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	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	ossman_	1302	static BOOL in_esddsp;
50	matthewc	475
51	ossman_	1345	/* This is a just a forward declaration */
52			static struct audio_driver oss_driver;
53
54	ossman_	1302	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	matthewc	475	BOOL
77	stargo	1255	oss_open(void)
78	matthewc	475	{
79	stargo	1247	if ((g_dsp_fd = open(dsp_dev, O_WRONLY)) == -1)
80	matthewc	475	{
81			perror(dsp_dev);
82			return False;
83			}
84
85	ossman_	1302	in_esddsp = detect_esddsp();
86
87	matthewc	475	return True;
88			}
89
90			void
91	stargo	1255	oss_close(void)
92	matthewc	475	{
93			close(g_dsp_fd);
94	astrand	1318	g_dsp_busy = 0;
95	matthewc	475	}
96
97			BOOL
98	stargo	1255	oss_format_supported(WAVEFORMATEX * pwfx)
99	matthewc	475	{
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	stargo	1255	oss_set_format(WAVEFORMATEX * pwfx)
112	matthewc	475	{
113	stargo	761	int stereo, format, fragments;
114	stargo	1247	static BOOL driver_broken = False;
115	matthewc	475
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	stargo	1247	samplewidth = pwfx->wBitsPerSample / 8;
125	stargo	510
126	matthewc	475	if (ioctl(g_dsp_fd, SNDCTL_DSP_SETFMT, &format) == -1)
127			{
128			perror("SNDCTL_DSP_SETFMT");
129	astrand	1318	oss_close();
130	matthewc	475	return False;
131			}
132
133	stargo	760	if (pwfx->nChannels == 2)
134	matthewc	475	{
135	stargo	760	stereo = 1;
136	stargo	1247	samplewidth *= 2;
137	stargo	760	}
138			else
139			{
140			stereo = 0;
141			}
142
143			if (ioctl(g_dsp_fd, SNDCTL_DSP_STEREO, &stereo) == -1)
144			{
145	matthewc	475	perror("SNDCTL_DSP_CHANNELS");
146	astrand	1318	oss_close();
147	matthewc	475	return False;
148			}
149
150	stargo	1286	oss_driver.need_resampling = 0;
151	stargo	1247	snd_rate = pwfx->nSamplesPerSec;
152			if (ioctl(g_dsp_fd, SNDCTL_DSP_SPEED, &snd_rate) == -1)
153	stargo	510	{
154	stargo	1286	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	astrand	1318	oss_close();
169	stargo	1286	return False;
170			}
171
172			break;
173			}
174			prates++;
175			}
176
177			if (*prates == 0)
178			{
179			perror("SNDCTL_DSP_SPEED");
180	astrand	1318	oss_close();
181	stargo	1286	return False;
182			}
183	matthewc	475	}
184
185	stargo	1247	/* try to get 12 fragments of 2^12 bytes size */
186			fragments = (12 << 16) + 12;
187	stargo	761	ioctl(g_dsp_fd, SNDCTL_DSP_SETFRAGMENT, &fragments);
188
189	stargo	1247	if (!driver_broken)
190	stargo	761	{
191			audio_buf_info info;
192
193	astrand	801	memset(&info, 0, sizeof(info));
194	stargo	761	if (ioctl(g_dsp_fd, SNDCTL_DSP_GETOSPACE, &info) == -1)
195			{
196			perror("SNDCTL_DSP_GETOSPACE");
197	astrand	1318	oss_close();
198	stargo	761	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	stargo	1247	driver_broken = True;
207	stargo	761	}
208			}
209
210	matthewc	475	return True;
211			}
212
213			void
214	stargo	1255	oss_volume(uint16 left, uint16 right)
215	stargo	491	{
216			uint32 volume;
217
218	astrand	499	volume = left / (65536 / 100);
219			volume \|= right / (65536 / 100) << 8;
220	stargo	509
221	stargo	491	if (ioctl(g_dsp_fd, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
222			{
223	stargo	1275	warning("hardware volume control unavailable, falling back to software volume control!\n");
224	stargo	1269	oss_driver.wave_out_volume = rdpsnd_dsp_softvol_set;
225	stargo	1275	rdpsnd_dsp_softvol_set(left, right);
226	stargo	491	return;
227			}
228			}
229
230			void
231	stargo	1255	oss_play(void)
232	matthewc	475	{
233			struct audio_packet *packet;
234			ssize_t len;
235			STREAM out;
236
237	stargo	1254	if (rdpsnd_queue_empty())
238	matthewc	475	{
239	stargo	1247	g_dsp_busy = 0;
240			return;
241			}
242	matthewc	475
243	stargo	1254	packet = rdpsnd_queue_current_packet();
244	stargo	1247	out = &packet->s;
245	matthewc	475
246	stargo	1247	len = out->end - out->p;
247	stargo	761
248	stargo	1247	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	stargo	761
257	stargo	1247	out->p += len;
258	ossman_	1302
259	stargo	1247	if (out->p == out->end)
260			{
261	ossman_	1302	int delay_bytes;
262			unsigned long delay_us;
263			audio_buf_info info;
264	stargo	761
265	ossman_	1302	if (in_esddsp)
266	matthewc	475	{
267	ossman_	1302	/* EsounD has no way of querying buffer status, so we have to
268			* go with a fixed size. */
269			delay_bytes = out->size;
270	stargo	1247	}
271			else
272			{
273	ossman_	1302	#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	matthewc	475	}
289	ossman_	1302
290			delay_us = delay_bytes * (1000000 / (samplewidth * snd_rate));
291			rdpsnd_queue_next(delay_us);
292	matthewc	475	}
293	ossman_	1302	else
294			{
295			g_dsp_busy = 1;
296			}
297
298	stargo	1247	return;
299	matthewc	475	}
300	stargo	1255
301	ossman_	1345	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	stargo	1255	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			}