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 <sys/time.h>
#include <sys/ioctl.h>
#include <sys/soundcard.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;

BOOL
oss_open(void)
{
        if ((g_dsp_fd = open(dsp_dev, O_WRONLY)) == -1)
        {
                perror(dsp_dev);
                return False;
        }

        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;
        static long startedat_us;
        static long startedat_s;
        static BOOL started = False;
        struct timeval tv;

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

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

        if (!started)
        {
                gettimeofday(&tv, NULL);
                startedat_us = tv.tv_usec;
                startedat_s = tv.tv_sec;
                started = True;
        }

        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)
        {
                long long duration;
                long elapsed;

                gettimeofday(&tv, NULL);
                duration = (out->size * (1000000 / (samplewidth * snd_rate)));
                elapsed = (tv.tv_sec - startedat_s) * 1000000 + (tv.tv_usec - startedat_us);

                if (elapsed >= (duration * 85) / 100)
                {
                        /* We need to add 50 to tell windows that time has passed while
                         * playing this packet */
                        rdpsnd_send_completion(packet->tick + 50, packet->index);
                        rdpsnd_queue_next();
                        started = False;
                }
                else
                {
                        g_dsp_busy = 1;
                        return;
                }
        }
        g_dsp_busy = 1;
        return;
}

struct audio_driver *
oss_register(char *options)
{
        oss_driver.wave_out_write = rdpsnd_queue_write;
        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 <sys/time.h>
37	#include <sys/ioctl.h>
38	#include <sys/soundcard.h>
39
40	#define DEFAULTDEVICE "/dev/dsp"
41	#define MAX_LEN 512
42
43	static int snd_rate;
44	static short samplewidth;
45	static char *dsp_dev;
46	static struct audio_driver oss_driver;
47
48	BOOL
49	oss_open(void)
50	{
51	if ((g_dsp_fd = open(dsp_dev, O_WRONLY)) == -1)
52	{
53	perror(dsp_dev);
54	return False;
55	}
56
57	return True;
58	}
59
60	void
61	oss_close(void)
62	{
63	close(g_dsp_fd);
64	}
65
66	BOOL
67	oss_format_supported(WAVEFORMATEX * pwfx)
68	{
69	if (pwfx->wFormatTag != WAVE_FORMAT_PCM)
70	return False;
71	if ((pwfx->nChannels != 1) && (pwfx->nChannels != 2))
72	return False;
73	if ((pwfx->wBitsPerSample != 8) && (pwfx->wBitsPerSample != 16))
74	return False;
75
76	return True;
77	}
78
79	BOOL
80	oss_set_format(WAVEFORMATEX * pwfx)
81	{
82	int stereo, format, fragments;
83	static BOOL driver_broken = False;
84
85	ioctl(g_dsp_fd, SNDCTL_DSP_RESET, NULL);
86	ioctl(g_dsp_fd, SNDCTL_DSP_SYNC, NULL);
87
88	if (pwfx->wBitsPerSample == 8)
89	format = AFMT_U8;
90	else if (pwfx->wBitsPerSample == 16)
91	format = AFMT_S16_LE;
92
93	samplewidth = pwfx->wBitsPerSample / 8;
94
95	if (ioctl(g_dsp_fd, SNDCTL_DSP_SETFMT, &format) == -1)
96	{
97	perror("SNDCTL_DSP_SETFMT");
98	close(g_dsp_fd);
99	return False;
100	}
101
102	if (pwfx->nChannels == 2)
103	{
104	stereo = 1;
105	samplewidth *= 2;
106	}
107	else
108	{
109	stereo = 0;
110	}
111
112	if (ioctl(g_dsp_fd, SNDCTL_DSP_STEREO, &stereo) == -1)
113	{
114	perror("SNDCTL_DSP_CHANNELS");
115	close(g_dsp_fd);
116	return False;
117	}
118
119	oss_driver.need_resampling = 0;
120	snd_rate = pwfx->nSamplesPerSec;
121	if (ioctl(g_dsp_fd, SNDCTL_DSP_SPEED, &snd_rate) == -1)
122	{
123	int rates[] = { 44100, 48000, 0 };
124	int *prates = rates;
125
126	while (*prates != 0)
127	{
128	if ((pwfx->nSamplesPerSec != *prates)
129	&& (ioctl(g_dsp_fd, SNDCTL_DSP_SPEED, prates) != -1))
130	{
131	oss_driver.need_resampling = 1;
132	snd_rate = *prates;
133	if (rdpsnd_dsp_resample_set
134	(snd_rate, pwfx->wBitsPerSample, pwfx->nChannels) == False)
135	{
136	error("rdpsnd_dsp_resample_set failed");
137	close(g_dsp_fd);
138	return False;
139	}
140
141	break;
142	}
143	prates++;
144	}
145
146	if (*prates == 0)
147	{
148	perror("SNDCTL_DSP_SPEED");
149	close(g_dsp_fd);
150	return False;
151	}
152	}
153
154	/* try to get 12 fragments of 2^12 bytes size */
155	fragments = (12 << 16) + 12;
156	ioctl(g_dsp_fd, SNDCTL_DSP_SETFRAGMENT, &fragments);
157
158	if (!driver_broken)
159	{
160	audio_buf_info info;
161
162	memset(&info, 0, sizeof(info));
163	if (ioctl(g_dsp_fd, SNDCTL_DSP_GETOSPACE, &info) == -1)
164	{
165	perror("SNDCTL_DSP_GETOSPACE");
166	close(g_dsp_fd);
167	return False;
168	}
169
170	if (info.fragments == 0 \|\| info.fragstotal == 0 \|\| info.fragsize == 0)
171	{
172	fprintf(stderr,
173	"Broken OSS-driver detected: fragments: %d, fragstotal: %d, fragsize: %d\n",
174	info.fragments, info.fragstotal, info.fragsize);
175	driver_broken = True;
176	}
177	}
178
179	return True;
180	}
181
182	void
183	oss_volume(uint16 left, uint16 right)
184	{
185	uint32 volume;
186
187	volume = left / (65536 / 100);
188	volume \|= right / (65536 / 100) << 8;
189
190	if (ioctl(g_dsp_fd, MIXER_WRITE(SOUND_MIXER_PCM), &volume) == -1)
191	{
192	warning("hardware volume control unavailable, falling back to software volume control!\n");
193	oss_driver.wave_out_volume = rdpsnd_dsp_softvol_set;
194	rdpsnd_dsp_softvol_set(left, right);
195	return;
196	}
197	}
198
199	void
200	oss_play(void)
201	{
202	struct audio_packet *packet;
203	ssize_t len;
204	STREAM out;
205	static long startedat_us;
206	static long startedat_s;
207	static BOOL started = False;
208	struct timeval tv;
209
210	if (rdpsnd_queue_empty())
211	{
212	g_dsp_busy = 0;
213	return;
214	}
215
216	packet = rdpsnd_queue_current_packet();
217	out = &packet->s;
218
219	if (!started)
220	{
221	gettimeofday(&tv, NULL);
222	startedat_us = tv.tv_usec;
223	startedat_s = tv.tv_sec;
224	started = True;
225	}
226
227	len = out->end - out->p;
228
229	len = write(g_dsp_fd, out->p, (len > MAX_LEN) ? MAX_LEN : len);
230	if (len == -1)
231	{
232	if (errno != EWOULDBLOCK)
233	perror("write audio");
234	g_dsp_busy = 1;
235	return;
236	}
237
238	out->p += len;
239	if (out->p == out->end)
240	{
241	long long duration;
242	long elapsed;
243
244	gettimeofday(&tv, NULL);
245	duration = (out->size * (1000000 / (samplewidth * snd_rate)));
246	elapsed = (tv.tv_sec - startedat_s) * 1000000 + (tv.tv_usec - startedat_us);
247
248	if (elapsed >= (duration * 85) / 100)
249	{
250	/* We need to add 50 to tell windows that time has passed while
251	* playing this packet */
252	rdpsnd_send_completion(packet->tick + 50, packet->index);
253	rdpsnd_queue_next();
254	started = False;
255	}
256	else
257	{
258	g_dsp_busy = 1;
259	return;
260	}
261	}
262	g_dsp_busy = 1;
263	return;
264	}
265
266	struct audio_driver *
267	oss_register(char *options)
268	{
269	oss_driver.wave_out_write = rdpsnd_queue_write;
270	oss_driver.wave_out_open = oss_open;
271	oss_driver.wave_out_close = oss_close;
272	oss_driver.wave_out_format_supported = oss_format_supported;
273	oss_driver.wave_out_set_format = oss_set_format;
274	oss_driver.wave_out_volume = oss_volume;
275	oss_driver.wave_out_play = oss_play;
276	oss_driver.name = xstrdup("oss");
277	oss_driver.description =
278	xstrdup("OSS output driver, default device: " DEFAULTDEVICE " or $AUDIODEV");
279	oss_driver.need_byteswap_on_be = 0;
280	oss_driver.need_resampling = 0;
281	oss_driver.next = NULL;
282
283	if (options)
284	{
285	dsp_dev = xstrdup(options);
286	}
287	else
288	{
289	dsp_dev = getenv("AUDIODEV");
290
291	if (dsp_dev == NULL)
292	{
293	dsp_dev = xstrdup(DEFAULTDEVICE);
294	}
295	}
296
297	return &oss_driver;
298	}