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);
}

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");
                close(g_dsp_fd);
                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");
                close(g_dsp_fd);
                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");
                                        close(g_dsp_fd);
                                        return False;
                                }

                                break;
                        }
                        prates++;
                }

                if (*prates == 0)
                {
                        perror("SNDCTL_DSP_SPEED");
                        close(g_dsp_fd);
                        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");
                        close(g_dsp_fd);
                        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	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	stargo	1247	static int snd_rate;
47			static short samplewidth;
48	stargo	1255	static char *dsp_dev;
49	stargo	1269	static struct audio_driver oss_driver;
50	ossman_	1302	static BOOL in_esddsp;
51	matthewc	475
52	ossman_	1302	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	matthewc	475	BOOL
75	stargo	1255	oss_open(void)
76	matthewc	475	{
77	stargo	1247	if ((g_dsp_fd = open(dsp_dev, O_WRONLY)) == -1)
78	matthewc	475	{
79			perror(dsp_dev);
80			return False;
81			}
82
83	ossman_	1302	in_esddsp = detect_esddsp();
84
85	matthewc	475	return True;
86			}
87
88			void
89	stargo	1255	oss_close(void)
90	matthewc	475	{
91			close(g_dsp_fd);
92			}
93
94			BOOL
95	stargo	1255	oss_format_supported(WAVEFORMATEX * pwfx)
96	matthewc	475	{
97			if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
98			return False;
99			if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))
100			return False;
101			if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))
102			return False;
103
104			return True;
105			}
106
107			BOOL
108	stargo	1255	oss_set_format(WAVEFORMATEX * pwfx)
109	matthewc	475	{
110	stargo	761	int stereo, format, fragments;
111	stargo	1247	static BOOL driver_broken = False;
112	matthewc	475
113			ioctl(g_dsp_fd, SNDCTL_DSP_RESET, NULL);
114			ioctl(g_dsp_fd, SNDCTL_DSP_SYNC, NULL);
115
116			if (pwfx->wBitsPerSample == 8)
117			format = AFMT_U8;
118			else if (pwfx->wBitsPerSample == 16)
119			format = AFMT_S16_LE;
120
121	stargo	1247	samplewidth = pwfx->wBitsPerSample / 8;
122	stargo	510
123	matthewc	475	if (ioctl(g_dsp_fd, SNDCTL_DSP_SETFMT, &format) == -1)
124			{
125			perror("SNDCTL_DSP_SETFMT");
126			close(g_dsp_fd);
127			return False;
128			}
129
130	stargo	760	if (pwfx->nChannels == 2)
131	matthewc	475	{
132	stargo	760	stereo = 1;
133	stargo	1247	samplewidth *= 2;
134	stargo	760	}
135			else
136			{
137			stereo = 0;
138			}
139
140			if (ioctl(g_dsp_fd, SNDCTL_DSP_STEREO, &stereo) == -1)
141			{
142	matthewc	475	perror("SNDCTL_DSP_CHANNELS");
143			close(g_dsp_fd);
144			return False;
145			}
146
147	stargo	1286	oss_driver.need_resampling = 0;
148	stargo	1247	snd_rate = pwfx->nSamplesPerSec;
149			if (ioctl(g_dsp_fd, SNDCTL_DSP_SPEED, &snd_rate) == -1)
150	stargo	510	{
151	stargo	1286	int rates[] = { 44100, 48000, 0 };
152			int *prates = rates;
153
154			while (*prates != 0)
155			{
156			if ((pwfx->nSamplesPerSec != *prates)
157			&& (ioctl(g_dsp_fd, SNDCTL_DSP_SPEED, prates) != -1))
158			{
159			oss_driver.need_resampling = 1;
160			snd_rate = *prates;
161			if (rdpsnd_dsp_resample_set
162			(snd_rate, pwfx->wBitsPerSample, pwfx->nChannels) == False)
163			{
164			error("rdpsnd_dsp_resample_set failed");
165			close(g_dsp_fd);
166			return False;
167			}
168
169			break;
170			}
171			prates++;
172			}
173
174			if (*prates == 0)
175			{
176			perror("SNDCTL_DSP_SPEED");
177			close(g_dsp_fd);
178			return False;
179			}
180	matthewc	475	}
181
182	stargo	1247	/* try to get 12 fragments of 2^12 bytes size */
183			fragments = (12 << 16) + 12;
184	stargo	761	ioctl(g_dsp_fd, SNDCTL_DSP_SETFRAGMENT, &fragments);
185
186	stargo	1247	if (!driver_broken)
187	stargo	761	{
188			audio_buf_info info;
189
190	astrand	801	memset(&info, 0, sizeof(info));
191	stargo	761	if (ioctl(g_dsp_fd, SNDCTL_DSP_GETOSPACE, &info) == -1)
192			{
193			perror("SNDCTL_DSP_GETOSPACE");
194			close(g_dsp_fd);
195			return False;
196			}
197
198			if (info.fragments == 0 \|\| info.fragstotal == 0 \|\| info.fragsize == 0)
199			{
200			fprintf(stderr,
201			"Broken OSS-driver detected: fragments: %d, fragstotal: %d, fragsize: %d\n",
202			info.fragments, info.fragstotal, info.fragsize);
203	stargo	1247	driver_broken = True;
204	stargo	761	}
205			}
206
207	matthewc	475	return True;
208			}
209
210			void
211	stargo	1255	oss_volume(uint16 left, uint16 right)
212	stargo	491	{
213			uint32 volume;
214
215	astrand	499	volume = left / (65536 / 100);
216			volume \|= right / (65536 / 100) << 8;
217	stargo	509
218	stargo	491	if (ioctl(g_dsp_fd, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
219			{
220	stargo	1275	warning("hardware volume control unavailable, falling back to software volume control!\n");
221	stargo	1269	oss_driver.wave_out_volume = rdpsnd_dsp_softvol_set;
222	stargo	1275	rdpsnd_dsp_softvol_set(left, right);
223	stargo	491	return;
224			}
225			}
226
227			void
228	stargo	1255	oss_play(void)
229	matthewc	475	{
230			struct audio_packet *packet;
231			ssize_t len;
232			STREAM out;
233
234	stargo	1254	if (rdpsnd_queue_empty())
235	matthewc	475	{
236	stargo	1247	g_dsp_busy = 0;
237			return;
238			}
239	matthewc	475
240	stargo	1254	packet = rdpsnd_queue_current_packet();
241	stargo	1247	out = &packet->s;
242	matthewc	475
243	stargo	1247	len = out->end - out->p;
244	stargo	761
245	stargo	1247	len = write(g_dsp_fd, out->p, (len > MAX_LEN) ? MAX_LEN : len);
246			if (len == -1)
247			{
248			if (errno != EWOULDBLOCK)
249			perror("write audio");
250			g_dsp_busy = 1;
251			return;
252			}
253	stargo	761
254	stargo	1247	out->p += len;
255	ossman_	1302
256	stargo	1247	if (out->p == out->end)
257			{
258	ossman_	1302	int delay_bytes;
259			unsigned long delay_us;
260			audio_buf_info info;
261	stargo	761
262	ossman_	1302	if (in_esddsp)
263	matthewc	475	{
264	ossman_	1302	/* EsounD has no way of querying buffer status, so we have to
265			* go with a fixed size. */
266			delay_bytes = out->size;
267	stargo	1247	}
268			else
269			{
270	ossman_	1302	#ifdef SNDCTL_DSP_GETODELAY
271			delay_bytes = 0;
272			if (ioctl(g_dsp_fd, SNDCTL_DSP_GETODELAY, &delay_bytes) == -1)
273			delay_bytes = -1;
274			#else
275			delay_bytes = -1;
276			#endif
277
278			if (delay_bytes == -1)
279			{
280			if (ioctl(g_dsp_fd, SNDCTL_DSP_GETOSPACE, &info) != -1)
281			delay_bytes = info.fragstotal * info.fragsize - info.bytes;
282			else
283			delay_bytes = out->size;
284			}
285	matthewc	475	}
286	ossman_	1302
287			delay_us = delay_bytes * (1000000 / (samplewidth * snd_rate));
288			rdpsnd_queue_next(delay_us);
289	matthewc	475	}
290	ossman_	1302	else
291			{
292			g_dsp_busy = 1;
293			}
294
295	stargo	1247	return;
296	matthewc	475	}
297	stargo	1255
298			struct audio_driver *
299			oss_register(char *options)
300			{
301	stargo	1256	oss_driver.wave_out_open = oss_open;
302			oss_driver.wave_out_close = oss_close;
303			oss_driver.wave_out_format_supported = oss_format_supported;
304			oss_driver.wave_out_set_format = oss_set_format;
305			oss_driver.wave_out_volume = oss_volume;
306			oss_driver.wave_out_play = oss_play;
307			oss_driver.name = xstrdup("oss");
308			oss_driver.description =
309			xstrdup("OSS output driver, default device: " DEFAULTDEVICE " or $AUDIODEV");
310	stargo	1260	oss_driver.need_byteswap_on_be = 0;
311	stargo	1279	oss_driver.need_resampling = 0;
312	stargo	1256	oss_driver.next = NULL;
313
314	stargo	1255	if (options)
315			{
316			dsp_dev = xstrdup(options);
317			}
318			else
319			{
320			dsp_dev = getenv("AUDIODEV");
321
322			if (dsp_dev == NULL)
323			{
324			dsp_dev = xstrdup(DEFAULTDEVICE);
325			}
326			}
327
328			return &oss_driver;
329			}