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 2003-2007
   Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003
   Copyright 2006-2007 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 BOOL dsp_configured;

static BOOL dsp_out;
static BOOL dsp_in;

static int stereo;
static int format;
static int snd_rate;
static short samplewidth;
static char *dsp_dev;
static 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 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;
}

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_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;
}

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;
}

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;
}

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;
}

BOOL
oss_set_format(RD_WAVEFORMATEX * pwfx)
{
        int fragments;
        static 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)
        {
                int rates[] = { 44100, 48000, 0 };
                int *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)
                        perror("write audio");
                return;
        }

        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)
                        perror("read audio");
                return;
        }

        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	astrand	963	/* -- c-basic-offset: 8 --
2	matthewc	475	rdesktop: A Remote Desktop Protocol client.
3			Sound Channel Process Functions - Open Sound System
4	jsorg71	1365	Copyright (C) Matthew Chapman 2003-2007
5	matthewc	475	Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003
6	jsorg71	1365	Copyright 2006-2007 Pierre Ossman <ossman@cendio.se> for Cendio AB
7	matthewc	475
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	astrand	1227	/*
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	matthewc	475	#include "rdesktop.h"
32	stargo	1254	#include "rdpsnd.h"
33	stargo	1269	#include "rdpsnd_dsp.h"
34	matthewc	475	#include <unistd.h>
35			#include <fcntl.h>
36			#include <errno.h>
37	ossman_	1302	#include <unistd.h>
38	stargo	510	#include <sys/time.h>
39	matthewc	475	#include <sys/ioctl.h>
40			#include <sys/soundcard.h>
41	ossman_	1302	#include <sys/types.h>
42			#include <sys/stat.h>
43	matthewc	475
44	stargo	1254	#define DEFAULTDEVICE "/dev/dsp"
45	stargo	1247	#define MAX_LEN 512
46	matthewc	475
47	ossman_	1346	static int dsp_fd = -1;
48	ossman_	1361	static int dsp_mode;
49			static int dsp_refs;
50	ossman_	1346
51	ossman_	1361	static BOOL dsp_configured;
52
53			static BOOL dsp_out;
54			static BOOL dsp_in;
55
56			static int stereo;
57			static int format;
58	stargo	1247	static int snd_rate;
59			static short samplewidth;
60	stargo	1255	static char *dsp_dev;
61	ossman_	1302	static BOOL in_esddsp;
62	matthewc	475
63	ossman_	1345	/* This is a just a forward declaration */
64			static struct audio_driver oss_driver;
65
66	ossman_	1346	void oss_play(void);
67	ossman_	1361	void oss_record(void);
68	ossman_	1346
69			void
70			oss_add_fds(int n, fd_set rfds, fd_set * wfds, struct timeval *tv)
71			{
72			if (dsp_fd == -1)
73			return;
74
75	ossman_	1361	if (dsp_out && !rdpsnd_queue_empty())
76			FD_SET(dsp_fd, wfds);
77			if (dsp_in)
78			FD_SET(dsp_fd, rfds);
79	ossman_	1346	if (dsp_fd > *n)
80			*n = dsp_fd;
81			}
82
83			void
84			oss_check_fds(fd_set * rfds, fd_set * wfds)
85			{
86			if (FD_ISSET(dsp_fd, wfds))
87			oss_play();
88	ossman_	1361	if (FD_ISSET(dsp_fd, rfds))
89			oss_record();
90	ossman_	1346	}
91
92	ossman_	1302	static BOOL
93			detect_esddsp(void)
94			{
95			struct stat s;
96			char *preload;
97
98	ossman_	1346	if (fstat(dsp_fd, &s) == -1)
99	ossman_	1302	return False;
100
101			if (S_ISCHR(s.st_mode) \|\| S_ISBLK(s.st_mode))
102			return False;
103
104			preload = getenv("LD_PRELOAD");
105			if (preload == NULL)
106			return False;
107
108			if (strstr(preload, "esddsp") == NULL)
109			return False;
110
111			return True;
112			}
113
114	matthewc	475	BOOL
115	ossman_	1361	oss_open(int fallback)
116	matthewc	475	{
117	ossman_	1361	int caps;
118
119			if (dsp_fd != -1)
120	matthewc	475	{
121	ossman_	1361	dsp_refs++;
122
123			if (dsp_mode == O_RDWR)
124			return True;
125
126			if (dsp_mode == fallback)
127			return True;
128
129			dsp_refs--;
130	matthewc	475	return False;
131			}
132
133	ossman_	1361	dsp_configured = False;
134
135			dsp_mode = O_RDWR;
136			dsp_fd = open(dsp_dev, O_RDWR \| O_NONBLOCK);
137			if (dsp_fd != -1)
138			{
139			ioctl(dsp_fd, SNDCTL_DSP_SETDUPLEX, 0);
140
141			if ((ioctl(dsp_fd, SNDCTL_DSP_GETCAPS, &caps) < 0) \|\| !(caps & DSP_CAP_DUPLEX))
142			{
143			close(dsp_fd);
144			dsp_fd = -1;
145			}
146			}
147
148			if (dsp_fd == -1)
149			{
150			dsp_mode = fallback;
151
152			dsp_fd = open(dsp_dev, dsp_mode \| O_NONBLOCK);
153			if (dsp_fd == -1)
154			{
155			perror(dsp_dev);
156			return False;
157			}
158			}
159
160			dsp_refs++;
161
162	ossman_	1302	in_esddsp = detect_esddsp();
163
164	matthewc	475	return True;
165			}
166
167			void
168	stargo	1255	oss_close(void)
169	matthewc	475	{
170	ossman_	1361	dsp_refs--;
171
172			if (dsp_refs != 0)
173			return;
174
175	ossman_	1346	close(dsp_fd);
176			dsp_fd = -1;
177	matthewc	475	}
178
179			BOOL
180	ossman_	1361	oss_open_out(void)
181			{
182			if (!oss_open(O_WRONLY))
183			return False;
184
185			dsp_out = True;
186
187			return True;
188			}
189
190			void
191			oss_close_out(void)
192			{
193			oss_close();
194
195			/* Ack all remaining packets */
196			while (!rdpsnd_queue_empty())
197			rdpsnd_queue_next(0);
198
199			dsp_out = False;
200			}
201
202			BOOL
203			oss_open_in(void)
204			{
205			if (!oss_open(O_RDONLY))
206			return False;
207
208			dsp_in = True;
209
210			return True;
211			}
212
213			void
214			oss_close_in(void)
215			{
216			oss_close();
217
218			dsp_in = False;
219			}
220
221			BOOL
222	jsorg71	1364	oss_format_supported(RD_WAVEFORMATEX * pwfx)
223	matthewc	475	{
224			if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
225			return False;
226			if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))
227			return False;
228			if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))
229			return False;
230
231			return True;
232			}
233
234			BOOL
235	jsorg71	1364	oss_set_format(RD_WAVEFORMATEX * pwfx)
236	matthewc	475	{
237	ossman_	1361	int fragments;
238	stargo	1247	static BOOL driver_broken = False;
239	matthewc	475
240	ossman_	1361	if (dsp_configured)
241			{
242			if ((pwfx->wBitsPerSample == 8) && (format != AFMT_U8))
243			return False;
244			if ((pwfx->wBitsPerSample == 16) && (format != AFMT_S16_LE))
245			return False;
246
247			if ((pwfx->nChannels == 2) != !!stereo)
248			return False;
249
250			if (pwfx->nSamplesPerSec != snd_rate)
251			return False;
252
253			return True;
254			}
255
256	ossman_	1346	ioctl(dsp_fd, SNDCTL_DSP_RESET, NULL);
257			ioctl(dsp_fd, SNDCTL_DSP_SYNC, NULL);
258	matthewc	475
259			if (pwfx->wBitsPerSample == 8)
260			format = AFMT_U8;
261			else if (pwfx->wBitsPerSample == 16)
262			format = AFMT_S16_LE;
263
264	stargo	1247	samplewidth = pwfx->wBitsPerSample / 8;
265	stargo	510
266	ossman_	1346	if (ioctl(dsp_fd, SNDCTL_DSP_SETFMT, &format) == -1)
267	matthewc	475	{
268			perror("SNDCTL_DSP_SETFMT");
269	astrand	1318	oss_close();
270	matthewc	475	return False;
271			}
272
273	stargo	760	if (pwfx->nChannels == 2)
274	matthewc	475	{
275	stargo	760	stereo = 1;
276	stargo	1247	samplewidth *= 2;
277	stargo	760	}
278			else
279			{
280			stereo = 0;
281			}
282
283	ossman_	1346	if (ioctl(dsp_fd, SNDCTL_DSP_STEREO, &stereo) == -1)
284	stargo	760	{
285	matthewc	475	perror("SNDCTL_DSP_CHANNELS");
286	astrand	1318	oss_close();
287	matthewc	475	return False;
288			}
289
290	stargo	1286	oss_driver.need_resampling = 0;
291	stargo	1247	snd_rate = pwfx->nSamplesPerSec;
292	ossman_	1346	if (ioctl(dsp_fd, SNDCTL_DSP_SPEED, &snd_rate) == -1)
293	stargo	510	{
294	stargo	1286	int rates[] = { 44100, 48000, 0 };
295			int *prates = rates;
296
297			while (*prates != 0)
298			{
299			if ((pwfx->nSamplesPerSec != *prates)
300	ossman_	1346	&& (ioctl(dsp_fd, SNDCTL_DSP_SPEED, prates) != -1))
301	stargo	1286	{
302			oss_driver.need_resampling = 1;
303			snd_rate = *prates;
304			if (rdpsnd_dsp_resample_set
305			(snd_rate, pwfx->wBitsPerSample, pwfx->nChannels) == False)
306			{
307			error("rdpsnd_dsp_resample_set failed");
308	astrand	1318	oss_close();
309	stargo	1286	return False;
310			}
311
312			break;
313			}
314			prates++;
315			}
316
317			if (*prates == 0)
318			{
319			perror("SNDCTL_DSP_SPEED");
320	astrand	1318	oss_close();
321	stargo	1286	return False;
322			}
323	matthewc	475	}
324
325	stargo	1247	/* try to get 12 fragments of 2^12 bytes size */
326			fragments = (12 << 16) + 12;
327	ossman_	1346	ioctl(dsp_fd, SNDCTL_DSP_SETFRAGMENT, &fragments);
328	stargo	761
329	stargo	1247	if (!driver_broken)
330	stargo	761	{
331			audio_buf_info info;
332
333	astrand	801	memset(&info, 0, sizeof(info));
334	ossman_	1346	if (ioctl(dsp_fd, SNDCTL_DSP_GETOSPACE, &info) == -1)
335	stargo	761	{
336			perror("SNDCTL_DSP_GETOSPACE");
337	astrand	1318	oss_close();
338	stargo	761	return False;
339			}
340
341			if (info.fragments == 0 \|\| info.fragstotal == 0 \|\| info.fragsize == 0)
342			{
343			fprintf(stderr,
344			"Broken OSS-driver detected: fragments: %d, fragstotal: %d, fragsize: %d\n",
345			info.fragments, info.fragstotal, info.fragsize);
346	stargo	1247	driver_broken = True;
347	stargo	761	}
348			}
349
350	ossman_	1361	dsp_configured = True;
351
352	matthewc	475	return True;
353			}
354
355			void
356	stargo	1255	oss_volume(uint16 left, uint16 right)
357	stargo	491	{
358			uint32 volume;
359
360	astrand	499	volume = left / (65536 / 100);
361			volume \|= right / (65536 / 100) << 8;
362	stargo	509
363	ossman_	1346	if (ioctl(dsp_fd, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
364	stargo	491	{
365	stargo	1275	warning("hardware volume control unavailable, falling back to software volume control!\n");
366	stargo	1269	oss_driver.wave_out_volume = rdpsnd_dsp_softvol_set;
367	stargo	1275	rdpsnd_dsp_softvol_set(left, right);
368	stargo	491	return;
369			}
370			}
371
372			void
373	stargo	1255	oss_play(void)
374	matthewc	475	{
375			struct audio_packet *packet;
376			ssize_t len;
377			STREAM out;
378
379	ossman_	1346	/* We shouldn't be called if the queue is empty, but still */
380	stargo	1254	if (rdpsnd_queue_empty())
381	stargo	1247	return;
382	matthewc	475
383	stargo	1254	packet = rdpsnd_queue_current_packet();
384	stargo	1247	out = &packet->s;
385	matthewc	475
386	stargo	1247	len = out->end - out->p;
387	stargo	761
388	ossman_	1346	len = write(dsp_fd, out->p, (len > MAX_LEN) ? MAX_LEN : len);
389	stargo	1247	if (len == -1)
390			{
391			if (errno != EWOULDBLOCK)
392			perror("write audio");
393			return;
394			}
395	stargo	761
396	stargo	1247	out->p += len;
397	ossman_	1302
398	stargo	1247	if (out->p == out->end)
399			{
400	ossman_	1302	int delay_bytes;
401			unsigned long delay_us;
402			audio_buf_info info;
403	stargo	761
404	ossman_	1302	if (in_esddsp)
405	matthewc	475	{
406	ossman_	1302	/* EsounD has no way of querying buffer status, so we have to
407			* go with a fixed size. */
408			delay_bytes = out->size;
409	stargo	1247	}
410			else
411			{
412	ossman_	1302	#ifdef SNDCTL_DSP_GETODELAY
413			delay_bytes = 0;
414	ossman_	1346	if (ioctl(dsp_fd, SNDCTL_DSP_GETODELAY, &delay_bytes) == -1)
415	ossman_	1302	delay_bytes = -1;
416			#else
417			delay_bytes = -1;
418			#endif
419
420			if (delay_bytes == -1)
421			{
422	ossman_	1346	if (ioctl(dsp_fd, SNDCTL_DSP_GETOSPACE, &info) != -1)
423	ossman_	1302	delay_bytes = info.fragstotal * info.fragsize - info.bytes;
424			else
425			delay_bytes = out->size;
426			}
427	matthewc	475	}
428	ossman_	1302
429			delay_us = delay_bytes * (1000000 / (samplewidth * snd_rate));
430			rdpsnd_queue_next(delay_us);
431	matthewc	475	}
432			}
433	stargo	1255
434	ossman_	1361	void
435			oss_record(void)
436			{
437			char buffer[32768];
438			int len;
439
440			len = read(dsp_fd, buffer, sizeof(buffer));
441			if (len == -1)
442			{
443			if (errno != EWOULDBLOCK)
444			perror("read audio");
445			return;
446			}
447
448			rdpsnd_record(buffer, len);
449			}
450
451	stargo	1351	struct audio_driver *
452			oss_register(char *options)
453			{
454	ossman_	1356	memset(&oss_driver, 0, sizeof(oss_driver));
455
456			oss_driver.name = "oss";
457	stargo	1351	oss_driver.description =
458	ossman_	1356	"OSS output driver, default device: " DEFAULTDEVICE " or $AUDIODEV";
459	ossman_	1345
460	stargo	1351	oss_driver.add_fds = oss_add_fds;
461			oss_driver.check_fds = oss_check_fds;
462	ossman_	1346
463	ossman_	1361	oss_driver.wave_out_open = oss_open_out;
464			oss_driver.wave_out_close = oss_close_out;
465	stargo	1351	oss_driver.wave_out_format_supported = oss_format_supported;
466			oss_driver.wave_out_set_format = oss_set_format;
467			oss_driver.wave_out_volume = oss_volume;
468	ossman_	1345
469	ossman_	1361	oss_driver.wave_in_open = oss_open_in;
470			oss_driver.wave_in_close = oss_close_in;
471			oss_driver.wave_in_format_supported = oss_format_supported;
472			oss_driver.wave_in_set_format = oss_set_format;
473			oss_driver.wave_in_volume = NULL; /* FIXME */
474
475	stargo	1351	oss_driver.need_byteswap_on_be = 0;
476			oss_driver.need_resampling = 0;
477	ossman_	1345
478	stargo	1255	if (options)
479			{
480			dsp_dev = xstrdup(options);
481			}
482			else
483			{
484			dsp_dev = getenv("AUDIODEV");
485
486			if (dsp_dev == NULL)
487			{
488	ossman_	1356	dsp_dev = DEFAULTDEVICE;
489	stargo	1255	}
490			}
491
492			return &oss_driver;
493			}