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
   Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003

   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 BOOL dsp_busy;

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

        if (rdpsnd_queue_empty())
                return;

        FD_SET(dsp_fd, wfds);
        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();
}

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(void)
{
        if ((dsp_fd = open(dsp_dev, O_WRONLY)) == -1)
        {
                perror(dsp_dev);
                return False;
        }

        in_esddsp = detect_esddsp();

        return True;
}

void
oss_close(void)
{
        close(dsp_fd);
        dsp_fd = -1;
        dsp_busy = False;
}

BOOL
oss_format_supported(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(WAVEFORMATEX * pwfx)
{
        int stereo, format, fragments;
        static BOOL driver_broken = False;

        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;
                }
        }

        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);
        }
}

static struct audio_driver oss_driver = {
        .name = "oss",
        .description = "OSS output driver, default device: " DEFAULTDEVICE " or $AUDIODEV",

        .add_fds = oss_add_fds,
        .check_fds = oss_check_fds,

        .wave_out_open = oss_open,
        .wave_out_close = oss_close,
        .wave_out_format_supported = oss_format_supported,
        .wave_out_set_format = oss_set_format,
        .wave_out_volume = oss_volume,

        .need_byteswap_on_be = 0,
        .need_resampling = 0,
};

struct audio_driver *
oss_register(char *options)
{
        if (options)
        {
                dsp_dev = xstrdup(options);
        }
        else
        {
                dsp_dev = getenv("AUDIODEV");

                if (dsp_dev == NULL)
                {
                        dsp_dev = xstrdup(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
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	static struct audio_driver oss_driver = {
320	.name = "oss",
321	.description = "OSS output driver, default device: " DEFAULTDEVICE " or $AUDIODEV",
322
323	.add_fds = oss_add_fds,
324	.check_fds = oss_check_fds,
325
326	.wave_out_open = oss_open,
327	.wave_out_close = oss_close,
328	.wave_out_format_supported = oss_format_supported,
329	.wave_out_set_format = oss_set_format,
330	.wave_out_volume = oss_volume,
331
332	.need_byteswap_on_be = 0,
333	.need_resampling = 0,
334	};
335
336	struct audio_driver *
337	oss_register(char *options)
338	{
339	if (options)
340	{
341	dsp_dev = xstrdup(options);
342	}
343	else
344	{
345	dsp_dev = getenv("AUDIODEV");
346
347	if (dsp_dev == NULL)
348	{
349	dsp_dev = xstrdup(DEFAULTDEVICE);
350	}
351	}
352
353	return &oss_driver;
354	}