rdesktop/trunk/rdpsnd.c

/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.
   Sound Channel Process Functions
   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.
*/

#include "rdesktop.h"
#include "rdpsnd.h"
#include "rdpsnd_dsp.h"

#define RDPSND_CLOSE            1
#define RDPSND_WRITE            2
#define RDPSND_SET_VOLUME       3
#define RDPSND_UNKNOWN4         4
#define RDPSND_COMPLETION       5
#define RDPSND_SERVERTICK       6
#define RDPSND_NEGOTIATE        7

#define MAX_FORMATS             10
#define MAX_QUEUE               10

BOOL g_dsp_busy = False;
int g_dsp_fd;

static VCHANNEL *rdpsnd_channel;
static struct audio_driver *drivers = NULL;
struct audio_driver *current_driver = NULL;

static BOOL device_open;
static WAVEFORMATEX formats[MAX_FORMATS];
static unsigned int format_count;
static unsigned int current_format;
unsigned int queue_hi, queue_lo;
struct audio_packet packet_queue[MAX_QUEUE];

void (*wave_out_play) (void);

static STREAM
rdpsnd_init_packet(uint16 type, uint16 size)
{
        STREAM s;

        s = channel_init(rdpsnd_channel, size + 4);
        out_uint16_le(s, type);
        out_uint16_le(s, size);
        return s;
}

static void
rdpsnd_send(STREAM s)
{
#ifdef RDPSND_DEBUG
        printf("RDPSND send:\n");
        hexdump(s->channel_hdr + 8, s->end - s->channel_hdr - 8);
#endif

        channel_send(s, rdpsnd_channel);
}

void
rdpsnd_send_completion(uint16 tick, uint8 packet_index)
{
        STREAM s;

        s = rdpsnd_init_packet(RDPSND_COMPLETION, 4);
        out_uint16_le(s, tick);
        out_uint8(s, packet_index);
        out_uint8(s, 0);
        s_mark_end(s);
        rdpsnd_send(s);
}

static void
rdpsnd_process_negotiate(STREAM in)
{
        unsigned int in_format_count, i;
        WAVEFORMATEX *format;
        STREAM out;
        BOOL device_available = False;
        int readcnt;
        int discardcnt;

        in_uint8s(in, 14);      /* flags, volume, pitch, UDP port */
        in_uint16_le(in, in_format_count);
        in_uint8s(in, 4);       /* pad, status, pad */

        if (current_driver->wave_out_open())
        {
                current_driver->wave_out_close();
                device_available = True;
        }

        format_count = 0;
        if (s_check_rem(in, 18 * in_format_count))
        {
                for (i = 0; i < in_format_count; i++)
                {
                        format = &formats[format_count];
                        in_uint16_le(in, format->wFormatTag);
                        in_uint16_le(in, format->nChannels);
                        in_uint32_le(in, format->nSamplesPerSec);
                        in_uint32_le(in, format->nAvgBytesPerSec);
                        in_uint16_le(in, format->nBlockAlign);
                        in_uint16_le(in, format->wBitsPerSample);
                        in_uint16_le(in, format->cbSize);

                        /* read in the buffer of unknown use */
                        readcnt = format->cbSize;
                        discardcnt = 0;
                        if (format->cbSize > MAX_CBSIZE)
                        {
                                fprintf(stderr, "cbSize too large for buffer: %d\n",
                                        format->cbSize);
                                readcnt = MAX_CBSIZE;
                                discardcnt = format->cbSize - MAX_CBSIZE;
                        }
                        in_uint8a(in, format->cb, readcnt);
                        in_uint8s(in, discardcnt);

                        if (device_available && current_driver->wave_out_format_supported(format))
                        {
                                format_count++;
                                if (format_count == MAX_FORMATS)
                                        break;
                        }
                }
        }

        out = rdpsnd_init_packet(RDPSND_NEGOTIATE | 0x200, 20 + 18 * format_count);
        out_uint32_le(out, 3);  /* flags */
        out_uint32(out, 0xffffffff);    /* volume */
        out_uint32(out, 0);     /* pitch */
        out_uint16(out, 0);     /* UDP port */

        out_uint16_le(out, format_count);
        out_uint8(out, 0x95);   /* pad? */
        out_uint16_le(out, 2);  /* status */
        out_uint8(out, 0x77);   /* pad? */

        for (i = 0; i < format_count; i++)
        {
                format = &formats[i];
                out_uint16_le(out, format->wFormatTag);
                out_uint16_le(out, format->nChannels);
                out_uint32_le(out, format->nSamplesPerSec);
                out_uint32_le(out, format->nAvgBytesPerSec);
                out_uint16_le(out, format->nBlockAlign);
                out_uint16_le(out, format->wBitsPerSample);
                out_uint16(out, 0);     /* cbSize */
        }

        s_mark_end(out);
        rdpsnd_send(out);
}

static void
rdpsnd_process_servertick(STREAM in)
{
        uint16 tick1, tick2;
        STREAM out;

        /* in_uint8s(in, 4); unknown */
        in_uint16_le(in, tick1);
        in_uint16_le(in, tick2);

        out = rdpsnd_init_packet(RDPSND_SERVERTICK | 0x2300, 4);
        out_uint16_le(out, tick1);
        out_uint16_le(out, tick2);
        s_mark_end(out);
        rdpsnd_send(out);
}

static void
rdpsnd_process(STREAM s)
{
        uint8 type;
        uint16 datalen;
        uint32 volume;
        static uint16 tick, format;
        static uint8 packet_index;
        static BOOL awaiting_data_packet;
        static unsigned char missing_bytes[4] = { 0, 0, 0, 0 };

#ifdef RDPSND_DEBUG
        printf("RDPSND recv:\n");
        hexdump(s->p, s->end - s->p);
#endif

        if (awaiting_data_packet)
        {
                if (format >= MAX_FORMATS)
                {
                        error("RDPSND: Invalid format index\n");
                        return;
                }

                if (!device_open || (format != current_format))
                {
                        if (!device_open && !current_driver->wave_out_open())
                        {
                                rdpsnd_send_completion(tick, packet_index);
                                return;
                        }
                        if (!current_driver->wave_out_set_format(&formats[format]))
                        {
                                rdpsnd_send_completion(tick, packet_index);
                                current_driver->wave_out_close();
                                device_open = False;
                                return;
                        }
                        device_open = True;
                        current_format = format;
                }

                /* Insert the 4 missing bytes retrieved from last RDPSND_WRITE */
                memcpy(s->data, missing_bytes, 4);

                current_driver->
                        wave_out_write(rdpsnd_dsp_process
                                       (s, current_driver, &formats[current_format]), tick,
                                       packet_index);
                awaiting_data_packet = False;
                return;
        }

        in_uint8(s, type);
        in_uint8s(s, 1);        /* unknown? */
        in_uint16_le(s, datalen);

        switch (type)
        {
                case RDPSND_WRITE:
                        in_uint16_le(s, tick);
                        in_uint16_le(s, format);
                        in_uint8(s, packet_index);
                        /* Here are our lost bytes, but why? */
                        memcpy(missing_bytes, s->end - 4, 4);
                        awaiting_data_packet = True;
                        break;
                case RDPSND_CLOSE:
                        current_driver->wave_out_close();
                        device_open = False;
                        break;
                case RDPSND_NEGOTIATE:
                        rdpsnd_process_negotiate(s);
                        break;
                case RDPSND_SERVERTICK:
                        rdpsnd_process_servertick(s);
                        break;
                case RDPSND_SET_VOLUME:
                        in_uint32(s, volume);
                        if (device_open)
                        {
                                current_driver->wave_out_volume((volume & 0xffff),
                                                                (volume & 0xffff0000) >> 16);
                        }
                        break;
                default:
                        unimpl("RDPSND packet type %d\n", type);
                        break;
        }
}

inline BOOL
rdpsnd_auto_open(void)
{
        static BOOL failed = False;

        if (!failed)
        {
                struct audio_driver *auto_driver = current_driver;

                current_driver = drivers;
                while (current_driver != NULL)
                {
                        DEBUG(("trying %s...\n", current_driver->name));
                        if (current_driver->wave_out_open())
                        {
                                DEBUG(("selected %s\n", current_driver->name));
                                return True;
                        }
                        g_dsp_fd = 0;
                        current_driver = current_driver->next;
                }

                warning("no working audio-driver found\n");
                failed = True;
                current_driver = auto_driver;
        }

        return False;
}

inline void
rdpsnd_register_drivers(char *options)
{
        struct audio_driver **reg;

        /* The order of registrations define the probe-order
           when opening the device for the first time */
        reg = &drivers;
#if defined(RDPSND_ALSA)
        *reg = alsa_register(options);
        reg = &((*reg)->next);
#endif
#if defined(RDPSND_SUN)
        *reg = sun_register(options);
        reg = &((*reg)->next);
#endif
#if defined(RDPSND_OSS)
        *reg = oss_register(options);
        reg = &((*reg)->next);
#endif
#if defined(RDPSND_SGI)
        *reg = sgi_register(options);
        reg = &((*reg)->next);
#endif
#if defined(RDPSND_LIBAO)
        *reg = libao_register(options);
        reg = &((*reg)->next);
#endif
}

BOOL
rdpsnd_init(char *optarg)
{
        static struct audio_driver auto_driver;
        struct audio_driver *pos;
        char *driver = NULL, *options = NULL;

        drivers = NULL;

        rdpsnd_channel =
                channel_register("rdpsnd", CHANNEL_OPTION_INITIALIZED | CHANNEL_OPTION_ENCRYPT_RDP,
                                 rdpsnd_process);

        if (rdpsnd_channel == NULL)
        {
                error("channel_register\n");
                return False;
        }

        if (optarg != NULL && strlen(optarg) > 0)
        {
                driver = options = optarg;

                while (*options != '\0' && *options != ':')
                        options++;

                if (*options == ':')
                {
                        *options = '\0';
                        options++;
                }

                if (*options == '\0')
                        options = NULL;
        }

        rdpsnd_register_drivers(options);

        if (!driver)
        {
                auto_driver.wave_out_open = &rdpsnd_auto_open;
                current_driver = &auto_driver;
                return True;
        }

        pos = drivers;
        while (pos != NULL)
        {
                if (!strcmp(pos->name, driver))
                {
                        DEBUG(("selected %s\n", pos->name));
                        current_driver = pos;
                        return True;
                }
                pos = pos->next;
        }
        return False;
}

void
rdpsnd_show_help(void)
{
        struct audio_driver *pos;

        rdpsnd_register_drivers(NULL);

        pos = drivers;
        while (pos != NULL)
        {
                fprintf(stderr, "                     %s:\t%s\n", pos->name, pos->description);
                pos = pos->next;
        }
}

void
rdpsnd_play(void)
{
        current_driver->wave_out_play();
}

inline void
rdpsnd_queue_write(STREAM s, uint16 tick, uint8 index)
{
        struct audio_packet *packet = &packet_queue[queue_hi];
        unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE;

        if (next_hi == queue_lo)
        {
                error("No space to queue audio packet\n");
                return;
        }

        queue_hi = next_hi;

        packet->s = *s;
        packet->tick = tick;
        packet->index = index;

        if (!g_dsp_busy)
                current_driver->wave_out_play();
}

inline struct audio_packet *
rdpsnd_queue_current_packet(void)
{
        return &packet_queue[queue_lo];
}

inline BOOL
rdpsnd_queue_empty(void)
{
        return (queue_lo == queue_hi);
}

inline void
rdpsnd_queue_init(void)
{
        queue_lo = queue_hi = 0;
}

inline void
rdpsnd_queue_next(void)
{
        xfree(packet_queue[queue_lo].s.data);
        queue_lo = (queue_lo + 1) % MAX_QUEUE;
}

inline int
rdpsnd_queue_next_tick(void)
{
        if (((queue_lo + 1) % MAX_QUEUE) != queue_hi)
        {
                return packet_queue[(queue_lo + 1) % MAX_QUEUE].tick;
        }
        else
        {
                return (packet_queue[queue_lo].tick + 65535) % 65536;
        }
}
1	/* -- c-basic-offset: 8 --
2	rdesktop: A Remote Desktop Protocol client.
3	Sound Channel Process Functions
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	#include "rdesktop.h"
23	#include "rdpsnd.h"
24	#include "rdpsnd_dsp.h"
25
26	#define RDPSND_CLOSE 1
27	#define RDPSND_WRITE 2
28	#define RDPSND_SET_VOLUME 3
29	#define RDPSND_UNKNOWN4 4
30	#define RDPSND_COMPLETION 5
31	#define RDPSND_SERVERTICK 6
32	#define RDPSND_NEGOTIATE 7
33
34	#define MAX_FORMATS 10
35	#define MAX_QUEUE 10
36
37	BOOL g_dsp_busy = False;
38	int g_dsp_fd;
39
40	static VCHANNEL *rdpsnd_channel;
41	static struct audio_driver *drivers = NULL;
42	struct audio_driver *current_driver = NULL;
43
44	static BOOL device_open;
45	static WAVEFORMATEX formats[MAX_FORMATS];
46	static unsigned int format_count;
47	static unsigned int current_format;
48	unsigned int queue_hi, queue_lo;
49	struct audio_packet packet_queue[MAX_QUEUE];
50
51	void (*wave_out_play) (void);
52
53	static STREAM
54	rdpsnd_init_packet(uint16 type, uint16 size)
55	{
56	STREAM s;
57
58	s = channel_init(rdpsnd_channel, size + 4);
59	out_uint16_le(s, type);
60	out_uint16_le(s, size);
61	return s;
62	}
63
64	static void
65	rdpsnd_send(STREAM s)
66	{
67	#ifdef RDPSND_DEBUG
68	printf("RDPSND send:\n");
69	hexdump(s->channel_hdr + 8, s->end - s->channel_hdr - 8);
70	#endif
71
72	channel_send(s, rdpsnd_channel);
73	}
74
75	void
76	rdpsnd_send_completion(uint16 tick, uint8 packet_index)
77	{
78	STREAM s;
79
80	s = rdpsnd_init_packet(RDPSND_COMPLETION, 4);
81	out_uint16_le(s, tick);
82	out_uint8(s, packet_index);
83	out_uint8(s, 0);
84	s_mark_end(s);
85	rdpsnd_send(s);
86	}
87
88	static void
89	rdpsnd_process_negotiate(STREAM in)
90	{
91	unsigned int in_format_count, i;
92	WAVEFORMATEX *format;
93	STREAM out;
94	BOOL device_available = False;
95	int readcnt;
96	int discardcnt;
97
98	in_uint8s(in, 14); /* flags, volume, pitch, UDP port */
99	in_uint16_le(in, in_format_count);
100	in_uint8s(in, 4); /* pad, status, pad */
101
102	if (current_driver->wave_out_open())
103	{
104	current_driver->wave_out_close();
105	device_available = True;
106	}
107
108	format_count = 0;
109	if (s_check_rem(in, 18 * in_format_count))
110	{
111	for (i = 0; i < in_format_count; i++)
112	{
113	format = &formats[format_count];
114	in_uint16_le(in, format->wFormatTag);
115	in_uint16_le(in, format->nChannels);
116	in_uint32_le(in, format->nSamplesPerSec);
117	in_uint32_le(in, format->nAvgBytesPerSec);
118	in_uint16_le(in, format->nBlockAlign);
119	in_uint16_le(in, format->wBitsPerSample);
120	in_uint16_le(in, format->cbSize);
121
122	/* read in the buffer of unknown use */
123	readcnt = format->cbSize;
124	discardcnt = 0;
125	if (format->cbSize > MAX_CBSIZE)
126	{
127	fprintf(stderr, "cbSize too large for buffer: %d\n",
128	format->cbSize);
129	readcnt = MAX_CBSIZE;
130	discardcnt = format->cbSize - MAX_CBSIZE;
131	}
132	in_uint8a(in, format->cb, readcnt);
133	in_uint8s(in, discardcnt);
134
135	if (device_available && current_driver->wave_out_format_supported(format))
136	{
137	format_count++;
138	if (format_count == MAX_FORMATS)
139	break;
140	}
141	}
142	}
143
144	out = rdpsnd_init_packet(RDPSND_NEGOTIATE \| 0x200, 20 + 18 * format_count);
145	out_uint32_le(out, 3); /* flags */
146	out_uint32(out, 0xffffffff); /* volume */
147	out_uint32(out, 0); /* pitch */
148	out_uint16(out, 0); /* UDP port */
149
150	out_uint16_le(out, format_count);
151	out_uint8(out, 0x95); /* pad? */
152	out_uint16_le(out, 2); /* status */
153	out_uint8(out, 0x77); /* pad? */
154
155	for (i = 0; i < format_count; i++)
156	{
157	format = &formats[i];
158	out_uint16_le(out, format->wFormatTag);
159	out_uint16_le(out, format->nChannels);
160	out_uint32_le(out, format->nSamplesPerSec);
161	out_uint32_le(out, format->nAvgBytesPerSec);
162	out_uint16_le(out, format->nBlockAlign);
163	out_uint16_le(out, format->wBitsPerSample);
164	out_uint16(out, 0); /* cbSize */
165	}
166
167	s_mark_end(out);
168	rdpsnd_send(out);
169	}
170
171	static void
172	rdpsnd_process_servertick(STREAM in)
173	{
174	uint16 tick1, tick2;
175	STREAM out;
176
177	/* in_uint8s(in, 4); unknown */
178	in_uint16_le(in, tick1);
179	in_uint16_le(in, tick2);
180
181	out = rdpsnd_init_packet(RDPSND_SERVERTICK \| 0x2300, 4);
182	out_uint16_le(out, tick1);
183	out_uint16_le(out, tick2);
184	s_mark_end(out);
185	rdpsnd_send(out);
186	}
187
188	static void
189	rdpsnd_process(STREAM s)
190	{
191	uint8 type;
192	uint16 datalen;
193	uint32 volume;
194	static uint16 tick, format;
195	static uint8 packet_index;
196	static BOOL awaiting_data_packet;
197	static unsigned char missing_bytes[4] = { 0, 0, 0, 0 };
198
199	#ifdef RDPSND_DEBUG
200	printf("RDPSND recv:\n");
201	hexdump(s->p, s->end - s->p);
202	#endif
203
204	if (awaiting_data_packet)
205	{
206	if (format >= MAX_FORMATS)
207	{
208	error("RDPSND: Invalid format index\n");
209	return;
210	}
211
212	if (!device_open \|\| (format != current_format))
213	{
214	if (!device_open && !current_driver->wave_out_open())
215	{
216	rdpsnd_send_completion(tick, packet_index);
217	return;
218	}
219	if (!current_driver->wave_out_set_format(&formats[format]))
220	{
221	rdpsnd_send_completion(tick, packet_index);
222	current_driver->wave_out_close();
223	device_open = False;
224	return;
225	}
226	device_open = True;
227	current_format = format;
228	}
229
230	/* Insert the 4 missing bytes retrieved from last RDPSND_WRITE */
231	memcpy(s->data, missing_bytes, 4);
232
233	current_driver->
234	wave_out_write(rdpsnd_dsp_process
235	(s, current_driver, &formats[current_format]), tick,
236	packet_index);
237	awaiting_data_packet = False;
238	return;
239	}
240
241	in_uint8(s, type);
242	in_uint8s(s, 1); /* unknown? */
243	in_uint16_le(s, datalen);
244
245	switch (type)
246	{
247	case RDPSND_WRITE:
248	in_uint16_le(s, tick);
249	in_uint16_le(s, format);
250	in_uint8(s, packet_index);
251	/* Here are our lost bytes, but why? */
252	memcpy(missing_bytes, s->end - 4, 4);
253	awaiting_data_packet = True;
254	break;
255	case RDPSND_CLOSE:
256	current_driver->wave_out_close();
257	device_open = False;
258	break;
259	case RDPSND_NEGOTIATE:
260	rdpsnd_process_negotiate(s);
261	break;
262	case RDPSND_SERVERTICK:
263	rdpsnd_process_servertick(s);
264	break;
265	case RDPSND_SET_VOLUME:
266	in_uint32(s, volume);
267	if (device_open)
268	{
269	current_driver->wave_out_volume((volume & 0xffff),
270	(volume & 0xffff0000) >> 16);
271	}
272	break;
273	default:
274	unimpl("RDPSND packet type %d\n", type);
275	break;
276	}
277	}
278
279	inline BOOL
280	rdpsnd_auto_open(void)
281	{
282	static BOOL failed = False;
283
284	if (!failed)
285	{
286	struct audio_driver *auto_driver = current_driver;
287
288	current_driver = drivers;
289	while (current_driver != NULL)
290	{
291	DEBUG(("trying %s...\n", current_driver->name));
292	if (current_driver->wave_out_open())
293	{
294	DEBUG(("selected %s\n", current_driver->name));
295	return True;
296	}
297	g_dsp_fd = 0;
298	current_driver = current_driver->next;
299	}
300
301	warning("no working audio-driver found\n");
302	failed = True;
303	current_driver = auto_driver;
304	}
305
306	return False;
307	}
308
309	inline void
310	rdpsnd_register_drivers(char *options)
311	{
312	struct audio_driver **reg;
313
314	/* The order of registrations define the probe-order
315	when opening the device for the first time */
316	reg = &drivers;
317	#if defined(RDPSND_ALSA)
318	*reg = alsa_register(options);
319	reg = &((*reg)->next);
320	#endif
321	#if defined(RDPSND_SUN)
322	*reg = sun_register(options);
323	reg = &((*reg)->next);
324	#endif
325	#if defined(RDPSND_OSS)
326	*reg = oss_register(options);
327	reg = &((*reg)->next);
328	#endif
329	#if defined(RDPSND_SGI)
330	*reg = sgi_register(options);
331	reg = &((*reg)->next);
332	#endif
333	#if defined(RDPSND_LIBAO)
334	*reg = libao_register(options);
335	reg = &((*reg)->next);
336	#endif
337	}
338
339	BOOL
340	rdpsnd_init(char *optarg)
341	{
342	static struct audio_driver auto_driver;
343	struct audio_driver *pos;
344	char driver = NULL, options = NULL;
345
346	drivers = NULL;
347
348	rdpsnd_channel =
349	channel_register("rdpsnd", CHANNEL_OPTION_INITIALIZED \| CHANNEL_OPTION_ENCRYPT_RDP,
350	rdpsnd_process);
351
352	if (rdpsnd_channel == NULL)
353	{
354	error("channel_register\n");
355	return False;
356	}
357
358	if (optarg != NULL && strlen(optarg) > 0)
359	{
360	driver = options = optarg;
361
362	while (options != '\0' && options != ':')
363	options++;
364
365	if (*options == ':')
366	{
367	*options = '\0';
368	options++;
369	}
370
371	if (*options == '\0')
372	options = NULL;
373	}
374
375	rdpsnd_register_drivers(options);
376
377	if (!driver)
378	{
379	auto_driver.wave_out_open = &rdpsnd_auto_open;
380	current_driver = &auto_driver;
381	return True;
382	}
383
384	pos = drivers;
385	while (pos != NULL)
386	{
387	if (!strcmp(pos->name, driver))
388	{
389	DEBUG(("selected %s\n", pos->name));
390	current_driver = pos;
391	return True;
392	}
393	pos = pos->next;
394	}
395	return False;
396	}
397
398	void
399	rdpsnd_show_help(void)
400	{
401	struct audio_driver *pos;
402
403	rdpsnd_register_drivers(NULL);
404
405	pos = drivers;
406	while (pos != NULL)
407	{
408	fprintf(stderr, " %s:\t%s\n", pos->name, pos->description);
409	pos = pos->next;
410	}
411	}
412
413	void
414	rdpsnd_play(void)
415	{
416	current_driver->wave_out_play();
417	}
418
419	inline void
420	rdpsnd_queue_write(STREAM s, uint16 tick, uint8 index)
421	{
422	struct audio_packet *packet = &packet_queue[queue_hi];
423	unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE;
424
425	if (next_hi == queue_lo)
426	{
427	error("No space to queue audio packet\n");
428	return;
429	}
430
431	queue_hi = next_hi;
432
433	packet->s = *s;
434	packet->tick = tick;
435	packet->index = index;
436
437	if (!g_dsp_busy)
438	current_driver->wave_out_play();
439	}
440
441	inline struct audio_packet *
442	rdpsnd_queue_current_packet(void)
443	{
444	return &packet_queue[queue_lo];
445	}
446
447	inline BOOL
448	rdpsnd_queue_empty(void)
449	{
450	return (queue_lo == queue_hi);
451	}
452
453	inline void
454	rdpsnd_queue_init(void)
455	{
456	queue_lo = queue_hi = 0;
457	}
458
459	inline void
460	rdpsnd_queue_next(void)
461	{
462	xfree(packet_queue[queue_lo].s.data);
463	queue_lo = (queue_lo + 1) % MAX_QUEUE;
464	}
465
466	inline int
467	rdpsnd_queue_next_tick(void)
468	{
469	if (((queue_lo + 1) % MAX_QUEUE) != queue_hi)
470	{
471	return packet_queue[(queue_lo + 1) % MAX_QUEUE].tick;
472	}
473	else
474	{
475	return (packet_queue[queue_lo].tick + 65535) % 65536;
476	}
477	}