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mISDN/drivers/isdn/hardware/mISDN/dsp_cmx.c

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/* $Id$
*
* Audio crossconnecting/conferrencing (hardware level).
*
* Copyright 2002 by Andreas Eversberg (jolly@eversberg.eu)
*
* This software may be used and distributed according to the terms
* of the GNU General Public License, incorporated herein by reference.
*
*/
/*
* The process of adding and removing parties to/from a conference:
*
* There is a chain of conference_t which has one or more members in a chain
* of conf_member_t.
*
* After a party is added, the conference is checked for hardware capability.
* Also if a party is removed, the conference is checked again.
*
* There are 3 different solutions: -1 = software, 0 = hardware-crossconnect
* 1-n = hardware-conference. The n will give the conference number.
*
* Depending on the change after removal or insertion of a party, hardware
* commands are given.
*
* The current solution is stored within the conference_t entry.
*/
/* HOW THE CMX WORKS:
*
* There are 3 types of interaction: One member is alone, in this case only
* data flow from upper to lower layer is done.
* Two members will also exchange their data so they are crossconnected.
* Three or more members will be added in a conference and will hear each
* other but will not receive their own speech (echo) if not enabled.
*
* Features of CMX are:
* - Crossconnecting or even conference, if more than two members are together.
* - Force mixing of transmit data with other crossconnect/conference members.
* - Echo generation to benchmark the delay of audio processing.
* - Use hardware to minimize cpu load, disable FIFO load and minimize delay.
* - Dejittering and clock generation.
*
* There are 2 buffers:
*
*
* RX-Buffer
* R W
* | |
* ----------------+-------------+-------------------
*
* The rx-buffer is a ring buffer used to store the received data for each
* individual member. This is only the case if data needs to be dejittered
* or in case of a conference where different clocks require reclocking.
* The transmit-clock (R) will read the buffer.
* If the clock overruns the write-pointer, we will have a buffer underrun.
* If the write pointer always has a certain distance from the transmit-
* clock, we will have a delay. The delay will dynamically be increased and
* reduced.
*
*
* TX-Buffer
* R W
* | |
* -----------------+--------+-----------------------
*
* The tx-buffer is a ring buffer to queue the transmit data from user space
* until it will be mixed or sent. There are two pointers, R and W. If the write
* pointer W would reach or overrun R, the buffer would overrun. In this case
* (some) data is dropped so that it will not overrun.
*
*
* Clock:
*
* A Clock is not required, if the data source has exactly one clock. In this
* case the data source is forwarded to the destination.
*
* A Clock is required, because the data source
* - has multiple clocks.
* - has no clock due to jitter (VoIP).
* In this case the system's clock is used. The clock resolution depends on
* the jiffie resolution.
*
* If a member joins a conference:
*
* - If a member joins, its rx_buff is set to silence and change read pointer
* to transmit clock.
*
* The procedure of received data from card is explained in cmx_receive.
* The procedure of received data from user space is explained in cmx_transmit.
* The procedure of transmit data to card is cmx_send.
*
*
* Interaction with other features:
*
* DTMF:
* DTMF decoding is done before the data is crossconnected.
*
* Volume change:
* Changing rx-volume is done before the data is crossconnected. The tx-volume
* must be changed whenever data is transmitted to the card by the cmx.
*
* Tones:
* If a tone is enabled, it will be processed whenever data is transmitted to
* the card. It will replace the tx-data from the user space.
* If tones are generated by hardware, this conference member is removed for
* this time.
*
* Disable rx-data:
* If cmx is realized in hardware, rx data will be disabled if requested by
* the upper layer. If dtmf decoding is done by software and enabled, rx data
* will not be diabled but blocked to the upper layer.
*
* HFC conference engine:
* If it is possible to realize all features using hardware, hardware will be
* used if not forbidden by control command. Disabling rx-data provides
* absolutely traffic free audio processing. (except for the quick 1-frame
* upload of a tone loop, only once for a new tone)
*
*/
// delay.h is required for hw_lock.h
#include <linux/delay.h>
#include <linux/vmalloc.h>
#include "layer1.h"
#include "helper.h"
#include "debug.h"
#include "dsp.h"
//#define CMX_CONF_DEBUG /* debugging of multi party conference, by using conference even with two members */
//#define CMX_DEBUG /* massive read/write pointer output */
LIST_HEAD(Conf_list);
/*
* debug cmx memory structure
*/
void
dsp_cmx_debug(dsp_t *dsp)
{
conference_t *conf;
conf_member_t *member;
dsp_t *odsp;
printk(KERN_DEBUG "-----Current DSP\n");
list_for_each_entry(odsp, &dsp_obj.ilist, list) {
printk(KERN_DEBUG "* %s echo=%d txmix=%d", odsp->inst.name, odsp->echo, odsp->tx_mix);
if (odsp->conf)
printk(" (Conf %d)", odsp->conf->id);
if (dsp == odsp)
printk(" *this*");
printk("\n");
}
printk(KERN_DEBUG "-----Current Conf:\n");
list_for_each_entry(conf, &Conf_list, list) {
printk(KERN_DEBUG "* Conf %d (%p)\n", conf->id, conf);
list_for_each_entry(member, &conf->mlist, list) {
printk(KERN_DEBUG
" - member = %s (slot_tx %d, bank_tx %d, slot_rx %d, bank_rx %d hfc_conf %d)%s\n",
member->dsp->inst.name, member->dsp->pcm_slot_tx, member->dsp->pcm_bank_tx,
member->dsp->pcm_slot_rx, member->dsp->pcm_bank_rx, member->dsp->hfc_conf,
(member->dsp==dsp)?" *this*":"");
}
}
printk(KERN_DEBUG "-----end\n");
}
/*
* search conference
*/
static conference_t
*dsp_cmx_search_conf(u32 id)
{
conference_t *conf;
if (!id) {
printk(KERN_WARNING "%s: conference ID is 0.\n",
__FUNCTION__);
return(NULL);
}
/* search conference */
list_for_each_entry(conf, &Conf_list, list)
if (conf->id == id)
return(conf);
return(NULL);
}
/*
* add member to conference
*/
static int
dsp_cmx_add_conf_member(dsp_t *dsp, conference_t *conf)
{
conf_member_t *member;
if (!conf || !dsp) {
printk(KERN_WARNING "%s: conf or dsp is 0.\n", __FUNCTION__);
return(-EINVAL);
}
if (dsp->member) {
printk(KERN_WARNING "%s: dsp is already member in a conf.\n",
__FUNCTION__);
return(-EINVAL);
}
if (dsp->conf) {
printk(KERN_WARNING "%s: dsp is already in a conf.\n",
__FUNCTION__);
return(-EINVAL);
}
if (!(member = kmalloc(sizeof(conf_member_t), GFP_ATOMIC))) {
printk(KERN_ERR "kmalloc conf_member_t failed\n");
return(-ENOMEM);
}
memset(member, 0, sizeof(conf_member_t));
member->dsp = dsp;
/* clear rx buffer */
memset(dsp->rx_buff, dsp_silence, sizeof(dsp->rx_buff));
dsp->rx_W = dsp->rx_R = -1; /* reset pointers */
list_add_tail(&member->list, &conf->mlist);
dsp->conf = conf;
dsp->member = member;
return(0);
}
/*
* del member from conference
*/
int
dsp_cmx_del_conf_member(dsp_t *dsp)
{
conf_member_t *member;
if (!dsp) {
printk(KERN_WARNING "%s: dsp is 0.\n",
__FUNCTION__);
return(-EINVAL);
}
if (!dsp->conf) {
printk(KERN_WARNING "%s: dsp is not in a conf.\n",
__FUNCTION__);
return(-EINVAL);
}
if (list_empty(&dsp->conf->mlist)) {
printk(KERN_WARNING "%s: dsp has linked an empty conf.\n",
__FUNCTION__);
return(-EINVAL);
}
/* find us in conf */
list_for_each_entry(member, &dsp->conf->mlist, list) {
if (member->dsp == dsp) {
list_del(&member->list);
dsp->conf = NULL;
dsp->member = NULL;
kfree(member);
return(0);
}
}
printk(KERN_WARNING "%s: dsp is not present in its own conf_meber list.\n",
__FUNCTION__);
return(-EINVAL);
}
/*
* new conference
*/
static conference_t
*dsp_cmx_new_conf(u32 id)
{
conference_t *conf;
if (!id) {
printk(KERN_WARNING "%s: id is 0.\n",
__FUNCTION__);
return(NULL);
}
if (!(conf = kmalloc(sizeof(conference_t), GFP_ATOMIC))) {
printk(KERN_ERR "kmalloc conference_t failed\n");
return(NULL);
}
memset(conf, 0, sizeof(conference_t));
INIT_LIST_HEAD(&conf->mlist);
conf->id = id;
list_add_tail(&conf->list, &Conf_list);
return(conf);
}
/*
* del conference
*/
int
dsp_cmx_del_conf(conference_t *conf)
{
if (!conf) {
printk(KERN_WARNING "%s: conf is null.\n",
__FUNCTION__);
return(-EINVAL);
}
if (!list_empty(&conf->mlist)) {
printk(KERN_WARNING "%s: conf not empty.\n",
__FUNCTION__);
return(-EINVAL);
}
list_del(&conf->list);
kfree(conf);
return(0);
}
/*
* send HW message to hfc card
*/
static void
dsp_cmx_hw_message(dsp_t *dsp, u32 message, u32 param1, u32 param2, u32 param3, u32 param4)
{
struct sk_buff *nskb;
u32 param[4];
param[0] = param1;
param[1] = param2;
param[2] = param3;
param[3] = param4;
nskb = create_link_skb(PH_CONTROL | REQUEST, message, sizeof(param), param, 0);
if (!nskb) {
printk(KERN_ERR "%s: No mem for skb.\n", __FUNCTION__);
return;
}
/* unlocking is not required, because we don't expect a response */
if (mISDN_queue_down(&dsp->inst, 0, nskb))
dev_kfree_skb(nskb);
}
/*
* do hardware update and set the software/hardware flag
*
* either a conference or a dsp instance can be given
* if only dsp instance is given, the instance is not associated with a conf
* and therefore removed. if a conference is given, the dsp is expected to
* be member of that conference.
*/
void
dsp_cmx_hardware(conference_t *conf, dsp_t *dsp)
{
conf_member_t *member, *nextm;
dsp_t *finddsp;
int memb = 0, i, ii, i1, i2;
int freeunits[8];
u_char freeslots[256];
int same_hfc = -1, same_pcm = -1, current_conf = -1, all_conf = 1;
/* dsp gets updated (no conf) */
//printk("-----1\n");
if (!conf) {
//printk("-----2\n");
if (!dsp)
return;
//printk("-----3\n");
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s checking dsp %s\n", __FUNCTION__, dsp->inst.name);
//printk("-----a\n");
one_member:
/* remove HFC conference if enabled */
if (dsp->hfc_conf >= 0) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s removing %s from HFC conf %d because dsp is split\n", __FUNCTION__, dsp->inst.name, dsp->hfc_conf);
dsp_cmx_hw_message(dsp, HW_CONF_SPLIT, 0, 0, 0, 0);
dsp->hfc_conf = -1;
}
if (!dsp->echo) {
/* NO ECHO: remove PCM slot if assigned */
if (dsp->pcm_slot_tx>=0 || dsp->pcm_slot_rx>=0) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s removing %s from PCM slot %d (TX) %d (RX) because dsp is split (no echo)\n", __FUNCTION__, dsp->inst.name, dsp->pcm_slot_tx, dsp->pcm_slot_rx);
dsp_cmx_hw_message(dsp, HW_PCM_DISC, 0, 0, 0, 0);
dsp->pcm_slot_tx = -1;
dsp->pcm_bank_tx = -1;
dsp->pcm_slot_rx = -1;
dsp->pcm_bank_rx = -1;
}
return;
}
/* ECHO: already echo */
if (dsp->pcm_slot_tx>=0 && dsp->pcm_slot_rx<0
&& dsp->pcm_bank_tx==2 && dsp->pcm_bank_rx==2)
return;
/* ECHO: if slot already assigned */
if (dsp->pcm_slot_tx>=0) {
dsp->pcm_slot_rx = dsp->pcm_slot_tx;
dsp->pcm_bank_tx = 2; /* loop */
dsp->pcm_bank_rx = 2;
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s refresh %s for echo using slot %d\n", __FUNCTION__, dsp->inst.name, dsp->pcm_slot_tx);
dsp_cmx_hw_message(dsp, HW_PCM_CONN, dsp->pcm_slot_tx, 2, dsp->pcm_slot_rx, 2);
return;
}
/* ECHO: find slot */
dsp->pcm_slot_tx = -1;
dsp->pcm_slot_rx = -1;
memset(freeslots, 1, sizeof(freeslots));
list_for_each_entry(finddsp, &dsp_obj.ilist, list) {
if (finddsp->features.pcm_id==dsp->features.pcm_id) {
if (finddsp->pcm_slot_rx>=0
&& finddsp->pcm_slot_rx<sizeof(freeslots))
freeslots[finddsp->pcm_slot_tx] = 0;
if (finddsp->pcm_slot_tx>=0
&& finddsp->pcm_slot_tx<sizeof(freeslots))
freeslots[finddsp->pcm_slot_rx] = 0;
}
}
i = 0;
ii = dsp->features.pcm_slots;
while(i < ii) {
if (freeslots[i])
break;
i++;
}
if (i == ii) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s no slot available for echo\n", __FUNCTION__);
/* no more slots available */
return;
}
/* assign free slot */
dsp->pcm_slot_tx = i;
dsp->pcm_slot_rx = i;
dsp->pcm_bank_tx = 2; /* loop */
dsp->pcm_bank_rx = 2;
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s assign echo for %s using slot %d\n", __FUNCTION__, dsp->inst.name, dsp->pcm_slot_tx);
dsp_cmx_hw_message(dsp, HW_PCM_CONN, dsp->pcm_slot_tx, 2, dsp->pcm_slot_rx, 2);
return;
}
//printk("-----4\n");
/* conf gets updated (all members) */
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s checking conference %d\n", __FUNCTION__, conf->id);
//printk("-----5\n");
if (list_empty(&conf->mlist)) {
printk(KERN_ERR "%s: conference whithout members\n", __FUNCTION__);
return;
}
member = list_entry(conf->mlist.next, conf_member_t, list);
same_hfc = member->dsp->features.hfc_id;
same_pcm = member->dsp->features.pcm_id;
/* check all members in our conference */
list_for_each_entry(member, &conf->mlist, list) {
/* check if member uses mixing */
if (member->dsp->tx_mix) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s dsp %s cannot form a conf, because tx_mix is turned on\n", __FUNCTION__, member->dsp->inst.name);
conf_software:
// printk(KERN_NOTICE "****** SOFTWARE CONFERENCE\n");
list_for_each_entry(member, &conf->mlist, list) {
dsp = member->dsp;
/* remove HFC conference if enabled */
if (dsp->hfc_conf >= 0) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s removing %s from HFC conf %d because not possible with hardware\n", __FUNCTION__, dsp->inst.name, dsp->hfc_conf);
dsp_cmx_hw_message(dsp, HW_CONF_SPLIT, 0, 0, 0, 0);
dsp->hfc_conf = -1;
}
/* remove PCM slot if assigned */
if (dsp->pcm_slot_tx>=0 || dsp->pcm_slot_rx>=0) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s removing %s from PCM slot %d (TX) slot %d (RX) because not possible with hardware\n", __FUNCTION__, dsp->inst.name, dsp->pcm_slot_tx, dsp->pcm_slot_rx);
dsp_cmx_hw_message(dsp, HW_PCM_DISC, 0, 0, 0, 0);
dsp->pcm_slot_tx = -1;
dsp->pcm_bank_tx = -1;
dsp->pcm_slot_rx = -1;
dsp->pcm_bank_rx = -1;
}
}
conf->hardware = 0;
conf->software = 1;
return;
}
/* check if member has echo turned on */
if (member->dsp->echo) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s dsp %s cannot form a conf, because echo is turned on\n", __FUNCTION__, member->dsp->inst.name);
goto conf_software;
}
/* check if member has tx_mix turned on */
if (member->dsp->tx_mix) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s dsp %s cannot form a conf, because tx_mix is turned on\n", __FUNCTION__, member->dsp->inst.name);
goto conf_software;
}
/* check if member changes volume at an not suppoted level */
if (member->dsp->tx_volume) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s dsp %s cannot form a conf, because tx_volume is changed\n", __FUNCTION__, member->dsp->inst.name);
goto conf_software;
}
if (member->dsp->rx_volume) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s dsp %s cannot form a conf, because rx_volume is changed\n", __FUNCTION__, member->dsp->inst.name);
goto conf_software;
}
/* check if encryption is enabled */
if (member->dsp->bf_enable) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s dsp %s cannot form a conf, because encryption is enabled\n", __FUNCTION__, member->dsp->inst.name);
goto conf_software;
}
/* check if echo cancellation is enabled */
if (member->dsp->cancel_enable) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s dsp %s cannot form a conf, because echo cancellation is enabled\n", __FUNCTION__, member->dsp->inst.name);
goto conf_software;
}
/* check if member is on a card with PCM support */
if (member->dsp->features.pcm_id < 0) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s dsp %s cannot form a conf, because dsp has no PCM bus\n", __FUNCTION__, member->dsp->inst.name);
goto conf_software;
}
/* check if relations are on the same PCM bus */
if (member->dsp->features.pcm_id != same_pcm) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s dsp %s cannot form a conf, because dsp is on a different PCM bus than the first dsp\n",
__FUNCTION__, member->dsp->inst.name);
goto conf_software;
}
/* determine if members are on the same hfc chip */
if (same_hfc != member->dsp->features.hfc_id)
same_hfc = -1;
/* if there are members already in a conference */
if (current_conf<0 && member->dsp->hfc_conf>=0)
current_conf = member->dsp->hfc_conf;
/* if any member is not in a conference */
if (member->dsp->hfc_conf < 0)
all_conf = 0;
memb++;
}
/* if no member, this is an error */
if (memb < 1)
return;
/* one member */
if (memb == 1) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s conf %d cannot form a HW conference, because dsp is alone\n", __FUNCTION__, conf->id);
conf->hardware = 0;
conf->software = 1;
member = list_entry(conf->mlist.next, conf_member_t, list);
dsp = member->dsp;
goto one_member;
}
/* ok, now we are sure that all members are on the same pcm.
* now we will see if we have only two members, so we can do
* crossconnections, which don't have any limitations.
*/
/* if we have only two members */
if (memb == 2) {
member = list_entry(conf->mlist.next, conf_member_t, list);
nextm = list_entry(member->list.next, conf_member_t, list);
/* remove HFC conference if enabled */
if (member->dsp->hfc_conf >= 0) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s removing %s from HFC conf %d because two parties require only a PCM slot\n", __FUNCTION__, member->dsp->inst.name, member->dsp->hfc_conf);
dsp_cmx_hw_message(member->dsp, HW_CONF_SPLIT, 0, 0, 0, 0);
member->dsp->hfc_conf = -1;
}
if (nextm->dsp->hfc_conf >= 0) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s removing %s from HFC conf %d because two parties require only a PCM slot\n", __FUNCTION__, nextm->dsp->inst.name, nextm->dsp->hfc_conf);
dsp_cmx_hw_message(nextm->dsp, HW_CONF_SPLIT, 0, 0, 0, 0);
nextm->dsp->hfc_conf = -1;
}
/* if members have two banks (and not on the same chip) */
if (member->dsp->features.pcm_banks>1
&& nextm->dsp->features.pcm_banks>1
&& member->dsp->features.hfc_id!=nextm->dsp->features.hfc_id) {
/* if both members have same slots with crossed banks */
if (member->dsp->pcm_slot_tx>=0
&& member->dsp->pcm_slot_rx>=0
&& nextm->dsp->pcm_slot_tx>=0
&& nextm->dsp->pcm_slot_rx>=0
&& nextm->dsp->pcm_slot_tx==member->dsp->pcm_slot_rx
&& nextm->dsp->pcm_slot_rx==member->dsp->pcm_slot_tx
&& nextm->dsp->pcm_slot_tx==member->dsp->pcm_slot_tx
&& member->dsp->pcm_bank_tx!=member->dsp->pcm_bank_rx
&& nextm->dsp->pcm_bank_tx!=nextm->dsp->pcm_bank_rx) {
/* all members have same slot */
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s dsp %s & %s stay joined on PCM slot %d bank %d (TX) bank %d (RX) (on different chips)\n", __FUNCTION__,
member->dsp->inst.name, nextm->dsp->inst.name,
member->dsp->pcm_slot_tx, member->dsp->pcm_bank_tx, member->dsp->pcm_bank_rx);
conf->hardware = 0;
conf->software = 1;
return;
}
/* find a new slot */
memset(freeslots, 1, sizeof(freeslots));
list_for_each_entry(dsp, &dsp_obj.ilist, list) {
if (dsp!=member->dsp
&& dsp!=nextm->dsp
&& member->dsp->features.pcm_id==dsp->features.pcm_id) {
if (dsp->pcm_slot_rx>=0
&& dsp->pcm_slot_rx<sizeof(freeslots))
freeslots[dsp->pcm_slot_tx] = 0;
if (dsp->pcm_slot_tx>=0
&& dsp->pcm_slot_tx<sizeof(freeslots))
freeslots[dsp->pcm_slot_rx] = 0;
}
}
i = 0;
ii = member->dsp->features.pcm_slots;
while(i < ii) {
if (freeslots[i])
break;
i++;
}
if (i == ii) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s no slot available for %s & %s\n", __FUNCTION__,
member->dsp->inst.name, nextm->dsp->inst.name);
/* no more slots available */
goto conf_software;
}
/* assign free slot */
member->dsp->pcm_slot_tx = i;
member->dsp->pcm_slot_rx = i;
nextm->dsp->pcm_slot_tx = i;
nextm->dsp->pcm_slot_rx = i;
member->dsp->pcm_bank_rx = 0;
member->dsp->pcm_bank_tx = 1;
nextm->dsp->pcm_bank_rx = 1;
nextm->dsp->pcm_bank_tx = 0;
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s adding %s & %s to new PCM slot %d (TX and RX on different chips) because both members have not same slots\n", __FUNCTION__,
member->dsp->inst.name, nextm->dsp->inst.name, member->dsp->pcm_slot_tx);
dsp_cmx_hw_message(member->dsp, HW_PCM_CONN, member->dsp->pcm_slot_tx, member->dsp->pcm_bank_tx,
member->dsp->pcm_slot_rx, member->dsp->pcm_bank_rx);
dsp_cmx_hw_message(nextm->dsp, HW_PCM_CONN, nextm->dsp->pcm_slot_tx, nextm->dsp->pcm_bank_tx,
nextm->dsp->pcm_slot_rx, nextm->dsp->pcm_bank_rx);
conf->hardware = 1;
conf->software = 0;
return;
/* if members have one bank (or on the same chip) */
} else {
/* if both members have different crossed slots */
if (member->dsp->pcm_slot_tx>=0
&& member->dsp->pcm_slot_rx>=0
&& nextm->dsp->pcm_slot_tx>=0
&& nextm->dsp->pcm_slot_rx>=0
&& nextm->dsp->pcm_slot_tx==member->dsp->pcm_slot_rx
&& nextm->dsp->pcm_slot_rx==member->dsp->pcm_slot_tx
&& member->dsp->pcm_slot_tx!=member->dsp->pcm_slot_rx
&& member->dsp->pcm_bank_tx==0
&& member->dsp->pcm_bank_rx==0
&& nextm->dsp->pcm_bank_tx==0
&& nextm->dsp->pcm_bank_rx==0) {
/* all members have same slot */
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s dsp %s & %s stay joined on PCM slot %d (TX) %d (RX) on same chip or one bank PCM)\n", __FUNCTION__,
member->dsp->inst.name, nextm->dsp->inst.name, member->dsp->pcm_slot_tx, member->dsp->pcm_slot_rx);
conf->hardware = 0;
conf->software = 1;
return;
}
/* find two new slot */
memset(freeslots, 1, sizeof(freeslots));
list_for_each_entry(dsp, &dsp_obj.ilist, list) {
if (dsp!=member->dsp
&& dsp!=nextm->dsp
&& member->dsp->features.pcm_id==dsp->features.pcm_id) {
if (dsp->pcm_slot_rx>=0
&& dsp->pcm_slot_rx<sizeof(freeslots))
freeslots[dsp->pcm_slot_tx] = 0;
if (dsp->pcm_slot_tx>=0
&& dsp->pcm_slot_tx<sizeof(freeslots))
freeslots[dsp->pcm_slot_rx] = 0;
}
}
i1 = 0;
ii = member->dsp->features.pcm_slots;
while(i1 < ii) {
if (freeslots[i1])
break;
i1++;
}
if (i1 == ii) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s no slot available for %s & %s\n", __FUNCTION__,
member->dsp->inst.name, nextm->dsp->inst.name);
/* no more slots available */
goto conf_software;
}
i2 = i1+1;
while(i2 < ii) {
if (freeslots[i2])
break;
i2++;
}
if (i2 == ii) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s no slot available for %s & %s\n", __FUNCTION__,
member->dsp->inst.name, nextm->dsp->inst.name);
/* no more slots available */
goto conf_software;
}
/* assign free slots */
member->dsp->pcm_slot_tx = i1;
member->dsp->pcm_slot_rx = i2;
nextm->dsp->pcm_slot_tx = i2;
nextm->dsp->pcm_slot_rx = i1;
member->dsp->pcm_bank_rx = 0;
member->dsp->pcm_bank_tx = 0;
nextm->dsp->pcm_bank_rx = 0;
nextm->dsp->pcm_bank_tx = 0;
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s adding %s & %s to new PCM slot %d (TX) %d (RX) on same chip or one bank PCM, because both members have not crossed slots\n", __FUNCTION__,
member->dsp->inst.name, nextm->dsp->inst.name, member->dsp->pcm_slot_tx,
member->dsp->pcm_slot_rx);
dsp_cmx_hw_message(member->dsp, HW_PCM_CONN, member->dsp->pcm_slot_tx, member->dsp->pcm_bank_tx, member->dsp->pcm_slot_rx, member->dsp->pcm_bank_rx);
dsp_cmx_hw_message(nextm->dsp, HW_PCM_CONN, nextm->dsp->pcm_slot_tx, nextm->dsp->pcm_bank_tx, nextm->dsp->pcm_slot_rx, nextm->dsp->pcm_bank_rx);
conf->hardware = 1;
conf->software = 0;
return;
}
}
/* if we have more than two, we may check if we have a conference
* unit available on the chip. also all members must be on the same
*/
/* if not the same HFC chip */
if (same_hfc < 0) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s conference %d cannot be formed, because members are on different chips or not on HFC chip\n",
__FUNCTION__, conf->id);
goto conf_software;
}
/* if all members already have the same conference */
if (all_conf)
return;
/* if there is an existing conference, but not all members have joined
*/
if (current_conf >= 0) {
join_members:
list_for_each_entry(member, &conf->mlist, list) {
/* join to current conference */
if (member->dsp->hfc_conf == current_conf) {
continue;
}
/* get a free timeslot first */
memset(freeslots, 1, sizeof(freeslots));
list_for_each_entry(dsp, &dsp_obj.ilist, list) {
/* not checking current member, because
* slot will be overwritten.
*/
if (dsp!=member->dsp
/* dsp must be on the same PCM */
&& member->dsp->features.pcm_id==dsp->features.pcm_id) {
/* dsp must be on a slot */
if (dsp->pcm_slot_tx>=0
&& dsp->pcm_slot_tx<sizeof(freeslots))
freeslots[dsp->pcm_slot_tx] = 0;
if (dsp->pcm_slot_rx>=0
&& dsp->pcm_slot_rx<sizeof(freeslots))
freeslots[dsp->pcm_slot_rx] = 0;
}
}
i = 0;
ii = member->dsp->features.pcm_slots;
while(i < ii) {
if (freeslots[i])
break;
i++;
}
if (i == ii) {
/* no more slots available */
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s conference %d cannot be formed, because no slot free\n", __FUNCTION__, conf->id);
goto conf_software;
}
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s changing dsp %s to HW conference %d slot %d\n", __FUNCTION__, member->dsp->inst.name, current_conf, i);
/* assign free slot & set PCM & join conf */
member->dsp->pcm_slot_tx = i;
member->dsp->pcm_slot_rx = i;
member->dsp->pcm_bank_tx = 2; /* loop */
member->dsp->pcm_bank_rx = 2;
member->dsp->hfc_conf = current_conf;
dsp_cmx_hw_message(member->dsp, HW_PCM_CONN, i, 2, i, 2);
dsp_cmx_hw_message(member->dsp, HW_CONF_JOIN, current_conf, 0, 0, 0);
}
return;
}
/* no member is in a conference yet, so we find a free one
*/
memset(freeunits, 1, sizeof(freeunits));
list_for_each_entry(dsp, &dsp_obj.ilist, list) {
/* dsp must be on the same chip */
if (dsp->features.hfc_id==same_hfc
/* dsp must have joined a HW conference */
&& dsp->hfc_conf>=0
/* slot must be within range */
&& dsp->hfc_conf<8)
freeunits[dsp->hfc_conf] = 0;
}
i = 0;
ii = 8;
while(i < ii) {
if (freeunits[i])
break;
i++;
}
if (i == ii) {
/* no more conferences available */
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s conference %d cannot be formed, because no conference number free\n", __FUNCTION__, conf->id);
goto conf_software;
}
/* join all members */
current_conf = i;
goto join_members;
}
/*
* conf_id != 0: join or change conference
* conf_id == 0: split from conference if not already
*/
int
dsp_cmx_conf(dsp_t *dsp, u32 conf_id)
{
int err;
conference_t *conf;
/* if conference doesn't change */
if (dsp->conf_id == conf_id)
return(0);
spin_lock(&dsp->feature_lock);
if (dsp->feature_state != FEAT_STATE_RECEIVED) {
dsp->queue_conf_id=conf_id;
spin_unlock(&dsp->feature_lock);
return 0;
}
spin_unlock(&dsp->feature_lock);
/* first remove us from current conf */
if (dsp->conf_id) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "removing us from conference %d\n",
dsp->conf->id);
/* remove us from conf */
conf = dsp->conf;
err = dsp_cmx_del_conf_member(dsp);
if (err)
return(err);
dsp->conf_id = 0;
/* update hardware */
dsp_cmx_hardware(NULL, dsp);
/* conf now empty? */
if (list_empty(&conf->mlist)) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "conference is empty, so we remove it.\n");
err = dsp_cmx_del_conf(conf);
if (err)
return(err);
} else {
/* update members left on conf */
dsp_cmx_hardware(conf, NULL);
}
}
/* if split */
if (!conf_id)
return(0);
/* now add us to conf */
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "searching conference %d\n",
conf_id);
conf = dsp_cmx_search_conf(conf_id);
if (!conf) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "conference doesn't exist yet, creating.\n");
/* the conference doesn't exist, so we create */
conf = dsp_cmx_new_conf(conf_id);
if (!conf)
return(-EINVAL);
}
/* add conference member */
err = dsp_cmx_add_conf_member(dsp, conf);
if (err)
return(err);
dsp->conf_id = conf_id;
/* if we are alone, we do nothing! */
if (list_empty(&conf->mlist)) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "we are alone in this conference, so exit.\n");
/* update hardware */
dsp_cmx_hardware(NULL, dsp);
return(0);
}
/* update members on conf */
dsp_cmx_hardware(conf, NULL);
return(0);
}
/*
* audio data is received from card
*/
void
dsp_cmx_receive(dsp_t *dsp, struct sk_buff *skb)
{
// s32 *c;
u8 *d, *p;
int len = skb->len;
mISDN_head_t *hh = mISDN_HEAD_P(skb);
int w, i, ii;
// int direct = 0; /* use rx data to clock tx-data */
/* check if we have sompen */
if (len < 1)
return;
#if 0
/* check if we can use our clock and directly forward data */
if (!dsp->features.has_jitter) {
if (!conf)
direct = 1;
else {
if (count_list_member(&conf->mlist) <= 2)
direct = 1;
}
}
#endif
/* half of the buffer should be larger than maximum packet size */
if (len >= CMX_BUFF_HALF) {
printk(KERN_ERR "%s line %d: packet from card is too large (%d bytes). please make card send smaller packets OR increase CMX_BUFF_SIZE\n", __FILE__, __LINE__, len);
return;
}
/* initialize pointers if not already */
if (dsp->rx_W < 0) {
if (dsp->features.has_jitter)
dsp->rx_R = dsp->rx_W = (hh->dinfo & CMX_BUFF_MASK);
else
dsp->rx_R = dsp->rx_W = 0;
} else {
if (dsp->features.has_jitter) {
dsp->rx_W = (hh->dinfo & CMX_BUFF_MASK);
}
/* if we underrun (or maybe overrun), we set our new read pointer, and write silence to buffer */
if (((dsp->rx_W-dsp->rx_R) & CMX_BUFF_MASK) >= CMX_BUFF_HALF) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "cmx_receive(dsp=%lx): UNDERRUN (or overrun), adjusting read pointer! (inst %s)\n", (u_long)dsp, dsp->inst.name);
dsp->rx_R = dsp->rx_W;
memset(dsp->rx_buff, dsp_silence, sizeof(dsp->rx_buff));
}
}
/* show where to write */
#ifdef CMX_DEBUG
printk( KERN_DEBUG "cmx_receive(dsp=%lx): rx_R(dsp) rx_W(dsp)=%05x len=%d %s\n", (u_long)dsp, dsp->rx_R, dsp->rx_W, len, dsp->inst.name);
#endif
/* write data into rx_buffer */
p = skb->data;
d = dsp->rx_buff;
w = dsp->rx_W;
i = 0;
ii = len;
while(i < ii) {
d[w++ & CMX_BUFF_MASK] = *p++;
i++;
}
/* increase write-pointer */
dsp->rx_W = ((dsp->rx_W+len) & CMX_BUFF_MASK);
}
/*
* send (mixed) audio data to card and control jitter
*/
static void
dsp_cmx_send_member(dsp_t *dsp, int len, s32 *c, int members)
{
int dinfo = 0;
conference_t *conf = dsp->conf;
dsp_t *member, *other;
register s32 sample;
u8 *d, *p, *q, *o_q;
struct sk_buff *nskb;
int r, rr, t, tt, o_r, o_rr;
/* don't process if: */
if (dsp->pcm_slot_tx >= 0 /* connected to pcm slot */
&& dsp->tx_R == dsp->tx_W /* AND no tx-data */
&& !(dsp->tone.tone && dsp->tone.software)) /* AND not soft tones */
return;
if (!dsp->b_active) /* if not active */
return;
// NOTE: The following is not good, because we MUST send transmit data or
// software tones during pcm brige. (The condition above expresses this
// exactly. The card driver MUST disable bridging if data is in TX-
// fifo, to allow temporarily transmit tones until fifo is empty again.
#if 0
/* If we have 2 members and we are connected to pcm_slot, it looks
like we're bridged on the pcm, so why should we send anything ?
*/
if ( members==2 && (dsp->features.pcm_id>=0) &&
(dsp->pcm_slot_tx>=0) && (dsp->pcm_slot_rx>=0) ) {
return;
}
#endif
#ifdef CMX_DEBUG
printk(KERN_DEBUG "SEND members=%d dsp=%s, conf=%p, rx_R=%05x rx_W=%05x\n", members, dsp->inst.name, conf, dsp->rx_R, dsp->rx_W);
#endif
/* PREPARE RESULT */
nskb = alloc_skb(len, GFP_ATOMIC);
if (!nskb) {
printk(KERN_ERR "FATAL ERROR in mISDN_dsp.o: cannot alloc %d bytes\n", len);
return;
}
mISDN_sethead(PH_DATA | REQUEST, dinfo, nskb);
/* set pointers, indexes and stuff */
member = dsp;
p = dsp->tx_buff; /* transmit data */
q = dsp->rx_buff; /* received data */
d = skb_put(nskb, len); /* result */
t = dsp->tx_R; /* tx-pointers */
tt = dsp->tx_W;
r = dsp->rx_R; /* rx-pointers */
rr = (r + len) & CMX_BUFF_MASK;
/* PROCESS TONES/TX-DATA ONLY */
if (dsp->tone.tone && dsp->tone.software) {
/* -> copy tone */
dsp_tone_copy(dsp, d, len);
dsp->tx_R = dsp->tx_W = 0; /* clear tx buffer */
goto send_packet;
}
/* if we have tx-data but do not use mixing */
if (!dsp->tx_mix && t!=tt) {
/* -> send tx-data and continue when not enough */
while(r!=rr && t!=tt) {
*d++ = p[t]; /* write tx_buff */
t = (t+1) & CMX_BUFF_MASK;
r = (r+1) & CMX_BUFF_MASK;
}
if(r == rr) {
dsp->tx_R = t;
goto send_packet;
}
}
/* PROCESS DATA (one member / no conf) */
if (!conf || members<=1) {
/* -> if echo is NOT enabled */
if (!dsp->echo) {
/* -> send tx-data if available or use 0-volume */
while(r!=rr && t!=tt) {
*d++ = p[t]; /* write tx_buff */
t = (t+1) & CMX_BUFF_MASK;
r = (r+1) & CMX_BUFF_MASK;
}
if(r != rr)
memset(d, dsp_silence, (rr-r)&CMX_BUFF_MASK);
/* -> if echo is enabled */
} else {
/* -> mix tx-data with echo if available, or use echo only */
while(r!=rr && t!=tt) {
*d++ = dsp_audio_mix_law[(p[t]<<8)|q[r]];
t = (t+1) & CMX_BUFF_MASK;
r = (r+1) & CMX_BUFF_MASK;
}
while(r != rr) {
*d++ = q[r]; /* echo */
r = (r+1) & CMX_BUFF_MASK;
}
}
dsp->tx_R = t;
goto send_packet;
}
/* PROCESS DATA (two members) */
#ifdef CMX_CONF_DEBUG
if (0) {
#else
if (members == 2) {
#endif
/* "other" becomes other party */
other = (list_entry(conf->mlist.next, conf_member_t, list))->dsp;
if (other == member)
other = (list_entry(conf->mlist.prev, conf_member_t, list))->dsp;
o_q = other->rx_buff; /* received data */
o_r = other->rx_R; /* rx-pointers */
o_rr = (o_r + len) & CMX_BUFF_MASK;
/* -> if echo is NOT enabled */
if (!dsp->echo) {
//if (o_r!=o_rr) printk(KERN_DEBUG "receive data=0x%02x\n", o_q[o_r]); else printk(KERN_DEBUG "NO R!!!\n");
/* -> copy other member's rx-data, if tx-data is available, mix */
while(o_r!=o_rr && t!=tt) {
*d++ = dsp_audio_mix_law[(p[t]<<8)|o_q[o_r]];
t = (t+1) & CMX_BUFF_MASK;
o_r = (o_r+1) & CMX_BUFF_MASK;
}
while(o_r != o_rr) {
*d++ = o_q[o_r];
o_r = (o_r+1) & CMX_BUFF_MASK;
}
/* -> if echo is enabled */
} else {
/* -> mix other member's rx-data with echo, if tx-data is available, mix */
while(r!=rr && t!=tt) {
sample = dsp_audio_law_to_s32[p[t]] + dsp_audio_law_to_s32[q[r]] + dsp_audio_law_to_s32[o_q[o_r]];
if (sample < -32768)
sample = -32768;
else if (sample > 32767)
sample = 32767;
*d++ = dsp_audio_s16_to_law[sample & 0xffff]; /* tx-data + rx_data + echo */
t = (t+1) & CMX_BUFF_MASK;
r = (r+1) & CMX_BUFF_MASK;
o_r = (o_r+1) & CMX_BUFF_MASK;
}
while(r != rr) {
*d++ = dsp_audio_mix_law[(q[r]<<8)|o_q[o_r]];
r = (r+1) & CMX_BUFF_MASK;
o_r = (o_r+1) & CMX_BUFF_MASK;
}
}
dsp->tx_R = t;
goto send_packet;
}
/* PROCESS DATA (three or more members) */
/* -> if echo is NOT enabled */
if (!dsp->echo) {
/* -> substract rx-data from conf-data, if tx-data is available, mix */
while(r!=rr && t!=tt) {
sample = dsp_audio_law_to_s32[p[t]] + *c++ - dsp_audio_law_to_s32[q[r]];
if (sample < -32768)
sample = -32768;
else if (sample > 32767)
sample = 32767;
*d++ = dsp_audio_s16_to_law[sample & 0xffff]; /* conf-rx+tx */
r = (r+1) & CMX_BUFF_MASK;
t = (t+1) & CMX_BUFF_MASK;
}
while(r != rr) {
sample = *c++ - dsp_audio_law_to_s32[q[r]];
if (sample < -32768)
sample = -32768;
else if (sample > 32767)
sample = 32767;
*d++ = dsp_audio_s16_to_law[sample & 0xffff]; /* conf-rx */
r = (r+1) & CMX_BUFF_MASK;
}
/* -> if echo is enabled */
} else {
/* -> encode conf-data, if tx-data is available, mix */
while(r!=rr && t!=tt) {
sample = dsp_audio_law_to_s32[p[t]] + *c++;
if (sample < -32768)
sample = -32768;
else if (sample > 32767)
sample = 32767;
*d++ = dsp_audio_s16_to_law[sample & 0xffff]; /* conf(echo)+tx */
t = (t+1) & CMX_BUFF_MASK;
r = (r+1) & CMX_BUFF_MASK;
}
while(r != rr) {
sample = *c++;
if (sample < -32768)
sample = -32768;
else if (sample > 32767)
sample = 32767;
*d++ = dsp_audio_s16_to_law[sample & 0xffff]; /* conf(echo) */
r = (r+1) & CMX_BUFF_MASK;
}
}
dsp->tx_R = t;
goto send_packet;
send_packet:
/* adjust volume */
if (dsp->tx_volume)
dsp_change_volume(nskb, dsp->tx_volume);
/* cancel echo */
if (dsp->cancel_enable)
dsp_cancel_tx(dsp, nskb->data, nskb->len);
/* crypt */
if (dsp->bf_enable)
dsp_bf_encrypt(dsp, nskb->data, nskb->len);
/* send packet */
if (mISDN_queue_down(&dsp->inst, 0, nskb)) {
dev_kfree_skb(nskb);
printk(KERN_ERR "%s: failed to send tx-packet\n", __FUNCTION__);
}
}
u32 samplecount;
struct timer_list dsp_spl_tl;
u64 dsp_spl_jiffies;
void dsp_cmx_send(void *data)
{
conference_t *conf;
conf_member_t *member;
dsp_t *dsp;
int mustmix, members;
s32 mixbuffer[MAX_POLL], *c;
u8 *q;
int r, rr;
int jittercheck = 0, delay, i;
u_long flags;
/* lock */
spin_lock_irqsave(&dsp_obj.lock, flags);
/* check if jitter needs to be checked */
samplecount += dsp_poll;
if (samplecount%8000 < dsp_poll)
jittercheck = 1;
/* loop all members that do not require conference mixing */
list_for_each_entry(dsp, &dsp_obj.ilist, list) {
conf = dsp->conf;
mustmix = 0;
members = 0;
if (conf) {
members = count_list_member(&conf->mlist);
#ifdef CMX_CONF_DEBUG
if (conf->software && members>1)
#else
if (conf->software && members>2)
#endif
mustmix = 1;
}
/* transmission required */
if (!mustmix)
dsp_cmx_send_member(dsp, dsp_poll, mixbuffer, members); // unused mixbuffer is given to prevent a potential null-pointer-bug
}
/* loop all members that require conference mixing */
list_for_each_entry(conf, &Conf_list, list) {
/* count members and check hardware */
members = count_list_member(&conf->mlist);
#ifdef CMX_CONF_DEBUG
if (conf->software && members>1) {
#else
if (conf->software && members>2) {
#endif
/* mix all data */
memset(mixbuffer, 0, dsp_poll*sizeof(s32));
list_for_each_entry(member, &conf->mlist, list) {
dsp = member->dsp;
/* get range of data to mix */
c = mixbuffer;
q = dsp->rx_buff;
r = dsp->rx_R;
rr = (r + dsp_poll) & CMX_BUFF_MASK;
/* add member's data */
while(r != rr) {
*c++ += dsp_audio_law_to_s32[q[r]];
r = (r+1) & CMX_BUFF_MASK;
}
}
/* process each member */
list_for_each_entry(member, &conf->mlist, list) {
/* transmission */
dsp_cmx_send_member(member->dsp, dsp_poll, mixbuffer, members);
}
}
}
/* delete rx-data, increment buffers, change pointers */
list_for_each_entry(dsp, &dsp_obj.ilist, list) {
q = dsp->rx_buff;
r = dsp->rx_R;
rr = (r + dsp_poll) & CMX_BUFF_MASK;
/* delete rx-data */
while(r != rr) {
q[r] = dsp_silence;
r = (r+1) & CMX_BUFF_MASK;
}
/* increment rx-buffer pointer */
dsp->rx_R = r; /* write incremented read pointer */
/* check current delay */
delay = (dsp->rx_W-r) & CMX_BUFF_MASK;
if (delay >= CMX_BUFF_HALF)
delay = 0; /* will be the delay before next write */
/* check for lower delay */
if (delay < dsp->delay[0])
dsp->delay[0] = delay;
if (jittercheck) {
/* find the lowest of all delays */
delay = dsp->delay[0];
i = 1;
while (i < MAX_SECONDS_JITTER_CHECK) {
if (delay > dsp->delay[i])
delay = dsp->delay[i];
i++;
}
/* remove delay */
if (delay) {
if (dsp_debug & DEBUG_DSP_CMX)
printk(KERN_DEBUG "%s lowest delay of %d bytes for dsp %s are now removed.\n", __FUNCTION__, delay, dsp->inst.name);
r = dsp->rx_R;
rr = (r + delay) & CMX_BUFF_MASK;
/* delete rx-data */
while(r != rr) {
q[r] = dsp_silence;
r = (r+1) & CMX_BUFF_MASK;
}
/* increment rx-buffer pointer */
dsp->rx_R = r; /* write incremented read pointer */
}
/* scroll up delays */
i = MAX_SECONDS_JITTER_CHECK - 1;
while (i) {
dsp->delay[i] = dsp->delay[i-1];
i--;
}
dsp->delay[0] = CMX_BUFF_HALF; /* (infinite) delay */
}
}
/* restart timer */
// init_timer(&dsp_spl_tl);
if (dsp_spl_jiffies + dsp_tics < jiffies) /* if next event would be in the past ... */
dsp_spl_jiffies = jiffies;
else
dsp_spl_jiffies += dsp_tics;
dsp_spl_tl.expires = dsp_spl_jiffies;
add_timer(&dsp_spl_tl);
/* unlock */
spin_unlock_irqrestore(&dsp_obj.lock, flags);
}
/*
* audio data is transmitted from upper layer to the dsp
*/
void
dsp_cmx_transmit(dsp_t *dsp, struct sk_buff *skb)
{
u_int w, ww;
u8 *d, *p;
int space, l;
/* check if we have sompen */
l = skb->len;
if (l < 1)
return;
/* check if there is enough space, and then copy */
w = dsp->tx_W;
ww = dsp->tx_R;
p = dsp->tx_buff;
d = skb->data;
space = ww-w;
if (space <= 0)
space += CMX_BUFF_SIZE;
/* write-pointer should not overrun nor reach read pointer */
if (space-1 < skb->len)
/* write to the space we have left */
ww = (ww - 1) & CMX_BUFF_MASK;
else
/* write until all byte are copied */
ww = (w + skb->len) & CMX_BUFF_MASK;
dsp->tx_W = ww;
/* show current buffer */
#ifdef CMX_DEBUG
printk(KERN_DEBUG "cmx_transmit(dsp=%lx) %d bytes to 0x%x-0x%x. %s\n", (u_long)dsp, (ww-w)&CMX_BUFF_MASK, w, ww, dsp->inst.name);
#endif
/* copy transmit data to tx-buffer */
while(w != ww) {
p[w]= *d++;
w = (w+1) & CMX_BUFF_MASK;
}
return;
}
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