Karsten Wiese | 030a07e | 2008-07-30 15:13:29 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007, 2008 Karsten Wiese <fzu@wemgehoertderstaat.de> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License as published by the |
| 6 | * Free Software Foundation; either version 2 of the License, or (at your |
| 7 | * option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 11 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software Foundation, |
| 16 | * Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/usb.h> |
| 20 | |
| 21 | #include "usb_stream.h" |
| 22 | |
| 23 | |
| 24 | /* setup */ |
| 25 | |
| 26 | static unsigned usb_stream_next_packet_size(struct usb_stream_kernel *sk) |
| 27 | { |
| 28 | struct usb_stream *s = sk->s; |
| 29 | sk->out_phase_peeked = (sk->out_phase & 0xffff) + sk->freqn; |
| 30 | return (sk->out_phase_peeked >> 16) * s->cfg.frame_size; |
| 31 | } |
| 32 | |
| 33 | static void playback_prep_freqn(struct usb_stream_kernel *sk, struct urb *urb) |
| 34 | { |
| 35 | struct usb_stream *s = sk->s; |
| 36 | unsigned l = 0; |
| 37 | int pack; |
| 38 | |
| 39 | urb->iso_frame_desc[0].offset = 0; |
| 40 | urb->iso_frame_desc[0].length = usb_stream_next_packet_size(sk); |
| 41 | sk->out_phase = sk->out_phase_peeked; |
| 42 | urb->transfer_buffer_length = urb->iso_frame_desc[0].length; |
| 43 | |
| 44 | for (pack = 1; pack < sk->n_o_ps; pack++) { |
| 45 | l = usb_stream_next_packet_size(sk); |
| 46 | if (s->idle_outsize + urb->transfer_buffer_length + l > |
| 47 | s->period_size) |
| 48 | goto check; |
| 49 | |
| 50 | sk->out_phase = sk->out_phase_peeked; |
| 51 | urb->iso_frame_desc[pack].offset = urb->transfer_buffer_length; |
| 52 | urb->iso_frame_desc[pack].length = l; |
| 53 | urb->transfer_buffer_length += l; |
| 54 | } |
| 55 | snd_printdd(KERN_DEBUG "%i\n", urb->transfer_buffer_length); |
| 56 | |
| 57 | check: |
| 58 | urb->number_of_packets = pack; |
| 59 | s->idle_outsize += urb->transfer_buffer_length - s->period_size; |
| 60 | snd_printdd(KERN_DEBUG "idle=%i ul=%i ps=%i\n", s->idle_outsize, |
| 61 | urb->transfer_buffer_length, s->period_size); |
| 62 | } |
| 63 | |
| 64 | static void init_pipe_urbs(struct usb_stream_kernel *sk, unsigned use_packsize, |
| 65 | struct urb **urbs, char *transfer, |
| 66 | struct usb_device *dev, int pipe) |
| 67 | { |
| 68 | int u, p; |
| 69 | int maxpacket = use_packsize ? |
| 70 | use_packsize : usb_maxpacket(dev, pipe, usb_pipeout(pipe)); |
| 71 | int transfer_length = maxpacket * sk->n_o_ps; |
| 72 | |
| 73 | for (u = 0; u < USB_STREAM_NURBS; |
| 74 | ++u, transfer += transfer_length) { |
| 75 | struct urb *urb = urbs[u]; |
| 76 | struct usb_iso_packet_descriptor *desc; |
| 77 | urb->transfer_flags = URB_ISO_ASAP; |
| 78 | urb->transfer_buffer = transfer; |
| 79 | urb->dev = dev; |
| 80 | urb->pipe = pipe; |
| 81 | urb->number_of_packets = sk->n_o_ps; |
| 82 | urb->context = sk; |
| 83 | urb->interval = 1; |
| 84 | if (usb_pipeout(pipe)) |
| 85 | continue; |
| 86 | |
| 87 | urb->transfer_buffer_length = transfer_length; |
| 88 | desc = urb->iso_frame_desc; |
| 89 | desc->offset = 0; |
| 90 | desc->length = maxpacket; |
| 91 | for (p = 1; p < sk->n_o_ps; ++p) { |
| 92 | desc[p].offset = desc[p - 1].offset + maxpacket; |
| 93 | desc[p].length = maxpacket; |
| 94 | } |
| 95 | } |
| 96 | } |
| 97 | |
| 98 | static void init_urbs(struct usb_stream_kernel *sk, unsigned use_packsize, |
| 99 | struct usb_device *dev, int in_pipe, int out_pipe) |
| 100 | { |
| 101 | struct usb_stream *s = sk->s; |
| 102 | char *indata = (char *)s + sizeof(*s) + |
| 103 | sizeof(struct usb_stream_packet) * |
| 104 | s->inpackets; |
| 105 | int u; |
| 106 | |
| 107 | for (u = 0; u < USB_STREAM_NURBS; ++u) { |
| 108 | sk->inurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL); |
| 109 | sk->outurb[u] = usb_alloc_urb(sk->n_o_ps, GFP_KERNEL); |
| 110 | } |
| 111 | |
| 112 | init_pipe_urbs(sk, use_packsize, sk->inurb, indata, dev, in_pipe); |
| 113 | init_pipe_urbs(sk, use_packsize, sk->outurb, sk->write_page, dev, |
| 114 | out_pipe); |
| 115 | } |
| 116 | |
| 117 | |
| 118 | /* |
| 119 | * convert a sampling rate into our full speed format (fs/1000 in Q16.16) |
| 120 | * this will overflow at approx 524 kHz |
| 121 | */ |
| 122 | static inline unsigned get_usb_full_speed_rate(unsigned rate) |
| 123 | { |
| 124 | return ((rate << 13) + 62) / 125; |
| 125 | } |
| 126 | |
| 127 | /* |
| 128 | * convert a sampling rate into USB high speed format (fs/8000 in Q16.16) |
| 129 | * this will overflow at approx 4 MHz |
| 130 | */ |
| 131 | static inline unsigned get_usb_high_speed_rate(unsigned rate) |
| 132 | { |
| 133 | return ((rate << 10) + 62) / 125; |
| 134 | } |
| 135 | |
| 136 | void usb_stream_free(struct usb_stream_kernel *sk) |
| 137 | { |
| 138 | struct usb_stream *s; |
| 139 | unsigned u; |
| 140 | |
| 141 | for (u = 0; u < USB_STREAM_NURBS; ++u) { |
| 142 | usb_free_urb(sk->inurb[u]); |
| 143 | sk->inurb[u] = NULL; |
| 144 | usb_free_urb(sk->outurb[u]); |
| 145 | sk->outurb[u] = NULL; |
| 146 | } |
| 147 | |
| 148 | s = sk->s; |
| 149 | if (!s) |
| 150 | return; |
| 151 | |
| 152 | free_pages((unsigned long)sk->write_page, get_order(s->write_size)); |
| 153 | sk->write_page = NULL; |
| 154 | free_pages((unsigned long)s, get_order(s->read_size)); |
| 155 | sk->s = NULL; |
| 156 | } |
| 157 | |
| 158 | struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk, |
| 159 | struct usb_device *dev, |
| 160 | unsigned in_endpoint, unsigned out_endpoint, |
| 161 | unsigned sample_rate, unsigned use_packsize, |
| 162 | unsigned period_frames, unsigned frame_size) |
| 163 | { |
| 164 | int packets, max_packsize; |
| 165 | int in_pipe, out_pipe; |
| 166 | int read_size = sizeof(struct usb_stream); |
| 167 | int write_size; |
| 168 | int usb_frames = dev->speed == USB_SPEED_HIGH ? 8000 : 1000; |
| 169 | int pg; |
| 170 | |
| 171 | in_pipe = usb_rcvisocpipe(dev, in_endpoint); |
| 172 | out_pipe = usb_sndisocpipe(dev, out_endpoint); |
| 173 | |
| 174 | max_packsize = use_packsize ? |
| 175 | use_packsize : usb_maxpacket(dev, in_pipe, 0); |
| 176 | |
| 177 | /* |
| 178 | t_period = period_frames / sample_rate |
| 179 | iso_packs = t_period / t_iso_frame |
| 180 | = (period_frames / sample_rate) * (1 / t_iso_frame) |
| 181 | */ |
| 182 | |
| 183 | packets = period_frames * usb_frames / sample_rate + 1; |
| 184 | |
| 185 | if (dev->speed == USB_SPEED_HIGH) |
| 186 | packets = (packets + 7) & ~7; |
| 187 | |
| 188 | read_size += packets * USB_STREAM_URBDEPTH * |
| 189 | (max_packsize + sizeof(struct usb_stream_packet)); |
| 190 | |
| 191 | max_packsize = usb_maxpacket(dev, out_pipe, 1); |
| 192 | write_size = max_packsize * packets * USB_STREAM_URBDEPTH; |
| 193 | |
| 194 | if (read_size >= 256*PAGE_SIZE || write_size >= 256*PAGE_SIZE) { |
| 195 | snd_printk(KERN_WARNING "a size exceeds 128*PAGE_SIZE\n"); |
| 196 | goto out; |
| 197 | } |
| 198 | |
| 199 | pg = get_order(read_size); |
| 200 | sk->s = (void *) __get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO, pg); |
| 201 | if (!sk->s) { |
| 202 | snd_printk(KERN_WARNING "couldn't __get_free_pages()\n"); |
| 203 | goto out; |
| 204 | } |
| 205 | sk->s->cfg.version = USB_STREAM_INTERFACE_VERSION; |
| 206 | |
| 207 | sk->s->read_size = read_size; |
| 208 | |
| 209 | sk->s->cfg.sample_rate = sample_rate; |
| 210 | sk->s->cfg.frame_size = frame_size; |
| 211 | sk->n_o_ps = packets; |
| 212 | sk->s->inpackets = packets * USB_STREAM_URBDEPTH; |
| 213 | sk->s->cfg.period_frames = period_frames; |
| 214 | sk->s->period_size = frame_size * period_frames; |
| 215 | |
| 216 | sk->s->write_size = write_size; |
| 217 | pg = get_order(write_size); |
| 218 | |
| 219 | sk->write_page = |
| 220 | (void *)__get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO, pg); |
| 221 | if (!sk->write_page) { |
| 222 | snd_printk(KERN_WARNING "couldn't __get_free_pages()\n"); |
| 223 | usb_stream_free(sk); |
| 224 | return NULL; |
| 225 | } |
| 226 | |
| 227 | /* calculate the frequency in 16.16 format */ |
| 228 | if (dev->speed == USB_SPEED_FULL) |
| 229 | sk->freqn = get_usb_full_speed_rate(sample_rate); |
| 230 | else |
| 231 | sk->freqn = get_usb_high_speed_rate(sample_rate); |
| 232 | |
| 233 | init_urbs(sk, use_packsize, dev, in_pipe, out_pipe); |
| 234 | sk->s->state = usb_stream_stopped; |
| 235 | out: |
| 236 | return sk->s; |
| 237 | } |
| 238 | |
| 239 | |
| 240 | /* start */ |
| 241 | |
| 242 | static bool balance_check(struct usb_stream_kernel *sk, struct urb *urb) |
| 243 | { |
| 244 | bool r; |
| 245 | if (unlikely(urb->status)) { |
| 246 | if (urb->status != -ESHUTDOWN && urb->status != -ENOENT) |
| 247 | snd_printk(KERN_WARNING "status=%i\n", urb->status); |
| 248 | sk->iso_frame_balance = 0x7FFFFFFF; |
| 249 | return false; |
| 250 | } |
| 251 | r = sk->iso_frame_balance == 0; |
| 252 | if (!r) |
| 253 | sk->i_urb = urb; |
| 254 | return r; |
| 255 | } |
| 256 | |
| 257 | static bool balance_playback(struct usb_stream_kernel *sk, struct urb *urb) |
| 258 | { |
| 259 | sk->iso_frame_balance += urb->number_of_packets; |
| 260 | return balance_check(sk, urb); |
| 261 | } |
| 262 | |
| 263 | static bool balance_capture(struct usb_stream_kernel *sk, struct urb *urb) |
| 264 | { |
| 265 | sk->iso_frame_balance -= urb->number_of_packets; |
| 266 | return balance_check(sk, urb); |
| 267 | } |
| 268 | |
| 269 | static void subs_set_complete(struct urb **urbs, void (*complete)(struct urb *)) |
| 270 | { |
| 271 | int u; |
| 272 | |
| 273 | for (u = 0; u < USB_STREAM_NURBS; u++) { |
| 274 | struct urb *urb = urbs[u]; |
| 275 | urb->complete = complete; |
| 276 | } |
| 277 | } |
| 278 | |
| 279 | int usb_stream_prepare_playback(struct usb_stream_kernel *sk, struct urb *inurb) |
| 280 | { |
| 281 | struct usb_stream *s = sk->s; |
| 282 | struct urb *io; |
| 283 | struct usb_iso_packet_descriptor *id, *od; |
| 284 | int p, l = 0; |
| 285 | |
| 286 | io = sk->idle_outurb; |
| 287 | od = io->iso_frame_desc; |
| 288 | io->transfer_buffer_length = 0; |
| 289 | |
| 290 | for (p = 0; s->sync_packet < 0; ++p, ++s->sync_packet) { |
| 291 | struct urb *ii = sk->completed_inurb; |
| 292 | id = ii->iso_frame_desc + |
| 293 | ii->number_of_packets + s->sync_packet; |
| 294 | l = id->actual_length; |
| 295 | |
| 296 | od[p].length = l; |
| 297 | od[p].offset = io->transfer_buffer_length; |
| 298 | io->transfer_buffer_length += l; |
| 299 | } |
| 300 | |
| 301 | for (; |
| 302 | s->sync_packet < inurb->number_of_packets && p < sk->n_o_ps; |
| 303 | ++p, ++s->sync_packet) { |
| 304 | l = inurb->iso_frame_desc[s->sync_packet].actual_length; |
| 305 | |
| 306 | if (s->idle_outsize + io->transfer_buffer_length + l > |
| 307 | s->period_size) |
| 308 | goto check_ok; |
| 309 | |
| 310 | od[p].length = l; |
| 311 | od[p].offset = io->transfer_buffer_length; |
| 312 | io->transfer_buffer_length += l; |
| 313 | } |
| 314 | |
| 315 | check_ok: |
| 316 | s->sync_packet -= inurb->number_of_packets; |
| 317 | if (s->sync_packet < -2 || s->sync_packet > 0) { |
| 318 | snd_printk(KERN_WARNING "invalid sync_packet = %i;" |
| 319 | " p=%i nop=%i %i %x %x %x > %x\n", |
| 320 | s->sync_packet, p, inurb->number_of_packets, |
| 321 | s->idle_outsize + io->transfer_buffer_length + l, |
| 322 | s->idle_outsize, io->transfer_buffer_length, l, |
| 323 | s->period_size); |
| 324 | return -1; |
| 325 | } |
| 326 | if (io->transfer_buffer_length % s->cfg.frame_size) { |
| 327 | snd_printk(KERN_WARNING"invalid outsize = %i\n", |
| 328 | io->transfer_buffer_length); |
| 329 | return -1; |
| 330 | } |
| 331 | s->idle_outsize += io->transfer_buffer_length - s->period_size; |
| 332 | io->number_of_packets = p; |
| 333 | if (s->idle_outsize > 0) { |
| 334 | snd_printk(KERN_WARNING "idle=%i\n", s->idle_outsize); |
| 335 | return -1; |
| 336 | } |
| 337 | return 0; |
| 338 | } |
| 339 | |
| 340 | static void prepare_inurb(int number_of_packets, struct urb *iu) |
| 341 | { |
| 342 | struct usb_iso_packet_descriptor *id; |
| 343 | int p; |
| 344 | |
| 345 | iu->number_of_packets = number_of_packets; |
| 346 | id = iu->iso_frame_desc; |
| 347 | id->offset = 0; |
| 348 | for (p = 0; p < iu->number_of_packets - 1; ++p) |
| 349 | id[p + 1].offset = id[p].offset + id[p].length; |
| 350 | |
| 351 | iu->transfer_buffer_length = |
| 352 | id[0].length * iu->number_of_packets; |
| 353 | } |
| 354 | |
| 355 | static int submit_urbs(struct usb_stream_kernel *sk, |
| 356 | struct urb *inurb, struct urb *outurb) |
| 357 | { |
| 358 | int err; |
| 359 | prepare_inurb(sk->idle_outurb->number_of_packets, sk->idle_inurb); |
| 360 | err = usb_submit_urb(sk->idle_inurb, GFP_ATOMIC); |
| 361 | if (err < 0) { |
| 362 | snd_printk(KERN_ERR "%i\n", err); |
| 363 | return err; |
| 364 | } |
| 365 | sk->idle_inurb = sk->completed_inurb; |
| 366 | sk->completed_inurb = inurb; |
| 367 | err = usb_submit_urb(sk->idle_outurb, GFP_ATOMIC); |
| 368 | if (err < 0) { |
| 369 | snd_printk(KERN_ERR "%i\n", err); |
| 370 | return err; |
| 371 | } |
| 372 | sk->idle_outurb = sk->completed_outurb; |
| 373 | sk->completed_outurb = outurb; |
| 374 | return 0; |
| 375 | } |
| 376 | |
| 377 | #ifdef DEBUG_LOOP_BACK |
| 378 | /* |
| 379 | This loop_back() shows how to read/write the period data. |
| 380 | */ |
| 381 | static void loop_back(struct usb_stream *s) |
| 382 | { |
| 383 | char *i, *o; |
| 384 | int il, ol, l, p; |
| 385 | struct urb *iu; |
| 386 | struct usb_iso_packet_descriptor *id; |
| 387 | |
| 388 | o = s->playback1st_to; |
| 389 | ol = s->playback1st_size; |
| 390 | l = 0; |
| 391 | |
| 392 | if (s->insplit_pack >= 0) { |
| 393 | iu = sk->idle_inurb; |
| 394 | id = iu->iso_frame_desc; |
| 395 | p = s->insplit_pack; |
| 396 | } else |
| 397 | goto second; |
| 398 | loop: |
| 399 | for (; p < iu->number_of_packets && l < s->period_size; ++p) { |
| 400 | i = iu->transfer_buffer + id[p].offset; |
| 401 | il = id[p].actual_length; |
| 402 | if (l + il > s->period_size) |
| 403 | il = s->period_size - l; |
| 404 | if (il <= ol) { |
| 405 | memcpy(o, i, il); |
| 406 | o += il; |
| 407 | ol -= il; |
| 408 | } else { |
| 409 | memcpy(o, i, ol); |
| 410 | singen_6pack(o, ol); |
| 411 | o = s->playback_to; |
| 412 | memcpy(o, i + ol, il - ol); |
| 413 | o += il - ol; |
| 414 | ol = s->period_size - s->playback1st_size; |
| 415 | } |
| 416 | l += il; |
| 417 | } |
| 418 | if (iu == sk->completed_inurb) { |
| 419 | if (l != s->period_size) |
| 420 | printk(KERN_DEBUG"%s:%i %i\n", __func__, __LINE__, |
| 421 | l/(int)s->cfg.frame_size); |
| 422 | |
| 423 | return; |
| 424 | } |
| 425 | second: |
| 426 | iu = sk->completed_inurb; |
| 427 | id = iu->iso_frame_desc; |
| 428 | p = 0; |
| 429 | goto loop; |
| 430 | |
| 431 | } |
| 432 | #else |
| 433 | static void loop_back(struct usb_stream *s) |
| 434 | { |
| 435 | } |
| 436 | #endif |
| 437 | |
| 438 | static void stream_idle(struct usb_stream_kernel *sk, |
| 439 | struct urb *inurb, struct urb *outurb) |
| 440 | { |
| 441 | struct usb_stream *s = sk->s; |
| 442 | int l, p; |
| 443 | int insize = s->idle_insize; |
| 444 | int urb_size = 0; |
| 445 | |
| 446 | s->inpacket_split = s->next_inpacket_split; |
| 447 | s->inpacket_split_at = s->next_inpacket_split_at; |
| 448 | s->next_inpacket_split = -1; |
| 449 | s->next_inpacket_split_at = 0; |
| 450 | |
| 451 | for (p = 0; p < inurb->number_of_packets; ++p) { |
| 452 | struct usb_iso_packet_descriptor *id = inurb->iso_frame_desc; |
| 453 | l = id[p].actual_length; |
| 454 | if (unlikely(l == 0 || id[p].status)) { |
| 455 | snd_printk(KERN_WARNING "underrun, status=%u\n", |
| 456 | id[p].status); |
| 457 | goto err_out; |
| 458 | } |
| 459 | s->inpacket_head++; |
| 460 | s->inpacket_head %= s->inpackets; |
| 461 | if (s->inpacket_split == -1) |
| 462 | s->inpacket_split = s->inpacket_head; |
| 463 | |
| 464 | s->inpacket[s->inpacket_head].offset = |
| 465 | id[p].offset + (inurb->transfer_buffer - (void *)s); |
| 466 | s->inpacket[s->inpacket_head].length = l; |
| 467 | if (insize + l > s->period_size && |
| 468 | s->next_inpacket_split == -1) { |
| 469 | s->next_inpacket_split = s->inpacket_head; |
| 470 | s->next_inpacket_split_at = s->period_size - insize; |
| 471 | } |
| 472 | insize += l; |
| 473 | urb_size += l; |
| 474 | } |
| 475 | s->idle_insize += urb_size - s->period_size; |
| 476 | if (s->idle_insize < 0) { |
| 477 | snd_printk(KERN_WARNING "%i\n", |
| 478 | (s->idle_insize)/(int)s->cfg.frame_size); |
| 479 | goto err_out; |
| 480 | } |
| 481 | s->insize_done += urb_size; |
| 482 | |
| 483 | l = s->idle_outsize; |
| 484 | s->outpacket[0].offset = (sk->idle_outurb->transfer_buffer - |
| 485 | sk->write_page) - l; |
| 486 | |
| 487 | if (usb_stream_prepare_playback(sk, inurb) < 0) |
| 488 | goto err_out; |
| 489 | |
| 490 | s->outpacket[0].length = sk->idle_outurb->transfer_buffer_length + l; |
| 491 | s->outpacket[1].offset = sk->completed_outurb->transfer_buffer - |
| 492 | sk->write_page; |
| 493 | |
| 494 | if (submit_urbs(sk, inurb, outurb) < 0) |
| 495 | goto err_out; |
| 496 | |
| 497 | loop_back(s); |
| 498 | s->periods_done++; |
| 499 | wake_up_all(&sk->sleep); |
| 500 | return; |
| 501 | err_out: |
| 502 | s->state = usb_stream_xrun; |
| 503 | wake_up_all(&sk->sleep); |
| 504 | } |
| 505 | |
| 506 | static void i_capture_idle(struct urb *urb) |
| 507 | { |
| 508 | struct usb_stream_kernel *sk = urb->context; |
| 509 | if (balance_capture(sk, urb)) |
| 510 | stream_idle(sk, urb, sk->i_urb); |
| 511 | } |
| 512 | |
| 513 | static void i_playback_idle(struct urb *urb) |
| 514 | { |
| 515 | struct usb_stream_kernel *sk = urb->context; |
| 516 | if (balance_playback(sk, urb)) |
| 517 | stream_idle(sk, sk->i_urb, urb); |
| 518 | } |
| 519 | |
| 520 | static void stream_start(struct usb_stream_kernel *sk, |
| 521 | struct urb *inurb, struct urb *outurb) |
| 522 | { |
| 523 | struct usb_stream *s = sk->s; |
| 524 | if (s->state >= usb_stream_sync1) { |
| 525 | int l, p, max_diff, max_diff_0; |
| 526 | int urb_size = 0; |
| 527 | unsigned frames_per_packet, min_frames = 0; |
| 528 | frames_per_packet = (s->period_size - s->idle_insize); |
| 529 | frames_per_packet <<= 8; |
| 530 | frames_per_packet /= |
| 531 | s->cfg.frame_size * inurb->number_of_packets; |
| 532 | frames_per_packet++; |
| 533 | |
| 534 | max_diff_0 = s->cfg.frame_size; |
| 535 | if (s->cfg.period_frames >= 256) |
| 536 | max_diff_0 <<= 1; |
| 537 | if (s->cfg.period_frames >= 1024) |
| 538 | max_diff_0 <<= 1; |
| 539 | max_diff = max_diff_0; |
| 540 | for (p = 0; p < inurb->number_of_packets; ++p) { |
| 541 | int diff; |
| 542 | l = inurb->iso_frame_desc[p].actual_length; |
| 543 | urb_size += l; |
| 544 | |
| 545 | min_frames += frames_per_packet; |
| 546 | diff = urb_size - |
| 547 | (min_frames >> 8) * s->cfg.frame_size; |
| 548 | if (diff < max_diff) { |
| 549 | snd_printdd(KERN_DEBUG "%i %i %i %i\n", |
| 550 | s->insize_done, |
| 551 | urb_size / (int)s->cfg.frame_size, |
| 552 | inurb->number_of_packets, diff); |
| 553 | max_diff = diff; |
| 554 | } |
| 555 | } |
| 556 | s->idle_insize -= max_diff - max_diff_0; |
| 557 | s->idle_insize += urb_size - s->period_size; |
| 558 | if (s->idle_insize < 0) { |
| 559 | snd_printk("%i %i %i\n", |
| 560 | s->idle_insize, urb_size, s->period_size); |
| 561 | return; |
| 562 | } else if (s->idle_insize == 0) { |
| 563 | s->next_inpacket_split = |
| 564 | (s->inpacket_head + 1) % s->inpackets; |
| 565 | s->next_inpacket_split_at = 0; |
| 566 | } else { |
| 567 | unsigned split = s->inpacket_head; |
| 568 | l = s->idle_insize; |
| 569 | while (l > s->inpacket[split].length) { |
| 570 | l -= s->inpacket[split].length; |
| 571 | if (split == 0) |
| 572 | split = s->inpackets - 1; |
| 573 | else |
| 574 | split--; |
| 575 | } |
| 576 | s->next_inpacket_split = split; |
| 577 | s->next_inpacket_split_at = |
| 578 | s->inpacket[split].length - l; |
| 579 | } |
| 580 | |
| 581 | s->insize_done += urb_size; |
| 582 | |
| 583 | if (usb_stream_prepare_playback(sk, inurb) < 0) |
| 584 | return; |
| 585 | |
| 586 | } else |
| 587 | playback_prep_freqn(sk, sk->idle_outurb); |
| 588 | |
| 589 | if (submit_urbs(sk, inurb, outurb) < 0) |
| 590 | return; |
| 591 | |
| 592 | if (s->state == usb_stream_sync1 && s->insize_done > 360000) { |
| 593 | /* just guesswork ^^^^^^ */ |
| 594 | s->state = usb_stream_ready; |
| 595 | subs_set_complete(sk->inurb, i_capture_idle); |
| 596 | subs_set_complete(sk->outurb, i_playback_idle); |
| 597 | } |
| 598 | } |
| 599 | |
| 600 | static void i_capture_start(struct urb *urb) |
| 601 | { |
| 602 | struct usb_iso_packet_descriptor *id = urb->iso_frame_desc; |
| 603 | struct usb_stream_kernel *sk = urb->context; |
| 604 | struct usb_stream *s = sk->s; |
| 605 | int p; |
| 606 | int empty = 0; |
| 607 | |
| 608 | if (urb->status) { |
| 609 | snd_printk(KERN_WARNING "status=%i\n", urb->status); |
| 610 | return; |
| 611 | } |
| 612 | |
| 613 | for (p = 0; p < urb->number_of_packets; ++p) { |
| 614 | int l = id[p].actual_length; |
| 615 | if (l < s->cfg.frame_size) { |
| 616 | ++empty; |
| 617 | if (s->state >= usb_stream_sync0) { |
| 618 | snd_printk(KERN_WARNING "%i\n", l); |
| 619 | return; |
| 620 | } |
| 621 | } |
| 622 | s->inpacket_head++; |
| 623 | s->inpacket_head %= s->inpackets; |
| 624 | s->inpacket[s->inpacket_head].offset = |
| 625 | id[p].offset + (urb->transfer_buffer - (void *)s); |
| 626 | s->inpacket[s->inpacket_head].length = l; |
| 627 | } |
| 628 | #ifdef SHOW_EMPTY |
| 629 | if (empty) { |
| 630 | printk(KERN_DEBUG"%s:%i: %i", __func__, __LINE__, |
| 631 | urb->iso_frame_desc[0].actual_length); |
| 632 | for (pack = 1; pack < urb->number_of_packets; ++pack) { |
| 633 | int l = urb->iso_frame_desc[pack].actual_length; |
| 634 | printk(" %i", l); |
| 635 | } |
| 636 | printk("\n"); |
| 637 | } |
| 638 | #endif |
| 639 | if (!empty && s->state < usb_stream_sync1) |
| 640 | ++s->state; |
| 641 | |
| 642 | if (balance_capture(sk, urb)) |
| 643 | stream_start(sk, urb, sk->i_urb); |
| 644 | } |
| 645 | |
| 646 | static void i_playback_start(struct urb *urb) |
| 647 | { |
| 648 | struct usb_stream_kernel *sk = urb->context; |
| 649 | if (balance_playback(sk, urb)) |
| 650 | stream_start(sk, sk->i_urb, urb); |
| 651 | } |
| 652 | |
| 653 | int usb_stream_start(struct usb_stream_kernel *sk) |
| 654 | { |
| 655 | struct usb_stream *s = sk->s; |
| 656 | int frame = 0, iters = 0; |
| 657 | int u, err; |
| 658 | int try = 0; |
| 659 | |
| 660 | if (s->state != usb_stream_stopped) |
| 661 | return -EAGAIN; |
| 662 | |
| 663 | subs_set_complete(sk->inurb, i_capture_start); |
| 664 | subs_set_complete(sk->outurb, i_playback_start); |
| 665 | memset(sk->write_page, 0, s->write_size); |
| 666 | dotry: |
| 667 | s->insize_done = 0; |
| 668 | s->idle_insize = 0; |
| 669 | s->idle_outsize = 0; |
| 670 | s->sync_packet = -1; |
| 671 | s->inpacket_head = -1; |
| 672 | sk->iso_frame_balance = 0; |
| 673 | ++try; |
| 674 | for (u = 0; u < 2; u++) { |
| 675 | struct urb *inurb = sk->inurb[u]; |
| 676 | struct urb *outurb = sk->outurb[u]; |
| 677 | playback_prep_freqn(sk, outurb); |
| 678 | inurb->number_of_packets = outurb->number_of_packets; |
| 679 | inurb->transfer_buffer_length = |
| 680 | inurb->number_of_packets * |
| 681 | inurb->iso_frame_desc[0].length; |
| 682 | preempt_disable(); |
| 683 | if (u == 0) { |
| 684 | int now; |
| 685 | struct usb_device *dev = inurb->dev; |
| 686 | frame = usb_get_current_frame_number(dev); |
| 687 | do { |
| 688 | now = usb_get_current_frame_number(dev); |
| 689 | ++iters; |
| 690 | } while (now > -1 && now == frame); |
| 691 | } |
| 692 | err = usb_submit_urb(inurb, GFP_ATOMIC); |
| 693 | if (err < 0) { |
| 694 | preempt_enable(); |
| 695 | snd_printk(KERN_ERR"usb_submit_urb(sk->inurb[%i])" |
| 696 | " returned %i\n", u, err); |
| 697 | return err; |
| 698 | } |
| 699 | err = usb_submit_urb(outurb, GFP_ATOMIC); |
| 700 | if (err < 0) { |
| 701 | preempt_enable(); |
| 702 | snd_printk(KERN_ERR"usb_submit_urb(sk->outurb[%i])" |
| 703 | " returned %i\n", u, err); |
| 704 | return err; |
| 705 | } |
| 706 | preempt_enable(); |
| 707 | if (inurb->start_frame != outurb->start_frame) { |
| 708 | snd_printd(KERN_DEBUG |
| 709 | "u[%i] start_frames differ in:%u out:%u\n", |
| 710 | u, inurb->start_frame, outurb->start_frame); |
| 711 | goto check_retry; |
| 712 | } |
| 713 | } |
| 714 | snd_printdd(KERN_DEBUG "%i %i\n", frame, iters); |
| 715 | try = 0; |
| 716 | check_retry: |
| 717 | if (try) { |
| 718 | usb_stream_stop(sk); |
| 719 | if (try < 5) { |
| 720 | msleep(1500); |
| 721 | snd_printd(KERN_DEBUG "goto dotry;\n"); |
| 722 | goto dotry; |
| 723 | } |
| 724 | snd_printk(KERN_WARNING"couldn't start" |
| 725 | " all urbs on the same start_frame.\n"); |
| 726 | return -EFAULT; |
| 727 | } |
| 728 | |
| 729 | sk->idle_inurb = sk->inurb[USB_STREAM_NURBS - 2]; |
| 730 | sk->idle_outurb = sk->outurb[USB_STREAM_NURBS - 2]; |
| 731 | sk->completed_inurb = sk->inurb[USB_STREAM_NURBS - 1]; |
| 732 | sk->completed_outurb = sk->outurb[USB_STREAM_NURBS - 1]; |
| 733 | |
| 734 | /* wait, check */ |
| 735 | { |
| 736 | int wait_ms = 3000; |
| 737 | while (s->state != usb_stream_ready && wait_ms > 0) { |
| 738 | snd_printdd(KERN_DEBUG "%i\n", s->state); |
| 739 | msleep(200); |
| 740 | wait_ms -= 200; |
| 741 | } |
| 742 | } |
| 743 | |
| 744 | return s->state == usb_stream_ready ? 0 : -EFAULT; |
| 745 | } |
| 746 | |
| 747 | |
| 748 | /* stop */ |
| 749 | |
| 750 | void usb_stream_stop(struct usb_stream_kernel *sk) |
| 751 | { |
| 752 | int u; |
| 753 | if (!sk->s) |
| 754 | return; |
| 755 | for (u = 0; u < USB_STREAM_NURBS; ++u) { |
| 756 | usb_kill_urb(sk->inurb[u]); |
| 757 | usb_kill_urb(sk->outurb[u]); |
| 758 | } |
| 759 | sk->s->state = usb_stream_stopped; |
| 760 | msleep(400); |
| 761 | } |