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_DELAY_DEBUG * gives rx-buffer delay overview */
141 /*#define CMX_TX_DEBUG * massive read/write on tx-buffer with content */
144 count_list_member(struct list_head *head)
149 list_for_each(m, head)
155 * debug cmx memory structure
158 dsp_cmx_debug(struct dsp *dsp)
160 struct dsp_conf *conf;
161 struct dsp_conf_member *member;
164 printk(KERN_DEBUG "-----Current DSP\n");
165 list_for_each_entry(odsp, &dsp_ilist, list) {
166 printk(KERN_DEBUG "* %s echo=%d txmix=%d",
167 odsp->name, odsp->echo, odsp->tx_mix);
169 printk(" (Conf %d)", odsp->conf->id);
174 printk(KERN_DEBUG "-----Current Conf:\n");
175 list_for_each_entry(conf, &conf_ilist, list) {
176 printk(KERN_DEBUG "* Conf %d (%p)\n", conf->id, conf);
177 list_for_each_entry(member, &conf->mlist, list) {
179 " - member = %s (slot_tx %d, bank_tx %d, "
180 "slot_rx %d, bank_rx %d hfc_conf %d)%s\n",
181 member->dsp->name, member->dsp->pcm_slot_tx,
182 member->dsp->pcm_bank_tx, member->dsp->pcm_slot_rx,
183 member->dsp->pcm_bank_rx, member->dsp->hfc_conf,
184 (member->dsp == dsp) ? " *this*" : "");
187 printk(KERN_DEBUG "-----end\n");
193 static struct dsp_conf *
194 dsp_cmx_search_conf(u32 id)
196 struct dsp_conf *conf;
199 printk(KERN_WARNING "%s: conference ID is 0.\n", __func__);
203 /* search conference */
204 list_for_each_entry(conf, &conf_ilist, list)
213 * add member to conference
216 dsp_cmx_add_conf_member(struct dsp *dsp, struct dsp_conf *conf)
218 struct dsp_conf_member *member;
221 printk(KERN_WARNING "%s: conf or dsp is 0.\n", __func__);
225 printk(KERN_WARNING "%s: dsp is already member in a conf.\n",
231 printk(KERN_WARNING "%s: dsp is already in a conf.\n",
236 member = kzalloc(sizeof(struct dsp_conf_member), GFP_ATOMIC);
238 printk(KERN_ERR "kmalloc struct dsp_conf_member failed\n");
242 /* clear rx buffer */
243 memset(dsp->rx_buff, dsp_silence, sizeof(dsp->rx_buff));
244 dsp->rx_init = 1; /* rx_W and rx_R will be adjusted on first frame */
248 list_add_tail(&member->list, &conf->mlist);
251 dsp->member = member;
258 * del member from conference
261 dsp_cmx_del_conf_member(struct dsp *dsp)
263 struct dsp_conf_member *member;
266 printk(KERN_WARNING "%s: dsp is 0.\n",
272 printk(KERN_WARNING "%s: dsp is not in a conf.\n",
277 if (list_empty(&dsp->conf->mlist)) {
278 printk(KERN_WARNING "%s: dsp has linked an empty conf.\n",
283 /* find us in conf */
284 list_for_each_entry(member, &dsp->conf->mlist, list) {
285 if (member->dsp == dsp) {
286 list_del(&member->list);
294 "%s: dsp is not present in its own conf_meber list.\n",
304 static struct dsp_conf
305 *dsp_cmx_new_conf(u32 id)
307 struct dsp_conf *conf;
310 printk(KERN_WARNING "%s: id is 0.\n",
315 conf = kzalloc(sizeof(struct dsp_conf), GFP_ATOMIC);
317 printk(KERN_ERR "kmalloc struct dsp_conf failed\n");
320 INIT_LIST_HEAD(&conf->mlist);
323 list_add_tail(&conf->list, &conf_ilist);
333 dsp_cmx_del_conf(struct dsp_conf *conf)
336 printk(KERN_WARNING "%s: conf is null.\n",
341 if (!list_empty(&conf->mlist)) {
342 printk(KERN_WARNING "%s: conf not empty.\n",
346 list_del(&conf->list);
354 * send HW message to hfc card
357 dsp_cmx_hw_message(struct dsp *dsp, u32 message, u32 param1, u32 param2,
358 u32 param3, u32 param4)
360 struct mISDN_ctrl_req cq;
362 memset(&cq, 0, sizeof(cq));
364 cq.p1 = param1 | (param2 << 8);
365 cq.p2 = param3 | (param4 << 8);
367 dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq);
372 * do hardware update and set the software/hardware flag
374 * either a conference or a dsp instance can be given
375 * if only dsp instance is given, the instance is not associated with a conf
376 * and therefore removed. if a conference is given, the dsp is expected to
377 * be member of that conference.
380 dsp_cmx_hardware(struct dsp_conf *conf, struct dsp *dsp)
382 struct dsp_conf_member *member, *nextm;
384 int memb = 0, i, ii, i1, i2;
386 u_char freeslots[256];
387 int same_hfc = -1, same_pcm = -1, current_conf = -1,
390 /* dsp gets updated (no conf) */
394 if (dsp_debug & DEBUG_DSP_CMX)
395 printk(KERN_DEBUG "%s checking dsp %s\n",
396 __func__, dsp->name);
398 /* remove HFC conference if enabled */
399 if (dsp->hfc_conf >= 0) {
400 if (dsp_debug & DEBUG_DSP_CMX)
402 "%s removing %s from HFC conf %d "
403 "because dsp is split\n", __func__,
404 dsp->name, dsp->hfc_conf);
405 dsp_cmx_hw_message(dsp, MISDN_CTRL_HFC_CONF_SPLIT,
409 /* process hw echo */
410 if (dsp->features.pcm_banks < 1)
413 /* NO ECHO: remove PCM slot if assigned */
414 if (dsp->pcm_slot_tx >= 0 || dsp->pcm_slot_rx >= 0) {
415 if (dsp_debug & DEBUG_DSP_CMX)
416 printk(KERN_DEBUG "%s removing %s from"
417 " PCM slot %d (TX) %d (RX) because"
418 " dsp is split (no echo)\n",
420 dsp->pcm_slot_tx, dsp->pcm_slot_rx);
421 dsp_cmx_hw_message(dsp, MISDN_CTRL_HFC_PCM_DISC,
423 dsp->pcm_slot_tx = -1;
424 dsp->pcm_bank_tx = -1;
425 dsp->pcm_slot_rx = -1;
426 dsp->pcm_bank_rx = -1;
430 /* ECHO: already echo */
431 if (dsp->pcm_slot_tx >= 0 && dsp->pcm_slot_rx < 0 &&
432 dsp->pcm_bank_tx == 2 && dsp->pcm_bank_rx == 2)
434 /* ECHO: if slot already assigned */
435 if (dsp->pcm_slot_tx >= 0) {
436 dsp->pcm_slot_rx = dsp->pcm_slot_tx;
437 dsp->pcm_bank_tx = 2; /* 2 means loop */
438 dsp->pcm_bank_rx = 2;
439 if (dsp_debug & DEBUG_DSP_CMX)
441 "%s refresh %s for echo using slot %d\n",
444 dsp_cmx_hw_message(dsp, MISDN_CTRL_HFC_PCM_CONN,
445 dsp->pcm_slot_tx, 2, dsp->pcm_slot_rx, 2);
448 /* ECHO: find slot */
449 dsp->pcm_slot_tx = -1;
450 dsp->pcm_slot_rx = -1;
451 memset(freeslots, 1, sizeof(freeslots));
452 list_for_each_entry(finddsp, &dsp_ilist, list) {
453 if (finddsp->features.pcm_id == dsp->features.pcm_id) {
454 if (finddsp->pcm_slot_rx >= 0 &&
455 finddsp->pcm_slot_rx < sizeof(freeslots))
456 freeslots[finddsp->pcm_slot_rx] = 0;
457 if (finddsp->pcm_slot_tx >= 0 &&
458 finddsp->pcm_slot_tx < sizeof(freeslots))
459 freeslots[finddsp->pcm_slot_tx] = 0;
463 ii = dsp->features.pcm_slots;
470 if (dsp_debug & DEBUG_DSP_CMX)
472 "%s no slot available for echo\n",
474 /* no more slots available */
477 /* assign free slot */
478 dsp->pcm_slot_tx = i;
479 dsp->pcm_slot_rx = i;
480 dsp->pcm_bank_tx = 2; /* loop */
481 dsp->pcm_bank_rx = 2;
482 if (dsp_debug & DEBUG_DSP_CMX)
484 "%s assign echo for %s using slot %d\n",
485 __func__, dsp->name, dsp->pcm_slot_tx);
486 dsp_cmx_hw_message(dsp, MISDN_CTRL_HFC_PCM_CONN,
487 dsp->pcm_slot_tx, 2, dsp->pcm_slot_rx, 2);
491 /* conf gets updated (all members) */
492 if (dsp_debug & DEBUG_DSP_CMX)
493 printk(KERN_DEBUG "%s checking conference %d\n",
496 if (list_empty(&conf->mlist)) {
497 printk(KERN_ERR "%s: conference whithout members\n",
501 member = list_entry(conf->mlist.next, struct dsp_conf_member, list);
502 same_hfc = member->dsp->features.hfc_id;
503 same_pcm = member->dsp->features.pcm_id;
504 /* check all members in our conference */
505 list_for_each_entry(member, &conf->mlist, list) {
506 /* check if member uses mixing */
507 if (member->dsp->tx_mix) {
508 if (dsp_debug & DEBUG_DSP_CMX)
510 "%s dsp %s cannot form a conf, because "
511 "tx_mix is turned on\n", __func__,
514 list_for_each_entry(member, &conf->mlist, list) {
516 /* remove HFC conference if enabled */
517 if (dsp->hfc_conf >= 0) {
518 if (dsp_debug & DEBUG_DSP_CMX)
520 "%s removing %s from HFC "
521 "conf %d because not "
522 "possible with hardware\n",
526 dsp_cmx_hw_message(dsp,
527 MISDN_CTRL_HFC_CONF_SPLIT,
531 /* remove PCM slot if assigned */
532 if (dsp->pcm_slot_tx >= 0 ||
533 dsp->pcm_slot_rx >= 0) {
534 if (dsp_debug & DEBUG_DSP_CMX)
535 printk(KERN_DEBUG "%s removing "
536 "%s from PCM slot %d (TX)"
537 " slot %d (RX) because not"
538 " possible with hardware\n",
543 dsp_cmx_hw_message(dsp,
544 MISDN_CTRL_HFC_PCM_DISC,
546 dsp->pcm_slot_tx = -1;
547 dsp->pcm_bank_tx = -1;
548 dsp->pcm_slot_rx = -1;
549 dsp->pcm_bank_rx = -1;
556 /* check if member has echo turned on */
557 if (member->dsp->echo) {
558 if (dsp_debug & DEBUG_DSP_CMX)
560 "%s dsp %s cannot form a conf, because "
561 "echo is turned on\n", __func__,
565 /* check if member has tx_mix turned on */
566 if (member->dsp->tx_mix) {
567 if (dsp_debug & DEBUG_DSP_CMX)
569 "%s dsp %s cannot form a conf, because "
570 "tx_mix is turned on\n",
571 __func__, member->dsp->name);
574 /* check if member changes volume at an not suppoted level */
575 if (member->dsp->tx_volume) {
576 if (dsp_debug & DEBUG_DSP_CMX)
578 "%s dsp %s cannot form a conf, because "
579 "tx_volume is changed\n",
580 __func__, member->dsp->name);
583 if (member->dsp->rx_volume) {
584 if (dsp_debug & DEBUG_DSP_CMX)
586 "%s dsp %s cannot form a conf, because "
587 "rx_volume is changed\n",
588 __func__, member->dsp->name);
591 /* check if tx-data turned on */
592 if (member->dsp->tx_data) {
593 if (dsp_debug & DEBUG_DSP_CMX)
595 "%s dsp %s cannot form a conf, because "
596 "tx_data is turned on\n",
597 __func__, member->dsp->name);
600 /* check if pipeline exists */
601 if (member->dsp->pipeline.inuse) {
602 if (dsp_debug & DEBUG_DSP_CMX)
604 "%s dsp %s cannot form a conf, because "
605 "pipeline exists\n", __func__,
609 /* check if encryption is enabled */
610 if (member->dsp->bf_enable) {
611 if (dsp_debug & DEBUG_DSP_CMX)
612 printk(KERN_DEBUG "%s dsp %s cannot form a "
613 "conf, because encryption is enabled\n",
614 __func__, member->dsp->name);
617 /* check if member is on a card with PCM support */
618 if (member->dsp->features.pcm_id < 0) {
619 if (dsp_debug & DEBUG_DSP_CMX)
621 "%s dsp %s cannot form a conf, because "
622 "dsp has no PCM bus\n",
623 __func__, member->dsp->name);
626 /* check if relations are on the same PCM bus */
627 if (member->dsp->features.pcm_id != same_pcm) {
628 if (dsp_debug & DEBUG_DSP_CMX)
630 "%s dsp %s cannot form a conf, because "
631 "dsp is on a different PCM bus than the "
633 __func__, member->dsp->name);
636 /* determine if members are on the same hfc chip */
637 if (same_hfc != member->dsp->features.hfc_id)
639 /* if there are members already in a conference */
640 if (current_conf < 0 && member->dsp->hfc_conf >= 0)
641 current_conf = member->dsp->hfc_conf;
642 /* if any member is not in a conference */
643 if (member->dsp->hfc_conf < 0)
649 /* if no member, this is an error */
655 if (dsp_debug & DEBUG_DSP_CMX)
657 "%s conf %d cannot form a HW conference, "
658 "because dsp is alone\n", __func__, conf->id);
661 member = list_entry(conf->mlist.next, struct dsp_conf_member,
668 * ok, now we are sure that all members are on the same pcm.
669 * now we will see if we have only two members, so we can do
670 * crossconnections, which don't have any limitations.
673 /* if we have only two members */
675 member = list_entry(conf->mlist.next, struct dsp_conf_member,
677 nextm = list_entry(member->list.next, struct dsp_conf_member,
679 /* remove HFC conference if enabled */
680 if (member->dsp->hfc_conf >= 0) {
681 if (dsp_debug & DEBUG_DSP_CMX)
683 "%s removing %s from HFC conf %d because "
684 "two parties require only a PCM slot\n",
685 __func__, member->dsp->name,
686 member->dsp->hfc_conf);
687 dsp_cmx_hw_message(member->dsp,
688 MISDN_CTRL_HFC_CONF_SPLIT, 0, 0, 0, 0);
689 member->dsp->hfc_conf = -1;
691 if (nextm->dsp->hfc_conf >= 0) {
692 if (dsp_debug & DEBUG_DSP_CMX)
694 "%s removing %s from HFC conf %d because "
695 "two parties require only a PCM slot\n",
696 __func__, nextm->dsp->name,
697 nextm->dsp->hfc_conf);
698 dsp_cmx_hw_message(nextm->dsp,
699 MISDN_CTRL_HFC_CONF_SPLIT, 0, 0, 0, 0);
700 nextm->dsp->hfc_conf = -1;
702 /* if members have two banks (and not on the same chip) */
703 if (member->dsp->features.pcm_banks > 1 &&
704 nextm->dsp->features.pcm_banks > 1 &&
705 member->dsp->features.hfc_id !=
706 nextm->dsp->features.hfc_id) {
707 /* if both members have same slots with crossed banks */
708 if (member->dsp->pcm_slot_tx >= 0 &&
709 member->dsp->pcm_slot_rx >= 0 &&
710 nextm->dsp->pcm_slot_tx >= 0 &&
711 nextm->dsp->pcm_slot_rx >= 0 &&
712 nextm->dsp->pcm_slot_tx ==
713 member->dsp->pcm_slot_rx &&
714 nextm->dsp->pcm_slot_rx ==
715 member->dsp->pcm_slot_tx &&
716 nextm->dsp->pcm_slot_tx ==
717 member->dsp->pcm_slot_tx &&
718 member->dsp->pcm_bank_tx !=
719 member->dsp->pcm_bank_rx &&
720 nextm->dsp->pcm_bank_tx !=
721 nextm->dsp->pcm_bank_rx) {
722 /* all members have same slot */
723 if (dsp_debug & DEBUG_DSP_CMX)
725 "%s dsp %s & %s stay joined on "
726 "PCM slot %d bank %d (TX) bank %d "
727 "(RX) (on different chips)\n",
731 member->dsp->pcm_slot_tx,
732 member->dsp->pcm_bank_tx,
733 member->dsp->pcm_bank_rx);
738 /* find a new slot */
739 memset(freeslots, 1, sizeof(freeslots));
740 list_for_each_entry(dsp, &dsp_ilist, list) {
741 if (dsp != member->dsp &&
743 member->dsp->features.pcm_id ==
744 dsp->features.pcm_id) {
745 if (dsp->pcm_slot_rx >= 0 &&
748 freeslots[dsp->pcm_slot_rx] = 0;
749 if (dsp->pcm_slot_tx >= 0 &&
752 freeslots[dsp->pcm_slot_tx] = 0;
756 ii = member->dsp->features.pcm_slots;
763 if (dsp_debug & DEBUG_DSP_CMX)
765 "%s no slot available for "
766 "%s & %s\n", __func__,
769 /* no more slots available */
772 /* assign free slot */
773 member->dsp->pcm_slot_tx = i;
774 member->dsp->pcm_slot_rx = i;
775 nextm->dsp->pcm_slot_tx = i;
776 nextm->dsp->pcm_slot_rx = i;
777 member->dsp->pcm_bank_rx = 0;
778 member->dsp->pcm_bank_tx = 1;
779 nextm->dsp->pcm_bank_rx = 1;
780 nextm->dsp->pcm_bank_tx = 0;
781 if (dsp_debug & DEBUG_DSP_CMX)
783 "%s adding %s & %s to new PCM slot %d "
784 "(TX and RX on different chips) because "
785 "both members have not same slots\n",
789 member->dsp->pcm_slot_tx);
790 dsp_cmx_hw_message(member->dsp, MISDN_CTRL_HFC_PCM_CONN,
791 member->dsp->pcm_slot_tx, member->dsp->pcm_bank_tx,
792 member->dsp->pcm_slot_rx, member->dsp->pcm_bank_rx);
793 dsp_cmx_hw_message(nextm->dsp, MISDN_CTRL_HFC_PCM_CONN,
794 nextm->dsp->pcm_slot_tx, nextm->dsp->pcm_bank_tx,
795 nextm->dsp->pcm_slot_rx, nextm->dsp->pcm_bank_rx);
799 /* if members have one bank (or on the same chip) */
801 /* if both members have different crossed slots */
802 if (member->dsp->pcm_slot_tx >= 0 &&
803 member->dsp->pcm_slot_rx >= 0 &&
804 nextm->dsp->pcm_slot_tx >= 0 &&
805 nextm->dsp->pcm_slot_rx >= 0 &&
806 nextm->dsp->pcm_slot_tx ==
807 member->dsp->pcm_slot_rx &&
808 nextm->dsp->pcm_slot_rx ==
809 member->dsp->pcm_slot_tx &&
810 member->dsp->pcm_slot_tx !=
811 member->dsp->pcm_slot_rx &&
812 member->dsp->pcm_bank_tx == 0 &&
813 member->dsp->pcm_bank_rx == 0 &&
814 nextm->dsp->pcm_bank_tx == 0 &&
815 nextm->dsp->pcm_bank_rx == 0) {
816 /* all members have same slot */
817 if (dsp_debug & DEBUG_DSP_CMX)
819 "%s dsp %s & %s stay joined on PCM "
820 "slot %d (TX) %d (RX) on same chip "
821 "or one bank PCM)\n", __func__,
824 member->dsp->pcm_slot_tx,
825 member->dsp->pcm_slot_rx);
830 /* find two new slot */
831 memset(freeslots, 1, sizeof(freeslots));
832 list_for_each_entry(dsp, &dsp_ilist, list) {
833 if (dsp != member->dsp &&
835 member->dsp->features.pcm_id ==
836 dsp->features.pcm_id) {
837 if (dsp->pcm_slot_rx >= 0 &&
840 freeslots[dsp->pcm_slot_rx] = 0;
841 if (dsp->pcm_slot_tx >= 0 &&
844 freeslots[dsp->pcm_slot_tx] = 0;
848 ii = member->dsp->features.pcm_slots;
855 if (dsp_debug & DEBUG_DSP_CMX)
857 "%s no slot available "
858 "for %s & %s\n", __func__,
861 /* no more slots available */
871 if (dsp_debug & DEBUG_DSP_CMX)
873 "%s no slot available "
878 /* no more slots available */
881 /* assign free slots */
882 member->dsp->pcm_slot_tx = i1;
883 member->dsp->pcm_slot_rx = i2;
884 nextm->dsp->pcm_slot_tx = i2;
885 nextm->dsp->pcm_slot_rx = i1;
886 member->dsp->pcm_bank_rx = 0;
887 member->dsp->pcm_bank_tx = 0;
888 nextm->dsp->pcm_bank_rx = 0;
889 nextm->dsp->pcm_bank_tx = 0;
890 if (dsp_debug & DEBUG_DSP_CMX)
892 "%s adding %s & %s to new PCM slot %d "
893 "(TX) %d (RX) on same chip or one bank "
894 "PCM, because both members have not "
895 "crossed slots\n", __func__,
898 member->dsp->pcm_slot_tx,
899 member->dsp->pcm_slot_rx);
900 dsp_cmx_hw_message(member->dsp, MISDN_CTRL_HFC_PCM_CONN,
901 member->dsp->pcm_slot_tx, member->dsp->pcm_bank_tx,
902 member->dsp->pcm_slot_rx, member->dsp->pcm_bank_rx);
903 dsp_cmx_hw_message(nextm->dsp, MISDN_CTRL_HFC_PCM_CONN,
904 nextm->dsp->pcm_slot_tx, nextm->dsp->pcm_bank_tx,
905 nextm->dsp->pcm_slot_rx, nextm->dsp->pcm_bank_rx);
913 * if we have more than two, we may check if we have a conference
914 * unit available on the chip. also all members must be on the same
917 /* if not the same HFC chip */
919 if (dsp_debug & DEBUG_DSP_CMX)
921 "%s conference %d cannot be formed, because "
922 "members are on different chips or not "
928 /* for more than two members.. */
930 /* in case of hdlc, we change to software */
934 /* if all members already have the same conference */
939 * if there is an existing conference, but not all members have joined
941 if (current_conf >= 0) {
943 list_for_each_entry(member, &conf->mlist, list) {
944 /* join to current conference */
945 if (member->dsp->hfc_conf == current_conf)
947 /* get a free timeslot first */
948 memset(freeslots, 1, sizeof(freeslots));
949 list_for_each_entry(dsp, &dsp_ilist, list) {
951 * not checking current member, because
952 * slot will be overwritten.
955 dsp != member->dsp &&
956 /* dsp must be on the same PCM */
957 member->dsp->features.pcm_id ==
958 dsp->features.pcm_id) {
959 /* dsp must be on a slot */
960 if (dsp->pcm_slot_tx >= 0 &&
963 freeslots[dsp->pcm_slot_tx] = 0;
964 if (dsp->pcm_slot_rx >= 0 &&
967 freeslots[dsp->pcm_slot_rx] = 0;
971 ii = member->dsp->features.pcm_slots;
978 /* no more slots available */
979 if (dsp_debug & DEBUG_DSP_CMX)
981 "%s conference %d cannot be formed,"
982 " because no slot free\n",
986 if (dsp_debug & DEBUG_DSP_CMX)
988 "%s changing dsp %s to HW conference "
989 "%d slot %d\n", __func__,
990 member->dsp->name, current_conf, i);
991 /* assign free slot & set PCM & join conf */
992 member->dsp->pcm_slot_tx = i;
993 member->dsp->pcm_slot_rx = i;
994 member->dsp->pcm_bank_tx = 2; /* loop */
995 member->dsp->pcm_bank_rx = 2;
996 member->dsp->hfc_conf = current_conf;
997 dsp_cmx_hw_message(member->dsp, MISDN_CTRL_HFC_PCM_CONN,
999 dsp_cmx_hw_message(member->dsp,
1000 MISDN_CTRL_HFC_CONF_JOIN, current_conf, 0, 0, 0);
1006 * no member is in a conference yet, so we find a free one
1008 memset(freeunits, 1, sizeof(freeunits));
1009 list_for_each_entry(dsp, &dsp_ilist, list) {
1010 /* dsp must be on the same chip */
1011 if (dsp->features.hfc_id == same_hfc &&
1012 /* dsp must have joined a HW conference */
1013 dsp->hfc_conf >= 0 &&
1014 /* slot must be within range */
1016 freeunits[dsp->hfc_conf] = 0;
1026 /* no more conferences available */
1027 if (dsp_debug & DEBUG_DSP_CMX)
1029 "%s conference %d cannot be formed, because "
1030 "no conference number free\n",
1031 __func__, conf->id);
1034 /* join all members */
1041 * conf_id != 0: join or change conference
1042 * conf_id == 0: split from conference if not already
1045 dsp_cmx_conf(struct dsp *dsp, u32 conf_id)
1048 struct dsp_conf *conf;
1049 struct dsp_conf_member *member;
1051 /* if conference doesn't change */
1052 if (dsp->conf_id == conf_id)
1055 /* first remove us from current conf */
1057 if (dsp_debug & DEBUG_DSP_CMX)
1058 printk(KERN_DEBUG "removing us from conference %d\n",
1060 /* remove us from conf */
1062 err = dsp_cmx_del_conf_member(dsp);
1067 /* update hardware */
1068 dsp_cmx_hardware(NULL, dsp);
1070 /* conf now empty? */
1071 if (list_empty(&conf->mlist)) {
1072 if (dsp_debug & DEBUG_DSP_CMX)
1074 "conference is empty, so we remove it.\n");
1075 err = dsp_cmx_del_conf(conf);
1079 /* update members left on conf */
1080 dsp_cmx_hardware(conf, NULL);
1088 /* now add us to conf */
1089 if (dsp_debug & DEBUG_DSP_CMX)
1090 printk(KERN_DEBUG "searching conference %d\n",
1092 conf = dsp_cmx_search_conf(conf_id);
1094 if (dsp_debug & DEBUG_DSP_CMX)
1096 "conference doesn't exist yet, creating.\n");
1097 /* the conference doesn't exist, so we create */
1098 conf = dsp_cmx_new_conf(conf_id);
1101 } else if (!list_empty(&conf->mlist)) {
1102 member = list_entry(conf->mlist.next, struct dsp_conf_member,
1104 if (dsp->hdlc && !member->dsp->hdlc) {
1105 if (dsp_debug & DEBUG_DSP_CMX)
1107 "cannot join transparent conference.\n");
1110 if (!dsp->hdlc && member->dsp->hdlc) {
1111 if (dsp_debug & DEBUG_DSP_CMX)
1113 "cannot join hdlc conference.\n");
1117 /* add conference member */
1118 err = dsp_cmx_add_conf_member(dsp, conf);
1121 dsp->conf_id = conf_id;
1123 /* if we are alone, we do nothing! */
1124 if (list_empty(&conf->mlist)) {
1125 if (dsp_debug & DEBUG_DSP_CMX)
1127 "we are alone in this conference, so exit.\n");
1128 /* update hardware */
1129 dsp_cmx_hardware(NULL, dsp);
1133 /* update members on conf */
1134 dsp_cmx_hardware(conf, NULL);
1139 #ifdef CMX_DELAY_DEBUG
1142 showdelay(struct dsp *dsp, int samples, int delay)
1144 char bar[] = "--------------------------------------------------|";
1147 delaycount += samples;
1148 if (delaycount < 8000)
1152 sdelay = delay * 50 / (dsp_poll << 2);
1154 printk(KERN_DEBUG "DELAY (%s) %3d >%s\n", dsp->name, delay,
1155 sdelay > 50 ? "..." : bar + 50 - sdelay);
1160 * audio data is received from card
1163 dsp_cmx_receive(struct dsp *dsp, struct sk_buff *skb)
1167 struct mISDNhead *hh = mISDN_HEAD_P(skb);
1170 /* check if we have sompen */
1174 /* half of the buffer should be larger than maximum packet size */
1175 if (len >= CMX_BUFF_HALF) {
1177 "%s line %d: packet from card is too large (%d bytes). "
1178 "please make card send smaller packets OR increase "
1179 "CMX_BUFF_SIZE\n", __FILE__, __LINE__, len);
1184 * initialize pointers if not already -
1185 * also add delay if requested by PH_SIGNAL
1189 if (dsp->features.unordered) {
1190 dsp->rx_R = (hh->id & CMX_BUFF_MASK);
1192 dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
1195 dsp->rx_W = (dsp->rx_R + (dsp_poll >> 1))
1200 dsp->rx_W = dsp->cmx_delay;
1202 dsp->rx_W = dsp_poll >> 1;
1205 /* if frame contains time code, write directly */
1206 if (dsp->features.unordered) {
1207 dsp->rx_W = (hh->id & CMX_BUFF_MASK);
1208 /* printk(KERN_DEBUG "%s %08x\n", dsp->name, hh->id); */
1211 * if we underrun (or maybe overrun),
1212 * we set our new read pointer, and write silence to buffer
1214 if (((dsp->rx_W-dsp->rx_R) & CMX_BUFF_MASK) >= CMX_BUFF_HALF) {
1215 if (dsp_debug & DEBUG_DSP_CLOCK)
1217 "cmx_receive(dsp=%lx): UNDERRUN (or overrun the "
1218 "maximum delay), adjusting read pointer! "
1219 "(inst %s)\n", (u_long)dsp, dsp->name);
1220 /* flush rx buffer and set delay to dsp_poll / 2 */
1221 if (dsp->features.unordered) {
1222 dsp->rx_R = (hh->id & CMX_BUFF_MASK);
1224 dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
1226 dsp->rx_W = (dsp->rx_R + (dsp_poll >> 1))
1231 dsp->rx_W = dsp->cmx_delay;
1233 dsp->rx_W = dsp_poll >> 1;
1235 memset(dsp->rx_buff, dsp_silence, sizeof(dsp->rx_buff));
1237 /* if we have reached double delay, jump back to middle */
1239 if (((dsp->rx_W - dsp->rx_R) & CMX_BUFF_MASK) >=
1240 (dsp->cmx_delay << 1)) {
1241 if (dsp_debug & DEBUG_DSP_CLOCK)
1243 "cmx_receive(dsp=%lx): OVERRUN (because "
1244 "twice the delay is reached), adjusting "
1245 "read pointer! (inst %s)\n",
1246 (u_long)dsp, dsp->name);
1248 if (dsp->features.unordered) {
1249 dsp->rx_R = (hh->id & CMX_BUFF_MASK);
1250 dsp->rx_W = (dsp->rx_R + dsp->cmx_delay)
1254 dsp->rx_W = dsp->cmx_delay;
1256 memset(dsp->rx_buff, dsp_silence, sizeof(dsp->rx_buff));
1259 /* show where to write */
1262 "cmx_receive(dsp=%lx): rx_R(dsp)=%05x rx_W(dsp)=%05x len=%d %s\n",
1263 (u_long)dsp, dsp->rx_R, dsp->rx_W, len, dsp->name);
1266 /* write data into rx_buffer */
1273 d[w++ & CMX_BUFF_MASK] = *p++;
1277 /* increase write-pointer */
1278 dsp->rx_W = ((dsp->rx_W+len) & CMX_BUFF_MASK);
1279 #ifdef CMX_DELAY_DEBUG
1280 showdelay(dsp, len, (dsp->rx_W-dsp->rx_R) & CMX_BUFF_MASK);
1286 * send (mixed) audio data to card and control jitter
1289 dsp_cmx_send_member(struct dsp *dsp, int len, s32 *c, int members)
1291 struct dsp_conf *conf = dsp->conf;
1292 struct dsp *member, *other;
1293 register s32 sample;
1294 u8 *d, *p, *q, *o_q;
1295 struct sk_buff *nskb, *txskb;
1296 int r, rr, t, tt, o_r, o_rr;
1298 struct mISDNhead *hh, *thh;
1300 /* don't process if: */
1301 if (!dsp->b_active) { /* if not active */
1305 if (dsp->pcm_slot_tx >= 0 && /* connected to pcm slot */
1306 dsp->tx_R == dsp->tx_W && /* AND no tx-data */
1307 !(dsp->tone.tone && dsp->tone.software)) { /* AND not soft tones */
1314 "SEND members=%d dsp=%s, conf=%p, rx_R=%05x rx_W=%05x\n",
1315 members, dsp->name, conf, dsp->rx_R, dsp->rx_W);
1318 /* preload if we have delay set */
1319 if (dsp->cmx_delay && !dsp->last_tx) {
1325 /* PREPARE RESULT */
1326 nskb = mI_alloc_skb(len + preload, GFP_ATOMIC);
1329 "FATAL ERROR in mISDN_dsp.o: cannot alloc %d bytes\n",
1333 hh = mISDN_HEAD_P(nskb);
1334 hh->prim = PH_DATA_REQ;
1338 /* set pointers, indexes and stuff */
1340 p = dsp->tx_buff; /* transmit data */
1341 q = dsp->rx_buff; /* received data */
1342 d = skb_put(nskb, preload + len); /* result */
1343 t = dsp->tx_R; /* tx-pointers */
1345 r = dsp->rx_R; /* rx-pointers */
1346 rr = (r + len) & CMX_BUFF_MASK;
1348 /* preload with silence, if required */
1350 memset(d, dsp_silence, preload);
1354 /* PROCESS TONES/TX-DATA ONLY */
1355 if (dsp->tone.tone && dsp->tone.software) {
1357 dsp_tone_copy(dsp, d, len);
1358 dsp->tx_R = 0; /* clear tx buffer */
1362 /* if we have tx-data but do not use mixing */
1363 if (!dsp->tx_mix && t != tt) {
1364 /* -> send tx-data and continue when not enough */
1366 sprintf(debugbuf, "TX sending (%04x-%04x)%p: ", t, tt, p);
1368 while (r != rr && t != tt) {
1370 if (strlen(debugbuf) < 48)
1371 sprintf(debugbuf+strlen(debugbuf), " %02x", p[t]);
1373 *d++ = p[t]; /* write tx_buff */
1374 t = (t+1) & CMX_BUFF_MASK;
1375 r = (r+1) & CMX_BUFF_MASK;
1380 printk(KERN_DEBUG "%s\n", debugbuf);
1386 printk(KERN_DEBUG "%s\n", debugbuf);
1389 /* PROCESS DATA (one member / no conf) */
1390 if (!conf || members <= 1) {
1391 /* -> if echo is NOT enabled */
1393 /* -> send tx-data if available or use 0-volume */
1394 while (r != rr && t != tt) {
1395 *d++ = p[t]; /* write tx_buff */
1396 t = (t+1) & CMX_BUFF_MASK;
1397 r = (r+1) & CMX_BUFF_MASK;
1400 if (dsp_debug & DEBUG_DSP_CLOCK)
1401 printk(KERN_DEBUG "%s: RX empty\n",
1403 memset(d, dsp_silence, (rr-r)&CMX_BUFF_MASK);
1405 /* -> if echo is enabled */
1408 * -> mix tx-data with echo if available,
1411 while (r != rr && t != tt) {
1412 *d++ = dsp_audio_mix_law[(p[t]<<8)|q[r]];
1413 t = (t+1) & CMX_BUFF_MASK;
1414 r = (r+1) & CMX_BUFF_MASK;
1417 *d++ = q[r]; /* echo */
1418 r = (r+1) & CMX_BUFF_MASK;
1424 /* PROCESS DATA (two members) */
1425 #ifdef CMX_CONF_DEBUG
1430 /* "other" becomes other party */
1431 other = (list_entry(conf->mlist.next,
1432 struct dsp_conf_member, list))->dsp;
1433 if (other == member)
1434 other = (list_entry(conf->mlist.prev,
1435 struct dsp_conf_member, list))->dsp;
1436 o_q = other->rx_buff; /* received data */
1437 o_rr = (other->rx_R + len) & CMX_BUFF_MASK;
1438 /* end of rx-pointer */
1439 o_r = (o_rr - rr + r) & CMX_BUFF_MASK;
1440 /* start rx-pointer at current read position*/
1441 /* -> if echo is NOT enabled */
1444 * -> copy other member's rx-data,
1445 * if tx-data is available, mix
1447 while (o_r != o_rr && t != tt) {
1448 *d++ = dsp_audio_mix_law[(p[t]<<8)|o_q[o_r]];
1449 t = (t+1) & CMX_BUFF_MASK;
1450 o_r = (o_r+1) & CMX_BUFF_MASK;
1452 while (o_r != o_rr) {
1454 o_r = (o_r+1) & CMX_BUFF_MASK;
1456 /* -> if echo is enabled */
1459 * -> mix other member's rx-data with echo,
1460 * if tx-data is available, mix
1462 while (r != rr && t != tt) {
1463 sample = dsp_audio_law_to_s32[p[t]] +
1464 dsp_audio_law_to_s32[q[r]] +
1465 dsp_audio_law_to_s32[o_q[o_r]];
1466 if (sample < -32768)
1468 else if (sample > 32767)
1470 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1471 /* tx-data + rx_data + echo */
1472 t = (t+1) & CMX_BUFF_MASK;
1473 r = (r+1) & CMX_BUFF_MASK;
1474 o_r = (o_r+1) & CMX_BUFF_MASK;
1477 *d++ = dsp_audio_mix_law[(q[r]<<8)|o_q[o_r]];
1478 r = (r+1) & CMX_BUFF_MASK;
1479 o_r = (o_r+1) & CMX_BUFF_MASK;
1485 #ifdef DSP_NEVER_DEFINED
1488 /* PROCESS DATA (three or more members) */
1489 /* -> if echo is NOT enabled */
1492 * -> substract rx-data from conf-data,
1493 * if tx-data is available, mix
1495 while (r != rr && t != tt) {
1496 sample = dsp_audio_law_to_s32[p[t]] + *c++ -
1497 dsp_audio_law_to_s32[q[r]];
1498 if (sample < -32768)
1500 else if (sample > 32767)
1502 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1504 r = (r+1) & CMX_BUFF_MASK;
1505 t = (t+1) & CMX_BUFF_MASK;
1508 sample = *c++ - dsp_audio_law_to_s32[q[r]];
1509 if (sample < -32768)
1511 else if (sample > 32767)
1513 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1515 r = (r+1) & CMX_BUFF_MASK;
1517 /* -> if echo is enabled */
1520 * -> encode conf-data, if tx-data
1523 while (r != rr && t != tt) {
1524 sample = dsp_audio_law_to_s32[p[t]] + *c++;
1525 if (sample < -32768)
1527 else if (sample > 32767)
1529 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1531 t = (t+1) & CMX_BUFF_MASK;
1532 r = (r+1) & CMX_BUFF_MASK;
1536 if (sample < -32768)
1538 else if (sample > 32767)
1540 *d++ = dsp_audio_s16_to_law[sample & 0xffff];
1542 r = (r+1) & CMX_BUFF_MASK;
1550 * send tx-data if enabled - don't filter,
1551 * becuase we want what we send, not what we filtered
1554 /* PREPARE RESULT */
1555 txskb = mI_alloc_skb(len, GFP_ATOMIC);
1558 "FATAL ERROR in mISDN_dsp.o: "
1559 "cannot alloc %d bytes\n", len);
1561 thh = mISDN_HEAD_P(txskb);
1562 thh->prim = DL_DATA_REQ;
1564 memcpy(skb_put(txskb, len), nskb->data+preload, len);
1565 /* queue (trigger later) */
1566 skb_queue_tail(&dsp->sendq, txskb);
1571 dsp_change_volume(nskb, dsp->tx_volume);
1573 if (dsp->pipeline.inuse)
1574 dsp_pipeline_process_tx(&dsp->pipeline, nskb->data, nskb->len);
1577 dsp_bf_encrypt(dsp, nskb->data, nskb->len);
1578 /* queue and trigger */
1579 skb_queue_tail(&dsp->sendq, nskb);
1580 schedule_work(&dsp->workq);
1583 static u32 jittercount; /* counter for jitter check */;
1584 struct timer_list dsp_spl_tl;
1585 u32 dsp_spl_jiffies; /* calculate the next time to fire */
1586 static u16 dsp_count; /* last sample count */
1587 static int dsp_count_valid ; /* if we have last sample count */
1590 dsp_cmx_send(void *arg)
1592 struct dsp_conf *conf;
1593 struct dsp_conf_member *member;
1595 int mustmix, members;
1596 s32 mixbuffer[MAX_POLL+100], *c;
1599 int jittercheck = 0, delay, i;
1604 spin_lock_irqsave(&dsp_lock, flags);
1606 if (!dsp_count_valid) {
1607 dsp_count = mISDN_clock_get();
1609 dsp_count_valid = 1;
1611 count = mISDN_clock_get();
1612 length = count - dsp_count;
1615 if (length > MAX_POLL + 100)
1616 length = MAX_POLL + 100;
1617 /* printk(KERN_DEBUG "len=%d dsp_count=0x%x\n", length, dsp_count); */
1620 * check if jitter needs to be checked (this is every second)
1622 jittercount += length;
1623 if (jittercount >= 8000) {
1624 jittercount -= 8000;
1628 /* loop all members that do not require conference mixing */
1629 list_for_each_entry(dsp, &dsp_ilist, list) {
1636 members = count_list_member(&conf->mlist);
1637 #ifdef CMX_CONF_DEBUG
1638 if (conf->software && members > 1)
1640 if (conf->software && members > 2)
1645 /* transmission required */
1647 dsp_cmx_send_member(dsp, length, mixbuffer, members);
1650 * unused mixbuffer is given to prevent a
1651 * potential null-pointer-bug
1656 /* loop all members that require conference mixing */
1657 list_for_each_entry(conf, &conf_ilist, list) {
1658 /* count members and check hardware */
1659 members = count_list_member(&conf->mlist);
1660 #ifdef CMX_CONF_DEBUG
1661 if (conf->software && members > 1) {
1663 if (conf->software && members > 2) {
1665 /* check for hdlc conf */
1666 member = list_entry(conf->mlist.next,
1667 struct dsp_conf_member, list);
1668 if (member->dsp->hdlc)
1671 memset(mixbuffer, 0, length*sizeof(s32));
1672 list_for_each_entry(member, &conf->mlist, list) {
1674 /* get range of data to mix */
1678 rr = (r + length) & CMX_BUFF_MASK;
1679 /* add member's data */
1681 *c++ += dsp_audio_law_to_s32[q[r]];
1682 r = (r+1) & CMX_BUFF_MASK;
1686 /* process each member */
1687 list_for_each_entry(member, &conf->mlist, list) {
1689 dsp_cmx_send_member(member->dsp, length,
1690 mixbuffer, members);
1695 /* delete rx-data, increment buffers, change pointers */
1696 list_for_each_entry(dsp, &dsp_ilist, list) {
1702 /* move receive pointer when receiving */
1703 if (!dsp->rx_is_off) {
1704 rr = (r + length) & CMX_BUFF_MASK;
1705 /* delete rx-data */
1708 r = (r+1) & CMX_BUFF_MASK;
1710 /* increment rx-buffer pointer */
1711 dsp->rx_R = r; /* write incremented read pointer */
1714 /* check current rx_delay */
1715 delay = (dsp->rx_W-dsp->rx_R) & CMX_BUFF_MASK;
1716 if (delay >= CMX_BUFF_HALF)
1717 delay = 0; /* will be the delay before next write */
1718 /* check for lower delay */
1719 if (delay < dsp->rx_delay[0])
1720 dsp->rx_delay[0] = delay;
1721 /* check current tx_delay */
1722 delay = (dsp->tx_W-dsp->tx_R) & CMX_BUFF_MASK;
1723 if (delay >= CMX_BUFF_HALF)
1724 delay = 0; /* will be the delay before next write */
1725 /* check for lower delay */
1726 if (delay < dsp->tx_delay[0])
1727 dsp->tx_delay[0] = delay;
1729 /* find the lowest of all rx_delays */
1730 delay = dsp->rx_delay[0];
1732 while (i < MAX_SECONDS_JITTER_CHECK) {
1733 if (delay > dsp->rx_delay[i])
1734 delay = dsp->rx_delay[i];
1738 * remove rx_delay only if we have delay AND we
1739 * have not preset cmx_delay AND
1740 * the delay is greater dsp_poll
1742 if (delay > dsp_poll && !dsp->cmx_delay) {
1743 if (dsp_debug & DEBUG_DSP_CLOCK)
1745 "%s lowest rx_delay of %d bytes for"
1746 " dsp %s are now removed.\n",
1750 rr = (r + delay - (dsp_poll >> 1))
1752 /* delete rx-data */
1755 r = (r+1) & CMX_BUFF_MASK;
1757 /* increment rx-buffer pointer */
1759 /* write incremented read pointer */
1761 /* find the lowest of all tx_delays */
1762 delay = dsp->tx_delay[0];
1764 while (i < MAX_SECONDS_JITTER_CHECK) {
1765 if (delay > dsp->tx_delay[i])
1766 delay = dsp->tx_delay[i];
1770 * remove delay only if we have delay AND we
1771 * have enabled tx_dejitter
1773 if (delay > dsp_poll && dsp->tx_dejitter) {
1774 if (dsp_debug & DEBUG_DSP_CLOCK)
1776 "%s lowest tx_delay of %d bytes for"
1777 " dsp %s are now removed.\n",
1781 rr = (r + delay - (dsp_poll >> 1))
1783 /* delete tx-data */
1786 r = (r+1) & CMX_BUFF_MASK;
1788 /* increment rx-buffer pointer */
1790 /* write incremented read pointer */
1792 /* scroll up delays */
1793 i = MAX_SECONDS_JITTER_CHECK - 1;
1795 dsp->rx_delay[i] = dsp->rx_delay[i-1];
1796 dsp->tx_delay[i] = dsp->tx_delay[i-1];
1799 dsp->tx_delay[0] = CMX_BUFF_HALF; /* (infinite) delay */
1800 dsp->rx_delay[0] = CMX_BUFF_HALF; /* (infinite) delay */
1804 /* if next event would be in the past ... */
1805 if ((s32)(dsp_spl_jiffies+dsp_tics-jiffies) <= 0)
1806 dsp_spl_jiffies = jiffies + 1;
1808 dsp_spl_jiffies += dsp_tics;
1810 dsp_spl_tl.expires = dsp_spl_jiffies;
1811 add_timer(&dsp_spl_tl);
1814 spin_unlock_irqrestore(&dsp_lock, flags);
1818 * audio data is transmitted from upper layer to the dsp
1821 dsp_cmx_transmit(struct dsp *dsp, struct sk_buff *skb)
1825 int space; /* todo: , l = skb->len; */
1827 char debugbuf[256] = "";
1830 /* check if there is enough space, and then copy */
1835 space = (ww - w - 1) & CMX_BUFF_MASK;
1836 /* write-pointer should not overrun nor reach read pointer */
1837 if (space < skb->len) {
1838 /* write to the space we have left */
1839 ww = (ww - 1) & CMX_BUFF_MASK; /* end one byte prior tx_R */
1840 if (dsp_debug & DEBUG_DSP_CLOCK)
1841 printk(KERN_DEBUG "%s: TX overflow space=%d skb->len="
1842 "%d, w=0x%04x, ww=0x%04x\n", __func__, space,
1845 /* write until all byte are copied */
1846 ww = (w + skb->len) & CMX_BUFF_MASK;
1849 /* show current buffer */
1852 "cmx_transmit(dsp=%lx) %d bytes to 0x%x-0x%x. %s\n",
1853 (u_long)dsp, (ww-w)&CMX_BUFF_MASK, w, ww, dsp->name);
1856 /* copy transmit data to tx-buffer */
1858 sprintf(debugbuf, "TX getting (%04x-%04x)%p: ", w, ww, p);
1862 if (strlen(debugbuf) < 48)
1863 sprintf(debugbuf+strlen(debugbuf), " %02x", *d);
1866 w = (w+1) & CMX_BUFF_MASK;
1869 printk(KERN_DEBUG "%s\n", debugbuf);
1875 * hdlc data is received from card and sent to all members.
1878 dsp_cmx_hdlc(struct dsp *dsp, struct sk_buff *skb)
1880 struct sk_buff *nskb = NULL;
1881 struct dsp_conf_member *member;
1882 struct mISDNhead *hh;
1884 /* not if not active */
1888 /* check if we have sompen */
1894 /* in case of hardware (echo) */
1895 if (dsp->pcm_slot_tx >= 0)
1898 nskb = skb_clone(skb, GFP_ATOMIC);
1900 hh = mISDN_HEAD_P(nskb);
1901 hh->prim = PH_DATA_REQ;
1903 skb_queue_tail(&dsp->sendq, nskb);
1904 schedule_work(&dsp->workq);
1908 /* in case of hardware conference */
1909 if (dsp->conf->hardware)
1911 list_for_each_entry(member, &dsp->conf->mlist, list) {
1912 if (dsp->echo || member->dsp != dsp) {
1913 nskb = skb_clone(skb, GFP_ATOMIC);
1915 hh = mISDN_HEAD_P(nskb);
1916 hh->prim = PH_DATA_REQ;
1918 skb_queue_tail(&member->dsp->sendq, nskb);
1919 schedule_work(&member->dsp->workq);