| 1 |
/* -*- c-basic-offset: 8 -*- |
| 2 |
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 |
#include <assert.h> |
| 23 |
|
| 24 |
#include "rdesktop.h" |
| 25 |
#include "rdpsnd.h" |
| 26 |
#include "rdpsnd_dsp.h" |
| 27 |
|
| 28 |
#define RDPSND_CLOSE 1 |
| 29 |
#define RDPSND_WRITE 2 |
| 30 |
#define RDPSND_SET_VOLUME 3 |
| 31 |
#define RDPSND_UNKNOWN4 4 |
| 32 |
#define RDPSND_COMPLETION 5 |
| 33 |
#define RDPSND_PING 6 |
| 34 |
#define RDPSND_NEGOTIATE 7 |
| 35 |
|
| 36 |
#define MAX_FORMATS 10 |
| 37 |
#define MAX_QUEUE 10 |
| 38 |
|
| 39 |
BOOL g_dsp_busy = False; |
| 40 |
int g_dsp_fd; |
| 41 |
|
| 42 |
static VCHANNEL *rdpsnd_channel; |
| 43 |
static struct audio_driver *drivers = NULL; |
| 44 |
struct audio_driver *current_driver = NULL; |
| 45 |
|
| 46 |
static BOOL device_open; |
| 47 |
static WAVEFORMATEX formats[MAX_FORMATS]; |
| 48 |
static unsigned int format_count; |
| 49 |
static unsigned int current_format; |
| 50 |
unsigned int queue_hi, queue_lo, queue_pending; |
| 51 |
struct audio_packet packet_queue[MAX_QUEUE]; |
| 52 |
|
| 53 |
void (*wave_out_play) (void); |
| 54 |
|
| 55 |
static void rdpsnd_queue_write(STREAM s, uint16 tick, uint8 index); |
| 56 |
static void rdpsnd_queue_init(void); |
| 57 |
static void rdpsnd_queue_complete_pending(void); |
| 58 |
static long rdpsnd_queue_next_completion(void); |
| 59 |
|
| 60 |
static STREAM |
| 61 |
rdpsnd_init_packet(uint16 type, uint16 size) |
| 62 |
{ |
| 63 |
STREAM s; |
| 64 |
|
| 65 |
s = channel_init(rdpsnd_channel, size + 4); |
| 66 |
out_uint16_le(s, type); |
| 67 |
out_uint16_le(s, size); |
| 68 |
return s; |
| 69 |
} |
| 70 |
|
| 71 |
static void |
| 72 |
rdpsnd_send(STREAM s) |
| 73 |
{ |
| 74 |
#ifdef RDPSND_DEBUG |
| 75 |
printf("RDPSND send:\n"); |
| 76 |
hexdump(s->channel_hdr + 8, s->end - s->channel_hdr - 8); |
| 77 |
#endif |
| 78 |
|
| 79 |
channel_send(s, rdpsnd_channel); |
| 80 |
} |
| 81 |
|
| 82 |
static void |
| 83 |
rdpsnd_send_completion(uint16 tick, uint8 packet_index) |
| 84 |
{ |
| 85 |
STREAM s; |
| 86 |
|
| 87 |
s = rdpsnd_init_packet(RDPSND_COMPLETION, 4); |
| 88 |
out_uint16_le(s, tick); |
| 89 |
out_uint8(s, packet_index); |
| 90 |
out_uint8(s, 0); |
| 91 |
s_mark_end(s); |
| 92 |
rdpsnd_send(s); |
| 93 |
} |
| 94 |
|
| 95 |
static void |
| 96 |
rdpsnd_process_negotiate(STREAM in) |
| 97 |
{ |
| 98 |
uint16 in_format_count, i; |
| 99 |
uint8 pad; |
| 100 |
uint16 version; |
| 101 |
WAVEFORMATEX *format; |
| 102 |
STREAM out; |
| 103 |
BOOL device_available = False; |
| 104 |
int readcnt; |
| 105 |
int discardcnt; |
| 106 |
|
| 107 |
in_uint8s(in, 14); /* initial bytes not valid from server */ |
| 108 |
in_uint16_le(in, in_format_count); |
| 109 |
in_uint8(in, pad); |
| 110 |
in_uint16_le(in, version); |
| 111 |
in_uint8s(in, 1); /* padding */ |
| 112 |
|
| 113 |
if (current_driver->wave_out_open()) |
| 114 |
{ |
| 115 |
current_driver->wave_out_close(); |
| 116 |
device_available = True; |
| 117 |
} |
| 118 |
|
| 119 |
format_count = 0; |
| 120 |
if (s_check_rem(in, 18 * in_format_count)) |
| 121 |
{ |
| 122 |
for (i = 0; i < in_format_count; i++) |
| 123 |
{ |
| 124 |
format = &formats[format_count]; |
| 125 |
in_uint16_le(in, format->wFormatTag); |
| 126 |
in_uint16_le(in, format->nChannels); |
| 127 |
in_uint32_le(in, format->nSamplesPerSec); |
| 128 |
in_uint32_le(in, format->nAvgBytesPerSec); |
| 129 |
in_uint16_le(in, format->nBlockAlign); |
| 130 |
in_uint16_le(in, format->wBitsPerSample); |
| 131 |
in_uint16_le(in, format->cbSize); |
| 132 |
|
| 133 |
/* read in the buffer of unknown use */ |
| 134 |
readcnt = format->cbSize; |
| 135 |
discardcnt = 0; |
| 136 |
if (format->cbSize > MAX_CBSIZE) |
| 137 |
{ |
| 138 |
fprintf(stderr, "cbSize too large for buffer: %d\n", |
| 139 |
format->cbSize); |
| 140 |
readcnt = MAX_CBSIZE; |
| 141 |
discardcnt = format->cbSize - MAX_CBSIZE; |
| 142 |
} |
| 143 |
in_uint8a(in, format->cb, readcnt); |
| 144 |
in_uint8s(in, discardcnt); |
| 145 |
|
| 146 |
if (device_available && current_driver->wave_out_format_supported(format)) |
| 147 |
{ |
| 148 |
format_count++; |
| 149 |
if (format_count == MAX_FORMATS) |
| 150 |
break; |
| 151 |
} |
| 152 |
} |
| 153 |
} |
| 154 |
|
| 155 |
out = rdpsnd_init_packet(RDPSND_NEGOTIATE | 0x200, 20 + 18 * format_count); |
| 156 |
out_uint32_le(out, 3); /* flags */ |
| 157 |
out_uint32(out, 0xffffffff); /* volume */ |
| 158 |
out_uint32(out, 0); /* pitch */ |
| 159 |
out_uint16(out, 0); /* UDP port */ |
| 160 |
|
| 161 |
out_uint16_le(out, format_count); |
| 162 |
out_uint8(out, 0); /* padding */ |
| 163 |
out_uint16_le(out, 2); /* version */ |
| 164 |
out_uint8(out, 0); /* padding */ |
| 165 |
|
| 166 |
for (i = 0; i < format_count; i++) |
| 167 |
{ |
| 168 |
format = &formats[i]; |
| 169 |
out_uint16_le(out, format->wFormatTag); |
| 170 |
out_uint16_le(out, format->nChannels); |
| 171 |
out_uint32_le(out, format->nSamplesPerSec); |
| 172 |
out_uint32_le(out, format->nAvgBytesPerSec); |
| 173 |
out_uint16_le(out, format->nBlockAlign); |
| 174 |
out_uint16_le(out, format->wBitsPerSample); |
| 175 |
out_uint16(out, 0); /* cbSize */ |
| 176 |
} |
| 177 |
|
| 178 |
s_mark_end(out); |
| 179 |
rdpsnd_send(out); |
| 180 |
} |
| 181 |
|
| 182 |
static void |
| 183 |
rdpsnd_process_ping(STREAM in) |
| 184 |
{ |
| 185 |
uint16 tick; |
| 186 |
STREAM out; |
| 187 |
|
| 188 |
in_uint16_le(in, tick); |
| 189 |
|
| 190 |
out = rdpsnd_init_packet(RDPSND_PING | 0x2300, 4); |
| 191 |
out_uint16_le(out, tick); |
| 192 |
out_uint16_le(out, 0); |
| 193 |
s_mark_end(out); |
| 194 |
rdpsnd_send(out); |
| 195 |
} |
| 196 |
|
| 197 |
static void |
| 198 |
rdpsnd_process(STREAM s) |
| 199 |
{ |
| 200 |
uint8 type; |
| 201 |
uint16 datalen; |
| 202 |
uint32 volume; |
| 203 |
static uint16 tick, format; |
| 204 |
static uint8 packet_index; |
| 205 |
static BOOL awaiting_data_packet; |
| 206 |
static unsigned char missing_bytes[4] = { 0, 0, 0, 0 }; |
| 207 |
|
| 208 |
#ifdef RDPSND_DEBUG |
| 209 |
printf("RDPSND recv:\n"); |
| 210 |
hexdump(s->p, s->end - s->p); |
| 211 |
#endif |
| 212 |
|
| 213 |
if (awaiting_data_packet) |
| 214 |
{ |
| 215 |
if (format >= MAX_FORMATS) |
| 216 |
{ |
| 217 |
error("RDPSND: Invalid format index\n"); |
| 218 |
return; |
| 219 |
} |
| 220 |
|
| 221 |
if (!device_open || (format != current_format)) |
| 222 |
{ |
| 223 |
if (!device_open && !current_driver->wave_out_open()) |
| 224 |
{ |
| 225 |
rdpsnd_send_completion(tick, packet_index); |
| 226 |
return; |
| 227 |
} |
| 228 |
if (!current_driver->wave_out_set_format(&formats[format])) |
| 229 |
{ |
| 230 |
rdpsnd_send_completion(tick, packet_index); |
| 231 |
current_driver->wave_out_close(); |
| 232 |
device_open = False; |
| 233 |
return; |
| 234 |
} |
| 235 |
device_open = True; |
| 236 |
current_format = format; |
| 237 |
} |
| 238 |
|
| 239 |
/* Insert the 4 missing bytes retrieved from last RDPSND_WRITE */ |
| 240 |
memcpy(s->data, missing_bytes, 4); |
| 241 |
|
| 242 |
rdpsnd_queue_write(rdpsnd_dsp_process |
| 243 |
(s, current_driver, &formats[current_format]), tick, |
| 244 |
packet_index); |
| 245 |
awaiting_data_packet = False; |
| 246 |
return; |
| 247 |
} |
| 248 |
|
| 249 |
in_uint8(s, type); |
| 250 |
in_uint8s(s, 1); /* unknown? */ |
| 251 |
in_uint16_le(s, datalen); |
| 252 |
|
| 253 |
switch (type) |
| 254 |
{ |
| 255 |
case RDPSND_WRITE: |
| 256 |
in_uint16_le(s, tick); |
| 257 |
in_uint16_le(s, format); |
| 258 |
in_uint8(s, packet_index); |
| 259 |
/* Here are our lost bytes, but why? */ |
| 260 |
memcpy(missing_bytes, s->end - 4, 4); |
| 261 |
awaiting_data_packet = True; |
| 262 |
break; |
| 263 |
case RDPSND_CLOSE: |
| 264 |
current_driver->wave_out_close(); |
| 265 |
device_open = False; |
| 266 |
break; |
| 267 |
case RDPSND_NEGOTIATE: |
| 268 |
rdpsnd_process_negotiate(s); |
| 269 |
break; |
| 270 |
case RDPSND_PING: |
| 271 |
rdpsnd_process_ping(s); |
| 272 |
break; |
| 273 |
case RDPSND_SET_VOLUME: |
| 274 |
in_uint32(s, volume); |
| 275 |
if (device_open) |
| 276 |
{ |
| 277 |
current_driver->wave_out_volume((volume & 0xffff), |
| 278 |
(volume & 0xffff0000) >> 16); |
| 279 |
} |
| 280 |
break; |
| 281 |
default: |
| 282 |
unimpl("RDPSND packet type %d\n", type); |
| 283 |
break; |
| 284 |
} |
| 285 |
} |
| 286 |
|
| 287 |
static BOOL |
| 288 |
rdpsnd_auto_open(void) |
| 289 |
{ |
| 290 |
static BOOL failed = False; |
| 291 |
|
| 292 |
if (!failed) |
| 293 |
{ |
| 294 |
struct audio_driver *auto_driver = current_driver; |
| 295 |
|
| 296 |
current_driver = drivers; |
| 297 |
while (current_driver != NULL) |
| 298 |
{ |
| 299 |
DEBUG(("trying %s...\n", current_driver->name)); |
| 300 |
if (current_driver->wave_out_open()) |
| 301 |
{ |
| 302 |
DEBUG(("selected %s\n", current_driver->name)); |
| 303 |
return True; |
| 304 |
} |
| 305 |
g_dsp_fd = 0; |
| 306 |
current_driver = current_driver->next; |
| 307 |
} |
| 308 |
|
| 309 |
warning("no working audio-driver found\n"); |
| 310 |
failed = True; |
| 311 |
current_driver = auto_driver; |
| 312 |
} |
| 313 |
|
| 314 |
return False; |
| 315 |
} |
| 316 |
|
| 317 |
static void |
| 318 |
rdpsnd_register_drivers(char *options) |
| 319 |
{ |
| 320 |
struct audio_driver **reg; |
| 321 |
|
| 322 |
/* The order of registrations define the probe-order |
| 323 |
when opening the device for the first time */ |
| 324 |
reg = &drivers; |
| 325 |
#if defined(RDPSND_ALSA) |
| 326 |
*reg = alsa_register(options); |
| 327 |
assert(*reg); |
| 328 |
reg = &((*reg)->next); |
| 329 |
#endif |
| 330 |
#if defined(RDPSND_SUN) |
| 331 |
*reg = sun_register(options); |
| 332 |
assert(*reg); |
| 333 |
reg = &((*reg)->next); |
| 334 |
#endif |
| 335 |
#if defined(RDPSND_OSS) |
| 336 |
*reg = oss_register(options); |
| 337 |
assert(*reg); |
| 338 |
reg = &((*reg)->next); |
| 339 |
#endif |
| 340 |
#if defined(RDPSND_SGI) |
| 341 |
*reg = sgi_register(options); |
| 342 |
assert(*reg); |
| 343 |
reg = &((*reg)->next); |
| 344 |
#endif |
| 345 |
#if defined(RDPSND_LIBAO) |
| 346 |
*reg = libao_register(options); |
| 347 |
assert(*reg); |
| 348 |
reg = &((*reg)->next); |
| 349 |
#endif |
| 350 |
*reg = NULL; |
| 351 |
} |
| 352 |
|
| 353 |
BOOL |
| 354 |
rdpsnd_init(char *optarg) |
| 355 |
{ |
| 356 |
static struct audio_driver auto_driver; |
| 357 |
struct audio_driver *pos; |
| 358 |
char *driver = NULL, *options = NULL; |
| 359 |
|
| 360 |
drivers = NULL; |
| 361 |
|
| 362 |
rdpsnd_channel = |
| 363 |
channel_register("rdpsnd", CHANNEL_OPTION_INITIALIZED | CHANNEL_OPTION_ENCRYPT_RDP, |
| 364 |
rdpsnd_process); |
| 365 |
|
| 366 |
if (rdpsnd_channel == NULL) |
| 367 |
{ |
| 368 |
error("channel_register\n"); |
| 369 |
return False; |
| 370 |
} |
| 371 |
|
| 372 |
rdpsnd_queue_init(); |
| 373 |
|
| 374 |
if (optarg != NULL && strlen(optarg) > 0) |
| 375 |
{ |
| 376 |
driver = options = optarg; |
| 377 |
|
| 378 |
while (*options != '\0' && *options != ':') |
| 379 |
options++; |
| 380 |
|
| 381 |
if (*options == ':') |
| 382 |
{ |
| 383 |
*options = '\0'; |
| 384 |
options++; |
| 385 |
} |
| 386 |
|
| 387 |
if (*options == '\0') |
| 388 |
options = NULL; |
| 389 |
} |
| 390 |
|
| 391 |
rdpsnd_register_drivers(options); |
| 392 |
|
| 393 |
if (!driver) |
| 394 |
{ |
| 395 |
auto_driver.wave_out_open = &rdpsnd_auto_open; |
| 396 |
current_driver = &auto_driver; |
| 397 |
return True; |
| 398 |
} |
| 399 |
|
| 400 |
pos = drivers; |
| 401 |
while (pos != NULL) |
| 402 |
{ |
| 403 |
if (!strcmp(pos->name, driver)) |
| 404 |
{ |
| 405 |
DEBUG(("selected %s\n", pos->name)); |
| 406 |
current_driver = pos; |
| 407 |
return True; |
| 408 |
} |
| 409 |
pos = pos->next; |
| 410 |
} |
| 411 |
return False; |
| 412 |
} |
| 413 |
|
| 414 |
void |
| 415 |
rdpsnd_show_help(void) |
| 416 |
{ |
| 417 |
struct audio_driver *pos; |
| 418 |
|
| 419 |
rdpsnd_register_drivers(NULL); |
| 420 |
|
| 421 |
pos = drivers; |
| 422 |
while (pos != NULL) |
| 423 |
{ |
| 424 |
fprintf(stderr, " %s:\t%s\n", pos->name, pos->description); |
| 425 |
pos = pos->next; |
| 426 |
} |
| 427 |
} |
| 428 |
|
| 429 |
void |
| 430 |
rdpsnd_play(void) |
| 431 |
{ |
| 432 |
current_driver->wave_out_play(); |
| 433 |
} |
| 434 |
|
| 435 |
void |
| 436 |
rdpsnd_add_fds(int *n, fd_set * rfds, fd_set * wfds, struct timeval *tv) |
| 437 |
{ |
| 438 |
long next_pending; |
| 439 |
|
| 440 |
if (g_dsp_busy) |
| 441 |
{ |
| 442 |
FD_SET(g_dsp_fd, wfds); |
| 443 |
*n = (g_dsp_fd > *n) ? g_dsp_fd : *n; |
| 444 |
} |
| 445 |
|
| 446 |
next_pending = rdpsnd_queue_next_completion(); |
| 447 |
if (next_pending >= 0) |
| 448 |
{ |
| 449 |
long cur_timeout; |
| 450 |
|
| 451 |
cur_timeout = tv->tv_sec * 1000000 + tv->tv_usec; |
| 452 |
if (cur_timeout > next_pending) |
| 453 |
{ |
| 454 |
tv->tv_sec = next_pending / 1000000; |
| 455 |
tv->tv_usec = next_pending % 1000000; |
| 456 |
} |
| 457 |
} |
| 458 |
} |
| 459 |
|
| 460 |
void |
| 461 |
rdpsnd_check_fds(fd_set * rfds, fd_set * wfds) |
| 462 |
{ |
| 463 |
rdpsnd_queue_complete_pending(); |
| 464 |
|
| 465 |
if (g_dsp_busy && FD_ISSET(g_dsp_fd, wfds)) |
| 466 |
rdpsnd_play(); |
| 467 |
} |
| 468 |
|
| 469 |
static void |
| 470 |
rdpsnd_queue_write(STREAM s, uint16 tick, uint8 index) |
| 471 |
{ |
| 472 |
struct audio_packet *packet = &packet_queue[queue_hi]; |
| 473 |
unsigned int next_hi = (queue_hi + 1) % MAX_QUEUE; |
| 474 |
|
| 475 |
if (next_hi == queue_pending) |
| 476 |
{ |
| 477 |
error("No space to queue audio packet\n"); |
| 478 |
return; |
| 479 |
} |
| 480 |
|
| 481 |
queue_hi = next_hi; |
| 482 |
|
| 483 |
packet->s = *s; |
| 484 |
packet->tick = tick; |
| 485 |
packet->index = index; |
| 486 |
|
| 487 |
gettimeofday(&packet->arrive_tv, NULL); |
| 488 |
|
| 489 |
if (!g_dsp_busy) |
| 490 |
current_driver->wave_out_play(); |
| 491 |
} |
| 492 |
|
| 493 |
struct audio_packet * |
| 494 |
rdpsnd_queue_current_packet(void) |
| 495 |
{ |
| 496 |
return &packet_queue[queue_lo]; |
| 497 |
} |
| 498 |
|
| 499 |
BOOL |
| 500 |
rdpsnd_queue_empty(void) |
| 501 |
{ |
| 502 |
return (queue_lo == queue_hi); |
| 503 |
} |
| 504 |
|
| 505 |
static void |
| 506 |
rdpsnd_queue_init(void) |
| 507 |
{ |
| 508 |
queue_pending = queue_lo = queue_hi = 0; |
| 509 |
} |
| 510 |
|
| 511 |
void |
| 512 |
rdpsnd_queue_next(unsigned long completed_in_us) |
| 513 |
{ |
| 514 |
struct audio_packet *packet; |
| 515 |
|
| 516 |
assert(!rdpsnd_queue_empty()); |
| 517 |
|
| 518 |
packet = &packet_queue[queue_lo]; |
| 519 |
|
| 520 |
gettimeofday(&packet->completion_tv, NULL); |
| 521 |
|
| 522 |
packet->completion_tv.tv_usec += completed_in_us; |
| 523 |
packet->completion_tv.tv_sec += packet->completion_tv.tv_usec / 1000000; |
| 524 |
packet->completion_tv.tv_usec %= 1000000; |
| 525 |
|
| 526 |
queue_lo = (queue_lo + 1) % MAX_QUEUE; |
| 527 |
|
| 528 |
rdpsnd_queue_complete_pending(); |
| 529 |
} |
| 530 |
|
| 531 |
int |
| 532 |
rdpsnd_queue_next_tick(void) |
| 533 |
{ |
| 534 |
if (((queue_lo + 1) % MAX_QUEUE) != queue_hi) |
| 535 |
{ |
| 536 |
return packet_queue[(queue_lo + 1) % MAX_QUEUE].tick; |
| 537 |
} |
| 538 |
else |
| 539 |
{ |
| 540 |
return (packet_queue[queue_lo].tick + 65535) % 65536; |
| 541 |
} |
| 542 |
} |
| 543 |
|
| 544 |
static void |
| 545 |
rdpsnd_queue_complete_pending(void) |
| 546 |
{ |
| 547 |
struct timeval now; |
| 548 |
long elapsed; |
| 549 |
struct audio_packet *packet; |
| 550 |
|
| 551 |
gettimeofday(&now, NULL); |
| 552 |
|
| 553 |
while (queue_pending != queue_lo) |
| 554 |
{ |
| 555 |
packet = &packet_queue[queue_pending]; |
| 556 |
|
| 557 |
if (now.tv_sec < packet->completion_tv.tv_sec) |
| 558 |
break; |
| 559 |
|
| 560 |
if ((now.tv_sec == packet->completion_tv.tv_sec) && |
| 561 |
(now.tv_usec < packet->completion_tv.tv_usec)) |
| 562 |
break; |
| 563 |
|
| 564 |
elapsed = (packet->completion_tv.tv_sec - packet->arrive_tv.tv_sec) * 1000000 + |
| 565 |
(packet->completion_tv.tv_usec - packet->arrive_tv.tv_usec); |
| 566 |
elapsed /= 1000; |
| 567 |
|
| 568 |
xfree(packet->s.data); |
| 569 |
rdpsnd_send_completion((packet->tick + elapsed) % 65536, packet->index); |
| 570 |
queue_pending = (queue_pending + 1) % MAX_QUEUE; |
| 571 |
} |
| 572 |
} |
| 573 |
|
| 574 |
static long |
| 575 |
rdpsnd_queue_next_completion(void) |
| 576 |
{ |
| 577 |
struct audio_packet *packet; |
| 578 |
long remaining; |
| 579 |
struct timeval now; |
| 580 |
|
| 581 |
if (queue_pending == queue_lo) |
| 582 |
return -1; |
| 583 |
|
| 584 |
gettimeofday(&now, NULL); |
| 585 |
|
| 586 |
packet = &packet_queue[queue_pending]; |
| 587 |
|
| 588 |
remaining = (packet->completion_tv.tv_sec - now.tv_sec) * 1000000 + |
| 589 |
(packet->completion_tv.tv_usec - now.tv_usec); |
| 590 |
|
| 591 |
if (remaining < 0) |
| 592 |
return 0; |
| 593 |
|
| 594 |
return remaining; |
| 595 |
} |
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