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1<title>DVB Audio Device</title>
2<para>The DVB audio device controls the MPEG2 audio decoder of the DVB hardware. It
3can be accessed through <emphasis role="tt">/dev/dvb/adapter0/audio0</emphasis>. Data types and and
4ioctl definitions can be accessed by including <emphasis role="tt">linux/dvb/video.h</emphasis> in your
5application.
6</para>
7<para>Please note that some DVB cards don&#8217;t have their own MPEG decoder, which results in
8the omission of the audio and video device.
9</para>
10
11<section id="audio_data_types">
12<title>Audio Data Types</title>
13<para>This section describes the structures, data types and defines used when talking to the
14audio device.
15</para>
16
17<section id="audio_stream_source_t">
18<title>audio_stream_source_t</title>
19<para>The audio stream source is set through the AUDIO_SELECT_SOURCE call and can take
20the following values, depending on whether we are replaying from an internal (demux) or
21external (user write) source.
22</para>
23<programlisting>
24 typedef enum {
25 AUDIO_SOURCE_DEMUX,
26 AUDIO_SOURCE_MEMORY
27 } audio_stream_source_t;
28</programlisting>
29<para>AUDIO_SOURCE_DEMUX selects the demultiplexer (fed either by the frontend or the
30DVR device) as the source of the video stream. If AUDIO_SOURCE_MEMORY
31is selected the stream comes from the application through the <emphasis role="tt">write()</emphasis> system
32call.
33</para>
34
35</section>
36<section id="audio_play_state_t">
37<title>audio_play_state_t</title>
38<para>The following values can be returned by the AUDIO_GET_STATUS call representing the
39state of audio playback.
40</para>
41<programlisting>
42 typedef enum {
43 AUDIO_STOPPED,
44 AUDIO_PLAYING,
45 AUDIO_PAUSED
46 } audio_play_state_t;
47</programlisting>
48
49</section>
50<section id="audio_channel_select_t">
51<title>audio_channel_select_t</title>
52<para>The audio channel selected via AUDIO_CHANNEL_SELECT is determined by the
53following values.
54</para>
55<programlisting>
56 typedef enum {
57 AUDIO_STEREO,
58 AUDIO_MONO_LEFT,
59 AUDIO_MONO_RIGHT,
60 } audio_channel_select_t;
61</programlisting>
62
63</section>
64<section id="struct_audio_status">
65<title>struct audio_status</title>
66<para>The AUDIO_GET_STATUS call returns the following structure informing about various
67states of the playback operation.
68</para>
69<programlisting>
70 typedef struct audio_status {
71 boolean AV_sync_state;
72 boolean mute_state;
73 audio_play_state_t play_state;
74 audio_stream_source_t stream_source;
75 audio_channel_select_t channel_select;
76 boolean bypass_mode;
77 } audio_status_t;
78</programlisting>
79
80</section>
81<section id="struct_audio_mixer">
82<title>struct audio_mixer</title>
83<para>The following structure is used by the AUDIO_SET_MIXER call to set the audio
84volume.
85</para>
86<programlisting>
87 typedef struct audio_mixer {
88 unsigned int volume_left;
89 unsigned int volume_right;
90 } audio_mixer_t;
91</programlisting>
92
93</section>
94<section id="audio_encodings">
95<title>audio encodings</title>
96<para>A call to AUDIO_GET_CAPABILITIES returns an unsigned integer with the following
97bits set according to the hardwares capabilities.
98</para>
99<programlisting>
100 #define AUDIO_CAP_DTS 1
101 #define AUDIO_CAP_LPCM 2
102 #define AUDIO_CAP_MP1 4
103 #define AUDIO_CAP_MP2 8
104 #define AUDIO_CAP_MP3 16
105 #define AUDIO_CAP_AAC 32
106 #define AUDIO_CAP_OGG 64
107 #define AUDIO_CAP_SDDS 128
108 #define AUDIO_CAP_AC3 256
109</programlisting>
110
111</section>
112<section id="struct_audio_karaoke">
113<title>struct audio_karaoke</title>
114<para>The ioctl AUDIO_SET_KARAOKE uses the following format:
115</para>
116<programlisting>
117 typedef
118 struct audio_karaoke{
119 int vocal1;
120 int vocal2;
121 int melody;
122 } audio_karaoke_t;
123</programlisting>
124<para>If Vocal1 or Vocal2 are non-zero, they get mixed into left and right t at 70% each. If both,
125Vocal1 and Vocal2 are non-zero, Vocal1 gets mixed into the left channel and Vocal2 into the
126right channel at 100% each. Ff Melody is non-zero, the melody channel gets mixed into left
127and right.
128</para>
129
130</section>
131<section id="audio_attributes">
132<title>audio attributes</title>
133<para>The following attributes can be set by a call to AUDIO_SET_ATTRIBUTES:
134</para>
135<programlisting>
136 typedef uint16_t audio_attributes_t;
137 /&#x22C6; bits: descr. &#x22C6;/
138 /&#x22C6; 15-13 audio coding mode (0=ac3, 2=mpeg1, 3=mpeg2ext, 4=LPCM, 6=DTS, &#x22C6;/
139 /&#x22C6; 12 multichannel extension &#x22C6;/
140 /&#x22C6; 11-10 audio type (0=not spec, 1=language included) &#x22C6;/
141 /&#x22C6; 9- 8 audio application mode (0=not spec, 1=karaoke, 2=surround) &#x22C6;/
142 /&#x22C6; 7- 6 Quantization / DRC (mpeg audio: 1=DRC exists)(lpcm: 0=16bit, &#x22C6;/
143 /&#x22C6; 5- 4 Sample frequency fs (0=48kHz, 1=96kHz) &#x22C6;/
144 /&#x22C6; 2- 0 number of audio channels (n+1 channels) &#x22C6;/
145</programlisting>
146 </section></section>
147<section id="audio_function_calls">
148<title>Audio Function Calls</title>
149
150
151<section id="audio_fopen">
152<title>open()</title>
153<para>DESCRIPTION
154</para>
155<informaltable><tgroup cols="1"><tbody><row><entry
156 align="char">
157<para>This system call opens a named audio device (e.g. /dev/dvb/adapter0/audio0)
158 for subsequent use. When an open() call has succeeded, the device will be ready
159 for use. The significance of blocking or non-blocking mode is described in the
160 documentation for functions where there is a difference. It does not affect the
161 semantics of the open() call itself. A device opened in blocking mode can later
162 be put into non-blocking mode (and vice versa) using the F_SETFL command
163 of the fcntl system call. This is a standard system call, documented in the Linux
164 manual page for fcntl. Only one user can open the Audio Device in O_RDWR
165 mode. All other attempts to open the device in this mode will fail, and an error
166 code will be returned. If the Audio Device is opened in O_RDONLY mode, the
167 only ioctl call that can be used is AUDIO_GET_STATUS. All other call will
168 return with an error code.</para>
169</entry>
170 </row></tbody></tgroup></informaltable>
171<para>SYNOPSIS
172</para>
173<informaltable><tgroup cols="1"><tbody><row><entry
174 align="char">
175<para>int open(const char &#x22C6;deviceName, int flags);</para>
176</entry>
177 </row></tbody></tgroup></informaltable>
178<para>PARAMETERS
179</para>
180<informaltable><tgroup cols="2"><tbody><row><entry
181 align="char">
182<para>const char
183 *deviceName</para>
184</entry><entry
185 align="char">
186<para>Name of specific audio device.</para>
187</entry>
188 </row><row><entry
189 align="char">
190<para>int flags</para>
191</entry><entry
192 align="char">
193<para>A bit-wise OR of the following flags:</para>
194</entry>
195 </row><row><entry
196 align="char">
197</entry><entry
198 align="char">
199<para>O_RDONLY read-only access</para>
200</entry>
201 </row><row><entry
202 align="char">
203</entry><entry
204 align="char">
205<para>O_RDWR read/write access</para>
206</entry>
207 </row><row><entry
208 align="char">
209</entry><entry
210 align="char">
211<para>O_NONBLOCK open in non-blocking mode</para>
212</entry>
213 </row><row><entry
214 align="char">
215</entry><entry
216 align="char">
217<para>(blocking mode is the default)</para>
218</entry>
219 </row></tbody></tgroup></informaltable>
220<para>ERRORS
221</para>
222<informaltable><tgroup cols="2"><tbody><row><entry
223 align="char">
224<para>ENODEV</para>
225</entry><entry
226 align="char">
227<para>Device driver not loaded/available.</para>
228</entry>
229 </row><row><entry
230 align="char">
231<para>EINTERNAL</para>
232</entry><entry
233 align="char">
234<para>Internal error.</para>
235</entry>
236 </row><row><entry
237 align="char">
238<para>EBUSY</para>
239</entry><entry
240 align="char">
241<para>Device or resource busy.</para>
242</entry>
243 </row><row><entry
244 align="char">
245<para>EINVAL</para>
246</entry><entry
247 align="char">
248<para>Invalid argument.</para>
249</entry>
250 </row></tbody></tgroup></informaltable>
251
252</section>
253<section id="audio_fclose">
254<title>close()</title>
255<para>DESCRIPTION
256</para>
257<informaltable><tgroup cols="1"><tbody><row><entry
258 align="char">
259<para>This system call closes a previously opened audio device.</para>
260</entry>
261 </row></tbody></tgroup></informaltable>
262<para>SYNOPSIS
263</para>
264<informaltable><tgroup cols="1"><tbody><row><entry
265 align="char">
266<para>int close(int fd);</para>
267</entry>
268 </row></tbody></tgroup></informaltable>
269<para>PARAMETERS
270</para>
271<informaltable><tgroup cols="2"><tbody><row><entry
272 align="char">
273<para>int fd</para>
274</entry><entry
275 align="char">
276<para>File descriptor returned by a previous call to open().</para>
277</entry>
278 </row></tbody></tgroup></informaltable>
279<para>ERRORS
280</para>
281<informaltable><tgroup cols="2"><tbody><row><entry
282 align="char">
283<para>EBADF</para>
284</entry><entry
285 align="char">
286<para>fd is not a valid open file descriptor.</para>
287</entry>
288 </row></tbody></tgroup></informaltable>
289
290</section>
291<section id="audio_fwrite">
292<title>write()</title>
293<para>DESCRIPTION
294</para>
295<informaltable><tgroup cols="1"><tbody><row><entry
296 align="char">
297<para>This system call can only be used if AUDIO_SOURCE_MEMORY is selected
298 in the ioctl call AUDIO_SELECT_SOURCE. The data provided shall be in
299 PES format. If O_NONBLOCK is not specified the function will block until
300 buffer space is available. The amount of data to be transferred is implied by
301 count.</para>
302</entry>
303 </row></tbody></tgroup></informaltable>
304<para>SYNOPSIS
305</para>
306<informaltable><tgroup cols="1"><tbody><row><entry
307 align="char">
308<para>size_t write(int fd, const void &#x22C6;buf, size_t count);</para>
309</entry>
310 </row></tbody></tgroup></informaltable>
311<para>PARAMETERS
312</para>
313<informaltable><tgroup cols="2"><tbody><row><entry
314 align="char">
315<para>int fd</para>
316</entry><entry
317 align="char">
318<para>File descriptor returned by a previous call to open().</para>
319</entry>
320 </row><row><entry
321 align="char">
322<para>void *buf</para>
323</entry><entry
324 align="char">
325<para>Pointer to the buffer containing the PES data.</para>
326</entry>
327 </row><row><entry
328 align="char">
329<para>size_t count</para>
330</entry><entry
331 align="char">
332<para>Size of buf.</para>
333</entry>
334 </row></tbody></tgroup></informaltable>
335<para>ERRORS
336</para>
337<informaltable><tgroup cols="2"><tbody><row><entry
338 align="char">
339<para>EPERM</para>
340</entry><entry
341 align="char">
342<para>Mode AUDIO_SOURCE_MEMORY not selected.</para>
343</entry>
344 </row><row><entry
345 align="char">
346<para>ENOMEM</para>
347</entry><entry
348 align="char">
349<para>Attempted to write more data than the internal buffer can
350 hold.</para>
351</entry>
352 </row><row><entry
353 align="char">
354<para>EBADF</para>
355</entry><entry
356 align="char">
357<para>fd is not a valid open file descriptor.</para>
358</entry>
359 </row></tbody></tgroup></informaltable>
360
361</section><section
362role="subsection"><title>AUDIO_STOP</title>
363<para>DESCRIPTION
364</para>
365<informaltable><tgroup cols="1"><tbody><row><entry
366 align="char">
367<para>This ioctl call asks the Audio Device to stop playing the current stream.</para>
368</entry>
369 </row></tbody></tgroup></informaltable>
370<para>SYNOPSIS
371</para>
372<informaltable><tgroup cols="1"><tbody><row><entry
373 align="char">
374<para>int ioctl(int fd, int request = AUDIO_STOP);</para>
375</entry>
376 </row></tbody></tgroup></informaltable>
377<para>PARAMETERS
378</para>
379<informaltable><tgroup cols="2"><tbody><row><entry
380 align="char">
381<para>int fd</para>
382</entry><entry
383 align="char">
384<para>File descriptor returned by a previous call to open().</para>
385</entry>
386 </row><row><entry
387 align="char">
388<para>int request</para>
389</entry><entry
390 align="char">
391<para>Equals AUDIO_STOP for this command.</para>
392</entry>
393 </row></tbody></tgroup></informaltable>
394<para>ERRORS
395</para>
396<informaltable><tgroup cols="2"><tbody><row><entry
397 align="char">
398<para>EBADF</para>
399</entry><entry
400 align="char">
401<para>fd is not a valid open file descriptor</para>
402</entry>
403 </row><row><entry
404 align="char">
405<para>EINTERNAL</para>
406</entry><entry
407 align="char">
408<para>Internal error.</para>
409</entry>
410 </row></tbody></tgroup></informaltable>
411
412</section><section
413role="subsection"><title>AUDIO_PLAY</title>
414<para>DESCRIPTION
415</para>
416<informaltable><tgroup cols="1"><tbody><row><entry
417 align="char">
418<para>This ioctl call asks the Audio Device to start playing an audio stream from the
419 selected source.</para>
420</entry>
421 </row></tbody></tgroup></informaltable>
422<para>SYNOPSIS
423</para>
424<informaltable><tgroup cols="1"><tbody><row><entry
425 align="char">
426<para>int ioctl(int fd, int request = AUDIO_PLAY);</para>
427</entry>
428 </row></tbody></tgroup></informaltable>
429<para>PARAMETERS
430</para>
431<informaltable><tgroup cols="2"><tbody><row><entry
432 align="char">
433<para>int fd</para>
434</entry><entry
435 align="char">
436<para>File descriptor returned by a previous call to open().</para>
437</entry>
438 </row><row><entry
439 align="char">
440<para>int request</para>
441</entry><entry
442 align="char">
443<para>Equals AUDIO_PLAY for this command.</para>
444</entry>
445 </row></tbody></tgroup></informaltable>
446<para>ERRORS
447</para>
448<informaltable><tgroup cols="2"><tbody><row><entry
449 align="char">
450<para>EBADF</para>
451</entry><entry
452 align="char">
453<para>fd is not a valid open file descriptor</para>
454</entry>
455 </row><row><entry
456 align="char">
457<para>EINTERNAL</para>
458</entry><entry
459 align="char">
460<para>Internal error.</para>
461</entry>
462 </row></tbody></tgroup></informaltable>
463
464</section><section
465role="subsection"><title>AUDIO_PAUSE</title>
466<para>DESCRIPTION
467</para>
468<informaltable><tgroup cols="1"><tbody><row><entry
469 align="char">
470<para>This ioctl call suspends the audio stream being played. Decoding and playing
471 are paused. It is then possible to restart again decoding and playing process of
472 the audio stream using AUDIO_CONTINUE command.</para>
473</entry>
474 </row><row><entry
475 align="char">
476<para>If AUDIO_SOURCE_MEMORY is selected in the ioctl call
477 AUDIO_SELECT_SOURCE, the DVB-subsystem will not decode (consume)
478 any more data until the ioctl call AUDIO_CONTINUE or AUDIO_PLAY is
479 performed.</para>
480</entry>
481 </row></tbody></tgroup></informaltable>
482<para>SYNOPSIS
483</para>
484<informaltable><tgroup cols="1"><tbody><row><entry
485 align="char">
486<para>int ioctl(int fd, int request = AUDIO_PAUSE);</para>
487</entry>
488 </row></tbody></tgroup></informaltable>
489<para>PARAMETERS
490</para>
491<informaltable><tgroup cols="2"><tbody><row><entry
492 align="char">
493<para>int fd</para>
494</entry><entry
495 align="char">
496<para>File descriptor returned by a previous call to open().</para>
497</entry>
498 </row><row><entry
499 align="char">
500<para>int request</para>
501</entry><entry
502 align="char">
503<para>Equals AUDIO_PAUSE for this command.</para>
504</entry>
505 </row></tbody></tgroup></informaltable>
506<para>ERRORS
507</para>
508<informaltable><tgroup cols="2"><tbody><row><entry
509 align="char">
510<para>EBADF</para>
511</entry><entry
512 align="char">
513<para>fd is not a valid open file descriptor.</para>
514</entry>
515 </row><row><entry
516 align="char">
517<para>EINTERNAL</para>
518</entry><entry
519 align="char">
520<para>Internal error.</para>
521</entry>
522 </row></tbody></tgroup></informaltable>
523
524</section><section
525role="subsection"><title>AUDIO_SELECT_SOURCE</title>
526<para>DESCRIPTION
527</para>
528<informaltable><tgroup cols="1"><tbody><row><entry
529 align="char">
530<para>This ioctl call informs the audio device which source shall be used
531 for the input data. The possible sources are demux or memory. If
532 AUDIO_SOURCE_MEMORY is selected, the data is fed to the Audio Device
533 through the write command.</para>
534</entry>
535 </row></tbody></tgroup></informaltable>
536<para>SYNOPSIS
537</para>
538<informaltable><tgroup cols="1"><tbody><row><entry
539 align="char">
540<para>int ioctl(int fd, int request = AUDIO_SELECT_SOURCE,
541 audio_stream_source_t source);</para>
542</entry>
543 </row></tbody></tgroup></informaltable>
544<para>PARAMETERS
545</para>
546<informaltable><tgroup cols="2"><tbody><row><entry
547 align="char">
548<para>int fd</para>
549</entry><entry
550 align="char">
551<para>File descriptor returned by a previous call to open().</para>
552</entry>
553 </row><row><entry
554 align="char">
555<para>int request</para>
556</entry><entry
557 align="char">
558<para>Equals AUDIO_SELECT_SOURCE for this command.</para>
559</entry>
560 </row><row><entry
561 align="char">
562<para>audio_stream_source_t
563 source</para>
564</entry><entry
565 align="char">
566<para>Indicates the source that shall be used for the Audio
567 stream.</para>
568</entry>
569 </row></tbody></tgroup></informaltable>
570<para>ERRORS
571</para>
572<informaltable><tgroup cols="2"><tbody><row><entry
573 align="char">
574<para>EBADF</para>
575</entry><entry
576 align="char">
577<para>fd is not a valid open file descriptor.</para>
578</entry>
579 </row><row><entry
580 align="char">
581<para>EINTERNAL</para>
582</entry><entry
583 align="char">
584<para>Internal error.</para>
585</entry>
586 </row><row><entry
587 align="char">
588<para>EINVAL</para>
589</entry><entry
590 align="char">
591<para>Illegal input parameter.</para>
592</entry>
593 </row></tbody></tgroup></informaltable>
594
595</section><section
596role="subsection"><title>AUDIO_SET_MUTE</title>
597<para>DESCRIPTION
598</para>
599<informaltable><tgroup cols="1"><tbody><row><entry
600 align="char">
601<para>This ioctl call asks the audio device to mute the stream that is currently being
602 played.</para>
603</entry>
604 </row></tbody></tgroup></informaltable>
605<para>SYNOPSIS
606</para>
607<informaltable><tgroup cols="1"><tbody><row><entry
608 align="char">
609<para>int ioctl(int fd, int request = AUDIO_SET_MUTE,
610 boolean state);</para>
611</entry>
612 </row></tbody></tgroup></informaltable>
613<para>PARAMETERS
614</para>
615<informaltable><tgroup cols="2"><tbody><row><entry
616 align="char">
617<para>int fd</para>
618</entry><entry
619 align="char">
620<para>File descriptor returned by a previous call to open().</para>
621</entry>
622 </row><row><entry
623 align="char">
624<para>int request</para>
625</entry><entry
626 align="char">
627<para>Equals AUDIO_SET_MUTE for this command.</para>
628</entry>
629 </row><row><entry
630 align="char">
631<para>boolean state</para>
632</entry><entry
633 align="char">
634<para>Indicates if audio device shall mute or not.</para>
635</entry>
636 </row><row><entry
637 align="char">
638</entry><entry
639 align="char">
640<para>TRUE Audio Mute</para>
641</entry>
642 </row><row><entry
643 align="char">
644</entry><entry
645 align="char">
646<para>FALSE Audio Un-mute</para>
647</entry>
648 </row></tbody></tgroup></informaltable>
649<para>ERRORS
650</para>
651<informaltable><tgroup cols="2"><tbody><row><entry
652 align="char">
653<para>EBADF</para>
654</entry><entry
655 align="char">
656<para>fd is not a valid open file descriptor.</para>
657</entry>
658 </row><row><entry
659 align="char">
660<para>EINTERNAL</para>
661</entry><entry
662 align="char">
663<para>Internal error.</para>
664</entry>
665 </row><row><entry
666 align="char">
667<para>EINVAL</para>
668</entry><entry
669 align="char">
670<para>Illegal input parameter.</para>
671</entry>
672 </row></tbody></tgroup></informaltable>
673
674</section><section
675role="subsection"><title>AUDIO_SET_AV_SYNC</title>
676<para>DESCRIPTION
677</para>
678<informaltable><tgroup cols="1"><tbody><row><entry
679 align="char">
680<para>This ioctl call asks the Audio Device to turn ON or OFF A/V synchronization.</para>
681</entry>
682 </row></tbody></tgroup></informaltable>
683<para>SYNOPSIS
684</para>
685<informaltable><tgroup cols="1"><tbody><row><entry
686 align="char">
687<para>int ioctl(int fd, int request = AUDIO_SET_AV_SYNC,
688 boolean state);</para>
689</entry>
690 </row></tbody></tgroup></informaltable>
691<para>PARAMETERS
692</para>
693<informaltable><tgroup cols="2"><tbody><row><entry
694 align="char">
695<para>int fd</para>
696</entry><entry
697 align="char">
698<para>File descriptor returned by a previous call to open().</para>
699</entry>
700 </row><row><entry
701 align="char">
702<para>int request</para>
703</entry><entry
704 align="char">
705<para>Equals AUDIO_AV_SYNC for this command.</para>
706</entry>
707 </row><row><entry
708 align="char">
709<para>boolean state</para>
710</entry><entry
711 align="char">
712<para>Tells the DVB subsystem if A/V synchronization shall be
713 ON or OFF.</para>
714</entry>
715 </row><row><entry
716 align="char">
717</entry><entry
718 align="char">
719<para>TRUE AV-sync ON</para>
720</entry>
721 </row><row><entry
722 align="char">
723</entry><entry
724 align="char">
725<para>FALSE AV-sync OFF</para>
726</entry>
727 </row></tbody></tgroup></informaltable>
728<para>ERRORS
729</para>
730<informaltable><tgroup cols="2"><tbody><row><entry
731 align="char">
732<para>EBADF</para>
733</entry><entry
734 align="char">
735<para>fd is not a valid open file descriptor.</para>
736</entry>
737 </row><row><entry
738 align="char">
739<para>EINTERNAL</para>
740</entry><entry
741 align="char">
742<para>Internal error.</para>
743</entry>
744 </row><row><entry
745 align="char">
746<para>EINVAL</para>
747</entry><entry
748 align="char">
749<para>Illegal input parameter.</para>
750</entry>
751 </row></tbody></tgroup></informaltable>
752
753</section><section
754role="subsection"><title>AUDIO_SET_BYPASS_MODE</title>
755<para>DESCRIPTION
756</para>
757<informaltable><tgroup cols="1"><tbody><row><entry
758 align="char">
759<para>This ioctl call asks the Audio Device to bypass the Audio decoder and forward
760 the stream without decoding. This mode shall be used if streams that can&#8217;t be
761 handled by the DVB system shall be decoded. Dolby DigitalTM streams are
762 automatically forwarded by the DVB subsystem if the hardware can handle it.</para>
763</entry>
764 </row></tbody></tgroup></informaltable>
765<para>SYNOPSIS
766</para>
767<informaltable><tgroup cols="1"><tbody><row><entry
768 align="char">
769<para>int ioctl(int fd, int request =
770 AUDIO_SET_BYPASS_MODE, boolean mode);</para>
771</entry>
772 </row></tbody></tgroup></informaltable>
773<para>PARAMETERS
774</para>
775<informaltable><tgroup cols="2"><tbody><row><entry
776 align="char">
777<para>int fd</para>
778</entry><entry
779 align="char">
780<para>File descriptor returned by a previous call to open().</para>
781</entry>
782 </row><row><entry
783 align="char">
784<para>int request</para>
785</entry><entry
786 align="char">
787<para>Equals AUDIO_SET_BYPASS_MODE for this
788 command.</para>
789</entry>
790 </row><row><entry
791 align="char">
792<para>boolean mode</para>
793</entry><entry
794 align="char">
795<para>Enables or disables the decoding of the current Audio
796 stream in the DVB subsystem.</para>
797</entry>
798 </row><row><entry
799 align="char">
800</entry><entry
801 align="char">
802<para>TRUE Bypass is disabled</para>
803</entry>
804 </row><row><entry
805 align="char">
806</entry><entry
807 align="char">
808<para>FALSE Bypass is enabled</para>
809</entry>
810 </row></tbody></tgroup></informaltable>
811<para>ERRORS
812</para>
813<informaltable><tgroup cols="2"><tbody><row><entry
814 align="char">
815<para>EBADF</para>
816</entry><entry
817 align="char">
818<para>fd is not a valid open file descriptor.</para>
819</entry>
820 </row><row><entry
821 align="char">
822<para>EINTERNAL</para>
823</entry><entry
824 align="char">
825<para>Internal error.</para>
826</entry>
827 </row><row><entry
828 align="char">
829<para>EINVAL</para>
830</entry><entry
831 align="char">
832<para>Illegal input parameter.</para>
833</entry>
834 </row></tbody></tgroup></informaltable>
835
836</section><section
837role="subsection"><title>AUDIO_CHANNEL_SELECT</title>
838<para>DESCRIPTION
839</para>
840<informaltable><tgroup cols="1"><tbody><row><entry
841 align="char">
842<para>This ioctl call asks the Audio Device to select the requested channel if possible.</para>
843</entry>
844 </row></tbody></tgroup></informaltable>
845<para>SYNOPSIS
846</para>
847<informaltable><tgroup cols="1"><tbody><row><entry
848 align="char">
849<para>int ioctl(int fd, int request =
850 AUDIO_CHANNEL_SELECT, audio_channel_select_t);</para>
851</entry>
852 </row></tbody></tgroup></informaltable>
853<para>PARAMETERS
854</para>
855<informaltable><tgroup cols="2"><tbody><row><entry
856 align="char">
857<para>int fd</para>
858</entry><entry
859 align="char">
860<para>File descriptor returned by a previous call to open().</para>
861</entry>
862 </row><row><entry
863 align="char">
864<para>int request</para>
865</entry><entry
866 align="char">
867<para>Equals AUDIO_CHANNEL_SELECT for this
868 command.</para>
869</entry>
870 </row><row><entry
871 align="char">
872<para>audio_channel_select_t
873 ch</para>
874</entry><entry
875 align="char">
876<para>Select the output format of the audio (mono left/right,
877 stereo).</para>
878</entry>
879 </row></tbody></tgroup></informaltable>
880<para>ERRORS
881</para>
882<informaltable><tgroup cols="2"><tbody><row><entry
883 align="char">
884<para>EBADF</para>
885</entry><entry
886 align="char">
887<para>fd is not a valid open file descriptor.</para>
888</entry>
889 </row><row><entry
890 align="char">
891<para>EINTERNAL</para>
892</entry><entry
893 align="char">
894<para>Internal error.</para>
895</entry>
896 </row><row><entry
897 align="char">
898<para>EINVAL</para>
899</entry><entry
900 align="char">
901<para>Illegal input parameter ch.</para>
902</entry>
903 </row></tbody></tgroup></informaltable>
904
905</section><section
906role="subsection"><title>AUDIO_GET_STATUS</title>
907<para>DESCRIPTION
908</para>
909<informaltable><tgroup cols="1"><tbody><row><entry
910 align="char">
911<para>This ioctl call asks the Audio Device to return the current state of the Audio
912 Device.</para>
913</entry>
914 </row></tbody></tgroup></informaltable>
915<para>SYNOPSIS
916</para>
917<informaltable><tgroup cols="1"><tbody><row><entry
918 align="char">
919<para>int ioctl(int fd, int request = AUDIO_GET_STATUS,
920 struct audio_status &#x22C6;status);</para>
921</entry>
922 </row></tbody></tgroup></informaltable>
923<para>PARAMETERS
924</para>
925<informaltable><tgroup cols="2"><tbody><row><entry
926 align="char">
927<para>int fd</para>
928</entry><entry
929 align="char">
930<para>File descriptor returned by a previous call to open().</para>
931</entry>
932 </row><row><entry
933 align="char">
934<para>int request</para>
935</entry><entry
936 align="char">
937<para>Equals AUDIO_GET_STATUS for this command.</para>
938</entry>
939 </row><row><entry
940 align="char">
941<para>struct audio_status
942 *status</para>
943</entry><entry
944 align="char">
945<para>Returns the current state of Audio Device.</para>
946</entry>
947 </row></tbody></tgroup></informaltable>
948<para>ERRORS
949</para>
950<informaltable><tgroup cols="2"><tbody><row><entry
951 align="char">
952<para>EBADF</para>
953</entry><entry
954 align="char">
955<para>fd is not a valid open file descriptor.</para>
956</entry>
957 </row><row><entry
958 align="char">
959<para>EINTERNAL</para>
960</entry><entry
961 align="char">
962<para>Internal error.</para>
963</entry>
964 </row><row><entry
965 align="char">
966<para>EFAULT</para>
967</entry><entry
968 align="char">
969<para>status points to invalid address.</para>
970</entry>
971 </row></tbody></tgroup></informaltable>
972
973</section><section
974role="subsection"><title>AUDIO_GET_CAPABILITIES</title>
975<para>DESCRIPTION
976</para>
977<informaltable><tgroup cols="1"><tbody><row><entry
978 align="char">
979<para>This ioctl call asks the Audio Device to tell us about the decoding capabilities
980 of the audio hardware.</para>
981</entry>
982 </row></tbody></tgroup></informaltable>
983<para>SYNOPSIS
984</para>
985<informaltable><tgroup cols="1"><tbody><row><entry
986 align="char">
987<para>int ioctl(int fd, int request =
988 AUDIO_GET_CAPABILITIES, unsigned int &#x22C6;cap);</para>
989</entry>
990 </row></tbody></tgroup></informaltable>
991<para>PARAMETERS
992</para>
993<informaltable><tgroup cols="2"><tbody><row><entry
994 align="char">
995<para>int fd</para>
996</entry><entry
997 align="char">
998<para>File descriptor returned by a previous call to open().</para>
999</entry>
1000 </row><row><entry
1001 align="char">
1002<para>int request</para>
1003</entry><entry
1004 align="char">
1005<para>Equals AUDIO_GET_CAPABILITIES for this
1006 command.</para>
1007</entry>
1008 </row><row><entry
1009 align="char">
1010<para>unsigned int *cap</para>
1011</entry><entry
1012 align="char">
1013<para>Returns a bit array of supported sound formats.</para>
1014</entry>
1015 </row></tbody></tgroup></informaltable>
1016<para>ERRORS
1017</para>
1018<informaltable><tgroup cols="2"><tbody><row><entry
1019 align="char">
1020<para>EBADF</para>
1021</entry><entry
1022 align="char">
1023<para>fd is not a valid open file descriptor.</para>
1024</entry>
1025 </row><row><entry
1026 align="char">
1027<para>EINTERNAL</para>
1028</entry><entry
1029 align="char">
1030<para>Internal error.</para>
1031</entry>
1032 </row><row><entry
1033 align="char">
1034<para>EFAULT</para>
1035</entry><entry
1036 align="char">
1037<para>cap points to an invalid address.</para>
1038</entry>
1039 </row></tbody></tgroup></informaltable>
1040
1041</section><section
1042role="subsection"><title>AUDIO_CLEAR_BUFFER</title>
1043<para>DESCRIPTION
1044</para>
1045<informaltable><tgroup cols="1"><tbody><row><entry
1046 align="char">
1047<para>This ioctl call asks the Audio Device to clear all software and hardware buffers
1048 of the audio decoder device.</para>
1049</entry>
1050 </row></tbody></tgroup></informaltable>
1051<para>SYNOPSIS
1052</para>
1053<informaltable><tgroup cols="1"><tbody><row><entry
1054 align="char">
1055<para>int ioctl(int fd, int request = AUDIO_CLEAR_BUFFER);</para>
1056</entry>
1057 </row></tbody></tgroup></informaltable>
1058<para>PARAMETERS
1059</para>
1060<informaltable><tgroup cols="2"><tbody><row><entry
1061 align="char">
1062<para>int fd</para>
1063</entry><entry
1064 align="char">
1065<para>File descriptor returned by a previous call to open().</para>
1066</entry>
1067 </row><row><entry
1068 align="char">
1069<para>int request</para>
1070</entry><entry
1071 align="char">
1072<para>Equals AUDIO_CLEAR_BUFFER for this command.</para>
1073</entry>
1074 </row></tbody></tgroup></informaltable>
1075<para>ERRORS
1076</para>
1077<informaltable><tgroup cols="2"><tbody><row><entry
1078 align="char">
1079<para>EBADF</para>
1080</entry><entry
1081 align="char">
1082<para>fd is not a valid open file descriptor.</para>
1083</entry>
1084 </row><row><entry
1085 align="char">
1086<para>EINTERNAL</para>
1087</entry><entry
1088 align="char">
1089<para>Internal error.</para>
1090</entry>
1091 </row></tbody></tgroup></informaltable>
1092
1093</section><section
1094role="subsection"><title>AUDIO_SET_ID</title>
1095<para>DESCRIPTION
1096</para>
1097<informaltable><tgroup cols="1"><tbody><row><entry
1098 align="char">
1099<para>This ioctl selects which sub-stream is to be decoded if a program or system
1100 stream is sent to the video device. If no audio stream type is set the id has to be
1101 in [0xC0,0xDF] for MPEG sound, in [0x80,0x87] for AC3 and in [0xA0,0xA7]
1102 for LPCM. More specifications may follow for other stream types. If the stream
1103 type is set the id just specifies the substream id of the audio stream and only
1104 the first 5 bits are recognized.</para>
1105</entry>
1106 </row></tbody></tgroup></informaltable>
1107<para>SYNOPSIS
1108</para>
1109<informaltable><tgroup cols="1"><tbody><row><entry
1110 align="char">
1111<para>int ioctl(int fd, int request = AUDIO_SET_ID, int
1112 id);</para>
1113</entry>
1114 </row></tbody></tgroup></informaltable>
1115<para>PARAMETERS
1116</para>
1117<informaltable><tgroup cols="2"><tbody><row><entry
1118 align="char">
1119<para>int fd</para>
1120</entry><entry
1121 align="char">
1122<para>File descriptor returned by a previous call to open().</para>
1123</entry>
1124 </row><row><entry
1125 align="char">
1126<para>int request</para>
1127</entry><entry
1128 align="char">
1129<para>Equals AUDIO_SET_ID for this command.</para>
1130</entry>
1131 </row><row><entry
1132 align="char">
1133<para>int id</para>
1134</entry><entry
1135 align="char">
1136<para>audio sub-stream id</para>
1137</entry>
1138 </row></tbody></tgroup></informaltable>
1139<para>ERRORS
1140</para>
1141<informaltable><tgroup cols="2"><tbody><row><entry
1142 align="char">
1143<para>EBADF</para>
1144</entry><entry
1145 align="char">
1146<para>fd is not a valid open file descriptor.</para>
1147</entry>
1148 </row><row><entry
1149 align="char">
1150<para>EINTERNAL</para>
1151</entry><entry
1152 align="char">
1153<para>Internal error.</para>
1154</entry>
1155 </row><row><entry
1156 align="char">
1157<para>EINVAL</para>
1158</entry><entry
1159 align="char">
1160<para>Invalid sub-stream id.</para>
1161</entry>
1162 </row></tbody></tgroup></informaltable>
1163
1164</section><section
1165role="subsection"><title>AUDIO_SET_MIXER</title>
1166<para>DESCRIPTION
1167</para>
1168<informaltable><tgroup cols="1"><tbody><row><entry
1169 align="char">
1170<para>This ioctl lets you adjust the mixer settings of the audio decoder.</para>
1171</entry>
1172 </row></tbody></tgroup></informaltable>
1173<para>SYNOPSIS
1174</para>
1175<informaltable><tgroup cols="1"><tbody><row><entry
1176 align="char">
1177<para>int ioctl(int fd, int request = AUDIO_SET_MIXER,
1178 audio_mixer_t &#x22C6;mix);</para>
1179</entry>
1180 </row></tbody></tgroup></informaltable>
1181<para>PARAMETERS
1182</para>
1183<informaltable><tgroup cols="2"><tbody><row><entry
1184 align="char">
1185<para>int fd</para>
1186</entry><entry
1187 align="char">
1188<para>File descriptor returned by a previous call to open().</para>
1189</entry>
1190 </row><row><entry
1191 align="char">
1192<para>int request</para>
1193</entry><entry
1194 align="char">
1195<para>Equals AUDIO_SET_ID for this command.</para>
1196</entry>
1197 </row><row><entry
1198 align="char">
1199<para>audio_mixer_t *mix</para>
1200</entry><entry
1201 align="char">
1202<para>mixer settings.</para>
1203</entry>
1204 </row></tbody></tgroup></informaltable>
1205<para>ERRORS
1206</para>
1207<informaltable><tgroup cols="2"><tbody><row><entry
1208 align="char">
1209<para>EBADF</para>
1210</entry><entry
1211 align="char">
1212<para>fd is not a valid open file descriptor.</para>
1213</entry>
1214 </row><row><entry
1215 align="char">
1216<para>EINTERNAL</para>
1217</entry><entry
1218 align="char">
1219<para>Internal error.</para>
1220</entry>
1221 </row><row><entry
1222 align="char">
1223<para>EFAULT</para>
1224</entry><entry
1225 align="char">
1226<para>mix points to an invalid address.</para>
1227</entry>
1228 </row></tbody></tgroup></informaltable>
1229
1230</section><section
1231role="subsection"><title>AUDIO_SET_STREAMTYPE</title>
1232<para>DESCRIPTION
1233</para>
1234<informaltable><tgroup cols="1"><tbody><row><entry
1235 align="char">
1236<para>This ioctl tells the driver which kind of audio stream to expect. This is useful
1237 if the stream offers several audio sub-streams like LPCM and AC3.</para>
1238</entry>
1239 </row></tbody></tgroup></informaltable>
1240<para>SYNOPSIS
1241</para>
1242<informaltable><tgroup cols="1"><tbody><row><entry
1243 align="char">
1244<para>int ioctl(fd, int request = AUDIO_SET_STREAMTYPE,
1245 int type);</para>
1246</entry>
1247 </row></tbody></tgroup></informaltable>
1248<para>PARAMETERS
1249</para>
1250<informaltable><tgroup cols="2"><tbody><row><entry
1251 align="char">
1252<para>int fd</para>
1253</entry><entry
1254 align="char">
1255<para>File descriptor returned by a previous call to open().</para>
1256</entry>
1257 </row><row><entry
1258 align="char">
1259<para>int request</para>
1260</entry><entry
1261 align="char">
1262<para>Equals AUDIO_SET_STREAMTYPE for this
1263 command.</para>
1264</entry>
1265 </row><row><entry
1266 align="char">
1267<para>int type</para>
1268</entry><entry
1269 align="char">
1270<para>stream type</para>
1271</entry>
1272 </row></tbody></tgroup></informaltable>
1273<para>ERRORS
1274</para>
1275<informaltable><tgroup cols="2"><tbody><row><entry
1276 align="char">
1277<para>EBADF</para>
1278</entry><entry
1279 align="char">
1280<para>fd is not a valid open file descriptor</para>
1281</entry>
1282 </row><row><entry
1283 align="char">
1284<para>EINVAL</para>
1285</entry><entry
1286 align="char">
1287<para>type is not a valid or supported stream type.</para>
1288</entry>
1289 </row></tbody></tgroup></informaltable>
1290
1291</section><section
1292role="subsection"><title>AUDIO_SET_EXT_ID</title>
1293<para>DESCRIPTION
1294</para>
1295<informaltable><tgroup cols="1"><tbody><row><entry
1296 align="char">
1297<para>This ioctl can be used to set the extension id for MPEG streams in DVD
1298 playback. Only the first 3 bits are recognized.</para>
1299</entry>
1300 </row></tbody></tgroup></informaltable>
1301<para>SYNOPSIS
1302</para>
1303<informaltable><tgroup cols="1"><tbody><row><entry
1304 align="char">
1305<para>int ioctl(fd, int request = AUDIO_SET_EXT_ID, int
1306 id);</para>
1307</entry>
1308 </row></tbody></tgroup></informaltable>
1309<para>PARAMETERS
1310</para>
1311<informaltable><tgroup cols="2"><tbody><row><entry
1312 align="char">
1313<para>int fd</para>
1314</entry><entry
1315 align="char">
1316<para>File descriptor returned by a previous call to open().</para>
1317</entry>
1318 </row><row><entry
1319 align="char">
1320<para>int request</para>
1321</entry><entry
1322 align="char">
1323<para>Equals AUDIO_SET_EXT_ID for this command.</para>
1324</entry>
1325 </row><row><entry
1326 align="char">
1327<para>int id</para>
1328</entry><entry
1329 align="char">
1330<para>audio sub_stream_id</para>
1331</entry>
1332 </row></tbody></tgroup></informaltable>
1333<para>ERRORS
1334</para>
1335<informaltable><tgroup cols="2"><tbody><row><entry
1336 align="char">
1337<para>EBADF</para>
1338</entry><entry
1339 align="char">
1340<para>fd is not a valid open file descriptor</para>
1341</entry>
1342 </row><row><entry
1343 align="char">
1344<para>EINVAL</para>
1345</entry><entry
1346 align="char">
1347<para>id is not a valid id.</para>
1348</entry>
1349 </row></tbody></tgroup></informaltable>
1350
1351</section><section
1352role="subsection"><title>AUDIO_SET_ATTRIBUTES</title>
1353<para>DESCRIPTION
1354</para>
1355<informaltable><tgroup cols="1"><tbody><row><entry
1356 align="char">
1357<para>This ioctl is intended for DVD playback and allows you to set certain
1358 information about the audio stream.</para>
1359</entry>
1360 </row></tbody></tgroup></informaltable>
1361<para>SYNOPSIS
1362</para>
1363<informaltable><tgroup cols="1"><tbody><row><entry
1364 align="char">
1365<para>int ioctl(fd, int request = AUDIO_SET_ATTRIBUTES,
1366 audio_attributes_t attr );</para>
1367</entry>
1368 </row></tbody></tgroup></informaltable>
1369<para>PARAMETERS
1370</para>
1371<informaltable><tgroup cols="2"><tbody><row><entry
1372 align="char">
1373<para>int fd</para>
1374</entry><entry
1375 align="char">
1376<para>File descriptor returned by a previous call to open().</para>
1377</entry>
1378 </row><row><entry
1379 align="char">
1380<para>int request</para>
1381</entry><entry
1382 align="char">
1383<para>Equals AUDIO_SET_ATTRIBUTES for this command.</para>
1384</entry>
1385 </row><row><entry
1386 align="char">
1387<para>audio_attributes_t
1388 attr</para>
1389</entry><entry
1390 align="char">
1391<para>audio attributes according to section ??</para>
1392</entry>
1393 </row></tbody></tgroup></informaltable>
1394<para>ERRORS
1395</para>
1396<informaltable><tgroup cols="2"><tbody><row><entry
1397 align="char">
1398<para>EBADF</para>
1399</entry><entry
1400 align="char">
1401<para>fd is not a valid open file descriptor</para>
1402</entry>
1403 </row><row><entry
1404 align="char">
1405<para>EINVAL</para>
1406</entry><entry
1407 align="char">
1408<para>attr is not a valid or supported attribute setting.</para>
1409</entry>
1410 </row></tbody></tgroup></informaltable>
1411
1412</section><section
1413role="subsection"><title>AUDIO_SET_KARAOKE</title>
1414<para>DESCRIPTION
1415</para>
1416<informaltable><tgroup cols="1"><tbody><row><entry
1417 align="char">
1418<para>This ioctl allows one to set the mixer settings for a karaoke DVD.</para>
1419</entry>
1420 </row></tbody></tgroup></informaltable>
1421<para>SYNOPSIS
1422</para>
1423<informaltable><tgroup cols="1"><tbody><row><entry
1424 align="char">
1425<para>int ioctl(fd, int request = AUDIO_SET_STREAMTYPE,
1426 audio_karaoke_t &#x22C6;karaoke);</para>
1427</entry>
1428 </row></tbody></tgroup></informaltable>
1429<para>PARAMETERS
1430</para>
1431<informaltable><tgroup cols="2"><tbody><row><entry
1432 align="char">
1433<para>int fd</para>
1434</entry><entry
1435 align="char">
1436<para>File descriptor returned by a previous call to open().</para>
1437</entry>
1438 </row><row><entry
1439 align="char">
1440<para>int request</para>
1441</entry><entry
1442 align="char">
1443<para>Equals AUDIO_SET_STREAMTYPE for this
1444 command.</para>
1445</entry>
1446 </row><row><entry
1447 align="char">
1448<para>audio_karaoke_t
1449 *karaoke</para>
1450</entry><entry
1451 align="char">
1452<para>karaoke settings according to section ??.</para>
1453</entry>
1454 </row></tbody></tgroup></informaltable>
1455<para>ERRORS
1456</para>
1457<informaltable><tgroup cols="2"><tbody><row><entry
1458 align="char">
1459<para>EBADF</para>
1460</entry><entry
1461 align="char">
1462<para>fd is not a valid open file descriptor</para>
1463</entry>
1464 </row><row><entry
1465 align="char">
1466<para>EINVAL</para>
1467</entry><entry
1468 align="char">
1469<para>karaoke is not a valid or supported karaoke setting.</para>
1470</entry>
1471 </row></tbody></tgroup></informaltable>
1472 </section>
1473</section>
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-20 17:28:40 -0500