para>
<programlisting>
#include &lt;stdio.h&gt;
#include &lt;fcntl.h&gt;
#include &lt;sys/ioctl.h&gt;
#include &lt;linux/dvb/frontend.h&gt;
static struct dtv_property props[] = {
{ .cmd = DTV_DELIVERY_SYSTEM, .u.data = SYS_DVBC_ANNEX_A },
{ .cmd = DTV_FREQUENCY, .u.data = 651000000 },
{ .cmd = DTV_MODULATION, .u.data = QAM_256 },
{ .cmd = DTV_INVERSION, .u.data = INVERSION_AUTO },
{ .cmd = DTV_SYMBOL_RATE, .u.data = 5217000 },
{ .cmd = DTV_INNER_FEC, .u.data = FEC_3_4 },
{ .cmd = DTV_TUNE }
};
static struct dtv_properties dtv_prop = {
.num = 6, .props = props
};
int main(void)
{
int fd = open("/dev/dvb/adapter0/frontend0", O_RDWR);
if (!fd) {
perror ("open");
return -1;
}
if (ioctl(fd, FE_SET_PROPERTY, &amp;dtv_prop) == -1) {
perror("ioctl");
return -1;
}
printf("Frontend set\n");
return 0;
}
</programlisting>
<para>NOTE: While it is possible to directly call the Kernel code like the
above example, it is strongly recommended to use
<ulink url="https://linuxtv.org/docs/libdvbv5/index.html">libdvbv5</ulink>,
as it provides abstraction to work with the supported digital TV standards
and provides methods for usual operations like program scanning and to
read/write channel descriptor files.</para>
<section id="dtv-stats">
<title>struct <structname>dtv_stats</structname></title>
<programlisting>
struct dtv_stats {
__u8 scale; /* enum fecap_scale_params type */
union {
__u64 uvalue; /* for counters and relative scales */
__s64 svalue; /* for 1/1000 dB measures */
};
} __packed;
</programlisting>
</section>
<section id="dtv-fe-stats">
<title>struct <structname>dtv_fe_stats</structname></title>
<programlisting>
#define MAX_DTV_STATS 4
struct dtv_fe_stats {
__u8 len;
&dtv-stats; stat[MAX_DTV_STATS];
} __packed;
</programlisting>
</section>
<section id="dtv-property">
<title>struct <structname>dtv_property</structname></title>
<programlisting>
/* Reserved fields should be set to 0 */
struct dtv_property {
__u32 cmd;
__u32 reserved[3];
union {
__u32 data;
&dtv-fe-stats; st;
struct {
__u8 data[32];
__u32 len;
__u32 reserved1[3];
void *reserved2;
} buffer;
} u;
int result;
} __attribute__ ((packed));
/* num of properties cannot exceed DTV_IOCTL_MAX_MSGS per ioctl */
#define DTV_IOCTL_MAX_MSGS 64
</programlisting>
</section>
<section id="dtv-properties">
<title>struct <structname>dtv_properties</structname></title>
<programlisting>
struct dtv_properties {
__u32 num;
&dtv-property; *props;
};
</programlisting>
</section>
<section>
<title>Property types</title>
<para>
On <link linkend="FE_GET_PROPERTY">FE_GET_PROPERTY and FE_SET_PROPERTY</link>,
the actual action is determined by the dtv_property cmd/data pairs. With one single ioctl, is possible to
get/set up to 64 properties. The actual meaning of each property is described on the next sections.
</para>
<para>The available frontend property types are shown on the next section.</para>
</section>
<section id="fe_property_parameters">
<title>Digital TV property parameters</title>
<section id="DTV-UNDEFINED">
<title><constant>DTV_UNDEFINED</constant></title>
<para>Used internally. A GET/SET operation for it won't change or return anything.</para>
</section>
<section id="DTV-TUNE">
<title><constant>DTV_TUNE</constant></title>
<para>Interpret the cache of data, build either a traditional frontend tunerequest so we can pass validation in the <constant>FE_SET_FRONTEND</constant> ioctl.</para>
</section>
<section id="DTV-CLEAR">
<title><constant>DTV_CLEAR</constant></title>
<para>Reset a cache of data specific to the frontend here. This does not effect hardware.</para>
</section>
<section id="DTV-FREQUENCY">
<title><constant>DTV_FREQUENCY</constant></title>
<para>Central frequency of the channel.</para>
<para>Notes:</para>
<para>1)For satellite delivery systems, it is measured in kHz.
For the other ones, it is measured in Hz.</para>
<para>2)For ISDB-T, the channels are usually transmitted with an offset of 143kHz.
E.g. a valid frequency could be 474143 kHz. The stepping is bound to the bandwidth of
the channel which is 6MHz.</para>
<para>3)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.</para>
</section>
<section id="DTV-MODULATION">
<title><constant>DTV_MODULATION</constant></title>
<para>Specifies the frontend modulation type for delivery systems that supports
more than one modulation type. The modulation can be one of the types
defined by &fe-modulation;.</para>
<section id="fe-modulation-t">
<title>Modulation property</title>
<para>Most of the digital TV standards currently offers more than one possible
modulation (sometimes called as "constellation" on some standards). This
enum contains the values used by the Kernel. Please note that not all
modulations are supported by a given standard.</para>
<table pgwide="1" frame="none" id="fe-modulation">
<title>enum fe_modulation</title>
<tgroup cols="2">
&cs-def;
<thead>
<row>
<entry>ID</entry>
<entry>Description</entry>
</row>
</thead>
<tbody valign="top">
<row>
<entry id="QPSK"><constant>QPSK</constant></entry>
<entry>QPSK modulation</entry>
</row><row>
<entry id="QAM-16"><constant>QAM_16</constant></entry>
<entry>16-QAM modulation</entry>
</row><row>
<entry id="QAM-32"><constant>QAM_32</constant></entry>
<entry>32-QAM modulation</entry>
</row><row>
<entry id="QAM-64"><constant>QAM_64</constant></entry>
<entry>64-QAM modulation</entry>
</row><row>
<entry id="QAM-128"><constant>QAM_128</constant></entry>
<entry>128-QAM modulation</entry>
</row><row>
<entry id="QAM-256"><constant>QAM_256</constant></entry>
<entry>256-QAM modulation</entry>
</row><row>
<entry id="QAM-AUTO"><constant>QAM_AUTO</constant></entry>
<entry>Autodetect QAM modulation</entry>
</row><row>
<entry id="VSB-8"><constant>VSB_8</constant></entry>
<entry>8-VSB modulation</entry>
</row><row>
<entry id="VSB-16"><constant>VSB_16</constant></entry>
<entry>16-VSB modulation</entry>
</row><row>
<entry id="PSK-8"><constant>PSK_8</constant></entry>
<entry>8-PSK modulation</entry>
</row><row>
<entry id="APSK-16"><constant>APSK_16</constant></entry>
<entry>16-APSK modulation</entry>
</row><row>
<entry id="APSK-32"><constant>APSK_32</constant></entry>
<entry>32-APSK modulation</entry>
</row><row>
<entry id="DQPSK"><constant>DQPSK</constant></entry>
<entry>DQPSK modulation</entry>
</row><row>
<entry id="QAM-4-NR"><constant>QAM_4_NR</constant></entry>
<entry>4-QAM-NR modulation</entry>
</row>
</tbody>
</tgroup>
</table>
</section>
</section>
<section id="DTV-BANDWIDTH-HZ">
<title><constant>DTV_BANDWIDTH_HZ</constant></title>
<para>Bandwidth for the channel, in HZ.</para>
<para>Possible values:
<constant>1712000</constant>,
<constant>5000000</constant>,
<constant>6000000</constant>,
<constant>7000000</constant>,
<constant>8000000</constant>,
<constant>10000000</constant>.
</para>
<para>Notes:</para>
<para>1) For ISDB-T it should be always 6000000Hz (6MHz)</para>
<para>2) For ISDB-Tsb it can vary depending on the number of connected segments</para>
<para>3) Bandwidth doesn't apply for DVB-C transmissions, as the bandwidth
for DVB-C depends on the symbol rate</para>
<para>4) 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).</para>
<para>5) DVB-T supports 6, 7 and 8MHz.</para>
<para>6) In addition, DVB-T2 supports 1.172, 5 and 10MHz.</para>
</section>
<section id="DTV-INVERSION">
<title><constant>DTV_INVERSION</constant></title>
<para>Specifies if the frontend should do spectral inversion or not.</para>
<section id="fe-spectral-inversion-t">
<title>enum fe_modulation: Frontend spectral inversion</title>
<para>This parameter indicates if spectral inversion should be presumed or not.
In the automatic setting (<constant>INVERSION_AUTO</constant>) the hardware
will try to figure out the correct setting by itself. If the hardware
doesn't support, the DVB core will try to lock at the carrier first with
inversion off. If it fails, it will try to enable inversion.
</para>
<table pgwide="1" frame="none" id="fe-spectral-inversion">
<title>enum fe_modulation</title>
<tgroup cols="2">
&cs-def;
<thead>
<row>
<entry>ID</entry>
<entry>Description</entry>
</row>
</thead>
<tbody valign="top">
<row>
<entry id="INVERSION-OFF"><constant>INVERSION_OFF</constant></entry>
<entry>Don't do spectral band inversion.</entry>
</row><row>
<entry id="INVERSION-ON"><constant>INVERSION_ON</constant></entry>
<entry>Do spectral band inversion.</entry>
</row><row>
<entry id="INVERSION-AUTO"><constant>INVERSION_AUTO</constant></entry>
<entry>Autodetect spectral band inversion.</entry>
</row>
</tbody>
</tgroup>
</table>
</section>
</section>
<section id="DTV-DISEQC-MASTER">
<title><constant>DTV_DISEQC_MASTER</constant></title>
<para>Currently not implemented.</para>
</section>
<section id="DTV-SYMBOL-RATE">
<title><constant>DTV_SYMBOL_RATE</constant></title>
<para>Digital TV symbol rate, in bauds (symbols/second). Used on cable standards.</para>
</section>
<section id="DTV-INNER-FEC">
<title><constant>DTV_INNER_FEC</constant></title>
<para>Used cable/satellite transmissions. The acceptable values are:
</para>
<section id="fe-code-rate-t">
<title>enum fe_code_rate: type of the Forward Error Correction.</title>
<table pgwide="1" frame="none" id="fe-code-rate">
<title>enum fe_code_rate</title>
<tgroup cols="2">
&cs-def;
<thead>
<row>
<entry>ID</entry>
<entry>Description</entry>
</row>
</thead>
<tbody valign="top">
<row>
<entry id="FEC-NONE"><constant>FEC_NONE</constant></entry>
<entry>No Forward Error Correction Code</entry>
</row><row>
<entry id="FEC-AUTO"><constant>FEC_AUTO</constant></entry>
<entry>Autodetect Error Correction Code</entry>
</row><row>
<entry id="FEC-1-2"><constant>FEC_1_2</constant></entry>
<entry>Forward Error Correction Code 1/2</entry>
</row><row>
<entry id="FEC-2-3"><constant>FEC_2_3</constant></entry>
<entry>Forward Error Correction Code 2/3</entry>
</row><row>
<entry id="FEC-3-4"><constant>FEC_3_4</constant></entry>
<entry>Forward Error Correction Code 3/4</entry>
</row><row>
<entry id="FEC-4-5"><constant>FEC_4_5</constant></entry>
<entry>Forward Error Correction Code 4/5</entry>
</row><row>
<entry id="FEC-5-6"><constant>FEC_5_6</constant></entry>
<entry>Forward Error Correction Code 5/6</entry>
</row><row>
<entry id="FEC-6-7"><constant>FEC_6_7</constant></entry>
<entry>Forward Error Correction Code 6/7</entry>
</row><row>
<entry id="FEC-7-8"><constant>FEC_7_8</constant></entry>
<entry>Forward Error Correction Code 7/8</entry>
</row><row>
<entry id="FEC-8-9"><constant>FEC_8_9</constant></entry>
<entry>Forward Error Correction Code 8/9</entry>
</row><row>
<entry id="FEC-9-10"><constant>FEC_9_10</constant></entry>
<entry>Forward Error Correction Code 9/10</entry>
</row><row>
<entry id="FEC-2-5"><constant>FEC_2_5</constant></entry>
<entry>Forward Error Correction Code 2/5</entry>
</row><row>
<entry id="FEC-3-5"><constant>FEC_3_5</constant></entry>
<entry>Forward Error Correction Code 3/5</entry>
</row>
</tbody>
</tgroup>
</table>
</section>
</section>
<section id="DTV-VOLTAGE">
<title><constant>DTV_VOLTAGE</constant></title>
<para>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.</para>
<table pgwide="1" frame="none" id="fe-sec-voltage">
<title id="fe-sec-voltage-t">enum fe_sec_voltage</title>
<tgroup cols="2">
&cs-def;
<thead>
<row>
<entry>ID</entry>
<entry>Description</entry>
</row>
</thead>
<tbody valign="top">
<row>
<entry align="char" id="SEC-VOLTAGE-13"><constant>SEC_VOLTAGE_13</constant></entry>
<entry align="char">Set DC voltage level to 13V</entry>
</row><row>
<entry align="char" id="SEC-VOLTAGE-18"><constant>SEC_VOLTAGE_18</constant></entry>
<entry align="char">Set DC voltage level to 18V</entry>
</row><row>
<entry align="char" id="SEC-VOLTAGE-OFF"><constant>SEC_VOLTAGE_OFF</constant></entry>
<entry align="char">Don't send any voltage to the antenna</entry>
</row>
</tbody>
</tgroup>
</table>
</section>
<section id="DTV-TONE">
<title><constant>DTV_TONE</constant></title>
<para>Currently not used.</para>
</section>
<section id="DTV-PILOT">
<title><constant>DTV_PILOT</constant></title>
<para>Sets DVB-S2 pilot</para>
<section id="fe-pilot-t">
<title>fe_pilot type</title>
<table pgwide="1" frame="none" id="fe-pilot">
<title>enum fe_pilot</title>
<tgroup cols="2">
&cs-def;
<thead>
<row>
<entry>ID</entry>
<entry>Description</entry>
</row>
</thead>
<tbody valign="top">
<row>
<entry align="char" id="PILOT-ON"><constant>PILOT_ON</constant></entry>
<entry align="char">Pilot tones enabled</entry>
</row><row>
<entry align="char" id="PILOT-OFF"><constant>PILOT_OFF</constant></entry>
<entry align="char">Pilot tones disabled</entry>
</row><row>
<entry align="char" id="PILOT-AUTO"><constant>PILOT_AUTO</constant></entry>
<entry align="char">Autodetect pilot tones</entry>
</row>
</tbody>
</tgroup>
</table>
</section>
</section>
<section id="DTV-ROLLOFF">
<title><constant>DTV_ROLLOFF</constant></title>
<para>Sets DVB-S2 rolloff</para>
<section id="fe-rolloff-t">
<title>fe_rolloff type</title>
<table pgwide="1" frame="none" id="fe-rolloff">
<title>enum fe_rolloff</title>
<tgroup cols="2">
&cs-def;
<thead>
<row>
<entry>ID</entry>
<entry>Description</entry>
</row>
</thead>
<tbody valign="top">
<row>
<entry align="char" id="ROLLOFF-35"><constant>ROLLOFF_35</constant></entry>
<entry align="char">Roloff factor: &alpha;=35%</entry>
</row><row>
<entry align="char" id="ROLLOFF-20"><constant>ROLLOFF_20</constant></entry>
<entry align="char">Roloff factor: &alpha;=20%</entry>
</row><row>
<entry align="char" id="ROLLOFF-25"><constant>ROLLOFF_25</constant></entry>
<entry align="char">Roloff factor: &alpha;=25%</entry>
</row><row>
<entry align="char" id="ROLLOFF-AUTO"><constant>ROLLOFF_AUTO</constant></entry>
<entry align="char">Auto-detect the roloff factor.</entry>
</row>
</tbody>
</tgroup>
</table>
</section>
</section>
<section id="DTV-DISEQC-SLAVE-REPLY">
<title><constant>DTV_DISEQC_SLAVE_REPLY</constant></title>
<para>Currently not implemented.</para>
</section>
<section id="DTV-FE-CAPABILITY-COUNT">
<title><constant>DTV_FE_CAPABILITY_COUNT</constant></title>
<para>Currently not implemented.</para>
</section>
<section id="DTV-FE-CAPABILITY">
<title><constant>DTV_FE_CAPABILITY</constant></title>
<para>Currently not implemented.</para>
</section>
<section id="DTV-DELIVERY-SYSTEM">
<title><constant>DTV_DELIVERY_SYSTEM</constant></title>
<para>Specifies the type of Delivery system</para>
<section id="fe-delivery-system-t">
<title>fe_delivery_system type</title>
<para>Possible values: </para>
<table pgwide="1" frame="none" id="fe-delivery-system">
<title>enum fe_delivery_system</title>
<tgroup cols="2">
&cs-def;
<thead>
<row>
<entry>ID</entry>
<entry>Description</entry>
</row>
</thead>
<tbody valign="top">
<row>
<entry id="SYS-UNDEFINED"><constant>SYS_UNDEFINED</constant></entry>
<entry>Undefined standard. Generally, indicates an error</entry>
</row><row>
<entry id="SYS-DVBC-ANNEX-A"><constant>SYS_DVBC_ANNEX_A</constant></entry>
<entry>Cable TV: DVB-C following ITU-T J.83 Annex A spec</entry>
</row><row>
<entry id="SYS-DVBC-ANNEX-B"><constant>SYS_DVBC_ANNEX_B</constant></entry>
<entry>Cable TV: DVB-C following ITU-T J.83 Annex B spec (ClearQAM)</entry>
</row><row>
<entry id="SYS-DVBC-ANNEX-C"><constant>SYS_DVBC_ANNEX_C</constant></entry>
<entry>Cable TV: DVB-C following ITU-T J.83 Annex C spec</entry>
</row><row>
<entry id="SYS-ISDBC"><constant>SYS_ISDBC</constant></entry>
<entry>Cable TV: ISDB-C (no drivers yet)</entry>
</row><row>
<entry id="SYS-DVBT"><constant>SYS_DVBT</constant></entry>
<entry>Terrestral TV: DVB-T</entry>
</row><row>
<entry id="SYS-DVBT2"><constant>SYS_DVBT2</constant></entry>
<entry>Terrestral TV: DVB-T2</entry>
</row><row>
<entry id="SYS-ISDBT"><constant>SYS_ISDBT</constant></entry>
<entry>Terrestral TV: ISDB-T</entry>
</row><row>
<entry id="SYS-ATSC"><constant>SYS_ATSC</constant></entry>
<entry>Terrestral TV: ATSC</entry>
</row><row>
<entry id="SYS-ATSCMH"><constant>SYS_ATSCMH</constant></entry>
<entry>Terrestral TV (mobile): ATSC-M/H</entry>
</row><row>
<entry id="SYS-DTMB"><constant>SYS_DTMB</constant></entry>
<entry>Terrestrial TV: DTMB</entry>
</row><row>
<entry id="SYS-DVBS"><constant>SYS_DVBS</constant></entry>
<entry>Satellite TV: DVB-S</entry>
</row><row>
<entry id="SYS-DVBS2"><constant>SYS_DVBS2</constant></entry>
<entry>Satellite TV: DVB-S2</entry>
</row><row>
<entry id="SYS-TURBO"><constant>SYS_TURBO</constant></entry>
<entry>Satellite TV: DVB-S Turbo</entry>
</row><row>
<entry id="SYS-ISDBS"><constant>SYS_ISDBS</constant></entry>
<entry>Satellite TV: ISDB-S</entry>
</row><row>
<entry id="SYS-DAB"><constant>SYS_DAB</constant></entry>
<entry>Digital audio: DAB (not fully supported)</entry>
</row><row>
<entry id="SYS-DSS"><constant>SYS_DSS</constant></entry>
<entry>Satellite TV:"DSS (not fully supported)</entry>
</row><row>
<entry id="SYS-CMMB"><constant>SYS_CMMB</constant></entry>
<entry>Terrestral TV (mobile):CMMB (not fully supported)</entry>
</row><row>
<entry id="SYS-DVBH"><constant>SYS_DVBH</constant></entry>
<entry>Terrestral TV (mobile): DVB-H (standard deprecated)</entry>
</row>
</tbody>
</tgroup>
</table>
</section>
</section>
<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><constant>DTV-ISDBT-LAYER*</constant> parameters</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>
<para>There are 3 parameter sets, for Layers A, B and C.</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>Valid values: 0, 1, 2, 4, -1 (AUTO)</para>
<para>when DTV_ISDBT_SOUND_BROADCASTING is active, value 8 is also valid.</para>
<para>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.</para>
<informaltable id="isdbt-layer-interleaving-table">
<tgroup cols="4" align="center">
<tbody>
<row>
<entry>DTV_ISDBT_LAYER*_TIME_INTERLEAVING</entry>
<entry>Mode 1 (2K FFT)</entry>
<entry>Mode 2 (4K FFT)</entry>
<entry>Mode 3 (8K FFT)</entry>
</row>
<row>
<entry>0</entry>
<entry>0</entry>
<entry>0</entry>
<entry>0</entry>
</row>
<row>
<entry>1</entry>
<entry>4</entry>
<entry>2</entry>
<entry>1</entry>
</row>
<row>
<entry>2</entry>
<entry>8</entry>
<entry>4</entry>
<entry>2</entry>
</row>
<row>
<entry>4</entry>
<entry>16</entry>
<entry>8</entry>
<entry>4</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</section>
<section id="DTV-ATSCMH-FIC-VER">
<title><constant>DTV_ATSCMH_FIC_VER</constant></title>
<para>Version number of the FIC (Fast Information Channel) signaling data.</para>
<para>FIC is used for relaying information to allow rapid service acquisition by the receiver.</para>
<para>Possible values: 0, 1, 2, 3, ..., 30, 31</para>
</section>
<section id="DTV-ATSCMH-PARADE-ID">
<title><constant>DTV_ATSCMH_PARADE_ID</constant></title>
<para>Parade identification number</para>
<para>A parade is a collection of up to eight MH groups, conveying one or two ensembles.</para>
<para>Possible values: 0, 1, 2, 3, ..., 126, 127</para>
</section>
<section id="DTV-ATSCMH-NOG">
<title><constant>DTV_ATSCMH_NOG</constant></title>
<para>Number of MH groups per MH subframe for a designated parade.</para>
<para>Possible values: 1, 2, 3, 4, 5, 6, 7, 8</para>
</section>
<section id="DTV-ATSCMH-TNOG">
<title><constant>DTV_ATSCMH_TNOG</constant></title>
<para>Total number of MH groups including all MH groups belonging to all MH parades in one MH subframe.</para>
<para>Possible values: 0, 1, 2, 3, ..., 30, 31</para>
</section>
<section id="DTV-ATSCMH-SGN">
<title><constant>DTV_ATSCMH_SGN</constant></title>
<para>Start group number.</para>
<para>Possible values: 0, 1, 2, 3, ..., 14, 15</para>
</section>
<section id="DTV-ATSCMH-PRC">
<title><constant>DTV_ATSCMH_PRC</constant></title>
<para>Parade repetition cycle.</para>
<para>Possible values: 1, 2, 3, 4, 5, 6, 7, 8</para>
</section>
<section id="DTV-ATSCMH-RS-FRAME-MODE">
<title><constant>DTV_ATSCMH_RS_FRAME_MODE</constant></title>
<para>Reed Solomon (RS) frame mode.</para>
<para>Possible values are:</para>
<table pgwide="1" frame="none" id="atscmh-rs-frame-mode">
<title>enum atscmh_rs_frame_mode</title>
<tgroup cols="2">
&cs-def;
<thead>
<row>
<entry>ID</entry>
<entry>Description</entry>
</row>
</thead>
<tbody valign="top">
<row>
<entry id="ATSCMH-RSFRAME-PRI-ONLY"><constant>ATSCMH_RSFRAME_PRI_ONLY</constant></entry>
<entry>Single Frame: There is only a primary RS Frame for all
Group Regions.</entry>
</row><row>
<entry id="ATSCMH-RSFRAME-PRI-SEC"><constant>ATSCMH_RSFRAME_PRI_SEC</constant></entry>
<entry>Dual Frame: There are two separate RS Frames: Primary RS
Frame for Group Region A and B and Secondary RS Frame for Group
Region C and D.</entry>
</row>
</tbody>
</tgroup>
</table>
</section>
<section id="DTV-ATSCMH-RS-FRAME-ENSEMBLE">
<title><constant>DTV_ATSCMH_RS_FRAME_ENSEMBLE</constant></title>
<para>Reed Solomon(RS) frame ensemble.</para>
<para>Possible values are:</para>
<table pgwide="1" frame="none" id="atscmh-rs-frame-ensemble">
<title>enum atscmh_rs_frame_ensemble</title>
<tgroup cols="2">
&cs-def;
<thead>
<row>
<entry>ID</entry>
<entry>Description</entry>
</row>
</thead>
<tbody valign="top">
<row>
<entry id="ATSCMH-RSFRAME-ENS-PRI"><constant>ATSCMH_RSFRAME_ENS_PRI</constant></entry>
<entry>Primary Ensemble.</entry>
</row><row>
<entry id="ATSCMH-RSFRAME-ENS-SEC"><constant>AATSCMH_RSFRAME_PRI_SEC</constant></entry>
<entry>Secondary Ensemble.</entry>
</row><row>
<entry id="ATSCMH-RSFRAME-RES"><constant>AATSCMH_RSFRAME_RES</constant></entry>
<entry>Reserved. Shouldn't be used.</entry>
</row>
</tbody>
</tgroup>
</table>
</section>
<section id="DTV-ATSCMH-RS-CODE-MODE-PRI">
<title><constant>DTV_ATSCMH_RS_CODE_MODE_PRI</constant></title>
<para>Reed Solomon (RS) code mode (primary).</para>
<para>Possible values are:</para>
<table pgwide="1" frame="none" id="atscmh-rs-code-mode">
<title>enum atscmh_rs_code_mode</title>
<tgroup cols="2">
&cs-def;
<thead>
<row>
<entry>ID</entry>
<entry>Description</entry>
</row>
</thead>
<tbody valign="top">
<row>
<entry id="ATSCMH-RSCODE-211-187"><constant>ATSCMH_RSCODE_211_187</constant></entry>
<entry>Reed Solomon code (211,187).</entry>
</row><row>
<entry id="ATSCMH-RSCODE-223-187"><constant>ATSCMH_RSCODE_223_187</constant></entry>
<entry>Reed Solomon code (223,187).</entry>
</row><row>
<entry id="ATSCMH-RSCODE-235-187"><constant>ATSCMH_RSCODE_235_187</constant></entry>
<entry>Reed Solomon code (235,187).</entry>
</row><row>
<entry id="ATSCMH-RSCODE-RES"><constant>ATSCMH_RSCODE_RES</constant></entry>
<entry>Reserved. Shouldn't be used.</entry>
</row>
</tbody>
</tgroup>
</table>
</section>
<section id="DTV-ATSCMH-RS-CODE-MODE-SEC">
<title><constant>DTV_ATSCMH_RS_CODE_MODE_SEC</constant></title>
<para>Reed Solomon (RS) code mode (secondary).</para>
<para>Possible values are the same as documented on
&atscmh-rs-code-mode;:</para>
</section>
<section id="DTV-ATSCMH-SCCC-BLOCK-MODE">
<title><constant>DTV_ATSCMH_SCCC_BLOCK_MODE</constant></title>
<para>Series Concatenated Convolutional Code Block Mode.</para>
<para>Possible values are:</para>
<table pgwide="1" frame="none" id="atscmh-sccc-block-mode">
<title>enum atscmh_scc_block_mode</title>
<tgroup cols="2">
&cs-def;
<thead>
<row>
<entry>ID</entry>
<entry>Description</entry>
</row>
</thead>
<tbody valign="top">
<row>
<entry id="ATSCMH-SCCC-BLK-SEP"><constant>ATSCMH_SCCC_BLK_SEP</constant></entry>
<entry>Separate SCCC: the SCCC outer code mode shall be set independently
for each Group Region (A, B, C, D)</entry>
</row><row>
<entry id="ATSCMH-SCCC-BLK-COMB"><constant>ATSCMH_SCCC_BLK_COMB</constant></entry>
<entry>Combined SCCC: all four Regions shall have the same SCCC outer
code mode.</entry>
</row><row>
<entry id="ATSCMH-SCCC-BLK-RES"><constant>ATSCMH_SCCC_BLK_RES</constant></entry>
<entry>Reserved. Shouldn't be used.</entry>
</row>
</tbody>
</tgroup>
</table>
</section>
<section id="DTV-ATSCMH-SCCC-CODE-MODE-A">
<title><constant>DTV_ATSCMH_SCCC_CODE_MODE_A</constant></title>
<para>Series Concatenated Convolutional Code Rate.</para>
<para>Possible values are:</para>
<table pgwide="1" frame="none" id="atscmh-sccc-code-mode">
<title>enum atscmh_sccc_code_mode</title>
<tgroup cols="2">
&cs-def;
<thead>
<row>
<entry>ID</entry>
<entry>Description</entry>
</row>
</thead>
<tbody valign="top">
<row>
<entry id="ATSCMH-SCCC-CODE-HLF"><constant>ATSCMH_SCCC_CODE_HLF</constant></entry>
<entry>The outer code rate of a SCCC Block is 1/2 rate.</entry>
</row><row>
<entry id="ATSCMH-SCCC-CODE-QTR"><constant>ATSCMH_SCCC_CODE_QTR</constant></entry>
<entry>The outer code rate of a SCCC Block is 1/4 rate.</entry>
</row><row>
<entry id="ATSCMH-SCCC-CODE-RES"><constant>ATSCMH_SCCC_CODE_RES</constant></entry>
<entry>to be documented.</entry>
</row>
</tbody>
</tgroup>
</table>
</section>
<section id="DTV-ATSCMH-SCCC-CODE-MODE-B">
<title><constant>DTV_ATSCMH_SCCC_CODE_MODE_B</constant></title>
<para>Series Concatenated Convolutional Code Rate.</para>
<para>Possible values are the same as documented on
&atscmh-sccc-code-mode;.</para>
</section>
<section id="DTV-ATSCMH-SCCC-CODE-MODE-C">
<title><constant>DTV_ATSCMH_SCCC_CODE_MODE_C</constant></title>
<para>Series Concatenated Convolutional Code Rate.</para>
<para>Possible values are the same as documented on
&atscmh-sccc-code-mode;.</para>
</section>
<section id="DTV-ATSCMH-SCCC-CODE-MODE-D">
<title><constant>DTV_ATSCMH_SCCC_CODE_MODE_D</constant></title>
<para>Series Concatenated Convolutional Code Rate.</para>
<para>Possible values are the same as documented on
&atscmh-sccc-code-mode;.</para>
</section>
</section>
<section id="DTV-API-VERSION">
<title><constant>DTV_API_VERSION</constant></title>
<para>Returns the major/minor version of the DVB API</para>
</section>
<section id="DTV-CODE-RATE-HP">
<title><constant>DTV_CODE_RATE_HP</constant></title>
<para>Used on terrestrial transmissions. The acceptable values are
the ones described at &fe-transmit-mode-t;.
</para>
</section>
<section id="DTV-CODE-RATE-LP">
<title><constant>DTV_CODE_RATE_LP</constant></title>
<para>Used on terrestrial transmissions. The acceptable values are
the ones described at &fe-transmit-mode-t;.
</para>
</section>
<section id="DTV-GUARD-INTERVAL">
<title><constant>DTV_GUARD_INTERVAL</constant></title>
<para>Possible values are:</para>
<section id="fe-guard-interval-t">
<title>Modulation guard interval</title>
<table pgwide="1" frame="none" id="fe-guard-interval">
<title>enum fe_guard_interval</title>
<tgroup cols="2">
&cs-def;
<thead>
<row>
<entry>ID</entry>
<entry>Description</entry>
</row>
</thead>
<tbody valign="top">
<row>
<entry id="GUARD-INTERVAL-AUTO"><constant>GUARD_INTERVAL_AUTO</constant></entry>
<entry>Autodetect the guard interval</entry>
</row><row>
<entry id="GUARD-INTERVAL-1-128"><constant>GUARD_INTERVAL_1_128</constant></entry>
<entry>Guard interval 1/128</entry>
</row><row>
<entry id="GUARD-INTERVAL-1-32"><constant>GUARD_INTERVAL_1_32</constant></entry>
<entry>Guard interval 1/32</entry>
</row><row>
<entry id="GUARD-INTERVAL-1-16"><constant>GUARD_INTERVAL_1_16</constant></entry>
<entry>Guard interval 1/16</entry>
</row><row>
<entry id="GUARD-INTERVAL-1-8"><constant>GUARD_INTERVAL_1_8</constant></entry>
<entry>Guard interval 1/8</entry>
</row><row>
<entry id="GUARD-INTERVAL-1-4"><constant>GUARD_INTERVAL_1_4</constant></entry>
<entry>Guard interval 1/4</entry>
</row><row>
<entry id="GUARD-INTERVAL-19-128"><constant>GUARD_INTERVAL_19_128</constant></entry>
<entry>Guard interval 19/128</entry>
</row><row>
<entry id="GUARD-INTERVAL-19-256"><constant>GUARD_INTERVAL_19_256</constant></entry>
<entry>Guard interval 19/256</entry>
</row><row>
<entry id="GUARD-INTERVAL-PN420"><constant>GUARD_INTERVAL_PN420</constant></entry>
<entry>PN length 420 (1/4)</entry>
</row><row>
<entry id="GUARD-INTERVAL-PN595"><constant>GUARD_INTERVAL_PN595</constant></entry>
<entry>PN length 595 (1/6)</entry>
</row><row>
<entry id="GUARD-INTERVAL-PN945"><constant>GUARD_INTERVAL_PN945</constant></entry>
<entry>PN length 945 (1/9)</entry>
</row>
</tbody>
</tgroup>
</table>
<para>Notes:</para>
<para>1) If <constant>DTV_GUARD_INTERVAL</constant> is set the <constant>GUARD_INTERVAL_AUTO</constant> the hardware will
try to find the correct guard interval (if capable) and will use TMCC to fill
in the missing parameters.</para>
<para>2) Intervals 1/128, 19/128 and 19/256 are used only for DVB-T2 at present</para>
<para>3) DTMB specifies PN420, PN595 and PN945.</para>
</section>
</section>
<section id="DTV-TRANSMISSION-MODE">
<title><constant>DTV_TRANSMISSION_MODE</constant></title>
<para>Specifies the number of carriers used by the standard.
This is used only on OFTM-based standards, e. g.
DVB-T/T2, ISDB-T, DTMB</para>
<section id="fe-transmit-mode-t">
<title>enum fe_transmit_mode: Number of carriers per channel</title>
<table pgwide="1" frame="none" id="fe-transmit-mode">
<title>enum fe_transmit_mode</title>
<tgroup cols="2">
&cs-def;
<thead>
<row>
<entry>ID</entry>
<entry>Description</entry>
</row>
</thead>
<tbody valign="top">
<row>
<entry id="TRANSMISSION-MODE-AUTO"><constant>TRANSMISSION_MODE_AUTO</constant></entry>
<entry>Autodetect transmission mode. The hardware will try to find
the correct FFT-size (if capable) to fill in the missing
parameters.</entry>
</row><row>
<entry id="TRANSMISSION-MODE-1K"><constant>TRANSMISSION_MODE_1K</constant></entry>
<entry>Transmission mode 1K</entry>
</row><row>
<entry id="TRANSMISSION-MODE-2K"><constant>TRANSMISSION_MODE_2K</constant></entry>
<entry>Transmission mode 2K</entry>
</row><row>
<entry id="TRANSMISSION-MODE-8K"><constant>TRANSMISSION_MODE_8K</constant></entry>
<entry>Transmission mode 8K</entry>
</row><row>
<entry id="TRANSMISSION-MODE-4K"><constant>TRANSMISSION_MODE_4K</constant></entry>
<entry>Transmission mode 4K</entry>
</row><row>
<entry id="TRANSMISSION-MODE-16K"><constant>TRANSMISSION_MODE_16K</constant></entry>
<entry>Transmission mode 16K</entry>
</row><row>
<entry id="TRANSMISSION-MODE-32K"><constant>TRANSMISSION_MODE_32K</constant></entry>
<entry>Transmission mode 32K</entry>
</row><row>
<entry id="TRANSMISSION-MODE-C1"><constant>TRANSMISSION_MODE_C1</constant></entry>
<entry>Single Carrier (C=1) transmission mode (DTMB)</entry>
</row><row>
<entry id="TRANSMISSION-MODE-C3780"><constant>TRANSMISSION_MODE_C3780</constant></entry>
<entry>Multi Carrier (C=3780) transmission mode (DTMB)</entry>
</row>
</tbody>
</tgroup>
</table>
<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>
<para>5) DTMB specifies C1 and C3780.</para>
</section>
</section>
<section id="DTV-HIERARCHY">
<title><constant>DTV_HIERARCHY</constant></title>
<para>Frontend hierarchy</para>
<section id="fe-hierarchy-t">
<title>Frontend hierarchy</title>
<table pgwide="1" frame="none" id="fe-hierarchy">
<title>enum fe_hierarchy</title>
<tgroup cols="2">
&cs-def;
<thead>
<row>
<entry>ID</entry>
<entry>Description</entry>
</row>
</thead>
<tbody valign="top">
<row>
<entry id="HIERARCHY-NONE"><constant>HIERARCHY_NONE</constant></entry>
<entry>No hierarchy</entry>
</row><row>
<entry id="HIERARCHY-AUTO"><constant>HIERARCHY_AUTO</constant></entry>
<entry>Autodetect hierarchy (if supported)</entry>
</row><row>
<entry id="HIERARCHY-1"><constant>HIERARCHY_1</constant></entry>
<entry>Hierarchy 1</entry>
</row><row>
<entry id="HIERARCHY-2"><constant>HIERARCHY_2</constant></entry>
<entry>Hierarchy 2</entry>
</row><row>
<entry id="HIERARCHY-4"><constant>HIERARCHY_4</constant></entry>
<entry>Hierarchy 4</entry>
</row>
</tbody>
</tgroup>
</table>
</section>
</section>
<section id="DTV-STREAM-ID">
<title><constant>DTV_STREAM_ID</constant></title>
<para>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, substream filtering is disabled.
</para><para>
For DVB-S2 and DVB-T2, the valid substream id range is from 0 to 255.
</para><para>
For ISDB, the valid substream id range is from 1 to 65535.
</para><para>
To disable it, you should use the special macro NO_STREAM_ID_FILTER.
</para><para>
Note: any value outside the id range also disables filtering.
</para>
</section>
<section id="DTV-DVBT2-PLP-ID-LEGACY">
<title><constant>DTV_DVBT2_PLP_ID_LEGACY</constant></title>
<para>Obsolete, replaced with DTV_STREAM_ID.</para>
</section>
<section id="DTV-ENUM-DELSYS">
<title><constant>DTV_ENUM_DELSYS</constant></title>
<para>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 </para>
</section>
<section id="DTV-INTERLEAVING">
<title><constant>DTV_INTERLEAVING</constant></title>
<para>Time interleaving to be used. Currently, used only on DTMB.</para>
<table pgwide="1" frame="none" id="fe-interleaving">
<title>enum fe_interleaving</title>
<tgroup cols="2">
&cs-def;
<thead>
<row>
<entry>ID</entry>
<entry>Description</entry>
</row>
</thead>
<tbody valign="top">
<row>
<entry id="INTERLEAVING-NONE"><constant>INTERLEAVING_NONE</constant></entry>
<entry>No interleaving.</entry>
</row><row>
<entry id="INTERLEAVING-AUTO"><constant>INTERLEAVING_AUTO</constant></entry>
<entry>Auto-detect interleaving.</entry>
</row><row>
<entry id="INTERLEAVING-240"><constant>INTERLEAVING_240</constant></entry>
<entry>Interleaving of 240 symbols.</entry>
</row><row>
<entry id="INTERLEAVING-720"><constant>INTERLEAVING_720</constant></entry>
<entry>Interleaving of 720 symbols.</entry>
</row>
</tbody>
</tgroup>
</table>
</section>
<section id="DTV-LNA">
<title><constant>DTV_LNA</constant></title>
<para>Low-noise amplifier.</para>
<para>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.</para>
<para>Possible values: 0, 1, LNA_AUTO</para>
<para>0, LNA off</para>
<para>1, LNA on</para>
<para>use the special macro LNA_AUTO to set LNA auto</para>
</section>
</section>
<section id="frontend-stat-properties">
<title>Frontend statistics indicators</title>
<para>The values are returned via <constant>dtv_property.stat</constant>.
If the property is supported, <constant>dtv_property.stat.len</constant> is bigger than zero.</para>
<para>For most delivery systems, <constant>dtv_property.stat.len</constant>
will be 1 if the stats is supported, and the properties will
return a single value for each parameter.</para>
<para>It should be noted, however, that new OFDM delivery systems
like ISDB can use different modulation types for each group of
carriers. On such standards, up to 3 groups of statistics can be
provided, and <constant>dtv_property.stat.len</constant> is updated
to reflect the "global" metrics, plus one metric per each carrier
group (called "layer" on ISDB).</para>
<para>So, in order to be consistent with other delivery systems, the first
value at <link linkend="dtv-stats"><constant>dtv_property.stat.dtv_stats</constant></link>
array refers to the global metric. The other elements of the array
represent each layer, starting from layer A(index 1),
layer B (index 2) and so on.</para>
<para>The number of filled elements are stored at <constant>dtv_property.stat.len</constant>.</para>
<para>Each element of the <constant>dtv_property.stat.dtv_stats</constant> array consists on two elements:</para>
<itemizedlist mark='opencircle'>
<listitem><para><constant>svalue</constant> or <constant>uvalue</constant>, where
<constant>svalue</constant> is for signed values of the measure (dB measures)
and <constant>uvalue</constant> is for unsigned values (counters, relative scale)</para></listitem>
<listitem><para><constant>scale</constant> - Scale for the value. It can be:</para>
<itemizedlist mark='bullet' id="fecap-scale-params">
<listitem id="FE-SCALE-NOT-AVAILABLE"><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - The parameter is supported by the frontend, but it was not possible to collect it (could be a transitory or permanent condition)</para></listitem>
<listitem id="FE-SCALE-DECIBEL"><para><constant>FE_SCALE_DECIBEL</constant> - parameter is a signed value, measured in 1/1000 dB</para></listitem>
<listitem id="FE-SCALE-RELATIVE"><para><constant>FE_SCALE_RELATIVE</constant> - parameter is a unsigned value, where 0 means 0% and 65535 means 100%.</para></listitem>
<listitem id="FE-SCALE-COUNTER"><para><constant>FE_SCALE_COUNTER</constant> - parameter is a unsigned value that counts the occurrence of an event, like bit error, block error, or lapsed time.</para></listitem>
</itemizedlist>
</listitem>
</itemizedlist>
<section id="DTV-STAT-SIGNAL-STRENGTH">
<title><constant>DTV_STAT_SIGNAL_STRENGTH</constant></title>
<para>Indicates the signal strength level at the analog part of the tuner or of the demod.</para>
<para>Possible scales for this metric are:</para>
<itemizedlist mark='bullet'>
<listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</para></listitem>
<listitem><para><constant>FE_SCALE_DECIBEL</constant> - signal strength is in 0.001 dBm units, power measured in miliwatts. This value is generally negative.</para></listitem>
<listitem><para><constant>FE_SCALE_RELATIVE</constant> - The frontend provides a 0% to 100% measurement for power (actually, 0 to 65535).</para></listitem>
</itemizedlist>
</section>
<section id="DTV-STAT-CNR">
<title><constant>DTV_STAT_CNR</constant></title>
<para>Indicates the Signal to Noise ratio for the main carrier.</para>
<para>Possible scales for this metric are:</para>
<itemizedlist mark='bullet'>
<listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</para></listitem>
<listitem><para><constant>FE_SCALE_DECIBEL</constant> - Signal/Noise ratio is in 0.001 dB units.</para></listitem>
<listitem><para><constant>FE_SCALE_RELATIVE</constant> - The frontend provides a 0% to 100% measurement for Signal/Noise (actually, 0 to 65535).</para></listitem>
</itemizedlist>
</section>
<section id="DTV-STAT-PRE-ERROR-BIT-COUNT">
<title><constant>DTV_STAT_PRE_ERROR_BIT_COUNT</constant></title>
<para>Measures the number of bit errors before the forward error correction (FEC) on the inner coding block (before Viterbi, LDPC or other inner code).</para>
<para>This measure is taken during the same interval as <constant>DTV_STAT_PRE_TOTAL_BIT_COUNT</constant>.</para>
<para>In order to get the BER (Bit Error Rate) measurement, it should be divided by
<link linkend="DTV-STAT-PRE-TOTAL-BIT-COUNT"><constant>DTV_STAT_PRE_TOTAL_BIT_COUNT</constant></link>.</para>
<para>This measurement is monotonically increased, as the frontend gets more bit count measurements.
The frontend may reset it when a channel/transponder is tuned.</para>
<para>Possible scales for this metric are:</para>
<itemizedlist mark='bullet'>
<listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</para></listitem>
<listitem><para><constant>FE_SCALE_COUNTER</constant> - Number of error bits counted before the inner coding.</para></listitem>
</itemizedlist>
</section>
<section id="DTV-STAT-PRE-TOTAL-BIT-COUNT">
<title><constant>DTV_STAT_PRE_TOTAL_BIT_COUNT</constant></title>
<para>Measures the amount of bits received before the inner code block, during the same period as
<link linkend="DTV-STAT-PRE-ERROR-BIT-COUNT"><constant>DTV_STAT_PRE_ERROR_BIT_COUNT</constant></link> measurement was taken.</para>
<para>It should be noted that this measurement can be smaller than the total amount of bits on the transport stream,
as the frontend may need to manually restart the measurement, losing some data between each measurement interval.</para>
<para>This measurement is monotonically increased, as the frontend gets more bit count measurements.
The frontend may reset it when a channel/transponder is tuned.</para>
<para>Possible scales for this metric are:</para>
<itemizedlist mark='bullet'>
<listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</para></listitem>
<listitem><para><constant>FE_SCALE_COUNTER</constant> - Number of bits counted while measuring
<link linkend="DTV-STAT-PRE-ERROR-BIT-COUNT"><constant>DTV_STAT_PRE_ERROR_BIT_COUNT</constant></link>.</para></listitem>
</itemizedlist>
</section>
<section id="DTV-STAT-POST-ERROR-BIT-COUNT">
<title><constant>DTV_STAT_POST_ERROR_BIT_COUNT</constant></title>
<para>Measures the number of bit errors after the forward error correction (FEC) done by inner code block (after Viterbi, LDPC or other inner code).</para>
<para>This measure is taken during the same interval as <constant>DTV_STAT_POST_TOTAL_BIT_COUNT</constant>.</para>
<para>In order to get the BER (Bit Error Rate) measurement, it should be divided by
<link linkend="DTV-STAT-POST-TOTAL-BIT-COUNT"><constant>DTV_STAT_POST_TOTAL_BIT_COUNT</constant></link>.</para>
<para>This measurement is monotonically increased, as the frontend gets more bit count measurements.
The frontend may reset it when a channel/transponder is tuned.</para>
<para>Possible scales for this metric are:</para>
<itemizedlist mark='bullet'>
<listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</para></listitem>
<listitem><para><constant>FE_SCALE_COUNTER</constant> - Number of error bits counted after the inner coding.</para></listitem>
</itemizedlist>
</section>
<section id="DTV-STAT-POST-TOTAL-BIT-COUNT">
<title><constant>DTV_STAT_POST_TOTAL_BIT_COUNT</constant></title>
<para>Measures the amount of bits received after the inner coding, during the same period as
<link linkend="DTV-STAT-POST-ERROR-BIT-COUNT"><constant>DTV_STAT_POST_ERROR_BIT_COUNT</constant></link> measurement was taken.</para>
<para>It should be noted that this measurement can be smaller than the total amount of bits on the transport stream,
as the frontend may need to manually restart the measurement, losing some data between each measurement interval.</para>
<para>This measurement is monotonically increased, as the frontend gets more bit count measurements.
The frontend may reset it when a channel/transponder is tuned.</para>
<para>Possible scales for this metric are:</para>
<itemizedlist mark='bullet'>
<listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</para></listitem>
<listitem><para><constant>FE_SCALE_COUNTER</constant> - Number of bits counted while measuring
<link linkend="DTV-STAT-POST-ERROR-BIT-COUNT"><constant>DTV_STAT_POST_ERROR_BIT_COUNT</constant></link>.</para></listitem>
</itemizedlist>
</section>
<section id="DTV-STAT-ERROR-BLOCK-COUNT">
<title><constant>DTV_STAT_ERROR_BLOCK_COUNT</constant></title>
<para>Measures the number of block errors after the outer forward error correction coding (after Reed-Solomon or other outer code).</para>
<para>This measurement is monotonically increased, as the frontend gets more bit count measurements.
The frontend may reset it when a channel/transponder is tuned.</para>
<para>Possible scales for this metric are:</para>
<itemizedlist mark='bullet'>
<listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</para></listitem>
<listitem><para><constant>FE_SCALE_COUNTER</constant> - Number of error blocks counted after the outer coding.</para></listitem>
</itemizedlist>
</section>
<section id="DTV-STAT-TOTAL-BLOCK-COUNT">
<title><constant>DTV-STAT_TOTAL_BLOCK_COUNT</constant></title>
<para>Measures the total number of blocks received during the same period as
<link linkend="DTV-STAT-ERROR-BLOCK-COUNT"><constant>DTV_STAT_ERROR_BLOCK_COUNT</constant></link> measurement was taken.</para>
<para>It can be used to calculate the PER indicator, by dividing
<link linkend="DTV-STAT-ERROR-BLOCK-COUNT"><constant>DTV_STAT_ERROR_BLOCK_COUNT</constant></link>
by <link linkend="DTV-STAT-TOTAL-BLOCK-COUNT"><constant>DTV-STAT-TOTAL-BLOCK-COUNT</constant></link>.</para>
<para>Possible scales for this metric are:</para>
<itemizedlist mark='bullet'>
<listitem><para><constant>FE_SCALE_NOT_AVAILABLE</constant> - it failed to measure it, or the measurement was not complete yet.</para></listitem>
<listitem><para><constant>FE_SCALE_COUNTER</constant> - Number of blocks counted while measuring
<link linkend="DTV-STAT-ERROR-BLOCK-COUNT"><constant>DTV_STAT_ERROR_BLOCK_COUNT</constant></link>.</para></listitem>
</itemizedlist>
</section>
</section>
<section id="frontend-property-terrestrial-systems">
<title>Properties used on terrestrial delivery systems</title>
<section id="dvbt-params">
<title>DVB-T delivery system</title>
<para>The following parameters are valid for DVB-T:</para>
<itemizedlist mark='opencircle'>
<listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem>
<listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem>
<listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem>
<listitem><para><link linkend="DTV-MODULATION"><constant>DTV_MODULATION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-BANDWIDTH-HZ"><constant>DTV_BANDWIDTH_HZ</constant></link></para></listitem>
<listitem><para><link linkend="DTV-INVERSION"><constant>DTV_INVERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-CODE-RATE-HP"><constant>DTV_CODE_RATE_HP</constant></link></para></listitem>
<listitem><para><link linkend="DTV-CODE-RATE-LP"><constant>DTV_CODE_RATE_LP</constant></link></para></listitem>
<listitem><para><link linkend="DTV-GUARD-INTERVAL"><constant>DTV_GUARD_INTERVAL</constant></link></para></listitem>
<listitem><para><link linkend="DTV-TRANSMISSION-MODE"><constant>DTV_TRANSMISSION_MODE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-HIERARCHY"><constant>DTV_HIERARCHY</constant></link></para></listitem>
<listitem><para><link linkend="DTV-LNA"><constant>DTV_LNA</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
</section>
<section id="dvbt2-params">
<title>DVB-T2 delivery system</title>
<para>DVB-T2 support is currently in the early stages
of development, so expect that this section maygrow and become
more detailed with time.</para>
<para>The following parameters are valid for DVB-T2:</para>
<itemizedlist mark='opencircle'>
<listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem>
<listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem>
<listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem>
<listitem><para><link linkend="DTV-MODULATION"><constant>DTV_MODULATION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-BANDWIDTH-HZ"><constant>DTV_BANDWIDTH_HZ</constant></link></para></listitem>
<listitem><para><link linkend="DTV-INVERSION"><constant>DTV_INVERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-CODE-RATE-HP"><constant>DTV_CODE_RATE_HP</constant></link></para></listitem>
<listitem><para><link linkend="DTV-CODE-RATE-LP"><constant>DTV_CODE_RATE_LP</constant></link></para></listitem>
<listitem><para><link linkend="DTV-GUARD-INTERVAL"><constant>DTV_GUARD_INTERVAL</constant></link></para></listitem>
<listitem><para><link linkend="DTV-TRANSMISSION-MODE"><constant>DTV_TRANSMISSION_MODE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-HIERARCHY"><constant>DTV_HIERARCHY</constant></link></para></listitem>
<listitem><para><link linkend="DTV-STREAM-ID"><constant>DTV_STREAM_ID</constant></link></para></listitem>
<listitem><para><link linkend="DTV-LNA"><constant>DTV_LNA</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
</section>
<section id="isdbt">
<title>ISDB-T delivery system</title>
<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 understand the ISDB specific parameters,
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>The following parameters are valid for ISDB-T:</para>
<itemizedlist mark='opencircle'>
<listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem>
<listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem>
<listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem>
<listitem><para><link linkend="DTV-BANDWIDTH-HZ"><constant>DTV_BANDWIDTH_HZ</constant></link></para></listitem>
<listitem><para><link linkend="DTV-INVERSION"><constant>DTV_INVERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-GUARD-INTERVAL"><constant>DTV_GUARD_INTERVAL</constant></link></para></listitem>
<listitem><para><link linkend="DTV-TRANSMISSION-MODE"><constant>DTV_TRANSMISSION_MODE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-LAYER-ENABLED"><constant>DTV_ISDBT_LAYER_ENABLED</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-PARTIAL-RECEPTION"><constant>DTV_ISDBT_PARTIAL_RECEPTION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-SOUND-BROADCASTING"><constant>DTV_ISDBT_SOUND_BROADCASTING</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-SB-SUBCHANNEL-ID"><constant>DTV_ISDBT_SB_SUBCHANNEL_ID</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-SB-SEGMENT-IDX"><constant>DTV_ISDBT_SB_SEGMENT_IDX</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-SB-SEGMENT-COUNT"><constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-LAYER-FEC"><constant>DTV_ISDBT_LAYERA_FEC</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-LAYER-MODULATION"><constant>DTV_ISDBT_LAYERA_MODULATION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-LAYER-SEGMENT-COUNT"><constant>DTV_ISDBT_LAYERA_SEGMENT_COUNT</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-LAYER-TIME-INTERLEAVING"><constant>DTV_ISDBT_LAYERA_TIME_INTERLEAVING</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-LAYER-FEC"><constant>DTV_ISDBT_LAYERB_FEC</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-LAYER-MODULATION"><constant>DTV_ISDBT_LAYERB_MODULATION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-LAYER-SEGMENT-COUNT"><constant>DTV_ISDBT_LAYERB_SEGMENT_COUNT</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-LAYER-TIME-INTERLEAVING"><constant>DTV_ISDBT_LAYERB_TIME_INTERLEAVING</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-LAYER-FEC"><constant>DTV_ISDBT_LAYERC_FEC</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-LAYER-MODULATION"><constant>DTV_ISDBT_LAYERC_MODULATION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-LAYER-SEGMENT-COUNT"><constant>DTV_ISDBT_LAYERC_SEGMENT_COUNT</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ISDBT-LAYER-TIME-INTERLEAVING"><constant>DTV_ISDBT_LAYERC_TIME_INTERLEAVING</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
</section>
<section id="atsc-params">
<title>ATSC delivery system</title>
<para>The following parameters are valid for ATSC:</para>
<itemizedlist mark='opencircle'>
<listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem>
<listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem>
<listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem>
<listitem><para><link linkend="DTV-MODULATION"><constant>DTV_MODULATION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-BANDWIDTH-HZ"><constant>DTV_BANDWIDTH_HZ</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
</section>
<section id="atscmh-params">
<title>ATSC-MH delivery system</title>
<para>The following parameters are valid for ATSC-MH:</para>
<itemizedlist mark='opencircle'>
<listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem>
<listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem>
<listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem>
<listitem><para><link linkend="DTV-BANDWIDTH-HZ"><constant>DTV_BANDWIDTH_HZ</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ATSCMH-FIC-VER"><constant>DTV_ATSCMH_FIC_VER</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ATSCMH-PARADE-ID"><constant>DTV_ATSCMH_PARADE_ID</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ATSCMH-NOG"><constant>DTV_ATSCMH_NOG</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ATSCMH-TNOG"><constant>DTV_ATSCMH_TNOG</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ATSCMH-SGN"><constant>DTV_ATSCMH_SGN</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ATSCMH-PRC"><constant>DTV_ATSCMH_PRC</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ATSCMH-RS-FRAME-MODE"><constant>DTV_ATSCMH_RS_FRAME_MODE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ATSCMH-RS-FRAME-ENSEMBLE"><constant>DTV_ATSCMH_RS_FRAME_ENSEMBLE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ATSCMH-RS-CODE-MODE-PRI"><constant>DTV_ATSCMH_RS_CODE_MODE_PRI</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ATSCMH-RS-CODE-MODE-SEC"><constant>DTV_ATSCMH_RS_CODE_MODE_SEC</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ATSCMH-SCCC-BLOCK-MODE"><constant>DTV_ATSCMH_SCCC_BLOCK_MODE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ATSCMH-SCCC-CODE-MODE-A"><constant>DTV_ATSCMH_SCCC_CODE_MODE_A</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ATSCMH-SCCC-CODE-MODE-B"><constant>DTV_ATSCMH_SCCC_CODE_MODE_B</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ATSCMH-SCCC-CODE-MODE-C"><constant>DTV_ATSCMH_SCCC_CODE_MODE_C</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ATSCMH-SCCC-CODE-MODE-D"><constant>DTV_ATSCMH_SCCC_CODE_MODE_D</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
</section>
<section id="dtmb-params">
<title>DTMB delivery system</title>
<para>The following parameters are valid for DTMB:</para>
<itemizedlist mark='opencircle'>
<listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem>
<listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem>
<listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem>
<listitem><para><link linkend="DTV-MODULATION"><constant>DTV_MODULATION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-BANDWIDTH-HZ"><constant>DTV_BANDWIDTH_HZ</constant></link></para></listitem>
<listitem><para><link linkend="DTV-INVERSION"><constant>DTV_INVERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-INNER-FEC"><constant>DTV_INNER_FEC</constant></link></para></listitem>
<listitem><para><link linkend="DTV-GUARD-INTERVAL"><constant>DTV_GUARD_INTERVAL</constant></link></para></listitem>
<listitem><para><link linkend="DTV-TRANSMISSION-MODE"><constant>DTV_TRANSMISSION_MODE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-INTERLEAVING"><constant>DTV_INTERLEAVING</constant></link></para></listitem>
<listitem><para><link linkend="DTV-LNA"><constant>DTV_LNA</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
</section>
</section>
<section id="frontend-property-cable-systems">
<title>Properties used on cable delivery systems</title>
<section id="dvbc-params">
<title>DVB-C delivery system</title>
<para>The DVB-C Annex-A is the widely used cable standard. Transmission uses QAM modulation.</para>
<para>The DVB-C Annex-C is optimized for 6MHz, and is used in Japan. It supports a subset of the Annex A modulation types, and a roll-off of 0.13, instead of 0.15</para>
<para>The following parameters are valid for DVB-C Annex A/C:</para>
<itemizedlist mark='opencircle'>
<listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem>
<listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem>
<listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem>
<listitem><para><link linkend="DTV-MODULATION"><constant>DTV_MODULATION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-INVERSION"><constant>DTV_INVERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-SYMBOL-RATE"><constant>DTV_SYMBOL_RATE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-INNER-FEC"><constant>DTV_INNER_FEC</constant></link></para></listitem>
<listitem><para><link linkend="DTV-LNA"><constant>DTV_LNA</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
</section>
<section id="dvbc-annex-b-params">
<title>DVB-C Annex B delivery system</title>
<para>The DVB-C Annex-B is only used on a few Countries like the United States.</para>
<para>The following parameters are valid for DVB-C Annex B:</para>
<itemizedlist mark='opencircle'>
<listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem>
<listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem>
<listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem>
<listitem><para><link linkend="DTV-MODULATION"><constant>DTV_MODULATION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-INVERSION"><constant>DTV_INVERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-LNA"><constant>DTV_LNA</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
</section>
</section>
<section id="frontend-property-satellite-systems">
<title>Properties used on satellite delivery systems</title>
<section id="dvbs-params">
<title>DVB-S delivery system</title>
<para>The following parameters are valid for DVB-S:</para>
<itemizedlist mark='opencircle'>
<listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem>
<listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem>
<listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem>
<listitem><para><link linkend="DTV-INVERSION"><constant>DTV_INVERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-SYMBOL-RATE"><constant>DTV_SYMBOL_RATE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-INNER-FEC"><constant>DTV_INNER_FEC</constant></link></para></listitem>
<listitem><para><link linkend="DTV-VOLTAGE"><constant>DTV_VOLTAGE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-TONE"><constant>DTV_TONE</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
<para>Future implementations might add those two missing parameters:</para>
<itemizedlist mark='opencircle'>
<listitem><para><link linkend="DTV-DISEQC-MASTER"><constant>DTV_DISEQC_MASTER</constant></link></para></listitem>
<listitem><para><link linkend="DTV-DISEQC-SLAVE-REPLY"><constant>DTV_DISEQC_SLAVE_REPLY</constant></link></para></listitem>
</itemizedlist>
</section>
<section id="dvbs2-params">
<title>DVB-S2 delivery system</title>
<para>In addition to all parameters valid for DVB-S, DVB-S2 supports the following parameters:</para>
<itemizedlist mark='opencircle'>
<listitem><para><link linkend="DTV-MODULATION"><constant>DTV_MODULATION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-PILOT"><constant>DTV_PILOT</constant></link></para></listitem>
<listitem><para><link linkend="DTV-ROLLOFF"><constant>DTV_ROLLOFF</constant></link></para></listitem>
<listitem><para><link linkend="DTV-STREAM-ID"><constant>DTV_STREAM_ID</constant></link></para></listitem>
</itemizedlist>
<para>In addition, the <link linkend="frontend-stat-properties">DTV QoS statistics</link> are also valid.</para>
</section>
<section id="turbo-params">
<title>Turbo code delivery system</title>
<para>In addition to all parameters valid for DVB-S, turbo code supports the following parameters:</para>
<itemizedlist mark='opencircle'>
<listitem><para><link linkend="DTV-MODULATION"><constant>DTV_MODULATION</constant></link></para></listitem>
</itemizedlist>
</section>
<section id="isdbs-params">
<title>ISDB-S delivery system</title>
<para>The following parameters are valid for ISDB-S:</para>
<itemizedlist mark='opencircle'>
<listitem><para><link linkend="DTV-API-VERSION"><constant>DTV_API_VERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-DELIVERY-SYSTEM"><constant>DTV_DELIVERY_SYSTEM</constant></link></para></listitem>
<listitem><para><link linkend="DTV-TUNE"><constant>DTV_TUNE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-CLEAR"><constant>DTV_CLEAR</constant></link></para></listitem>
<listitem><para><link linkend="DTV-FREQUENCY"><constant>DTV_FREQUENCY</constant></link></para></listitem>
<listitem><para><link linkend="DTV-INVERSION"><constant>DTV_INVERSION</constant></link></para></listitem>
<listitem><para><link linkend="DTV-SYMBOL-RATE"><constant>DTV_SYMBOL_RATE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-INNER-FEC"><constant>DTV_INNER_FEC</constant></link></para></listitem>
<listitem><para><link linkend="DTV-VOLTAGE"><constant>DTV_VOLTAGE</constant></link></para></listitem>
<listitem><para><link linkend="DTV-STREAM-ID"><constant>DTV_STREAM_ID</constant></link></para></listitem>
</itemizedlist>
</section>
</section>
</section>