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"

#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;
static 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;
static unsigned int queue_hi, queue_lo;
static 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(s, 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;
        packet->s.p += 4;

        /* we steal the data buffer from s, give it a new one */
        s->data = malloc(s->size);

        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)
{
        free(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	matthewc	432
25	matthewc	474	#define RDPSND_CLOSE 1
26			#define RDPSND_WRITE 2
27			#define RDPSND_SET_VOLUME 3
28			#define RDPSND_UNKNOWN4 4
29			#define RDPSND_COMPLETION 5
30	stargo	1044	#define RDPSND_SERVERTICK 6
31	matthewc	474	#define RDPSND_NEGOTIATE 7
32
33			#define MAX_FORMATS 10
34	stargo	1254	#define MAX_QUEUE 10
35	matthewc	474
36	stargo	1254	BOOL g_dsp_busy = False;
37			int g_dsp_fd;
38
39	matthewc	432	static VCHANNEL *rdpsnd_channel;
40	stargo	1255	static struct audio_driver *drivers = NULL;
41			static struct audio_driver *current_driver = NULL;
42	matthewc	432
43	matthewc	474	static BOOL device_open;
44			static WAVEFORMATEX formats[MAX_FORMATS];
45			static unsigned int format_count;
46			static unsigned int current_format;
47	stargo	1254	static unsigned int queue_hi, queue_lo;
48			static struct audio_packet packet_queue[MAX_QUEUE];
49	matthewc	474
50	stargo	1255	void (*wave_out_play) (void);
51
52	astrand	665	static STREAM
53	matthewc	474	rdpsnd_init_packet(uint16 type, uint16 size)
54			{
55			STREAM s;
56
57	astrand	499	s = channel_init(rdpsnd_channel, size + 4);
58	matthewc	474	out_uint16_le(s, type);
59			out_uint16_le(s, size);
60			return s;
61			}
62
63	astrand	665	static void
64	matthewc	474	rdpsnd_send(STREAM s)
65			{
66			#ifdef RDPSND_DEBUG
67			printf("RDPSND send:\n");
68	astrand	499	hexdump(s->channel_hdr + 8, s->end - s->channel_hdr - 8);
69	matthewc	474	#endif
70
71			channel_send(s, rdpsnd_channel);
72			}
73
74	astrand	499	void
75			rdpsnd_send_completion(uint16 tick, uint8 packet_index)
76	matthewc	474	{
77			STREAM s;
78
79			s = rdpsnd_init_packet(RDPSND_COMPLETION, 4);
80	stargo	1254	out_uint16_le(s, tick);
81	matthewc	474	out_uint8(s, packet_index);
82			out_uint8(s, 0);
83			s_mark_end(s);
84			rdpsnd_send(s);
85			}
86
87	astrand	665	static void
88	matthewc	474	rdpsnd_process_negotiate(STREAM in)
89			{
90			unsigned int in_format_count, i;
91			WAVEFORMATEX *format;
92			STREAM out;
93	stargo	491	BOOL device_available = False;
94	stargo	493	int readcnt;
95			int discardcnt;
96	matthewc	474
97			in_uint8s(in, 14); /* flags, volume, pitch, UDP port */
98			in_uint16_le(in, in_format_count);
99			in_uint8s(in, 4); /* pad, status, pad */
100
101	stargo	1255	if (current_driver->wave_out_open())
102	stargo	491	{
103	stargo	1255	current_driver->wave_out_close();
104	stargo	491	device_available = True;
105			}
106
107	matthewc	474	format_count = 0;
108	astrand	499	if (s_check_rem(in, 18 * in_format_count))
109	matthewc	474	{
110			for (i = 0; i < in_format_count; i++)
111			{
112			format = &formats[format_count];
113			in_uint16_le(in, format->wFormatTag);
114			in_uint16_le(in, format->nChannels);
115			in_uint32_le(in, format->nSamplesPerSec);
116			in_uint32_le(in, format->nAvgBytesPerSec);
117			in_uint16_le(in, format->nBlockAlign);
118			in_uint16_le(in, format->wBitsPerSample);
119			in_uint16_le(in, format->cbSize);
120
121	stargo	492	/* read in the buffer of unknown use */
122	stargo	493	readcnt = format->cbSize;
123			discardcnt = 0;
124	stargo	492	if (format->cbSize > MAX_CBSIZE)
125			{
126	astrand	499	fprintf(stderr, "cbSize too large for buffer: %d\n",
127			format->cbSize);
128	stargo	492	readcnt = MAX_CBSIZE;
129			discardcnt = format->cbSize - MAX_CBSIZE;
130			}
131			in_uint8a(in, format->cb, readcnt);
132			in_uint8s(in, discardcnt);
133
134	stargo	1255	if (device_available && current_driver->wave_out_format_supported(format))
135	matthewc	474	{
136			format_count++;
137			if (format_count == MAX_FORMATS)
138			break;
139			}
140			}
141			}
142
143	astrand	499	out = rdpsnd_init_packet(RDPSND_NEGOTIATE \| 0x200, 20 + 18 * format_count);
144			out_uint32_le(out, 3); /* flags */
145	matthewc	474	out_uint32(out, 0xffffffff); /* volume */
146	astrand	499	out_uint32(out, 0); /* pitch */
147			out_uint16(out, 0); /* UDP port */
148	matthewc	474
149			out_uint16_le(out, format_count);
150	astrand	499	out_uint8(out, 0x95); /* pad? */
151			out_uint16_le(out, 2); /* status */
152			out_uint8(out, 0x77); /* pad? */
153	matthewc	474
154			for (i = 0; i < format_count; i++)
155			{
156			format = &formats[i];
157			out_uint16_le(out, format->wFormatTag);
158			out_uint16_le(out, format->nChannels);
159			out_uint32_le(out, format->nSamplesPerSec);
160			out_uint32_le(out, format->nAvgBytesPerSec);
161			out_uint16_le(out, format->nBlockAlign);
162			out_uint16_le(out, format->wBitsPerSample);
163	astrand	499	out_uint16(out, 0); /* cbSize */
164	matthewc	474	}
165
166			s_mark_end(out);
167			rdpsnd_send(out);
168			}
169
170	astrand	665	static void
171	stargo	1044	rdpsnd_process_servertick(STREAM in)
172	matthewc	474	{
173	stargo	1044	uint16 tick1, tick2;
174	matthewc	474	STREAM out;
175
176			/* in_uint8s(in, 4); unknown */
177	stargo	1044	in_uint16_le(in, tick1);
178			in_uint16_le(in, tick2);
179	matthewc	474
180	stargo	1044	out = rdpsnd_init_packet(RDPSND_SERVERTICK \| 0x2300, 4);
181			out_uint16_le(out, tick1);
182			out_uint16_le(out, tick2);
183	matthewc	474	s_mark_end(out);
184			rdpsnd_send(out);
185			}
186
187	astrand	665	static void
188	matthewc	432	rdpsnd_process(STREAM s)
189			{
190	matthewc	474	uint8 type;
191			uint16 datalen;
192	stargo	491	uint32 volume;
193	matthewc	474	static uint16 tick, format;
194			static uint8 packet_index;
195			static BOOL awaiting_data_packet;
196
197			#ifdef RDPSND_DEBUG
198			printf("RDPSND recv:\n");
199	astrand	499	hexdump(s->p, s->end - s->p);
200	matthewc	474	#endif
201
202			if (awaiting_data_packet)
203			{
204			if (format >= MAX_FORMATS)
205			{
206			error("RDPSND: Invalid format index\n");
207			return;
208			}
209
210			if (!device_open \|\| (format != current_format))
211			{
212	stargo	1255	if (!device_open && !current_driver->wave_out_open())
213	matthewc	474	{
214			rdpsnd_send_completion(tick, packet_index);
215			return;
216			}
217	stargo	1255	if (!current_driver->wave_out_set_format(&formats[format]))
218	matthewc	474	{
219			rdpsnd_send_completion(tick, packet_index);
220	stargo	1255	current_driver->wave_out_close();
221	matthewc	474	device_open = False;
222			return;
223			}
224			device_open = True;
225			current_format = format;
226			}
227
228	stargo	1255	current_driver->wave_out_write(s, tick, packet_index);
229	matthewc	474	awaiting_data_packet = False;
230			return;
231			}
232
233			in_uint8(s, type);
234	astrand	499	in_uint8s(s, 1); /* unknown? */
235	matthewc	474	in_uint16_le(s, datalen);
236
237			switch (type)
238			{
239	astrand	499	case RDPSND_WRITE:
240			in_uint16_le(s, tick);
241			in_uint16_le(s, format);
242			in_uint8(s, packet_index);
243			awaiting_data_packet = True;
244			break;
245			case RDPSND_CLOSE:
246	stargo	1255	current_driver->wave_out_close();
247	astrand	499	device_open = False;
248			break;
249			case RDPSND_NEGOTIATE:
250			rdpsnd_process_negotiate(s);
251			break;
252	stargo	1044	case RDPSND_SERVERTICK:
253			rdpsnd_process_servertick(s);
254	astrand	499	break;
255			case RDPSND_SET_VOLUME:
256			in_uint32(s, volume);
257			if (device_open)
258			{
259	stargo	1255	current_driver->wave_out_volume((volume & 0xffff),
260			(volume & 0xffff0000) >> 16);
261	astrand	499	}
262			break;
263			default:
264			unimpl("RDPSND packet type %d\n", type);
265			break;
266	matthewc	474	}
267	matthewc	432	}
268
269			BOOL
270			rdpsnd_init(void)
271			{
272	astrand	435	rdpsnd_channel =
273			channel_register("rdpsnd", CHANNEL_OPTION_INITIALIZED \| CHANNEL_OPTION_ENCRYPT_RDP,
274			rdpsnd_process);
275	stargo	1254
276	matthewc	432	return (rdpsnd_channel != NULL);
277			}
278	stargo	1254
279	stargo	1255	BOOL
280			rdpsnd_auto_open(void)
281			{
282			current_driver = drivers;
283			while (current_driver != NULL)
284			{
285			DEBUG(("trying %s...\n", current_driver->name));
286			if (current_driver->wave_out_open())
287			{
288			DEBUG(("selected %s\n", current_driver->name));
289			return True;
290			}
291			g_dsp_fd = 0;
292			current_driver = current_driver->next;
293			}
294
295			warning("no working audio-driver found\n");
296
297			return False;
298			}
299
300	stargo	1254	void
301	stargo	1255	rdpsnd_register_drivers(char *options)
302			{
303			struct audio_driver **reg;
304
305			/* The order of registrations define the probe-order
306			when opening the device for the first time */
307			reg = &drivers;
308			#if defined(RDPSND_ALSA)
309			*reg = alsa_register(options);
310			reg = &((*reg)->next);
311			#endif
312			#if defined(RDPSND_OSS)
313			*reg = oss_register(options);
314			reg = &((*reg)->next);
315			#endif
316			#if defined(RDPSND_SUN)
317			*reg = sun_register(options);
318			reg = &((*reg)->next);
319			#endif
320			#if defined(RDPSND_SGI)
321			*reg = sgi_register(options);
322			reg = &((*reg)->next);
323			#endif
324			#if defined(RDPSND_LIBAO)
325			*reg = libao_register(options);
326			reg = &((*reg)->next);
327			#endif
328			}
329
330			BOOL
331			rdpsnd_select_driver(char driver, char options)
332			{
333			static struct audio_driver auto_driver;
334			struct audio_driver *pos;
335
336			drivers = NULL;
337			rdpsnd_register_drivers(options);
338
339			if (!driver)
340			{
341			auto_driver.wave_out_open = &rdpsnd_auto_open;
342			current_driver = &auto_driver;
343			return True;
344			}
345
346			pos = drivers;
347			while (pos != NULL)
348			{
349			if (!strcmp(pos->name, driver))
350			{
351			DEBUG(("selected %s\n", pos->name));
352			current_driver = pos;
353			return True;
354			}
355			pos = pos->next;
356			}
357			return False;
358			}
359
360			void
361			rdpsnd_show_help(void)
362			{
363			struct audio_driver *pos;
364
365			rdpsnd_register_drivers(NULL);
366
367			pos = drivers;
368			while (pos != NULL)
369			{
370			fprintf(stderr, " %s:\t%s\n", pos->name, pos->description);
371			pos = pos->next;
372			}
373			}
374
375			inline void
376			rdpsnd_play(void)
377			{
378			current_driver->wave_out_play();
379			}
380
381			void
382	stargo	1254	rdpsnd_queue_write(STREAM s, uint16 tick, uint8 index)
383			{
384			struct audio_packet *packet = &packet_queue[queue_hi];
385			unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE;
386
387			if (next_hi == queue_lo)
388			{
389			error("No space to queue audio packet\n");
390			return;
391			}
392
393			queue_hi = next_hi;
394
395			packet->s = *s;
396			packet->tick = tick;
397			packet->index = index;
398			packet->s.p += 4;
399
400			/* we steal the data buffer from s, give it a new one */
401			s->data = malloc(s->size);
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			free(packet_queue[queue_lo].s.data);
429			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			}