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;

#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;
                }

                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);
                        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;
        }
}

BOOL
rdpsnd_init(void)
{
        rdpsnd_channel =
                channel_register("rdpsnd", CHANNEL_OPTION_INITIALIZED | CHANNEL_OPTION_ENCRYPT_RDP,
                                 rdpsnd_process);

        return (rdpsnd_channel != NULL);
}

BOOL
rdpsnd_auto_open(void)
{
        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");

        return False;
}

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_OSS)
        *reg = oss_register(options);
        reg = &((*reg)->next);
#endif
#if defined(RDPSND_SUN)
        *reg = sun_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_select_driver(char *driver, char *options)
{
        static struct audio_driver auto_driver;
        struct audio_driver *pos;

        drivers = 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;
        }
}

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

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	astrand	963	/* -- c-basic-offset: 8 --
2	matthewc	474	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	matthewc	432	#include "rdesktop.h"
23	stargo	1254	#include "rdpsnd.h"
24	stargo	1258	#include "rdpsnd_dsp.h"
25	matthewc	432
26	matthewc	474	#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	stargo	1044	#define RDPSND_SERVERTICK 6
32	matthewc	474	#define RDPSND_NEGOTIATE 7
33
34			#define MAX_FORMATS 10
35	stargo	1254	#define MAX_QUEUE 10
36	matthewc	474
37	stargo	1254	BOOL g_dsp_busy = False;
38			int g_dsp_fd;
39
40	matthewc	432	static VCHANNEL *rdpsnd_channel;
41	stargo	1255	static struct audio_driver *drivers = NULL;
42	stargo	1256	struct audio_driver *current_driver = NULL;
43	matthewc	432
44	matthewc	474	static BOOL device_open;
45			static WAVEFORMATEX formats[MAX_FORMATS];
46			static unsigned int format_count;
47			static unsigned int current_format;
48	stargo	1256	unsigned int queue_hi, queue_lo;
49			struct audio_packet packet_queue[MAX_QUEUE];
50	matthewc	474
51	stargo	1255	void (*wave_out_play) (void);
52
53	astrand	665	static STREAM
54	matthewc	474	rdpsnd_init_packet(uint16 type, uint16 size)
55			{
56			STREAM s;
57
58	astrand	499	s = channel_init(rdpsnd_channel, size + 4);
59	matthewc	474	out_uint16_le(s, type);
60			out_uint16_le(s, size);
61			return s;
62			}
63
64	astrand	665	static void
65	matthewc	474	rdpsnd_send(STREAM s)
66			{
67			#ifdef RDPSND_DEBUG
68			printf("RDPSND send:\n");
69	astrand	499	hexdump(s->channel_hdr + 8, s->end - s->channel_hdr - 8);
70	matthewc	474	#endif
71
72			channel_send(s, rdpsnd_channel);
73			}
74
75	astrand	499	void
76			rdpsnd_send_completion(uint16 tick, uint8 packet_index)
77	matthewc	474	{
78			STREAM s;
79
80			s = rdpsnd_init_packet(RDPSND_COMPLETION, 4);
81	stargo	1254	out_uint16_le(s, tick);
82	matthewc	474	out_uint8(s, packet_index);
83			out_uint8(s, 0);
84			s_mark_end(s);
85			rdpsnd_send(s);
86			}
87
88	astrand	665	static void
89	matthewc	474	rdpsnd_process_negotiate(STREAM in)
90			{
91			unsigned int in_format_count, i;
92			WAVEFORMATEX *format;
93			STREAM out;
94	stargo	491	BOOL device_available = False;
95	stargo	493	int readcnt;
96			int discardcnt;
97	matthewc	474
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	stargo	1255	if (current_driver->wave_out_open())
103	stargo	491	{
104	stargo	1255	current_driver->wave_out_close();
105	stargo	491	device_available = True;
106			}
107
108	matthewc	474	format_count = 0;
109	astrand	499	if (s_check_rem(in, 18 * in_format_count))
110	matthewc	474	{
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	stargo	492	/* read in the buffer of unknown use */
123	stargo	493	readcnt = format->cbSize;
124			discardcnt = 0;
125	stargo	492	if (format->cbSize > MAX_CBSIZE)
126			{
127	astrand	499	fprintf(stderr, "cbSize too large for buffer: %d\n",
128			format->cbSize);
129	stargo	492	readcnt = MAX_CBSIZE;
130			discardcnt = format->cbSize - MAX_CBSIZE;
131			}
132			in_uint8a(in, format->cb, readcnt);
133			in_uint8s(in, discardcnt);
134
135	stargo	1255	if (device_available && current_driver->wave_out_format_supported(format))
136	matthewc	474	{
137			format_count++;
138			if (format_count == MAX_FORMATS)
139			break;
140			}
141			}
142			}
143
144	astrand	499	out = rdpsnd_init_packet(RDPSND_NEGOTIATE \| 0x200, 20 + 18 * format_count);
145			out_uint32_le(out, 3); /* flags */
146	matthewc	474	out_uint32(out, 0xffffffff); /* volume */
147	astrand	499	out_uint32(out, 0); /* pitch */
148			out_uint16(out, 0); /* UDP port */
149	matthewc	474
150			out_uint16_le(out, format_count);
151	astrand	499	out_uint8(out, 0x95); /* pad? */
152			out_uint16_le(out, 2); /* status */
153			out_uint8(out, 0x77); /* pad? */
154	matthewc	474
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	astrand	499	out_uint16(out, 0); /* cbSize */
165	matthewc	474	}
166
167			s_mark_end(out);
168			rdpsnd_send(out);
169			}
170
171	astrand	665	static void
172	stargo	1044	rdpsnd_process_servertick(STREAM in)
173	matthewc	474	{
174	stargo	1044	uint16 tick1, tick2;
175	matthewc	474	STREAM out;
176
177			/* in_uint8s(in, 4); unknown */
178	stargo	1044	in_uint16_le(in, tick1);
179			in_uint16_le(in, tick2);
180	matthewc	474
181	stargo	1044	out = rdpsnd_init_packet(RDPSND_SERVERTICK \| 0x2300, 4);
182			out_uint16_le(out, tick1);
183			out_uint16_le(out, tick2);
184	matthewc	474	s_mark_end(out);
185			rdpsnd_send(out);
186			}
187
188	astrand	665	static void
189	matthewc	432	rdpsnd_process(STREAM s)
190			{
191	matthewc	474	uint8 type;
192			uint16 datalen;
193	stargo	491	uint32 volume;
194	matthewc	474	static uint16 tick, format;
195			static uint8 packet_index;
196			static BOOL awaiting_data_packet;
197
198			#ifdef RDPSND_DEBUG
199			printf("RDPSND recv:\n");
200	astrand	499	hexdump(s->p, s->end - s->p);
201	matthewc	474	#endif
202
203			if (awaiting_data_packet)
204			{
205			if (format >= MAX_FORMATS)
206			{
207			error("RDPSND: Invalid format index\n");
208			return;
209			}
210
211			if (!device_open \|\| (format != current_format))
212			{
213	stargo	1255	if (!device_open && !current_driver->wave_out_open())
214	matthewc	474	{
215			rdpsnd_send_completion(tick, packet_index);
216			return;
217			}
218	stargo	1255	if (!current_driver->wave_out_set_format(&formats[format]))
219	matthewc	474	{
220			rdpsnd_send_completion(tick, packet_index);
221	stargo	1255	current_driver->wave_out_close();
222	matthewc	474	device_open = False;
223			return;
224			}
225			device_open = True;
226			current_format = format;
227			}
228
229	stargo	1263	current_driver->
230			wave_out_write(rdpsnd_dsp_process
231			(s, current_driver, &formats[current_format]), tick,
232			packet_index);
233	matthewc	474	awaiting_data_packet = False;
234			return;
235			}
236
237			in_uint8(s, type);
238	astrand	499	in_uint8s(s, 1); /* unknown? */
239	matthewc	474	in_uint16_le(s, datalen);
240
241			switch (type)
242			{
243	astrand	499	case RDPSND_WRITE:
244			in_uint16_le(s, tick);
245			in_uint16_le(s, format);
246			in_uint8(s, packet_index);
247			awaiting_data_packet = True;
248			break;
249			case RDPSND_CLOSE:
250	stargo	1255	current_driver->wave_out_close();
251	astrand	499	device_open = False;
252			break;
253			case RDPSND_NEGOTIATE:
254			rdpsnd_process_negotiate(s);
255			break;
256	stargo	1044	case RDPSND_SERVERTICK:
257			rdpsnd_process_servertick(s);
258	astrand	499	break;
259			case RDPSND_SET_VOLUME:
260			in_uint32(s, volume);
261			if (device_open)
262			{
263	stargo	1255	current_driver->wave_out_volume((volume & 0xffff),
264			(volume & 0xffff0000) >> 16);
265	astrand	499	}
266			break;
267			default:
268			unimpl("RDPSND packet type %d\n", type);
269			break;
270	matthewc	474	}
271	matthewc	432	}
272
273			BOOL
274			rdpsnd_init(void)
275			{
276	astrand	435	rdpsnd_channel =
277			channel_register("rdpsnd", CHANNEL_OPTION_INITIALIZED \| CHANNEL_OPTION_ENCRYPT_RDP,
278			rdpsnd_process);
279	stargo	1254
280	matthewc	432	return (rdpsnd_channel != NULL);
281			}
282	stargo	1254
283	stargo	1255	BOOL
284			rdpsnd_auto_open(void)
285			{
286			current_driver = drivers;
287			while (current_driver != NULL)
288			{
289			DEBUG(("trying %s...\n", current_driver->name));
290			if (current_driver->wave_out_open())
291			{
292			DEBUG(("selected %s\n", current_driver->name));
293			return True;
294			}
295			g_dsp_fd = 0;
296			current_driver = current_driver->next;
297			}
298
299			warning("no working audio-driver found\n");
300
301			return False;
302			}
303
304	stargo	1254	void
305	stargo	1255	rdpsnd_register_drivers(char *options)
306			{
307			struct audio_driver **reg;
308
309			/* The order of registrations define the probe-order
310			when opening the device for the first time */
311			reg = &drivers;
312			#if defined(RDPSND_ALSA)
313			*reg = alsa_register(options);
314			reg = &((*reg)->next);
315			#endif
316			#if defined(RDPSND_OSS)
317			*reg = oss_register(options);
318			reg = &((*reg)->next);
319			#endif
320			#if defined(RDPSND_SUN)
321			*reg = sun_register(options);
322			reg = &((*reg)->next);
323			#endif
324			#if defined(RDPSND_SGI)
325			*reg = sgi_register(options);
326			reg = &((*reg)->next);
327			#endif
328			#if defined(RDPSND_LIBAO)
329			*reg = libao_register(options);
330			reg = &((*reg)->next);
331			#endif
332			}
333
334			BOOL
335			rdpsnd_select_driver(char driver, char options)
336			{
337			static struct audio_driver auto_driver;
338			struct audio_driver *pos;
339
340			drivers = NULL;
341			rdpsnd_register_drivers(options);
342
343			if (!driver)
344			{
345			auto_driver.wave_out_open = &rdpsnd_auto_open;
346			current_driver = &auto_driver;
347			return True;
348			}
349
350			pos = drivers;
351			while (pos != NULL)
352			{
353			if (!strcmp(pos->name, driver))
354			{
355			DEBUG(("selected %s\n", pos->name));
356			current_driver = pos;
357			return True;
358			}
359			pos = pos->next;
360			}
361			return False;
362			}
363
364			void
365			rdpsnd_show_help(void)
366			{
367			struct audio_driver *pos;
368
369			rdpsnd_register_drivers(NULL);
370
371			pos = drivers;
372			while (pos != NULL)
373			{
374			fprintf(stderr, " %s:\t%s\n", pos->name, pos->description);
375			pos = pos->next;
376			}
377			}
378
379			inline void
380			rdpsnd_play(void)
381			{
382			current_driver->wave_out_play();
383			}
384
385			void
386	stargo	1254	rdpsnd_queue_write(STREAM s, uint16 tick, uint8 index)
387			{
388			struct audio_packet *packet = &packet_queue[queue_hi];
389			unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE;
390
391			if (next_hi == queue_lo)
392			{
393			error("No space to queue audio packet\n");
394			return;
395			}
396
397			queue_hi = next_hi;
398
399			packet->s = *s;
400			packet->tick = tick;
401			packet->index = index;
402
403			if (!g_dsp_busy)
404	stargo	1255	current_driver->wave_out_play();
405	stargo	1254	}
406
407			inline struct audio_packet *
408			rdpsnd_queue_current_packet(void)
409			{
410			return &packet_queue[queue_lo];
411			}
412
413			inline BOOL
414			rdpsnd_queue_empty(void)
415			{
416			return (queue_lo == queue_hi);
417			}
418
419			inline void
420			rdpsnd_queue_init(void)
421			{
422			queue_lo = queue_hi = 0;
423			}
424
425			inline void
426			rdpsnd_queue_next(void)
427			{
428	stargo	1258	xfree(packet_queue[queue_lo].s.data);
429	stargo	1254	queue_lo = (queue_lo + 1) % MAX_QUEUE;
430			}
431
432			inline int
433			rdpsnd_queue_next_tick(void)
434			{
435			if (((queue_lo + 1) % MAX_QUEUE) != queue_hi)
436			{
437			return packet_queue[(queue_lo + 1) % MAX_QUEUE].tick;
438			}
439			else
440			{
441			return (packet_queue[queue_lo].tick + 65535) % 65536;
442			}
443			}