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source: vbox/trunk/src/VBox/RDP/client/rdpsnd_alsa.c@ 9902

最後變更 在這個檔案從9902是 9902,由 vboxsync 提交於 16 年 前

Added rdesktop 1.6.0.
  • 屬性 svn:eol-style 設為 native
  • 屬性 svn:keywords 設為 Author Date Id Revision
檔案大小: 11.0 KB
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1/* -*- c-basic-offset: 8 -*-
2 rdesktop: A Remote Desktop Protocol client.
3 Sound Channel Process Functions - alsa-driver
4 Copyright (C) Matthew Chapman 2003-2007
5 Copyright (C) GuoJunBo [email protected] 2003
6 Copyright (C) Michael Gernoth [email protected] 2006-2007
7 Copyright 2006-2007 Pierre Ossman <[email protected]> for Cendio AB
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22*/
23
24#include "rdesktop.h"
25#include "rdpsnd.h"
26#include "rdpsnd_dsp.h"
27#include <unistd.h>
28#include <fcntl.h>
29#include <errno.h>
30#include <alsa/asoundlib.h>
31#include <sys/time.h>
32
33#define DEFAULTDEVICE "default"
34#define MAX_FRAMES 32
35
36static struct pollfd pfds_out[32];
37static int num_fds_out;
38
39static struct pollfd pfds_in[32];
40static int num_fds_in;
41
42static snd_pcm_t *out_handle = NULL;
43static snd_pcm_t *in_handle = NULL;
44
45static RD_BOOL reopened;
46
47static short samplewidth_out;
48static int audiochannels_out;
49static unsigned int rate_out;
50
51static short samplewidth_in;
52static int audiochannels_in;
53static unsigned int rate_in;
54
55static char *pcm_name;
56
57void alsa_play(void);
58void alsa_record(void);
59
60void
61alsa_add_fds(int *n, fd_set * rfds, fd_set * wfds, struct timeval *tv)
62{
63 int err;
64 struct pollfd *f;
65
66 if (out_handle && !rdpsnd_queue_empty())
67 {
68 num_fds_out = snd_pcm_poll_descriptors_count(out_handle);
69
70 if (num_fds_out > sizeof(pfds_out) / sizeof(*pfds_out))
71 return;
72
73 err = snd_pcm_poll_descriptors(out_handle, pfds_out, num_fds_out);
74 if (err < 0)
75 return;
76
77 for (f = pfds_out; f < &pfds_out[num_fds_out]; f++)
78 {
79 if (f->events & POLLIN)
80 FD_SET(f->fd, rfds);
81 if (f->events & POLLOUT)
82 FD_SET(f->fd, wfds);
83 if (f->fd > *n && (f->events & (POLLIN | POLLOUT)))
84 *n = f->fd;
85 }
86 }
87
88 if (in_handle)
89 {
90 num_fds_in = snd_pcm_poll_descriptors_count(in_handle);
91
92 if (num_fds_in > sizeof(pfds_in) / sizeof(*pfds_in))
93 return;
94
95 err = snd_pcm_poll_descriptors(in_handle, pfds_in, num_fds_in);
96 if (err < 0)
97 return;
98
99 for (f = pfds_in; f < &pfds_in[num_fds_in]; f++)
100 {
101 if (f->events & POLLIN)
102 FD_SET(f->fd, rfds);
103 if (f->events & POLLOUT)
104 FD_SET(f->fd, wfds);
105 if (f->fd > *n && (f->events & (POLLIN | POLLOUT)))
106 *n = f->fd;
107 }
108 }
109}
110
111void
112alsa_check_fds(fd_set * rfds, fd_set * wfds)
113{
114 struct pollfd *f;
115 int err;
116 unsigned short revents;
117
118 if (out_handle && !rdpsnd_queue_empty())
119 {
120 for (f = pfds_out; f < &pfds_out[num_fds_out]; f++)
121 {
122 f->revents = 0;
123 if (f->fd != -1)
124 {
125 /* Fixme: This doesn't properly deal with things like POLLHUP */
126 if (FD_ISSET(f->fd, rfds))
127 f->revents |= POLLIN;
128 if (FD_ISSET(f->fd, wfds))
129 f->revents |= POLLOUT;
130 }
131 }
132
133 err = snd_pcm_poll_descriptors_revents(out_handle, pfds_out, num_fds_out, &revents);
134 if (err < 0)
135 return;
136
137 if (revents & POLLOUT)
138 alsa_play();
139 }
140
141
142 if (in_handle)
143 {
144 for (f = pfds_in; f < &pfds_in[num_fds_in]; f++)
145 {
146 f->revents = 0;
147 if (f->fd != -1)
148 {
149 /* Fixme: This doesn't properly deal with things like POLLHUP */
150 if (FD_ISSET(f->fd, rfds))
151 f->revents |= POLLIN;
152 if (FD_ISSET(f->fd, wfds))
153 f->revents |= POLLOUT;
154 }
155 }
156
157 err = snd_pcm_poll_descriptors_revents(in_handle, pfds_in, num_fds_in, &revents);
158 if (err < 0)
159 return;
160
161 if (revents & POLLIN)
162 alsa_record();
163 }
164}
165
166static RD_BOOL
167alsa_set_format(snd_pcm_t * pcm, RD_WAVEFORMATEX * pwfx)
168{
169 snd_pcm_hw_params_t *hwparams = NULL;
170 int err;
171 unsigned int buffertime;
172 short samplewidth;
173 int audiochannels;
174 unsigned int rate;
175
176 samplewidth = pwfx->wBitsPerSample / 8;
177
178 if ((err = snd_pcm_hw_params_malloc(&hwparams)) < 0)
179 {
180 error("snd_pcm_hw_params_malloc: %s\n", snd_strerror(err));
181 return False;
182 }
183
184 if ((err = snd_pcm_hw_params_any(pcm, hwparams)) < 0)
185 {
186 error("snd_pcm_hw_params_any: %s\n", snd_strerror(err));
187 return False;
188 }
189
190 if ((err = snd_pcm_hw_params_set_access(pcm, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
191 {
192 error("snd_pcm_hw_params_set_access: %s\n", snd_strerror(err));
193 return False;
194 }
195
196 if (pwfx->wBitsPerSample == 16)
197 {
198 if ((err = snd_pcm_hw_params_set_format(pcm, hwparams, SND_PCM_FORMAT_S16_LE)) < 0)
199 {
200 error("snd_pcm_hw_params_set_format: %s\n", snd_strerror(err));
201 return False;
202 }
203 }
204 else
205 {
206 if ((err = snd_pcm_hw_params_set_format(pcm, hwparams, SND_PCM_FORMAT_S8)) < 0)
207 {
208 error("snd_pcm_hw_params_set_format: %s\n", snd_strerror(err));
209 return False;
210 }
211 }
212
213#if 0
214 if ((err = snd_pcm_hw_params_set_rate_resample(pcm, hwparams, 1)) < 0)
215 {
216 error("snd_pcm_hw_params_set_rate_resample: %s\n", snd_strerror(err));
217 return False;
218 }
219#endif
220
221 rate = pwfx->nSamplesPerSec;
222 if ((err = snd_pcm_hw_params_set_rate_near(pcm, hwparams, &rate, 0)) < 0)
223 {
224 error("snd_pcm_hw_params_set_rate_near: %s\n", snd_strerror(err));
225 return False;
226 }
227
228 audiochannels = pwfx->nChannels;
229 if ((err = snd_pcm_hw_params_set_channels(pcm, hwparams, pwfx->nChannels)) < 0)
230 {
231 error("snd_pcm_hw_params_set_channels: %s\n", snd_strerror(err));
232 return False;
233 }
234
235
236 buffertime = 500000; /* microseconds */
237 if ((err = snd_pcm_hw_params_set_buffer_time_near(pcm, hwparams, &buffertime, 0)) < 0)
238 {
239 error("snd_pcm_hw_params_set_buffer_time_near: %s\n", snd_strerror(err));
240 return False;
241 }
242
243 if ((err = snd_pcm_hw_params(pcm, hwparams)) < 0)
244 {
245 error("snd_pcm_hw_params: %s\n", snd_strerror(err));
246 return False;
247 }
248
249 snd_pcm_hw_params_free(hwparams);
250
251 if ((err = snd_pcm_prepare(pcm)) < 0)
252 {
253 error("snd_pcm_prepare: %s\n", snd_strerror(err));
254 return False;
255 }
256
257 reopened = True;
258
259 return True;
260}
261
262RD_BOOL
263alsa_open_out(void)
264{
265 int err;
266
267 if ((err = snd_pcm_open(&out_handle, pcm_name, SND_PCM_STREAM_PLAYBACK, 0)) < 0)
268 {
269 error("snd_pcm_open: %s\n", snd_strerror(err));
270 return False;
271 }
272
273 reopened = True;
274
275 return True;
276}
277
278void
279alsa_close_out(void)
280{
281 /* Ack all remaining packets */
282 while (!rdpsnd_queue_empty())
283 rdpsnd_queue_next(0);
284
285 if (out_handle)
286 {
287 snd_pcm_close(out_handle);
288 out_handle = NULL;
289 }
290}
291
292RD_BOOL
293alsa_format_supported(RD_WAVEFORMATEX * pwfx)
294{
295#if 0
296 int err;
297 snd_pcm_hw_params_t *hwparams = NULL;
298
299 if ((err = snd_pcm_hw_params_malloc(&hwparams)) < 0)
300 {
301 error("snd_pcm_hw_params_malloc: %s\n", snd_strerror(err));
302 return False;
303 }
304
305 if ((err = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0)
306 {
307 error("snd_pcm_hw_params_malloc: %s\n", snd_strerror(err));
308 return False;
309 }
310 snd_pcm_hw_params_free(hwparams);
311#endif
312
313 if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
314 return False;
315 if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))
316 return False;
317 if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))
318 return False;
319 if ((pwfx->nSamplesPerSec != 44100) && (pwfx->nSamplesPerSec != 22050))
320 return False;
321
322 return True;
323}
324
325RD_BOOL
326alsa_set_format_out(RD_WAVEFORMATEX * pwfx)
327{
328 if (!alsa_set_format(out_handle, pwfx))
329 return False;
330
331 samplewidth_out = pwfx->wBitsPerSample / 8;
332 audiochannels_out = pwfx->nChannels;
333 rate_out = pwfx->nSamplesPerSec;
334
335 return True;
336}
337
338void
339alsa_play(void)
340{
341 struct audio_packet *packet;
342 STREAM out;
343 int len;
344 static long prev_s, prev_us;
345 unsigned int duration;
346 struct timeval tv;
347 int next_tick;
348
349 if (reopened)
350 {
351 reopened = False;
352 gettimeofday(&tv, NULL);
353 prev_s = tv.tv_sec;
354 prev_us = tv.tv_usec;
355 }
356
357 /* We shouldn't be called if the queue is empty, but still */
358 if (rdpsnd_queue_empty())
359 return;
360
361 packet = rdpsnd_queue_current_packet();
362 out = &packet->s;
363
364 next_tick = rdpsnd_queue_next_tick();
365
366 len = (out->end - out->p) / (samplewidth_out * audiochannels_out);
367 if ((len = snd_pcm_writei(out_handle, out->p, ((MAX_FRAMES < len) ? MAX_FRAMES : len))) < 0)
368 {
369 printf("Fooo!\n");
370 snd_pcm_prepare(out_handle);
371 len = 0;
372 }
373 out->p += (len * samplewidth_out * audiochannels_out);
374
375 gettimeofday(&tv, NULL);
376
377 duration = ((tv.tv_sec - prev_s) * 1000000 + (tv.tv_usec - prev_us)) / 1000;
378
379 if (packet->tick > next_tick)
380 next_tick += 65536;
381
382 if ((out->p == out->end) || duration > next_tick - packet->tick + 500)
383 {
384 snd_pcm_sframes_t delay_frames;
385 unsigned long delay_us;
386
387 prev_s = tv.tv_sec;
388 prev_us = tv.tv_usec;
389
390 if (abs((next_tick - packet->tick) - duration) > 20)
391 {
392 DEBUG(("duration: %d, calc: %d, ", duration, next_tick - packet->tick));
393 DEBUG(("last: %d, is: %d, should: %d\n", packet->tick,
394 (packet->tick + duration) % 65536, next_tick % 65536));
395 }
396
397 if (snd_pcm_delay(out_handle, &delay_frames) < 0)
398 delay_frames = out->size / (samplewidth_out * audiochannels_out);
399 if (delay_frames < 0)
400 delay_frames = 0;
401
402 delay_us = delay_frames * (1000000 / rate_out);
403
404 rdpsnd_queue_next(delay_us);
405 }
406}
407
408RD_BOOL
409alsa_open_in(void)
410{
411 int err;
412
413 if ((err =
414 snd_pcm_open(&in_handle, pcm_name, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK)) < 0)
415 {
416 error("snd_pcm_open: %s\n", snd_strerror(err));
417 return False;
418 }
419
420 return True;
421}
422
423void
424alsa_close_in(void)
425{
426 if (in_handle)
427 {
428 snd_pcm_close(in_handle);
429 in_handle = NULL;
430 }
431}
432
433RD_BOOL
434alsa_set_format_in(RD_WAVEFORMATEX * pwfx)
435{
436 int err;
437
438 if (!alsa_set_format(in_handle, pwfx))
439 return False;
440
441 if ((err = snd_pcm_start(in_handle)) < 0)
442 {
443 error("snd_pcm_start: %s\n", snd_strerror(err));
444 return False;
445 }
446
447 samplewidth_in = pwfx->wBitsPerSample / 8;
448 audiochannels_in = pwfx->nChannels;
449 rate_in = pwfx->nSamplesPerSec;
450
451 return True;
452}
453
454void
455alsa_record(void)
456{
457 int len;
458 char buffer[32768];
459
460 len = snd_pcm_readi(in_handle, buffer,
461 sizeof(buffer) / (samplewidth_in * audiochannels_in));
462 if (len < 0)
463 {
464 snd_pcm_prepare(in_handle);
465 len = 0;
466 }
467
468 rdpsnd_record(buffer, len * samplewidth_in * audiochannels_in);
469}
470
471struct audio_driver *
472alsa_register(char *options)
473{
474 static struct audio_driver alsa_driver;
475
476 memset(&alsa_driver, 0, sizeof(alsa_driver));
477
478 alsa_driver.name = "alsa";
479 alsa_driver.description = "ALSA output driver, default device: " DEFAULTDEVICE;
480
481 alsa_driver.add_fds = alsa_add_fds;
482 alsa_driver.check_fds = alsa_check_fds;
483
484 alsa_driver.wave_out_open = alsa_open_out;
485 alsa_driver.wave_out_close = alsa_close_out;
486 alsa_driver.wave_out_format_supported = alsa_format_supported;
487 alsa_driver.wave_out_set_format = alsa_set_format_out;
488 alsa_driver.wave_out_volume = rdpsnd_dsp_softvol_set;
489
490 alsa_driver.wave_in_open = alsa_open_in;
491 alsa_driver.wave_in_close = alsa_close_in;
492 alsa_driver.wave_in_format_supported = alsa_format_supported;
493 alsa_driver.wave_in_set_format = alsa_set_format_in;
494 alsa_driver.wave_in_volume = NULL; /* FIXME */
495
496 alsa_driver.need_byteswap_on_be = 0;
497 alsa_driver.need_resampling = 0;
498
499 if (options)
500 {
501 pcm_name = xstrdup(options);
502 }
503 else
504 {
505 pcm_name = DEFAULTDEVICE;
506 }
507
508 return &alsa_driver;
509}
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