2 * Audio crossconnecting/conferrencing (hardware level).
4 * Copyright 2002 by Andreas Eversberg (jolly@eversberg.eu)
6 * This software may be used and distributed according to the terms
7 * of the GNU General Public License, incorporated herein by reference.
12 * The process of adding and removing parties to/from a conference:
14 * There is a chain of struct dsp_conf which has one or more members in a chain
15 * of struct dsp_conf_member.
17 * After a party is added, the conference is checked for hardware capability.
18 * Also if a party is removed, the conference is checked again.
20 * There are 3 different solutions: -1 = software, 0 = hardware-crossconnect
21 * 1-n = hardware-conference. The n will give the conference number.
23 * Depending on the change after removal or insertion of a party, hardware
26 * The current solution is stored within the struct dsp_conf entry.
32 * There are 3 types of interaction: One member is alone, in this case only
33 * data flow from upper to lower layer is done.
34 * Two members will also exchange their data so they are crossconnected.
35 * Three or more members will be added in a conference and will hear each
36 * other but will not receive their own speech (echo) if not enabled.
38 * Features of CMX are:
39 * - Crossconnecting or even conference, if more than two members are together.
40 * - Force mixing of transmit data with other crossconnect/conference members.
41 * - Echo generation to benchmark the delay of audio processing.
42 * - Use hardware to minimize cpu load, disable FIFO load and minimize delay.
43 * - Dejittering and clock generation.
45 * There are 2 buffers:
51 * ----------------+-------------+-------------------
53 * The rx-buffer is a ring buffer used to store the received data for each
54 * individual member. This is only the case if data needs to be dejittered
55 * or in case of a conference where different clocks require reclocking.
56 * The transmit-clock (R) will read the buffer.
57 * If the clock overruns the write-pointer, we will have a buffer underrun.
58 * If the write pointer always has a certain distance from the transmit-
59 * clock, we will have a delay. The delay will dynamically be increased and
66 * -----------------+--------+-----------------------
68 * The tx-buffer is a ring buffer to queue the transmit data from user space
69 * until it will be mixed or sent. There are two pointers, R and W. If the write
70 * pointer W would reach or overrun R, the buffer would overrun. In this case
71 * (some) data is dropped so that it will not overrun.
72 * Additionally a dynamic dejittering can be enabled. this allows data from
73 * user space that have jitter and different clock source.
78 * A Clock is not required, if the data source has exactly one clock. In this
79 * case the data source is forwarded to the destination.
81 * A Clock is required, because the data source
82 * - has multiple clocks.
83 * - has no usable clock due to jitter or packet loss (VoIP).
84 * In this case the system's clock is used. The clock resolution depends on
85 * the jiffie resolution.
87 * If a member joins a conference:
89 * - If a member joins, its rx_buff is set to silence and change read pointer
92 * The procedure of received data from card is explained in cmx_receive.
93 * The procedure of received data from user space is explained in cmx_transmit.
94 * The procedure of transmit data to card is cmx_send.
97 * Interaction with other features:
100 * DTMF decoding is done before the data is crossconnected.
103 * Changing rx-volume is done before the data is crossconnected. The tx-volume
104 * must be changed whenever data is transmitted to the card by the cmx.
107 * If a tone is enabled, it will be processed whenever data is transmitted to
108 * the card. It will replace the tx-data from the user space.
109 * If tones are generated by hardware, this conference member is removed for
113 * If cmx is realized in hardware, rx data will be disabled if requested by
114 * the upper layer. If dtmf decoding is done by software and enabled, rx data
115 * will not be diabled but blocked to the upper layer.
117 * HFC conference engine:
118 * If it is possible to realize all features using hardware, hardware will be
119 * used if not forbidden by control command. Disabling rx-data provides
120 * absolutely traffic free audio processing. (except for the quick 1-frame
121 * upload of a tone loop, only once for a new tone)
125 /* delay.h is required for hw_lock.h */
127 #include <linux/delay.h>
128 #include <linux/mISDNif.h>
129 #include <linux/mISDNdsp.h>
133 * debugging of multi party conference,
134 * by using conference even with two members
137 /* #define CMX_CONF_DEBUG */
139 /*#define CMX_DEBUG * massive read/write pointer output */
140 /*#define CMX_TX_DEBUG * massive read/write on tx-buffer with content */
143 count_list_member(struct list_head *head)
148 list_for_each(m, head)
154 * debug cmx memory structure
157 dsp_cmx_debug(struct dsp *dsp)
159 struct dsp_conf *conf;
160 struct dsp_conf_member *member;
163 printk(KERN_DEBUG "-----Current DSP\n");
164 list_for_each_entry(odsp, &dsp_ilist, list) {
165 printk(KERN_DEBUG "* %s echo=%d txmix=%d",
166 odsp->name, odsp->echo, odsp->tx_mix);
168 printk(" (Conf %d)", odsp->conf->id);
173 printk(KERN_DEBUG "-----Current Conf:\n");
174 list_for_each_entry(conf, &conf_ilist, list) {
175 printk(KERN_DEBUG "* Conf %d (%p)\n", conf->id, conf);
176 list_for_each_entry(member, &conf->mlist, list) {
178 " - member = %s (slot_tx %d, bank_tx %d, "
179 "slot_rx %d, bank_rx %d hfc_conf %d)%s\n",
180 member->dsp->name, member->dsp->pcm_slot_tx,
181 member->dsp->pcm_bank_tx, member->dsp->pcm_slot_rx,
182 member->dsp->pcm_bank_rx, member->dsp->hfc_conf,
183 (member->dsp == dsp) ? " *this*" : "");
186 printk(KERN_DEBUG "-----end\n");
192 static struct dsp_conf *
193 dsp_cmx_search_conf(u32 id)
195 struct dsp_conf *conf;
198 printk(KERN_WARNING "%s: conference ID is 0.\n", __func__);
202 /* search conference */
203 list_for_each_entry(conf, &conf_ilist, list)
212 * add member to conference
215 dsp_cmx_add_conf_member(struct dsp *dsp, struct dsp_conf *conf)
217 struct dsp_conf_member *member;
220 printk(KERN_WARNING "%s: conf or dsp is 0.\n", __func__);
224 printk(KERN_WARNING "%s: dsp is already member in a conf.\n",
230 printk(KERN_WARNING "%s: dsp is already in a conf.\n",
235 member = kzalloc(sizeof(struct dsp_conf_member), GFP_ATOMIC);
237 printk(KERN_ERR "kmalloc struct dsp_conf_member failed\n");
241 /* clear rx buffer */
242 memset(dsp->rx_buff, dsp_silence, sizeof(dsp->rx_buff));
243 dsp->rx_init = 1; /* rx_W and rx_R will be adjusted on first frame */
247 list_add_tail(&member->list, &conf->mlist);
250 dsp->member = member;
257 * del member from conference
260 dsp_cmx_del_conf_member(struct dsp *dsp)
262 struct dsp_conf_member *member;
265 printk(KERN_WARNING "%s: dsp is 0.\n",
271 printk(KERN_WARNING "%s: dsp is not in a conf.\n",
276 if (list_empty(&dsp->conf->mlist)) {
277 printk(KERN_WARNING "%s: dsp has linked an empty conf.\n",
282 /* find us in conf */
283 list_for_each_entry(member, &dsp->conf->mlist, list) {
284 if (member->dsp == dsp) {
285 list_del(&member->list);
293 "%s: dsp is not present in its own conf_meber list.\n",
303 static struct dsp_conf
304 *dsp_cmx_new_conf(u32 id)
306 struct dsp_conf *conf;
309 printk(KERN_WARNING "%s: id is 0.\n",
314 conf = kzalloc(sizeof(struct dsp_conf), GFP_ATOMIC);
316 printk(KERN_ERR "kmalloc struct dsp_conf failed\n");
319 INIT_LIST_HEAD(&conf->mlist);
322 list_add_tail(&conf->list, &conf_ilist);
332 dsp_cmx_del_conf(struct dsp_conf *conf)
335 printk(KERN_WARNING "%s: conf is null.\n",
340 if (!list_empty(&conf->mlist)) {
341 printk(KERN_WARNING "%s: conf not empty.\n",
345 list_del(&conf->list);
353 * send HW message to hfc card
356 dsp_cmx_hw_message(struct dsp *dsp, u32 message, u32 param1, u32 param2,
357 u32 param3, u32 param4)
359 struct mISDN_ctrl_req cq;
361 memset(&cq, 0, sizeof(cq));
363 cq.p1 = param1 | (param2 << 8);
364 cq.p2 = param3 | (param4 << 8);
366 dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq);
371 * do hardware update and set the software/hardware flag
373 * either a conference or a dsp instance can be given
374 * if only dsp instance is given, the instance is not associated with a conf
375 * and therefore removed. if a conference is given, the dsp is expected to
376 * be member of that conference.
379 dsp_cmx_hardware(struct dsp_conf *conf, struct dsp *dsp)
381 struct dsp_conf_member *member, *nextm;
383 int memb = 0, i, ii, i1, i2;
385 u_char freeslots[256];
386 int same_hfc = -1, same_pcm = -1, current_conf = -1,
389 /* dsp gets updated (no conf) */
393 if (dsp_debug & DEBUG_DSP_CMX)
394 printk(KERN_DEBUG "%s checking dsp %s\n",
395 __func__, dsp->name);
397 /* remove HFC conference if enabled */
398 if (dsp->hfc_conf >= 0) {
399 if (dsp_debug & DEBUG_DSP_CMX)
401 "%s removing %s from HFC conf %d "
402 "because dsp is split\n", __func__,
403 dsp->name, dsp->hfc_conf);
404 dsp_cmx_hw_message(dsp, MISDN_CTRL_HFC_CONF_SPLIT,
408 /* process hw echo */
409 if (dsp->features.pcm_banks < 1)
412 /* NO ECHO: remove PCM slot if assigned */
413 if (dsp->pcm_slot_tx >= 0 || dsp->pcm_slot_rx >= 0) {
414 if (dsp_debug & DEBUG_DSP_CMX)
415 printk(KERN_DEBUG "%s removing %s from"
416 " PCM slot %d (TX) %d (RX) because"
417 " dsp is split (no echo)\n",
419 dsp->pcm_slot_tx, dsp->pcm_slot_rx);
420 dsp_cmx_hw_message(dsp, MISDN_CTRL_HFC_PCM_DISC,
422 dsp->pcm_slot_tx = -1;
423 dsp->pcm_bank_tx = -1;
424 dsp->pcm_slot_rx = -1;
425 dsp->pcm_bank_rx = -1;
429 /* ECHO: already echo */
430 if (dsp->pcm_slot_tx >= 0 && dsp->pcm_slot_rx < 0 &&
431 dsp->pcm_bank_tx == 2 && dsp->pcm_bank_rx == 2)
433 /* ECHO: if slot already assigned */
434 if (dsp->pcm_slot_tx >= 0) {
435 dsp->pcm_slot_rx = dsp->pcm_slot_tx;
436 dsp->pcm_bank_tx = 2; /* 2 means loop */
437 dsp->pcm_bank_rx = 2;
438 if (dsp_debug & DEBUG_DSP_CMX)
440 "%s refresh %s for echo using slot %d\n",
443 dsp_cmx_hw_message(dsp, MISDN_CTRL_HFC_PCM_CONN,
444 dsp->pcm_slot_tx, 2, dsp->pcm_slot_rx, 2);
447 /* ECHO: find slot */
448 dsp->pcm_slot_tx = -1;
449 dsp->pcm_slot_rx = -1;
450 memset(freeslots, 1, sizeof(freeslots));
451 list_for_each_entry(finddsp, &dsp_ilist, list) {
452 if (finddsp->features.pcm_id == dsp->features.pcm_id) {
453 if (finddsp->pcm_slot_rx >= 0 &&
454 finddsp->pcm_slot_rx < sizeof(freeslots))
455 freeslots[finddsp->pcm_slot_rx] = 0;
456 if (finddsp->pcm_slot_tx >= 0 &&
457 finddsp->pcm_slot_tx < sizeof(freeslots))
458 freeslots[finddsp->pcm_slot_tx] = 0;
462 ii = dsp->features.pcm_slots;
469 if (dsp_debug & DEBUG_DSP_CMX)
471 "%s no slot available for echo\n",
473 /* no more slots available */
476 /* assign free slot */
477 dsp->pcm_slot_tx = i;
478 dsp->pcm_slot_rx = i;
479 dsp->pcm_bank_tx = 2; /* loop */
480 dsp->pcm_bank_rx = 2;
481 if (dsp_debug & DEBUG_DSP_CMX)
483 "%s assign echo for %s using slot %d\n",
484 __func__, dsp->name, dsp->pcm_slot_tx);
485 dsp_cmx_hw_message(dsp, MISDN_CTRL_HFC_PCM_CONN,
486 dsp->pcm_slot_tx, 2, dsp->pcm_slot_rx, 2);
490 /* conf gets updated (all members) */
491 if (dsp_debug & DEBUG_DSP_CMX)
492 printk(KERN_DEBUG "%s checking conference %d\n",
495 if (list_empty(&conf->mlist)) {
496 printk(KERN_ERR "%s: conference whithout members\n",
500 member = list_entry(conf->mlist.next, struct dsp_conf_member, list);
501 same_hfc = member->dsp->features.hfc_id;
502 same_pcm = member->dsp->features.pcm_id;
503 /* check all members in our conference */
504 list_for_each_entry(member, &conf->mlist, list) {
505 /* check if member uses mixing */
506 if (member->dsp->tx_mix) {
507 if (dsp_debug & DEBUG_DSP_CMX)
509 "%s dsp %s cannot form a conf, because "
510 "tx_mix is turned on\n", __func__,
513 list_for_each_entry(member, &conf->mlist, list) {
515 /* remove HFC conference if enabled */
516 if (dsp->hfc_conf >= 0) {
517 if (dsp_debug & DEBUG_DSP_CMX)
519 "%s removing %s from HFC "
520 "conf %d because not "
521 "possible with hardware\n",
525 dsp_cmx_hw_message(dsp,
526 MISDN_CTRL_HFC_CONF_SPLIT,
530 /* remove PCM slot if assigned */
531 if (dsp->pcm_slot_tx >= 0 ||
532 dsp->pcm_slot_rx >= 0) {
533 if (dsp_debug & DEBUG_DSP_CMX)
534 printk(KERN_DEBUG "%s removing "
535 "%s from PCM slot %d (TX)"
536 " slot %d (RX) because not"
537 " possible with hardware\n",
542 dsp_cmx_hw_message(dsp,
543 MISDN_CTRL_HFC_PCM_DISC,
545 dsp->pcm_slot_tx = -1;
546 dsp->pcm_bank_tx = -1;
547 dsp->pcm_slot_rx = -1;
548 dsp->pcm_bank_rx = -1;
555 /* check if member has echo turned on */
556 if (member->dsp->echo) {
557 if (dsp_debug & DEBUG_DSP_CMX)
559 "%s dsp %s cannot form a conf, because "
560 "echo is turned on\n", __func__,
564 /* check if member has tx_mix turned on */
565 if (member->dsp->tx_mix) {
566 if (dsp_debug & DEBUG_DSP_CMX)
568 "%s dsp %s cannot form a conf, because "
569 "tx_mix is turned on\n",
570 __func__, member->dsp->name);
573 /* check if member changes volume at an not suppoted level */
574 if (member->dsp->tx_volume) {
575 if (dsp_debug & DEBUG_DSP_CMX)
577 "%s dsp %s cannot form a conf, because "
578 "tx_volume is changed\n",
579 __func__, member->dsp->name);
582 if (member->dsp->rx_volume) {
583 if (dsp_debug & DEBUG_DSP_CMX)
585 "%s dsp %s cannot form a conf, because "
586 "rx_volume is changed\n",
587 __func__, member->dsp->name);
590 /* check if tx-data turned on */
591 if (member->dsp->tx_data) {
592 if (dsp_debug & DEBUG_DSP_CMX)
594 "%s dsp %s cannot form a conf, because "
595 "tx_data is turned on\n",
596 __func__, member->dsp->name);
599 /* check if pipeline exists */
600 if (member->dsp->pipeline.inuse) {
601 if (dsp_debug & DEBUG_DSP_CMX)
603 "%s dsp %s cannot form a conf, because "
604 "pipeline exists\n", __func__,
608 /* check if encryption is enabled */
609 if (member->dsp->bf_enable) {
610 if (dsp_debug & DEBUG_DSP_CMX)
611 printk(KERN_DEBUG "%s dsp %s cannot form a "
612 "conf, because encryption is enabled\n",
613 __func__, member->dsp->name);
616 /* check if member is on a card with PCM support */
617 if (member->dsp->features.pcm_id < 0) {
618 if (dsp_debug & DEBUG_DSP_CMX)
620 "%s dsp %s cannot form a conf, because "
621 "dsp has no PCM bus\n",
622 __func__, member->dsp->name);
625 /* check if relations are on the same PCM bus */
626 if (member->dsp->features.pcm_id != same_pcm) {
627 if (dsp_debug & DEBUG_DSP_CMX)
629 "%s dsp %s cannot form a conf, because "
630 "dsp is on a different PCM bus than the "
632 __func__, member->dsp->name);
635 /* determine if members are on the same hfc chip */
636 if (same_hfc != member->dsp->features.hfc_id)
638 /* if there are members already in a conference */
639 if (current_conf < 0 && member->dsp->hfc_conf >= 0)
640 current_conf = member->dsp->hfc_conf;
641 /* if any member is not in a conference */
642 if (member->dsp->hfc_conf < 0)
648 /* if no member, this is an error */
654 if (dsp_debug & DEBUG_DSP_CMX)
656 "%s conf %d cannot form a HW conference, "
657 "because dsp is alone\n", __func__, conf->id);
660 member = list_entry(conf->mlist.next, struct dsp_conf_member,
667 * ok, now we are sure that all members are on the same pcm.
668 * now we will see if we have only two members, so we can do
669 * crossconnections, which don't have any limitations.
672 /* if we have only two members */
674 member = list_entry(conf->mlist.next, struct dsp_conf_member,
676 nextm = list_entry(member->list.next, struct dsp_conf_member,
678 /* remove HFC conference if enabled */
679 if (member->dsp->hfc_conf >= 0) {
680 if (dsp_debug & DEBUG_DSP_CMX)
682 "%s removing %s from HFC conf %d because "
683 "two parties require only a PCM slot\n",
684 __func__, member->dsp->name,
685 member->dsp->hfc_conf);
686 dsp_cmx_hw_message(member->dsp,
687 MISDN_CTRL_HFC_CONF_SPLIT, 0, 0, 0, 0);
688 member->dsp->hfc_conf = -1;
690 if (nextm->dsp->hfc_conf >= 0) {
691 if (dsp_debug & DEBUG_DSP_CMX)
693 "%s removing %s from HFC conf %d because "
694 "two parties require only a PCM slot\n",
695 __func__, nextm->dsp->name,
696 nextm->dsp->hfc_conf);
697 dsp_cmx_hw_message(nextm->dsp,
698 MISDN_CTRL_HFC_CONF_SPLIT, 0, 0, 0, 0);
699 nextm->dsp->hfc_conf = -1;
701 /* if members have two banks (and not on the same chip) */
702 if (member->dsp->features.pcm_banks > 1 &&
703 nextm->dsp->features.pcm_banks > 1 &&
704 member->dsp->features.hfc_id !=
705 nextm->dsp->features.hfc_id) {
706 /* if both members have same slots with crossed banks */
707 if (member->dsp->pcm_slot_tx >= 0 &&
708 member->dsp->pcm_slot_rx >= 0 &&
709 nextm->dsp->pcm_slot_tx >= 0 &&
710 nextm->dsp->pcm_slot_rx >= 0 &&
711 nextm->dsp->pcm_slot_tx ==
712 member->dsp->pcm_slot_rx &&
713 nextm->dsp->pcm_slot_rx ==
714 member->dsp->pcm_slot_tx &&
715 nextm->dsp->pcm_slot_tx ==
716 member->dsp->pcm_slot_tx &&
717 member->dsp->pcm_bank_tx !=
718 member->dsp->pcm_bank_rx &&
719 nextm->dsp->pcm_bank_tx !=
720 nextm->dsp->pcm_bank_rx) {
721 /* all members have same slot */
722 if (dsp_debug & DEBUG_DSP_CMX)
724 "%s dsp %s & %s stay joined on "
725 "PCM slot %d bank %d (TX) bank %d "
726 "(RX) (on different chips)\n",
730 member->dsp->pcm_slot_tx,
731 member->dsp->pcm_bank_tx,
732 member->dsp->pcm_bank_rx);
737 /* find a new slot */
738 memset(freeslots, 1, sizeof(freeslots));
739 list_for_each_entry(dsp, &dsp_ilist, list) {
740 if (dsp != member->dsp &&
742 member->dsp->features.pcm_id ==
743 dsp->features.pcm_id) {
744 if (dsp->pcm_slot_rx >= 0 &&
747 freeslots[dsp->pcm_slot_tx] = 0;
748 if (dsp->pcm_slot_tx >= 0 &&
751 freeslots[dsp->pcm_slot_rx] = 0;
755 ii = member->dsp->features.pcm_slots;
762 if (dsp_debug & DEBUG_DSP_CMX)
764 "%s no slot available for "
765 "%s & %s\n", __func__,
768 /* no more slots available */
771 /* assign free slot */
772 member->dsp->pcm_slot_tx = i;
773 member->dsp->pcm_slot_rx = i;
774 nextm->dsp->pcm_slot_tx = i;
775 nextm->dsp->pcm_slot_rx = i;
776 member->dsp->pcm_bank_rx = 0;
777 member->dsp->pcm_bank_tx = 1;
778 nextm->dsp->pcm_bank_rx = 1;
779 nextm->dsp->pcm_bank_tx = 0;
780 if (dsp_debug & DEBUG_DSP_CMX)
782 "%s adding %s & %s to new PCM slot %d "
783 "(TX and RX on different chips) because "
784 "both members have not same slots\n",
788 member->dsp->pcm_slot_tx);
789 dsp_cmx_hw_message(member->dsp, MISDN_CTRL_HFC_PCM_CONN,
790 member->dsp->pcm_slot_tx, member->dsp->pcm_bank_tx,
791 member->dsp->pcm_slot_rx, member->dsp->pcm_bank_rx);
792 dsp_cmx_hw_message(nextm->dsp, MISDN_CTRL_HFC_PCM_CONN,
793 nextm->dsp->pcm_slot_tx, nextm->dsp->pcm_bank_tx,
794 nextm->dsp->pcm_slot_rx, nextm->dsp->pcm_bank_rx);
798 /* if members have one bank (or on the same chip) */
800 /* if both members have different crossed slots */
801 if (member->dsp->pcm_slot_tx >= 0 &&
802 member->dsp->pcm_slot_rx >= 0 &&
803 nextm->dsp->pcm_slot_tx >= 0 &&
804 nextm->dsp->pcm_slot_rx >= 0 &&
805 nextm->dsp->pcm_slot_tx ==
806 member->dsp->pcm_slot_rx &&
807 nextm->dsp->pcm_slot_rx ==
808 member->dsp->pcm_slot_tx &&
809 member->dsp->pcm_slot_tx !=
810 member->dsp->pcm_slot_rx &&
811 member->dsp->pcm_bank_tx == 0 &&
812 member->dsp->pcm_bank_rx == 0 &&
813 nextm->dsp->pcm_bank_tx == 0 &&
814 nextm->dsp->pcm_bank_rx == 0) {
815 /* all members have same slot */
816 if (dsp_debug & DEBUG_DSP_CMX)
818 "%s dsp %s & %s stay joined on PCM "
819 "slot %d (TX) %d (RX) on same chip "
820 "or one bank PCM)\n", __func__,
823 member->dsp->pcm_slot_tx,
824 member->dsp->pcm_slot_rx);
829 /* find two new slot */
830 memset(freeslots, 1, sizeof(freeslots));
831 list_for_each_entry(dsp, &dsp_ilist, list) {
832 if (dsp != member->dsp &&
834 member->dsp->features.pcm_id ==
835 dsp->features.pcm_id) {
836 if (dsp->pcm_slot_rx >= 0 &&
839 freeslots[dsp->pcm_slot_tx] = 0;
840 if (dsp->pcm_slot_tx >= 0 &&
843 freeslots[dsp->pcm_slot_rx] = 0;
847 ii = member->dsp->features.pcm_slots;
854 if (dsp_debug & DEBUG_DSP_CMX)
856 "%s no slot available "
857 "for %s & %s\n", __func__,
860 /* no more slots available */
870 if (dsp_debug & DEBUG_DSP_CMX)
872 "%s no slot available "
877 /* no more slots available */
880 /* assign free slots */
881 member->dsp->pcm_slot_tx = i1;
882 member->dsp->pcm_slot_rx = i2;
883 nextm->dsp->pcm_slot_tx = i2;
884 nextm->dsp->pcm_slot_rx = i1;
885 member->dsp->pcm_bank_rx = 0;
886 member->dsp->pcm_bank_tx = 0;
887 nextm->dsp->pcm_bank_rx = 0;
888 nextm->dsp->pcm_bank_tx = 0;
889 if (dsp_debug & DEBUG_DSP_CMX)
891 "%s adding %s & %s to new PCM slot %d "
892 "(TX) %d (RX) on same chip or one bank "
893 "PCM, because both members have not "
894 "crossed slots\n", __func__,
897 member->dsp->pcm_slot_tx,
898 member->dsp->pcm_slot_rx);
899 dsp_cmx_hw_message(member->dsp, MISDN_CTRL_HFC_PCM_CONN,
900 member->dsp->pcm_slot_tx, member->dsp->pcm_bank_tx,
901 member->dsp->pcm_slot_rx, member->dsp->pcm_bank_rx);
902 dsp_cmx_hw_message(nextm->dsp, MISDN_CTRL_HFC_PCM_CONN,
903 nextm->dsp->pcm_slot_tx, nextm->dsp->pcm_bank_tx,
904 nextm->dsp->pcm_slot_rx, nextm->dsp->pcm_bank_rx);
912 * if we have more than two, we may check if we have a conference
913 * unit available on the chip. also all members must be on the same
916 /* if not the same HFC chip */
918 if (dsp_debug & DEBUG_DSP_CMX)
920 "%s conference %d cannot be formed, because "
921 "members are on different chips or not "
927 /* for more than two members.. */
929 /* in case of hdlc, we change to software */
933 /* if all members already have the same conference */
938 * if there is an existing conference, but not all members have joined
940 if (current_conf >= 0) {
942 list_for_each_entry(member, &conf->mlist, list) {
943 /* join to current conference */
944 if (member->dsp->hfc_conf == current_conf)
946 /* get a free timeslot first */
947 memset(freeslots, 1, sizeof(freeslots));
948 list_for_each_entry(dsp, &dsp_ilist, list) {
950 * not checking current member, because
951 * slot will be overwritten.
954 dsp != member->dsp &&
955 /* dsp must be on the same PCM */
956 member->dsp->features.pcm_id ==
957 dsp->features.pcm_id) {
958 /* dsp must be on a slot */
959 if (dsp->pcm_slot_tx >= 0 &&
962 freeslots[dsp->pcm_slot_tx] = 0;
963 if (dsp->pcm_slot_rx >= 0 &&
966 freeslots[dsp->pcm_slot_rx] = 0;
970 ii = member->dsp->features.pcm_slots;
977 /* no more slots available */
978 if (dsp_debug & DEBUG_DSP_CMX)
980 "%s conference %d cannot be formed,"
981 " because no slot free\n",
985 if (dsp_debug & DEBUG_DSP_CMX)
987 "%s changing dsp %s to HW conference "
988 "%d slot %d\n", __func__,
989 member->dsp->name, current_conf, i);
990 /* assign free slot & set PCM & join conf */
991 member->dsp->pcm_slot_tx = i;
992 member->dsp->pcm_slot_rx = i;
993 member->dsp->pcm_bank_tx = 2; /* loop */
994 member->dsp->pcm_bank_rx = 2;
995 member->dsp->hfc_conf = current_conf;
996 dsp_cmx_hw_message(member->dsp, MISDN_CTRL_HFC_PCM_CONN,
998 dsp_cmx_hw_message(member->dsp,
999 MISDN_CTRL_HFC_CONF_JOIN, current_conf, 0, 0, 0);
1005 * no member is in a conference yet, so we find a free one
1007 memset(freeunits, 1, sizeof(freeunits));
1008 list_for_each_entry(dsp, &dsp_ilist, list) {
1009 /* dsp must be on the same chip */
1010 if (dsp->features.hfc_id == same_hfc &&
1011 /* dsp must have joined a HW conference */
1012 dsp->hfc_conf >= 0 &&
1013 /* slot must be within range */
1015 freeunits[dsp->hfc_conf] = 0;
1025 /* no more conferences available */
1026 if (dsp_debug & DEBUG_DSP_CMX)
1028 "%s conference %d cannot be formed, because "
1029 "no conference number free\n",
1030 __func__, conf->id);
1033 /* join all members */
1040 * conf_id != 0: join or change conference
1041 * conf_id == 0: split from conference if not already
1044 dsp_cmx_conf(struct dsp *dsp, u32 conf_id)
1047 struct dsp_conf *conf;
1048 struct dsp_conf_member *member;
1050 /* if conference doesn't change */
1051 if (dsp->conf_id == conf_id)
1054 /* first remove us from current conf */
1056 if (dsp_debug & DEBUG_DSP_CMX)
1057 printk(KERN_DEBUG "removing us from conference %d\n",
1059 /* remove us from conf */
1061 err = dsp_cmx_del_conf_member(dsp);
1066 /* update hardware */
1067 dsp_cmx_hardware(NULL, dsp);
1069 /* conf now empty? */
1070 if (list_empty(&conf->mlist)) {
1071 if (dsp_debug & DEBUG_DSP_CMX)
1073 "conference is empty, so we remove it.\n");
1074 err = dsp_cmx_del_conf(conf);
1078 /* update members left on conf */
1079 dsp_cmx_hardware(conf, NULL);
1087 /* now add us to conf */
1088 if (dsp_debug & DEBUG_DSP_CMX)
1089 printk(KERN_DEBUG "searching conference %d\n",
1091 conf = dsp_cmx_search_conf(conf_id);
1093 if (dsp_debug & DEBUG_DSP_CMX)
1095 "conference doesn't exist yet, creating.\n");
1096 /* the conference doesn't exist, so we create */
1097 conf = dsp_cmx_new_conf(conf_id);
1100 } else if (!list_empty(&conf->mlist)) {
1101 member = list_entry(conf->mlist.next, struct dsp_conf_member,
1103 if (dsp->hdlc && !member->dsp->hdlc) {
1104 if (dsp_debug & DEBUG_DSP_CMX)
1106 "cannot join transparent conference.\n");
1109 if (!dsp->hdlc && member->dsp->hdlc) {
1110 if (dsp_debug & DEBUG_DSP_CMX)
1112 "cannot join hdlc conference.\n");
1116 /* add conference member */
1117 err = dsp_cmx_add_conf_member(dsp, conf);
1120 dsp->conf_id = conf_id;
1122 /* if we are alone, we do nothing! */
1123 if (list_empty(&conf->mlist)) {
1124 if (dsp_debug & DEBUG_DSP_CMX)
1126 "we are alone in this conference, so exit.\n");
1127 /* update hardware */
1128 dsp_cmx_hardware(NULL, dsp);
1132 /* update members on conf */
1133 dsp_cmx_hardware(conf, NULL);
1140 * audio data is received from card
1143 dsp_cmx_receive(struct dsp *dsp, struct sk_buff *skb)
1147 struct mISDNhead *hh = mISDN_HEAD_P(skb);
1150 /* check if we have sompen */
1154 /* half of the buffer should be larger than maximum packet size */
1155 if (len >= CMX_BUFF_HALF) {
1157 "%s line %d: packet from card is too large (%d bytes). "
1158 "please make card send smaller packets OR increase "
1159 "CMX_BUFF_SIZE\n", __FILE__, __LINE__, len);
1164 * initialize pointers if not already -
1165 * also add delay if requested by PH_SIGNAL
1169 if (dsp->features.unordered) {
1170 dsp->rx_R = (hh->id & CMX_BUFF_MASK);
1171 dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
1175 dsp->rx_W = dsp->cmx_delay;
1178 /* if frame contains time code, write directly */
1179 if (dsp->features.unordered) {
1180 dsp->rx_W = (hh->id & CMX_BUFF_MASK);
1181 /* printk(KERN_DEBUG "%s %08x\n", dsp->name, hh->id); */
1184 * if we underrun (or maybe overrun),
1185 * we set our new read pointer, and write silence to buffer
1187 if (((dsp->rx_W-dsp->rx_R) & CMX_BUFF_MASK) >= CMX_BUFF_HALF) {
1188 if (dsp_debug & DEBUG_DSP_CMX)
1190 "cmx_receive(dsp=%lx): UNDERRUN (or overrun the "
1191 "maximum delay), adjusting read pointer! "
1192 "(inst %s)\n", (u_long)dsp, dsp->name);
1194 if (dsp->features.unordered) {
1195 dsp->rx_R = (hh->id & CMX_BUFF_MASK);
1196 dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
1200 dsp->rx_W = dsp->cmx_delay;
1202 memset(dsp->rx_buff, dsp_silence, sizeof(dsp->rx_buff));
1204 /* if we have reached double delay, jump back to middle */
1206 if (((dsp->rx_W - dsp->rx_R) & CMX_BUFF_MASK) >=
1207 (dsp->cmx_delay << 1)) {
1208 if (dsp_debug & DEBUG_DSP_CMX)
1210 "cmx_receive(dsp=%lx): OVERRUN (because "
1211 "twice the delay is reached), adjusting "
1212 "read pointer! (inst %s)\n",
1213 (u_long)dsp, dsp->name);
1215 if (dsp->features.unordered) {
1216 dsp->rx_R = (hh->id & CMX_BUFF_MASK);
1217 dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
1221 dsp->rx_W = dsp->cmx_delay;
1223 memset(dsp->rx_buff, dsp_silence, sizeof(dsp->rx_buff));
1226 /* show where to write */
1229 "cmx_receive(dsp=%lx): rx_R(dsp)=%05x rx_W(dsp)=%05x len=%d %s\n",
1230 (u_long)dsp, dsp->rx_R, dsp->rx_W, len, dsp->name);
1233 /* write data into rx_buffer */
1240 d[w++ & CMX_BUFF_MASK] = *p++;
1244 /* increase write-pointer */
1245 dsp->rx_W = ((dsp->rx_W+len) & CMX_BUFF_MASK);
1250 * send (mixed) audio data to card and control jitter
1253 dsp_cmx_send_member(struct dsp *dsp, int len, s32 *c, int members)
1255 struct dsp_conf *conf = dsp->conf;
1256 struct dsp *member, *other;
1257 register s32 sample;
1258 u8 *d, *p, *q, *o_q;
1259 struct sk_buff *nskb, *txskb;
1260 int r, rr, t, tt, o_r, o_rr;
1262 struct mISDNhead *hh, *thh;
1264 /* don't process if: */
1265 if (!dsp->b_active) { /* if not active */
1269 if (dsp->pcm_slot_tx >= 0 && /* connected to pcm slot */
1270 dsp->tx_R == dsp->tx_W && /* AND no tx-data */
1271 !(dsp->tone.tone && dsp->tone.software)) { /* AND not soft tones */
1278 "SEND members=%d dsp=%s, conf=%p, rx_R=%05x rx_W=%05x\n",
1279 members, dsp->name, conf, dsp->rx_R, dsp->rx_W);
1282 /* preload if we have delay set */
1283 if (dsp->cmx_delay && !dsp->last_tx) {
1289 /* PREPARE RESULT */
1290 nskb = mI_alloc_skb(len + preload, GFP_ATOMIC);
1293 "FATAL ERROR in mISDN_dsp.o: cannot alloc %d bytes\n",
1297 hh = mISDN_HEAD_P(nskb);
1298 hh->prim = PH_DATA_REQ;
1302 /* set pointers, indexes and stuff */
1304 p = dsp->tx_buff; /* transmit data */
1305 q = dsp->rx_buff; /* received data */
1306 d = skb_put(nskb, preload + len); /* result */
1307 t = dsp->tx_R; /* tx-pointers */
1309 r = dsp->rx_R; /* rx-pointers */
1310 rr = (r + len) & CMX_BUFF_MASK;
1312 /* preload with silence, if required */
1314 memset(d, dsp_silence, preload);
1318 /* PROCESS TONES/TX-DATA ONLY */
1319 if (dsp->tone.tone && dsp->tone.software) {
1321 dsp_tone_copy(dsp, d, len);
1322 dsp->tx_R = 0; /* clear tx buffer */
1326 /* if we have tx-data but do not use mixing */
1327 if (!dsp->tx_mix && t != tt) {
1328 /* -> send tx-data and continue when not enough */
1330 sprintf(debugbuf, "TX sending (%04x-%04x)%p: ", t, tt, p);
1332 while (r != rr && t != tt) {
1334 if (strlen(debugbuf) < 48)
1335 sprintf(debugbuf+strlen(debugbuf), " %02x", p[t]);
1337 *d++ = p[t]; /* write tx_buff */
1338 t = (t+1) & CMX_BUFF_MASK;
1339 r = (r+1) & CMX_BUFF_MASK;
1344 printk(KERN_DEBUG "%s\n", debugbuf);
1350 printk(KERN_DEBUG "%s\n", debugbuf);
1353 /* PROCESS DATA (one member / no conf) */
1354 if (!conf || members <= 1) {
1355 /* -> if echo is NOT enabled */
1357 /* -> send tx-data if available or use 0-volume */
1358 while (r != rr && t != tt) {
1359 *d++ = p[t]; /* write tx_buff */
1360 t = (t+1) & CMX_BUFF_MASK;
1361 r = (r+1) & CMX_BUFF_MASK;
1364 memset(d, dsp_silence, (rr-r)&CMX_BUFF_MASK);
1365 /* -> if echo is enabled */
1368 * -> mix tx-data with echo if available,
1371 while (r != rr && t != tt) {
1372 *d++ = dsp_audio_mix_law[(p[t]<<8)|q[r]];
1373 t = (t+1) & CMX_BUFF_MASK;
1374 r = (r+1) & CMX_BUFF_MASK;
1377 *d++ = q[r]; /* echo */
1378 r = (r+1) & CMX_BUFF_MASK;
1384 /* PROCESS DATA (two members) */
1385 #ifdef CMX_CONF_DEBUG
1390 /* "other" becomes other party */
1391 other = (list_entry(conf->mlist.next,
1392 struct dsp_conf_member, list))->dsp;
1393 if (other == member)
1394 other = (list_entry(conf->mlist.prev,
1395 struct dsp_conf_member, list))->dsp;
1396 o_q = other->rx_buff; /* received data */
1397 o_rr = (other->rx_R + len) & CMX_BUFF_MASK;
1398 /* end of rx-pointer */
1399 o_r = (o_rr - rr + r) & CMX_BUFF_MASK;
1400 /* start rx-pointer at current read position*/
1401 /* -> if echo is NOT enabled */
1404 * -> copy other member's rx-data,
1405 * if tx-data is available, mix
1407 while (o_r != o_rr && t != tt) {
1408 *d++ = dsp_audio_mix_law[(p[t]<<8)|o_q[o_r]];
1409 t = (t+1) & CMX_BUFF_MASK;
1410 o_r = (o_r+1) & CMX_BUFF_MASK;
1412 while (o_r != o_rr) {
1414 o_r = (o_r+1) & CMX_BUFF_MASK;
1416 /* -> if echo is enabled */
1419 * -> mix other member's rx-data with echo,
1420 * if tx-data is available, mix
1422 while (r != rr && t != tt) {
1423 sample = dsp_audio_law_to_s32[p[t]] +
1424 dsp_audio_law_to_s32[q[r]] +
1425 dsp_audio_law_to_s32[o_q[o_r]];
1426 if (sample < -32768)
1428 else if (sample > 32767)
1430 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1431 /* tx-data + rx_data + echo */
1432 t = (t+1) & CMX_BUFF_MASK;
1433 r = (r+1) & CMX_BUFF_MASK;
1434 o_r = (o_r+1) & CMX_BUFF_MASK;
1437 *d++ = dsp_audio_mix_law[(q[r]<<8)|o_q[o_r]];
1438 r = (r+1) & CMX_BUFF_MASK;
1439 o_r = (o_r+1) & CMX_BUFF_MASK;
1445 #ifdef DSP_NEVER_DEFINED
1448 /* PROCESS DATA (three or more members) */
1449 /* -> if echo is NOT enabled */
1452 * -> substract rx-data from conf-data,
1453 * if tx-data is available, mix
1455 while (r != rr && t != tt) {
1456 sample = dsp_audio_law_to_s32[p[t]] + *c++ -
1457 dsp_audio_law_to_s32[q[r]];
1458 if (sample < -32768)
1460 else if (sample > 32767)
1462 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1464 r = (r+1) & CMX_BUFF_MASK;
1465 t = (t+1) & CMX_BUFF_MASK;
1468 sample = *c++ - dsp_audio_law_to_s32[q[r]];
1469 if (sample < -32768)
1471 else if (sample > 32767)
1473 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1475 r = (r+1) & CMX_BUFF_MASK;
1477 /* -> if echo is enabled */
1480 * -> encode conf-data, if tx-data
1483 while (r != rr && t != tt) {
1484 sample = dsp_audio_law_to_s32[p[t]] + *c++;
1485 if (sample < -32768)
1487 else if (sample > 32767)
1489 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1491 t = (t+1) & CMX_BUFF_MASK;
1492 r = (r+1) & CMX_BUFF_MASK;
1496 if (sample < -32768)
1498 else if (sample > 32767)
1500 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1502 r = (r+1) & CMX_BUFF_MASK;
1510 * send tx-data if enabled - don't filter,
1511 * becuase we want what we send, not what we filtered
1514 /* PREPARE RESULT */
1515 txskb = mI_alloc_skb(len, GFP_ATOMIC);
1518 "FATAL ERROR in mISDN_dsp.o: "
1519 "cannot alloc %d bytes\n", len);
1521 thh = mISDN_HEAD_P(txskb);
1522 thh->prim = DL_DATA_REQ;
1524 memcpy(skb_put(txskb, len), nskb->data+preload, len);
1525 /* queue (trigger later) */
1526 skb_queue_tail(&dsp->sendq, txskb);
1531 dsp_change_volume(nskb, dsp->tx_volume);
1533 if (dsp->pipeline.inuse)
1534 dsp_pipeline_process_tx(&dsp->pipeline, nskb->data, nskb->len);
1537 dsp_bf_encrypt(dsp, nskb->data, nskb->len);
1538 /* queue and trigger */
1539 skb_queue_tail(&dsp->sendq, nskb);
1540 schedule_work(&dsp->workq);
1543 static u32 samplecount;
1544 struct timer_list dsp_spl_tl;
1545 u32 dsp_spl_jiffies; /* calculate the next time to fire */
1547 static u32 dsp_start_jiffies; /* jiffies at the time, the calculation begins */
1549 static struct timeval dsp_start_tv; /* time at start of calculation */
1552 dsp_cmx_send(void *arg)
1554 struct dsp_conf *conf;
1555 struct dsp_conf_member *member;
1557 int mustmix, members;
1558 s32 mixbuffer[MAX_POLL+100], *c;
1561 int jittercheck = 0, delay, i;
1568 spin_lock_irqsave(&dsp_lock, flags);
1570 if (!dsp_start_tv.tv_sec) {
1571 do_gettimeofday(&dsp_start_tv);
1574 do_gettimeofday(&tv);
1575 elapsed = ((tv.tv_sec - dsp_start_tv.tv_sec) * 8000)
1576 + ((s32)(tv.tv_usec / 125) - (dsp_start_tv.tv_usec / 125));
1577 dsp_start_tv.tv_sec = tv.tv_sec;
1578 dsp_start_tv.tv_usec = tv.tv_usec;
1581 if (length > MAX_POLL + 100)
1582 length = MAX_POLL + 100;
1583 /* printk(KERN_DEBUG "len=%d dsp_count=0x%x.%04x dsp_poll_diff=0x%x.%04x\n",
1584 length, dsp_count >> 16, dsp_count & 0xffff, dsp_poll_diff >> 16,
1585 dsp_poll_diff & 0xffff);
1589 * check if jitter needs to be checked
1590 * (this is about every second = 8192 samples)
1592 samplecount += length;
1593 if ((samplecount & 8191) < length)
1596 /* loop all members that do not require conference mixing */
1597 list_for_each_entry(dsp, &dsp_ilist, list) {
1604 members = count_list_member(&conf->mlist);
1605 #ifdef CMX_CONF_DEBUG
1606 if (conf->software && members > 1)
1608 if (conf->software && members > 2)
1613 /* transmission required */
1615 dsp_cmx_send_member(dsp, length, mixbuffer, members);
1618 * unused mixbuffer is given to prevent a
1619 * potential null-pointer-bug
1624 /* loop all members that require conference mixing */
1625 list_for_each_entry(conf, &conf_ilist, list) {
1626 /* count members and check hardware */
1627 members = count_list_member(&conf->mlist);
1628 #ifdef CMX_CONF_DEBUG
1629 if (conf->software && members > 1) {
1631 if (conf->software && members > 2) {
1633 /* check for hdlc conf */
1634 member = list_entry(conf->mlist.next,
1635 struct dsp_conf_member, list);
1636 if (member->dsp->hdlc)
1639 memset(mixbuffer, 0, length*sizeof(s32));
1640 list_for_each_entry(member, &conf->mlist, list) {
1642 /* get range of data to mix */
1646 rr = (r + length) & CMX_BUFF_MASK;
1647 /* add member's data */
1649 *c++ += dsp_audio_law_to_s32[q[r]];
1650 r = (r+1) & CMX_BUFF_MASK;
1654 /* process each member */
1655 list_for_each_entry(member, &conf->mlist, list) {
1657 dsp_cmx_send_member(member->dsp, length,
1658 mixbuffer, members);
1663 /* delete rx-data, increment buffers, change pointers */
1664 list_for_each_entry(dsp, &dsp_ilist, list) {
1670 /* move receive pointer when receiving */
1671 if (!dsp->rx_is_off) {
1672 rr = (r + length) & CMX_BUFF_MASK;
1673 /* delete rx-data */
1676 r = (r+1) & CMX_BUFF_MASK;
1678 /* increment rx-buffer pointer */
1679 dsp->rx_R = r; /* write incremented read pointer */
1682 /* check current rx_delay */
1683 delay = (dsp->rx_W-dsp->rx_R) & CMX_BUFF_MASK;
1684 if (delay >= CMX_BUFF_HALF)
1685 delay = 0; /* will be the delay before next write */
1686 /* check for lower delay */
1687 if (delay < dsp->rx_delay[0])
1688 dsp->rx_delay[0] = delay;
1689 /* check current tx_delay */
1690 delay = (dsp->tx_W-dsp->tx_R) & CMX_BUFF_MASK;
1691 if (delay >= CMX_BUFF_HALF)
1692 delay = 0; /* will be the delay before next write */
1693 /* check for lower delay */
1694 if (delay < dsp->tx_delay[0])
1695 dsp->tx_delay[0] = delay;
1697 /* find the lowest of all rx_delays */
1698 delay = dsp->rx_delay[0];
1700 while (i < MAX_SECONDS_JITTER_CHECK) {
1701 if (delay > dsp->rx_delay[i])
1702 delay = dsp->rx_delay[i];
1706 * remove rx_delay only if we have delay AND we
1707 * have not preset cmx_delay
1709 if (delay && !dsp->cmx_delay) {
1710 if (dsp_debug & DEBUG_DSP_CMX)
1712 "%s lowest rx_delay of %d bytes for"
1713 " dsp %s are now removed.\n",
1717 rr = (r + delay) & CMX_BUFF_MASK;
1718 /* delete rx-data */
1721 r = (r+1) & CMX_BUFF_MASK;
1723 /* increment rx-buffer pointer */
1725 /* write incremented read pointer */
1727 /* find the lowest of all tx_delays */
1728 delay = dsp->tx_delay[0];
1730 while (i < MAX_SECONDS_JITTER_CHECK) {
1731 if (delay > dsp->tx_delay[i])
1732 delay = dsp->tx_delay[i];
1736 * remove delay only if we have delay AND we
1737 * have enabled tx_dejitter
1739 if (delay && dsp->tx_dejitter) {
1740 if (dsp_debug & DEBUG_DSP_CMX)
1742 "%s lowest tx_delay of %d bytes for"
1743 " dsp %s are now removed.\n",
1747 rr = (r + delay) & CMX_BUFF_MASK;
1748 /* delete tx-data */
1751 r = (r+1) & CMX_BUFF_MASK;
1753 /* increment rx-buffer pointer */
1755 /* write incremented read pointer */
1757 /* scroll up delays */
1758 i = MAX_SECONDS_JITTER_CHECK - 1;
1760 dsp->rx_delay[i] = dsp->rx_delay[i-1];
1761 dsp->tx_delay[i] = dsp->tx_delay[i-1];
1764 dsp->tx_delay[0] = CMX_BUFF_HALF; /* (infinite) delay */
1765 dsp->rx_delay[0] = CMX_BUFF_HALF; /* (infinite) delay */
1769 /* if next event would be in the past ... */
1770 if ((s32)(dsp_spl_jiffies+dsp_tics-jiffies) <= 0)
1771 dsp_spl_jiffies = jiffies + 1;
1773 dsp_spl_jiffies += dsp_tics;
1775 dsp_spl_tl.expires = dsp_spl_jiffies;
1776 add_timer(&dsp_spl_tl);
1779 spin_unlock_irqrestore(&dsp_lock, flags);
1783 * audio data is transmitted from upper layer to the dsp
1786 dsp_cmx_transmit(struct dsp *dsp, struct sk_buff *skb)
1790 int space; /* todo: , l = skb->len; */
1792 char debugbuf[256] = "";
1795 /* check if there is enough space, and then copy */
1802 space += CMX_BUFF_SIZE;
1803 /* write-pointer should not overrun nor reach read pointer */
1804 if (space-1 < skb->len)
1805 /* write to the space we have left */
1806 ww = (ww - 1) & CMX_BUFF_MASK;
1808 /* write until all byte are copied */
1809 ww = (w + skb->len) & CMX_BUFF_MASK;
1812 /* show current buffer */
1815 "cmx_transmit(dsp=%lx) %d bytes to 0x%x-0x%x. %s\n",
1816 (u_long)dsp, (ww-w)&CMX_BUFF_MASK, w, ww, dsp->name);
1819 /* copy transmit data to tx-buffer */
1821 sprintf(debugbuf, "TX getting (%04x-%04x)%p: ", w, ww, p);
1825 if (strlen(debugbuf) < 48)
1826 sprintf(debugbuf+strlen(debugbuf), " %02x", *d);
1829 w = (w+1) & CMX_BUFF_MASK;
1832 printk(KERN_DEBUG "%s\n", debugbuf);
1838 * hdlc data is received from card and sent to all members.
1841 dsp_cmx_hdlc(struct dsp *dsp, struct sk_buff *skb)
1843 struct sk_buff *nskb = NULL;
1844 struct dsp_conf_member *member;
1845 struct mISDNhead *hh;
1847 /* not if not active */
1851 /* check if we have sompen */
1857 /* in case of hardware (echo) */
1858 if (dsp->pcm_slot_tx >= 0)
1861 nskb = skb_clone(skb, GFP_ATOMIC);
1863 hh = mISDN_HEAD_P(nskb);
1864 hh->prim = PH_DATA_REQ;
1866 skb_queue_tail(&dsp->sendq, nskb);
1867 schedule_work(&dsp->workq);
1871 /* in case of hardware conference */
1872 if (dsp->conf->hardware)
1874 list_for_each_entry(member, &dsp->conf->mlist, list) {
1875 if (dsp->echo || member->dsp != dsp) {
1876 nskb = skb_clone(skb, GFP_ATOMIC);
1878 hh = mISDN_HEAD_P(nskb);
1879 hh->prim = PH_DATA_REQ;
1881 skb_queue_tail(&member->dsp->sendq, nskb);
1882 schedule_work(&member->dsp->workq);