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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>To change the radio frequency the &VIDIOC-S-FREQUENCY; ioctl | |
84 | is available.</para> | |
85 | ||
86 | <table pgwide="1" frame="none" id="v4l2-tuner"> | |
87 | <title>struct <structname>v4l2_tuner</structname></title> | |
88 | <tgroup cols="3"> | |
89 | <colspec colname="c1" colwidth="1*" /> | |
90 | <colspec colname="c2" colwidth="1*" /> | |
91 | <colspec colname="c3" colwidth="1*" /> | |
92 | <colspec colname="c4" colwidth="1*" /> | |
93 | <spanspec spanname="hspan" namest="c3" nameend="c4" /> | |
94 | <tbody valign="top"> | |
95 | <row> | |
96 | <entry>__u32</entry> | |
97 | <entry><structfield>index</structfield></entry> | |
98 | <entry spanname="hspan">Identifies the tuner, set by the | |
99 | application.</entry> | |
100 | </row> | |
101 | <row> | |
102 | <entry>__u8</entry> | |
103 | <entry><structfield>name</structfield>[32]</entry> | |
104 | <entry spanname="hspan"><para>Name of the tuner, a | |
105 | NUL-terminated ASCII string. This information is intended for the | |
106 | user.<!-- FIXME Video inputs already have a name, the purpose of this | |
107 | field is not quite clear.--></para></entry> | |
108 | </row> | |
109 | <row> | |
110 | <entry>&v4l2-tuner-type;</entry> | |
111 | <entry><structfield>type</structfield></entry> | |
112 | <entry spanname="hspan">Type of the tuner, see <xref | |
113 | linkend="v4l2-tuner-type" />.</entry> | |
114 | </row> | |
115 | <row> | |
116 | <entry>__u32</entry> | |
117 | <entry><structfield>capability</structfield></entry> | |
118 | <entry spanname="hspan"><para>Tuner capability flags, see | |
119 | <xref linkend="tuner-capability" />. Audio flags indicate the ability | |
120 | to decode audio subprograms. They will <emphasis>not</emphasis> | |
121 | change, for example with the current video standard.</para><para>When | |
122 | the structure refers to a radio tuner only the | |
123 | <constant>V4L2_TUNER_CAP_LOW</constant>, | |
124 | <constant>V4L2_TUNER_CAP_STEREO</constant> and | |
125 | <constant>V4L2_TUNER_CAP_RDS</constant> flags can be set.</para></entry> | |
126 | </row> | |
127 | <row> | |
128 | <entry>__u32</entry> | |
129 | <entry><structfield>rangelow</structfield></entry> | |
130 | <entry spanname="hspan">The lowest tunable frequency in | |
131 | units of 62.5 kHz, or if the <structfield>capability</structfield> | |
132 | flag <constant>V4L2_TUNER_CAP_LOW</constant> is set, in units of 62.5 | |
133 | Hz.</entry> | |
134 | </row> | |
135 | <row> | |
136 | <entry>__u32</entry> | |
137 | <entry><structfield>rangehigh</structfield></entry> | |
138 | <entry spanname="hspan">The highest tunable frequency in | |
139 | units of 62.5 kHz, or if the <structfield>capability</structfield> | |
140 | flag <constant>V4L2_TUNER_CAP_LOW</constant> is set, in units of 62.5 | |
141 | Hz.</entry> | |
142 | </row> | |
143 | <row> | |
144 | <entry>__u32</entry> | |
145 | <entry><structfield>rxsubchans</structfield></entry> | |
146 | <entry spanname="hspan"><para>Some tuners or audio | |
147 | decoders can determine the received audio subprograms by analyzing | |
148 | audio carriers, pilot tones or other indicators. To pass this | |
149 | information drivers set flags defined in <xref | |
150 | linkend="tuner-rxsubchans" /> in this field. For | |
151 | example:</para></entry> | |
152 | </row> | |
153 | <row> | |
154 | <entry></entry> | |
155 | <entry></entry> | |
156 | <entry><constant>V4L2_TUNER_SUB_MONO</constant></entry> | |
157 | <entry>receiving mono audio</entry> | |
158 | </row> | |
159 | <row> | |
160 | <entry></entry> | |
161 | <entry></entry> | |
162 | <entry><constant>STEREO | SAP</constant></entry> | |
163 | <entry>receiving stereo audio and a secondary audio | |
164 | program</entry> | |
165 | </row> | |
166 | <row> | |
167 | <entry></entry> | |
168 | <entry></entry> | |
169 | <entry><constant>MONO | STEREO</constant></entry> | |
170 | <entry>receiving mono or stereo audio, the hardware cannot | |
171 | distinguish</entry> | |
172 | </row> | |
173 | <row> | |
174 | <entry></entry> | |
175 | <entry></entry> | |
176 | <entry><constant>LANG1 | LANG2</constant></entry> | |
177 | <entry>receiving bilingual audio</entry> | |
178 | </row> | |
179 | <row> | |
180 | <entry></entry> | |
181 | <entry></entry> | |
182 | <entry><constant>MONO | STEREO | LANG1 | LANG2</constant></entry> | |
183 | <entry>receiving mono, stereo or bilingual | |
184 | audio</entry> | |
185 | </row> | |
186 | <row> | |
187 | <entry></entry> | |
188 | <entry></entry> | |
189 | <entry spanname="hspan"><para>When the | |
190 | <constant>V4L2_TUNER_CAP_STEREO</constant>, | |
191 | <constant>_LANG1</constant>, <constant>_LANG2</constant> or | |
192 | <constant>_SAP</constant> flag is cleared in the | |
193 | <structfield>capability</structfield> field, the corresponding | |
194 | <constant>V4L2_TUNER_SUB_</constant> flag must not be set | |
195 | here.</para><para>This field is valid only if this is the tuner of the | |
196 | current video input, or when the structure refers to a radio | |
197 | tuner.</para></entry> | |
198 | </row> | |
199 | <row> | |
200 | <entry>__u32</entry> | |
201 | <entry><structfield>audmode</structfield></entry> | |
202 | <entry spanname="hspan"><para>The selected audio mode, see | |
203 | <xref linkend="tuner-audmode" /> for valid values. The audio mode does | |
204 | not affect audio subprogram detection, and like a <link | |
205 | linkend="control">control</link> it does not automatically change | |
206 | unless the requested mode is invalid or unsupported. See <xref | |
207 | linkend="tuner-matrix" /> for possible results when | |
208 | the selected and received audio programs do not | |
209 | match.</para><para>Currently this is the only field of struct | |
210 | <structname>v4l2_tuner</structname> applications can | |
211 | change.</para></entry> | |
212 | </row> | |
213 | <row> | |
214 | <entry>__u32</entry> | |
215 | <entry><structfield>signal</structfield></entry> | |
216 | <entry spanname="hspan">The signal strength if known, ranging | |
217 | from 0 to 65535. Higher values indicate a better signal.</entry> | |
218 | </row> | |
219 | <row> | |
220 | <entry>__s32</entry> | |
221 | <entry><structfield>afc</structfield></entry> | |
222 | <entry spanname="hspan">Automatic frequency control: When the | |
223 | <structfield>afc</structfield> value is negative, the frequency is too | |
224 | low, when positive too high.<!-- FIXME need example what to do when it never | |
225 | settles at zero, &ie; range is what? --></entry> | |
226 | </row> | |
227 | <row> | |
228 | <entry>__u32</entry> | |
229 | <entry><structfield>reserved</structfield>[4]</entry> | |
230 | <entry spanname="hspan">Reserved for future extensions. Drivers and | |
231 | applications must set the array to zero.</entry> | |
232 | </row> | |
233 | </tbody> | |
234 | </tgroup> | |
235 | </table> | |
236 | ||
237 | <table pgwide="1" frame="none" id="v4l2-tuner-type"> | |
238 | <title>enum v4l2_tuner_type</title> | |
239 | <tgroup cols="3"> | |
240 | &cs-def; | |
241 | <tbody valign="top"> | |
242 | <row> | |
243 | <entry><constant>V4L2_TUNER_RADIO</constant></entry> | |
244 | <entry>1</entry> | |
245 | <entry></entry> | |
246 | </row> | |
247 | <row> | |
248 | <entry><constant>V4L2_TUNER_ANALOG_TV</constant></entry> | |
249 | <entry>2</entry> | |
250 | <entry></entry> | |
251 | </row> | |
252 | </tbody> | |
253 | </tgroup> | |
254 | </table> | |
255 | ||
256 | <table pgwide="1" frame="none" id="tuner-capability"> | |
257 | <title>Tuner and Modulator Capability Flags</title> | |
258 | <tgroup cols="3"> | |
259 | &cs-def; | |
260 | <tbody valign="top"> | |
261 | <row> | |
262 | <entry><constant>V4L2_TUNER_CAP_LOW</constant></entry> | |
263 | <entry>0x0001</entry> | |
264 | <entry>When set, tuning frequencies are expressed in units of | |
265 | 62.5 Hz, otherwise in units of 62.5 kHz.</entry> | |
266 | </row> | |
267 | <row> | |
268 | <entry><constant>V4L2_TUNER_CAP_NORM</constant></entry> | |
269 | <entry>0x0002</entry> | |
270 | <entry>This is a multi-standard tuner; the video standard | |
271 | can or must be switched. (B/G PAL tuners for example are typically not | |
272 | considered multi-standard because the video standard is automatically | |
273 | determined from the frequency band.) The set of supported video | |
274 | standards is available from the &v4l2-input; pointing to this tuner, | |
275 | see the description of ioctl &VIDIOC-ENUMINPUT; for details. Only | |
276 | <constant>V4L2_TUNER_ANALOG_TV</constant> tuners can have this capability.</entry> | |
277 | </row> | |
278 | <row> | |
279 | <entry><constant>V4L2_TUNER_CAP_STEREO</constant></entry> | |
280 | <entry>0x0010</entry> | |
281 | <entry>Stereo audio reception is supported.</entry> | |
282 | </row> | |
283 | <row> | |
284 | <entry><constant>V4L2_TUNER_CAP_LANG1</constant></entry> | |
285 | <entry>0x0040</entry> | |
286 | <entry>Reception of the primary language of a bilingual | |
287 | audio program is supported. Bilingual audio is a feature of | |
288 | two-channel systems, transmitting the primary language monaural on the | |
289 | main audio carrier and a secondary language monaural on a second | |
290 | carrier. Only | |
291 | <constant>V4L2_TUNER_ANALOG_TV</constant> tuners can have this capability.</entry> | |
292 | </row> | |
293 | <row> | |
294 | <entry><constant>V4L2_TUNER_CAP_LANG2</constant></entry> | |
295 | <entry>0x0020</entry> | |
296 | <entry>Reception of the secondary language of a bilingual | |
297 | audio program is supported. Only | |
298 | <constant>V4L2_TUNER_ANALOG_TV</constant> tuners can have this capability.</entry> | |
299 | </row> | |
300 | <row> | |
301 | <entry><constant>V4L2_TUNER_CAP_SAP</constant></entry> | |
302 | <entry>0x0020</entry> | |
303 | <entry><para>Reception of a secondary audio program is | |
304 | supported. This is a feature of the BTSC system which accompanies the | |
305 | NTSC video standard. Two audio carriers are available for mono or | |
306 | stereo transmissions of a primary language, and an independent third | |
307 | carrier for a monaural secondary language. Only | |
308 | <constant>V4L2_TUNER_ANALOG_TV</constant> tuners can have this capability.</para><para>Note the | |
309 | <constant>V4L2_TUNER_CAP_LANG2</constant> and | |
310 | <constant>V4L2_TUNER_CAP_SAP</constant> flags are synonyms. | |
311 | <constant>V4L2_TUNER_CAP_SAP</constant> applies when the tuner | |
312 | supports the <constant>V4L2_STD_NTSC_M</constant> video | |
313 | standard.</para><!-- FIXME what if PAL+NTSC and Bi but not SAP? --></entry> | |
314 | </row> | |
315 | <row> | |
316 | <entry><constant>V4L2_TUNER_CAP_RDS</constant></entry> | |
317 | <entry>0x0080</entry> | |
318 | <entry>RDS capture is supported. This capability is only valid for | |
319 | radio tuners.</entry> | |
320 | </row> | |
146d35b0 HV |
321 | <row> |
322 | <entry><constant>V4L2_TUNER_CAP_RDS_BLOCK_IO</constant></entry> | |
323 | <entry>0x0100</entry> | |
324 | <entry>The RDS data is passed as unparsed RDS blocks.</entry> | |
325 | </row> | |
326 | <row> | |
327 | <entry><constant>V4L2_TUNER_CAP_RDS_CONTROLS</constant></entry> | |
328 | <entry>0x0200</entry> | |
329 | <entry>The RDS data is parsed by the hardware and set via controls.</entry> | |
330 | </row> | |
8e080c2e MCC |
331 | </tbody> |
332 | </tgroup> | |
333 | </table> | |
334 | ||
335 | <table pgwide="1" frame="none" id="tuner-rxsubchans"> | |
336 | <title>Tuner Audio Reception Flags</title> | |
337 | <tgroup cols="3"> | |
338 | &cs-def; | |
339 | <tbody valign="top"> | |
340 | <row> | |
341 | <entry><constant>V4L2_TUNER_SUB_MONO</constant></entry> | |
342 | <entry>0x0001</entry> | |
343 | <entry>The tuner receives a mono audio signal.</entry> | |
344 | </row> | |
345 | <row> | |
346 | <entry><constant>V4L2_TUNER_SUB_STEREO</constant></entry> | |
347 | <entry>0x0002</entry> | |
348 | <entry>The tuner receives a stereo audio signal.</entry> | |
349 | </row> | |
350 | <row> | |
351 | <entry><constant>V4L2_TUNER_SUB_LANG1</constant></entry> | |
352 | <entry>0x0008</entry> | |
353 | <entry>The tuner receives the primary language of a | |
354 | bilingual audio signal. Drivers must clear this flag when the current | |
355 | video standard is <constant>V4L2_STD_NTSC_M</constant>.</entry> | |
356 | </row> | |
357 | <row> | |
358 | <entry><constant>V4L2_TUNER_SUB_LANG2</constant></entry> | |
359 | <entry>0x0004</entry> | |
360 | <entry>The tuner receives the secondary language of a | |
361 | bilingual audio signal (or a second audio program).</entry> | |
362 | </row> | |
363 | <row> | |
364 | <entry><constant>V4L2_TUNER_SUB_SAP</constant></entry> | |
365 | <entry>0x0004</entry> | |
366 | <entry>The tuner receives a Second Audio Program. Note the | |
367 | <constant>V4L2_TUNER_SUB_LANG2</constant> and | |
368 | <constant>V4L2_TUNER_SUB_SAP</constant> flags are synonyms. The | |
369 | <constant>V4L2_TUNER_SUB_SAP</constant> flag applies when the | |
370 | current video standard is <constant>V4L2_STD_NTSC_M</constant>.</entry> | |
371 | </row> | |
372 | <row> | |
373 | <entry><constant>V4L2_TUNER_SUB_RDS</constant></entry> | |
374 | <entry>0x0010</entry> | |
375 | <entry>The tuner receives an RDS channel.</entry> | |
376 | </row> | |
377 | </tbody> | |
378 | </tgroup> | |
379 | </table> | |
380 | ||
381 | <table pgwide="1" frame="none" id="tuner-audmode"> | |
382 | <title>Tuner Audio Modes</title> | |
383 | <tgroup cols="3"> | |
384 | &cs-def; | |
385 | <tbody valign="top"> | |
386 | <row> | |
387 | <entry><constant>V4L2_TUNER_MODE_MONO</constant></entry> | |
388 | <entry>0</entry> | |
389 | <entry>Play mono audio. When the tuner receives a stereo | |
390 | signal this a down-mix of the left and right channel. When the tuner | |
391 | receives a bilingual or SAP signal this mode selects the primary | |
392 | language.</entry> | |
393 | </row> | |
394 | <row> | |
395 | <entry><constant>V4L2_TUNER_MODE_STEREO</constant></entry> | |
396 | <entry>1</entry> | |
397 | <entry><para>Play stereo audio. When the tuner receives | |
398 | bilingual audio it may play different languages on the left and right | |
399 | channel or the primary language is played on both channels.</para><para>Playing | |
400 | different languages in this mode is | |
401 | deprecated. New drivers should do this only in | |
402 | <constant>MODE_LANG1_LANG2</constant>.</para><para>When the tuner | |
403 | receives no stereo signal or does not support stereo reception the | |
404 | driver shall fall back to <constant>MODE_MONO</constant>.</para></entry> | |
405 | </row> | |
406 | <row> | |
407 | <entry><constant>V4L2_TUNER_MODE_LANG1</constant></entry> | |
408 | <entry>3</entry> | |
409 | <entry>Play the primary language, mono or stereo. Only | |
410 | <constant>V4L2_TUNER_ANALOG_TV</constant> tuners support this | |
411 | mode.</entry> | |
412 | </row> | |
413 | <row> | |
414 | <entry><constant>V4L2_TUNER_MODE_LANG2</constant></entry> | |
415 | <entry>2</entry> | |
416 | <entry>Play the secondary language, mono. When the tuner | |
417 | receives no bilingual audio or SAP, or their reception is not | |
418 | supported the driver shall fall back to mono or stereo mode. Only | |
419 | <constant>V4L2_TUNER_ANALOG_TV</constant> tuners support this | |
420 | mode.</entry> | |
421 | </row> | |
422 | <row> | |
423 | <entry><constant>V4L2_TUNER_MODE_SAP</constant></entry> | |
424 | <entry>2</entry> | |
425 | <entry>Play the Second Audio Program. When the tuner | |
426 | receives no bilingual audio or SAP, or their reception is not | |
427 | supported the driver shall fall back to mono or stereo mode. Only | |
428 | <constant>V4L2_TUNER_ANALOG_TV</constant> tuners support this mode. | |
429 | Note the <constant>V4L2_TUNER_MODE_LANG2</constant> and | |
430 | <constant>V4L2_TUNER_MODE_SAP</constant> are synonyms.</entry> | |
431 | </row> | |
432 | <row> | |
433 | <entry><constant>V4L2_TUNER_MODE_LANG1_LANG2</constant></entry> | |
434 | <entry>4</entry> | |
435 | <entry>Play the primary language on the left channel, the | |
436 | secondary language on the right channel. When the tuner receives no | |
437 | bilingual audio or SAP, it shall fall back to | |
438 | <constant>MODE_LANG1</constant> or <constant>MODE_MONO</constant>. | |
439 | Only <constant>V4L2_TUNER_ANALOG_TV</constant> tuners support this | |
440 | mode.</entry> | |
441 | </row> | |
442 | </tbody> | |
443 | </tgroup> | |
444 | </table> | |
445 | ||
446 | <table pgwide="1" frame="all" id="tuner-matrix"> | |
447 | <title>Tuner Audio Matrix</title> | |
448 | <tgroup cols="6" align="center"> | |
449 | <colspec align="left" /> | |
450 | <colspec colname="c2" colwidth="1*" /> | |
451 | <colspec colwidth="1*" /> | |
452 | <colspec colwidth="1*" /> | |
453 | <colspec colnum="6" colname="c6" colwidth="1*" /> | |
454 | <spanspec namest="c2" nameend="c6" spanname="hspan" align="center" /> | |
455 | <thead> | |
456 | <row> | |
457 | <entry></entry> | |
458 | <entry spanname="hspan">Selected | |
459 | <constant>V4L2_TUNER_MODE_</constant></entry> | |
460 | </row> | |
461 | <row> | |
462 | <entry>Received <constant>V4L2_TUNER_SUB_</constant></entry> | |
463 | <entry><constant>MONO</constant></entry> | |
464 | <entry><constant>STEREO</constant></entry> | |
465 | <entry><constant>LANG1</constant></entry> | |
466 | <entry><constant>LANG2 = SAP</constant></entry> | |
467 | <entry><constant>LANG1_LANG2</constant><footnote><para>This | |
468 | mode has been added in Linux 2.6.17 and may not be supported by older | |
469 | drivers.</para></footnote></entry> | |
470 | </row> | |
471 | </thead> | |
472 | <tbody valign="top"> | |
473 | <row> | |
474 | <entry><constant>MONO</constant></entry> | |
475 | <entry>Mono</entry> | |
476 | <entry>Mono/Mono</entry> | |
477 | <entry>Mono</entry> | |
478 | <entry>Mono</entry> | |
479 | <entry>Mono/Mono</entry> | |
480 | </row> | |
481 | <row> | |
482 | <entry><constant>MONO | SAP</constant></entry> | |
483 | <entry>Mono</entry> | |
484 | <entry>Mono/Mono</entry> | |
485 | <entry>Mono</entry> | |
486 | <entry>SAP</entry> | |
487 | <entry>Mono/SAP (preferred) or Mono/Mono</entry> | |
488 | </row> | |
489 | <row> | |
490 | <entry><constant>STEREO</constant></entry> | |
491 | <entry>L+R</entry> | |
492 | <entry>L/R</entry> | |
493 | <entry>Stereo L/R (preferred) or Mono L+R</entry> | |
494 | <entry>Stereo L/R (preferred) or Mono L+R</entry> | |
495 | <entry>L/R (preferred) or L+R/L+R</entry> | |
496 | </row> | |
497 | <row> | |
498 | <entry><constant>STEREO | SAP</constant></entry> | |
499 | <entry>L+R</entry> | |
500 | <entry>L/R</entry> | |
501 | <entry>Stereo L/R (preferred) or Mono L+R</entry> | |
502 | <entry>SAP</entry> | |
503 | <entry>L+R/SAP (preferred) or L/R or L+R/L+R</entry> | |
504 | </row> | |
505 | <row> | |
506 | <entry><constant>LANG1 | LANG2</constant></entry> | |
507 | <entry>Language 1</entry> | |
508 | <entry>Lang1/Lang2 (deprecated<footnote><para>Playback of | |
509 | both languages in <constant>MODE_STEREO</constant> is deprecated. In | |
510 | the future drivers should produce only the primary language in this | |
511 | mode. Applications should request | |
512 | <constant>MODE_LANG1_LANG2</constant> to record both languages or a | |
513 | stereo signal.</para></footnote>) or | |
514 | Lang1/Lang1</entry> | |
515 | <entry>Language 1</entry> | |
516 | <entry>Language 2</entry> | |
517 | <entry>Lang1/Lang2 (preferred) or Lang1/Lang1</entry> | |
518 | </row> | |
519 | </tbody> | |
520 | </tgroup> | |
521 | </table> | |
522 | </refsect1> | |
523 | ||
524 | <refsect1> | |
525 | &return-value; | |
526 | ||
527 | <variablelist> | |
528 | <varlistentry> | |
529 | <term><errorcode>EINVAL</errorcode></term> | |
530 | <listitem> | |
531 | <para>The &v4l2-tuner; <structfield>index</structfield> is | |
532 | out of bounds.</para> | |
533 | </listitem> | |
534 | </varlistentry> | |
535 | </variablelist> | |
536 | </refsect1> | |
537 | </refentry> |