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

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, 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 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, pad1: 0x%02x, version: %x)\n",
                     (int) in_format_count, (unsigned) pad1, (unsigned) version));

        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, 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 (!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"));
                        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 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;
}

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)
{
        static struct audio_driver auto_driver;
        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)
        {
                auto_driver.wave_out_open = &rdpsnd_auto_open;
                current_driver = &auto_driver;
                return True;
        }

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

void
rdpsnd_show_help(void)
{
        struct audio_driver *pos;

        rdpsnd_register_drivers(NULL);

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

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

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

        if (g_dsp_busy)
        {
                FD_SET(g_dsp_fd, wfds);
                *n = (g_dsp_fd > *n) ? g_dsp_fd : *n;
        }

        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 (g_dsp_busy && FD_ISSET(g_dsp_fd, wfds))
                rdpsnd_play();
}

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);

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

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	/* -- c-basic-offset: 8 --
2	rdesktop: A Remote Desktop Protocol client.
3	Sound Channel Process Functions
4	Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
5	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	#include <assert.h>
24
25	#include "rdesktop.h"
26	#include "rdpsnd.h"
27	#include "rdpsnd_dsp.h"
28
29	#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	#define RDPSND_PING 6
35	#define RDPSND_NEGOTIATE 7
36
37	#define MAX_FORMATS 10
38	#define MAX_QUEUE 10
39
40	BOOL g_dsp_busy = False;
41	int g_dsp_fd;
42
43	static VCHANNEL *rdpsnd_channel;
44	static struct audio_driver *drivers = NULL;
45	struct audio_driver *current_driver = NULL;
46
47	static BOOL device_open;
48	static WAVEFORMATEX formats[MAX_FORMATS];
49	static unsigned int format_count;
50	static unsigned int current_format;
51	unsigned int queue_hi, queue_lo, queue_pending;
52	struct audio_packet packet_queue[MAX_QUEUE];
53
54	static uint8 packet_opcode;
55	static struct stream packet;
56
57	void (*wave_out_play) (void);
58
59	static void rdpsnd_queue_write(STREAM s, uint16 tick, uint8 index);
60	static void rdpsnd_queue_init(void);
61	static void rdpsnd_queue_complete_pending(void);
62	static long rdpsnd_queue_next_completion(void);
63
64	static STREAM
65	rdpsnd_init_packet(uint16 type, uint16 size)
66	{
67	STREAM s;
68
69	s = channel_init(rdpsnd_channel, size + 4);
70	out_uint16_le(s, type);
71	out_uint16_le(s, size);
72	return s;
73	}
74
75	static void
76	rdpsnd_send(STREAM s)
77	{
78	channel_send(s, rdpsnd_channel);
79	}
80
81	static void
82	rdpsnd_send_completion(uint16 tick, uint8 packet_index)
83	{
84	STREAM s;
85
86	s = rdpsnd_init_packet(RDPSND_COMPLETION, 4);
87	out_uint16_le(s, tick);
88	out_uint8(s, packet_index);
89	out_uint8(s, 0);
90	s_mark_end(s);
91	rdpsnd_send(s);
92
93	DEBUG_SOUND(("RDPSND: -> RDPSND_COMPLETION(tick: %u, index: %u)\n",
94	(unsigned) tick, (unsigned) packet_index));
95	}
96
97	static void
98	rdpsnd_process_negotiate(STREAM in)
99	{
100	uint16 in_format_count, i;
101	uint8 pad;
102	uint16 version;
103	WAVEFORMATEX *format;
104	STREAM out;
105	BOOL device_available = False;
106	int readcnt;
107	int discardcnt;
108
109	in_uint8s(in, 14); /* initial bytes not valid from server */
110	in_uint16_le(in, in_format_count);
111	in_uint8(in, pad);
112	in_uint16_le(in, version);
113	in_uint8s(in, 1); /* padding */
114
115	DEBUG_SOUND(("RDPSND: RDPSND_NEGOTIATE(formats: %d, pad1: 0x%02x, version: %x)\n",
116	(int) in_format_count, (unsigned) pad1, (unsigned) version));
117
118	if (current_driver->wave_out_open())
119	{
120	current_driver->wave_out_close();
121	device_available = True;
122	}
123
124	format_count = 0;
125	if (s_check_rem(in, 18 * in_format_count))
126	{
127	for (i = 0; i < in_format_count; i++)
128	{
129	format = &formats[format_count];
130	in_uint16_le(in, format->wFormatTag);
131	in_uint16_le(in, format->nChannels);
132	in_uint32_le(in, format->nSamplesPerSec);
133	in_uint32_le(in, format->nAvgBytesPerSec);
134	in_uint16_le(in, format->nBlockAlign);
135	in_uint16_le(in, format->wBitsPerSample);
136	in_uint16_le(in, format->cbSize);
137
138	/* read in the buffer of unknown use */
139	readcnt = format->cbSize;
140	discardcnt = 0;
141	if (format->cbSize > MAX_CBSIZE)
142	{
143	fprintf(stderr, "cbSize too large for buffer: %d\n",
144	format->cbSize);
145	readcnt = MAX_CBSIZE;
146	discardcnt = format->cbSize - MAX_CBSIZE;
147	}
148	in_uint8a(in, format->cb, readcnt);
149	in_uint8s(in, discardcnt);
150
151	if (device_available && current_driver->wave_out_format_supported(format))
152	{
153	format_count++;
154	if (format_count == MAX_FORMATS)
155	break;
156	}
157	}
158	}
159
160	out = rdpsnd_init_packet(RDPSND_NEGOTIATE \| 0x200, 20 + 18 * format_count);
161	out_uint32_le(out, 3); /* flags */
162	out_uint32(out, 0xffffffff); /* volume */
163	out_uint32(out, 0); /* pitch */
164	out_uint16(out, 0); /* UDP port */
165
166	out_uint16_le(out, format_count);
167	out_uint8(out, 0); /* padding */
168	out_uint16_le(out, 2); /* version */
169	out_uint8(out, 0); /* padding */
170
171	for (i = 0; i < format_count; i++)
172	{
173	format = &formats[i];
174	out_uint16_le(out, format->wFormatTag);
175	out_uint16_le(out, format->nChannels);
176	out_uint32_le(out, format->nSamplesPerSec);
177	out_uint32_le(out, format->nAvgBytesPerSec);
178	out_uint16_le(out, format->nBlockAlign);
179	out_uint16_le(out, format->wBitsPerSample);
180	out_uint16(out, 0); /* cbSize */
181	}
182
183	s_mark_end(out);
184
185	DEBUG_SOUND(("RDPSND: -> RDPSND_NEGOTIATE(formats: %d)\n", (int) format_count));
186
187	rdpsnd_send(out);
188	}
189
190	static void
191	rdpsnd_process_ping(STREAM in)
192	{
193	uint16 tick;
194	STREAM out;
195
196	in_uint16_le(in, tick);
197
198	DEBUG_SOUND(("RDPSND: RDPSND_PING(tick: 0x%04x)\n", (unsigned) tick));
199
200	out = rdpsnd_init_packet(RDPSND_PING \| 0x2300, 4);
201	out_uint16_le(out, tick);
202	out_uint16_le(out, 0);
203	s_mark_end(out);
204	rdpsnd_send(out);
205
206	DEBUG_SOUND(("RDPSND: -> (tick: 0x%04x)\n", (unsigned) tick));
207	}
208
209	static void
210	rdpsnd_process_packet(uint8 opcode, STREAM s)
211	{
212	uint16 vol_left, vol_right;
213	static uint16 tick, format;
214	static uint8 packet_index;
215
216	switch (opcode)
217	{
218	case RDPSND_WRITE:
219	in_uint16_le(s, tick);
220	in_uint16_le(s, format);
221	in_uint8(s, packet_index);
222	in_uint8s(s, 3);
223	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));
224
225	if (format >= MAX_FORMATS)
226	{
227	error("RDPSND: Invalid format index\n");
228	break;
229	}
230
231	if (!device_open \|\| (format != current_format))
232	{
233	if (!device_open && !current_driver->wave_out_open())
234	{
235	rdpsnd_send_completion(tick, packet_index);
236	break;
237	}
238	if (!current_driver->wave_out_set_format(&formats[format]))
239	{
240	rdpsnd_send_completion(tick, packet_index);
241	current_driver->wave_out_close();
242	device_open = False;
243	break;
244	}
245	device_open = True;
246	current_format = format;
247	}
248
249	rdpsnd_queue_write(rdpsnd_dsp_process
250	(s->p, s->end - s->p, current_driver,
251	&formats[current_format]), tick, packet_index);
252	return;
253	break;
254	case RDPSND_CLOSE:
255	DEBUG_SOUND(("RDPSND: RDPSND_CLOSE()\n"));
256	current_driver->wave_out_close();
257	device_open = False;
258	break;
259	case RDPSND_NEGOTIATE:
260	rdpsnd_process_negotiate(s);
261	break;
262	case RDPSND_PING:
263	rdpsnd_process_ping(s);
264	break;
265	case RDPSND_SET_VOLUME:
266	in_uint16_le(s, vol_left);
267	in_uint16_le(s, vol_right);
268	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));
269	if (device_open)
270	current_driver->wave_out_volume(vol_left, vol_right);
271	break;
272	default:
273	unimpl("RDPSND packet type %x\n", opcode);
274	break;
275	}
276	}
277
278	static void
279	rdpsnd_process(STREAM s)
280	{
281	uint16 len;
282
283	while (!s_check_end(s))
284	{
285	/* New packet */
286	if (packet.size == 0)
287	{
288	if ((s->end - s->p) < 4)
289	{
290	error("RDPSND: Split at packet header. Things will go south from here...\n");
291	return;
292	}
293	in_uint8(s, packet_opcode);
294	in_uint8s(s, 1); /* Padding */
295	in_uint16_le(s, len);
296
297	DEBUG_SOUND(("RDPSND: == Opcode %x Length: %d ==\n",
298	(int) packet_opcode, (int) len));
299
300	packet.p = packet.data;
301	packet.end = packet.data + len;
302	packet.size = len;
303	}
304	else
305	{
306	len = MIN(s->end - s->p, packet.end - packet.p);
307
308	/* Microsoft's server is so broken it's not even funny... */
309	if (packet_opcode == RDPSND_WRITE)
310	{
311	if ((packet.p - packet.data) < 12)
312	len = MIN(len, 12 - (packet.p - packet.data));
313	else if ((packet.p - packet.data) == 12)
314	{
315	DEBUG_SOUND(("RDPSND: Eating 4 bytes of %d bytes...\n",
316	len));
317	in_uint8s(s, 4);
318	len -= 4;
319	}
320	}
321
322	in_uint8a(s, packet.p, len);
323	packet.p += len;
324	}
325
326	/* Packet fully assembled */
327	if (packet.p == packet.end)
328	{
329	packet.p = packet.data;
330	rdpsnd_process_packet(packet_opcode, &packet);
331	packet.size = 0;
332	}
333	}
334	}
335
336	static BOOL
337	rdpsnd_auto_open(void)
338	{
339	static BOOL failed = False;
340
341	if (!failed)
342	{
343	struct audio_driver *auto_driver = current_driver;
344
345	current_driver = drivers;
346	while (current_driver != NULL)
347	{
348	DEBUG(("trying %s...\n", current_driver->name));
349	if (current_driver->wave_out_open())
350	{
351	DEBUG(("selected %s\n", current_driver->name));
352	return True;
353	}
354	g_dsp_fd = 0;
355	current_driver = current_driver->next;
356	}
357
358	warning("no working audio-driver found\n");
359	failed = True;
360	current_driver = auto_driver;
361	}
362
363	return False;
364	}
365
366	static void
367	rdpsnd_register_drivers(char *options)
368	{
369	struct audio_driver **reg;
370
371	/* The order of registrations define the probe-order
372	when opening the device for the first time */
373	reg = &drivers;
374	#if defined(RDPSND_ALSA)
375	*reg = alsa_register(options);
376	assert(*reg);
377	reg = &((*reg)->next);
378	#endif
379	#if defined(RDPSND_SUN)
380	*reg = sun_register(options);
381	assert(*reg);
382	reg = &((*reg)->next);
383	#endif
384	#if defined(RDPSND_OSS)
385	*reg = oss_register(options);
386	assert(*reg);
387	reg = &((*reg)->next);
388	#endif
389	#if defined(RDPSND_SGI)
390	*reg = sgi_register(options);
391	assert(*reg);
392	reg = &((*reg)->next);
393	#endif
394	#if defined(RDPSND_LIBAO)
395	*reg = libao_register(options);
396	assert(*reg);
397	reg = &((*reg)->next);
398	#endif
399	*reg = NULL;
400	}
401
402	BOOL
403	rdpsnd_init(char *optarg)
404	{
405	static struct audio_driver auto_driver;
406	struct audio_driver *pos;
407	char driver = NULL, options = NULL;
408
409	drivers = NULL;
410
411	packet.data = xmalloc(65536);
412	packet.p = packet.end = packet.data;
413	packet.size = 0;
414
415	rdpsnd_channel =
416	channel_register("rdpsnd", CHANNEL_OPTION_INITIALIZED \| CHANNEL_OPTION_ENCRYPT_RDP,
417	rdpsnd_process);
418
419	if (rdpsnd_channel == NULL)
420	{
421	error("channel_register\n");
422	return False;
423	}
424
425	rdpsnd_queue_init();
426
427	if (optarg != NULL && strlen(optarg) > 0)
428	{
429	driver = options = optarg;
430
431	while (options != '\0' && options != ':')
432	options++;
433
434	if (*options == ':')
435	{
436	*options = '\0';
437	options++;
438	}
439
440	if (*options == '\0')
441	options = NULL;
442	}
443
444	rdpsnd_register_drivers(options);
445
446	if (!driver)
447	{
448	auto_driver.wave_out_open = &rdpsnd_auto_open;
449	current_driver = &auto_driver;
450	return True;
451	}
452
453	pos = drivers;
454	while (pos != NULL)
455	{
456	if (!strcmp(pos->name, driver))
457	{
458	DEBUG(("selected %s\n", pos->name));
459	current_driver = pos;
460	return True;
461	}
462	pos = pos->next;
463	}
464	return False;
465	}
466
467	void
468	rdpsnd_show_help(void)
469	{
470	struct audio_driver *pos;
471
472	rdpsnd_register_drivers(NULL);
473
474	pos = drivers;
475	while (pos != NULL)
476	{
477	fprintf(stderr, " %s:\t%s\n", pos->name, pos->description);
478	pos = pos->next;
479	}
480	}
481
482	void
483	rdpsnd_play(void)
484	{
485	current_driver->wave_out_play();
486	}
487
488	void
489	rdpsnd_add_fds(int n, fd_set rfds, fd_set * wfds, struct timeval *tv)
490	{
491	long next_pending;
492
493	if (g_dsp_busy)
494	{
495	FD_SET(g_dsp_fd, wfds);
496	n = (g_dsp_fd > n) ? g_dsp_fd : *n;
497	}
498
499	next_pending = rdpsnd_queue_next_completion();
500	if (next_pending >= 0)
501	{
502	long cur_timeout;
503
504	cur_timeout = tv->tv_sec * 1000000 + tv->tv_usec;
505	if (cur_timeout > next_pending)
506	{
507	tv->tv_sec = next_pending / 1000000;
508	tv->tv_usec = next_pending % 1000000;
509	}
510	}
511	}
512
513	void
514	rdpsnd_check_fds(fd_set * rfds, fd_set * wfds)
515	{
516	rdpsnd_queue_complete_pending();
517
518	if (g_dsp_busy && FD_ISSET(g_dsp_fd, wfds))
519	rdpsnd_play();
520	}
521
522	static void
523	rdpsnd_queue_write(STREAM s, uint16 tick, uint8 index)
524	{
525	struct audio_packet *packet = &packet_queue[queue_hi];
526	unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE;
527
528	if (next_hi == queue_pending)
529	{
530	error("No space to queue audio packet\n");
531	return;
532	}
533
534	queue_hi = next_hi;
535
536	packet->s = *s;
537	packet->tick = tick;
538	packet->index = index;
539
540	gettimeofday(&packet->arrive_tv, NULL);
541
542	if (!g_dsp_busy)
543	current_driver->wave_out_play();
544	}
545
546	struct audio_packet *
547	rdpsnd_queue_current_packet(void)
548	{
549	return &packet_queue[queue_lo];
550	}
551
552	BOOL
553	rdpsnd_queue_empty(void)
554	{
555	return (queue_lo == queue_hi);
556	}
557
558	static void
559	rdpsnd_queue_init(void)
560	{
561	queue_pending = queue_lo = queue_hi = 0;
562	}
563
564	void
565	rdpsnd_queue_next(unsigned long completed_in_us)
566	{
567	struct audio_packet *packet;
568
569	assert(!rdpsnd_queue_empty());
570
571	packet = &packet_queue[queue_lo];
572
573	gettimeofday(&packet->completion_tv, NULL);
574
575	packet->completion_tv.tv_usec += completed_in_us;
576	packet->completion_tv.tv_sec += packet->completion_tv.tv_usec / 1000000;
577	packet->completion_tv.tv_usec %= 1000000;
578
579	queue_lo = (queue_lo + 1) % MAX_QUEUE;
580
581	rdpsnd_queue_complete_pending();
582	}
583
584	int
585	rdpsnd_queue_next_tick(void)
586	{
587	if (((queue_lo + 1) % MAX_QUEUE) != queue_hi)
588	{
589	return packet_queue[(queue_lo + 1) % MAX_QUEUE].tick;
590	}
591	else
592	{
593	return (packet_queue[queue_lo].tick + 65535) % 65536;
594	}
595	}
596
597	static void
598	rdpsnd_queue_complete_pending(void)
599	{
600	struct timeval now;
601	long elapsed;
602	struct audio_packet *packet;
603
604	gettimeofday(&now, NULL);
605
606	while (queue_pending != queue_lo)
607	{
608	packet = &packet_queue[queue_pending];
609
610	if (now.tv_sec < packet->completion_tv.tv_sec)
611	break;
612
613	if ((now.tv_sec == packet->completion_tv.tv_sec) &&
614	(now.tv_usec < packet->completion_tv.tv_usec))
615	break;
616
617	elapsed = (packet->completion_tv.tv_sec - packet->arrive_tv.tv_sec) * 1000000 +
618	(packet->completion_tv.tv_usec - packet->arrive_tv.tv_usec);
619	elapsed /= 1000;
620
621	xfree(packet->s.data);
622	rdpsnd_send_completion((packet->tick + elapsed) % 65536, packet->index);
623	queue_pending = (queue_pending + 1) % MAX_QUEUE;
624	}
625	}
626
627	static long
628	rdpsnd_queue_next_completion(void)
629	{
630	struct audio_packet *packet;
631	long remaining;
632	struct timeval now;
633
634	if (queue_pending == queue_lo)
635	return -1;
636
637	gettimeofday(&now, NULL);
638
639	packet = &packet_queue[queue_pending];
640
641	remaining = (packet->completion_tv.tv_sec - now.tv_sec) * 1000000 +
642	(packet->completion_tv.tv_usec - now.tv_usec);
643
644	if (remaining < 0)
645	return 0;
646
647	return remaining;
648	}