rdesktop/trunk/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);
        }
}

struct audio_driver *
oss_register(char *options)
{
        oss_driver.name = xstrdup("oss");
        oss_driver.description =
                xstrdup("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;
        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.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 = xstrdup(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			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	astrand	1227	/*
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	matthewc	475	#include "rdesktop.h"
31	stargo	1254	#include "rdpsnd.h"
32	stargo	1269	#include "rdpsnd_dsp.h"
33	matthewc	475	#include <unistd.h>
34			#include <fcntl.h>
35			#include <errno.h>
36	ossman_	1302	#include <unistd.h>
37	stargo	510	#include <sys/time.h>
38	matthewc	475	#include <sys/ioctl.h>
39			#include <sys/soundcard.h>
40	ossman_	1302	#include <sys/types.h>
41			#include <sys/stat.h>
42	matthewc	475
43	stargo	1254	#define DEFAULTDEVICE "/dev/dsp"
44	stargo	1247	#define MAX_LEN 512
45	matthewc	475
46	ossman_	1346	static int dsp_fd = -1;
47			static BOOL dsp_busy;
48
49	stargo	1247	static int snd_rate;
50			static short samplewidth;
51	stargo	1255	static char *dsp_dev;
52	ossman_	1302	static BOOL in_esddsp;
53	matthewc	475
54	ossman_	1345	/* This is a just a forward declaration */
55			static struct audio_driver oss_driver;
56
57	ossman_	1346	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	ossman_	1302	static BOOL
81			detect_esddsp(void)
82			{
83			struct stat s;
84			char *preload;
85
86	ossman_	1346	if (fstat(dsp_fd, &s) == -1)
87	ossman_	1302	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	matthewc	475	BOOL
103	stargo	1255	oss_open(void)
104	matthewc	475	{
105	ossman_	1346	if ((dsp_fd = open(dsp_dev, O_WRONLY)) == -1)
106	matthewc	475	{
107			perror(dsp_dev);
108			return False;
109			}
110
111	ossman_	1302	in_esddsp = detect_esddsp();
112
113	matthewc	475	return True;
114			}
115
116			void
117	stargo	1255	oss_close(void)
118	matthewc	475	{
119	ossman_	1346	close(dsp_fd);
120			dsp_fd = -1;
121			dsp_busy = False;
122	matthewc	475	}
123
124			BOOL
125	stargo	1255	oss_format_supported(WAVEFORMATEX * pwfx)
126	matthewc	475	{
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	stargo	1255	oss_set_format(WAVEFORMATEX * pwfx)
139	matthewc	475	{
140	stargo	761	int stereo, format, fragments;
141	stargo	1247	static BOOL driver_broken = False;
142	matthewc	475
143	ossman_	1346	ioctl(dsp_fd, SNDCTL_DSP_RESET, NULL);
144			ioctl(dsp_fd, SNDCTL_DSP_SYNC, NULL);
145	matthewc	475
146			if (pwfx->wBitsPerSample == 8)
147			format = AFMT_U8;
148			else if (pwfx->wBitsPerSample == 16)
149			format = AFMT_S16_LE;
150
151	stargo	1247	samplewidth = pwfx->wBitsPerSample / 8;
152	stargo	510
153	ossman_	1346	if (ioctl(dsp_fd, SNDCTL_DSP_SETFMT, &format) == -1)
154	matthewc	475	{
155			perror("SNDCTL_DSP_SETFMT");
156	astrand	1318	oss_close();
157	matthewc	475	return False;
158			}
159
160	stargo	760	if (pwfx->nChannels == 2)
161	matthewc	475	{
162	stargo	760	stereo = 1;
163	stargo	1247	samplewidth *= 2;
164	stargo	760	}
165			else
166			{
167			stereo = 0;
168			}
169
170	ossman_	1346	if (ioctl(dsp_fd, SNDCTL_DSP_STEREO, &stereo) == -1)
171	stargo	760	{
172	matthewc	475	perror("SNDCTL_DSP_CHANNELS");
173	astrand	1318	oss_close();
174	matthewc	475	return False;
175			}
176
177	stargo	1286	oss_driver.need_resampling = 0;
178	stargo	1247	snd_rate = pwfx->nSamplesPerSec;
179	ossman_	1346	if (ioctl(dsp_fd, SNDCTL_DSP_SPEED, &snd_rate) == -1)
180	stargo	510	{
181	stargo	1286	int rates[] = { 44100, 48000, 0 };
182			int *prates = rates;
183
184			while (*prates != 0)
185			{
186			if ((pwfx->nSamplesPerSec != *prates)
187	ossman_	1346	&& (ioctl(dsp_fd, SNDCTL_DSP_SPEED, prates) != -1))
188	stargo	1286	{
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	astrand	1318	oss_close();
196	stargo	1286	return False;
197			}
198
199			break;
200			}
201			prates++;
202			}
203
204			if (*prates == 0)
205			{
206			perror("SNDCTL_DSP_SPEED");
207	astrand	1318	oss_close();
208	stargo	1286	return False;
209			}
210	matthewc	475	}
211
212	stargo	1247	/* try to get 12 fragments of 2^12 bytes size */
213			fragments = (12 << 16) + 12;
214	ossman_	1346	ioctl(dsp_fd, SNDCTL_DSP_SETFRAGMENT, &fragments);
215	stargo	761
216	stargo	1247	if (!driver_broken)
217	stargo	761	{
218			audio_buf_info info;
219
220	astrand	801	memset(&info, 0, sizeof(info));
221	ossman_	1346	if (ioctl(dsp_fd, SNDCTL_DSP_GETOSPACE, &info) == -1)
222	stargo	761	{
223			perror("SNDCTL_DSP_GETOSPACE");
224	astrand	1318	oss_close();
225	stargo	761	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	stargo	1247	driver_broken = True;
234	stargo	761	}
235			}
236
237	matthewc	475	return True;
238			}
239
240			void
241	stargo	1255	oss_volume(uint16 left, uint16 right)
242	stargo	491	{
243			uint32 volume;
244
245	astrand	499	volume = left / (65536 / 100);
246			volume \|= right / (65536 / 100) << 8;
247	stargo	509
248	ossman_	1346	if (ioctl(dsp_fd, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
249	stargo	491	{
250	stargo	1275	warning("hardware volume control unavailable, falling back to software volume control!\n");
251	stargo	1269	oss_driver.wave_out_volume = rdpsnd_dsp_softvol_set;
252	stargo	1275	rdpsnd_dsp_softvol_set(left, right);
253	stargo	491	return;
254			}
255			}
256
257			void
258	stargo	1255	oss_play(void)
259	matthewc	475	{
260			struct audio_packet *packet;
261			ssize_t len;
262			STREAM out;
263
264	ossman_	1346	/* We shouldn't be called if the queue is empty, but still */
265	stargo	1254	if (rdpsnd_queue_empty())
266	stargo	1247	return;
267	matthewc	475
268	stargo	1254	packet = rdpsnd_queue_current_packet();
269	stargo	1247	out = &packet->s;
270	matthewc	475
271	stargo	1247	len = out->end - out->p;
272	stargo	761
273	ossman_	1346	len = write(dsp_fd, out->p, (len > MAX_LEN) ? MAX_LEN : len);
274	stargo	1247	if (len == -1)
275			{
276			if (errno != EWOULDBLOCK)
277			perror("write audio");
278			return;
279			}
280	stargo	761
281	stargo	1247	out->p += len;
282	ossman_	1302
283	stargo	1247	if (out->p == out->end)
284			{
285	ossman_	1302	int delay_bytes;
286			unsigned long delay_us;
287			audio_buf_info info;
288	stargo	761
289	ossman_	1302	if (in_esddsp)
290	matthewc	475	{
291	ossman_	1302	/* EsounD has no way of querying buffer status, so we have to
292			* go with a fixed size. */
293			delay_bytes = out->size;
294	stargo	1247	}
295			else
296			{
297	ossman_	1302	#ifdef SNDCTL_DSP_GETODELAY
298			delay_bytes = 0;
299	ossman_	1346	if (ioctl(dsp_fd, SNDCTL_DSP_GETODELAY, &delay_bytes) == -1)
300	ossman_	1302	delay_bytes = -1;
301			#else
302			delay_bytes = -1;
303			#endif
304
305			if (delay_bytes == -1)
306			{
307	ossman_	1346	if (ioctl(dsp_fd, SNDCTL_DSP_GETOSPACE, &info) != -1)
308	ossman_	1302	delay_bytes = info.fragstotal * info.fragsize - info.bytes;
309			else
310			delay_bytes = out->size;
311			}
312	matthewc	475	}
313	ossman_	1302
314			delay_us = delay_bytes * (1000000 / (samplewidth * snd_rate));
315			rdpsnd_queue_next(delay_us);
316	matthewc	475	}
317			}
318	stargo	1255
319	stargo	1351	struct audio_driver *
320			oss_register(char *options)
321			{
322			oss_driver.name = xstrdup("oss");
323			oss_driver.description =
324			xstrdup("OSS output driver, default device: " DEFAULTDEVICE " or $AUDIODEV");
325	ossman_	1345
326	stargo	1351	oss_driver.add_fds = oss_add_fds;
327			oss_driver.check_fds = oss_check_fds;
328	ossman_	1346
329	stargo	1351	oss_driver.wave_out_open = oss_open;
330			oss_driver.wave_out_close = oss_close;
331			oss_driver.wave_out_format_supported = oss_format_supported;
332			oss_driver.wave_out_set_format = oss_set_format;
333			oss_driver.wave_out_volume = oss_volume;
334	ossman_	1345
335	stargo	1351	oss_driver.need_byteswap_on_be = 0;
336			oss_driver.need_resampling = 0;
337	ossman_	1345
338	stargo	1255	if (options)
339			{
340			dsp_dev = xstrdup(options);
341			}
342			else
343			{
344			dsp_dev = getenv("AUDIODEV");
345
346			if (dsp_dev == NULL)
347			{
348			dsp_dev = xstrdup(DEFAULTDEVICE);
349			}
350			}
351
352			return &oss_driver;
353			}