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;
        }
}

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;
}

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;
        }
}

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	stargo	1265	static unsigned char missing_bytes[4] = { 0, 0, 0, 0 };
198	matthewc	474
199			#ifdef RDPSND_DEBUG
200			printf("RDPSND recv:\n");
201	astrand	499	hexdump(s->p, s->end - s->p);
202	matthewc	474	#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	stargo	1255	if (!device_open && !current_driver->wave_out_open())
215	matthewc	474	{
216			rdpsnd_send_completion(tick, packet_index);
217			return;
218			}
219	stargo	1255	if (!current_driver->wave_out_set_format(&formats[format]))
220	matthewc	474	{
221			rdpsnd_send_completion(tick, packet_index);
222	stargo	1255	current_driver->wave_out_close();
223	matthewc	474	device_open = False;
224			return;
225			}
226			device_open = True;
227			current_format = format;
228			}
229
230	stargo	1265	/* Insert the 4 missing bytes retrieved from last RDPSND_WRITE */
231			memcpy(s->data, missing_bytes, 4);
232
233	stargo	1263	current_driver->
234			wave_out_write(rdpsnd_dsp_process
235			(s, current_driver, &formats[current_format]), tick,
236			packet_index);
237	matthewc	474	awaiting_data_packet = False;
238			return;
239			}
240
241			in_uint8(s, type);
242	astrand	499	in_uint8s(s, 1); /* unknown? */
243	matthewc	474	in_uint16_le(s, datalen);
244
245			switch (type)
246			{
247	astrand	499	case RDPSND_WRITE:
248			in_uint16_le(s, tick);
249			in_uint16_le(s, format);
250			in_uint8(s, packet_index);
251	stargo	1265	/* Here are our lost bytes, but why? */
252			memcpy(missing_bytes, s->end - 4, 4);
253	astrand	499	awaiting_data_packet = True;
254			break;
255			case RDPSND_CLOSE:
256	stargo	1255	current_driver->wave_out_close();
257	astrand	499	device_open = False;
258			break;
259			case RDPSND_NEGOTIATE:
260			rdpsnd_process_negotiate(s);
261			break;
262	stargo	1044	case RDPSND_SERVERTICK:
263			rdpsnd_process_servertick(s);
264	astrand	499	break;
265			case RDPSND_SET_VOLUME:
266			in_uint32(s, volume);
267			if (device_open)
268			{
269	stargo	1255	current_driver->wave_out_volume((volume & 0xffff),
270			(volume & 0xffff0000) >> 16);
271	astrand	499	}
272			break;
273			default:
274			unimpl("RDPSND packet type %d\n", type);
275			break;
276	matthewc	474	}
277	matthewc	432	}
278
279			BOOL
280	stargo	1255	rdpsnd_auto_open(void)
281			{
282	stargo	1271	static BOOL failed = False;
283
284			if (!failed)
285	stargo	1255	{
286	stargo	1271	struct audio_driver *auto_driver = current_driver;
287
288			current_driver = drivers;
289			while (current_driver != NULL)
290	stargo	1255	{
291	stargo	1271	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	stargo	1255	}
300	stargo	1271
301			warning("no working audio-driver found\n");
302			failed = True;
303			current_driver = auto_driver;
304	stargo	1255	}
305
306			return False;
307			}
308
309	stargo	1254	void
310	stargo	1255	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	stargo	1264	#if defined(RDPSND_SUN)
322			*reg = sun_register(options);
323			reg = &((*reg)->next);
324			#endif
325	stargo	1255	#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	stargo	1272	rdpsnd_init(char *optarg)
341	stargo	1255	{
342			static struct audio_driver auto_driver;
343			struct audio_driver *pos;
344	stargo	1272	char driver = NULL, options = NULL;
345	stargo	1255
346			drivers = NULL;
347	stargo	1272
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	stargo	1255	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			inline void
414			rdpsnd_play(void)
415			{
416			current_driver->wave_out_play();
417			}
418
419			void
420	stargo	1254	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	stargo	1255	current_driver->wave_out_play();
439	stargo	1254	}
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	stargo	1258	xfree(packet_queue[queue_lo].s.data);
463	stargo	1254	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			}