About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog

Documentation / DocBook / dvb / dvbproperty.xml




Custom Search

Based on kernel version 3.0.4. Page generated on 2011-10-03 22:07 EST.

1	<section id="FE_GET_SET_PROPERTY">
2	<title>FE_GET_PROPERTY/FE_SET_PROPERTY</title>
3	
4	<programlisting>
5	/* Reserved fields should be set to 0 */
6	struct dtv_property {
7		__u32 cmd;
8		union {
9			__u32 data;
10			struct {
11				__u8 data[32];
12				__u32 len;
13				__u32 reserved1[3];
14				void *reserved2;
15			} buffer;
16		} u;
17		int result;
18	} __attribute__ ((packed));
19	
20	/* num of properties cannot exceed DTV_IOCTL_MAX_MSGS per ioctl */
21	#define DTV_IOCTL_MAX_MSGS 64
22	
23	struct dtv_properties {
24		__u32 num;
25		struct dtv_property *props;
26	};
27	</programlisting>
28	
29	<section id="FE_GET_PROPERTY">
30	<title>FE_GET_PROPERTY</title>
31	<para>DESCRIPTION
32	</para>
33	<informaltable><tgroup cols="1"><tbody><row><entry
34	 align="char">
35	<para>This ioctl call returns one or more frontend properties. This call only
36	 requires read-only access to the device.</para>
37	</entry>
38	 </row></tbody></tgroup></informaltable>
39	<para>SYNOPSIS
40	</para>
41	<informaltable><tgroup cols="1"><tbody><row><entry
42	 align="char">
43	<para>int ioctl(int fd, int request = <link linkend="FE_GET_PROPERTY">FE_GET_PROPERTY</link>,
44	 dtv_properties &#x22C6;props);</para>
45	</entry>
46	 </row></tbody></tgroup></informaltable>
47	<para>PARAMETERS
48	</para>
49	<informaltable><tgroup cols="2"><tbody><row><entry align="char">
50	<para>int fd</para>
51	</entry><entry
52	 align="char">
53	<para>File descriptor returned by a previous call to open().</para>
54	</entry>
55	 </row><row><entry
56	 align="char">
57	<para>int num</para>
58	</entry><entry
59	 align="char">
60	<para>Equals <link linkend="FE_GET_PROPERTY">FE_GET_PROPERTY</link> for this command.</para>
61	</entry>
62	 </row><row><entry
63	 align="char">
64	<para>struct dtv_property *props</para>
65	</entry><entry
66	 align="char">
67	<para>Points to the location where the front-end property commands are stored.</para>
68	</entry>
69	 </row></tbody></tgroup></informaltable>
70	<para>ERRORS</para>
71	<informaltable><tgroup cols="2"><tbody><row>
72	  <entry align="char"><para>EINVAL</para></entry>
73	  <entry align="char"><para>Invalid parameter(s) received or number of parameters out of the range.</para></entry>
74	 </row><row>
75	  <entry align="char"><para>ENOMEM</para></entry>
76	  <entry align="char"><para>Out of memory.</para></entry>
77	 </row><row>
78	  <entry align="char"><para>EFAULT</para></entry>
79	  <entry align="char"><para>Failure while copying data from/to userspace.</para></entry>
80	 </row><row>
81	  <entry align="char"><para>EOPNOTSUPP</para></entry>
82	  <entry align="char"><para>Property type not supported.</para></entry>
83	 </row></tbody></tgroup></informaltable>
84	</section>
85	
86	<section id="FE_SET_PROPERTY">
87	<title>FE_SET_PROPERTY</title>
88	<para>DESCRIPTION
89	</para>
90	<informaltable><tgroup cols="1"><tbody><row><entry
91	 align="char">
92	<para>This ioctl call sets one or more frontend properties. This call only
93	 requires read-only access to the device.</para>
94	</entry>
95	 </row></tbody></tgroup></informaltable>
96	<para>SYNOPSIS
97	</para>
98	<informaltable><tgroup cols="1"><tbody><row><entry
99	 align="char">
100	<para>int ioctl(int fd, int request = <link linkend="FE_SET_PROPERTY">FE_SET_PROPERTY</link>,
101	 dtv_properties &#x22C6;props);</para>
102	</entry>
103	 </row></tbody></tgroup></informaltable>
104	<para>PARAMETERS
105	</para>
106	<informaltable><tgroup cols="2"><tbody><row><entry align="char">
107	<para>int fd</para>
108	</entry><entry
109	 align="char">
110	<para>File descriptor returned by a previous call to open().</para>
111	</entry>
112	 </row><row><entry
113	 align="char">
114	<para>int num</para>
115	</entry><entry
116	 align="char">
117	<para>Equals <link linkend="FE_SET_PROPERTY">FE_SET_PROPERTY</link> for this command.</para>
118	</entry>
119	 </row><row><entry
120	 align="char">
121	<para>struct dtv_property *props</para>
122	</entry><entry
123	 align="char">
124	<para>Points to the location where the front-end property commands are stored.</para>
125	</entry>
126	 </row></tbody></tgroup></informaltable>
127	<para>ERRORS
128	</para>
129	<informaltable><tgroup cols="2"><tbody><row>
130	  <entry align="char"><para>EINVAL</para></entry>
131	  <entry align="char"><para>Invalid parameter(s) received or number of parameters out of the range.</para></entry>
132	 </row><row>
133	  <entry align="char"><para>ENOMEM</para></entry>
134	  <entry align="char"><para>Out of memory.</para></entry>
135	 </row><row>
136	  <entry align="char"><para>EFAULT</para></entry>
137	  <entry align="char"><para>Failure while copying data from/to userspace.</para></entry>
138	 </row><row>
139	  <entry align="char"><para>EOPNOTSUPP</para></entry>
140	  <entry align="char"><para>Property type not supported.</para></entry>
141	 </row></tbody></tgroup></informaltable>
142	</section>
143	
144	<section>
145		<title>Property types</title>
146	<para>
147	On <link linkend="FE_GET_PROPERTY">FE_GET_PROPERTY</link>/<link linkend="FE_SET_PROPERTY">FE_SET_PROPERTY</link>,
148	the actual action is determined by the dtv_property cmd/data pairs. With one single ioctl, is possible to
149	get/set up to 64 properties. The actual meaning of each property is described on the next sections.
150	</para>
151	
152	<para>The available frontend property types are:</para>
153	<programlisting>
154	#define DTV_UNDEFINED		0
155	#define DTV_TUNE		1
156	#define DTV_CLEAR		2
157	#define DTV_FREQUENCY		3
158	#define DTV_MODULATION		4
159	#define DTV_BANDWIDTH_HZ	5
160	#define DTV_INVERSION		6
161	#define DTV_DISEQC_MASTER	7
162	#define DTV_SYMBOL_RATE		8
163	#define DTV_INNER_FEC		9
164	#define DTV_VOLTAGE		10
165	#define DTV_TONE		11
166	#define DTV_PILOT		12
167	#define DTV_ROLLOFF		13
168	#define DTV_DISEQC_SLAVE_REPLY	14
169	#define DTV_FE_CAPABILITY_COUNT	15
170	#define DTV_FE_CAPABILITY	16
171	#define DTV_DELIVERY_SYSTEM	17
172	#define DTV_ISDBT_PARTIAL_RECEPTION	18
173	#define DTV_ISDBT_SOUND_BROADCASTING	19
174	#define DTV_ISDBT_SB_SUBCHANNEL_ID	20
175	#define DTV_ISDBT_SB_SEGMENT_IDX	21
176	#define DTV_ISDBT_SB_SEGMENT_COUNT	22
177	#define DTV_ISDBT_LAYERA_FEC			23
178	#define DTV_ISDBT_LAYERA_MODULATION		24
179	#define DTV_ISDBT_LAYERA_SEGMENT_COUNT		25
180	#define DTV_ISDBT_LAYERA_TIME_INTERLEAVING	26
181	#define DTV_ISDBT_LAYERB_FEC			27
182	#define DTV_ISDBT_LAYERB_MODULATION		28
183	#define DTV_ISDBT_LAYERB_SEGMENT_COUNT		29
184	#define DTV_ISDBT_LAYERB_TIME_INTERLEAVING	30
185	#define DTV_ISDBT_LAYERC_FEC			31
186	#define DTV_ISDBT_LAYERC_MODULATION		32
187	#define DTV_ISDBT_LAYERC_SEGMENT_COUNT		33
188	#define DTV_ISDBT_LAYERC_TIME_INTERLEAVING	34
189	#define DTV_API_VERSION		35
190	#define DTV_CODE_RATE_HP	36
191	#define DTV_CODE_RATE_LP	37
192	#define DTV_GUARD_INTERVAL	38
193	#define DTV_TRANSMISSION_MODE	39
194	#define DTV_HIERARCHY		40
195	#define DTV_ISDBT_LAYER_ENABLED	41
196	#define DTV_ISDBS_TS_ID		42
197	</programlisting>
198	</section>
199	
200	<section id="fe_property_common">
201		<title>Parameters that are common to all Digital TV standards</title>
202		<section id="DTV_FREQUENCY">
203			<title><constant>DTV_FREQUENCY</constant></title>
204	
205			<para>Central frequency of the channel, in HZ.</para>
206	
207			<para>Notes:</para>
208			<para>1)For ISDB-T, the channels are usually transmitted with an offset of 143kHz.
209				E.g. a valid frequncy could be 474143 kHz. The stepping is bound to the bandwidth of
210				the channel which is 6MHz.</para>
211	
212			<para>2)As in ISDB-Tsb the channel consists of only one or three segments the
213				frequency step is 429kHz, 3*429 respectively. As for ISDB-T the
214				central frequency of the channel is expected.</para>
215		</section>
216	
217		<section id="DTV_BANDWIDTH_HZ">
218			<title><constant>DTV_BANDWIDTH_HZ</constant></title>
219	
220			<para>Bandwidth for the channel, in HZ.</para>
221	
222			<para>Possible values:
223				<constant>1712000</constant>,
224				<constant>5000000</constant>,
225				<constant>6000000</constant>,
226				<constant>7000000</constant>,
227				<constant>8000000</constant>,
228				<constant>10000000</constant>.
229			</para>
230	
231			<para>Notes:</para>
232	
233			<para>1) For ISDB-T it should be always 6000000Hz (6MHz)</para>
234			<para>2) For ISDB-Tsb it can vary depending on the number of connected segments</para>
235			<para>3) Bandwidth doesn't apply for DVB-C transmissions, as the bandwidth
236				 for DVB-C depends on the symbol rate</para>
237			<para>4) Bandwidth in ISDB-T is fixed (6MHz) or can be easily derived from
238				other parameters (DTV_ISDBT_SB_SEGMENT_IDX,
239				DTV_ISDBT_SB_SEGMENT_COUNT).</para>
240			<para>5) DVB-T supports 6, 7 and 8MHz.</para>
241			<para>6) In addition, DVB-T2 supports 1.172, 5 and 10MHz.</para>
242		</section>
243	
244		<section id="DTV_DELIVERY_SYSTEM">
245			<title><constant>DTV_DELIVERY_SYSTEM</constant></title>
246	
247			<para>Specifies the type of Delivery system</para>
248	
249			<para>Possible values: </para>
250	<programlisting>
251	typedef enum fe_delivery_system {
252		SYS_UNDEFINED,
253		SYS_DVBC_ANNEX_AC,
254		SYS_DVBC_ANNEX_B,
255		SYS_DVBT,
256		SYS_DSS,
257		SYS_DVBS,
258		SYS_DVBS2,
259		SYS_DVBH,
260		SYS_ISDBT,
261		SYS_ISDBS,
262		SYS_ISDBC,
263		SYS_ATSC,
264		SYS_ATSCMH,
265		SYS_DMBTH,
266		SYS_CMMB,
267		SYS_DAB,
268		SYS_DVBT2,
269	} fe_delivery_system_t;
270	</programlisting>
271	
272		</section>
273	
274		<section id="DTV_TRANSMISSION_MODE">
275			<title><constant>DTV_TRANSMISSION_MODE</constant></title>
276	
277			<para>Specifies the number of carriers used by the standard</para>
278	
279			<para>Possible values are:</para>
280	<programlisting>
281	typedef enum fe_transmit_mode {
282		TRANSMISSION_MODE_2K,
283		TRANSMISSION_MODE_8K,
284		TRANSMISSION_MODE_AUTO,
285		TRANSMISSION_MODE_4K,
286		TRANSMISSION_MODE_1K,
287		TRANSMISSION_MODE_16K,
288		TRANSMISSION_MODE_32K,
289	} fe_transmit_mode_t;
290	</programlisting>
291	
292			<para>Notes:</para>
293			<para>1) ISDB-T supports three carrier/symbol-size: 8K, 4K, 2K. It is called
294				'mode' in the standard: Mode 1 is 2K, mode 2 is 4K, mode 3 is 8K</para>
295	
296			<para>2) If <constant>DTV_TRANSMISSION_MODE</constant> is set the <constant>TRANSMISSION_MODE_AUTO</constant> the
297				hardware will try to find the correct FFT-size (if capable) and will
298				use TMCC to fill in the missing parameters.</para>
299			<para>3) DVB-T specifies 2K and 8K as valid sizes.</para>
300			<para>4) DVB-T2 specifies 1K, 2K, 4K, 8K, 16K and 32K.</para>
301		</section>
302	
303		<section id="DTV_GUARD_INTERVAL">
304			<title><constant>DTV_GUARD_INTERVAL</constant></title>
305	
306			<para>Possible values are:</para>
307	<programlisting>
308	typedef enum fe_guard_interval {
309		GUARD_INTERVAL_1_32,
310		GUARD_INTERVAL_1_16,
311		GUARD_INTERVAL_1_8,
312		GUARD_INTERVAL_1_4,
313		GUARD_INTERVAL_AUTO,
314		GUARD_INTERVAL_1_128,
315		GUARD_INTERVAL_19_128,
316		GUARD_INTERVAL_19_256,
317	} fe_guard_interval_t;
318	</programlisting>
319	
320			<para>Notes:</para>
321			<para>1) If <constant>DTV_GUARD_INTERVAL</constant> is set the <constant>GUARD_INTERVAL_AUTO</constant> the hardware will
322				try to find the correct guard interval (if capable) and will use TMCC to fill
323				in the missing parameters.</para>
324			<para>2) Intervals 1/128, 19/128 and 19/256 are used only for DVB-T2 at present</para>
325		</section>
326	</section>
327	
328	<section id="isdbt">
329		<title>ISDB-T frontend</title>
330		<para>This section describes shortly what are the possible parameters in the Linux
331			DVB-API called "S2API" and now DVB API 5 in order to tune an ISDB-T/ISDB-Tsb
332			demodulator:</para>
333	
334		<para>This ISDB-T/ISDB-Tsb API extension should reflect all information
335			needed to tune any ISDB-T/ISDB-Tsb hardware. Of course it is possible
336			that some very sophisticated devices won't need certain parameters to
337			tune.</para>
338	
339		<para>The information given here should help application writers to know how
340			to handle ISDB-T and ISDB-Tsb hardware using the Linux DVB-API.</para>
341	
342		<para>The details given here about ISDB-T and ISDB-Tsb are just enough to
343			basically show the dependencies between the needed parameter values,
344			but surely some information is left out. For more detailed information
345			see the following documents:</para>
346	
347		<para>ARIB STD-B31 - "Transmission System for Digital Terrestrial
348			Television Broadcasting" and</para>
349		<para>ARIB TR-B14 - "Operational Guidelines for Digital Terrestrial
350			Television Broadcasting".</para>
351	
352		<para>In order to read this document one has to have some knowledge the
353			channel structure in ISDB-T and ISDB-Tsb. I.e. it has to be known to
354			the reader that an ISDB-T channel consists of 13 segments, that it can
355			have up to 3 layer sharing those segments, and things like that.</para>
356	
357		<para>Parameters used by ISDB-T and ISDB-Tsb.</para>
358	
359		<section id="isdbt-new-parms">
360			<title>ISDB-T only parameters</title>
361	
362			<section id="isdbt-part-rec">
363				<title><constant>DTV_ISDBT_PARTIAL_RECEPTION</constant></title>
364	
365				<para><constant>If DTV_ISDBT_SOUND_BROADCASTING</constant> is '0' this bit-field represents whether
366					the channel is in partial reception mode or not.</para>
367	
368				<para>If '1' <constant>DTV_ISDBT_LAYERA_*</constant> values are assigned to the center segment and
369					<constant>DTV_ISDBT_LAYERA_SEGMENT_COUNT</constant> has to be '1'.</para>
370	
371				<para>If in addition <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'
372					<constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> represents whether this ISDB-Tsb channel
373					is consisting of one segment and layer or three segments and two layers.</para>
374	
375				<para>Possible values: 0, 1, -1 (AUTO)</para>
376			</section>
377	
378			<section id="isdbt-sound-bcast">
379				<title><constant>DTV_ISDBT_SOUND_BROADCASTING</constant></title>
380	
381				<para>This field represents whether the other DTV_ISDBT_*-parameters are
382					referring to an ISDB-T and an ISDB-Tsb channel. (See also
383					<constant>DTV_ISDBT_PARTIAL_RECEPTION</constant>).</para>
384	
385				<para>Possible values: 0, 1, -1 (AUTO)</para>
386			</section>
387	
388			<section id="isdbt-sb-ch-id">
389				<title><constant>DTV_ISDBT_SB_SUBCHANNEL_ID</constant></title>
390	
391				<para>This field only applies if <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'.</para>
392	
393				<para>(Note of the author: This might not be the correct description of the
394					<constant>SUBCHANNEL-ID</constant> in all details, but it is my understanding of the technical
395					background needed to program a device)</para>
396	
397				<para>An ISDB-Tsb channel (1 or 3 segments) can be broadcasted alone or in a
398					set of connected ISDB-Tsb channels. In this set of channels every
399					channel can be received independently. The number of connected
400					ISDB-Tsb segment can vary, e.g. depending on the frequency spectrum
401					bandwidth available.</para>
402	
403				<para>Example: Assume 8 ISDB-Tsb connected segments are broadcasted. The
404					broadcaster has several possibilities to put those channels in the
405					air: Assuming a normal 13-segment ISDB-T spectrum he can align the 8
406					segments from position 1-8 to 5-13 or anything in between.</para>
407	
408				<para>The underlying layer of segments are subchannels: each segment is
409					consisting of several subchannels with a predefined IDs. A sub-channel
410					is used to help the demodulator to synchronize on the channel.</para>
411	
412				<para>An ISDB-T channel is always centered over all sub-channels. As for
413					the example above, in ISDB-Tsb it is no longer as simple as that.</para>
414	
415				<para><constant>The DTV_ISDBT_SB_SUBCHANNEL_ID</constant> parameter is used to give the
416					sub-channel ID of the segment to be demodulated.</para>
417	
418				<para>Possible values: 0 .. 41, -1 (AUTO)</para>
419			</section>
420	
421			<section id="isdbt-sb-seg-idx">
422	
423				<title><constant>DTV_ISDBT_SB_SEGMENT_IDX</constant></title>
424	
425				<para>This field only applies if <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'.</para>
426	
427				<para><constant>DTV_ISDBT_SB_SEGMENT_IDX</constant> gives the index of the segment to be
428					demodulated for an ISDB-Tsb channel where several of them are
429					transmitted in the connected manner.</para>
430	
431				<para>Possible values: 0 .. <constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant> - 1</para>
432	
433				<para>Note: This value cannot be determined by an automatic channel search.</para>
434			</section>
435	
436			<section id="isdbt-sb-seg-cnt">
437				<title><constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant></title>
438	
439				<para>This field only applies if <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> is '1'.</para>
440	
441				<para><constant>DTV_ISDBT_SB_SEGMENT_COUNT</constant> gives the total count of connected ISDB-Tsb
442					channels.</para>
443	
444				<para>Possible values: 1 .. 13</para>
445	
446				<para>Note: This value cannot be determined by an automatic channel search.</para>
447			</section>
448	
449			<section id="isdb-hierq-layers">
450				<title>Hierarchical layers</title>
451	
452				<para>ISDB-T channels can be coded hierarchically. As opposed to DVB-T in
453					ISDB-T hierarchical layers can be decoded simultaneously. For that
454					reason a ISDB-T demodulator has 3 viterbi and 3 reed-solomon-decoders.</para>
455	
456				<para>ISDB-T has 3 hierarchical layers which each can use a part of the
457					available segments. The total number of segments over all layers has
458					to 13 in ISDB-T.</para>
459	
460				<section id="isdbt-layer-ena">
461					<title><constant>DTV_ISDBT_LAYER_ENABLED</constant></title>
462	
463					<para>Hierarchical reception in ISDB-T is achieved by enabling or disabling
464						layers in the decoding process. Setting all bits of
465						<constant>DTV_ISDBT_LAYER_ENABLED</constant> to '1' forces all layers (if applicable) to be
466						demodulated. This is the default.</para>
467	
468					<para>If the channel is in the partial reception mode
469						(<constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> = 1) the central segment can be decoded
470						independently of the other 12 segments. In that mode layer A has to
471						have a <constant>SEGMENT_COUNT</constant> of 1.</para>
472	
473					<para>In ISDB-Tsb only layer A is used, it can be 1 or 3 in ISDB-Tsb
474						according to <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant>. <constant>SEGMENT_COUNT</constant> must be filled
475						accordingly.</para>
476	
477					<para>Possible values: 0x1, 0x2, 0x4 (|-able)</para>
478	
479					<para><constant>DTV_ISDBT_LAYER_ENABLED[0:0]</constant> - layer A</para>
480					<para><constant>DTV_ISDBT_LAYER_ENABLED[1:1]</constant> - layer B</para>
481					<para><constant>DTV_ISDBT_LAYER_ENABLED[2:2]</constant> - layer C</para>
482					<para><constant>DTV_ISDBT_LAYER_ENABLED[31:3]</constant> unused</para>
483				</section>
484	
485				<section id="isdbt-layer-fec">
486					<title><constant>DTV_ISDBT_LAYER*_FEC</constant></title>
487	
488					<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>
489				</section>
490	
491				<section id="isdbt-layer-mod">
492					<title><constant>DTV_ISDBT_LAYER*_MODULATION</constant></title>
493	
494					<para>Possible values: <constant>QAM_AUTO</constant>, QP<constant>SK, QAM_16</constant>, <constant>QAM_64</constant>, <constant>DQPSK</constant></para>
495	
496					<para>Note: If layer C is <constant>DQPSK</constant> layer B has to be <constant>DQPSK</constant>. If layer B is <constant>DQPSK</constant>
497						and <constant>DTV_ISDBT_PARTIAL_RECEPTION</constant>=0 layer has to be <constant>DQPSK</constant>.</para>
498				</section>
499	
500				<section id="isdbt-layer-seg-cnt">
501					<title><constant>DTV_ISDBT_LAYER*_SEGMENT_COUNT</constant></title>
502	
503					<para>Possible values: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, -1 (AUTO)</para>
504	
505					<para>Note: Truth table for <constant>DTV_ISDBT_SOUND_BROADCASTING</constant> and
506						<constant>DTV_ISDBT_PARTIAL_RECEPTION</constant> and <constant>LAYER</constant>*_SEGMENT_COUNT</para>
507	
508					<informaltable id="isdbt-layer_seg-cnt-table">
509						<tgroup cols="6">
510	
511							<tbody>
512								<row>
513									<entry>PR</entry>
514									<entry>SB</entry>
515									<entry>Layer A width</entry>
516									<entry>Layer B width</entry>
517									<entry>Layer C width</entry>
518									<entry>total width</entry>
519								</row>
520	
521								<row>
522									<entry>0</entry>
523									<entry>0</entry>
524									<entry>1 .. 13</entry>
525									<entry>1 .. 13</entry>
526									<entry>1 .. 13</entry>
527									<entry>13</entry>
528								</row>
529	
530								<row>
531									<entry>1</entry>
532									<entry>0</entry>
533									<entry>1</entry>
534									<entry>1 .. 13</entry>
535									<entry>1 .. 13</entry>
536									<entry>13</entry>
537								</row>
538	
539								<row>
540									<entry>0</entry>
541									<entry>1</entry>
542									<entry>1</entry>
543									<entry>0</entry>
544									<entry>0</entry>
545									<entry>1</entry>
546								</row>
547	
548								<row>
549									<entry>1</entry>
550									<entry>1</entry>
551									<entry>1</entry>
552									<entry>2</entry>
553									<entry>0</entry>
554									<entry>13</entry>
555								</row>
556							</tbody>
557	
558						</tgroup>
559					</informaltable>
560	
561				</section>
562	
563				<section id="isdbt_layer_t_interl">
564					<title><constant>DTV_ISDBT_LAYER*_TIME_INTERLEAVING</constant></title>
565	
566					<para>Possible values: 0, 1, 2, 3, -1 (AUTO)</para>
567	
568					<para>Note: The real inter-leaver depth-names depend on the mode (fft-size); the values
569						here are referring to what can be found in the TMCC-structure -
570						independent of the mode.</para>
571				</section>
572			</section>
573		</section>
574		<section id="dvbt2-params">
575			<title>DVB-T2 parameters</title>
576			
577			<para>This section covers parameters that apply only to the DVB-T2 delivery method. DVB-T2
578				support is currently in the early stages development so expect this section to grow
579				and become more detailed with time.</para>
580	
581			<section id="dvbt2-plp-id">
582				<title><constant>DTV_DVBT2_PLP_ID</constant></title>
583	
584				<para>DVB-T2 supports Physical Layer Pipes (PLP) to allow transmission of
585					many data types via a single multiplex. The API will soon support this
586					at which point this section will be expanded.</para>
587			</section>
588		</section>
589	</section>
590	</section>
Hide Line Numbers
About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog
Information is copyright its respective author. All material is available from the Linux Kernel Source distributed under a GPL License. This page is provided as a free service by mjmwired.net.