trunk/rdesktop/rdpsnd_oss.c

/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.
   Sound Channel Process Functions - Open Sound System
   Copyright (C) Matthew Chapman 2003-2008
   Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003
   Copyright 2006-2008 Pierre Ossman <ossman@cendio.se> for Cendio AB

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/* 
   This is a workaround for Esound bug 312665. 
   FIXME: Remove this when Esound is fixed. 
*/
#ifdef _FILE_OFFSET_BITS
#undef _FILE_OFFSET_BITS
#endif

#include "rdesktop.h"
#include "rdpsnd.h"
#include "rdpsnd_dsp.h"
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#include <sys/types.h>
#include <sys/stat.h>

#define DEFAULTDEVICE   "/dev/dsp"
#define MAX_LEN         512

static int dsp_fd = -1;
static int dsp_mode;
static int dsp_refs;

static RD_BOOL dsp_configured;
static RD_BOOL dsp_broken;

static RD_BOOL dsp_out;
static RD_BOOL dsp_in;

static int stereo;
static int format;
static uint32 snd_rate;
static short samplewidth;
static char *dsp_dev;
static RD_BOOL in_esddsp;

/* This is a just a forward declaration */
static struct audio_driver oss_driver;

void oss_play(void);
void oss_record(void);

void
oss_add_fds(int *n, fd_set * rfds, fd_set * wfds, struct timeval *tv)
{
        if (dsp_fd == -1)
                return;

        if (dsp_out && !rdpsnd_queue_empty())
                FD_SET(dsp_fd, wfds);
        if (dsp_in)
                FD_SET(dsp_fd, rfds);
        if (dsp_fd > *n)
                *n = dsp_fd;
}

void
oss_check_fds(fd_set * rfds, fd_set * wfds)
{
        if (FD_ISSET(dsp_fd, wfds))
                oss_play();
        if (FD_ISSET(dsp_fd, rfds))
                oss_record();
}

static RD_BOOL
detect_esddsp(void)
{
        struct stat s;
        char *preload;

        if (fstat(dsp_fd, &s) == -1)
                return False;

        if (S_ISCHR(s.st_mode) || S_ISBLK(s.st_mode))
                return False;

        preload = getenv("LD_PRELOAD");
        if (preload == NULL)
                return False;

        if (strstr(preload, "esddsp") == NULL)
                return False;

        return True;
}

RD_BOOL
oss_open(int fallback)
{
        int caps;

        if (dsp_fd != -1)
        {
                dsp_refs++;

                if (dsp_mode == O_RDWR)
                        return True;

                if (dsp_mode == fallback)
                        return True;

                dsp_refs--;
                return False;
        }

        dsp_configured = False;
        dsp_broken = False;

        dsp_mode = O_RDWR;
        dsp_fd = open(dsp_dev, O_RDWR | O_NONBLOCK);
        if (dsp_fd != -1)
        {
                ioctl(dsp_fd, SNDCTL_DSP_SETDUPLEX, 0);

                if ((ioctl(dsp_fd, SNDCTL_DSP_GETCAPS, &caps) < 0) || !(caps & DSP_CAP_DUPLEX))
                {
                        close(dsp_fd);
                        dsp_fd = -1;
                }
        }

        if (dsp_fd == -1)
        {
                dsp_mode = fallback;

                dsp_fd = open(dsp_dev, dsp_mode | O_NONBLOCK);
                if (dsp_fd == -1)
                {
                        perror(dsp_dev);
                        return False;
                }
        }

        dsp_refs++;

        in_esddsp = detect_esddsp();

        return True;
}

void
oss_close(void)
{
        dsp_refs--;

        if (dsp_refs != 0)
                return;

        close(dsp_fd);
        dsp_fd = -1;
}

RD_BOOL
oss_open_out(void)
{
        if (!oss_open(O_WRONLY))
                return False;

        dsp_out = True;

        return True;
}

void
oss_close_out(void)
{
        oss_close();

        /* Ack all remaining packets */
        while (!rdpsnd_queue_empty())
                rdpsnd_queue_next(0);

        dsp_out = False;
}

RD_BOOL
oss_open_in(void)
{
        if (!oss_open(O_RDONLY))
                return False;

        dsp_in = True;

        return True;
}

void
oss_close_in(void)
{
        oss_close();

        dsp_in = False;
}

RD_BOOL
oss_format_supported(RD_WAVEFORMATEX * pwfx)
{
        if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
                return False;
        if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))
                return False;
        if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))
                return False;

        return True;
}

RD_BOOL
oss_set_format(RD_WAVEFORMATEX * pwfx)
{
        int fragments;
        static RD_BOOL driver_broken = False;

        if (dsp_configured)
        {
                if ((pwfx->wBitsPerSample == 8) && (format != AFMT_U8))
                        return False;
                if ((pwfx->wBitsPerSample == 16) && (format != AFMT_S16_LE))
                        return False;

                if ((pwfx->nChannels == 2) != !!stereo)
                        return False;

                if (pwfx->nSamplesPerSec != snd_rate)
                        return False;

                return True;
        }

        ioctl(dsp_fd, SNDCTL_DSP_RESET, NULL);
        ioctl(dsp_fd, SNDCTL_DSP_SYNC, NULL);

        if (pwfx->wBitsPerSample == 8)
                format = AFMT_U8;
        else if (pwfx->wBitsPerSample == 16)
                format = AFMT_S16_LE;

        samplewidth = pwfx->wBitsPerSample / 8;

        if (ioctl(dsp_fd, SNDCTL_DSP_SETFMT, &format) == -1)
        {
                perror("SNDCTL_DSP_SETFMT");
                oss_close();
                return False;
        }

        if (pwfx->nChannels == 2)
        {
                stereo = 1;
                samplewidth *= 2;
        }
        else
        {
                stereo = 0;
        }

        if (ioctl(dsp_fd, SNDCTL_DSP_STEREO, &stereo) == -1)
        {
                perror("SNDCTL_DSP_CHANNELS");
                oss_close();
                return False;
        }

        oss_driver.need_resampling = 0;
        snd_rate = pwfx->nSamplesPerSec;
        if (ioctl(dsp_fd, SNDCTL_DSP_SPEED, &snd_rate) == -1)
        {
                uint32 rates[] = { 44100, 48000, 0 };
                uint32 *prates = rates;

                while (*prates != 0)
                {
                        if ((pwfx->nSamplesPerSec != *prates)
                            && (ioctl(dsp_fd, SNDCTL_DSP_SPEED, prates) != -1))
                        {
                                oss_driver.need_resampling = 1;
                                snd_rate = *prates;
                                if (rdpsnd_dsp_resample_set
                                    (snd_rate, pwfx->wBitsPerSample, pwfx->nChannels) == False)
                                {
                                        error("rdpsnd_dsp_resample_set failed");
                                        oss_close();
                                        return False;
                                }

                                break;
                        }
                        prates++;
                }

                if (*prates == 0)
                {
                        perror("SNDCTL_DSP_SPEED");
                        oss_close();
                        return False;
                }
        }

        /* try to get 12 fragments of 2^12 bytes size */
        fragments = (12 << 16) + 12;
        ioctl(dsp_fd, SNDCTL_DSP_SETFRAGMENT, &fragments);

        if (!driver_broken)
        {
                audio_buf_info info;

                memset(&info, 0, sizeof(info));
                if (ioctl(dsp_fd, SNDCTL_DSP_GETOSPACE, &info) == -1)
                {
                        perror("SNDCTL_DSP_GETOSPACE");
                        oss_close();
                        return False;
                }

                if (info.fragments == 0 || info.fragstotal == 0 || info.fragsize == 0)
                {
                        fprintf(stderr,
                                "Broken OSS-driver detected: fragments: %d, fragstotal: %d, fragsize: %d\n",
                                info.fragments, info.fragstotal, info.fragsize);
                        driver_broken = True;
                }
        }

        dsp_configured = True;

        return True;
}

void
oss_volume(uint16 left, uint16 right)
{
        uint32 volume;

        volume = left / (65536 / 100);
        volume |= right / (65536 / 100) << 8;

        if (ioctl(dsp_fd, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
        {
                warning("hardware volume control unavailable, falling back to software volume control!\n");
                oss_driver.wave_out_volume = rdpsnd_dsp_softvol_set;
                rdpsnd_dsp_softvol_set(left, right);
                return;
        }
}

void
oss_play(void)
{
        struct audio_packet *packet;
        ssize_t len;
        STREAM out;

        /* We shouldn't be called if the queue is empty, but still */
        if (rdpsnd_queue_empty())
                return;

        packet = rdpsnd_queue_current_packet();
        out = &packet->s;

        len = out->end - out->p;

        len = write(dsp_fd, out->p, (len > MAX_LEN) ? MAX_LEN : len);
        if (len == -1)
        {
                if (errno != EWOULDBLOCK)
                {
                        if (!dsp_broken)
                                perror("RDPSND: write()");
                        dsp_broken = True;
                        rdpsnd_queue_next(0);
                }
                return;
        }

        dsp_broken = False;

        out->p += len;

        if (out->p == out->end)
        {
                int delay_bytes;
                unsigned long delay_us;
                audio_buf_info info;

                if (in_esddsp)
                {
                        /* EsounD has no way of querying buffer status, so we have to
                         * go with a fixed size. */
                        delay_bytes = out->size;
                }
                else
                {
#ifdef SNDCTL_DSP_GETODELAY
                        delay_bytes = 0;
                        if (ioctl(dsp_fd, SNDCTL_DSP_GETODELAY, &delay_bytes) == -1)
                                delay_bytes = -1;
#else
                        delay_bytes = -1;
#endif

                        if (delay_bytes == -1)
                        {
                                if (ioctl(dsp_fd, SNDCTL_DSP_GETOSPACE, &info) != -1)
                                        delay_bytes = info.fragstotal * info.fragsize - info.bytes;
                                else
                                        delay_bytes = out->size;
                        }
                }

                delay_us = delay_bytes * (1000000 / (samplewidth * snd_rate));
                rdpsnd_queue_next(delay_us);
        }
}

void
oss_record(void)
{
        char buffer[32768];
        int len;

        len = read(dsp_fd, buffer, sizeof(buffer));
        if (len == -1)
        {
                if (errno != EWOULDBLOCK)
                {
                        if (!dsp_broken)
                                perror("RDPSND: read()");
                        dsp_broken = True;
                        rdpsnd_queue_next(0);
                }
                return;
        }

        dsp_broken = False;

        rdpsnd_record(buffer, len);
}

struct audio_driver *
oss_register(char *options)
{
        memset(&oss_driver, 0, sizeof(oss_driver));

        oss_driver.name = "oss";
        oss_driver.description =
                "OSS output driver, default device: " DEFAULTDEVICE " or $AUDIODEV";

        oss_driver.add_fds = oss_add_fds;
        oss_driver.check_fds = oss_check_fds;

        oss_driver.wave_out_open = oss_open_out;
        oss_driver.wave_out_close = oss_close_out;
        oss_driver.wave_out_format_supported = oss_format_supported;
        oss_driver.wave_out_set_format = oss_set_format;
        oss_driver.wave_out_volume = oss_volume;

        oss_driver.wave_in_open = oss_open_in;
        oss_driver.wave_in_close = oss_close_in;
        oss_driver.wave_in_format_supported = oss_format_supported;
        oss_driver.wave_in_set_format = oss_set_format;
        oss_driver.wave_in_volume = NULL;       /* FIXME */

        oss_driver.need_byteswap_on_be = 0;
        oss_driver.need_resampling = 0;

        if (options)
        {
                dsp_dev = xstrdup(options);
        }
        else
        {
                dsp_dev = getenv("AUDIODEV");

                if (dsp_dev == NULL)
                {
                        dsp_dev = DEFAULTDEVICE;
                }
        }

        return &oss_driver;
}
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 2003-2008
5	Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003
6	Copyright 2006-2008 Pierre Ossman <ossman@cendio.se> for Cendio AB
7
8	This program is free software; you can redistribute it and/or modify
9	it under the terms of the GNU General Public License as published by
10	the Free Software Foundation; either version 2 of the License, or
11	(at your option) any later version.
12
13	This program is distributed in the hope that it will be useful,
14	but WITHOUT ANY WARRANTY; without even the implied warranty of
15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16	GNU General Public License for more details.
17
18	You should have received a copy of the GNU General Public License
19	along with this program; if not, write to the Free Software
20	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21	*/
22
23	/*
24	This is a workaround for Esound bug 312665.
25	FIXME: Remove this when Esound is fixed.
26	*/
27	#ifdef _FILE_OFFSET_BITS
28	#undef _FILE_OFFSET_BITS
29	#endif
30
31	#include "rdesktop.h"
32	#include "rdpsnd.h"
33	#include "rdpsnd_dsp.h"
34	#include <unistd.h>
35	#include <fcntl.h>
36	#include <errno.h>
37	#include <unistd.h>
38	#include <sys/time.h>
39	#include <sys/ioctl.h>
40	#include <sys/soundcard.h>
41	#include <sys/types.h>
42	#include <sys/stat.h>
43
44	#define DEFAULTDEVICE "/dev/dsp"
45	#define MAX_LEN 512
46
47	static int dsp_fd = -1;
48	static int dsp_mode;
49	static int dsp_refs;
50
51	static RD_BOOL dsp_configured;
52	static RD_BOOL dsp_broken;
53
54	static RD_BOOL dsp_out;
55	static RD_BOOL dsp_in;
56
57	static int stereo;
58	static int format;
59	static uint32 snd_rate;
60	static short samplewidth;
61	static char *dsp_dev;
62	static RD_BOOL in_esddsp;
63
64	/* This is a just a forward declaration */
65	static struct audio_driver oss_driver;
66
67	void oss_play(void);
68	void oss_record(void);
69
70	void
71	oss_add_fds(int n, fd_set rfds, fd_set * wfds, struct timeval *tv)
72	{
73	if (dsp_fd == -1)
74	return;
75
76	if (dsp_out && !rdpsnd_queue_empty())
77	FD_SET(dsp_fd, wfds);
78	if (dsp_in)
79	FD_SET(dsp_fd, rfds);
80	if (dsp_fd > *n)
81	*n = dsp_fd;
82	}
83
84	void
85	oss_check_fds(fd_set * rfds, fd_set * wfds)
86	{
87	if (FD_ISSET(dsp_fd, wfds))
88	oss_play();
89	if (FD_ISSET(dsp_fd, rfds))
90	oss_record();
91	}
92
93	static RD_BOOL
94	detect_esddsp(void)
95	{
96	struct stat s;
97	char *preload;
98
99	if (fstat(dsp_fd, &s) == -1)
100	return False;
101
102	if (S_ISCHR(s.st_mode) \|\| S_ISBLK(s.st_mode))
103	return False;
104
105	preload = getenv("LD_PRELOAD");
106	if (preload == NULL)
107	return False;
108
109	if (strstr(preload, "esddsp") == NULL)
110	return False;
111
112	return True;
113	}
114
115	RD_BOOL
116	oss_open(int fallback)
117	{
118	int caps;
119
120	if (dsp_fd != -1)
121	{
122	dsp_refs++;
123
124	if (dsp_mode == O_RDWR)
125	return True;
126
127	if (dsp_mode == fallback)
128	return True;
129
130	dsp_refs--;
131	return False;
132	}
133
134	dsp_configured = False;
135	dsp_broken = False;
136
137	dsp_mode = O_RDWR;
138	dsp_fd = open(dsp_dev, O_RDWR \| O_NONBLOCK);
139	if (dsp_fd != -1)
140	{
141	ioctl(dsp_fd, SNDCTL_DSP_SETDUPLEX, 0);
142
143	if ((ioctl(dsp_fd, SNDCTL_DSP_GETCAPS, &caps) < 0) \|\| !(caps & DSP_CAP_DUPLEX))
144	{
145	close(dsp_fd);
146	dsp_fd = -1;
147	}
148	}
149
150	if (dsp_fd == -1)
151	{
152	dsp_mode = fallback;
153
154	dsp_fd = open(dsp_dev, dsp_mode \| O_NONBLOCK);
155	if (dsp_fd == -1)
156	{
157	perror(dsp_dev);
158	return False;
159	}
160	}
161
162	dsp_refs++;
163
164	in_esddsp = detect_esddsp();
165
166	return True;
167	}
168
169	void
170	oss_close(void)
171	{
172	dsp_refs--;
173
174	if (dsp_refs != 0)
175	return;
176
177	close(dsp_fd);
178	dsp_fd = -1;
179	}
180
181	RD_BOOL
182	oss_open_out(void)
183	{
184	if (!oss_open(O_WRONLY))
185	return False;
186
187	dsp_out = True;
188
189	return True;
190	}
191
192	void
193	oss_close_out(void)
194	{
195	oss_close();
196
197	/* Ack all remaining packets */
198	while (!rdpsnd_queue_empty())
199	rdpsnd_queue_next(0);
200
201	dsp_out = False;
202	}
203
204	RD_BOOL
205	oss_open_in(void)
206	{
207	if (!oss_open(O_RDONLY))
208	return False;
209
210	dsp_in = True;
211
212	return True;
213	}
214
215	void
216	oss_close_in(void)
217	{
218	oss_close();
219
220	dsp_in = False;
221	}
222
223	RD_BOOL
224	oss_format_supported(RD_WAVEFORMATEX * pwfx)
225	{
226	if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
227	return False;
228	if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))
229	return False;
230	if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))
231	return False;
232
233	return True;
234	}
235
236	RD_BOOL
237	oss_set_format(RD_WAVEFORMATEX * pwfx)
238	{
239	int fragments;
240	static RD_BOOL driver_broken = False;
241
242	if (dsp_configured)
243	{
244	if ((pwfx->wBitsPerSample == 8) && (format != AFMT_U8))
245	return False;
246	if ((pwfx->wBitsPerSample == 16) && (format != AFMT_S16_LE))
247	return False;
248
249	if ((pwfx->nChannels == 2) != !!stereo)
250	return False;
251
252	if (pwfx->nSamplesPerSec != snd_rate)
253	return False;
254
255	return True;
256	}
257
258	ioctl(dsp_fd, SNDCTL_DSP_RESET, NULL);
259	ioctl(dsp_fd, SNDCTL_DSP_SYNC, NULL);
260
261	if (pwfx->wBitsPerSample == 8)
262	format = AFMT_U8;
263	else if (pwfx->wBitsPerSample == 16)
264	format = AFMT_S16_LE;
265
266	samplewidth = pwfx->wBitsPerSample / 8;
267
268	if (ioctl(dsp_fd, SNDCTL_DSP_SETFMT, &format) == -1)
269	{
270	perror("SNDCTL_DSP_SETFMT");
271	oss_close();
272	return False;
273	}
274
275	if (pwfx->nChannels == 2)
276	{
277	stereo = 1;
278	samplewidth *= 2;
279	}
280	else
281	{
282	stereo = 0;
283	}
284
285	if (ioctl(dsp_fd, SNDCTL_DSP_STEREO, &stereo) == -1)
286	{
287	perror("SNDCTL_DSP_CHANNELS");
288	oss_close();
289	return False;
290	}
291
292	oss_driver.need_resampling = 0;
293	snd_rate = pwfx->nSamplesPerSec;
294	if (ioctl(dsp_fd, SNDCTL_DSP_SPEED, &snd_rate) == -1)
295	{
296	uint32 rates[] = { 44100, 48000, 0 };
297	uint32 *prates = rates;
298
299	while (*prates != 0)
300	{
301	if ((pwfx->nSamplesPerSec != *prates)
302	&& (ioctl(dsp_fd, SNDCTL_DSP_SPEED, prates) != -1))
303	{
304	oss_driver.need_resampling = 1;
305	snd_rate = *prates;
306	if (rdpsnd_dsp_resample_set
307	(snd_rate, pwfx->wBitsPerSample, pwfx->nChannels) == False)
308	{
309	error("rdpsnd_dsp_resample_set failed");
310	oss_close();
311	return False;
312	}
313
314	break;
315	}
316	prates++;
317	}
318
319	if (*prates == 0)
320	{
321	perror("SNDCTL_DSP_SPEED");
322	oss_close();
323	return False;
324	}
325	}
326
327	/* try to get 12 fragments of 2^12 bytes size */
328	fragments = (12 << 16) + 12;
329	ioctl(dsp_fd, SNDCTL_DSP_SETFRAGMENT, &fragments);
330
331	if (!driver_broken)
332	{
333	audio_buf_info info;
334
335	memset(&info, 0, sizeof(info));
336	if (ioctl(dsp_fd, SNDCTL_DSP_GETOSPACE, &info) == -1)
337	{
338	perror("SNDCTL_DSP_GETOSPACE");
339	oss_close();
340	return False;
341	}
342
343	if (info.fragments == 0 \|\| info.fragstotal == 0 \|\| info.fragsize == 0)
344	{
345	fprintf(stderr,
346	"Broken OSS-driver detected: fragments: %d, fragstotal: %d, fragsize: %d\n",
347	info.fragments, info.fragstotal, info.fragsize);
348	driver_broken = True;
349	}
350	}
351
352	dsp_configured = True;
353
354	return True;
355	}
356
357	void
358	oss_volume(uint16 left, uint16 right)
359	{
360	uint32 volume;
361
362	volume = left / (65536 / 100);
363	volume \|= right / (65536 / 100) << 8;
364
365	if (ioctl(dsp_fd, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
366	{
367	warning("hardware volume control unavailable, falling back to software volume control!\n");
368	oss_driver.wave_out_volume = rdpsnd_dsp_softvol_set;
369	rdpsnd_dsp_softvol_set(left, right);
370	return;
371	}
372	}
373
374	void
375	oss_play(void)
376	{
377	struct audio_packet *packet;
378	ssize_t len;
379	STREAM out;
380
381	/* We shouldn't be called if the queue is empty, but still */
382	if (rdpsnd_queue_empty())
383	return;
384
385	packet = rdpsnd_queue_current_packet();
386	out = &packet->s;
387
388	len = out->end - out->p;
389
390	len = write(dsp_fd, out->p, (len > MAX_LEN) ? MAX_LEN : len);
391	if (len == -1)
392	{
393	if (errno != EWOULDBLOCK)
394	{
395	if (!dsp_broken)
396	perror("RDPSND: write()");
397	dsp_broken = True;
398	rdpsnd_queue_next(0);
399	}
400	return;
401	}
402
403	dsp_broken = False;
404
405	out->p += len;
406
407	if (out->p == out->end)
408	{
409	int delay_bytes;
410	unsigned long delay_us;
411	audio_buf_info info;
412
413	if (in_esddsp)
414	{
415	/* EsounD has no way of querying buffer status, so we have to
416	* go with a fixed size. */
417	delay_bytes = out->size;
418	}
419	else
420	{
421	#ifdef SNDCTL_DSP_GETODELAY
422	delay_bytes = 0;
423	if (ioctl(dsp_fd, SNDCTL_DSP_GETODELAY, &delay_bytes) == -1)
424	delay_bytes = -1;
425	#else
426	delay_bytes = -1;
427	#endif
428
429	if (delay_bytes == -1)
430	{
431	if (ioctl(dsp_fd, SNDCTL_DSP_GETOSPACE, &info) != -1)
432	delay_bytes = info.fragstotal * info.fragsize - info.bytes;
433	else
434	delay_bytes = out->size;
435	}
436	}
437
438	delay_us = delay_bytes * (1000000 / (samplewidth * snd_rate));
439	rdpsnd_queue_next(delay_us);
440	}
441	}
442
443	void
444	oss_record(void)
445	{
446	char buffer[32768];
447	int len;
448
449	len = read(dsp_fd, buffer, sizeof(buffer));
450	if (len == -1)
451	{
452	if (errno != EWOULDBLOCK)
453	{
454	if (!dsp_broken)
455	perror("RDPSND: read()");
456	dsp_broken = True;
457	rdpsnd_queue_next(0);
458	}
459	return;
460	}
461
462	dsp_broken = False;
463
464	rdpsnd_record(buffer, len);
465	}
466
467	struct audio_driver *
468	oss_register(char *options)
469	{
470	memset(&oss_driver, 0, sizeof(oss_driver));
471
472	oss_driver.name = "oss";
473	oss_driver.description =
474	"OSS output driver, default device: " DEFAULTDEVICE " or $AUDIODEV";
475
476	oss_driver.add_fds = oss_add_fds;
477	oss_driver.check_fds = oss_check_fds;
478
479	oss_driver.wave_out_open = oss_open_out;
480	oss_driver.wave_out_close = oss_close_out;
481	oss_driver.wave_out_format_supported = oss_format_supported;
482	oss_driver.wave_out_set_format = oss_set_format;
483	oss_driver.wave_out_volume = oss_volume;
484
485	oss_driver.wave_in_open = oss_open_in;
486	oss_driver.wave_in_close = oss_close_in;
487	oss_driver.wave_in_format_supported = oss_format_supported;
488	oss_driver.wave_in_set_format = oss_set_format;
489	oss_driver.wave_in_volume = NULL; /* FIXME */
490
491	oss_driver.need_byteswap_on_be = 0;
492	oss_driver.need_resampling = 0;
493
494	if (options)
495	{
496	dsp_dev = xstrdup(options);
497	}
498	else
499	{
500	dsp_dev = getenv("AUDIODEV");
501
502	if (dsp_dev == NULL)
503	{
504	dsp_dev = DEFAULTDEVICE;
505	}
506	}
507
508	return &oss_driver;
509	}