About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog

Documentation / DocBook / media / v4l / vidioc-g-tuner.xml




Custom Search

Based on kernel version 4.7.2. Page generated on 2016-08-22 22:45 EST.

1	<refentry id="vidioc-g-tuner">
2	  <refmeta>
3	    <refentrytitle>ioctl VIDIOC_G_TUNER, VIDIOC_S_TUNER</refentrytitle>
4	    &manvol;
5	  </refmeta>
6	
7	  <refnamediv>
8	    <refname>VIDIOC_G_TUNER</refname>
9	    <refname>VIDIOC_S_TUNER</refname>
10	    <refpurpose>Get or set tuner attributes</refpurpose>
11	  </refnamediv>
12	
13	  <refsynopsisdiv>
14	    <funcsynopsis>
15	      <funcprototype>
16		<funcdef>int <function>ioctl</function></funcdef>
17		<paramdef>int <parameter>fd</parameter></paramdef>
18		<paramdef>int <parameter>request</parameter></paramdef>
19		<paramdef>struct v4l2_tuner
20	*<parameter>argp</parameter></paramdef>
21	      </funcprototype>
22	    </funcsynopsis>
23	    <funcsynopsis>
24	      <funcprototype>
25		<funcdef>int <function>ioctl</function></funcdef>
26		<paramdef>int <parameter>fd</parameter></paramdef>
27		<paramdef>int <parameter>request</parameter></paramdef>
28		<paramdef>const struct v4l2_tuner
29	*<parameter>argp</parameter></paramdef>
30	      </funcprototype>
31	    </funcsynopsis>
32	  </refsynopsisdiv>
33	
34	  <refsect1>
35	    <title>Arguments</title>
36	
37	    <variablelist>
38	      <varlistentry>
39		<term><parameter>fd</parameter></term>
40		<listitem>
41		  <para>&fd;</para>
42		</listitem>
43	      </varlistentry>
44	      <varlistentry>
45		<term><parameter>request</parameter></term>
46		<listitem>
47		  <para>VIDIOC_G_TUNER, VIDIOC_S_TUNER</para>
48		</listitem>
49	      </varlistentry>
50	      <varlistentry>
51		<term><parameter>argp</parameter></term>
52		<listitem>
53		  <para></para>
54		</listitem>
55	      </varlistentry>
56	    </variablelist>
57	  </refsect1>
58	
59	  <refsect1>
60	    <title>Description</title>
61	
62	    <para>To query the attributes of a tuner applications initialize the
63	<structfield>index</structfield> field and zero out the
64	<structfield>reserved</structfield> array of a &v4l2-tuner; and call the
65	<constant>VIDIOC_G_TUNER</constant> ioctl with a pointer to this
66	structure. Drivers fill the rest of the structure or return an
67	&EINVAL; when the index is out of bounds. To enumerate all tuners
68	applications shall begin at index zero, incrementing by one until the
69	driver returns <errorcode>EINVAL</errorcode>.</para>
70	
71	    <para>Tuners have two writable properties, the audio mode and
72	the radio frequency. To change the audio mode, applications initialize
73	the <structfield>index</structfield>,
74	<structfield>audmode</structfield> and
75	<structfield>reserved</structfield> fields and call the
76	<constant>VIDIOC_S_TUNER</constant> ioctl. This will
77	<emphasis>not</emphasis> change the current tuner, which is determined
78	by the current video input. Drivers may choose a different audio mode
79	if the requested mode is invalid or unsupported. Since this is a
80	<!-- FIXME -->write-only ioctl, it does not return the actually
81	selected audio mode.</para>
82	
83	    <para><link linkend="sdr">SDR</link> specific tuner types are
84	<constant>V4L2_TUNER_SDR</constant> and <constant>V4L2_TUNER_RF</constant>.
85	For SDR devices <structfield>audmode</structfield> field must be
86	initialized to zero.
87	The term 'tuner' means SDR receiver in this context.</para>
88	
89	    <para>To change the radio frequency the &VIDIOC-S-FREQUENCY; ioctl
90	is available.</para>
91	
92	    <table pgwide="1" frame="none" id="v4l2-tuner">
93	      <title>struct <structname>v4l2_tuner</structname></title>
94	      <tgroup cols="3">
95		<colspec colname="c1" colwidth="1*" />
96		<colspec colname="c2" colwidth="1*" />
97		<colspec colname="c3" colwidth="1*" />
98		<colspec colname="c4" colwidth="1*" />
99		<spanspec spanname="hspan" namest="c3" nameend="c4" />
100		<tbody valign="top">
101		  <row>
102		    <entry>__u32</entry>
103		    <entry><structfield>index</structfield></entry>
104		    <entry spanname="hspan">Identifies the tuner, set by the
105	application.</entry>
106		  </row>
107		  <row>
108		    <entry>__u8</entry>
109		    <entry><structfield>name</structfield>[32]</entry>
110		    <entry spanname="hspan"><para>Name of the tuner, a
111	NUL-terminated ASCII string. This information is intended for the
112	user.<!-- FIXME Video inputs already have a name, the purpose of this
113	field is not quite clear.--></para></entry>
114		  </row>
115		  <row>
116		    <entry>__u32</entry>
117		    <entry><structfield>type</structfield></entry>
118		    <entry spanname="hspan">Type of the tuner, see <xref
119			linkend="v4l2-tuner-type" />.</entry>
120		  </row>
121		  <row>
122		    <entry>__u32</entry>
123		    <entry><structfield>capability</structfield></entry>
124		    <entry spanname="hspan"><para>Tuner capability flags, see
125	<xref linkend="tuner-capability" />. Audio flags indicate the ability
126	to decode audio subprograms. They will <emphasis>not</emphasis>
127	change, for example with the current video standard.</para><para>When
128	the structure refers to a radio tuner the
129	<constant>V4L2_TUNER_CAP_LANG1</constant>,
130	<constant>V4L2_TUNER_CAP_LANG2</constant> and
131	<constant>V4L2_TUNER_CAP_NORM</constant> flags can't be used.</para>
132	<para>If multiple frequency bands are supported, then
133	<structfield>capability</structfield> is the union of all
134	<structfield>capability</structfield> fields of each &v4l2-frequency-band;.
135	</para></entry>
136		  </row>
137		  <row>
138		    <entry>__u32</entry>
139		    <entry><structfield>rangelow</structfield></entry>
140		    <entry spanname="hspan">The lowest tunable frequency in
141	units of 62.5 kHz, or if the <structfield>capability</structfield>
142	flag <constant>V4L2_TUNER_CAP_LOW</constant> is set, in units of 62.5
143	Hz, or if the <structfield>capability</structfield> flag
144	<constant>V4L2_TUNER_CAP_1HZ</constant> is set, in units of 1 Hz.
145	If multiple frequency bands are supported, then
146	<structfield>rangelow</structfield> is the lowest frequency
147	of all the frequency bands.</entry>
148		  </row>
149		  <row>
150		    <entry>__u32</entry>
151		    <entry><structfield>rangehigh</structfield></entry>
152		    <entry spanname="hspan">The highest tunable frequency in
153	units of 62.5 kHz, or if the <structfield>capability</structfield>
154	flag <constant>V4L2_TUNER_CAP_LOW</constant> is set, in units of 62.5
155	Hz, or if the <structfield>capability</structfield> flag
156	<constant>V4L2_TUNER_CAP_1HZ</constant> is set, in units of 1 Hz.
157	If multiple frequency bands are supported, then
158	<structfield>rangehigh</structfield> is the highest frequency
159	of all the frequency bands.</entry>
160		  </row>
161		  <row>
162		    <entry>__u32</entry>
163		    <entry><structfield>rxsubchans</structfield></entry>
164		    <entry spanname="hspan"><para>Some tuners or audio
165	decoders can determine the received audio subprograms by analyzing
166	audio carriers, pilot tones or other indicators. To pass this
167	information drivers set flags defined in <xref
168			  linkend="tuner-rxsubchans" /> in this field. For
169	example:</para></entry>
170		  </row>
171		  <row>
172		    <entry></entry>
173		    <entry></entry>
174		    <entry><constant>V4L2_TUNER_SUB_MONO</constant></entry>
175		    <entry>receiving mono audio</entry>
176		  </row>
177		  <row>
178		    <entry></entry>
179		    <entry></entry>
180		    <entry><constant>STEREO | SAP</constant></entry>
181		    <entry>receiving stereo audio and a secondary audio
182	program</entry>
183		  </row>
184		  <row>
185		    <entry></entry>
186		    <entry></entry>
187		    <entry><constant>MONO | STEREO</constant></entry>
188		    <entry>receiving mono or stereo audio, the hardware cannot
189	distinguish</entry>
190		  </row>
191		  <row>
192		    <entry></entry>
193		    <entry></entry>
194		    <entry><constant>LANG1 | LANG2</constant></entry>
195		    <entry>receiving bilingual audio</entry>
196		  </row>
197		  <row>
198		    <entry></entry>
199		    <entry></entry>
200		    <entry><constant>MONO | STEREO | LANG1 | LANG2</constant></entry>
201		    <entry>receiving mono, stereo or bilingual
202	audio</entry>
203		  </row>
204		  <row>
205		    <entry></entry>
206		    <entry></entry>
207		    <entry spanname="hspan"><para>When the
208	<constant>V4L2_TUNER_CAP_STEREO</constant>,
209	<constant>_LANG1</constant>, <constant>_LANG2</constant> or
210	<constant>_SAP</constant> flag is cleared in the
211	<structfield>capability</structfield> field, the corresponding
212	<constant>V4L2_TUNER_SUB_</constant> flag must not be set
213	here.</para><para>This field is valid only if this is the tuner of the
214	current video input, or when the structure refers to a radio
215	tuner.</para></entry>
216		  </row>
217		  <row>
218		    <entry>__u32</entry>
219		    <entry><structfield>audmode</structfield></entry>
220		    <entry spanname="hspan"><para>The selected audio mode, see
221	<xref linkend="tuner-audmode" /> for valid values. The audio mode does
222	not affect audio subprogram detection, and like a <link
223	linkend="control">control</link> it does not automatically change
224	unless the requested mode is invalid or unsupported. See <xref
225			  linkend="tuner-matrix" /> for possible results when
226	the selected and received audio programs do not
227	match.</para><para>Currently this is the only field of struct
228	<structname>v4l2_tuner</structname> applications can
229	change.</para></entry>
230		  </row>
231		  <row>
232		    <entry>__u32</entry>
233		    <entry><structfield>signal</structfield></entry>
234		    <entry spanname="hspan">The signal strength if known, ranging
235	from 0 to 65535. Higher values indicate a better signal.</entry>
236		  </row>
237		  <row>
238		    <entry>__s32</entry>
239		    <entry><structfield>afc</structfield></entry>
240		    <entry spanname="hspan">Automatic frequency control: When the
241	<structfield>afc</structfield> value is negative, the frequency is too
242	low, when positive too high.<!-- FIXME need example what to do when it never
243	settles at zero, &ie; range is what? --></entry>
244		  </row>
245		  <row>
246		    <entry>__u32</entry>
247		    <entry><structfield>reserved</structfield>[4]</entry>
248		    <entry spanname="hspan">Reserved for future extensions. Drivers and
249	applications must set the array to zero.</entry>
250		  </row>
251		</tbody>
252	      </tgroup>
253	    </table>
254	
255	    <table pgwide="1" frame="none" id="v4l2-tuner-type">
256	      <title>enum v4l2_tuner_type</title>
257	      <tgroup cols="3">
258		&cs-def;
259		<tbody valign="top">
260		  <row>
261		    <entry><constant>V4L2_TUNER_RADIO</constant></entry>
262		    <entry>1</entry>
263		    <entry></entry>
264		  </row>
265		  <row>
266		    <entry><constant>V4L2_TUNER_ANALOG_TV</constant></entry>
267		    <entry>2</entry>
268		    <entry></entry>
269		  </row>
270		  <row>
271		    <entry><constant>V4L2_TUNER_SDR</constant></entry>
272		    <entry>4</entry>
273		    <entry></entry>
274		  </row>
275		  <row>
276		    <entry><constant>V4L2_TUNER_RF</constant></entry>
277		    <entry>5</entry>
278		    <entry></entry>
279		  </row>
280		</tbody>
281	      </tgroup>
282	    </table>
283	
284	    <table pgwide="1" frame="none" id="tuner-capability">
285	      <title>Tuner and Modulator Capability Flags</title>
286	      <tgroup cols="3">
287		&cs-def;
288		<tbody valign="top">
289		  <row>
290		    <entry><constant>V4L2_TUNER_CAP_LOW</constant></entry>
291		    <entry>0x0001</entry>
292		    <entry>When set, tuning frequencies are expressed in units of
293	62.5 Hz instead of 62.5 kHz.</entry>
294		  </row>
295		  <row>
296		    <entry><constant>V4L2_TUNER_CAP_NORM</constant></entry>
297		    <entry>0x0002</entry>
298		    <entry>This is a multi-standard tuner; the video standard
299	can or must be switched. (B/G PAL tuners for example are typically not
300	      considered multi-standard because the video standard is automatically
301	      determined from the frequency band.) The set of supported video
302	      standards is available from the &v4l2-input; pointing to this tuner,
303	      see the description of ioctl &VIDIOC-ENUMINPUT; for details. Only
304	      <constant>V4L2_TUNER_ANALOG_TV</constant> tuners can have this capability.</entry>
305		  </row>
306		  <row>
307		    <entry><constant>V4L2_TUNER_CAP_HWSEEK_BOUNDED</constant></entry>
308		    <entry>0x0004</entry>
309		    <entry>If set, then this tuner supports the hardware seek functionality
310		    where the seek stops when it reaches the end of the frequency range.</entry>
311		  </row>
312		  <row>
313		    <entry><constant>V4L2_TUNER_CAP_HWSEEK_WRAP</constant></entry>
314		    <entry>0x0008</entry>
315		    <entry>If set, then this tuner supports the hardware seek functionality
316		    where the seek wraps around when it reaches the end of the frequency range.</entry>
317		  </row>
318		  <row>
319		<entry><constant>V4L2_TUNER_CAP_STEREO</constant></entry>
320		<entry>0x0010</entry>
321		<entry>Stereo audio reception is supported.</entry>
322		  </row>
323		  <row>
324		    <entry><constant>V4L2_TUNER_CAP_LANG1</constant></entry>
325		    <entry>0x0040</entry>
326		    <entry>Reception of the primary language of a bilingual
327	audio program is supported. Bilingual audio is a feature of
328	two-channel systems, transmitting the primary language monaural on the
329	main audio carrier and a secondary language monaural on a second
330	carrier. Only
331	      <constant>V4L2_TUNER_ANALOG_TV</constant> tuners can have this capability.</entry>
332		  </row>
333		  <row>
334		    <entry><constant>V4L2_TUNER_CAP_LANG2</constant></entry>
335		    <entry>0x0020</entry>
336		    <entry>Reception of the secondary language of a bilingual
337	audio program is supported. Only
338	      <constant>V4L2_TUNER_ANALOG_TV</constant> tuners can have this capability.</entry>
339		  </row>
340		  <row>
341		    <entry><constant>V4L2_TUNER_CAP_SAP</constant></entry>
342		    <entry>0x0020</entry>
343		    <entry><para>Reception of a secondary audio program is
344	supported. This is a feature of the BTSC system which accompanies the
345	NTSC video standard. Two audio carriers are available for mono or
346	stereo transmissions of a primary language, and an independent third
347	carrier for a monaural secondary language. Only
348	      <constant>V4L2_TUNER_ANALOG_TV</constant> tuners can have this capability.</para><para>Note the
349	<constant>V4L2_TUNER_CAP_LANG2</constant> and
350	<constant>V4L2_TUNER_CAP_SAP</constant> flags are synonyms.
351	<constant>V4L2_TUNER_CAP_SAP</constant> applies when the tuner
352	supports the <constant>V4L2_STD_NTSC_M</constant> video
353	standard.</para><!-- FIXME what if PAL+NTSC and Bi but not SAP? --></entry>
354		  </row>
355		  <row>
356		<entry><constant>V4L2_TUNER_CAP_RDS</constant></entry>
357		<entry>0x0080</entry>
358		<entry>RDS capture is supported. This capability is only valid for
359	radio tuners.</entry>
360		  </row>
361		  <row>
362		<entry><constant>V4L2_TUNER_CAP_RDS_BLOCK_IO</constant></entry>
363		<entry>0x0100</entry>
364		<entry>The RDS data is passed as unparsed RDS blocks.</entry>
365		  </row>
366		  <row>
367		<entry><constant>V4L2_TUNER_CAP_RDS_CONTROLS</constant></entry>
368		<entry>0x0200</entry>
369		<entry>The RDS data is parsed by the hardware and set via controls.</entry>
370		  </row>
371		  <row>
372		<entry><constant>V4L2_TUNER_CAP_FREQ_BANDS</constant></entry>
373		<entry>0x0400</entry>
374		<entry>The &VIDIOC-ENUM-FREQ-BANDS; ioctl can be used to enumerate
375		the available frequency bands.</entry>
376		  </row>
377		  <row>
378		<entry><constant>V4L2_TUNER_CAP_HWSEEK_PROG_LIM</constant></entry>
379		<entry>0x0800</entry>
380		<entry>The range to search when using the hardware seek functionality
381		is programmable, see &VIDIOC-S-HW-FREQ-SEEK; for details.</entry>
382		  </row>
383		  <row>
384		<entry><constant>V4L2_TUNER_CAP_1HZ</constant></entry>
385		<entry>0x1000</entry>
386		<entry>When set, tuning frequencies are expressed in units of 1 Hz instead of 62.5 kHz.</entry>
387		  </row>
388		</tbody>
389	      </tgroup>
390	    </table>
391	
392	    <table pgwide="1" frame="none" id="tuner-rxsubchans">
393	      <title>Tuner Audio Reception Flags</title>
394	      <tgroup cols="3">
395		&cs-def;
396		<tbody valign="top">
397		  <row>
398		    <entry><constant>V4L2_TUNER_SUB_MONO</constant></entry>
399		    <entry>0x0001</entry>
400		    <entry>The tuner receives a mono audio signal.</entry>
401		  </row>
402		  <row>
403		    <entry><constant>V4L2_TUNER_SUB_STEREO</constant></entry>
404		    <entry>0x0002</entry>
405		    <entry>The tuner receives a stereo audio signal.</entry>
406		  </row>
407		  <row>
408		    <entry><constant>V4L2_TUNER_SUB_LANG1</constant></entry>
409		    <entry>0x0008</entry>
410		    <entry>The tuner receives the primary language of a
411	bilingual audio signal. Drivers must clear this flag when the current
412	video standard is <constant>V4L2_STD_NTSC_M</constant>.</entry>
413		  </row>
414		  <row>
415		    <entry><constant>V4L2_TUNER_SUB_LANG2</constant></entry>
416		    <entry>0x0004</entry>
417		    <entry>The tuner receives the secondary language of a
418	bilingual audio signal (or a second audio program).</entry>
419		  </row>
420		  <row>
421		    <entry><constant>V4L2_TUNER_SUB_SAP</constant></entry>
422		    <entry>0x0004</entry>
423		    <entry>The tuner receives a Second Audio Program. Note the
424	<constant>V4L2_TUNER_SUB_LANG2</constant> and
425	<constant>V4L2_TUNER_SUB_SAP</constant> flags are synonyms. The
426	<constant>V4L2_TUNER_SUB_SAP</constant> flag applies when the
427	current video standard is <constant>V4L2_STD_NTSC_M</constant>.</entry>
428		  </row>
429		  <row>
430		    <entry><constant>V4L2_TUNER_SUB_RDS</constant></entry>
431		    <entry>0x0010</entry>
432		    <entry>The tuner receives an RDS channel.</entry>
433		  </row>
434		</tbody>
435	      </tgroup>
436	    </table>
437	
438	    <table pgwide="1" frame="none" id="tuner-audmode">
439	      <title>Tuner Audio Modes</title>
440	      <tgroup cols="3">
441		&cs-def;
442		<tbody valign="top">
443		  <row>
444		    <entry><constant>V4L2_TUNER_MODE_MONO</constant></entry>
445		    <entry>0</entry>
446		    <entry>Play mono audio. When the tuner receives a stereo
447	signal this a down-mix of the left and right channel. When the tuner
448	receives a bilingual or SAP signal this mode selects the primary
449	language.</entry>
450		  </row>
451		  <row>
452		    <entry><constant>V4L2_TUNER_MODE_STEREO</constant></entry>
453		    <entry>1</entry>
454		    <entry><para>Play stereo audio. When the tuner receives
455	bilingual audio it may play different languages on the left and right
456	channel or the primary language is played on both channels.</para><para>Playing
457	different languages in this mode is
458	deprecated. New drivers should do this only in
459	<constant>MODE_LANG1_LANG2</constant>.</para><para>When the tuner
460	receives no stereo signal or does not support stereo reception the
461	driver shall fall back to <constant>MODE_MONO</constant>.</para></entry>
462		  </row>
463		  <row>
464		    <entry><constant>V4L2_TUNER_MODE_LANG1</constant></entry>
465		    <entry>3</entry>
466		    <entry>Play the primary language, mono or stereo. Only
467	<constant>V4L2_TUNER_ANALOG_TV</constant> tuners support this
468	mode.</entry>
469		  </row>
470		  <row>
471		    <entry><constant>V4L2_TUNER_MODE_LANG2</constant></entry>
472		    <entry>2</entry>
473		    <entry>Play the secondary language, mono. When the tuner
474	receives no bilingual audio or SAP, or their reception is not
475	supported the driver shall fall back to mono or stereo mode. Only
476	<constant>V4L2_TUNER_ANALOG_TV</constant> tuners support this
477	mode.</entry>
478		  </row>
479		  <row>
480		    <entry><constant>V4L2_TUNER_MODE_SAP</constant></entry>
481		    <entry>2</entry>
482		    <entry>Play the Second Audio Program. When the tuner
483	receives no bilingual audio or SAP, or their reception is not
484	supported the driver shall fall back to mono or stereo mode. Only
485	<constant>V4L2_TUNER_ANALOG_TV</constant> tuners support this mode.
486	Note the <constant>V4L2_TUNER_MODE_LANG2</constant> and
487	<constant>V4L2_TUNER_MODE_SAP</constant> are synonyms.</entry>
488		  </row>
489		  <row>
490		    <entry><constant>V4L2_TUNER_MODE_LANG1_LANG2</constant></entry>
491		    <entry>4</entry>
492		    <entry>Play the primary language on the left channel, the
493	secondary language on the right channel. When the tuner receives no
494	bilingual audio or SAP, it shall fall back to
495	<constant>MODE_LANG1</constant> or <constant>MODE_MONO</constant>.
496	Only <constant>V4L2_TUNER_ANALOG_TV</constant> tuners support this
497	mode.</entry>
498		  </row>
499		</tbody>
500	      </tgroup>
501	    </table>
502	
503	    <table pgwide="1" frame="all" id="tuner-matrix">
504	      <title>Tuner Audio Matrix</title>
505	      <tgroup cols="6" align="center">
506		<colspec align="left" />
507		<colspec colname="c2" colwidth="1*" />
508		<colspec colwidth="1*" />
509		<colspec colwidth="1*" />
510		<colspec colnum="6" colname="c6" colwidth="1*" />
511		<spanspec namest="c2" nameend="c6" spanname="hspan" align="center" />
512		<thead>
513		  <row>
514		    <entry></entry>
515		    <entry spanname="hspan">Selected
516	<constant>V4L2_TUNER_MODE_</constant></entry>
517		  </row>
518		  <row>
519		    <entry>Received <constant>V4L2_TUNER_SUB_</constant></entry>
520		    <entry><constant>MONO</constant></entry>
521		    <entry><constant>STEREO</constant></entry>
522		    <entry><constant>LANG1</constant></entry>
523		    <entry><constant>LANG2 = SAP</constant></entry>
524		    <entry><constant>LANG1_LANG2</constant><footnote><para>This
525	mode has been added in Linux 2.6.17 and may not be supported by older
526	drivers.</para></footnote></entry>
527		  </row>
528		</thead>
529		<tbody valign="top">
530		  <row>
531		    <entry><constant>MONO</constant></entry>
532		    <entry>Mono</entry>
533		    <entry>Mono/Mono</entry>
534		    <entry>Mono</entry>
535		    <entry>Mono</entry>
536		    <entry>Mono/Mono</entry>
537		  </row>
538		  <row>
539		    <entry><constant>MONO | SAP</constant></entry>
540		    <entry>Mono</entry>
541		    <entry>Mono/Mono</entry>
542		    <entry>Mono</entry>
543		    <entry>SAP</entry>
544		    <entry>Mono/SAP (preferred) or Mono/Mono</entry>
545		  </row>
546		  <row>
547		    <entry><constant>STEREO</constant></entry>
548		    <entry>L+R</entry>
549		    <entry>L/R</entry>
550		    <entry>Stereo L/R (preferred) or Mono L+R</entry>
551		    <entry>Stereo L/R (preferred) or Mono L+R</entry>
552		    <entry>L/R (preferred) or L+R/L+R</entry>
553		  </row>
554		  <row>
555		    <entry><constant>STEREO | SAP</constant></entry>
556		    <entry>L+R</entry>
557		    <entry>L/R</entry>
558		    <entry>Stereo L/R (preferred) or Mono L+R</entry>
559		    <entry>SAP</entry>
560		    <entry>L+R/SAP (preferred) or L/R or L+R/L+R</entry>
561		  </row>
562		  <row>
563		    <entry><constant>LANG1 | LANG2</constant></entry>
564		    <entry>Language&nbsp;1</entry>
565		    <entry>Lang1/Lang2 (deprecated<footnote><para>Playback of
566	both languages in <constant>MODE_STEREO</constant> is deprecated. In
567	the future drivers should produce only the primary language in this
568	mode. Applications should request
569	<constant>MODE_LANG1_LANG2</constant> to record both languages or a
570	stereo signal.</para></footnote>) or
571	Lang1/Lang1</entry>
572		    <entry>Language&nbsp;1</entry>
573		    <entry>Language&nbsp;2</entry>
574		    <entry>Lang1/Lang2 (preferred) or Lang1/Lang1</entry>
575		  </row>
576		</tbody>
577	      </tgroup>
578	    </table>
579	  </refsect1>
580	
581	  <refsect1>
582	    &return-value;
583	
584	    <variablelist>
585	      <varlistentry>
586		<term><errorcode>EINVAL</errorcode></term>
587		<listitem>
588		  <para>The &v4l2-tuner; <structfield>index</structfield> is
589	out of bounds.</para>
590		</listitem>
591	      </varlistentry>
592	    </variablelist>
593	  </refsect1>
594	</refentry>
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.