1 /*
2 * ossaudiodev -- Python interface to the OSS (Open Sound System) API.
3 * This is the standard audio API for Linux and some
4 * flavours of BSD [XXX which ones?]; it is also available
5 * for a wide range of commercial Unices.
6 *
7 * Originally written by Peter Bosch, March 2000, as linuxaudiodev.
8 *
9 * Renamed to ossaudiodev and rearranged/revised/hacked up
10 * by Greg Ward <gward@python.net>, November 2002.
11 * Mixer interface by Nicholas FitzRoy-Dale <wzdd@lardcave.net>, Dec 2002.
12 *
13 * (c) 2000 Peter Bosch. All Rights Reserved.
14 * (c) 2002 Gregory P. Ward. All Rights Reserved.
15 * (c) 2002 Python Software Foundation. All Rights Reserved.
16 *
17 * XXX need a license statement
18 *
19 * $Id$
20 */
21
22 #include "Python.h"
23 #include "structmember.h"
24
25 #ifdef HAVE_FCNTL_H
26 #include <fcntl.h>
27 #else
28 #define O_RDONLY 00
29 #define O_WRONLY 01
30 #endif
31
32 #include <sys/ioctl.h>
33 #include <sys/soundcard.h>
34
35 #if defined(linux)
36
37 #ifndef HAVE_STDINT_H
38 typedef unsigned long uint32_t;
39 #endif
40
41 #elif defined(__FreeBSD__)
42
43 # ifndef SNDCTL_DSP_CHANNELS
44 # define SNDCTL_DSP_CHANNELS SOUND_PCM_WRITE_CHANNELS
45 # endif
46
47 #endif
48
49 typedef struct {
50 PyObject_HEAD
51 char *devicename; /* name of the device file */
52 int fd; /* file descriptor */
53 int mode; /* file mode (O_RDONLY, etc.) */
54 int icount; /* input count */
55 int ocount; /* output count */
56 uint32_t afmts; /* audio formats supported by hardware */
57 } oss_audio_t;
58
59 typedef struct {
60 PyObject_HEAD
61 int fd; /* The open mixer device */
62 } oss_mixer_t;
63
64
65 static PyTypeObject OSSAudioType;
66 static PyTypeObject OSSMixerType;
67
68 static PyObject *OSSAudioError;
69
70
71 /* ----------------------------------------------------------------------
72 * DSP object initialization/deallocation
73 */
74
75 static oss_audio_t *
newossobject(PyObject * arg)76 newossobject(PyObject *arg)
77 {
78 oss_audio_t *self;
79 int fd, afmts, imode;
80 char *devicename = NULL;
81 char *mode = NULL;
82
83 /* Two ways to call open():
84 open(device, mode) (for consistency with builtin open())
85 open(mode) (for backwards compatibility)
86 because the *first* argument is optional, parsing args is
87 a wee bit tricky. */
88 if (!PyArg_ParseTuple(arg, "s|s:open", &devicename, &mode))
89 return NULL;
90 if (mode == NULL) { /* only one arg supplied */
91 mode = devicename;
92 devicename = NULL;
93 }
94
95 if (strcmp(mode, "r") == 0)
96 imode = O_RDONLY;
97 else if (strcmp(mode, "w") == 0)
98 imode = O_WRONLY;
99 else if (strcmp(mode, "rw") == 0)
100 imode = O_RDWR;
101 else {
102 PyErr_SetString(OSSAudioError, "mode must be 'r', 'w', or 'rw'");
103 return NULL;
104 }
105
106 /* Open the correct device: either the 'device' argument,
107 or the AUDIODEV environment variable, or "/dev/dsp". */
108 if (devicename == NULL) { /* called with one arg */
109 devicename = getenv("AUDIODEV");
110 if (devicename == NULL) /* $AUDIODEV not set */
111 devicename = "/dev/dsp";
112 }
113
114 /* Open with O_NONBLOCK to avoid hanging on devices that only allow
115 one open at a time. This does *not* affect later I/O; OSS
116 provides a special ioctl() for non-blocking read/write, which is
117 exposed via oss_nonblock() below. */
118 if ((fd = open(devicename, imode|O_NONBLOCK)) == -1) {
119 PyErr_SetFromErrnoWithFilename(PyExc_IOError, devicename);
120 return NULL;
121 }
122
123 /* And (try to) put it back in blocking mode so we get the
124 expected write() semantics. */
125 if (fcntl(fd, F_SETFL, 0) == -1) {
126 close(fd);
127 PyErr_SetFromErrnoWithFilename(PyExc_IOError, devicename);
128 return NULL;
129 }
130
131 if (ioctl(fd, SNDCTL_DSP_GETFMTS, &afmts) == -1) {
132 close(fd);
133 PyErr_SetFromErrnoWithFilename(PyExc_IOError, devicename);
134 return NULL;
135 }
136 /* Create and initialize the object */
137 if ((self = PyObject_New(oss_audio_t, &OSSAudioType)) == NULL) {
138 close(fd);
139 return NULL;
140 }
141 self->devicename = devicename;
142 self->fd = fd;
143 self->mode = imode;
144 self->icount = self->ocount = 0;
145 self->afmts = afmts;
146 return self;
147 }
148
149 static void
oss_dealloc(oss_audio_t * self)150 oss_dealloc(oss_audio_t *self)
151 {
152 /* if already closed, don't reclose it */
153 if (self->fd != -1)
154 close(self->fd);
155 PyObject_Del(self);
156 }
157
158
159 /* ----------------------------------------------------------------------
160 * Mixer object initialization/deallocation
161 */
162
163 static oss_mixer_t *
newossmixerobject(PyObject * arg)164 newossmixerobject(PyObject *arg)
165 {
166 char *devicename = NULL;
167 int fd;
168 oss_mixer_t *self;
169
170 if (!PyArg_ParseTuple(arg, "|s", &devicename)) {
171 return NULL;
172 }
173
174 if (devicename == NULL) {
175 devicename = getenv("MIXERDEV");
176 if (devicename == NULL) /* MIXERDEV not set */
177 devicename = "/dev/mixer";
178 }
179
180 if ((fd = open(devicename, O_RDWR)) == -1) {
181 PyErr_SetFromErrnoWithFilename(PyExc_IOError, devicename);
182 return NULL;
183 }
184
185 if ((self = PyObject_New(oss_mixer_t, &OSSMixerType)) == NULL) {
186 close(fd);
187 return NULL;
188 }
189
190 self->fd = fd;
191
192 return self;
193 }
194
195 static void
oss_mixer_dealloc(oss_mixer_t * self)196 oss_mixer_dealloc(oss_mixer_t *self)
197 {
198 /* if already closed, don't reclose it */
199 if (self->fd != -1)
200 close(self->fd);
201 PyObject_Del(self);
202 }
203
204
205 /* Methods to wrap the OSS ioctls. The calling convention is pretty
206 simple:
207 nonblock() -> ioctl(fd, SNDCTL_DSP_NONBLOCK)
208 fmt = setfmt(fmt) -> ioctl(fd, SNDCTL_DSP_SETFMT, &fmt)
209 etc.
210 */
211
212
213 /* ----------------------------------------------------------------------
214 * Helper functions
215 */
216
217 /* _do_ioctl_1() is a private helper function used for the OSS ioctls --
218 SNDCTL_DSP_{SETFMT,CHANNELS,SPEED} -- that are called from C
219 like this:
220 ioctl(fd, SNDCTL_DSP_cmd, &arg)
221
222 where arg is the value to set, and on return the driver sets arg to
223 the value that was actually set. Mapping this to Python is obvious:
224 arg = dsp.xxx(arg)
225 */
226 static PyObject *
_do_ioctl_1(int fd,PyObject * args,char * fname,int cmd)227 _do_ioctl_1(int fd, PyObject *args, char *fname, int cmd)
228 {
229 char argfmt[33] = "i:";
230 int arg;
231
232 assert(strlen(fname) <= 30);
233 strcat(argfmt, fname);
234 if (!PyArg_ParseTuple(args, argfmt, &arg))
235 return NULL;
236
237 if (ioctl(fd, cmd, &arg) == -1)
238 return PyErr_SetFromErrno(PyExc_IOError);
239 return PyInt_FromLong(arg);
240 }
241
242
243 /* _do_ioctl_1_internal() is a wrapper for ioctls that take no inputs
244 but return an output -- ie. we need to pass a pointer to a local C
245 variable so the driver can write its output there, but from Python
246 all we see is the return value. For example,
247 SOUND_MIXER_READ_DEVMASK returns a bitmask of available mixer
248 devices, but does not use the value of the parameter passed-in in any
249 way.
250 */
251 static PyObject *
_do_ioctl_1_internal(int fd,PyObject * args,char * fname,int cmd)252 _do_ioctl_1_internal(int fd, PyObject *args, char *fname, int cmd)
253 {
254 char argfmt[32] = ":";
255 int arg = 0;
256
257 assert(strlen(fname) <= 30);
258 strcat(argfmt, fname);
259 if (!PyArg_ParseTuple(args, argfmt, &arg))
260 return NULL;
261
262 if (ioctl(fd, cmd, &arg) == -1)
263 return PyErr_SetFromErrno(PyExc_IOError);
264 return PyInt_FromLong(arg);
265 }
266
267
268
269 /* _do_ioctl_0() is a private helper for the no-argument ioctls:
270 SNDCTL_DSP_{SYNC,RESET,POST}. */
271 static PyObject *
_do_ioctl_0(int fd,PyObject * args,char * fname,int cmd)272 _do_ioctl_0(int fd, PyObject *args, char *fname, int cmd)
273 {
274 char argfmt[32] = ":";
275 int rv;
276
277 assert(strlen(fname) <= 30);
278 strcat(argfmt, fname);
279 if (!PyArg_ParseTuple(args, argfmt))
280 return NULL;
281
282 /* According to hannu@opensound.com, all three of the ioctls that
283 use this function can block, so release the GIL. This is
284 especially important for SYNC, which can block for several
285 seconds. */
286 Py_BEGIN_ALLOW_THREADS
287 rv = ioctl(fd, cmd, 0);
288 Py_END_ALLOW_THREADS
289
290 if (rv == -1)
291 return PyErr_SetFromErrno(PyExc_IOError);
292 Py_INCREF(Py_None);
293 return Py_None;
294 }
295
296
297 /* ----------------------------------------------------------------------
298 * Methods of DSP objects (OSSAudioType)
299 */
300
301 static PyObject *
oss_nonblock(oss_audio_t * self,PyObject * unused)302 oss_nonblock(oss_audio_t *self, PyObject *unused)
303 {
304 /* Hmmm: it doesn't appear to be possible to return to blocking
305 mode once we're in non-blocking mode! */
306 if (ioctl(self->fd, SNDCTL_DSP_NONBLOCK, NULL) == -1)
307 return PyErr_SetFromErrno(PyExc_IOError);
308 Py_INCREF(Py_None);
309 return Py_None;
310 }
311
312 static PyObject *
oss_setfmt(oss_audio_t * self,PyObject * args)313 oss_setfmt(oss_audio_t *self, PyObject *args)
314 {
315 return _do_ioctl_1(self->fd, args, "setfmt", SNDCTL_DSP_SETFMT);
316 }
317
318 static PyObject *
oss_getfmts(oss_audio_t * self,PyObject * unused)319 oss_getfmts(oss_audio_t *self, PyObject *unused)
320 {
321 int mask;
322 if (ioctl(self->fd, SNDCTL_DSP_GETFMTS, &mask) == -1)
323 return PyErr_SetFromErrno(PyExc_IOError);
324 return PyInt_FromLong(mask);
325 }
326
327 static PyObject *
oss_channels(oss_audio_t * self,PyObject * args)328 oss_channels(oss_audio_t *self, PyObject *args)
329 {
330 return _do_ioctl_1(self->fd, args, "channels", SNDCTL_DSP_CHANNELS);
331 }
332
333 static PyObject *
oss_speed(oss_audio_t * self,PyObject * args)334 oss_speed(oss_audio_t *self, PyObject *args)
335 {
336 return _do_ioctl_1(self->fd, args, "speed", SNDCTL_DSP_SPEED);
337 }
338
339 static PyObject *
oss_sync(oss_audio_t * self,PyObject * args)340 oss_sync(oss_audio_t *self, PyObject *args)
341 {
342 return _do_ioctl_0(self->fd, args, "sync", SNDCTL_DSP_SYNC);
343 }
344
345 static PyObject *
oss_reset(oss_audio_t * self,PyObject * args)346 oss_reset(oss_audio_t *self, PyObject *args)
347 {
348 return _do_ioctl_0(self->fd, args, "reset", SNDCTL_DSP_RESET);
349 }
350
351 static PyObject *
oss_post(oss_audio_t * self,PyObject * args)352 oss_post(oss_audio_t *self, PyObject *args)
353 {
354 return _do_ioctl_0(self->fd, args, "post", SNDCTL_DSP_POST);
355 }
356
357
358 /* Regular file methods: read(), write(), close(), etc. as well
359 as one convenience method, writeall(). */
360
361 static PyObject *
oss_read(oss_audio_t * self,PyObject * args)362 oss_read(oss_audio_t *self, PyObject *args)
363 {
364 int size, count;
365 char *cp;
366 PyObject *rv;
367
368 if (!PyArg_ParseTuple(args, "i:read", &size))
369 return NULL;
370 rv = PyString_FromStringAndSize(NULL, size);
371 if (rv == NULL)
372 return NULL;
373 cp = PyString_AS_STRING(rv);
374
375 Py_BEGIN_ALLOW_THREADS
376 count = read(self->fd, cp, size);
377 Py_END_ALLOW_THREADS
378
379 if (count < 0) {
380 PyErr_SetFromErrno(PyExc_IOError);
381 Py_DECREF(rv);
382 return NULL;
383 }
384 self->icount += count;
385 _PyString_Resize(&rv, count);
386 return rv;
387 }
388
389 static PyObject *
oss_write(oss_audio_t * self,PyObject * args)390 oss_write(oss_audio_t *self, PyObject *args)
391 {
392 char *cp;
393 int rv, size;
394
395 if (!PyArg_ParseTuple(args, "s#:write", &cp, &size)) {
396 return NULL;
397 }
398
399 Py_BEGIN_ALLOW_THREADS
400 rv = write(self->fd, cp, size);
401 Py_END_ALLOW_THREADS
402
403 if (rv == -1) {
404 return PyErr_SetFromErrno(PyExc_IOError);
405 } else {
406 self->ocount += rv;
407 }
408 return PyInt_FromLong(rv);
409 }
410
411 static PyObject *
oss_writeall(oss_audio_t * self,PyObject * args)412 oss_writeall(oss_audio_t *self, PyObject *args)
413 {
414 char *cp;
415 int rv, size;
416 fd_set write_set_fds;
417 int select_rv;
418
419 /* NB. writeall() is only useful in non-blocking mode: according to
420 Guenter Geiger <geiger@xdv.org> on the linux-audio-dev list
421 (http://eca.cx/lad/2002/11/0380.html), OSS guarantees that
422 write() in blocking mode consumes the whole buffer. In blocking
423 mode, the behaviour of write() and writeall() from Python is
424 indistinguishable. */
425
426 if (!PyArg_ParseTuple(args, "s#:write", &cp, &size))
427 return NULL;
428
429 if (!_PyIsSelectable_fd(self->fd)) {
430 PyErr_SetString(PyExc_ValueError,
431 "file descriptor out of range for select");
432 return NULL;
433 }
434 /* use select to wait for audio device to be available */
435 FD_ZERO(&write_set_fds);
436 FD_SET(self->fd, &write_set_fds);
437
438 while (size > 0) {
439 Py_BEGIN_ALLOW_THREADS
440 select_rv = select(self->fd+1, NULL, &write_set_fds, NULL, NULL);
441 Py_END_ALLOW_THREADS
442 assert(select_rv != 0); /* no timeout, can't expire */
443 if (select_rv == -1)
444 return PyErr_SetFromErrno(PyExc_IOError);
445
446 Py_BEGIN_ALLOW_THREADS
447 rv = write(self->fd, cp, size);
448 Py_END_ALLOW_THREADS
449 if (rv == -1) {
450 if (errno == EAGAIN) { /* buffer is full, try again */
451 errno = 0;
452 continue;
453 } else /* it's a real error */
454 return PyErr_SetFromErrno(PyExc_IOError);
455 } else { /* wrote rv bytes */
456 self->ocount += rv;
457 size -= rv;
458 cp += rv;
459 }
460 }
461 Py_INCREF(Py_None);
462 return Py_None;
463 }
464
465 static PyObject *
oss_close(oss_audio_t * self,PyObject * unused)466 oss_close(oss_audio_t *self, PyObject *unused)
467 {
468 if (self->fd >= 0) {
469 Py_BEGIN_ALLOW_THREADS
470 close(self->fd);
471 Py_END_ALLOW_THREADS
472 self->fd = -1;
473 }
474 Py_INCREF(Py_None);
475 return Py_None;
476 }
477
478 static PyObject *
oss_fileno(oss_audio_t * self,PyObject * unused)479 oss_fileno(oss_audio_t *self, PyObject *unused)
480 {
481 return PyInt_FromLong(self->fd);
482 }
483
484
485 /* Convenience methods: these generally wrap a couple of ioctls into one
486 common task. */
487
488 static PyObject *
oss_setparameters(oss_audio_t * self,PyObject * args)489 oss_setparameters(oss_audio_t *self, PyObject *args)
490 {
491 int wanted_fmt, wanted_channels, wanted_rate, strict=0;
492 int fmt, channels, rate;
493
494 if (!PyArg_ParseTuple(args, "iii|i:setparameters",
495 &wanted_fmt, &wanted_channels, &wanted_rate,
496 &strict))
497 return NULL;
498
499 fmt = wanted_fmt;
500 if (ioctl(self->fd, SNDCTL_DSP_SETFMT, &fmt) == -1) {
501 return PyErr_SetFromErrno(PyExc_IOError);
502 }
503 if (strict && fmt != wanted_fmt) {
504 return PyErr_Format
505 (OSSAudioError,
506 "unable to set requested format (wanted %d, got %d)",
507 wanted_fmt, fmt);
508 }
509
510 channels = wanted_channels;
511 if (ioctl(self->fd, SNDCTL_DSP_CHANNELS, &channels) == -1) {
512 return PyErr_SetFromErrno(PyExc_IOError);
513 }
514 if (strict && channels != wanted_channels) {
515 return PyErr_Format
516 (OSSAudioError,
517 "unable to set requested channels (wanted %d, got %d)",
518 wanted_channels, channels);
519 }
520
521 rate = wanted_rate;
522 if (ioctl(self->fd, SNDCTL_DSP_SPEED, &rate) == -1) {
523 return PyErr_SetFromErrno(PyExc_IOError);
524 }
525 if (strict && rate != wanted_rate) {
526 return PyErr_Format
527 (OSSAudioError,
528 "unable to set requested rate (wanted %d, got %d)",
529 wanted_rate, rate);
530 }
531
532 /* Construct the return value: a (fmt, channels, rate) tuple that
533 tells what the audio hardware was actually set to. */
534 return Py_BuildValue("(iii)", fmt, channels, rate);
535 }
536
537 static int
_ssize(oss_audio_t * self,int * nchannels,int * ssize)538 _ssize(oss_audio_t *self, int *nchannels, int *ssize)
539 {
540 int fmt;
541
542 fmt = 0;
543 if (ioctl(self->fd, SNDCTL_DSP_SETFMT, &fmt) < 0)
544 return -errno;
545
546 switch (fmt) {
547 case AFMT_MU_LAW:
548 case AFMT_A_LAW:
549 case AFMT_U8:
550 case AFMT_S8:
551 *ssize = 1; /* 8 bit formats: 1 byte */
552 break;
553 case AFMT_S16_LE:
554 case AFMT_S16_BE:
555 case AFMT_U16_LE:
556 case AFMT_U16_BE:
557 *ssize = 2; /* 16 bit formats: 2 byte */
558 break;
559 case AFMT_MPEG:
560 case AFMT_IMA_ADPCM:
561 default:
562 return -EOPNOTSUPP;
563 }
564 if (ioctl(self->fd, SNDCTL_DSP_CHANNELS, nchannels) < 0)
565 return -errno;
566 return 0;
567 }
568
569
570 /* bufsize returns the size of the hardware audio buffer in number
571 of samples */
572 static PyObject *
oss_bufsize(oss_audio_t * self,PyObject * unused)573 oss_bufsize(oss_audio_t *self, PyObject *unused)
574 {
575 audio_buf_info ai;
576 int nchannels=0, ssize=0;
577
578 if (_ssize(self, &nchannels, &ssize) < 0 || !nchannels || !ssize) {
579 PyErr_SetFromErrno(PyExc_IOError);
580 return NULL;
581 }
582 if (ioctl(self->fd, SNDCTL_DSP_GETOSPACE, &ai) < 0) {
583 PyErr_SetFromErrno(PyExc_IOError);
584 return NULL;
585 }
586 return PyInt_FromLong((ai.fragstotal * ai.fragsize) / (nchannels * ssize));
587 }
588
589 /* obufcount returns the number of samples that are available in the
590 hardware for playing */
591 static PyObject *
oss_obufcount(oss_audio_t * self,PyObject * unused)592 oss_obufcount(oss_audio_t *self, PyObject *unused)
593 {
594 audio_buf_info ai;
595 int nchannels=0, ssize=0;
596
597 if (_ssize(self, &nchannels, &ssize) < 0 || !nchannels || !ssize) {
598 PyErr_SetFromErrno(PyExc_IOError);
599 return NULL;
600 }
601 if (ioctl(self->fd, SNDCTL_DSP_GETOSPACE, &ai) < 0) {
602 PyErr_SetFromErrno(PyExc_IOError);
603 return NULL;
604 }
605 return PyInt_FromLong((ai.fragstotal * ai.fragsize - ai.bytes) /
606 (ssize * nchannels));
607 }
608
609 /* obufcount returns the number of samples that can be played without
610 blocking */
611 static PyObject *
oss_obuffree(oss_audio_t * self,PyObject * unused)612 oss_obuffree(oss_audio_t *self, PyObject *unused)
613 {
614 audio_buf_info ai;
615 int nchannels=0, ssize=0;
616
617 if (_ssize(self, &nchannels, &ssize) < 0 || !nchannels || !ssize) {
618 PyErr_SetFromErrno(PyExc_IOError);
619 return NULL;
620 }
621 if (ioctl(self->fd, SNDCTL_DSP_GETOSPACE, &ai) < 0) {
622 PyErr_SetFromErrno(PyExc_IOError);
623 return NULL;
624 }
625 return PyInt_FromLong(ai.bytes / (ssize * nchannels));
626 }
627
628 static PyObject *
oss_getptr(oss_audio_t * self,PyObject * unused)629 oss_getptr(oss_audio_t *self, PyObject *unused)
630 {
631 count_info info;
632 int req;
633
634 if (self->mode == O_RDONLY)
635 req = SNDCTL_DSP_GETIPTR;
636 else
637 req = SNDCTL_DSP_GETOPTR;
638 if (ioctl(self->fd, req, &info) == -1) {
639 PyErr_SetFromErrno(PyExc_IOError);
640 return NULL;
641 }
642 return Py_BuildValue("iii", info.bytes, info.blocks, info.ptr);
643 }
644
645
646 /* ----------------------------------------------------------------------
647 * Methods of mixer objects (OSSMixerType)
648 */
649
650 static PyObject *
oss_mixer_close(oss_mixer_t * self,PyObject * unused)651 oss_mixer_close(oss_mixer_t *self, PyObject *unused)
652 {
653 if (self->fd >= 0) {
654 close(self->fd);
655 self->fd = -1;
656 }
657 Py_INCREF(Py_None);
658 return Py_None;
659 }
660
661 static PyObject *
oss_mixer_fileno(oss_mixer_t * self,PyObject * unused)662 oss_mixer_fileno(oss_mixer_t *self, PyObject *unused)
663 {
664 return PyInt_FromLong(self->fd);
665 }
666
667 /* Simple mixer interface methods */
668
669 static PyObject *
oss_mixer_controls(oss_mixer_t * self,PyObject * args)670 oss_mixer_controls(oss_mixer_t *self, PyObject *args)
671 {
672 return _do_ioctl_1_internal(self->fd, args, "controls",
673 SOUND_MIXER_READ_DEVMASK);
674 }
675
676 static PyObject *
oss_mixer_stereocontrols(oss_mixer_t * self,PyObject * args)677 oss_mixer_stereocontrols(oss_mixer_t *self, PyObject *args)
678 {
679 return _do_ioctl_1_internal(self->fd, args, "stereocontrols",
680 SOUND_MIXER_READ_STEREODEVS);
681 }
682
683 static PyObject *
oss_mixer_reccontrols(oss_mixer_t * self,PyObject * args)684 oss_mixer_reccontrols(oss_mixer_t *self, PyObject *args)
685 {
686 return _do_ioctl_1_internal(self->fd, args, "reccontrols",
687 SOUND_MIXER_READ_RECMASK);
688 }
689
690 static PyObject *
oss_mixer_get(oss_mixer_t * self,PyObject * args)691 oss_mixer_get(oss_mixer_t *self, PyObject *args)
692 {
693 int channel, volume;
694
695 /* Can't use _do_ioctl_1 because of encoded arg thingy. */
696 if (!PyArg_ParseTuple(args, "i:get", &channel))
697 return NULL;
698
699 if (channel < 0 || channel > SOUND_MIXER_NRDEVICES) {
700 PyErr_SetString(OSSAudioError, "Invalid mixer channel specified.");
701 return NULL;
702 }
703
704 if (ioctl(self->fd, MIXER_READ(channel), &volume) == -1)
705 return PyErr_SetFromErrno(PyExc_IOError);
706
707 return Py_BuildValue("(ii)", volume & 0xff, (volume & 0xff00) >> 8);
708 }
709
710 static PyObject *
oss_mixer_set(oss_mixer_t * self,PyObject * args)711 oss_mixer_set(oss_mixer_t *self, PyObject *args)
712 {
713 int channel, volume, leftVol, rightVol;
714
715 /* Can't use _do_ioctl_1 because of encoded arg thingy. */
716 if (!PyArg_ParseTuple(args, "i(ii):set", &channel, &leftVol, &rightVol))
717 return NULL;
718
719 if (channel < 0 || channel > SOUND_MIXER_NRDEVICES) {
720 PyErr_SetString(OSSAudioError, "Invalid mixer channel specified.");
721 return NULL;
722 }
723
724 if (leftVol < 0 || rightVol < 0 || leftVol > 100 || rightVol > 100) {
725 PyErr_SetString(OSSAudioError, "Volumes must be between 0 and 100.");
726 return NULL;
727 }
728
729 volume = (rightVol << 8) | leftVol;
730
731 if (ioctl(self->fd, MIXER_WRITE(channel), &volume) == -1)
732 return PyErr_SetFromErrno(PyExc_IOError);
733
734 return Py_BuildValue("(ii)", volume & 0xff, (volume & 0xff00) >> 8);
735 }
736
737 static PyObject *
oss_mixer_get_recsrc(oss_mixer_t * self,PyObject * args)738 oss_mixer_get_recsrc(oss_mixer_t *self, PyObject *args)
739 {
740 return _do_ioctl_1_internal(self->fd, args, "get_recsrc",
741 SOUND_MIXER_READ_RECSRC);
742 }
743
744 static PyObject *
oss_mixer_set_recsrc(oss_mixer_t * self,PyObject * args)745 oss_mixer_set_recsrc(oss_mixer_t *self, PyObject *args)
746 {
747 return _do_ioctl_1(self->fd, args, "set_recsrc",
748 SOUND_MIXER_WRITE_RECSRC);
749 }
750
751
752 /* ----------------------------------------------------------------------
753 * Method tables and other bureaucracy
754 */
755
756 static PyMethodDef oss_methods[] = {
757 /* Regular file methods */
758 { "read", (PyCFunction)oss_read, METH_VARARGS },
759 { "write", (PyCFunction)oss_write, METH_VARARGS },
760 { "writeall", (PyCFunction)oss_writeall, METH_VARARGS },
761 { "close", (PyCFunction)oss_close, METH_NOARGS },
762 { "fileno", (PyCFunction)oss_fileno, METH_NOARGS },
763
764 /* Simple ioctl wrappers */
765 { "nonblock", (PyCFunction)oss_nonblock, METH_NOARGS },
766 { "setfmt", (PyCFunction)oss_setfmt, METH_VARARGS },
767 { "getfmts", (PyCFunction)oss_getfmts, METH_NOARGS },
768 { "channels", (PyCFunction)oss_channels, METH_VARARGS },
769 { "speed", (PyCFunction)oss_speed, METH_VARARGS },
770 { "sync", (PyCFunction)oss_sync, METH_VARARGS },
771 { "reset", (PyCFunction)oss_reset, METH_VARARGS },
772 { "post", (PyCFunction)oss_post, METH_VARARGS },
773
774 /* Convenience methods -- wrap a couple of ioctls together */
775 { "setparameters", (PyCFunction)oss_setparameters, METH_VARARGS },
776 { "bufsize", (PyCFunction)oss_bufsize, METH_NOARGS },
777 { "obufcount", (PyCFunction)oss_obufcount, METH_NOARGS },
778 { "obuffree", (PyCFunction)oss_obuffree, METH_NOARGS },
779 { "getptr", (PyCFunction)oss_getptr, METH_NOARGS },
780
781 /* Aliases for backwards compatibility */
782 { "flush", (PyCFunction)oss_sync, METH_VARARGS },
783
784 { NULL, NULL} /* sentinel */
785 };
786
787 static PyMethodDef oss_mixer_methods[] = {
788 /* Regular file method - OSS mixers are ioctl-only interface */
789 { "close", (PyCFunction)oss_mixer_close, METH_NOARGS },
790 { "fileno", (PyCFunction)oss_mixer_fileno, METH_NOARGS },
791
792 /* Simple ioctl wrappers */
793 { "controls", (PyCFunction)oss_mixer_controls, METH_VARARGS },
794 { "stereocontrols", (PyCFunction)oss_mixer_stereocontrols, METH_VARARGS},
795 { "reccontrols", (PyCFunction)oss_mixer_reccontrols, METH_VARARGS},
796 { "get", (PyCFunction)oss_mixer_get, METH_VARARGS },
797 { "set", (PyCFunction)oss_mixer_set, METH_VARARGS },
798 { "get_recsrc", (PyCFunction)oss_mixer_get_recsrc, METH_VARARGS },
799 { "set_recsrc", (PyCFunction)oss_mixer_set_recsrc, METH_VARARGS },
800
801 { NULL, NULL}
802 };
803
804 static PyObject *
oss_getattr(oss_audio_t * self,char * name)805 oss_getattr(oss_audio_t *self, char *name)
806 {
807 PyObject * rval = NULL;
808 if (strcmp(name, "closed") == 0) {
809 rval = (self->fd == -1) ? Py_True : Py_False;
810 Py_INCREF(rval);
811 }
812 else if (strcmp(name, "name") == 0) {
813 rval = PyString_FromString(self->devicename);
814 }
815 else if (strcmp(name, "mode") == 0) {
816 /* No need for a "default" in this switch: from newossobject(),
817 self->mode can only be one of these three values. */
818 switch(self->mode) {
819 case O_RDONLY:
820 rval = PyString_FromString("r");
821 break;
822 case O_RDWR:
823 rval = PyString_FromString("rw");
824 break;
825 case O_WRONLY:
826 rval = PyString_FromString("w");
827 break;
828 }
829 }
830 else {
831 rval = Py_FindMethod(oss_methods, (PyObject *)self, name);
832 }
833 return rval;
834 }
835
836 static PyObject *
oss_mixer_getattr(oss_mixer_t * self,char * name)837 oss_mixer_getattr(oss_mixer_t *self, char *name)
838 {
839 return Py_FindMethod(oss_mixer_methods, (PyObject *)self, name);
840 }
841
842 static PyTypeObject OSSAudioType = {
843 PyVarObject_HEAD_INIT(&PyType_Type, 0)
844 "ossaudiodev.oss_audio_device", /*tp_name*/
845 sizeof(oss_audio_t), /*tp_size*/
846 0, /*tp_itemsize*/
847 /* methods */
848 (destructor)oss_dealloc, /*tp_dealloc*/
849 0, /*tp_print*/
850 (getattrfunc)oss_getattr, /*tp_getattr*/
851 0, /*tp_setattr*/
852 0, /*tp_compare*/
853 0, /*tp_repr*/
854 };
855
856 static PyTypeObject OSSMixerType = {
857 PyVarObject_HEAD_INIT(&PyType_Type, 0)
858 "ossaudiodev.oss_mixer_device", /*tp_name*/
859 sizeof(oss_mixer_t), /*tp_size*/
860 0, /*tp_itemsize*/
861 /* methods */
862 (destructor)oss_mixer_dealloc, /*tp_dealloc*/
863 0, /*tp_print*/
864 (getattrfunc)oss_mixer_getattr, /*tp_getattr*/
865 0, /*tp_setattr*/
866 0, /*tp_compare*/
867 0, /*tp_repr*/
868 };
869
870
871 static PyObject *
ossopen(PyObject * self,PyObject * args)872 ossopen(PyObject *self, PyObject *args)
873 {
874 return (PyObject *)newossobject(args);
875 }
876
877 static PyObject *
ossopenmixer(PyObject * self,PyObject * args)878 ossopenmixer(PyObject *self, PyObject *args)
879 {
880 return (PyObject *)newossmixerobject(args);
881 }
882
883 static PyMethodDef ossaudiodev_methods[] = {
884 { "open", ossopen, METH_VARARGS },
885 { "openmixer", ossopenmixer, METH_VARARGS },
886 { 0, 0 },
887 };
888
889
890 #define _EXPORT_INT(mod, name) \
891 if (PyModule_AddIntConstant(mod, #name, (long) (name)) == -1) return;
892
893
894 static char *control_labels[] = SOUND_DEVICE_LABELS;
895 static char *control_names[] = SOUND_DEVICE_NAMES;
896
897
898 static int
build_namelists(PyObject * module)899 build_namelists (PyObject *module)
900 {
901 PyObject *labels;
902 PyObject *names;
903 PyObject *s;
904 int num_controls;
905 int i;
906
907 num_controls = sizeof(control_labels) / sizeof(control_labels[0]);
908 assert(num_controls == sizeof(control_names) / sizeof(control_names[0]));
909
910 labels = PyList_New(num_controls);
911 names = PyList_New(num_controls);
912 if (labels == NULL || names == NULL)
913 goto error2;
914 for (i = 0; i < num_controls; i++) {
915 s = PyString_FromString(control_labels[i]);
916 if (s == NULL)
917 goto error2;
918 PyList_SET_ITEM(labels, i, s);
919
920 s = PyString_FromString(control_names[i]);
921 if (s == NULL)
922 goto error2;
923 PyList_SET_ITEM(names, i, s);
924 }
925
926 if (PyModule_AddObject(module, "control_labels", labels) == -1)
927 goto error2;
928 if (PyModule_AddObject(module, "control_names", names) == -1)
929 goto error1;
930
931 return 0;
932
933 error2:
934 Py_XDECREF(labels);
935 error1:
936 Py_XDECREF(names);
937 return -1;
938 }
939
940
941 void
initossaudiodev(void)942 initossaudiodev(void)
943 {
944 PyObject *m;
945
946 m = Py_InitModule("ossaudiodev", ossaudiodev_methods);
947 if (m == NULL)
948 return;
949
950 OSSAudioError = PyErr_NewException("ossaudiodev.OSSAudioError",
951 NULL, NULL);
952 if (OSSAudioError) {
953 /* Each call to PyModule_AddObject decrefs it; compensate: */
954 Py_INCREF(OSSAudioError);
955 Py_INCREF(OSSAudioError);
956 PyModule_AddObject(m, "error", OSSAudioError);
957 PyModule_AddObject(m, "OSSAudioError", OSSAudioError);
958 }
959
960 /* Build 'control_labels' and 'control_names' lists and add them
961 to the module. */
962 if (build_namelists(m) == -1) /* XXX what to do here? */
963 return;
964
965 /* Expose the audio format numbers -- essential! */
966 _EXPORT_INT(m, AFMT_QUERY);
967 _EXPORT_INT(m, AFMT_MU_LAW);
968 _EXPORT_INT(m, AFMT_A_LAW);
969 _EXPORT_INT(m, AFMT_IMA_ADPCM);
970 _EXPORT_INT(m, AFMT_U8);
971 _EXPORT_INT(m, AFMT_S16_LE);
972 _EXPORT_INT(m, AFMT_S16_BE);
973 _EXPORT_INT(m, AFMT_S8);
974 _EXPORT_INT(m, AFMT_U16_LE);
975 _EXPORT_INT(m, AFMT_U16_BE);
976 _EXPORT_INT(m, AFMT_MPEG);
977 #ifdef AFMT_AC3
978 _EXPORT_INT(m, AFMT_AC3);
979 #endif
980 #ifdef AFMT_S16_NE
981 _EXPORT_INT(m, AFMT_S16_NE);
982 #endif
983 #ifdef AFMT_U16_NE
984 _EXPORT_INT(m, AFMT_U16_NE);
985 #endif
986 #ifdef AFMT_S32_LE
987 _EXPORT_INT(m, AFMT_S32_LE);
988 #endif
989 #ifdef AFMT_S32_BE
990 _EXPORT_INT(m, AFMT_S32_BE);
991 #endif
992 #ifdef AFMT_MPEG
993 _EXPORT_INT(m, AFMT_MPEG);
994 #endif
995
996 /* Expose the sound mixer device numbers. */
997 _EXPORT_INT(m, SOUND_MIXER_NRDEVICES);
998 _EXPORT_INT(m, SOUND_MIXER_VOLUME);
999 _EXPORT_INT(m, SOUND_MIXER_BASS);
1000 _EXPORT_INT(m, SOUND_MIXER_TREBLE);
1001 _EXPORT_INT(m, SOUND_MIXER_SYNTH);
1002 _EXPORT_INT(m, SOUND_MIXER_PCM);
1003 _EXPORT_INT(m, SOUND_MIXER_SPEAKER);
1004 _EXPORT_INT(m, SOUND_MIXER_LINE);
1005 _EXPORT_INT(m, SOUND_MIXER_MIC);
1006 _EXPORT_INT(m, SOUND_MIXER_CD);
1007 _EXPORT_INT(m, SOUND_MIXER_IMIX);
1008 _EXPORT_INT(m, SOUND_MIXER_ALTPCM);
1009 _EXPORT_INT(m, SOUND_MIXER_RECLEV);
1010 _EXPORT_INT(m, SOUND_MIXER_IGAIN);
1011 _EXPORT_INT(m, SOUND_MIXER_OGAIN);
1012 _EXPORT_INT(m, SOUND_MIXER_LINE1);
1013 _EXPORT_INT(m, SOUND_MIXER_LINE2);
1014 _EXPORT_INT(m, SOUND_MIXER_LINE3);
1015 #ifdef SOUND_MIXER_DIGITAL1
1016 _EXPORT_INT(m, SOUND_MIXER_DIGITAL1);
1017 #endif
1018 #ifdef SOUND_MIXER_DIGITAL2
1019 _EXPORT_INT(m, SOUND_MIXER_DIGITAL2);
1020 #endif
1021 #ifdef SOUND_MIXER_DIGITAL3
1022 _EXPORT_INT(m, SOUND_MIXER_DIGITAL3);
1023 #endif
1024 #ifdef SOUND_MIXER_PHONEIN
1025 _EXPORT_INT(m, SOUND_MIXER_PHONEIN);
1026 #endif
1027 #ifdef SOUND_MIXER_PHONEOUT
1028 _EXPORT_INT(m, SOUND_MIXER_PHONEOUT);
1029 #endif
1030 #ifdef SOUND_MIXER_VIDEO
1031 _EXPORT_INT(m, SOUND_MIXER_VIDEO);
1032 #endif
1033 #ifdef SOUND_MIXER_RADIO
1034 _EXPORT_INT(m, SOUND_MIXER_RADIO);
1035 #endif
1036 #ifdef SOUND_MIXER_MONITOR
1037 _EXPORT_INT(m, SOUND_MIXER_MONITOR);
1038 #endif
1039
1040 /* Expose all the ioctl numbers for masochists who like to do this
1041 stuff directly. */
1042 _EXPORT_INT(m, SNDCTL_COPR_HALT);
1043 _EXPORT_INT(m, SNDCTL_COPR_LOAD);
1044 _EXPORT_INT(m, SNDCTL_COPR_RCODE);
1045 _EXPORT_INT(m, SNDCTL_COPR_RCVMSG);
1046 _EXPORT_INT(m, SNDCTL_COPR_RDATA);
1047 _EXPORT_INT(m, SNDCTL_COPR_RESET);
1048 _EXPORT_INT(m, SNDCTL_COPR_RUN);
1049 _EXPORT_INT(m, SNDCTL_COPR_SENDMSG);
1050 _EXPORT_INT(m, SNDCTL_COPR_WCODE);
1051 _EXPORT_INT(m, SNDCTL_COPR_WDATA);
1052 #ifdef SNDCTL_DSP_BIND_CHANNEL
1053 _EXPORT_INT(m, SNDCTL_DSP_BIND_CHANNEL);
1054 #endif
1055 _EXPORT_INT(m, SNDCTL_DSP_CHANNELS);
1056 _EXPORT_INT(m, SNDCTL_DSP_GETBLKSIZE);
1057 _EXPORT_INT(m, SNDCTL_DSP_GETCAPS);
1058 #ifdef SNDCTL_DSP_GETCHANNELMASK
1059 _EXPORT_INT(m, SNDCTL_DSP_GETCHANNELMASK);
1060 #endif
1061 _EXPORT_INT(m, SNDCTL_DSP_GETFMTS);
1062 _EXPORT_INT(m, SNDCTL_DSP_GETIPTR);
1063 _EXPORT_INT(m, SNDCTL_DSP_GETISPACE);
1064 #ifdef SNDCTL_DSP_GETODELAY
1065 _EXPORT_INT(m, SNDCTL_DSP_GETODELAY);
1066 #endif
1067 _EXPORT_INT(m, SNDCTL_DSP_GETOPTR);
1068 _EXPORT_INT(m, SNDCTL_DSP_GETOSPACE);
1069 #ifdef SNDCTL_DSP_GETSPDIF
1070 _EXPORT_INT(m, SNDCTL_DSP_GETSPDIF);
1071 #endif
1072 _EXPORT_INT(m, SNDCTL_DSP_GETTRIGGER);
1073 _EXPORT_INT(m, SNDCTL_DSP_MAPINBUF);
1074 _EXPORT_INT(m, SNDCTL_DSP_MAPOUTBUF);
1075 _EXPORT_INT(m, SNDCTL_DSP_NONBLOCK);
1076 _EXPORT_INT(m, SNDCTL_DSP_POST);
1077 #ifdef SNDCTL_DSP_PROFILE
1078 _EXPORT_INT(m, SNDCTL_DSP_PROFILE);
1079 #endif
1080 _EXPORT_INT(m, SNDCTL_DSP_RESET);
1081 _EXPORT_INT(m, SNDCTL_DSP_SAMPLESIZE);
1082 _EXPORT_INT(m, SNDCTL_DSP_SETDUPLEX);
1083 _EXPORT_INT(m, SNDCTL_DSP_SETFMT);
1084 _EXPORT_INT(m, SNDCTL_DSP_SETFRAGMENT);
1085 #ifdef SNDCTL_DSP_SETSPDIF
1086 _EXPORT_INT(m, SNDCTL_DSP_SETSPDIF);
1087 #endif
1088 _EXPORT_INT(m, SNDCTL_DSP_SETSYNCRO);
1089 _EXPORT_INT(m, SNDCTL_DSP_SETTRIGGER);
1090 _EXPORT_INT(m, SNDCTL_DSP_SPEED);
1091 _EXPORT_INT(m, SNDCTL_DSP_STEREO);
1092 _EXPORT_INT(m, SNDCTL_DSP_SUBDIVIDE);
1093 _EXPORT_INT(m, SNDCTL_DSP_SYNC);
1094 _EXPORT_INT(m, SNDCTL_FM_4OP_ENABLE);
1095 _EXPORT_INT(m, SNDCTL_FM_LOAD_INSTR);
1096 _EXPORT_INT(m, SNDCTL_MIDI_INFO);
1097 _EXPORT_INT(m, SNDCTL_MIDI_MPUCMD);
1098 _EXPORT_INT(m, SNDCTL_MIDI_MPUMODE);
1099 _EXPORT_INT(m, SNDCTL_MIDI_PRETIME);
1100 _EXPORT_INT(m, SNDCTL_SEQ_CTRLRATE);
1101 _EXPORT_INT(m, SNDCTL_SEQ_GETINCOUNT);
1102 _EXPORT_INT(m, SNDCTL_SEQ_GETOUTCOUNT);
1103 #ifdef SNDCTL_SEQ_GETTIME
1104 _EXPORT_INT(m, SNDCTL_SEQ_GETTIME);
1105 #endif
1106 _EXPORT_INT(m, SNDCTL_SEQ_NRMIDIS);
1107 _EXPORT_INT(m, SNDCTL_SEQ_NRSYNTHS);
1108 _EXPORT_INT(m, SNDCTL_SEQ_OUTOFBAND);
1109 _EXPORT_INT(m, SNDCTL_SEQ_PANIC);
1110 _EXPORT_INT(m, SNDCTL_SEQ_PERCMODE);
1111 _EXPORT_INT(m, SNDCTL_SEQ_RESET);
1112 _EXPORT_INT(m, SNDCTL_SEQ_RESETSAMPLES);
1113 _EXPORT_INT(m, SNDCTL_SEQ_SYNC);
1114 _EXPORT_INT(m, SNDCTL_SEQ_TESTMIDI);
1115 _EXPORT_INT(m, SNDCTL_SEQ_THRESHOLD);
1116 #ifdef SNDCTL_SYNTH_CONTROL
1117 _EXPORT_INT(m, SNDCTL_SYNTH_CONTROL);
1118 #endif
1119 #ifdef SNDCTL_SYNTH_ID
1120 _EXPORT_INT(m, SNDCTL_SYNTH_ID);
1121 #endif
1122 _EXPORT_INT(m, SNDCTL_SYNTH_INFO);
1123 _EXPORT_INT(m, SNDCTL_SYNTH_MEMAVL);
1124 #ifdef SNDCTL_SYNTH_REMOVESAMPLE
1125 _EXPORT_INT(m, SNDCTL_SYNTH_REMOVESAMPLE);
1126 #endif
1127 _EXPORT_INT(m, SNDCTL_TMR_CONTINUE);
1128 _EXPORT_INT(m, SNDCTL_TMR_METRONOME);
1129 _EXPORT_INT(m, SNDCTL_TMR_SELECT);
1130 _EXPORT_INT(m, SNDCTL_TMR_SOURCE);
1131 _EXPORT_INT(m, SNDCTL_TMR_START);
1132 _EXPORT_INT(m, SNDCTL_TMR_STOP);
1133 _EXPORT_INT(m, SNDCTL_TMR_TEMPO);
1134 _EXPORT_INT(m, SNDCTL_TMR_TIMEBASE);
1135 }
1136