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 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;

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

        if (fstat(g_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 ((g_dsp_fd = open(dsp_dev, O_WRONLY)) == -1)
        {
                perror(dsp_dev);
                return False;
        }

        in_esddsp = detect_esddsp();

        return True;
}

void
oss_close(void)
{
        close(g_dsp_fd);
        g_dsp_busy = 0;
}

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(g_dsp_fd, SNDCTL_DSP_RESET, NULL);
        ioctl(g_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(g_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(g_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(g_dsp_fd, SNDCTL_DSP_SPEED, &snd_rate) == -1)
        {
                int rates[] = { 44100, 48000, 0 };
                int *prates = rates;

                while (*prates != 0)
                {
                        if ((pwfx->nSamplesPerSec != *prates)
                            && (ioctl(g_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(g_dsp_fd, SNDCTL_DSP_SETFRAGMENT, &fragments);

        if (!driver_broken)
        {
                audio_buf_info info;

                memset(&info, 0, sizeof(info));
                if (ioctl(g_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(g_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;

        if (rdpsnd_queue_empty())
        {
                g_dsp_busy = 0;
                return;
        }

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

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

        len = write(g_dsp_fd, out->p, (len > MAX_LEN) ? MAX_LEN : len);
        if (len == -1)
        {
                if (errno != EWOULDBLOCK)
                        perror("write audio");
                g_dsp_busy = 1;
                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(g_dsp_fd, SNDCTL_DSP_GETODELAY, &delay_bytes) == -1)
                                delay_bytes = -1;
#else
                        delay_bytes = -1;
#endif

                        if (delay_bytes == -1)
                        {
                                if (ioctl(g_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);
        }
        else
        {
                g_dsp_busy = 1;
        }

        return;
}

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

        .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,
        .wave_out_play = oss_play,

        .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 snd_rate;
47	static short samplewidth;
48	static char *dsp_dev;
49	static BOOL in_esddsp;
50
51	/* This is a just a forward declaration */
52	static struct audio_driver oss_driver;
53
54	static BOOL
55	detect_esddsp(void)
56	{
57	struct stat s;
58	char *preload;
59
60	if (fstat(g_dsp_fd, &s) == -1)
61	return False;
62
63	if (S_ISCHR(s.st_mode) \|\| S_ISBLK(s.st_mode))
64	return False;
65
66	preload = getenv("LD_PRELOAD");
67	if (preload == NULL)
68	return False;
69
70	if (strstr(preload, "esddsp") == NULL)
71	return False;
72
73	return True;
74	}
75
76	BOOL
77	oss_open(void)
78	{
79	if ((g_dsp_fd = open(dsp_dev, O_WRONLY)) == -1)
80	{
81	perror(dsp_dev);
82	return False;
83	}
84
85	in_esddsp = detect_esddsp();
86
87	return True;
88	}
89
90	void
91	oss_close(void)
92	{
93	close(g_dsp_fd);
94	g_dsp_busy = 0;
95	}
96
97	BOOL
98	oss_format_supported(WAVEFORMATEX * pwfx)
99	{
100	if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
101	return False;
102	if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))
103	return False;
104	if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))
105	return False;
106
107	return True;
108	}
109
110	BOOL
111	oss_set_format(WAVEFORMATEX * pwfx)
112	{
113	int stereo, format, fragments;
114	static BOOL driver_broken = False;
115
116	ioctl(g_dsp_fd, SNDCTL_DSP_RESET, NULL);
117	ioctl(g_dsp_fd, SNDCTL_DSP_SYNC, NULL);
118
119	if (pwfx->wBitsPerSample == 8)
120	format = AFMT_U8;
121	else if (pwfx->wBitsPerSample == 16)
122	format = AFMT_S16_LE;
123
124	samplewidth = pwfx->wBitsPerSample / 8;
125
126	if (ioctl(g_dsp_fd, SNDCTL_DSP_SETFMT, &format) == -1)
127	{
128	perror("SNDCTL_DSP_SETFMT");
129	oss_close();
130	return False;
131	}
132
133	if (pwfx->nChannels == 2)
134	{
135	stereo = 1;
136	samplewidth *= 2;
137	}
138	else
139	{
140	stereo = 0;
141	}
142
143	if (ioctl(g_dsp_fd, SNDCTL_DSP_STEREO, &stereo) == -1)
144	{
145	perror("SNDCTL_DSP_CHANNELS");
146	oss_close();
147	return False;
148	}
149
150	oss_driver.need_resampling = 0;
151	snd_rate = pwfx->nSamplesPerSec;
152	if (ioctl(g_dsp_fd, SNDCTL_DSP_SPEED, &snd_rate) == -1)
153	{
154	int rates[] = { 44100, 48000, 0 };
155	int *prates = rates;
156
157	while (*prates != 0)
158	{
159	if ((pwfx->nSamplesPerSec != *prates)
160	&& (ioctl(g_dsp_fd, SNDCTL_DSP_SPEED, prates) != -1))
161	{
162	oss_driver.need_resampling = 1;
163	snd_rate = *prates;
164	if (rdpsnd_dsp_resample_set
165	(snd_rate, pwfx->wBitsPerSample, pwfx->nChannels) == False)
166	{
167	error("rdpsnd_dsp_resample_set failed");
168	oss_close();
169	return False;
170	}
171
172	break;
173	}
174	prates++;
175	}
176
177	if (*prates == 0)
178	{
179	perror("SNDCTL_DSP_SPEED");
180	oss_close();
181	return False;
182	}
183	}
184
185	/* try to get 12 fragments of 2^12 bytes size */
186	fragments = (12 << 16) + 12;
187	ioctl(g_dsp_fd, SNDCTL_DSP_SETFRAGMENT, &fragments);
188
189	if (!driver_broken)
190	{
191	audio_buf_info info;
192
193	memset(&info, 0, sizeof(info));
194	if (ioctl(g_dsp_fd, SNDCTL_DSP_GETOSPACE, &info) == -1)
195	{
196	perror("SNDCTL_DSP_GETOSPACE");
197	oss_close();
198	return False;
199	}
200
201	if (info.fragments == 0 \|\| info.fragstotal == 0 \|\| info.fragsize == 0)
202	{
203	fprintf(stderr,
204	"Broken OSS-driver detected: fragments: %d, fragstotal: %d, fragsize: %d\n",
205	info.fragments, info.fragstotal, info.fragsize);
206	driver_broken = True;
207	}
208	}
209
210	return True;
211	}
212
213	void
214	oss_volume(uint16 left, uint16 right)
215	{
216	uint32 volume;
217
218	volume = left / (65536 / 100);
219	volume \|= right / (65536 / 100) << 8;
220
221	if (ioctl(g_dsp_fd, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
222	{
223	warning("hardware volume control unavailable, falling back to software volume control!\n");
224	oss_driver.wave_out_volume = rdpsnd_dsp_softvol_set;
225	rdpsnd_dsp_softvol_set(left, right);
226	return;
227	}
228	}
229
230	void
231	oss_play(void)
232	{
233	struct audio_packet *packet;
234	ssize_t len;
235	STREAM out;
236
237	if (rdpsnd_queue_empty())
238	{
239	g_dsp_busy = 0;
240	return;
241	}
242
243	packet = rdpsnd_queue_current_packet();
244	out = &packet->s;
245
246	len = out->end - out->p;
247
248	len = write(g_dsp_fd, out->p, (len > MAX_LEN) ? MAX_LEN : len);
249	if (len == -1)
250	{
251	if (errno != EWOULDBLOCK)
252	perror("write audio");
253	g_dsp_busy = 1;
254	return;
255	}
256
257	out->p += len;
258
259	if (out->p == out->end)
260	{
261	int delay_bytes;
262	unsigned long delay_us;
263	audio_buf_info info;
264
265	if (in_esddsp)
266	{
267	/* EsounD has no way of querying buffer status, so we have to
268	* go with a fixed size. */
269	delay_bytes = out->size;
270	}
271	else
272	{
273	#ifdef SNDCTL_DSP_GETODELAY
274	delay_bytes = 0;
275	if (ioctl(g_dsp_fd, SNDCTL_DSP_GETODELAY, &delay_bytes) == -1)
276	delay_bytes = -1;
277	#else
278	delay_bytes = -1;
279	#endif
280
281	if (delay_bytes == -1)
282	{
283	if (ioctl(g_dsp_fd, SNDCTL_DSP_GETOSPACE, &info) != -1)
284	delay_bytes = info.fragstotal * info.fragsize - info.bytes;
285	else
286	delay_bytes = out->size;
287	}
288	}
289
290	delay_us = delay_bytes * (1000000 / (samplewidth * snd_rate));
291	rdpsnd_queue_next(delay_us);
292	}
293	else
294	{
295	g_dsp_busy = 1;
296	}
297
298	return;
299	}
300
301	static struct audio_driver oss_driver = {
302	.name = "oss",
303	.description = "OSS output driver, default device: " DEFAULTDEVICE " or $AUDIODEV",
304
305	.wave_out_open = oss_open,
306	.wave_out_close = oss_close,
307	.wave_out_format_supported = oss_format_supported,
308	.wave_out_set_format = oss_set_format,
309	.wave_out_volume = oss_volume,
310	.wave_out_play = oss_play,
311
312	.need_byteswap_on_be = 0,
313	.need_resampling = 0,
314	};
315
316	struct audio_driver *
317	oss_register(char *options)
318	{
319	if (options)
320	{
321	dsp_dev = xstrdup(options);
322	}
323	else
324	{
325	dsp_dev = getenv("AUDIODEV");
326
327	if (dsp_dev == NULL)
328	{
329	dsp_dev = xstrdup(DEFAULTDEVICE);
330	}
331	}
332
333	return &oss_driver;
334	}