path: root/Documentation/DocBook/media/dvb/dvbproperty.xml

<section id="FE_GET_SET_PROPERTY">
<title><constant>FE_GET_PROPERTY/FE_SET_PROPERTY</constant></title>
<para>This section describes the DVB version 5 extention of the DVB-API, also
called "S2API", as this API were added to provide support for DVB-S2. It was
designed to be able to replace the old frontend API. Yet, the DISEQC and
the capability ioctls weren't implemented yet via the new way.</para>
<para>The typical usage for the <constant>FE_GET_PROPERTY/FE_SET_PROPERTY</constant>
API is to replace the ioctl's were the <link linkend="dvb-frontend-parameters">
struct <constant>dvb_frontend_parameters</constant></link> were used.</para>
<section id="dtv-property">
<title>DTV property type</title>
<programlisting>
/* Reserved fields should be set to 0 */
struct dtv_property {
	__u32 cmd;
	union {
		__u32 data;
		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>DTV properties type</title>
<programlisting>
struct dtv_properties {
	__u32 num;
	struct dtv_property *props;
};
</programlisting>
</section>

<section id="FE_GET_PROPERTY">
<title>FE_GET_PROPERTY</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
 align="char">
<para>This ioctl call returns one or more frontend properties. This call only
 requires read-only access to the device.</para>
</entry>
 </row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
 align="char">
<para>int ioctl(int fd, int request = <link linkend="FE_GET_PROPERTY">FE_GET_PROPERTY</link>,
 dtv_properties &#x22C6;props);</para>
</entry>
 </row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry align="char">
<para>int fd</para>
</entry><entry
 align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
 </row><row><entry
 align="char">
<para>int num</para>
</entry><entry
 align="char">
<para>Equals <link linkend="FE_GET_PROPERTY">FE_GET_PROPERTY</link> for this command.</para>
</entry>
 </row><row><entry
 align="char">
<para>struct dtv_property *props</para>
</entry><entry
 align="char">
<para>Points to the location where the front-end property commands are stored.</para>
</entry>
 </row></tbody></tgroup></informaltable>
&return-value-dvb;
<informaltable><tgroup cols="2"><tbody><row>
  <entry align="char"><para>EOPNOTSUPP</para></entry>
  <entry align="char"><para>Property type not supported.</para></entry>
 </row></tbody></tgroup></informaltable>
</section>

<section id="FE_SET_PROPERTY">
<title>FE_SET_PROPERTY</title>
<para>DESCRIPTION
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
 align="char">
<para>This ioctl call sets one or more frontend properties. This call only
 requires read-only access to the device.</para>
</entry>
 </row></tbody></tgroup></informaltable>
<para>SYNOPSIS
</para>
<informaltable><tgroup cols="1"><tbody><row><entry
 align="char">
<para>int ioctl(int fd, int request = <link linkend="FE_SET_PROPERTY">FE_SET_PROPERTY</link>,
 dtv_properties &#x22C6;props);</para>
</entry>
 </row></tbody></tgroup></informaltable>
<para>PARAMETERS
</para>
<informaltable><tgroup cols="2"><tbody><row><entry align="char">
<para>int fd</para>
</entry><entry
 align="char">
<para>File descriptor returned by a previous call to open().</para>
</entry>
 </row><row><entry
 align="char">
<para>int num</para>
</entry><entry
 align="char">
<para>Equals <link linkend="FE_SET_PROPERTY">FE_SET_PROPERTY</link> for this command.</para>
</entry>
 </row><row><entry
 align="char">
<para>struct dtv_property *props</para>
</entry><entry
 align="char">
<para>Points to the location where the front-end property commands are stored.</para>
</entry>
 </row></tbody></tgroup></informaltable>
&return-value-dvb;
<informaltable><tgroup cols="2"><tbody><row>
  <entry align="char"><para>EOPNOTSUPP</para></entry>
  <entry align="char"><para>Property type not supported.</para></entry>
 </row></tbody></tgroup></informaltable>
</section>

<section>
	<title>Property types</title>
<para>
On <link linkend="FE_GET_PROPERTY">FE_GET_PROPERTY</link>/<link linkend="FE_SET_PROPERTY">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, in HZ.</para>

		<para>Notes:</para>
		<para>1)For ISDB-T, the channels are usually transmitted with an offset of 143kHz.
			E.g. a valid frequncy could be 474143 kHz. The stepping is bound to the bandwidth of
			the channel which is 6MHz.</para>

		<para>2)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 cable and satellite types. The modulation can be one of the types bellow:</para>
<programlisting>
 typedef enum fe_modulation {
	QPSK,
	QAM_16,
	QAM_32,
	QAM_64,
	QAM_128,
	QAM_256,
	QAM_AUTO,
	VSB_8,
	VSB_16,
	PSK_8,
	APSK_16,
	APSK_32,
	DQPSK,
 } fe_modulation_t;
</programlisting>
	</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>The Inversion field can take one of these values:
	</para>
	<programlisting>
	typedef enum fe_spectral_inversion {
		INVERSION_OFF,
		INVERSION_ON,
		INVERSION_AUTO
	} fe_spectral_inversion_t;
	</programlisting>
	<para>It 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.
	</para>
	</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>
	<programlisting>
typedef enum fe_code_rate {
	FEC_NONE = 0,
	FEC_1_2,
	FEC_2_3,
	FEC_3_4,
	FEC_4_5,
	FEC_5_6,
	FEC_6_7,
	FEC_7_8,
	FEC_8_9,
	FEC_AUTO,
	FEC_3_5,
	FEC_9_10,
} fe_code_rate_t;
	</programlisting>
	<para>which correspond to error correction rates of 1/2, 2/3, etc.,
	no error correction or auto detection.</para>
	</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>
	<programlisting>
		typedef enum fe_sec_voltage {
		SEC_VOLTAGE_13,
		SEC_VOLTAGE_18
		} fe_sec_voltage_t;
	</programlisting>
	</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>
		<programlisting>
typedef enum fe_pilot {
	PILOT_ON,
	PILOT_OFF,
	PILOT_AUTO,
} fe_pilot_t;
		</programlisting>
		</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>
		<programlisting>
typedef enum fe_rolloff {
	ROLLOFF_35, /* Implied value in DVB-S, default for DVB-S2 */
	ROLLOFF_20,
	ROLLOFF_25,
	ROLLOFF_AUTO,
	ROLLOFF_15, /* DVB-C Annex A */
	ROLLOFF_13, /* DVB-C Annex C */
} fe_rolloff_t;
		</programlisting>
		</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>
<programlisting>
typedef enum fe_delivery_system {
	SYS_UNDEFINED,
	SYS_DVBC_ANNEX_AC,
	SYS_DVBC_ANNEX_B,
	SYS_DVBT,
	SYS_DSS,
	SYS_DVBS,
	SYS_DVBS2,
	SYS_DVBH,
	SYS_ISDBT,
	SYS_ISDBS,
	SYS_ISDBC,
	SYS_ATSC,
	SYS_ATSCMH,
	SYS_DMBTH,
	SYS_CMMB,
	SYS_DAB,
	SYS_DVBT2,
	SYS_TURBO,
} fe_delivery_system_t;
</programlisting>
		</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>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>
	<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:
	</para>
	<programlisting>
typedef enum fe_code_rate {
	FEC_NONE = 0,
	FEC_1_2,
	FEC_2_3,
	FEC_3_4,
	FEC_4_5,
	FEC_5_6,
	FEC_6_7,
	FEC_7_8,
	FEC_8_9,
	FEC_AUTO,
	FEC_3_5,
	FEC_9_10,
} fe_code_rate_t;
	</programlisting>
	</section>
	<section id="DTV-CODE-RATE-LP">
	<title><constant>DTV_CODE_RATE_LP</constant></title>
	<para>Used on terrestrial transmissions. The acceptable values are:
	</para>
	<programlisting>
typedef enum fe_code_rate {
	FEC_NONE = 0,
	FEC_1_2,
	FEC_2_3,
	FEC_3_4,
	FEC_4_5,
	FEC_5_6,
	FEC_6_7,
	FEC_7_8,
	FEC_8_9,
	FEC_AUTO,
	FEC_3_5,
	FEC_9_10,
} fe_code_rate_t;
	</programlisting>
	</section>
	<section id="DTV-GUARD-INTERVAL">
		<title><constant>DTV_GUARD_INTERVAL</constant></title>

		<para>Possible values are:</para>
<programlisting>
typedef enum fe_guard_interval {
	GUARD_INTERVAL_1_32,
	GUARD_INTERVAL_1_16,
	GUARD_INTERVAL_1_8,
	GUARD_INTERVAL_1_4,
	GUARD_INTERVAL_AUTO,
	GUARD_INTERVAL_1_128,
	GUARD_INTERVAL_19_128,
	GUARD_INTERVAL_19_256,
} fe_guard_interval_t;
</programlisting>

		<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>
	</section>
	<section id="DTV-TRANSMISSION-MODE">
		<title><constant>DTV_TRANSMISSION_MODE</constant></title>

		<para>Specifies the number of carriers used by the standard</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>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-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="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>
	<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>
			</itemizedlist>
		</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-DVBT2-PLP-ID"><constant>DTV_DVBT2_PLP_ID</constant></link></para></listitem>
		</itemizedlist>
		</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-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-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>
		</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>
		</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/C is the widely used cable standard. Transmission uses QAM modulation.</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-ROLLOFF"><constant>DTV_ROLLOFF</constant></link></para></listitem>
			<listitem><para><link linkend="DTV-INNER-FEC"><constant>DTV_INNER_FEC</constant></link></para></listitem>
		</itemizedlist>
		<para>The Rolloff of 0.15 (ROLLOFF_15) is assumed, as ITU-T J.83 Annex A is more common. For Annex C, rolloff should be 0.13 (ROLLOFF_13). All other values are invalid.</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>
		</itemizedlist>
	</section>
	</section>
	<section id="frontend-property-satellital-systems">
	<title>Properties used on satellital 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>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>
		</itemizedlist>
	</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-ISDBS-TS-ID"><constant>DTV_ISDBS_TS_ID</constant></link></para></listitem>
		</itemizedlist>
	</section>
	</section>
</section>