rdesktop/trunk/rdpsnd.c

/* -*- c-basic-offset: 8 -*-
   rdesktop: A Remote Desktop Protocol client.
   Sound Channel Process Functions
   Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
   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 <assert.h>

#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_PING                     6
#define RDPSND_NEGOTIATE        7

#define MAX_FORMATS             10
#define MAX_QUEUE               10

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, queue_pending;
struct audio_packet packet_queue[MAX_QUEUE];

static uint8 packet_opcode;
static struct stream packet;

void (*wave_out_play) (void);

static void rdpsnd_queue_write(STREAM s, uint16 tick, uint8 index);
static void rdpsnd_queue_init(void);
static void rdpsnd_queue_complete_pending(void);
static long rdpsnd_queue_next_completion(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)
{
        channel_send(s, rdpsnd_channel);
}

static 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);

        DEBUG_SOUND(("RDPSND: -> RDPSND_COMPLETION(tick: %u, index: %u)\n",
                     (unsigned) tick, (unsigned) packet_index));
}


static BOOL
rdpsnd_auto_select(void)
{
        static BOOL failed = False;

        if (!failed)
        {
                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));
                                current_driver->wave_out_close();
                                return True;
                        }
                        current_driver = current_driver->next;
                }

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

        return False;
}

static void
rdpsnd_process_negotiate(STREAM in)
{
        uint16 in_format_count, i;
        uint8 pad;
        uint16 version;
        WAVEFORMATEX *format;
        STREAM out;
        BOOL device_available = False;
        int readcnt;
        int discardcnt;

        in_uint8s(in, 14);      /* initial bytes not valid from server */
        in_uint16_le(in, in_format_count);
        in_uint8(in, pad);
        in_uint16_le(in, version);
        in_uint8s(in, 1);       /* padding */

        DEBUG_SOUND(("RDPSND: RDPSND_NEGOTIATE(formats: %d, pad: 0x%02x, version: %x)\n",
                     (int) in_format_count, (unsigned) pad, (unsigned) version));

        if (!current_driver)
                rdpsnd_auto_select();

        if (current_driver)
        {
                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, 0);      /* padding */
        out_uint16_le(out, 2);  /* version */
        out_uint8(out, 0);      /* padding */

        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);

        DEBUG_SOUND(("RDPSND: -> RDPSND_NEGOTIATE(formats: %d)\n", (int) format_count));

        rdpsnd_send(out);
}

static void
rdpsnd_process_ping(STREAM in)
{
        uint16 tick;
        STREAM out;

        in_uint16_le(in, tick);

        DEBUG_SOUND(("RDPSND: RDPSND_PING(tick: 0x%04x)\n", (unsigned) tick));

        out = rdpsnd_init_packet(RDPSND_PING | 0x2300, 4);
        out_uint16_le(out, tick);
        out_uint16_le(out, 0);
        s_mark_end(out);
        rdpsnd_send(out);

        DEBUG_SOUND(("RDPSND: -> (tick: 0x%04x)\n", (unsigned) tick));
}

static void
rdpsnd_process_packet(uint8 opcode, STREAM s)
{
        uint16 vol_left, vol_right;
        static uint16 tick, format;
        static uint8 packet_index;

        switch (opcode)
        {
                case RDPSND_WRITE:
                        in_uint16_le(s, tick);
                        in_uint16_le(s, format);
                        in_uint8(s, packet_index);
                        in_uint8s(s, 3);
                        DEBUG_SOUND(("RDPSND: RDPSND_WRITE(tick: %u, format: %u, index: %u, data: %u bytes)\n", (unsigned) tick, (unsigned) format, (unsigned) packet_index, (unsigned) s->size - 8));

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

                        if (!device_open || (format != current_format))
                        {
                                /*
                                 * If we haven't selected a device by now, then either
                                 * we've failed to find a working device, or the server
                                 * is sending bogus RDPSND_WRITE.
                                 */
                                if (!current_driver)
                                {
                                        rdpsnd_send_completion(tick, packet_index);
                                        break;
                                }
                                if (!device_open && !current_driver->wave_out_open())
                                {
                                        rdpsnd_send_completion(tick, packet_index);
                                        break;
                                }
                                if (!current_driver->wave_out_set_format(&formats[format]))
                                {
                                        rdpsnd_send_completion(tick, packet_index);
                                        current_driver->wave_out_close();
                                        device_open = False;
                                        break;
                                }
                                device_open = True;
                                current_format = format;
                        }

                        rdpsnd_queue_write(rdpsnd_dsp_process
                                           (s->p, s->end - s->p, current_driver,
                                            &formats[current_format]), tick, packet_index);
                        return;
                        break;
                case RDPSND_CLOSE:
                        DEBUG_SOUND(("RDPSND: RDPSND_CLOSE()\n"));
                        if (device_open)
                                current_driver->wave_out_close();
                        device_open = False;
                        break;
                case RDPSND_NEGOTIATE:
                        rdpsnd_process_negotiate(s);
                        break;
                case RDPSND_PING:
                        rdpsnd_process_ping(s);
                        break;
                case RDPSND_SET_VOLUME:
                        in_uint16_le(s, vol_left);
                        in_uint16_le(s, vol_right);
                        DEBUG_SOUND(("RDPSND: RDPSND_VOLUME(left: 0x%04x (%u %%), right: 0x%04x (%u %%))\n", (unsigned) vol_left, (unsigned) vol_left / 655, (unsigned) vol_right, (unsigned) vol_right / 655));
                        if (device_open)
                                current_driver->wave_out_volume(vol_left, vol_right);
                        break;
                default:
                        unimpl("RDPSND packet type %x\n", opcode);
                        break;
        }
}

static void
rdpsnd_process(STREAM s)
{
        uint16 len;

        while (!s_check_end(s))
        {
                /* New packet */
                if (packet.size == 0)
                {
                        if ((s->end - s->p) < 4)
                        {
                                error("RDPSND: Split at packet header. Things will go south from here...\n");
                                return;
                        }
                        in_uint8(s, packet_opcode);
                        in_uint8s(s, 1);        /* Padding */
                        in_uint16_le(s, len);

                        DEBUG_SOUND(("RDPSND: == Opcode %x Length: %d ==\n",
                                     (int) packet_opcode, (int) len));

                        packet.p = packet.data;
                        packet.end = packet.data + len;
                        packet.size = len;
                }
                else
                {
                        len = MIN(s->end - s->p, packet.end - packet.p);

                        /* Microsoft's server is so broken it's not even funny... */
                        if (packet_opcode == RDPSND_WRITE)
                        {
                                if ((packet.p - packet.data) < 12)
                                        len = MIN(len, 12 - (packet.p - packet.data));
                                else if ((packet.p - packet.data) == 12)
                                {
                                        DEBUG_SOUND(("RDPSND: Eating 4 bytes of %d bytes...\n",
                                                     len));
                                        in_uint8s(s, 4);
                                        len -= 4;
                                }
                        }

                        in_uint8a(s, packet.p, len);
                        packet.p += len;
                }

                /* Packet fully assembled */
                if (packet.p == packet.end)
                {
                        packet.p = packet.data;
                        rdpsnd_process_packet(packet_opcode, &packet);
                        packet.size = 0;
                }
        }
}

static 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);
        assert(*reg);
        reg = &((*reg)->next);
#endif
#if defined(RDPSND_SUN)
        *reg = sun_register(options);
        assert(*reg);
        reg = &((*reg)->next);
#endif
#if defined(RDPSND_OSS)
        *reg = oss_register(options);
        assert(*reg);
        reg = &((*reg)->next);
#endif
#if defined(RDPSND_SGI)
        *reg = sgi_register(options);
        assert(*reg);
        reg = &((*reg)->next);
#endif
#if defined(RDPSND_LIBAO)
        *reg = libao_register(options);
        assert(*reg);
        reg = &((*reg)->next);
#endif
        *reg = NULL;
}

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

        drivers = NULL;

        packet.data = xmalloc(65536);
        packet.p = packet.end = packet.data;
        packet.size = 0;

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

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

        rdpsnd_queue_init();

        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)
                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_add_fds(int *n, fd_set * rfds, fd_set * wfds, struct timeval *tv)
{
        long next_pending;

        if (device_open)
                current_driver->add_fds(n, rfds, wfds, tv);

        next_pending = rdpsnd_queue_next_completion();
        if (next_pending >= 0)
        {
                long cur_timeout;

                cur_timeout = tv->tv_sec * 1000000 + tv->tv_usec;
                if (cur_timeout > next_pending)
                {
                        tv->tv_sec = next_pending / 1000000;
                        tv->tv_usec = next_pending % 1000000;
                }
        }
}

void
rdpsnd_check_fds(fd_set * rfds, fd_set * wfds)
{
        rdpsnd_queue_complete_pending();

        if (device_open)
                current_driver->check_fds(rfds, wfds);
}

static 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_pending)
        {
                error("No space to queue audio packet\n");
                return;
        }

        queue_hi = next_hi;

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

        gettimeofday(&packet->arrive_tv, NULL);
}

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

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

static void
rdpsnd_queue_init(void)
{
        queue_pending = queue_lo = queue_hi = 0;
}

void
rdpsnd_queue_next(unsigned long completed_in_us)
{
        struct audio_packet *packet;

        assert(!rdpsnd_queue_empty());

        packet = &packet_queue[queue_lo];

        gettimeofday(&packet->completion_tv, NULL);

        packet->completion_tv.tv_usec += completed_in_us;
        packet->completion_tv.tv_sec += packet->completion_tv.tv_usec / 1000000;
        packet->completion_tv.tv_usec %= 1000000;

        queue_lo = (queue_lo + 1) % MAX_QUEUE;

        rdpsnd_queue_complete_pending();
}

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;
        }
}

static void
rdpsnd_queue_complete_pending(void)
{
        struct timeval now;
        long elapsed;
        struct audio_packet *packet;

        gettimeofday(&now, NULL);

        while (queue_pending != queue_lo)
        {
                packet = &packet_queue[queue_pending];

                if (now.tv_sec < packet->completion_tv.tv_sec)
                        break;

                if ((now.tv_sec == packet->completion_tv.tv_sec) &&
                    (now.tv_usec < packet->completion_tv.tv_usec))
                        break;

                elapsed = (packet->completion_tv.tv_sec - packet->arrive_tv.tv_sec) * 1000000 +
                        (packet->completion_tv.tv_usec - packet->arrive_tv.tv_usec);
                elapsed /= 1000;

                xfree(packet->s.data);
                rdpsnd_send_completion((packet->tick + elapsed) % 65536, packet->index);
                queue_pending = (queue_pending + 1) % MAX_QUEUE;
        }
}

static long
rdpsnd_queue_next_completion(void)
{
        struct audio_packet *packet;
        long remaining;
        struct timeval now;

        if (queue_pending == queue_lo)
                return -1;

        gettimeofday(&now, NULL);

        packet = &packet_queue[queue_pending];

        remaining = (packet->completion_tv.tv_sec - now.tv_sec) * 1000000 +
                (packet->completion_tv.tv_usec - now.tv_usec);

        if (remaining < 0)
                return 0;

        return remaining;
}
1	astrand	963	/* -- c-basic-offset: 8 --
2	matthewc	474	rdesktop: A Remote Desktop Protocol client.
3			Sound Channel Process Functions
4	ossman_	1343	Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
5	matthewc	474	Copyright (C) Matthew Chapman 2003
6			Copyright (C) GuoJunBo guojunbo@ict.ac.cn 2003
7
8			This program is free software; you can redistribute it and/or modify
9			it under the terms of the GNU General Public License as published by
10			the Free Software Foundation; either version 2 of the License, or
11			(at your option) any later version.
12
13			This program is distributed in the hope that it will be useful,
14			but WITHOUT ANY WARRANTY; without even the implied warranty of
15			MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16			GNU General Public License for more details.
17
18			You should have received a copy of the GNU General Public License
19			along with this program; if not, write to the Free Software
20			Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21			*/
22
23	ossman_	1298	#include <assert.h>
24
25	matthewc	432	#include "rdesktop.h"
26	stargo	1254	#include "rdpsnd.h"
27	stargo	1258	#include "rdpsnd_dsp.h"
28	matthewc	432
29	matthewc	474	#define RDPSND_CLOSE 1
30			#define RDPSND_WRITE 2
31			#define RDPSND_SET_VOLUME 3
32			#define RDPSND_UNKNOWN4 4
33			#define RDPSND_COMPLETION 5
34	ossman_	1339	#define RDPSND_PING 6
35	matthewc	474	#define RDPSND_NEGOTIATE 7
36
37			#define MAX_FORMATS 10
38	stargo	1254	#define MAX_QUEUE 10
39	matthewc	474
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	ossman_	1302	unsigned int queue_hi, queue_lo, queue_pending;
49	stargo	1256	struct audio_packet packet_queue[MAX_QUEUE];
50	matthewc	474
51	ossman_	1342	static uint8 packet_opcode;
52			static struct stream packet;
53
54	stargo	1255	void (*wave_out_play) (void);
55
56	ossman_	1302	static void rdpsnd_queue_write(STREAM s, uint16 tick, uint8 index);
57			static void rdpsnd_queue_init(void);
58			static void rdpsnd_queue_complete_pending(void);
59			static long rdpsnd_queue_next_completion(void);
60
61	astrand	665	static STREAM
62	matthewc	474	rdpsnd_init_packet(uint16 type, uint16 size)
63			{
64			STREAM s;
65
66	astrand	499	s = channel_init(rdpsnd_channel, size + 4);
67	matthewc	474	out_uint16_le(s, type);
68			out_uint16_le(s, size);
69			return s;
70			}
71
72	astrand	665	static void
73	matthewc	474	rdpsnd_send(STREAM s)
74			{
75			channel_send(s, rdpsnd_channel);
76			}
77
78	ossman_	1302	static void
79	astrand	499	rdpsnd_send_completion(uint16 tick, uint8 packet_index)
80	matthewc	474	{
81			STREAM s;
82
83			s = rdpsnd_init_packet(RDPSND_COMPLETION, 4);
84	stargo	1254	out_uint16_le(s, tick);
85	matthewc	474	out_uint8(s, packet_index);
86			out_uint8(s, 0);
87			s_mark_end(s);
88			rdpsnd_send(s);
89	ossman_	1343
90			DEBUG_SOUND(("RDPSND: -> RDPSND_COMPLETION(tick: %u, index: %u)\n",
91			(unsigned) tick, (unsigned) packet_index));
92	matthewc	474	}
93
94	ossman_	1346
95			static BOOL
96			rdpsnd_auto_select(void)
97			{
98			static BOOL failed = False;
99
100			if (!failed)
101			{
102			current_driver = drivers;
103			while (current_driver != NULL)
104			{
105			DEBUG(("trying %s...\n", current_driver->name));
106			if (current_driver->wave_out_open())
107			{
108			DEBUG(("selected %s\n", current_driver->name));
109	stargo	1350	current_driver->wave_out_close();
110	ossman_	1346	return True;
111			}
112			current_driver = current_driver->next;
113			}
114
115			warning("no working audio-driver found\n");
116			failed = True;
117			current_driver = NULL;
118			}
119
120			return False;
121			}
122
123	astrand	665	static void
124	matthewc	474	rdpsnd_process_negotiate(STREAM in)
125			{
126	ossman_	1340	uint16 in_format_count, i;
127			uint8 pad;
128			uint16 version;
129	matthewc	474	WAVEFORMATEX *format;
130			STREAM out;
131	stargo	491	BOOL device_available = False;
132	stargo	493	int readcnt;
133			int discardcnt;
134	matthewc	474
135	ossman_	1340	in_uint8s(in, 14); /* initial bytes not valid from server */
136	matthewc	474	in_uint16_le(in, in_format_count);
137	ossman_	1340	in_uint8(in, pad);
138			in_uint16_le(in, version);
139			in_uint8s(in, 1); /* padding */
140	matthewc	474
141	ossman_	1344	DEBUG_SOUND(("RDPSND: RDPSND_NEGOTIATE(formats: %d, pad: 0x%02x, version: %x)\n",
142			(int) in_format_count, (unsigned) pad, (unsigned) version));
143	ossman_	1343
144	ossman_	1346	if (!current_driver)
145			rdpsnd_auto_select();
146
147	stargo	1350	if (current_driver)
148	stargo	491	{
149			device_available = True;
150			}
151
152	matthewc	474	format_count = 0;
153	astrand	499	if (s_check_rem(in, 18 * in_format_count))
154	matthewc	474	{
155			for (i = 0; i < in_format_count; i++)
156			{
157			format = &formats[format_count];
158			in_uint16_le(in, format->wFormatTag);
159			in_uint16_le(in, format->nChannels);
160			in_uint32_le(in, format->nSamplesPerSec);
161			in_uint32_le(in, format->nAvgBytesPerSec);
162			in_uint16_le(in, format->nBlockAlign);
163			in_uint16_le(in, format->wBitsPerSample);
164			in_uint16_le(in, format->cbSize);
165
166	stargo	492	/* read in the buffer of unknown use */
167	stargo	493	readcnt = format->cbSize;
168			discardcnt = 0;
169	stargo	492	if (format->cbSize > MAX_CBSIZE)
170			{
171	astrand	499	fprintf(stderr, "cbSize too large for buffer: %d\n",
172			format->cbSize);
173	stargo	492	readcnt = MAX_CBSIZE;
174			discardcnt = format->cbSize - MAX_CBSIZE;
175			}
176			in_uint8a(in, format->cb, readcnt);
177			in_uint8s(in, discardcnt);
178
179	stargo	1255	if (device_available && current_driver->wave_out_format_supported(format))
180	matthewc	474	{
181			format_count++;
182			if (format_count == MAX_FORMATS)
183			break;
184			}
185			}
186			}
187
188	astrand	499	out = rdpsnd_init_packet(RDPSND_NEGOTIATE \| 0x200, 20 + 18 * format_count);
189			out_uint32_le(out, 3); /* flags */
190	matthewc	474	out_uint32(out, 0xffffffff); /* volume */
191	astrand	499	out_uint32(out, 0); /* pitch */
192			out_uint16(out, 0); /* UDP port */
193	matthewc	474
194			out_uint16_le(out, format_count);
195	ossman_	1340	out_uint8(out, 0); /* padding */
196			out_uint16_le(out, 2); /* version */
197			out_uint8(out, 0); /* padding */
198	matthewc	474
199			for (i = 0; i < format_count; i++)
200			{
201			format = &formats[i];
202			out_uint16_le(out, format->wFormatTag);
203			out_uint16_le(out, format->nChannels);
204			out_uint32_le(out, format->nSamplesPerSec);
205			out_uint32_le(out, format->nAvgBytesPerSec);
206			out_uint16_le(out, format->nBlockAlign);
207			out_uint16_le(out, format->wBitsPerSample);
208	astrand	499	out_uint16(out, 0); /* cbSize */
209	matthewc	474	}
210
211			s_mark_end(out);
212	ossman_	1343
213			DEBUG_SOUND(("RDPSND: -> RDPSND_NEGOTIATE(formats: %d)\n", (int) format_count));
214
215	matthewc	474	rdpsnd_send(out);
216			}
217
218	astrand	665	static void
219	ossman_	1339	rdpsnd_process_ping(STREAM in)
220	matthewc	474	{
221	ossman_	1339	uint16 tick;
222	matthewc	474	STREAM out;
223
224	ossman_	1339	in_uint16_le(in, tick);
225	matthewc	474
226	ossman_	1343	DEBUG_SOUND(("RDPSND: RDPSND_PING(tick: 0x%04x)\n", (unsigned) tick));
227
228	ossman_	1339	out = rdpsnd_init_packet(RDPSND_PING \| 0x2300, 4);
229			out_uint16_le(out, tick);
230			out_uint16_le(out, 0);
231	matthewc	474	s_mark_end(out);
232			rdpsnd_send(out);
233	ossman_	1343
234			DEBUG_SOUND(("RDPSND: -> (tick: 0x%04x)\n", (unsigned) tick));
235	matthewc	474	}
236
237	astrand	665	static void
238	ossman_	1342	rdpsnd_process_packet(uint8 opcode, STREAM s)
239	matthewc	432	{
240	ossman_	1341	uint16 vol_left, vol_right;
241	matthewc	474	static uint16 tick, format;
242			static uint8 packet_index;
243
244	ossman_	1342	switch (opcode)
245	matthewc	474	{
246	ossman_	1342	case RDPSND_WRITE:
247			in_uint16_le(s, tick);
248			in_uint16_le(s, format);
249			in_uint8(s, packet_index);
250			in_uint8s(s, 3);
251	ossman_	1343	DEBUG_SOUND(("RDPSND: RDPSND_WRITE(tick: %u, format: %u, index: %u, data: %u bytes)\n", (unsigned) tick, (unsigned) format, (unsigned) packet_index, (unsigned) s->size - 8));
252	matthewc	474
253	ossman_	1342	if (format >= MAX_FORMATS)
254	matthewc	474	{
255	ossman_	1342	error("RDPSND: Invalid format index\n");
256			break;
257	matthewc	474	}
258	ossman_	1342
259			if (!device_open \|\| (format != current_format))
260	matthewc	474	{
261	ossman_	1346	/*
262			* If we haven't selected a device by now, then either
263			* we've failed to find a working device, or the server
264			* is sending bogus RDPSND_WRITE.
265			*/
266			if (!current_driver)
267			{
268			rdpsnd_send_completion(tick, packet_index);
269			break;
270			}
271	ossman_	1342	if (!device_open && !current_driver->wave_out_open())
272			{
273			rdpsnd_send_completion(tick, packet_index);
274			break;
275			}
276			if (!current_driver->wave_out_set_format(&formats[format]))
277			{
278			rdpsnd_send_completion(tick, packet_index);
279			current_driver->wave_out_close();
280			device_open = False;
281			break;
282			}
283			device_open = True;
284			current_format = format;
285	matthewc	474	}
286
287	ossman_	1342	rdpsnd_queue_write(rdpsnd_dsp_process
288			(s->p, s->end - s->p, current_driver,
289			&formats[current_format]), tick, packet_index);
290			return;
291	astrand	499	break;
292			case RDPSND_CLOSE:
293	ossman_	1343	DEBUG_SOUND(("RDPSND: RDPSND_CLOSE()\n"));
294	ossman_	1346	if (device_open)
295			current_driver->wave_out_close();
296	astrand	499	device_open = False;
297			break;
298			case RDPSND_NEGOTIATE:
299			rdpsnd_process_negotiate(s);
300			break;
301	ossman_	1339	case RDPSND_PING:
302			rdpsnd_process_ping(s);
303	astrand	499	break;
304			case RDPSND_SET_VOLUME:
305	ossman_	1341	in_uint16_le(s, vol_left);
306			in_uint16_le(s, vol_right);
307	ossman_	1343	DEBUG_SOUND(("RDPSND: RDPSND_VOLUME(left: 0x%04x (%u %%), right: 0x%04x (%u %%))\n", (unsigned) vol_left, (unsigned) vol_left / 655, (unsigned) vol_right, (unsigned) vol_right / 655));
308	astrand	499	if (device_open)
309	ossman_	1341	current_driver->wave_out_volume(vol_left, vol_right);
310	astrand	499	break;
311			default:
312	ossman_	1342	unimpl("RDPSND packet type %x\n", opcode);
313	astrand	499	break;
314	matthewc	474	}
315	matthewc	432	}
316
317	ossman_	1342	static void
318			rdpsnd_process(STREAM s)
319			{
320			uint16 len;
321
322			while (!s_check_end(s))
323			{
324			/* New packet */
325			if (packet.size == 0)
326			{
327			if ((s->end - s->p) < 4)
328			{
329			error("RDPSND: Split at packet header. Things will go south from here...\n");
330			return;
331			}
332			in_uint8(s, packet_opcode);
333			in_uint8s(s, 1); /* Padding */
334			in_uint16_le(s, len);
335
336	ossman_	1343	DEBUG_SOUND(("RDPSND: == Opcode %x Length: %d ==\n",
337			(int) packet_opcode, (int) len));
338
339	ossman_	1342	packet.p = packet.data;
340			packet.end = packet.data + len;
341			packet.size = len;
342			}
343			else
344			{
345			len = MIN(s->end - s->p, packet.end - packet.p);
346
347			/* Microsoft's server is so broken it's not even funny... */
348			if (packet_opcode == RDPSND_WRITE)
349			{
350			if ((packet.p - packet.data) < 12)
351			len = MIN(len, 12 - (packet.p - packet.data));
352			else if ((packet.p - packet.data) == 12)
353			{
354	ossman_	1343	DEBUG_SOUND(("RDPSND: Eating 4 bytes of %d bytes...\n",
355			len));
356	ossman_	1342	in_uint8s(s, 4);
357			len -= 4;
358			}
359			}
360
361			in_uint8a(s, packet.p, len);
362			packet.p += len;
363			}
364
365			/* Packet fully assembled */
366			if (packet.p == packet.end)
367			{
368			packet.p = packet.data;
369			rdpsnd_process_packet(packet_opcode, &packet);
370			packet.size = 0;
371			}
372			}
373			}
374
375	stargo	1274	static void
376	stargo	1255	rdpsnd_register_drivers(char *options)
377			{
378			struct audio_driver **reg;
379
380			/* The order of registrations define the probe-order
381			when opening the device for the first time */
382			reg = &drivers;
383			#if defined(RDPSND_ALSA)
384			*reg = alsa_register(options);
385	ossman_	1298	assert(*reg);
386	stargo	1255	reg = &((*reg)->next);
387			#endif
388	stargo	1264	#if defined(RDPSND_SUN)
389			*reg = sun_register(options);
390	ossman_	1298	assert(*reg);
391	stargo	1264	reg = &((*reg)->next);
392			#endif
393	stargo	1255	#if defined(RDPSND_OSS)
394			*reg = oss_register(options);
395	ossman_	1298	assert(*reg);
396	stargo	1255	reg = &((*reg)->next);
397			#endif
398			#if defined(RDPSND_SGI)
399			*reg = sgi_register(options);
400	ossman_	1298	assert(*reg);
401	stargo	1255	reg = &((*reg)->next);
402			#endif
403			#if defined(RDPSND_LIBAO)
404			*reg = libao_register(options);
405	ossman_	1302	assert(*reg);
406	stargo	1255	reg = &((*reg)->next);
407			#endif
408	stargo	1332	*reg = NULL;
409	stargo	1255	}
410
411			BOOL
412	stargo	1272	rdpsnd_init(char *optarg)
413	stargo	1255	{
414			struct audio_driver *pos;
415	stargo	1272	char driver = NULL, options = NULL;
416	stargo	1255
417			drivers = NULL;
418	stargo	1272
419	ossman_	1342	packet.data = xmalloc(65536);
420			packet.p = packet.end = packet.data;
421			packet.size = 0;
422
423	stargo	1272	rdpsnd_channel =
424			channel_register("rdpsnd", CHANNEL_OPTION_INITIALIZED \| CHANNEL_OPTION_ENCRYPT_RDP,
425			rdpsnd_process);
426
427			if (rdpsnd_channel == NULL)
428			{
429			error("channel_register\n");
430			return False;
431			}
432
433	ossman_	1302	rdpsnd_queue_init();
434
435	stargo	1272	if (optarg != NULL && strlen(optarg) > 0)
436			{
437			driver = options = optarg;
438
439			while (options != '\0' && options != ':')
440			options++;
441
442			if (*options == ':')
443			{
444			*options = '\0';
445			options++;
446			}
447
448			if (*options == '\0')
449			options = NULL;
450			}
451
452	stargo	1255	rdpsnd_register_drivers(options);
453
454			if (!driver)
455			return True;
456
457			pos = drivers;
458			while (pos != NULL)
459			{
460			if (!strcmp(pos->name, driver))
461			{
462			DEBUG(("selected %s\n", pos->name));
463			current_driver = pos;
464			return True;
465			}
466			pos = pos->next;
467			}
468			return False;
469			}
470
471			void
472			rdpsnd_show_help(void)
473			{
474			struct audio_driver *pos;
475
476			rdpsnd_register_drivers(NULL);
477
478			pos = drivers;
479			while (pos != NULL)
480			{
481			fprintf(stderr, " %s:\t%s\n", pos->name, pos->description);
482			pos = pos->next;
483			}
484			}
485
486	stargo	1273	void
487	ossman_	1302	rdpsnd_add_fds(int n, fd_set rfds, fd_set * wfds, struct timeval *tv)
488			{
489			long next_pending;
490
491	ossman_	1346	if (device_open)
492			current_driver->add_fds(n, rfds, wfds, tv);
493	ossman_	1302
494			next_pending = rdpsnd_queue_next_completion();
495			if (next_pending >= 0)
496			{
497			long cur_timeout;
498
499			cur_timeout = tv->tv_sec * 1000000 + tv->tv_usec;
500			if (cur_timeout > next_pending)
501			{
502			tv->tv_sec = next_pending / 1000000;
503			tv->tv_usec = next_pending % 1000000;
504			}
505			}
506			}
507
508			void
509			rdpsnd_check_fds(fd_set * rfds, fd_set * wfds)
510			{
511			rdpsnd_queue_complete_pending();
512
513	ossman_	1346	if (device_open)
514			current_driver->check_fds(rfds, wfds);
515	ossman_	1302	}
516
517			static void
518	stargo	1254	rdpsnd_queue_write(STREAM s, uint16 tick, uint8 index)
519			{
520			struct audio_packet *packet = &packet_queue[queue_hi];
521			unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE;
522
523	ossman_	1302	if (next_hi == queue_pending)
524	stargo	1254	{
525			error("No space to queue audio packet\n");
526			return;
527			}
528
529			queue_hi = next_hi;
530
531			packet->s = *s;
532			packet->tick = tick;
533			packet->index = index;
534
535	ossman_	1302	gettimeofday(&packet->arrive_tv, NULL);
536	stargo	1254	}
537
538	ossman_	1299	struct audio_packet *
539	stargo	1254	rdpsnd_queue_current_packet(void)
540			{
541			return &packet_queue[queue_lo];
542			}
543
544	ossman_	1299	BOOL
545	stargo	1254	rdpsnd_queue_empty(void)
546			{
547			return (queue_lo == queue_hi);
548			}
549
550	ossman_	1302	static void
551	stargo	1254	rdpsnd_queue_init(void)
552			{
553	ossman_	1302	queue_pending = queue_lo = queue_hi = 0;
554	stargo	1254	}
555
556	ossman_	1299	void
557	ossman_	1302	rdpsnd_queue_next(unsigned long completed_in_us)
558	stargo	1254	{
559	ossman_	1302	struct audio_packet *packet;
560
561			assert(!rdpsnd_queue_empty());
562
563			packet = &packet_queue[queue_lo];
564
565			gettimeofday(&packet->completion_tv, NULL);
566
567			packet->completion_tv.tv_usec += completed_in_us;
568			packet->completion_tv.tv_sec += packet->completion_tv.tv_usec / 1000000;
569			packet->completion_tv.tv_usec %= 1000000;
570
571	stargo	1254	queue_lo = (queue_lo + 1) % MAX_QUEUE;
572	ossman_	1302
573			rdpsnd_queue_complete_pending();
574	stargo	1254	}
575
576	ossman_	1299	int
577	stargo	1254	rdpsnd_queue_next_tick(void)
578			{
579			if (((queue_lo + 1) % MAX_QUEUE) != queue_hi)
580			{
581			return packet_queue[(queue_lo + 1) % MAX_QUEUE].tick;
582			}
583			else
584			{
585			return (packet_queue[queue_lo].tick + 65535) % 65536;
586			}
587			}
588	ossman_	1302
589			static void
590			rdpsnd_queue_complete_pending(void)
591			{
592			struct timeval now;
593			long elapsed;
594			struct audio_packet *packet;
595
596			gettimeofday(&now, NULL);
597
598			while (queue_pending != queue_lo)
599			{
600			packet = &packet_queue[queue_pending];
601
602			if (now.tv_sec < packet->completion_tv.tv_sec)
603			break;
604
605			if ((now.tv_sec == packet->completion_tv.tv_sec) &&
606			(now.tv_usec < packet->completion_tv.tv_usec))
607			break;
608
609			elapsed = (packet->completion_tv.tv_sec - packet->arrive_tv.tv_sec) * 1000000 +
610			(packet->completion_tv.tv_usec - packet->arrive_tv.tv_usec);
611	ossman_	1337	elapsed /= 1000;
612	ossman_	1302
613			xfree(packet->s.data);
614			rdpsnd_send_completion((packet->tick + elapsed) % 65536, packet->index);
615			queue_pending = (queue_pending + 1) % MAX_QUEUE;
616			}
617			}
618
619			static long
620			rdpsnd_queue_next_completion(void)
621			{
622			struct audio_packet *packet;
623			long remaining;
624			struct timeval now;
625
626			if (queue_pending == queue_lo)
627			return -1;
628
629			gettimeofday(&now, NULL);
630
631			packet = &packet_queue[queue_pending];
632
633			remaining = (packet->completion_tv.tv_sec - now.tv_sec) * 1000000 +
634			(packet->completion_tv.tv_usec - now.tv_usec);
635
636			if (remaining < 0)
637			return 0;
638
639			return remaining;
640			}