1 |
/* -*- c-basic-offset: 8 -*- |
2 |
rdesktop: A Remote Desktop Protocol client. |
3 |
Sound Channel Process Functions - Open Sound System |
4 |
Copyright (C) Matthew Chapman 2003 |
5 |
Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003 |
6 |
|
7 |
This program is free software; you can redistribute it and/or modify |
8 |
it under the terms of the GNU General Public License as published by |
9 |
the Free Software Foundation; either version 2 of the License, or |
10 |
(at your option) any later version. |
11 |
|
12 |
This program is distributed in the hope that it will be useful, |
13 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 |
GNU General Public License for more details. |
16 |
|
17 |
You should have received a copy of the GNU General Public License |
18 |
along with this program; if not, write to the Free Software |
19 |
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
20 |
*/ |
21 |
|
22 |
/* |
23 |
This is a workaround for Esound bug 312665. |
24 |
FIXME: Remove this when Esound is fixed. |
25 |
*/ |
26 |
#ifdef _FILE_OFFSET_BITS |
27 |
#undef _FILE_OFFSET_BITS |
28 |
#endif |
29 |
|
30 |
#include "rdesktop.h" |
31 |
#include "rdpsnd.h" |
32 |
#include "rdpsnd_dsp.h" |
33 |
#include <unistd.h> |
34 |
#include <fcntl.h> |
35 |
#include <errno.h> |
36 |
#include <unistd.h> |
37 |
#include <sys/time.h> |
38 |
#include <sys/ioctl.h> |
39 |
#include <sys/soundcard.h> |
40 |
#include <sys/types.h> |
41 |
#include <sys/stat.h> |
42 |
|
43 |
#define DEFAULTDEVICE "/dev/dsp" |
44 |
#define MAX_LEN 512 |
45 |
|
46 |
static int dsp_fd = -1; |
47 |
static BOOL dsp_busy; |
48 |
|
49 |
static int snd_rate; |
50 |
static short samplewidth; |
51 |
static char *dsp_dev; |
52 |
static BOOL in_esddsp; |
53 |
|
54 |
/* This is a just a forward declaration */ |
55 |
static struct audio_driver oss_driver; |
56 |
|
57 |
void oss_play(void); |
58 |
|
59 |
void |
60 |
oss_add_fds(int *n, fd_set * rfds, fd_set * wfds, struct timeval *tv) |
61 |
{ |
62 |
if (dsp_fd == -1) |
63 |
return; |
64 |
|
65 |
if (rdpsnd_queue_empty()) |
66 |
return; |
67 |
|
68 |
FD_SET(dsp_fd, wfds); |
69 |
if (dsp_fd > *n) |
70 |
*n = dsp_fd; |
71 |
} |
72 |
|
73 |
void |
74 |
oss_check_fds(fd_set * rfds, fd_set * wfds) |
75 |
{ |
76 |
if (FD_ISSET(dsp_fd, wfds)) |
77 |
oss_play(); |
78 |
} |
79 |
|
80 |
static BOOL |
81 |
detect_esddsp(void) |
82 |
{ |
83 |
struct stat s; |
84 |
char *preload; |
85 |
|
86 |
if (fstat(dsp_fd, &s) == -1) |
87 |
return False; |
88 |
|
89 |
if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode)) |
90 |
return False; |
91 |
|
92 |
preload = getenv("LD_PRELOAD"); |
93 |
if (preload == NULL) |
94 |
return False; |
95 |
|
96 |
if (strstr(preload, "esddsp") == NULL) |
97 |
return False; |
98 |
|
99 |
return True; |
100 |
} |
101 |
|
102 |
BOOL |
103 |
oss_open(void) |
104 |
{ |
105 |
if ((dsp_fd = open(dsp_dev, O_WRONLY)) == -1) |
106 |
{ |
107 |
perror(dsp_dev); |
108 |
return False; |
109 |
} |
110 |
|
111 |
in_esddsp = detect_esddsp(); |
112 |
|
113 |
return True; |
114 |
} |
115 |
|
116 |
void |
117 |
oss_close(void) |
118 |
{ |
119 |
close(dsp_fd); |
120 |
dsp_fd = -1; |
121 |
dsp_busy = False; |
122 |
} |
123 |
|
124 |
BOOL |
125 |
oss_format_supported(WAVEFORMATEX * pwfx) |
126 |
{ |
127 |
if (pwfx->wFormatTag != WAVE_FORMAT_PCM) |
128 |
return False; |
129 |
if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2)) |
130 |
return False; |
131 |
if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16)) |
132 |
return False; |
133 |
|
134 |
return True; |
135 |
} |
136 |
|
137 |
BOOL |
138 |
oss_set_format(WAVEFORMATEX * pwfx) |
139 |
{ |
140 |
int stereo, format, fragments; |
141 |
static BOOL driver_broken = False; |
142 |
|
143 |
ioctl(dsp_fd, SNDCTL_DSP_RESET, NULL); |
144 |
ioctl(dsp_fd, SNDCTL_DSP_SYNC, NULL); |
145 |
|
146 |
if (pwfx->wBitsPerSample == 8) |
147 |
format = AFMT_U8; |
148 |
else if (pwfx->wBitsPerSample == 16) |
149 |
format = AFMT_S16_LE; |
150 |
|
151 |
samplewidth = pwfx->wBitsPerSample / 8; |
152 |
|
153 |
if (ioctl(dsp_fd, SNDCTL_DSP_SETFMT, &format) == -1) |
154 |
{ |
155 |
perror("SNDCTL_DSP_SETFMT"); |
156 |
oss_close(); |
157 |
return False; |
158 |
} |
159 |
|
160 |
if (pwfx->nChannels == 2) |
161 |
{ |
162 |
stereo = 1; |
163 |
samplewidth *= 2; |
164 |
} |
165 |
else |
166 |
{ |
167 |
stereo = 0; |
168 |
} |
169 |
|
170 |
if (ioctl(dsp_fd, SNDCTL_DSP_STEREO, &stereo) == -1) |
171 |
{ |
172 |
perror("SNDCTL_DSP_CHANNELS"); |
173 |
oss_close(); |
174 |
return False; |
175 |
} |
176 |
|
177 |
oss_driver.need_resampling = 0; |
178 |
snd_rate = pwfx->nSamplesPerSec; |
179 |
if (ioctl(dsp_fd, SNDCTL_DSP_SPEED, &snd_rate) == -1) |
180 |
{ |
181 |
int rates[] = { 44100, 48000, 0 }; |
182 |
int *prates = rates; |
183 |
|
184 |
while (*prates != 0) |
185 |
{ |
186 |
if ((pwfx->nSamplesPerSec != *prates) |
187 |
&& (ioctl(dsp_fd, SNDCTL_DSP_SPEED, prates) != -1)) |
188 |
{ |
189 |
oss_driver.need_resampling = 1; |
190 |
snd_rate = *prates; |
191 |
if (rdpsnd_dsp_resample_set |
192 |
(snd_rate, pwfx->wBitsPerSample, pwfx->nChannels) == False) |
193 |
{ |
194 |
error("rdpsnd_dsp_resample_set failed"); |
195 |
oss_close(); |
196 |
return False; |
197 |
} |
198 |
|
199 |
break; |
200 |
} |
201 |
prates++; |
202 |
} |
203 |
|
204 |
if (*prates == 0) |
205 |
{ |
206 |
perror("SNDCTL_DSP_SPEED"); |
207 |
oss_close(); |
208 |
return False; |
209 |
} |
210 |
} |
211 |
|
212 |
/* try to get 12 fragments of 2^12 bytes size */ |
213 |
fragments = (12 << 16) + 12; |
214 |
ioctl(dsp_fd, SNDCTL_DSP_SETFRAGMENT, &fragments); |
215 |
|
216 |
if (!driver_broken) |
217 |
{ |
218 |
audio_buf_info info; |
219 |
|
220 |
memset(&info, 0, sizeof(info)); |
221 |
if (ioctl(dsp_fd, SNDCTL_DSP_GETOSPACE, &info) == -1) |
222 |
{ |
223 |
perror("SNDCTL_DSP_GETOSPACE"); |
224 |
oss_close(); |
225 |
return False; |
226 |
} |
227 |
|
228 |
if (info.fragments == 0 || info.fragstotal == 0 || info.fragsize == 0) |
229 |
{ |
230 |
fprintf(stderr, |
231 |
"Broken OSS-driver detected: fragments: %d, fragstotal: %d, fragsize: %d\n", |
232 |
info.fragments, info.fragstotal, info.fragsize); |
233 |
driver_broken = True; |
234 |
} |
235 |
} |
236 |
|
237 |
return True; |
238 |
} |
239 |
|
240 |
void |
241 |
oss_volume(uint16 left, uint16 right) |
242 |
{ |
243 |
uint32 volume; |
244 |
|
245 |
volume = left / (65536 / 100); |
246 |
volume |= right / (65536 / 100) << 8; |
247 |
|
248 |
if (ioctl(dsp_fd, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1) |
249 |
{ |
250 |
warning("hardware volume control unavailable, falling back to software volume control!\n"); |
251 |
oss_driver.wave_out_volume = rdpsnd_dsp_softvol_set; |
252 |
rdpsnd_dsp_softvol_set(left, right); |
253 |
return; |
254 |
} |
255 |
} |
256 |
|
257 |
void |
258 |
oss_play(void) |
259 |
{ |
260 |
struct audio_packet *packet; |
261 |
ssize_t len; |
262 |
STREAM out; |
263 |
|
264 |
/* We shouldn't be called if the queue is empty, but still */ |
265 |
if (rdpsnd_queue_empty()) |
266 |
return; |
267 |
|
268 |
packet = rdpsnd_queue_current_packet(); |
269 |
out = &packet->s; |
270 |
|
271 |
len = out->end - out->p; |
272 |
|
273 |
len = write(dsp_fd, out->p, (len > MAX_LEN) ? MAX_LEN : len); |
274 |
if (len == -1) |
275 |
{ |
276 |
if (errno != EWOULDBLOCK) |
277 |
perror("write audio"); |
278 |
return; |
279 |
} |
280 |
|
281 |
out->p += len; |
282 |
|
283 |
if (out->p == out->end) |
284 |
{ |
285 |
int delay_bytes; |
286 |
unsigned long delay_us; |
287 |
audio_buf_info info; |
288 |
|
289 |
if (in_esddsp) |
290 |
{ |
291 |
/* EsounD has no way of querying buffer status, so we have to |
292 |
* go with a fixed size. */ |
293 |
delay_bytes = out->size; |
294 |
} |
295 |
else |
296 |
{ |
297 |
#ifdef SNDCTL_DSP_GETODELAY |
298 |
delay_bytes = 0; |
299 |
if (ioctl(dsp_fd, SNDCTL_DSP_GETODELAY, &delay_bytes) == -1) |
300 |
delay_bytes = -1; |
301 |
#else |
302 |
delay_bytes = -1; |
303 |
#endif |
304 |
|
305 |
if (delay_bytes == -1) |
306 |
{ |
307 |
if (ioctl(dsp_fd, SNDCTL_DSP_GETOSPACE, &info) != -1) |
308 |
delay_bytes = info.fragstotal * info.fragsize - info.bytes; |
309 |
else |
310 |
delay_bytes = out->size; |
311 |
} |
312 |
} |
313 |
|
314 |
delay_us = delay_bytes * (1000000 / (samplewidth * snd_rate)); |
315 |
rdpsnd_queue_next(delay_us); |
316 |
} |
317 |
} |
318 |
|
319 |
struct audio_driver * |
320 |
oss_register(char *options) |
321 |
{ |
322 |
oss_driver.name = xstrdup("oss"); |
323 |
oss_driver.description = |
324 |
xstrdup("OSS output driver, default device: " DEFAULTDEVICE " or $AUDIODEV"); |
325 |
|
326 |
oss_driver.add_fds = oss_add_fds; |
327 |
oss_driver.check_fds = oss_check_fds; |
328 |
|
329 |
oss_driver.wave_out_open = oss_open; |
330 |
oss_driver.wave_out_close = oss_close; |
331 |
oss_driver.wave_out_format_supported = oss_format_supported; |
332 |
oss_driver.wave_out_set_format = oss_set_format; |
333 |
oss_driver.wave_out_volume = oss_volume; |
334 |
|
335 |
oss_driver.need_byteswap_on_be = 0; |
336 |
oss_driver.need_resampling = 0; |
337 |
|
338 |
if (options) |
339 |
{ |
340 |
dsp_dev = xstrdup(options); |
341 |
} |
342 |
else |
343 |
{ |
344 |
dsp_dev = getenv("AUDIODEV"); |
345 |
|
346 |
if (dsp_dev == NULL) |
347 |
{ |
348 |
dsp_dev = xstrdup(DEFAULTDEVICE); |
349 |
} |
350 |
} |
351 |
|
352 |
return &oss_driver; |
353 |
} |