1 /* 2 * QEMU Audio subsystem 3 * 4 * Copyright (c) 2003-2005 Vassili Karpov (malc) 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include "audio.h" 27 #include "migration/vmstate.h" 28 #include "monitor/monitor.h" 29 #include "qemu/timer.h" 30 #include "qapi/error.h" 31 #include "qapi/qobject-input-visitor.h" 32 #include "qapi/qapi-visit-audio.h" 33 #include "qemu/cutils.h" 34 #include "qemu/module.h" 35 #include "sysemu/sysemu.h" 36 #include "sysemu/replay.h" 37 #include "sysemu/runstate.h" 38 #include "ui/qemu-spice.h" 39 #include "trace.h" 40 41 #define AUDIO_CAP "audio" 42 #include "audio_int.h" 43 44 /* #define DEBUG_LIVE */ 45 /* #define DEBUG_OUT */ 46 /* #define DEBUG_CAPTURE */ 47 /* #define DEBUG_POLL */ 48 49 #define SW_NAME(sw) (sw)->name ? (sw)->name : "unknown" 50 51 52 /* Order of CONFIG_AUDIO_DRIVERS is import. 53 The 1st one is the one used by default, that is the reason 54 that we generate the list. 55 */ 56 const char *audio_prio_list[] = { 57 "spice", 58 CONFIG_AUDIO_DRIVERS 59 "none", 60 "wav", 61 NULL 62 }; 63 64 static QLIST_HEAD(, audio_driver) audio_drivers; 65 static AudiodevListHead audiodevs = QSIMPLEQ_HEAD_INITIALIZER(audiodevs); 66 67 void audio_driver_register(audio_driver *drv) 68 { 69 QLIST_INSERT_HEAD(&audio_drivers, drv, next); 70 } 71 72 audio_driver *audio_driver_lookup(const char *name) 73 { 74 struct audio_driver *d; 75 76 QLIST_FOREACH(d, &audio_drivers, next) { 77 if (strcmp(name, d->name) == 0) { 78 return d; 79 } 80 } 81 82 audio_module_load_one(name); 83 QLIST_FOREACH(d, &audio_drivers, next) { 84 if (strcmp(name, d->name) == 0) { 85 return d; 86 } 87 } 88 89 return NULL; 90 } 91 92 static QTAILQ_HEAD(AudioStateHead, AudioState) audio_states = 93 QTAILQ_HEAD_INITIALIZER(audio_states); 94 95 const struct mixeng_volume nominal_volume = { 96 .mute = 0, 97 #ifdef FLOAT_MIXENG 98 .r = 1.0, 99 .l = 1.0, 100 #else 101 .r = 1ULL << 32, 102 .l = 1ULL << 32, 103 #endif 104 }; 105 106 static bool legacy_config = true; 107 108 int audio_bug (const char *funcname, int cond) 109 { 110 if (cond) { 111 static int shown; 112 113 AUD_log (NULL, "A bug was just triggered in %s\n", funcname); 114 if (!shown) { 115 shown = 1; 116 AUD_log (NULL, "Save all your work and restart without audio\n"); 117 AUD_log (NULL, "I am sorry\n"); 118 } 119 AUD_log (NULL, "Context:\n"); 120 } 121 122 return cond; 123 } 124 125 static inline int audio_bits_to_index (int bits) 126 { 127 switch (bits) { 128 case 8: 129 return 0; 130 131 case 16: 132 return 1; 133 134 case 32: 135 return 2; 136 137 default: 138 audio_bug ("bits_to_index", 1); 139 AUD_log (NULL, "invalid bits %d\n", bits); 140 abort(); 141 } 142 } 143 144 void *audio_calloc (const char *funcname, int nmemb, size_t size) 145 { 146 int cond; 147 size_t len; 148 149 len = nmemb * size; 150 cond = !nmemb || !size; 151 cond |= nmemb < 0; 152 cond |= len < size; 153 154 if (audio_bug ("audio_calloc", cond)) { 155 AUD_log (NULL, "%s passed invalid arguments to audio_calloc\n", 156 funcname); 157 AUD_log (NULL, "nmemb=%d size=%zu (len=%zu)\n", nmemb, size, len); 158 abort(); 159 } 160 161 return g_malloc0 (len); 162 } 163 164 void AUD_vlog (const char *cap, const char *fmt, va_list ap) 165 { 166 if (cap) { 167 fprintf(stderr, "%s: ", cap); 168 } 169 170 vfprintf(stderr, fmt, ap); 171 } 172 173 void AUD_log (const char *cap, const char *fmt, ...) 174 { 175 va_list ap; 176 177 va_start (ap, fmt); 178 AUD_vlog (cap, fmt, ap); 179 va_end (ap); 180 } 181 182 static void audio_print_settings (struct audsettings *as) 183 { 184 dolog ("frequency=%d nchannels=%d fmt=", as->freq, as->nchannels); 185 186 switch (as->fmt) { 187 case AUDIO_FORMAT_S8: 188 AUD_log (NULL, "S8"); 189 break; 190 case AUDIO_FORMAT_U8: 191 AUD_log (NULL, "U8"); 192 break; 193 case AUDIO_FORMAT_S16: 194 AUD_log (NULL, "S16"); 195 break; 196 case AUDIO_FORMAT_U16: 197 AUD_log (NULL, "U16"); 198 break; 199 case AUDIO_FORMAT_S32: 200 AUD_log (NULL, "S32"); 201 break; 202 case AUDIO_FORMAT_U32: 203 AUD_log (NULL, "U32"); 204 break; 205 case AUDIO_FORMAT_F32: 206 AUD_log (NULL, "F32"); 207 break; 208 default: 209 AUD_log (NULL, "invalid(%d)", as->fmt); 210 break; 211 } 212 213 AUD_log (NULL, " endianness="); 214 switch (as->endianness) { 215 case 0: 216 AUD_log (NULL, "little"); 217 break; 218 case 1: 219 AUD_log (NULL, "big"); 220 break; 221 default: 222 AUD_log (NULL, "invalid"); 223 break; 224 } 225 AUD_log (NULL, "\n"); 226 } 227 228 static int audio_validate_settings (struct audsettings *as) 229 { 230 int invalid; 231 232 invalid = as->nchannels < 1; 233 invalid |= as->endianness != 0 && as->endianness != 1; 234 235 switch (as->fmt) { 236 case AUDIO_FORMAT_S8: 237 case AUDIO_FORMAT_U8: 238 case AUDIO_FORMAT_S16: 239 case AUDIO_FORMAT_U16: 240 case AUDIO_FORMAT_S32: 241 case AUDIO_FORMAT_U32: 242 case AUDIO_FORMAT_F32: 243 break; 244 default: 245 invalid = 1; 246 break; 247 } 248 249 invalid |= as->freq <= 0; 250 return invalid ? -1 : 0; 251 } 252 253 static int audio_pcm_info_eq (struct audio_pcm_info *info, struct audsettings *as) 254 { 255 int bits = 8; 256 bool is_signed = false, is_float = false; 257 258 switch (as->fmt) { 259 case AUDIO_FORMAT_S8: 260 is_signed = true; 261 /* fall through */ 262 case AUDIO_FORMAT_U8: 263 break; 264 265 case AUDIO_FORMAT_S16: 266 is_signed = true; 267 /* fall through */ 268 case AUDIO_FORMAT_U16: 269 bits = 16; 270 break; 271 272 case AUDIO_FORMAT_F32: 273 is_float = true; 274 /* fall through */ 275 case AUDIO_FORMAT_S32: 276 is_signed = true; 277 /* fall through */ 278 case AUDIO_FORMAT_U32: 279 bits = 32; 280 break; 281 282 default: 283 abort(); 284 } 285 return info->freq == as->freq 286 && info->nchannels == as->nchannels 287 && info->is_signed == is_signed 288 && info->is_float == is_float 289 && info->bits == bits 290 && info->swap_endianness == (as->endianness != AUDIO_HOST_ENDIANNESS); 291 } 292 293 void audio_pcm_init_info (struct audio_pcm_info *info, struct audsettings *as) 294 { 295 int bits = 8, mul; 296 bool is_signed = false, is_float = false; 297 298 switch (as->fmt) { 299 case AUDIO_FORMAT_S8: 300 is_signed = true; 301 /* fall through */ 302 case AUDIO_FORMAT_U8: 303 mul = 1; 304 break; 305 306 case AUDIO_FORMAT_S16: 307 is_signed = true; 308 /* fall through */ 309 case AUDIO_FORMAT_U16: 310 bits = 16; 311 mul = 2; 312 break; 313 314 case AUDIO_FORMAT_F32: 315 is_float = true; 316 /* fall through */ 317 case AUDIO_FORMAT_S32: 318 is_signed = true; 319 /* fall through */ 320 case AUDIO_FORMAT_U32: 321 bits = 32; 322 mul = 4; 323 break; 324 325 default: 326 abort(); 327 } 328 329 info->freq = as->freq; 330 info->bits = bits; 331 info->is_signed = is_signed; 332 info->is_float = is_float; 333 info->nchannels = as->nchannels; 334 info->bytes_per_frame = as->nchannels * mul; 335 info->bytes_per_second = info->freq * info->bytes_per_frame; 336 info->swap_endianness = (as->endianness != AUDIO_HOST_ENDIANNESS); 337 } 338 339 void audio_pcm_info_clear_buf (struct audio_pcm_info *info, void *buf, int len) 340 { 341 if (!len) { 342 return; 343 } 344 345 if (info->is_signed || info->is_float) { 346 memset(buf, 0x00, len * info->bytes_per_frame); 347 } else { 348 switch (info->bits) { 349 case 8: 350 memset(buf, 0x80, len * info->bytes_per_frame); 351 break; 352 353 case 16: 354 { 355 int i; 356 uint16_t *p = buf; 357 short s = INT16_MAX; 358 359 if (info->swap_endianness) { 360 s = bswap16 (s); 361 } 362 363 for (i = 0; i < len * info->nchannels; i++) { 364 p[i] = s; 365 } 366 } 367 break; 368 369 case 32: 370 { 371 int i; 372 uint32_t *p = buf; 373 int32_t s = INT32_MAX; 374 375 if (info->swap_endianness) { 376 s = bswap32 (s); 377 } 378 379 for (i = 0; i < len * info->nchannels; i++) { 380 p[i] = s; 381 } 382 } 383 break; 384 385 default: 386 AUD_log (NULL, "audio_pcm_info_clear_buf: invalid bits %d\n", 387 info->bits); 388 break; 389 } 390 } 391 } 392 393 /* 394 * Capture 395 */ 396 static void noop_conv (struct st_sample *dst, const void *src, int samples) 397 { 398 (void) src; 399 (void) dst; 400 (void) samples; 401 } 402 403 static CaptureVoiceOut *audio_pcm_capture_find_specific(AudioState *s, 404 struct audsettings *as) 405 { 406 CaptureVoiceOut *cap; 407 408 for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) { 409 if (audio_pcm_info_eq (&cap->hw.info, as)) { 410 return cap; 411 } 412 } 413 return NULL; 414 } 415 416 static void audio_notify_capture (CaptureVoiceOut *cap, audcnotification_e cmd) 417 { 418 struct capture_callback *cb; 419 420 #ifdef DEBUG_CAPTURE 421 dolog ("notification %d sent\n", cmd); 422 #endif 423 for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) { 424 cb->ops.notify (cb->opaque, cmd); 425 } 426 } 427 428 static void audio_capture_maybe_changed (CaptureVoiceOut *cap, int enabled) 429 { 430 if (cap->hw.enabled != enabled) { 431 audcnotification_e cmd; 432 cap->hw.enabled = enabled; 433 cmd = enabled ? AUD_CNOTIFY_ENABLE : AUD_CNOTIFY_DISABLE; 434 audio_notify_capture (cap, cmd); 435 } 436 } 437 438 static void audio_recalc_and_notify_capture (CaptureVoiceOut *cap) 439 { 440 HWVoiceOut *hw = &cap->hw; 441 SWVoiceOut *sw; 442 int enabled = 0; 443 444 for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) { 445 if (sw->active) { 446 enabled = 1; 447 break; 448 } 449 } 450 audio_capture_maybe_changed (cap, enabled); 451 } 452 453 static void audio_detach_capture (HWVoiceOut *hw) 454 { 455 SWVoiceCap *sc = hw->cap_head.lh_first; 456 457 while (sc) { 458 SWVoiceCap *sc1 = sc->entries.le_next; 459 SWVoiceOut *sw = &sc->sw; 460 CaptureVoiceOut *cap = sc->cap; 461 int was_active = sw->active; 462 463 if (sw->rate) { 464 st_rate_stop (sw->rate); 465 sw->rate = NULL; 466 } 467 468 QLIST_REMOVE (sw, entries); 469 QLIST_REMOVE (sc, entries); 470 g_free (sc); 471 if (was_active) { 472 /* We have removed soft voice from the capture: 473 this might have changed the overall status of the capture 474 since this might have been the only active voice */ 475 audio_recalc_and_notify_capture (cap); 476 } 477 sc = sc1; 478 } 479 } 480 481 static int audio_attach_capture (HWVoiceOut *hw) 482 { 483 AudioState *s = hw->s; 484 CaptureVoiceOut *cap; 485 486 audio_detach_capture (hw); 487 for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) { 488 SWVoiceCap *sc; 489 SWVoiceOut *sw; 490 HWVoiceOut *hw_cap = &cap->hw; 491 492 sc = g_malloc0(sizeof(*sc)); 493 494 sc->cap = cap; 495 sw = &sc->sw; 496 sw->hw = hw_cap; 497 sw->info = hw->info; 498 sw->empty = 1; 499 sw->active = hw->enabled; 500 sw->conv = noop_conv; 501 sw->ratio = ((int64_t) hw_cap->info.freq << 32) / sw->info.freq; 502 sw->vol = nominal_volume; 503 sw->rate = st_rate_start (sw->info.freq, hw_cap->info.freq); 504 if (!sw->rate) { 505 dolog ("Could not start rate conversion for `%s'\n", SW_NAME (sw)); 506 g_free (sw); 507 return -1; 508 } 509 QLIST_INSERT_HEAD (&hw_cap->sw_head, sw, entries); 510 QLIST_INSERT_HEAD (&hw->cap_head, sc, entries); 511 #ifdef DEBUG_CAPTURE 512 sw->name = g_strdup_printf ("for %p %d,%d,%d", 513 hw, sw->info.freq, sw->info.bits, 514 sw->info.nchannels); 515 dolog ("Added %s active = %d\n", sw->name, sw->active); 516 #endif 517 if (sw->active) { 518 audio_capture_maybe_changed (cap, 1); 519 } 520 } 521 return 0; 522 } 523 524 /* 525 * Hard voice (capture) 526 */ 527 static size_t audio_pcm_hw_find_min_in (HWVoiceIn *hw) 528 { 529 SWVoiceIn *sw; 530 size_t m = hw->total_samples_captured; 531 532 for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) { 533 if (sw->active) { 534 m = MIN (m, sw->total_hw_samples_acquired); 535 } 536 } 537 return m; 538 } 539 540 static size_t audio_pcm_hw_get_live_in(HWVoiceIn *hw) 541 { 542 size_t live = hw->total_samples_captured - audio_pcm_hw_find_min_in (hw); 543 if (audio_bug(__func__, live > hw->conv_buf->size)) { 544 dolog("live=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size); 545 abort(); 546 } 547 return live; 548 } 549 550 static size_t audio_pcm_hw_conv_in(HWVoiceIn *hw, void *pcm_buf, size_t samples) 551 { 552 size_t conv = 0; 553 STSampleBuffer *conv_buf = hw->conv_buf; 554 555 while (samples) { 556 uint8_t *src = advance(pcm_buf, conv * hw->info.bytes_per_frame); 557 size_t proc = MIN(samples, conv_buf->size - conv_buf->pos); 558 559 hw->conv(conv_buf->samples + conv_buf->pos, src, proc); 560 conv_buf->pos = (conv_buf->pos + proc) % conv_buf->size; 561 samples -= proc; 562 conv += proc; 563 } 564 565 return conv; 566 } 567 568 /* 569 * Soft voice (capture) 570 */ 571 static size_t audio_pcm_sw_read(SWVoiceIn *sw, void *buf, size_t size) 572 { 573 HWVoiceIn *hw = sw->hw; 574 size_t samples, live, ret = 0, swlim, isamp, osamp, rpos, total = 0; 575 struct st_sample *src, *dst = sw->buf; 576 577 live = hw->total_samples_captured - sw->total_hw_samples_acquired; 578 if (!live) { 579 return 0; 580 } 581 if (audio_bug(__func__, live > hw->conv_buf->size)) { 582 dolog("live_in=%zu hw->conv_buf->size=%zu\n", live, hw->conv_buf->size); 583 abort(); 584 } 585 586 rpos = audio_ring_posb(hw->conv_buf->pos, live, hw->conv_buf->size); 587 588 samples = size / sw->info.bytes_per_frame; 589 590 swlim = (live * sw->ratio) >> 32; 591 swlim = MIN (swlim, samples); 592 593 while (swlim) { 594 src = hw->conv_buf->samples + rpos; 595 if (hw->conv_buf->pos > rpos) { 596 isamp = hw->conv_buf->pos - rpos; 597 } else { 598 isamp = hw->conv_buf->size - rpos; 599 } 600 601 if (!isamp) { 602 break; 603 } 604 osamp = swlim; 605 606 st_rate_flow (sw->rate, src, dst, &isamp, &osamp); 607 swlim -= osamp; 608 rpos = (rpos + isamp) % hw->conv_buf->size; 609 dst += osamp; 610 ret += osamp; 611 total += isamp; 612 } 613 614 if (!hw->pcm_ops->volume_in) { 615 mixeng_volume (sw->buf, ret, &sw->vol); 616 } 617 618 sw->clip (buf, sw->buf, ret); 619 sw->total_hw_samples_acquired += total; 620 return ret * sw->info.bytes_per_frame; 621 } 622 623 /* 624 * Hard voice (playback) 625 */ 626 static size_t audio_pcm_hw_find_min_out (HWVoiceOut *hw, int *nb_livep) 627 { 628 SWVoiceOut *sw; 629 size_t m = SIZE_MAX; 630 int nb_live = 0; 631 632 for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) { 633 if (sw->active || !sw->empty) { 634 m = MIN (m, sw->total_hw_samples_mixed); 635 nb_live += 1; 636 } 637 } 638 639 *nb_livep = nb_live; 640 return m; 641 } 642 643 static size_t audio_pcm_hw_get_live_out (HWVoiceOut *hw, int *nb_live) 644 { 645 size_t smin; 646 int nb_live1; 647 648 smin = audio_pcm_hw_find_min_out (hw, &nb_live1); 649 if (nb_live) { 650 *nb_live = nb_live1; 651 } 652 653 if (nb_live1) { 654 size_t live = smin; 655 656 if (audio_bug(__func__, live > hw->mix_buf->size)) { 657 dolog("live=%zu hw->mix_buf->size=%zu\n", live, hw->mix_buf->size); 658 abort(); 659 } 660 return live; 661 } 662 return 0; 663 } 664 665 static size_t audio_pcm_hw_get_free(HWVoiceOut *hw) 666 { 667 return (hw->pcm_ops->buffer_get_free ? hw->pcm_ops->buffer_get_free(hw) : 668 INT_MAX) / hw->info.bytes_per_frame; 669 } 670 671 static void audio_pcm_hw_clip_out(HWVoiceOut *hw, void *pcm_buf, size_t len) 672 { 673 size_t clipped = 0; 674 size_t pos = hw->mix_buf->pos; 675 676 while (len) { 677 st_sample *src = hw->mix_buf->samples + pos; 678 uint8_t *dst = advance(pcm_buf, clipped * hw->info.bytes_per_frame); 679 size_t samples_till_end_of_buf = hw->mix_buf->size - pos; 680 size_t samples_to_clip = MIN(len, samples_till_end_of_buf); 681 682 hw->clip(dst, src, samples_to_clip); 683 684 pos = (pos + samples_to_clip) % hw->mix_buf->size; 685 len -= samples_to_clip; 686 clipped += samples_to_clip; 687 } 688 } 689 690 /* 691 * Soft voice (playback) 692 */ 693 static size_t audio_pcm_sw_write(SWVoiceOut *sw, void *buf, size_t size) 694 { 695 size_t hwsamples, samples, isamp, osamp, wpos, live, dead, left, blck; 696 size_t hw_free; 697 size_t ret = 0, pos = 0, total = 0; 698 699 if (!sw) { 700 return size; 701 } 702 703 hwsamples = sw->hw->mix_buf->size; 704 705 live = sw->total_hw_samples_mixed; 706 if (audio_bug(__func__, live > hwsamples)) { 707 dolog("live=%zu hw->mix_buf->size=%zu\n", live, hwsamples); 708 abort(); 709 } 710 711 if (live == hwsamples) { 712 #ifdef DEBUG_OUT 713 dolog ("%s is full %zu\n", sw->name, live); 714 #endif 715 return 0; 716 } 717 718 wpos = (sw->hw->mix_buf->pos + live) % hwsamples; 719 720 dead = hwsamples - live; 721 hw_free = audio_pcm_hw_get_free(sw->hw); 722 hw_free = hw_free > live ? hw_free - live : 0; 723 samples = ((int64_t)MIN(dead, hw_free) << 32) / sw->ratio; 724 samples = MIN(samples, size / sw->info.bytes_per_frame); 725 if (samples) { 726 sw->conv(sw->buf, buf, samples); 727 728 if (!sw->hw->pcm_ops->volume_out) { 729 mixeng_volume(sw->buf, samples, &sw->vol); 730 } 731 } 732 733 while (samples) { 734 dead = hwsamples - live; 735 left = hwsamples - wpos; 736 blck = MIN (dead, left); 737 if (!blck) { 738 break; 739 } 740 isamp = samples; 741 osamp = blck; 742 st_rate_flow_mix ( 743 sw->rate, 744 sw->buf + pos, 745 sw->hw->mix_buf->samples + wpos, 746 &isamp, 747 &osamp 748 ); 749 ret += isamp; 750 samples -= isamp; 751 pos += isamp; 752 live += osamp; 753 wpos = (wpos + osamp) % hwsamples; 754 total += osamp; 755 } 756 757 sw->total_hw_samples_mixed += total; 758 sw->empty = sw->total_hw_samples_mixed == 0; 759 760 #ifdef DEBUG_OUT 761 dolog ( 762 "%s: write size %zu ret %zu total sw %zu\n", 763 SW_NAME (sw), 764 size / sw->info.bytes_per_frame, 765 ret, 766 sw->total_hw_samples_mixed 767 ); 768 #endif 769 770 return ret * sw->info.bytes_per_frame; 771 } 772 773 #ifdef DEBUG_AUDIO 774 static void audio_pcm_print_info (const char *cap, struct audio_pcm_info *info) 775 { 776 dolog("%s: bits %d, sign %d, float %d, freq %d, nchan %d\n", 777 cap, info->bits, info->is_signed, info->is_float, info->freq, 778 info->nchannels); 779 } 780 #endif 781 782 #define DAC 783 #include "audio_template.h" 784 #undef DAC 785 #include "audio_template.h" 786 787 /* 788 * Timer 789 */ 790 static int audio_is_timer_needed(AudioState *s) 791 { 792 HWVoiceIn *hwi = NULL; 793 HWVoiceOut *hwo = NULL; 794 795 while ((hwo = audio_pcm_hw_find_any_enabled_out(s, hwo))) { 796 if (!hwo->poll_mode) { 797 return 1; 798 } 799 } 800 while ((hwi = audio_pcm_hw_find_any_enabled_in(s, hwi))) { 801 if (!hwi->poll_mode) { 802 return 1; 803 } 804 } 805 return 0; 806 } 807 808 static void audio_reset_timer (AudioState *s) 809 { 810 if (audio_is_timer_needed(s)) { 811 timer_mod_anticipate_ns(s->ts, 812 qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + s->period_ticks); 813 if (!s->timer_running) { 814 s->timer_running = true; 815 s->timer_last = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 816 trace_audio_timer_start(s->period_ticks / SCALE_MS); 817 } 818 } else { 819 timer_del(s->ts); 820 if (s->timer_running) { 821 s->timer_running = false; 822 trace_audio_timer_stop(); 823 } 824 } 825 } 826 827 static void audio_timer (void *opaque) 828 { 829 int64_t now, diff; 830 AudioState *s = opaque; 831 832 now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 833 diff = now - s->timer_last; 834 if (diff > s->period_ticks * 3 / 2) { 835 trace_audio_timer_delayed(diff / SCALE_MS); 836 } 837 s->timer_last = now; 838 839 audio_run(s, "timer"); 840 audio_reset_timer(s); 841 } 842 843 /* 844 * Public API 845 */ 846 size_t AUD_write(SWVoiceOut *sw, void *buf, size_t size) 847 { 848 HWVoiceOut *hw; 849 850 if (!sw) { 851 /* XXX: Consider options */ 852 return size; 853 } 854 hw = sw->hw; 855 856 if (!hw->enabled) { 857 dolog ("Writing to disabled voice %s\n", SW_NAME (sw)); 858 return 0; 859 } 860 861 if (audio_get_pdo_out(hw->s->dev)->mixing_engine) { 862 return audio_pcm_sw_write(sw, buf, size); 863 } else { 864 return hw->pcm_ops->write(hw, buf, size); 865 } 866 } 867 868 size_t AUD_read(SWVoiceIn *sw, void *buf, size_t size) 869 { 870 HWVoiceIn *hw; 871 872 if (!sw) { 873 /* XXX: Consider options */ 874 return size; 875 } 876 hw = sw->hw; 877 878 if (!hw->enabled) { 879 dolog ("Reading from disabled voice %s\n", SW_NAME (sw)); 880 return 0; 881 } 882 883 if (audio_get_pdo_in(hw->s->dev)->mixing_engine) { 884 return audio_pcm_sw_read(sw, buf, size); 885 } else { 886 return hw->pcm_ops->read(hw, buf, size); 887 } 888 } 889 890 int AUD_get_buffer_size_out(SWVoiceOut *sw) 891 { 892 return sw->hw->samples * sw->hw->info.bytes_per_frame; 893 } 894 895 void AUD_set_active_out (SWVoiceOut *sw, int on) 896 { 897 HWVoiceOut *hw; 898 899 if (!sw) { 900 return; 901 } 902 903 hw = sw->hw; 904 if (sw->active != on) { 905 AudioState *s = sw->s; 906 SWVoiceOut *temp_sw; 907 SWVoiceCap *sc; 908 909 if (on) { 910 hw->pending_disable = 0; 911 if (!hw->enabled) { 912 hw->enabled = 1; 913 if (s->vm_running) { 914 if (hw->pcm_ops->enable_out) { 915 hw->pcm_ops->enable_out(hw, true); 916 } 917 audio_reset_timer (s); 918 } 919 } 920 } else { 921 if (hw->enabled) { 922 int nb_active = 0; 923 924 for (temp_sw = hw->sw_head.lh_first; temp_sw; 925 temp_sw = temp_sw->entries.le_next) { 926 nb_active += temp_sw->active != 0; 927 } 928 929 hw->pending_disable = nb_active == 1; 930 } 931 } 932 933 for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) { 934 sc->sw.active = hw->enabled; 935 if (hw->enabled) { 936 audio_capture_maybe_changed (sc->cap, 1); 937 } 938 } 939 sw->active = on; 940 } 941 } 942 943 void AUD_set_active_in (SWVoiceIn *sw, int on) 944 { 945 HWVoiceIn *hw; 946 947 if (!sw) { 948 return; 949 } 950 951 hw = sw->hw; 952 if (sw->active != on) { 953 AudioState *s = sw->s; 954 SWVoiceIn *temp_sw; 955 956 if (on) { 957 if (!hw->enabled) { 958 hw->enabled = 1; 959 if (s->vm_running) { 960 if (hw->pcm_ops->enable_in) { 961 hw->pcm_ops->enable_in(hw, true); 962 } 963 audio_reset_timer (s); 964 } 965 } 966 sw->total_hw_samples_acquired = hw->total_samples_captured; 967 } else { 968 if (hw->enabled) { 969 int nb_active = 0; 970 971 for (temp_sw = hw->sw_head.lh_first; temp_sw; 972 temp_sw = temp_sw->entries.le_next) { 973 nb_active += temp_sw->active != 0; 974 } 975 976 if (nb_active == 1) { 977 hw->enabled = 0; 978 if (hw->pcm_ops->enable_in) { 979 hw->pcm_ops->enable_in(hw, false); 980 } 981 } 982 } 983 } 984 sw->active = on; 985 } 986 } 987 988 static size_t audio_get_avail (SWVoiceIn *sw) 989 { 990 size_t live; 991 992 if (!sw) { 993 return 0; 994 } 995 996 live = sw->hw->total_samples_captured - sw->total_hw_samples_acquired; 997 if (audio_bug(__func__, live > sw->hw->conv_buf->size)) { 998 dolog("live=%zu sw->hw->conv_buf->size=%zu\n", live, 999 sw->hw->conv_buf->size); 1000 abort(); 1001 } 1002 1003 ldebug ( 1004 "%s: get_avail live %zu ret %" PRId64 "\n", 1005 SW_NAME (sw), 1006 live, (((int64_t) live << 32) / sw->ratio) * sw->info.bytes_per_frame 1007 ); 1008 1009 return (((int64_t) live << 32) / sw->ratio) * sw->info.bytes_per_frame; 1010 } 1011 1012 static size_t audio_sw_bytes_free(SWVoiceOut *sw, size_t free) 1013 { 1014 return (((int64_t)free << 32) / sw->ratio) * sw->info.bytes_per_frame; 1015 } 1016 1017 static size_t audio_get_free(SWVoiceOut *sw) 1018 { 1019 size_t live, dead; 1020 1021 if (!sw) { 1022 return 0; 1023 } 1024 1025 live = sw->total_hw_samples_mixed; 1026 1027 if (audio_bug(__func__, live > sw->hw->mix_buf->size)) { 1028 dolog("live=%zu sw->hw->mix_buf->size=%zu\n", live, 1029 sw->hw->mix_buf->size); 1030 abort(); 1031 } 1032 1033 dead = sw->hw->mix_buf->size - live; 1034 1035 #ifdef DEBUG_OUT 1036 dolog("%s: get_free live %zu dead %zu sw_bytes %zu\n", 1037 SW_NAME(sw), live, dead, audio_sw_bytes_free(sw, dead)); 1038 #endif 1039 1040 return dead; 1041 } 1042 1043 static void audio_capture_mix_and_clear(HWVoiceOut *hw, size_t rpos, 1044 size_t samples) 1045 { 1046 size_t n; 1047 1048 if (hw->enabled) { 1049 SWVoiceCap *sc; 1050 1051 for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) { 1052 SWVoiceOut *sw = &sc->sw; 1053 int rpos2 = rpos; 1054 1055 n = samples; 1056 while (n) { 1057 size_t till_end_of_hw = hw->mix_buf->size - rpos2; 1058 size_t to_write = MIN(till_end_of_hw, n); 1059 size_t bytes = to_write * hw->info.bytes_per_frame; 1060 size_t written; 1061 1062 sw->buf = hw->mix_buf->samples + rpos2; 1063 written = audio_pcm_sw_write (sw, NULL, bytes); 1064 if (written - bytes) { 1065 dolog("Could not mix %zu bytes into a capture " 1066 "buffer, mixed %zu\n", 1067 bytes, written); 1068 break; 1069 } 1070 n -= to_write; 1071 rpos2 = (rpos2 + to_write) % hw->mix_buf->size; 1072 } 1073 } 1074 } 1075 1076 n = MIN(samples, hw->mix_buf->size - rpos); 1077 mixeng_clear(hw->mix_buf->samples + rpos, n); 1078 mixeng_clear(hw->mix_buf->samples, samples - n); 1079 } 1080 1081 static size_t audio_pcm_hw_run_out(HWVoiceOut *hw, size_t live) 1082 { 1083 size_t clipped = 0; 1084 1085 while (live) { 1086 size_t size = live * hw->info.bytes_per_frame; 1087 size_t decr, proc; 1088 void *buf = hw->pcm_ops->get_buffer_out(hw, &size); 1089 1090 if (size == 0) { 1091 break; 1092 } 1093 1094 decr = MIN(size / hw->info.bytes_per_frame, live); 1095 if (buf) { 1096 audio_pcm_hw_clip_out(hw, buf, decr); 1097 } 1098 proc = hw->pcm_ops->put_buffer_out(hw, buf, 1099 decr * hw->info.bytes_per_frame) / 1100 hw->info.bytes_per_frame; 1101 1102 live -= proc; 1103 clipped += proc; 1104 hw->mix_buf->pos = (hw->mix_buf->pos + proc) % hw->mix_buf->size; 1105 1106 if (proc == 0 || proc < decr) { 1107 break; 1108 } 1109 } 1110 1111 if (hw->pcm_ops->run_buffer_out) { 1112 hw->pcm_ops->run_buffer_out(hw); 1113 } 1114 1115 return clipped; 1116 } 1117 1118 static void audio_run_out (AudioState *s) 1119 { 1120 HWVoiceOut *hw = NULL; 1121 SWVoiceOut *sw; 1122 1123 if (!audio_get_pdo_out(s->dev)->mixing_engine) { 1124 while ((hw = audio_pcm_hw_find_any_enabled_out(s, hw))) { 1125 /* there is exactly 1 sw for each hw with no mixeng */ 1126 sw = hw->sw_head.lh_first; 1127 1128 if (hw->pending_disable) { 1129 hw->enabled = 0; 1130 hw->pending_disable = 0; 1131 if (hw->pcm_ops->enable_out) { 1132 hw->pcm_ops->enable_out(hw, false); 1133 } 1134 } 1135 1136 if (sw->active) { 1137 sw->callback.fn(sw->callback.opaque, INT_MAX); 1138 } 1139 } 1140 return; 1141 } 1142 1143 while ((hw = audio_pcm_hw_find_any_enabled_out(s, hw))) { 1144 size_t played, live, prev_rpos; 1145 size_t hw_free = audio_pcm_hw_get_free(hw); 1146 int nb_live; 1147 1148 for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) { 1149 if (sw->active) { 1150 size_t sw_free = audio_get_free(sw); 1151 size_t free; 1152 1153 if (hw_free > sw->total_hw_samples_mixed) { 1154 free = audio_sw_bytes_free(sw, 1155 MIN(sw_free, hw_free - sw->total_hw_samples_mixed)); 1156 } else { 1157 free = 0; 1158 } 1159 if (free > 0) { 1160 sw->callback.fn(sw->callback.opaque, free); 1161 } 1162 } 1163 } 1164 1165 live = audio_pcm_hw_get_live_out (hw, &nb_live); 1166 if (!nb_live) { 1167 live = 0; 1168 } 1169 1170 if (audio_bug(__func__, live > hw->mix_buf->size)) { 1171 dolog("live=%zu hw->mix_buf->size=%zu\n", live, hw->mix_buf->size); 1172 abort(); 1173 } 1174 1175 if (hw->pending_disable && !nb_live) { 1176 SWVoiceCap *sc; 1177 #ifdef DEBUG_OUT 1178 dolog ("Disabling voice\n"); 1179 #endif 1180 hw->enabled = 0; 1181 hw->pending_disable = 0; 1182 if (hw->pcm_ops->enable_out) { 1183 hw->pcm_ops->enable_out(hw, false); 1184 } 1185 for (sc = hw->cap_head.lh_first; sc; sc = sc->entries.le_next) { 1186 sc->sw.active = 0; 1187 audio_recalc_and_notify_capture (sc->cap); 1188 } 1189 continue; 1190 } 1191 1192 if (!live) { 1193 if (hw->pcm_ops->run_buffer_out) { 1194 hw->pcm_ops->run_buffer_out(hw); 1195 } 1196 continue; 1197 } 1198 1199 prev_rpos = hw->mix_buf->pos; 1200 played = audio_pcm_hw_run_out(hw, live); 1201 replay_audio_out(&played); 1202 if (audio_bug(__func__, hw->mix_buf->pos >= hw->mix_buf->size)) { 1203 dolog("hw->mix_buf->pos=%zu hw->mix_buf->size=%zu played=%zu\n", 1204 hw->mix_buf->pos, hw->mix_buf->size, played); 1205 abort(); 1206 } 1207 1208 #ifdef DEBUG_OUT 1209 dolog("played=%zu\n", played); 1210 #endif 1211 1212 if (played) { 1213 hw->ts_helper += played; 1214 audio_capture_mix_and_clear (hw, prev_rpos, played); 1215 } 1216 1217 for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) { 1218 if (!sw->active && sw->empty) { 1219 continue; 1220 } 1221 1222 if (audio_bug(__func__, played > sw->total_hw_samples_mixed)) { 1223 dolog("played=%zu sw->total_hw_samples_mixed=%zu\n", 1224 played, sw->total_hw_samples_mixed); 1225 abort(); 1226 } 1227 1228 sw->total_hw_samples_mixed -= played; 1229 1230 if (!sw->total_hw_samples_mixed) { 1231 sw->empty = 1; 1232 } 1233 } 1234 } 1235 } 1236 1237 static size_t audio_pcm_hw_run_in(HWVoiceIn *hw, size_t samples) 1238 { 1239 size_t conv = 0; 1240 1241 if (hw->pcm_ops->run_buffer_in) { 1242 hw->pcm_ops->run_buffer_in(hw); 1243 } 1244 1245 while (samples) { 1246 size_t proc; 1247 size_t size = samples * hw->info.bytes_per_frame; 1248 void *buf = hw->pcm_ops->get_buffer_in(hw, &size); 1249 1250 assert(size % hw->info.bytes_per_frame == 0); 1251 if (size == 0) { 1252 break; 1253 } 1254 1255 proc = audio_pcm_hw_conv_in(hw, buf, size / hw->info.bytes_per_frame); 1256 1257 samples -= proc; 1258 conv += proc; 1259 hw->pcm_ops->put_buffer_in(hw, buf, proc * hw->info.bytes_per_frame); 1260 } 1261 1262 return conv; 1263 } 1264 1265 static void audio_run_in (AudioState *s) 1266 { 1267 HWVoiceIn *hw = NULL; 1268 1269 if (!audio_get_pdo_in(s->dev)->mixing_engine) { 1270 while ((hw = audio_pcm_hw_find_any_enabled_in(s, hw))) { 1271 /* there is exactly 1 sw for each hw with no mixeng */ 1272 SWVoiceIn *sw = hw->sw_head.lh_first; 1273 if (sw->active) { 1274 sw->callback.fn(sw->callback.opaque, INT_MAX); 1275 } 1276 } 1277 return; 1278 } 1279 1280 while ((hw = audio_pcm_hw_find_any_enabled_in(s, hw))) { 1281 SWVoiceIn *sw; 1282 size_t captured = 0, min; 1283 1284 if (replay_mode != REPLAY_MODE_PLAY) { 1285 captured = audio_pcm_hw_run_in( 1286 hw, hw->conv_buf->size - audio_pcm_hw_get_live_in(hw)); 1287 } 1288 replay_audio_in(&captured, hw->conv_buf->samples, &hw->conv_buf->pos, 1289 hw->conv_buf->size); 1290 1291 min = audio_pcm_hw_find_min_in (hw); 1292 hw->total_samples_captured += captured - min; 1293 hw->ts_helper += captured; 1294 1295 for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) { 1296 sw->total_hw_samples_acquired -= min; 1297 1298 if (sw->active) { 1299 size_t avail; 1300 1301 avail = audio_get_avail (sw); 1302 if (avail > 0) { 1303 sw->callback.fn (sw->callback.opaque, avail); 1304 } 1305 } 1306 } 1307 } 1308 } 1309 1310 static void audio_run_capture (AudioState *s) 1311 { 1312 CaptureVoiceOut *cap; 1313 1314 for (cap = s->cap_head.lh_first; cap; cap = cap->entries.le_next) { 1315 size_t live, rpos, captured; 1316 HWVoiceOut *hw = &cap->hw; 1317 SWVoiceOut *sw; 1318 1319 captured = live = audio_pcm_hw_get_live_out (hw, NULL); 1320 rpos = hw->mix_buf->pos; 1321 while (live) { 1322 size_t left = hw->mix_buf->size - rpos; 1323 size_t to_capture = MIN(live, left); 1324 struct st_sample *src; 1325 struct capture_callback *cb; 1326 1327 src = hw->mix_buf->samples + rpos; 1328 hw->clip (cap->buf, src, to_capture); 1329 mixeng_clear (src, to_capture); 1330 1331 for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) { 1332 cb->ops.capture (cb->opaque, cap->buf, 1333 to_capture * hw->info.bytes_per_frame); 1334 } 1335 rpos = (rpos + to_capture) % hw->mix_buf->size; 1336 live -= to_capture; 1337 } 1338 hw->mix_buf->pos = rpos; 1339 1340 for (sw = hw->sw_head.lh_first; sw; sw = sw->entries.le_next) { 1341 if (!sw->active && sw->empty) { 1342 continue; 1343 } 1344 1345 if (audio_bug(__func__, captured > sw->total_hw_samples_mixed)) { 1346 dolog("captured=%zu sw->total_hw_samples_mixed=%zu\n", 1347 captured, sw->total_hw_samples_mixed); 1348 abort(); 1349 } 1350 1351 sw->total_hw_samples_mixed -= captured; 1352 sw->empty = sw->total_hw_samples_mixed == 0; 1353 } 1354 } 1355 } 1356 1357 void audio_run(AudioState *s, const char *msg) 1358 { 1359 audio_run_out(s); 1360 audio_run_in(s); 1361 audio_run_capture(s); 1362 1363 #ifdef DEBUG_POLL 1364 { 1365 static double prevtime; 1366 double currtime; 1367 struct timeval tv; 1368 1369 if (gettimeofday (&tv, NULL)) { 1370 perror ("audio_run: gettimeofday"); 1371 return; 1372 } 1373 1374 currtime = tv.tv_sec + tv.tv_usec * 1e-6; 1375 dolog ("Elapsed since last %s: %f\n", msg, currtime - prevtime); 1376 prevtime = currtime; 1377 } 1378 #endif 1379 } 1380 1381 void audio_generic_run_buffer_in(HWVoiceIn *hw) 1382 { 1383 if (unlikely(!hw->buf_emul)) { 1384 hw->size_emul = hw->samples * hw->info.bytes_per_frame; 1385 hw->buf_emul = g_malloc(hw->size_emul); 1386 hw->pos_emul = hw->pending_emul = 0; 1387 } 1388 1389 while (hw->pending_emul < hw->size_emul) { 1390 size_t read_len = MIN(hw->size_emul - hw->pos_emul, 1391 hw->size_emul - hw->pending_emul); 1392 size_t read = hw->pcm_ops->read(hw, hw->buf_emul + hw->pos_emul, 1393 read_len); 1394 hw->pending_emul += read; 1395 hw->pos_emul = (hw->pos_emul + read) % hw->size_emul; 1396 if (read < read_len) { 1397 break; 1398 } 1399 } 1400 } 1401 1402 void *audio_generic_get_buffer_in(HWVoiceIn *hw, size_t *size) 1403 { 1404 size_t start; 1405 1406 start = audio_ring_posb(hw->pos_emul, hw->pending_emul, hw->size_emul); 1407 assert(start < hw->size_emul); 1408 1409 *size = MIN(*size, hw->pending_emul); 1410 *size = MIN(*size, hw->size_emul - start); 1411 return hw->buf_emul + start; 1412 } 1413 1414 void audio_generic_put_buffer_in(HWVoiceIn *hw, void *buf, size_t size) 1415 { 1416 assert(size <= hw->pending_emul); 1417 hw->pending_emul -= size; 1418 } 1419 1420 size_t audio_generic_buffer_get_free(HWVoiceOut *hw) 1421 { 1422 if (hw->buf_emul) { 1423 return hw->size_emul - hw->pending_emul; 1424 } else { 1425 return hw->samples * hw->info.bytes_per_frame; 1426 } 1427 } 1428 1429 void audio_generic_run_buffer_out(HWVoiceOut *hw) 1430 { 1431 while (hw->pending_emul) { 1432 size_t write_len, written, start; 1433 1434 start = audio_ring_posb(hw->pos_emul, hw->pending_emul, hw->size_emul); 1435 assert(start < hw->size_emul); 1436 1437 write_len = MIN(hw->pending_emul, hw->size_emul - start); 1438 1439 written = hw->pcm_ops->write(hw, hw->buf_emul + start, write_len); 1440 hw->pending_emul -= written; 1441 1442 if (written < write_len) { 1443 break; 1444 } 1445 } 1446 } 1447 1448 void *audio_generic_get_buffer_out(HWVoiceOut *hw, size_t *size) 1449 { 1450 if (unlikely(!hw->buf_emul)) { 1451 hw->size_emul = hw->samples * hw->info.bytes_per_frame; 1452 hw->buf_emul = g_malloc(hw->size_emul); 1453 hw->pos_emul = hw->pending_emul = 0; 1454 } 1455 1456 *size = MIN(hw->size_emul - hw->pending_emul, 1457 hw->size_emul - hw->pos_emul); 1458 return hw->buf_emul + hw->pos_emul; 1459 } 1460 1461 size_t audio_generic_put_buffer_out(HWVoiceOut *hw, void *buf, size_t size) 1462 { 1463 assert(buf == hw->buf_emul + hw->pos_emul && 1464 size + hw->pending_emul <= hw->size_emul); 1465 1466 hw->pending_emul += size; 1467 hw->pos_emul = (hw->pos_emul + size) % hw->size_emul; 1468 1469 return size; 1470 } 1471 1472 size_t audio_generic_write(HWVoiceOut *hw, void *buf, size_t size) 1473 { 1474 size_t total = 0; 1475 1476 if (hw->pcm_ops->buffer_get_free) { 1477 size_t free = hw->pcm_ops->buffer_get_free(hw); 1478 1479 size = MIN(size, free); 1480 } 1481 1482 while (total < size) { 1483 size_t dst_size = size - total; 1484 size_t copy_size, proc; 1485 void *dst = hw->pcm_ops->get_buffer_out(hw, &dst_size); 1486 1487 if (dst_size == 0) { 1488 break; 1489 } 1490 1491 copy_size = MIN(size - total, dst_size); 1492 if (dst) { 1493 memcpy(dst, (char *)buf + total, copy_size); 1494 } 1495 proc = hw->pcm_ops->put_buffer_out(hw, dst, copy_size); 1496 total += proc; 1497 1498 if (proc == 0 || proc < copy_size) { 1499 break; 1500 } 1501 } 1502 1503 if (hw->pcm_ops->run_buffer_out) { 1504 hw->pcm_ops->run_buffer_out(hw); 1505 } 1506 1507 return total; 1508 } 1509 1510 size_t audio_generic_read(HWVoiceIn *hw, void *buf, size_t size) 1511 { 1512 size_t total = 0; 1513 1514 if (hw->pcm_ops->run_buffer_in) { 1515 hw->pcm_ops->run_buffer_in(hw); 1516 } 1517 1518 while (total < size) { 1519 size_t src_size = size - total; 1520 void *src = hw->pcm_ops->get_buffer_in(hw, &src_size); 1521 1522 if (src_size == 0) { 1523 break; 1524 } 1525 1526 memcpy((char *)buf + total, src, src_size); 1527 hw->pcm_ops->put_buffer_in(hw, src, src_size); 1528 total += src_size; 1529 } 1530 1531 return total; 1532 } 1533 1534 static int audio_driver_init(AudioState *s, struct audio_driver *drv, 1535 bool msg, Audiodev *dev) 1536 { 1537 s->drv_opaque = drv->init(dev); 1538 1539 if (s->drv_opaque) { 1540 if (!drv->pcm_ops->get_buffer_in) { 1541 drv->pcm_ops->get_buffer_in = audio_generic_get_buffer_in; 1542 drv->pcm_ops->put_buffer_in = audio_generic_put_buffer_in; 1543 } 1544 if (!drv->pcm_ops->get_buffer_out) { 1545 drv->pcm_ops->get_buffer_out = audio_generic_get_buffer_out; 1546 drv->pcm_ops->put_buffer_out = audio_generic_put_buffer_out; 1547 } 1548 1549 audio_init_nb_voices_out(s, drv); 1550 audio_init_nb_voices_in(s, drv); 1551 s->drv = drv; 1552 return 0; 1553 } else { 1554 if (msg) { 1555 dolog("Could not init `%s' audio driver\n", drv->name); 1556 } 1557 return -1; 1558 } 1559 } 1560 1561 static void audio_vm_change_state_handler (void *opaque, bool running, 1562 RunState state) 1563 { 1564 AudioState *s = opaque; 1565 HWVoiceOut *hwo = NULL; 1566 HWVoiceIn *hwi = NULL; 1567 1568 s->vm_running = running; 1569 while ((hwo = audio_pcm_hw_find_any_enabled_out(s, hwo))) { 1570 if (hwo->pcm_ops->enable_out) { 1571 hwo->pcm_ops->enable_out(hwo, running); 1572 } 1573 } 1574 1575 while ((hwi = audio_pcm_hw_find_any_enabled_in(s, hwi))) { 1576 if (hwi->pcm_ops->enable_in) { 1577 hwi->pcm_ops->enable_in(hwi, running); 1578 } 1579 } 1580 audio_reset_timer (s); 1581 } 1582 1583 static void free_audio_state(AudioState *s) 1584 { 1585 HWVoiceOut *hwo, *hwon; 1586 HWVoiceIn *hwi, *hwin; 1587 1588 QLIST_FOREACH_SAFE(hwo, &s->hw_head_out, entries, hwon) { 1589 SWVoiceCap *sc; 1590 1591 if (hwo->enabled && hwo->pcm_ops->enable_out) { 1592 hwo->pcm_ops->enable_out(hwo, false); 1593 } 1594 hwo->pcm_ops->fini_out (hwo); 1595 1596 for (sc = hwo->cap_head.lh_first; sc; sc = sc->entries.le_next) { 1597 CaptureVoiceOut *cap = sc->cap; 1598 struct capture_callback *cb; 1599 1600 for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) { 1601 cb->ops.destroy (cb->opaque); 1602 } 1603 } 1604 QLIST_REMOVE(hwo, entries); 1605 } 1606 1607 QLIST_FOREACH_SAFE(hwi, &s->hw_head_in, entries, hwin) { 1608 if (hwi->enabled && hwi->pcm_ops->enable_in) { 1609 hwi->pcm_ops->enable_in(hwi, false); 1610 } 1611 hwi->pcm_ops->fini_in (hwi); 1612 QLIST_REMOVE(hwi, entries); 1613 } 1614 1615 if (s->drv) { 1616 s->drv->fini (s->drv_opaque); 1617 s->drv = NULL; 1618 } 1619 1620 if (s->dev) { 1621 qapi_free_Audiodev(s->dev); 1622 s->dev = NULL; 1623 } 1624 1625 if (s->ts) { 1626 timer_free(s->ts); 1627 s->ts = NULL; 1628 } 1629 1630 g_free(s); 1631 } 1632 1633 void audio_cleanup(void) 1634 { 1635 while (!QTAILQ_EMPTY(&audio_states)) { 1636 AudioState *s = QTAILQ_FIRST(&audio_states); 1637 QTAILQ_REMOVE(&audio_states, s, list); 1638 free_audio_state(s); 1639 } 1640 } 1641 1642 static bool vmstate_audio_needed(void *opaque) 1643 { 1644 /* 1645 * Never needed, this vmstate only exists in case 1646 * an old qemu sends it to us. 1647 */ 1648 return false; 1649 } 1650 1651 static const VMStateDescription vmstate_audio = { 1652 .name = "audio", 1653 .version_id = 1, 1654 .minimum_version_id = 1, 1655 .needed = vmstate_audio_needed, 1656 .fields = (VMStateField[]) { 1657 VMSTATE_END_OF_LIST() 1658 } 1659 }; 1660 1661 static void audio_validate_opts(Audiodev *dev, Error **errp); 1662 1663 static AudiodevListEntry *audiodev_find( 1664 AudiodevListHead *head, const char *drvname) 1665 { 1666 AudiodevListEntry *e; 1667 QSIMPLEQ_FOREACH(e, head, next) { 1668 if (strcmp(AudiodevDriver_str(e->dev->driver), drvname) == 0) { 1669 return e; 1670 } 1671 } 1672 1673 return NULL; 1674 } 1675 1676 /* 1677 * if we have dev, this function was called because of an -audiodev argument => 1678 * initialize a new state with it 1679 * if dev == NULL => legacy implicit initialization, return the already created 1680 * state or create a new one 1681 */ 1682 static AudioState *audio_init(Audiodev *dev, const char *name) 1683 { 1684 static bool atexit_registered; 1685 size_t i; 1686 int done = 0; 1687 const char *drvname = NULL; 1688 VMChangeStateEntry *e; 1689 AudioState *s; 1690 struct audio_driver *driver; 1691 /* silence gcc warning about uninitialized variable */ 1692 AudiodevListHead head = QSIMPLEQ_HEAD_INITIALIZER(head); 1693 1694 if (using_spice) { 1695 /* 1696 * When using spice allow the spice audio driver being picked 1697 * as default. 1698 * 1699 * Temporary hack. Using audio devices without explicit 1700 * audiodev= property is already deprecated. Same goes for 1701 * the -soundhw switch. Once this support gets finally 1702 * removed we can also drop the concept of a default audio 1703 * backend and this can go away. 1704 */ 1705 driver = audio_driver_lookup("spice"); 1706 if (driver) { 1707 driver->can_be_default = 1; 1708 } 1709 } 1710 1711 if (dev) { 1712 /* -audiodev option */ 1713 legacy_config = false; 1714 drvname = AudiodevDriver_str(dev->driver); 1715 } else if (!QTAILQ_EMPTY(&audio_states)) { 1716 if (!legacy_config) { 1717 dolog("Device %s: audiodev default parameter is deprecated, please " 1718 "specify audiodev=%s\n", name, 1719 QTAILQ_FIRST(&audio_states)->dev->id); 1720 } 1721 return QTAILQ_FIRST(&audio_states); 1722 } else { 1723 /* legacy implicit initialization */ 1724 head = audio_handle_legacy_opts(); 1725 /* 1726 * In case of legacy initialization, all Audiodevs in the list will have 1727 * the same configuration (except the driver), so it doesn't matter which 1728 * one we chose. We need an Audiodev to set up AudioState before we can 1729 * init a driver. Also note that dev at this point is still in the 1730 * list. 1731 */ 1732 dev = QSIMPLEQ_FIRST(&head)->dev; 1733 audio_validate_opts(dev, &error_abort); 1734 } 1735 1736 s = g_new0(AudioState, 1); 1737 s->dev = dev; 1738 1739 QLIST_INIT (&s->hw_head_out); 1740 QLIST_INIT (&s->hw_head_in); 1741 QLIST_INIT (&s->cap_head); 1742 if (!atexit_registered) { 1743 atexit(audio_cleanup); 1744 atexit_registered = true; 1745 } 1746 QTAILQ_INSERT_TAIL(&audio_states, s, list); 1747 1748 s->ts = timer_new_ns(QEMU_CLOCK_VIRTUAL, audio_timer, s); 1749 1750 s->nb_hw_voices_out = audio_get_pdo_out(dev)->voices; 1751 s->nb_hw_voices_in = audio_get_pdo_in(dev)->voices; 1752 1753 if (s->nb_hw_voices_out <= 0) { 1754 dolog ("Bogus number of playback voices %d, setting to 1\n", 1755 s->nb_hw_voices_out); 1756 s->nb_hw_voices_out = 1; 1757 } 1758 1759 if (s->nb_hw_voices_in <= 0) { 1760 dolog ("Bogus number of capture voices %d, setting to 0\n", 1761 s->nb_hw_voices_in); 1762 s->nb_hw_voices_in = 0; 1763 } 1764 1765 if (drvname) { 1766 driver = audio_driver_lookup(drvname); 1767 if (driver) { 1768 done = !audio_driver_init(s, driver, true, dev); 1769 } else { 1770 dolog ("Unknown audio driver `%s'\n", drvname); 1771 } 1772 } else { 1773 for (i = 0; audio_prio_list[i]; i++) { 1774 AudiodevListEntry *e = audiodev_find(&head, audio_prio_list[i]); 1775 driver = audio_driver_lookup(audio_prio_list[i]); 1776 1777 if (e && driver) { 1778 s->dev = dev = e->dev; 1779 audio_validate_opts(dev, &error_abort); 1780 done = !audio_driver_init(s, driver, false, dev); 1781 if (done) { 1782 e->dev = NULL; 1783 break; 1784 } 1785 } 1786 } 1787 } 1788 audio_free_audiodev_list(&head); 1789 1790 if (!done) { 1791 driver = audio_driver_lookup("none"); 1792 done = !audio_driver_init(s, driver, false, dev); 1793 assert(done); 1794 dolog("warning: Using timer based audio emulation\n"); 1795 } 1796 1797 if (dev->timer_period <= 0) { 1798 s->period_ticks = 1; 1799 } else { 1800 s->period_ticks = dev->timer_period * (int64_t)SCALE_US; 1801 } 1802 1803 e = qemu_add_vm_change_state_handler (audio_vm_change_state_handler, s); 1804 if (!e) { 1805 dolog ("warning: Could not register change state handler\n" 1806 "(Audio can continue looping even after stopping the VM)\n"); 1807 } 1808 1809 QLIST_INIT (&s->card_head); 1810 vmstate_register (NULL, 0, &vmstate_audio, s); 1811 return s; 1812 } 1813 1814 void audio_free_audiodev_list(AudiodevListHead *head) 1815 { 1816 AudiodevListEntry *e; 1817 while ((e = QSIMPLEQ_FIRST(head))) { 1818 QSIMPLEQ_REMOVE_HEAD(head, next); 1819 qapi_free_Audiodev(e->dev); 1820 g_free(e); 1821 } 1822 } 1823 1824 void AUD_register_card (const char *name, QEMUSoundCard *card) 1825 { 1826 if (!card->state) { 1827 card->state = audio_init(NULL, name); 1828 } 1829 1830 card->name = g_strdup (name); 1831 memset (&card->entries, 0, sizeof (card->entries)); 1832 QLIST_INSERT_HEAD(&card->state->card_head, card, entries); 1833 } 1834 1835 void AUD_remove_card (QEMUSoundCard *card) 1836 { 1837 QLIST_REMOVE (card, entries); 1838 g_free (card->name); 1839 } 1840 1841 static struct audio_pcm_ops capture_pcm_ops; 1842 1843 CaptureVoiceOut *AUD_add_capture( 1844 AudioState *s, 1845 struct audsettings *as, 1846 struct audio_capture_ops *ops, 1847 void *cb_opaque 1848 ) 1849 { 1850 CaptureVoiceOut *cap; 1851 struct capture_callback *cb; 1852 1853 if (!s) { 1854 if (!legacy_config) { 1855 dolog("Capturing without setting an audiodev is deprecated\n"); 1856 } 1857 s = audio_init(NULL, NULL); 1858 } 1859 1860 if (!audio_get_pdo_out(s->dev)->mixing_engine) { 1861 dolog("Can't capture with mixeng disabled\n"); 1862 return NULL; 1863 } 1864 1865 if (audio_validate_settings (as)) { 1866 dolog ("Invalid settings were passed when trying to add capture\n"); 1867 audio_print_settings (as); 1868 return NULL; 1869 } 1870 1871 cb = g_malloc0(sizeof(*cb)); 1872 cb->ops = *ops; 1873 cb->opaque = cb_opaque; 1874 1875 cap = audio_pcm_capture_find_specific(s, as); 1876 if (cap) { 1877 QLIST_INSERT_HEAD (&cap->cb_head, cb, entries); 1878 return cap; 1879 } else { 1880 HWVoiceOut *hw; 1881 CaptureVoiceOut *cap; 1882 1883 cap = g_malloc0(sizeof(*cap)); 1884 1885 hw = &cap->hw; 1886 hw->s = s; 1887 hw->pcm_ops = &capture_pcm_ops; 1888 QLIST_INIT (&hw->sw_head); 1889 QLIST_INIT (&cap->cb_head); 1890 1891 /* XXX find a more elegant way */ 1892 hw->samples = 4096 * 4; 1893 audio_pcm_hw_alloc_resources_out(hw); 1894 1895 audio_pcm_init_info (&hw->info, as); 1896 1897 cap->buf = g_malloc0_n(hw->mix_buf->size, hw->info.bytes_per_frame); 1898 1899 if (hw->info.is_float) { 1900 hw->clip = mixeng_clip_float[hw->info.nchannels == 2]; 1901 } else { 1902 hw->clip = mixeng_clip 1903 [hw->info.nchannels == 2] 1904 [hw->info.is_signed] 1905 [hw->info.swap_endianness] 1906 [audio_bits_to_index(hw->info.bits)]; 1907 } 1908 1909 QLIST_INSERT_HEAD (&s->cap_head, cap, entries); 1910 QLIST_INSERT_HEAD (&cap->cb_head, cb, entries); 1911 1912 QLIST_FOREACH(hw, &s->hw_head_out, entries) { 1913 audio_attach_capture (hw); 1914 } 1915 return cap; 1916 } 1917 } 1918 1919 void AUD_del_capture (CaptureVoiceOut *cap, void *cb_opaque) 1920 { 1921 struct capture_callback *cb; 1922 1923 for (cb = cap->cb_head.lh_first; cb; cb = cb->entries.le_next) { 1924 if (cb->opaque == cb_opaque) { 1925 cb->ops.destroy (cb_opaque); 1926 QLIST_REMOVE (cb, entries); 1927 g_free (cb); 1928 1929 if (!cap->cb_head.lh_first) { 1930 SWVoiceOut *sw = cap->hw.sw_head.lh_first, *sw1; 1931 1932 while (sw) { 1933 SWVoiceCap *sc = (SWVoiceCap *) sw; 1934 #ifdef DEBUG_CAPTURE 1935 dolog ("freeing %s\n", sw->name); 1936 #endif 1937 1938 sw1 = sw->entries.le_next; 1939 if (sw->rate) { 1940 st_rate_stop (sw->rate); 1941 sw->rate = NULL; 1942 } 1943 QLIST_REMOVE (sw, entries); 1944 QLIST_REMOVE (sc, entries); 1945 g_free (sc); 1946 sw = sw1; 1947 } 1948 QLIST_REMOVE (cap, entries); 1949 g_free (cap->hw.mix_buf); 1950 g_free (cap->buf); 1951 g_free (cap); 1952 } 1953 return; 1954 } 1955 } 1956 } 1957 1958 void AUD_set_volume_out (SWVoiceOut *sw, int mute, uint8_t lvol, uint8_t rvol) 1959 { 1960 Volume vol = { .mute = mute, .channels = 2, .vol = { lvol, rvol } }; 1961 audio_set_volume_out(sw, &vol); 1962 } 1963 1964 void audio_set_volume_out(SWVoiceOut *sw, Volume *vol) 1965 { 1966 if (sw) { 1967 HWVoiceOut *hw = sw->hw; 1968 1969 sw->vol.mute = vol->mute; 1970 sw->vol.l = nominal_volume.l * vol->vol[0] / 255; 1971 sw->vol.r = nominal_volume.l * vol->vol[vol->channels > 1 ? 1 : 0] / 1972 255; 1973 1974 if (hw->pcm_ops->volume_out) { 1975 hw->pcm_ops->volume_out(hw, vol); 1976 } 1977 } 1978 } 1979 1980 void AUD_set_volume_in (SWVoiceIn *sw, int mute, uint8_t lvol, uint8_t rvol) 1981 { 1982 Volume vol = { .mute = mute, .channels = 2, .vol = { lvol, rvol } }; 1983 audio_set_volume_in(sw, &vol); 1984 } 1985 1986 void audio_set_volume_in(SWVoiceIn *sw, Volume *vol) 1987 { 1988 if (sw) { 1989 HWVoiceIn *hw = sw->hw; 1990 1991 sw->vol.mute = vol->mute; 1992 sw->vol.l = nominal_volume.l * vol->vol[0] / 255; 1993 sw->vol.r = nominal_volume.r * vol->vol[vol->channels > 1 ? 1 : 0] / 1994 255; 1995 1996 if (hw->pcm_ops->volume_in) { 1997 hw->pcm_ops->volume_in(hw, vol); 1998 } 1999 } 2000 } 2001 2002 void audio_create_pdos(Audiodev *dev) 2003 { 2004 switch (dev->driver) { 2005 #define CASE(DRIVER, driver, pdo_name) \ 2006 case AUDIODEV_DRIVER_##DRIVER: \ 2007 if (!dev->u.driver.has_in) { \ 2008 dev->u.driver.in = g_malloc0( \ 2009 sizeof(Audiodev##pdo_name##PerDirectionOptions)); \ 2010 dev->u.driver.has_in = true; \ 2011 } \ 2012 if (!dev->u.driver.has_out) { \ 2013 dev->u.driver.out = g_malloc0( \ 2014 sizeof(Audiodev##pdo_name##PerDirectionOptions)); \ 2015 dev->u.driver.has_out = true; \ 2016 } \ 2017 break 2018 2019 CASE(NONE, none, ); 2020 CASE(ALSA, alsa, Alsa); 2021 CASE(COREAUDIO, coreaudio, Coreaudio); 2022 CASE(DBUS, dbus, ); 2023 CASE(DSOUND, dsound, ); 2024 CASE(JACK, jack, Jack); 2025 CASE(OSS, oss, Oss); 2026 CASE(PA, pa, Pa); 2027 CASE(SDL, sdl, Sdl); 2028 CASE(SPICE, spice, ); 2029 CASE(WAV, wav, ); 2030 2031 case AUDIODEV_DRIVER__MAX: 2032 abort(); 2033 }; 2034 } 2035 2036 static void audio_validate_per_direction_opts( 2037 AudiodevPerDirectionOptions *pdo, Error **errp) 2038 { 2039 if (!pdo->has_mixing_engine) { 2040 pdo->has_mixing_engine = true; 2041 pdo->mixing_engine = true; 2042 } 2043 if (!pdo->has_fixed_settings) { 2044 pdo->has_fixed_settings = true; 2045 pdo->fixed_settings = pdo->mixing_engine; 2046 } 2047 if (!pdo->fixed_settings && 2048 (pdo->has_frequency || pdo->has_channels || pdo->has_format)) { 2049 error_setg(errp, 2050 "You can't use frequency, channels or format with fixed-settings=off"); 2051 return; 2052 } 2053 if (!pdo->mixing_engine && pdo->fixed_settings) { 2054 error_setg(errp, "You can't use fixed-settings without mixeng"); 2055 return; 2056 } 2057 2058 if (!pdo->has_frequency) { 2059 pdo->has_frequency = true; 2060 pdo->frequency = 44100; 2061 } 2062 if (!pdo->has_channels) { 2063 pdo->has_channels = true; 2064 pdo->channels = 2; 2065 } 2066 if (!pdo->has_voices) { 2067 pdo->has_voices = true; 2068 pdo->voices = pdo->mixing_engine ? 1 : INT_MAX; 2069 } 2070 if (!pdo->has_format) { 2071 pdo->has_format = true; 2072 pdo->format = AUDIO_FORMAT_S16; 2073 } 2074 } 2075 2076 static void audio_validate_opts(Audiodev *dev, Error **errp) 2077 { 2078 Error *err = NULL; 2079 2080 audio_create_pdos(dev); 2081 2082 audio_validate_per_direction_opts(audio_get_pdo_in(dev), &err); 2083 if (err) { 2084 error_propagate(errp, err); 2085 return; 2086 } 2087 2088 audio_validate_per_direction_opts(audio_get_pdo_out(dev), &err); 2089 if (err) { 2090 error_propagate(errp, err); 2091 return; 2092 } 2093 2094 if (!dev->has_timer_period) { 2095 dev->has_timer_period = true; 2096 dev->timer_period = 10000; /* 100Hz -> 10ms */ 2097 } 2098 } 2099 2100 void audio_parse_option(const char *opt) 2101 { 2102 Audiodev *dev = NULL; 2103 2104 Visitor *v = qobject_input_visitor_new_str(opt, "driver", &error_fatal); 2105 visit_type_Audiodev(v, NULL, &dev, &error_fatal); 2106 visit_free(v); 2107 2108 audio_define(dev); 2109 } 2110 2111 void audio_define(Audiodev *dev) 2112 { 2113 AudiodevListEntry *e; 2114 2115 audio_validate_opts(dev, &error_fatal); 2116 2117 e = g_new0(AudiodevListEntry, 1); 2118 e->dev = dev; 2119 QSIMPLEQ_INSERT_TAIL(&audiodevs, e, next); 2120 } 2121 2122 void audio_init_audiodevs(void) 2123 { 2124 AudiodevListEntry *e; 2125 2126 QSIMPLEQ_FOREACH(e, &audiodevs, next) { 2127 audio_init(e->dev, NULL); 2128 } 2129 } 2130 2131 audsettings audiodev_to_audsettings(AudiodevPerDirectionOptions *pdo) 2132 { 2133 return (audsettings) { 2134 .freq = pdo->frequency, 2135 .nchannels = pdo->channels, 2136 .fmt = pdo->format, 2137 .endianness = AUDIO_HOST_ENDIANNESS, 2138 }; 2139 } 2140 2141 int audioformat_bytes_per_sample(AudioFormat fmt) 2142 { 2143 switch (fmt) { 2144 case AUDIO_FORMAT_U8: 2145 case AUDIO_FORMAT_S8: 2146 return 1; 2147 2148 case AUDIO_FORMAT_U16: 2149 case AUDIO_FORMAT_S16: 2150 return 2; 2151 2152 case AUDIO_FORMAT_U32: 2153 case AUDIO_FORMAT_S32: 2154 case AUDIO_FORMAT_F32: 2155 return 4; 2156 2157 case AUDIO_FORMAT__MAX: 2158 ; 2159 } 2160 abort(); 2161 } 2162 2163 2164 /* frames = freq * usec / 1e6 */ 2165 int audio_buffer_frames(AudiodevPerDirectionOptions *pdo, 2166 audsettings *as, int def_usecs) 2167 { 2168 uint64_t usecs = pdo->has_buffer_length ? pdo->buffer_length : def_usecs; 2169 return (as->freq * usecs + 500000) / 1000000; 2170 } 2171 2172 /* samples = channels * frames = channels * freq * usec / 1e6 */ 2173 int audio_buffer_samples(AudiodevPerDirectionOptions *pdo, 2174 audsettings *as, int def_usecs) 2175 { 2176 return as->nchannels * audio_buffer_frames(pdo, as, def_usecs); 2177 } 2178 2179 /* 2180 * bytes = bytes_per_sample * samples = 2181 * bytes_per_sample * channels * freq * usec / 1e6 2182 */ 2183 int audio_buffer_bytes(AudiodevPerDirectionOptions *pdo, 2184 audsettings *as, int def_usecs) 2185 { 2186 return audio_buffer_samples(pdo, as, def_usecs) * 2187 audioformat_bytes_per_sample(as->fmt); 2188 } 2189 2190 AudioState *audio_state_by_name(const char *name) 2191 { 2192 AudioState *s; 2193 QTAILQ_FOREACH(s, &audio_states, list) { 2194 assert(s->dev); 2195 if (strcmp(name, s->dev->id) == 0) { 2196 return s; 2197 } 2198 } 2199 return NULL; 2200 } 2201 2202 const char *audio_get_id(QEMUSoundCard *card) 2203 { 2204 if (card->state) { 2205 assert(card->state->dev); 2206 return card->state->dev->id; 2207 } else { 2208 return ""; 2209 } 2210 } 2211 2212 const char *audio_application_name(void) 2213 { 2214 const char *vm_name; 2215 2216 vm_name = qemu_get_vm_name(); 2217 return vm_name ? vm_name : "qemu"; 2218 } 2219 2220 void audio_rate_start(RateCtl *rate) 2221 { 2222 memset(rate, 0, sizeof(RateCtl)); 2223 rate->start_ticks = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 2224 } 2225 2226 size_t audio_rate_get_bytes(struct audio_pcm_info *info, RateCtl *rate, 2227 size_t bytes_avail) 2228 { 2229 int64_t now; 2230 int64_t ticks; 2231 int64_t bytes; 2232 int64_t samples; 2233 size_t ret; 2234 2235 now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL); 2236 ticks = now - rate->start_ticks; 2237 bytes = muldiv64(ticks, info->bytes_per_second, NANOSECONDS_PER_SECOND); 2238 samples = (bytes - rate->bytes_sent) / info->bytes_per_frame; 2239 if (samples < 0 || samples > 65536) { 2240 AUD_log(NULL, "Resetting rate control (%" PRId64 " samples)\n", samples); 2241 audio_rate_start(rate); 2242 samples = 0; 2243 } 2244 2245 ret = MIN(samples * info->bytes_per_frame, bytes_avail); 2246 rate->bytes_sent += ret; 2247 return ret; 2248 } 2249