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bellard1d14ffa2005-10-30 18:58:22 +00001/*
2 * QEMU ALSA audio driver
3 *
4 * Copyright (c) 2005 Vassili Karpov (malc)
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
Markus Armbruster0b8fa322019-05-23 16:35:07 +020024
Peter Maydell6086a562016-01-18 17:33:52 +000025#include "qemu/osdep.h"
bellard1d14ffa2005-10-30 18:58:22 +000026#include <alsa/asoundlib.h>
Paolo Bonzini1de7afc2012-12-17 18:20:00 +010027#include "qemu/main-loop.h"
Markus Armbruster0b8fa322019-05-23 16:35:07 +020028#include "qemu/module.h"
pbrook749bc4b2007-11-17 17:35:54 +000029#include "audio.h"
Kővágó, Zoltánfbb7ef52015-06-12 14:33:06 +020030#include "trace.h"
bellard1d14ffa2005-10-30 18:58:22 +000031
malc26378722009-07-17 05:57:04 +040032#pragma GCC diagnostic ignored "-Waddress"
malc26378722009-07-17 05:57:04 +040033
bellard1d14ffa2005-10-30 18:58:22 +000034#define AUDIO_CAP "alsa"
35#include "audio_int.h"
36
Volker Rümelin24301182021-05-17 21:46:01 +020037#define DEBUG_ALSA 0
38
malc8b438ba2009-09-12 02:29:25 +040039struct pollhlp {
40 snd_pcm_t *handle;
41 struct pollfd *pfds;
42 int count;
malcb4f763b2009-09-14 03:53:25 +040043 int mask;
Kővágó, Zoltán18e2c172019-08-19 01:06:55 +020044 AudioState *s;
malc8b438ba2009-09-12 02:29:25 +040045};
46
bellard1d14ffa2005-10-30 18:58:22 +000047typedef struct ALSAVoiceOut {
48 HWVoiceOut hw;
bellard1d14ffa2005-10-30 18:58:22 +000049 snd_pcm_t *handle;
malc8b438ba2009-09-12 02:29:25 +040050 struct pollhlp pollhlp;
Kővágó, Zoltána93f3282019-03-08 23:34:16 +010051 Audiodev *dev;
bellard1d14ffa2005-10-30 18:58:22 +000052} ALSAVoiceOut;
53
54typedef struct ALSAVoiceIn {
55 HWVoiceIn hw;
56 snd_pcm_t *handle;
malc8b438ba2009-09-12 02:29:25 +040057 struct pollhlp pollhlp;
Kővágó, Zoltána93f3282019-03-08 23:34:16 +010058 Audiodev *dev;
bellard1d14ffa2005-10-30 18:58:22 +000059} ALSAVoiceIn;
60
bellard1d14ffa2005-10-30 18:58:22 +000061struct alsa_params_req {
balrogca9cc282008-01-14 04:24:29 +000062 int freq;
63 snd_pcm_format_t fmt;
64 int nchannels;
bellard1d14ffa2005-10-30 18:58:22 +000065};
66
67struct alsa_params_obt {
68 int freq;
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +010069 AudioFormat fmt;
balrogca9cc282008-01-14 04:24:29 +000070 int endianness;
bellard1d14ffa2005-10-30 18:58:22 +000071 int nchannels;
bellardc0fe3822005-11-05 18:55:28 +000072 snd_pcm_uframes_t samples;
bellard1d14ffa2005-10-30 18:58:22 +000073};
74
75static void GCC_FMT_ATTR (2, 3) alsa_logerr (int err, const char *fmt, ...)
76{
77 va_list ap;
78
79 va_start (ap, fmt);
80 AUD_vlog (AUDIO_CAP, fmt, ap);
81 va_end (ap);
82
83 AUD_log (AUDIO_CAP, "Reason: %s\n", snd_strerror (err));
84}
85
86static void GCC_FMT_ATTR (3, 4) alsa_logerr2 (
87 int err,
88 const char *typ,
89 const char *fmt,
90 ...
91 )
92{
93 va_list ap;
94
bellardc0fe3822005-11-05 18:55:28 +000095 AUD_log (AUDIO_CAP, "Could not initialize %s\n", typ);
bellard1d14ffa2005-10-30 18:58:22 +000096
97 va_start (ap, fmt);
98 AUD_vlog (AUDIO_CAP, fmt, ap);
99 va_end (ap);
100
101 AUD_log (AUDIO_CAP, "Reason: %s\n", snd_strerror (err));
102}
103
malc6ebfda12009-09-14 03:51:48 +0400104static void alsa_fini_poll (struct pollhlp *hlp)
105{
106 int i;
107 struct pollfd *pfds = hlp->pfds;
108
109 if (pfds) {
110 for (i = 0; i < hlp->count; ++i) {
111 qemu_set_fd_handler (pfds[i].fd, NULL, NULL, NULL);
112 }
Anthony Liguori7267c092011-08-20 22:09:37 -0500113 g_free (pfds);
malc6ebfda12009-09-14 03:51:48 +0400114 }
115 hlp->pfds = NULL;
116 hlp->count = 0;
117 hlp->handle = NULL;
118}
119
120static void alsa_anal_close1 (snd_pcm_t **handlep)
bellard1d14ffa2005-10-30 18:58:22 +0000121{
122 int err = snd_pcm_close (*handlep);
123 if (err) {
124 alsa_logerr (err, "Failed to close PCM handle %p\n", *handlep);
125 }
126 *handlep = NULL;
127}
128
malc6ebfda12009-09-14 03:51:48 +0400129static void alsa_anal_close (snd_pcm_t **handlep, struct pollhlp *hlp)
130{
131 alsa_fini_poll (hlp);
132 alsa_anal_close1 (handlep);
133}
134
malc8b438ba2009-09-12 02:29:25 +0400135static int alsa_recover (snd_pcm_t *handle)
136{
137 int err = snd_pcm_prepare (handle);
138 if (err < 0) {
139 alsa_logerr (err, "Failed to prepare handle %p\n", handle);
140 return -1;
141 }
142 return 0;
143}
144
145static int alsa_resume (snd_pcm_t *handle)
146{
147 int err = snd_pcm_resume (handle);
148 if (err < 0) {
149 alsa_logerr (err, "Failed to resume handle %p\n", handle);
150 return -1;
151 }
152 return 0;
153}
154
155static void alsa_poll_handler (void *opaque)
156{
157 int err, count;
158 snd_pcm_state_t state;
159 struct pollhlp *hlp = opaque;
160 unsigned short revents;
161
162 count = poll (hlp->pfds, hlp->count, 0);
163 if (count < 0) {
164 dolog ("alsa_poll_handler: poll %s\n", strerror (errno));
165 return;
166 }
167
168 if (!count) {
169 return;
170 }
171
172 /* XXX: ALSA example uses initial count, not the one returned by
173 poll, correct? */
174 err = snd_pcm_poll_descriptors_revents (hlp->handle, hlp->pfds,
175 hlp->count, &revents);
176 if (err < 0) {
177 alsa_logerr (err, "snd_pcm_poll_descriptors_revents");
178 return;
179 }
180
malcb4f763b2009-09-14 03:53:25 +0400181 if (!(revents & hlp->mask)) {
Kővágó, Zoltánfbb7ef52015-06-12 14:33:06 +0200182 trace_alsa_revents(revents);
malc8b438ba2009-09-12 02:29:25 +0400183 return;
184 }
185
186 state = snd_pcm_state (hlp->handle);
187 switch (state) {
malcd9812b02010-02-28 18:34:21 +0300188 case SND_PCM_STATE_SETUP:
189 alsa_recover (hlp->handle);
190 break;
191
malc8b438ba2009-09-12 02:29:25 +0400192 case SND_PCM_STATE_XRUN:
193 alsa_recover (hlp->handle);
194 break;
195
196 case SND_PCM_STATE_SUSPENDED:
197 alsa_resume (hlp->handle);
198 break;
199
200 case SND_PCM_STATE_PREPARED:
Kővágó, Zoltán18e2c172019-08-19 01:06:55 +0200201 audio_run(hlp->s, "alsa run (prepared)");
malc8b438ba2009-09-12 02:29:25 +0400202 break;
203
204 case SND_PCM_STATE_RUNNING:
Kővágó, Zoltán18e2c172019-08-19 01:06:55 +0200205 audio_run(hlp->s, "alsa run (running)");
malc8b438ba2009-09-12 02:29:25 +0400206 break;
207
208 default:
209 dolog ("Unexpected state %d\n", state);
210 }
211}
212
malcb4f763b2009-09-14 03:53:25 +0400213static int alsa_poll_helper (snd_pcm_t *handle, struct pollhlp *hlp, int mask)
malc8b438ba2009-09-12 02:29:25 +0400214{
215 int i, count, err;
216 struct pollfd *pfds;
217
218 count = snd_pcm_poll_descriptors_count (handle);
219 if (count <= 0) {
220 dolog ("Could not initialize poll mode\n"
221 "Invalid number of poll descriptors %d\n", count);
222 return -1;
223 }
224
225 pfds = audio_calloc ("alsa_poll_helper", count, sizeof (*pfds));
226 if (!pfds) {
227 dolog ("Could not initialize poll mode\n");
228 return -1;
229 }
230
231 err = snd_pcm_poll_descriptors (handle, pfds, count);
232 if (err < 0) {
233 alsa_logerr (err, "Could not initialize poll mode\n"
234 "Could not obtain poll descriptors\n");
Anthony Liguori7267c092011-08-20 22:09:37 -0500235 g_free (pfds);
malc8b438ba2009-09-12 02:29:25 +0400236 return -1;
237 }
238
239 for (i = 0; i < count; ++i) {
240 if (pfds[i].events & POLLIN) {
Fam Zhengbe93f212015-06-04 14:45:20 +0800241 qemu_set_fd_handler (pfds[i].fd, alsa_poll_handler, NULL, hlp);
malc8b438ba2009-09-12 02:29:25 +0400242 }
243 if (pfds[i].events & POLLOUT) {
Kővágó, Zoltánfbb7ef52015-06-12 14:33:06 +0200244 trace_alsa_pollout(i, pfds[i].fd);
Fam Zhengbe93f212015-06-04 14:45:20 +0800245 qemu_set_fd_handler (pfds[i].fd, NULL, alsa_poll_handler, hlp);
malc8b438ba2009-09-12 02:29:25 +0400246 }
Kővágó, Zoltánfbb7ef52015-06-12 14:33:06 +0200247 trace_alsa_set_handler(pfds[i].events, i, pfds[i].fd, err);
malc8b438ba2009-09-12 02:29:25 +0400248
malc8b438ba2009-09-12 02:29:25 +0400249 }
250 hlp->pfds = pfds;
251 hlp->count = count;
252 hlp->handle = handle;
malcb4f763b2009-09-14 03:53:25 +0400253 hlp->mask = mask;
malc8b438ba2009-09-12 02:29:25 +0400254 return 0;
255}
256
257static int alsa_poll_out (HWVoiceOut *hw)
258{
259 ALSAVoiceOut *alsa = (ALSAVoiceOut *) hw;
260
malcb4f763b2009-09-14 03:53:25 +0400261 return alsa_poll_helper (alsa->handle, &alsa->pollhlp, POLLOUT);
malc8b438ba2009-09-12 02:29:25 +0400262}
263
264static int alsa_poll_in (HWVoiceIn *hw)
265{
266 ALSAVoiceIn *alsa = (ALSAVoiceIn *) hw;
267
malcb4f763b2009-09-14 03:53:25 +0400268 return alsa_poll_helper (alsa->handle, &alsa->pollhlp, POLLIN);
malc8b438ba2009-09-12 02:29:25 +0400269}
270
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +0100271static snd_pcm_format_t aud_to_alsafmt (AudioFormat fmt, int endianness)
bellard1d14ffa2005-10-30 18:58:22 +0000272{
273 switch (fmt) {
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +0100274 case AUDIO_FORMAT_S8:
bellard1d14ffa2005-10-30 18:58:22 +0000275 return SND_PCM_FORMAT_S8;
276
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +0100277 case AUDIO_FORMAT_U8:
bellard1d14ffa2005-10-30 18:58:22 +0000278 return SND_PCM_FORMAT_U8;
279
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +0100280 case AUDIO_FORMAT_S16:
Michael Walled66bddd2011-01-08 17:53:30 +0100281 if (endianness) {
282 return SND_PCM_FORMAT_S16_BE;
Zhang Han6c6886b2021-01-15 09:24:25 +0800283 } else {
Michael Walled66bddd2011-01-08 17:53:30 +0100284 return SND_PCM_FORMAT_S16_LE;
285 }
bellard1d14ffa2005-10-30 18:58:22 +0000286
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +0100287 case AUDIO_FORMAT_U16:
Michael Walled66bddd2011-01-08 17:53:30 +0100288 if (endianness) {
289 return SND_PCM_FORMAT_U16_BE;
Zhang Han6c6886b2021-01-15 09:24:25 +0800290 } else {
Michael Walled66bddd2011-01-08 17:53:30 +0100291 return SND_PCM_FORMAT_U16_LE;
292 }
bellard1d14ffa2005-10-30 18:58:22 +0000293
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +0100294 case AUDIO_FORMAT_S32:
Michael Walled66bddd2011-01-08 17:53:30 +0100295 if (endianness) {
296 return SND_PCM_FORMAT_S32_BE;
Zhang Han6c6886b2021-01-15 09:24:25 +0800297 } else {
Michael Walled66bddd2011-01-08 17:53:30 +0100298 return SND_PCM_FORMAT_S32_LE;
299 }
thsf941aa22007-02-17 22:19:29 +0000300
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +0100301 case AUDIO_FORMAT_U32:
Michael Walled66bddd2011-01-08 17:53:30 +0100302 if (endianness) {
303 return SND_PCM_FORMAT_U32_BE;
Zhang Han6c6886b2021-01-15 09:24:25 +0800304 } else {
Michael Walled66bddd2011-01-08 17:53:30 +0100305 return SND_PCM_FORMAT_U32_LE;
306 }
thsf941aa22007-02-17 22:19:29 +0000307
Kővágó, Zoltáned2a4a72020-02-02 20:38:07 +0100308 case AUDIO_FORMAT_F32:
309 if (endianness) {
310 return SND_PCM_FORMAT_FLOAT_BE;
311 } else {
312 return SND_PCM_FORMAT_FLOAT_LE;
313 }
314
bellard1d14ffa2005-10-30 18:58:22 +0000315 default:
316 dolog ("Internal logic error: Bad audio format %d\n", fmt);
317#ifdef DEBUG_AUDIO
318 abort ();
319#endif
320 return SND_PCM_FORMAT_U8;
321 }
322}
323
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +0100324static int alsa_to_audfmt (snd_pcm_format_t alsafmt, AudioFormat *fmt,
balrogca9cc282008-01-14 04:24:29 +0000325 int *endianness)
bellard1d14ffa2005-10-30 18:58:22 +0000326{
327 switch (alsafmt) {
328 case SND_PCM_FORMAT_S8:
329 *endianness = 0;
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +0100330 *fmt = AUDIO_FORMAT_S8;
bellard1d14ffa2005-10-30 18:58:22 +0000331 break;
332
333 case SND_PCM_FORMAT_U8:
334 *endianness = 0;
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +0100335 *fmt = AUDIO_FORMAT_U8;
bellard1d14ffa2005-10-30 18:58:22 +0000336 break;
337
338 case SND_PCM_FORMAT_S16_LE:
339 *endianness = 0;
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +0100340 *fmt = AUDIO_FORMAT_S16;
bellard1d14ffa2005-10-30 18:58:22 +0000341 break;
342
343 case SND_PCM_FORMAT_U16_LE:
344 *endianness = 0;
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +0100345 *fmt = AUDIO_FORMAT_U16;
bellard1d14ffa2005-10-30 18:58:22 +0000346 break;
347
348 case SND_PCM_FORMAT_S16_BE:
349 *endianness = 1;
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +0100350 *fmt = AUDIO_FORMAT_S16;
bellard1d14ffa2005-10-30 18:58:22 +0000351 break;
352
353 case SND_PCM_FORMAT_U16_BE:
354 *endianness = 1;
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +0100355 *fmt = AUDIO_FORMAT_U16;
bellard1d14ffa2005-10-30 18:58:22 +0000356 break;
357
thsf941aa22007-02-17 22:19:29 +0000358 case SND_PCM_FORMAT_S32_LE:
359 *endianness = 0;
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +0100360 *fmt = AUDIO_FORMAT_S32;
thsf941aa22007-02-17 22:19:29 +0000361 break;
362
363 case SND_PCM_FORMAT_U32_LE:
364 *endianness = 0;
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +0100365 *fmt = AUDIO_FORMAT_U32;
thsf941aa22007-02-17 22:19:29 +0000366 break;
367
368 case SND_PCM_FORMAT_S32_BE:
369 *endianness = 1;
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +0100370 *fmt = AUDIO_FORMAT_S32;
thsf941aa22007-02-17 22:19:29 +0000371 break;
372
373 case SND_PCM_FORMAT_U32_BE:
374 *endianness = 1;
Kővágó, Zoltán85bc5852019-03-08 23:34:13 +0100375 *fmt = AUDIO_FORMAT_U32;
thsf941aa22007-02-17 22:19:29 +0000376 break;
377
Kővágó, Zoltáned2a4a72020-02-02 20:38:07 +0100378 case SND_PCM_FORMAT_FLOAT_LE:
379 *endianness = 0;
380 *fmt = AUDIO_FORMAT_F32;
381 break;
382
383 case SND_PCM_FORMAT_FLOAT_BE:
384 *endianness = 1;
385 *fmt = AUDIO_FORMAT_F32;
386 break;
387
bellard1d14ffa2005-10-30 18:58:22 +0000388 default:
389 dolog ("Unrecognized audio format %d\n", alsafmt);
390 return -1;
391 }
392
393 return 0;
394}
395
bellard1d14ffa2005-10-30 18:58:22 +0000396static void alsa_dump_info (struct alsa_params_req *req,
malc8bb414d2010-04-21 15:40:23 +0400397 struct alsa_params_obt *obt,
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100398 snd_pcm_format_t obtfmt,
399 AudiodevAlsaPerDirectionOptions *apdo)
bellard1d14ffa2005-10-30 18:58:22 +0000400{
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100401 dolog("parameter | requested value | obtained value\n");
402 dolog("format | %10d | %10d\n", req->fmt, obtfmt);
403 dolog("channels | %10d | %10d\n",
404 req->nchannels, obt->nchannels);
405 dolog("frequency | %10d | %10d\n", req->freq, obt->freq);
406 dolog("============================================\n");
407 dolog("requested: buffer len %" PRId32 " period len %" PRId32 "\n",
408 apdo->buffer_length, apdo->period_length);
409 dolog("obtained: samples %ld\n", obt->samples);
bellard1d14ffa2005-10-30 18:58:22 +0000410}
bellard1d14ffa2005-10-30 18:58:22 +0000411
412static void alsa_set_threshold (snd_pcm_t *handle, snd_pcm_uframes_t threshold)
413{
414 int err;
415 snd_pcm_sw_params_t *sw_params;
416
417 snd_pcm_sw_params_alloca (&sw_params);
418
419 err = snd_pcm_sw_params_current (handle, sw_params);
420 if (err < 0) {
bellardc0fe3822005-11-05 18:55:28 +0000421 dolog ("Could not fully initialize DAC\n");
bellard1d14ffa2005-10-30 18:58:22 +0000422 alsa_logerr (err, "Failed to get current software parameters\n");
423 return;
424 }
425
426 err = snd_pcm_sw_params_set_start_threshold (handle, sw_params, threshold);
427 if (err < 0) {
bellardc0fe3822005-11-05 18:55:28 +0000428 dolog ("Could not fully initialize DAC\n");
bellard1d14ffa2005-10-30 18:58:22 +0000429 alsa_logerr (err, "Failed to set software threshold to %ld\n",
430 threshold);
431 return;
432 }
433
434 err = snd_pcm_sw_params (handle, sw_params);
435 if (err < 0) {
bellardc0fe3822005-11-05 18:55:28 +0000436 dolog ("Could not fully initialize DAC\n");
bellard1d14ffa2005-10-30 18:58:22 +0000437 alsa_logerr (err, "Failed to set software parameters\n");
438 return;
439 }
440}
441
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100442static int alsa_open(bool in, struct alsa_params_req *req,
443 struct alsa_params_obt *obt, snd_pcm_t **handlep,
444 Audiodev *dev)
bellard1d14ffa2005-10-30 18:58:22 +0000445{
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100446 AudiodevAlsaOptions *aopts = &dev->u.alsa;
447 AudiodevAlsaPerDirectionOptions *apdo = in ? aopts->in : aopts->out;
bellard1d14ffa2005-10-30 18:58:22 +0000448 snd_pcm_t *handle;
449 snd_pcm_hw_params_t *hw_params;
ths60fe76f2007-12-16 03:02:09 +0000450 int err;
451 unsigned int freq, nchannels;
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100452 const char *pcm_name = apdo->has_dev ? apdo->dev : "default";
bellard1d14ffa2005-10-30 18:58:22 +0000453 snd_pcm_uframes_t obt_buffer_size;
454 const char *typ = in ? "ADC" : "DAC";
balrogca9cc282008-01-14 04:24:29 +0000455 snd_pcm_format_t obtfmt;
bellard1d14ffa2005-10-30 18:58:22 +0000456
457 freq = req->freq;
bellard1d14ffa2005-10-30 18:58:22 +0000458 nchannels = req->nchannels;
459
460 snd_pcm_hw_params_alloca (&hw_params);
461
462 err = snd_pcm_open (
463 &handle,
464 pcm_name,
465 in ? SND_PCM_STREAM_CAPTURE : SND_PCM_STREAM_PLAYBACK,
466 SND_PCM_NONBLOCK
467 );
468 if (err < 0) {
469 alsa_logerr2 (err, typ, "Failed to open `%s':\n", pcm_name);
470 return -1;
471 }
472
473 err = snd_pcm_hw_params_any (handle, hw_params);
474 if (err < 0) {
475 alsa_logerr2 (err, typ, "Failed to initialize hardware parameters\n");
476 goto err;
477 }
478
479 err = snd_pcm_hw_params_set_access (
480 handle,
481 hw_params,
482 SND_PCM_ACCESS_RW_INTERLEAVED
483 );
484 if (err < 0) {
485 alsa_logerr2 (err, typ, "Failed to set access type\n");
486 goto err;
487 }
488
489 err = snd_pcm_hw_params_set_format (handle, hw_params, req->fmt);
Kővágó, Zoltánfbb7ef52015-06-12 14:33:06 +0200490 if (err < 0) {
bellard1d14ffa2005-10-30 18:58:22 +0000491 alsa_logerr2 (err, typ, "Failed to set format %d\n", req->fmt);
bellard1d14ffa2005-10-30 18:58:22 +0000492 }
493
494 err = snd_pcm_hw_params_set_rate_near (handle, hw_params, &freq, 0);
495 if (err < 0) {
496 alsa_logerr2 (err, typ, "Failed to set frequency %d\n", req->freq);
497 goto err;
498 }
499
500 err = snd_pcm_hw_params_set_channels_near (
501 handle,
502 hw_params,
503 &nchannels
504 );
505 if (err < 0) {
506 alsa_logerr2 (err, typ, "Failed to set number of channels %d\n",
507 req->nchannels);
508 goto err;
509 }
510
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100511 if (apdo->buffer_length) {
512 int dir = 0;
513 unsigned int btime = apdo->buffer_length;
malcf3b52982008-06-21 20:09:32 +0000514
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100515 err = snd_pcm_hw_params_set_buffer_time_near(
516 handle, hw_params, &btime, &dir);
bellard1d14ffa2005-10-30 18:58:22 +0000517
malc7a24c802008-06-21 17:14:57 +0000518 if (err < 0) {
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100519 alsa_logerr2(err, typ, "Failed to set buffer time to %" PRId32 "\n",
520 apdo->buffer_length);
malc7a24c802008-06-21 17:14:57 +0000521 goto err;
bellard1d14ffa2005-10-30 18:58:22 +0000522 }
malcf3b52982008-06-21 20:09:32 +0000523
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100524 if (apdo->has_buffer_length && btime != apdo->buffer_length) {
525 dolog("Requested buffer time %" PRId32
526 " was rejected, using %u\n", apdo->buffer_length, btime);
527 }
bellard1d14ffa2005-10-30 18:58:22 +0000528 }
malc7a24c802008-06-21 17:14:57 +0000529
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100530 if (apdo->period_length) {
531 int dir = 0;
532 unsigned int ptime = apdo->period_length;
malcf3b52982008-06-21 20:09:32 +0000533
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100534 err = snd_pcm_hw_params_set_period_time_near(handle, hw_params, &ptime,
535 &dir);
malc7a24c802008-06-21 17:14:57 +0000536
537 if (err < 0) {
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100538 alsa_logerr2(err, typ, "Failed to set period time to %" PRId32 "\n",
539 apdo->period_length);
malc7a24c802008-06-21 17:14:57 +0000540 goto err;
541 }
malcf3b52982008-06-21 20:09:32 +0000542
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100543 if (apdo->has_period_length && ptime != apdo->period_length) {
544 dolog("Requested period time %" PRId32 " was rejected, using %d\n",
545 apdo->period_length, ptime);
546 }
bellard1d14ffa2005-10-30 18:58:22 +0000547 }
548
549 err = snd_pcm_hw_params (handle, hw_params);
550 if (err < 0) {
551 alsa_logerr2 (err, typ, "Failed to apply audio parameters\n");
552 goto err;
553 }
554
555 err = snd_pcm_hw_params_get_buffer_size (hw_params, &obt_buffer_size);
556 if (err < 0) {
557 alsa_logerr2 (err, typ, "Failed to get buffer size\n");
558 goto err;
559 }
560
balrogca9cc282008-01-14 04:24:29 +0000561 err = snd_pcm_hw_params_get_format (hw_params, &obtfmt);
562 if (err < 0) {
563 alsa_logerr2 (err, typ, "Failed to get format\n");
564 goto err;
565 }
566
567 if (alsa_to_audfmt (obtfmt, &obt->fmt, &obt->endianness)) {
568 dolog ("Invalid format was returned %d\n", obtfmt);
569 goto err;
570 }
571
bellard1d14ffa2005-10-30 18:58:22 +0000572 err = snd_pcm_prepare (handle);
573 if (err < 0) {
bellardc0fe3822005-11-05 18:55:28 +0000574 alsa_logerr2 (err, typ, "Could not prepare handle %p\n", handle);
bellard1d14ffa2005-10-30 18:58:22 +0000575 goto err;
576 }
577
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100578 if (!in && aopts->has_threshold && aopts->threshold) {
579 struct audsettings as = { .freq = freq };
580 alsa_set_threshold(
581 handle,
582 audio_buffer_frames(qapi_AudiodevAlsaPerDirectionOptions_base(apdo),
583 &as, aopts->threshold));
bellard1d14ffa2005-10-30 18:58:22 +0000584 }
585
bellard1d14ffa2005-10-30 18:58:22 +0000586 obt->nchannels = nchannels;
587 obt->freq = freq;
bellardc0fe3822005-11-05 18:55:28 +0000588 obt->samples = obt_buffer_size;
balrogca9cc282008-01-14 04:24:29 +0000589
bellard1d14ffa2005-10-30 18:58:22 +0000590 *handlep = handle;
591
Volker Rümelin24301182021-05-17 21:46:01 +0200592 if (DEBUG_ALSA || obtfmt != req->fmt ||
593 obt->nchannels != req->nchannels || obt->freq != req->freq) {
Vagrant Cascadianf093feb2010-02-26 13:39:46 -0800594 dolog ("Audio parameters for %s\n", typ);
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100595 alsa_dump_info(req, obt, obtfmt, apdo);
bellard1d14ffa2005-10-30 18:58:22 +0000596 }
597
bellard1d14ffa2005-10-30 18:58:22 +0000598 return 0;
599
600 err:
malc6ebfda12009-09-14 03:51:48 +0400601 alsa_anal_close1 (&handle);
bellard1d14ffa2005-10-30 18:58:22 +0000602 return -1;
603}
604
Kővágó, Zoltán286a5d22019-09-19 23:24:10 +0200605static size_t alsa_write(HWVoiceOut *hw, void *buf, size_t len)
bellard1d14ffa2005-10-30 18:58:22 +0000606{
607 ALSAVoiceOut *alsa = (ALSAVoiceOut *) hw;
Kővágó, Zoltán286a5d22019-09-19 23:24:10 +0200608 size_t pos = 0;
Kővágó, Zoltán2b9cce82019-10-13 21:58:02 +0200609 size_t len_frames = len / hw->info.bytes_per_frame;
bellard1d14ffa2005-10-30 18:58:22 +0000610
Kővágó, Zoltán286a5d22019-09-19 23:24:10 +0200611 while (len_frames) {
612 char *src = advance(buf, pos);
613 snd_pcm_sframes_t written;
614
615 written = snd_pcm_writei(alsa->handle, src, len_frames);
616
617 if (written <= 0) {
618 switch (written) {
619 case 0:
620 trace_alsa_wrote_zero(len_frames);
621 return pos;
622
623 case -EPIPE:
624 if (alsa_recover(alsa->handle)) {
625 alsa_logerr(written, "Failed to write %zu frames\n",
626 len_frames);
627 return pos;
628 }
629 trace_alsa_xrun_out();
630 continue;
631
632 case -ESTRPIPE:
633 /*
634 * stream is suspended and waiting for an application
635 * recovery
636 */
637 if (alsa_resume(alsa->handle)) {
638 alsa_logerr(written, "Failed to write %zu frames\n",
639 len_frames);
640 return pos;
641 }
642 trace_alsa_resume_out();
643 continue;
644
645 case -EAGAIN:
646 return pos;
647
648 default:
649 alsa_logerr(written, "Failed to write %zu frames from %p\n",
650 len, src);
651 return pos;
652 }
653 }
654
Kővágó, Zoltán2b9cce82019-10-13 21:58:02 +0200655 pos += written * hw->info.bytes_per_frame;
Kővágó, Zoltán286a5d22019-09-19 23:24:10 +0200656 if (written < len_frames) {
657 break;
658 }
659 len_frames -= written;
bellard1d14ffa2005-10-30 18:58:22 +0000660 }
661
Kővágó, Zoltán286a5d22019-09-19 23:24:10 +0200662 return pos;
bellard1d14ffa2005-10-30 18:58:22 +0000663}
664
665static void alsa_fini_out (HWVoiceOut *hw)
666{
667 ALSAVoiceOut *alsa = (ALSAVoiceOut *) hw;
668
669 ldebug ("alsa_fini\n");
malc6ebfda12009-09-14 03:51:48 +0400670 alsa_anal_close (&alsa->handle, &alsa->pollhlp);
bellard1d14ffa2005-10-30 18:58:22 +0000671}
672
Kővágó, Zoltán5706db12015-06-03 23:03:47 +0200673static int alsa_init_out(HWVoiceOut *hw, struct audsettings *as,
674 void *drv_opaque)
bellard1d14ffa2005-10-30 18:58:22 +0000675{
676 ALSAVoiceOut *alsa = (ALSAVoiceOut *) hw;
677 struct alsa_params_req req;
678 struct alsa_params_obt obt;
bellard1d14ffa2005-10-30 18:58:22 +0000679 snd_pcm_t *handle;
malc1ea879e2008-12-03 22:48:44 +0000680 struct audsettings obt_as;
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100681 Audiodev *dev = drv_opaque;
bellard1d14ffa2005-10-30 18:58:22 +0000682
Michael Walled66bddd2011-01-08 17:53:30 +0100683 req.fmt = aud_to_alsafmt (as->fmt, as->endianness);
bellardc0fe3822005-11-05 18:55:28 +0000684 req.freq = as->freq;
685 req.nchannels = as->nchannels;
bellard1d14ffa2005-10-30 18:58:22 +0000686
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100687 if (alsa_open(0, &req, &obt, &handle, dev)) {
bellard1d14ffa2005-10-30 18:58:22 +0000688 return -1;
689 }
690
bellardc0fe3822005-11-05 18:55:28 +0000691 obt_as.freq = obt.freq;
692 obt_as.nchannels = obt.nchannels;
balrogca9cc282008-01-14 04:24:29 +0000693 obt_as.fmt = obt.fmt;
694 obt_as.endianness = obt.endianness;
bellardc0fe3822005-11-05 18:55:28 +0000695
bellardd929eba2006-07-04 21:47:22 +0000696 audio_pcm_init_info (&hw->info, &obt_as);
bellardc0fe3822005-11-05 18:55:28 +0000697 hw->samples = obt.samples;
bellard1d14ffa2005-10-30 18:58:22 +0000698
Kővágó, Zoltán18e2c172019-08-19 01:06:55 +0200699 alsa->pollhlp.s = hw->s;
bellard1d14ffa2005-10-30 18:58:22 +0000700 alsa->handle = handle;
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100701 alsa->dev = dev;
bellard571ec3d2005-11-20 16:24:34 +0000702 return 0;
703}
704
Jindrich Makovicka38cc9b62010-10-17 20:17:19 +0200705#define VOICE_CTL_PAUSE 0
706#define VOICE_CTL_PREPARE 1
707#define VOICE_CTL_START 2
708
709static int alsa_voice_ctl (snd_pcm_t *handle, const char *typ, int ctl)
bellard571ec3d2005-11-20 16:24:34 +0000710{
711 int err;
712
Jindrich Makovicka38cc9b62010-10-17 20:17:19 +0200713 if (ctl == VOICE_CTL_PAUSE) {
bellard571ec3d2005-11-20 16:24:34 +0000714 err = snd_pcm_drop (handle);
715 if (err < 0) {
bellard32d448c2005-11-20 18:53:05 +0000716 alsa_logerr (err, "Could not stop %s\n", typ);
bellard571ec3d2005-11-20 16:24:34 +0000717 return -1;
718 }
Zhang Han6c6886b2021-01-15 09:24:25 +0800719 } else {
bellard571ec3d2005-11-20 16:24:34 +0000720 err = snd_pcm_prepare (handle);
721 if (err < 0) {
bellard32d448c2005-11-20 18:53:05 +0000722 alsa_logerr (err, "Could not prepare handle for %s\n", typ);
bellard571ec3d2005-11-20 16:24:34 +0000723 return -1;
724 }
Jindrich Makovicka38cc9b62010-10-17 20:17:19 +0200725 if (ctl == VOICE_CTL_START) {
726 err = snd_pcm_start(handle);
727 if (err < 0) {
728 alsa_logerr (err, "Could not start handle for %s\n", typ);
729 return -1;
730 }
731 }
bellard571ec3d2005-11-20 16:24:34 +0000732 }
733
bellard1d14ffa2005-10-30 18:58:22 +0000734 return 0;
735}
736
Kővágó, Zoltán571a8c52019-09-19 23:24:22 +0200737static void alsa_enable_out(HWVoiceOut *hw, bool enable)
bellard1d14ffa2005-10-30 18:58:22 +0000738{
bellard1d14ffa2005-10-30 18:58:22 +0000739 ALSAVoiceOut *alsa = (ALSAVoiceOut *) hw;
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100740 AudiodevAlsaPerDirectionOptions *apdo = alsa->dev->u.alsa.out;
bellard1d14ffa2005-10-30 18:58:22 +0000741
Kővágó, Zoltán571a8c52019-09-19 23:24:22 +0200742 if (enable) {
743 bool poll_mode = apdo->try_poll;
malc301901b2009-10-02 02:37:40 +0400744
Kővágó, Zoltán571a8c52019-09-19 23:24:22 +0200745 ldebug("enabling voice\n");
746 if (poll_mode && alsa_poll_out(hw)) {
747 poll_mode = 0;
malc8b438ba2009-09-12 02:29:25 +0400748 }
Kővágó, Zoltán571a8c52019-09-19 23:24:22 +0200749 hw->poll_mode = poll_mode;
750 alsa_voice_ctl(alsa->handle, "playback", VOICE_CTL_PREPARE);
751 } else {
752 ldebug("disabling voice\n");
Jindrich Makovicka22d948a2010-10-17 19:28:14 +0200753 if (hw->poll_mode) {
754 hw->poll_mode = 0;
Kővágó, Zoltán571a8c52019-09-19 23:24:22 +0200755 alsa_fini_poll(&alsa->pollhlp);
Jindrich Makovicka22d948a2010-10-17 19:28:14 +0200756 }
Kővágó, Zoltán571a8c52019-09-19 23:24:22 +0200757 alsa_voice_ctl(alsa->handle, "playback", VOICE_CTL_PAUSE);
bellard1d14ffa2005-10-30 18:58:22 +0000758 }
bellard1d14ffa2005-10-30 18:58:22 +0000759}
760
Kővágó, Zoltán5706db12015-06-03 23:03:47 +0200761static int alsa_init_in(HWVoiceIn *hw, struct audsettings *as, void *drv_opaque)
bellard1d14ffa2005-10-30 18:58:22 +0000762{
763 ALSAVoiceIn *alsa = (ALSAVoiceIn *) hw;
764 struct alsa_params_req req;
765 struct alsa_params_obt obt;
bellard1d14ffa2005-10-30 18:58:22 +0000766 snd_pcm_t *handle;
malc1ea879e2008-12-03 22:48:44 +0000767 struct audsettings obt_as;
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100768 Audiodev *dev = drv_opaque;
bellard1d14ffa2005-10-30 18:58:22 +0000769
Michael Walled66bddd2011-01-08 17:53:30 +0100770 req.fmt = aud_to_alsafmt (as->fmt, as->endianness);
bellardc0fe3822005-11-05 18:55:28 +0000771 req.freq = as->freq;
772 req.nchannels = as->nchannels;
bellard1d14ffa2005-10-30 18:58:22 +0000773
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100774 if (alsa_open(1, &req, &obt, &handle, dev)) {
bellard1d14ffa2005-10-30 18:58:22 +0000775 return -1;
776 }
777
bellardc0fe3822005-11-05 18:55:28 +0000778 obt_as.freq = obt.freq;
779 obt_as.nchannels = obt.nchannels;
balrogca9cc282008-01-14 04:24:29 +0000780 obt_as.fmt = obt.fmt;
781 obt_as.endianness = obt.endianness;
bellardc0fe3822005-11-05 18:55:28 +0000782
bellardd929eba2006-07-04 21:47:22 +0000783 audio_pcm_init_info (&hw->info, &obt_as);
bellardc0fe3822005-11-05 18:55:28 +0000784 hw->samples = obt.samples;
785
Kővágó, Zoltán18e2c172019-08-19 01:06:55 +0200786 alsa->pollhlp.s = hw->s;
bellard1d14ffa2005-10-30 18:58:22 +0000787 alsa->handle = handle;
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100788 alsa->dev = dev;
bellard1d14ffa2005-10-30 18:58:22 +0000789 return 0;
790}
791
792static void alsa_fini_in (HWVoiceIn *hw)
793{
794 ALSAVoiceIn *alsa = (ALSAVoiceIn *) hw;
795
malc6ebfda12009-09-14 03:51:48 +0400796 alsa_anal_close (&alsa->handle, &alsa->pollhlp);
bellard1d14ffa2005-10-30 18:58:22 +0000797}
798
Kővágó, Zoltán286a5d22019-09-19 23:24:10 +0200799static size_t alsa_read(HWVoiceIn *hw, void *buf, size_t len)
bellard1d14ffa2005-10-30 18:58:22 +0000800{
801 ALSAVoiceIn *alsa = (ALSAVoiceIn *) hw;
Kővágó, Zoltán286a5d22019-09-19 23:24:10 +0200802 size_t pos = 0;
bellard1d14ffa2005-10-30 18:58:22 +0000803
Kővágó, Zoltán286a5d22019-09-19 23:24:10 +0200804 while (len) {
805 void *dst = advance(buf, pos);
bellard1d14ffa2005-10-30 18:58:22 +0000806 snd_pcm_sframes_t nread;
bellard1d14ffa2005-10-30 18:58:22 +0000807
Kővágó, Zoltán2b9cce82019-10-13 21:58:02 +0200808 nread = snd_pcm_readi(
809 alsa->handle, dst, len / hw->info.bytes_per_frame);
bellard1d14ffa2005-10-30 18:58:22 +0000810
Kővágó, Zoltán286a5d22019-09-19 23:24:10 +0200811 if (nread <= 0) {
812 switch (nread) {
813 case 0:
814 trace_alsa_read_zero(len);
Philippe Mathieu-Daudé3a1bdd12020-02-18 10:43:51 +0100815 return pos;
bellard1d14ffa2005-10-30 18:58:22 +0000816
Kővágó, Zoltán286a5d22019-09-19 23:24:10 +0200817 case -EPIPE:
818 if (alsa_recover(alsa->handle)) {
819 alsa_logerr(nread, "Failed to read %zu frames\n", len);
820 return pos;
bellard1d14ffa2005-10-30 18:58:22 +0000821 }
Kővágó, Zoltán286a5d22019-09-19 23:24:10 +0200822 trace_alsa_xrun_in();
823 continue;
824
825 case -EAGAIN:
826 return pos;
827
828 default:
829 alsa_logerr(nread, "Failed to read %zu frames to %p\n",
830 len, dst);
Philippe Mathieu-Daudé3a1bdd12020-02-18 10:43:51 +0100831 return pos;
bellard1d14ffa2005-10-30 18:58:22 +0000832 }
bellard1d14ffa2005-10-30 18:58:22 +0000833 }
Kővágó, Zoltán286a5d22019-09-19 23:24:10 +0200834
Kővágó, Zoltán2b9cce82019-10-13 21:58:02 +0200835 pos += nread * hw->info.bytes_per_frame;
836 len -= nread * hw->info.bytes_per_frame;
bellard1d14ffa2005-10-30 18:58:22 +0000837 }
838
Kővágó, Zoltán286a5d22019-09-19 23:24:10 +0200839 return pos;
bellard1d14ffa2005-10-30 18:58:22 +0000840}
841
Kővágó, Zoltán571a8c52019-09-19 23:24:22 +0200842static void alsa_enable_in(HWVoiceIn *hw, bool enable)
bellard1d14ffa2005-10-30 18:58:22 +0000843{
bellard571ec3d2005-11-20 16:24:34 +0000844 ALSAVoiceIn *alsa = (ALSAVoiceIn *) hw;
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100845 AudiodevAlsaPerDirectionOptions *apdo = alsa->dev->u.alsa.in;
bellard571ec3d2005-11-20 16:24:34 +0000846
Kővágó, Zoltán571a8c52019-09-19 23:24:22 +0200847 if (enable) {
848 bool poll_mode = apdo->try_poll;
malca628b862009-10-03 03:30:06 +0400849
Kővágó, Zoltán571a8c52019-09-19 23:24:22 +0200850 ldebug("enabling voice\n");
851 if (poll_mode && alsa_poll_in(hw)) {
852 poll_mode = 0;
malca628b862009-10-03 03:30:06 +0400853 }
Kővágó, Zoltán571a8c52019-09-19 23:24:22 +0200854 hw->poll_mode = poll_mode;
bellard571ec3d2005-11-20 16:24:34 +0000855
Kővágó, Zoltán571a8c52019-09-19 23:24:22 +0200856 alsa_voice_ctl(alsa->handle, "capture", VOICE_CTL_START);
857 } else {
bellard571ec3d2005-11-20 16:24:34 +0000858 ldebug ("disabling voice\n");
malc8b438ba2009-09-12 02:29:25 +0400859 if (hw->poll_mode) {
860 hw->poll_mode = 0;
Kővágó, Zoltán571a8c52019-09-19 23:24:22 +0200861 alsa_fini_poll(&alsa->pollhlp);
malc8b438ba2009-09-12 02:29:25 +0400862 }
Kővágó, Zoltán571a8c52019-09-19 23:24:22 +0200863 alsa_voice_ctl(alsa->handle, "capture", VOICE_CTL_PAUSE);
bellard571ec3d2005-11-20 16:24:34 +0000864 }
bellard1d14ffa2005-10-30 18:58:22 +0000865}
866
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100867static void alsa_init_per_direction(AudiodevAlsaPerDirectionOptions *apdo)
868{
869 if (!apdo->has_try_poll) {
870 apdo->try_poll = true;
871 apdo->has_try_poll = true;
872 }
873}
Kővágó, Zoltán765b37d2015-06-03 23:03:48 +0200874
Kővágó, Zoltán71830222019-03-08 23:34:15 +0100875static void *alsa_audio_init(Audiodev *dev)
bellard1d14ffa2005-10-30 18:58:22 +0000876{
Kővágó, Zoltána93f3282019-03-08 23:34:16 +0100877 AudiodevAlsaOptions *aopts;
878 assert(dev->driver == AUDIODEV_DRIVER_ALSA);
879
880 aopts = &dev->u.alsa;
881 alsa_init_per_direction(aopts->in);
882 alsa_init_per_direction(aopts->out);
883
884 /*
885 * need to define them, as otherwise alsa produces no sound
886 * doesn't set has_* so alsa_open can identify it wasn't set by the user
887 */
888 if (!dev->u.alsa.out->has_period_length) {
889 /* 1024 frames assuming 44100Hz */
890 dev->u.alsa.out->period_length = 1024 * 1000000 / 44100;
891 }
892 if (!dev->u.alsa.out->has_buffer_length) {
893 /* 4096 frames assuming 44100Hz */
894 dev->u.alsa.out->buffer_length = 4096ll * 1000000 / 44100;
895 }
896
897 /*
898 * OptsVisitor sets unspecified optional fields to zero, but do not depend
899 * on it...
900 */
901 if (!dev->u.alsa.in->has_period_length) {
902 dev->u.alsa.in->period_length = 0;
903 }
904 if (!dev->u.alsa.in->has_buffer_length) {
905 dev->u.alsa.in->buffer_length = 0;
906 }
907
908 return dev;
bellard1d14ffa2005-10-30 18:58:22 +0000909}
910
911static void alsa_audio_fini (void *opaque)
912{
bellard1d14ffa2005-10-30 18:58:22 +0000913}
914
blueswir135f4b582008-10-06 18:08:30 +0000915static struct audio_pcm_ops alsa_pcm_ops = {
Juan Quintela1dd3e4d2009-08-11 02:31:15 +0200916 .init_out = alsa_init_out,
917 .fini_out = alsa_fini_out,
Kővágó, Zoltán286a5d22019-09-19 23:24:10 +0200918 .write = alsa_write,
Volker Rümelinfdc8c5f2020-01-23 08:49:39 +0100919 .run_buffer_out = audio_generic_run_buffer_out,
Kővágó, Zoltán571a8c52019-09-19 23:24:22 +0200920 .enable_out = alsa_enable_out,
bellard1d14ffa2005-10-30 18:58:22 +0000921
Juan Quintela1dd3e4d2009-08-11 02:31:15 +0200922 .init_in = alsa_init_in,
923 .fini_in = alsa_fini_in,
Kővágó, Zoltán286a5d22019-09-19 23:24:10 +0200924 .read = alsa_read,
Volker Rümelina2893c82021-01-10 11:02:24 +0100925 .run_buffer_in = audio_generic_run_buffer_in,
Kővágó, Zoltán571a8c52019-09-19 23:24:22 +0200926 .enable_in = alsa_enable_in,
bellard1d14ffa2005-10-30 18:58:22 +0000927};
928
Gerd Hoffmannd3893a32018-03-06 08:40:47 +0100929static struct audio_driver alsa_audio_driver = {
Juan Quintelabee37f32009-08-11 02:31:14 +0200930 .name = "alsa",
931 .descr = "ALSA http://www.alsa-project.org",
Juan Quintelabee37f32009-08-11 02:31:14 +0200932 .init = alsa_audio_init,
933 .fini = alsa_audio_fini,
934 .pcm_ops = &alsa_pcm_ops,
935 .can_be_default = 1,
936 .max_voices_out = INT_MAX,
937 .max_voices_in = INT_MAX,
938 .voice_size_out = sizeof (ALSAVoiceOut),
939 .voice_size_in = sizeof (ALSAVoiceIn)
bellard1d14ffa2005-10-30 18:58:22 +0000940};
Gerd Hoffmannd3893a32018-03-06 08:40:47 +0100941
942static void register_audio_alsa(void)
943{
944 audio_driver_register(&alsa_audio_driver);
945}
946type_init(register_audio_alsa);