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 struct audio_driver oss_driver;
static BOOL in_esddsp;

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;
}

struct audio_driver *
oss_register(char *options)
{
        oss_driver.wave_out_open = oss_open;
        oss_driver.wave_out_close = oss_close;
        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_out_play = oss_play;
        oss_driver.name = xstrdup("oss");
        oss_driver.description =
                xstrdup("OSS output driver, default device: " DEFAULTDEVICE " or $AUDIODEV");
        oss_driver.need_byteswap_on_be = 0;
        oss_driver.need_resampling = 0;
        oss_driver.next = NULL;

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