diff options
Diffstat (limited to 'drivers/isdn/mISDN/dsp_cmx.c')
| -rw-r--r-- | drivers/isdn/mISDN/dsp_cmx.c | 1949 |
1 files changed, 1949 insertions, 0 deletions
diff --git a/drivers/isdn/mISDN/dsp_cmx.c b/drivers/isdn/mISDN/dsp_cmx.c new file mode 100644 index 0000000000..61cb45c5d0 --- /dev/null +++ b/drivers/isdn/mISDN/dsp_cmx.c @@ -0,0 +1,1949 @@ +/* + * 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 struct dsp_conf which has one or more members in a chain + * of struct dsp_conf_member. + * + * 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 struct dsp_conf 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. + * Additionally a dynamic dejittering can be enabled. this allows data from + * user space that have jitter and different clock source. + * + * + * 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 usable clock due to jitter or packet loss (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 disabled 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/slab.h> +#include <linux/delay.h> +#include <linux/mISDNif.h> +#include <linux/mISDNdsp.h> +#include "core.h" +#include "dsp.h" +/* + * debugging of multi party conference, + * by using conference even with two members + */ + +/* #define CMX_CONF_DEBUG */ + +/*#define CMX_DEBUG * massive read/write pointer output */ +/*#define CMX_DELAY_DEBUG * gives rx-buffer delay overview */ +/*#define CMX_TX_DEBUG * massive read/write on tx-buffer with content */ + +/* + * debug cmx memory structure + */ +void +dsp_cmx_debug(struct dsp *dsp) +{ + struct dsp_conf *conf; + struct dsp_conf_member *member; + struct dsp *odsp; + + printk(KERN_DEBUG "-----Current DSP\n"); + list_for_each_entry(odsp, &dsp_ilist, list) { + printk(KERN_DEBUG "* %s hardecho=%d softecho=%d txmix=%d", + odsp->name, odsp->echo.hardware, odsp->echo.software, + 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_ilist, 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 " + "tx_data %d rx_is_off %d)%s\n", + member->dsp->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->tx_data, member->dsp->rx_is_off, + (member->dsp == dsp) ? " *this*" : ""); + } + } + printk(KERN_DEBUG "-----end\n"); +} + +/* + * search conference + */ +static struct dsp_conf * +dsp_cmx_search_conf(u32 id) +{ + struct dsp_conf *conf; + + if (!id) { + printk(KERN_WARNING "%s: conference ID is 0.\n", __func__); + return NULL; + } + + /* search conference */ + list_for_each_entry(conf, &conf_ilist, list) + if (conf->id == id) + return conf; + + return NULL; +} + + +/* + * add member to conference + */ +static int +dsp_cmx_add_conf_member(struct dsp *dsp, struct dsp_conf *conf) +{ + struct dsp_conf_member *member; + + if (!conf || !dsp) { + printk(KERN_WARNING "%s: conf or dsp is 0.\n", __func__); + return -EINVAL; + } + if (dsp->member) { + printk(KERN_WARNING "%s: dsp is already member in a conf.\n", + __func__); + return -EINVAL; + } + + if (dsp->conf) { + printk(KERN_WARNING "%s: dsp is already in a conf.\n", + __func__); + return -EINVAL; + } + + member = kzalloc(sizeof(struct dsp_conf_member), GFP_ATOMIC); + if (!member) { + printk(KERN_ERR "kzalloc struct dsp_conf_member failed\n"); + return -ENOMEM; + } + member->dsp = dsp; + /* clear rx buffer */ + memset(dsp->rx_buff, dsp_silence, sizeof(dsp->rx_buff)); + dsp->rx_init = 1; /* rx_W and rx_R will be adjusted on first frame */ + dsp->rx_W = 0; + dsp->rx_R = 0; + + 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(struct dsp *dsp) +{ + struct dsp_conf_member *member; + + if (!dsp) { + printk(KERN_WARNING "%s: dsp is 0.\n", + __func__); + return -EINVAL; + } + + if (!dsp->conf) { + printk(KERN_WARNING "%s: dsp is not in a conf.\n", + __func__); + return -EINVAL; + } + + if (list_empty(&dsp->conf->mlist)) { + printk(KERN_WARNING "%s: dsp has linked an empty conf.\n", + __func__); + 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_member list.\n", + __func__); + + return -EINVAL; +} + + +/* + * new conference + */ +static struct dsp_conf +*dsp_cmx_new_conf(u32 id) +{ + struct dsp_conf *conf; + + if (!id) { + printk(KERN_WARNING "%s: id is 0.\n", + __func__); + return NULL; + } + + conf = kzalloc(sizeof(struct dsp_conf), GFP_ATOMIC); + if (!conf) { + printk(KERN_ERR "kzalloc struct dsp_conf failed\n"); + return NULL; + } + INIT_LIST_HEAD(&conf->mlist); + conf->id = id; + + list_add_tail(&conf->list, &conf_ilist); + + return conf; +} + + +/* + * del conference + */ +int +dsp_cmx_del_conf(struct dsp_conf *conf) +{ + if (!conf) { + printk(KERN_WARNING "%s: conf is null.\n", + __func__); + return -EINVAL; + } + + if (!list_empty(&conf->mlist)) { + printk(KERN_WARNING "%s: conf not empty.\n", + __func__); + return -EINVAL; + } + list_del(&conf->list); + kfree(conf); + + return 0; +} + + +/* + * send HW message to hfc card + */ +static void +dsp_cmx_hw_message(struct dsp *dsp, u32 message, u32 param1, u32 param2, + u32 param3, u32 param4) +{ + struct mISDN_ctrl_req cq; + + memset(&cq, 0, sizeof(cq)); + cq.op = message; + cq.p1 = param1 | (param2 << 8); + cq.p2 = param3 | (param4 << 8); + if (dsp->ch.peer) + dsp->ch.peer->ctrl(dsp->ch.peer, CONTROL_CHANNEL, &cq); +} + + +/* + * 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(struct dsp_conf *conf, struct dsp *dsp) +{ + struct dsp_conf_member *member, *nextm; + struct dsp *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, tx_data = 0; + + /* dsp gets updated (no conf) */ + if (!conf) { + if (!dsp) + return; + if (dsp_debug & DEBUG_DSP_CMX) + printk(KERN_DEBUG "%s checking dsp %s\n", + __func__, dsp->name); + 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", __func__, + dsp->name, dsp->hfc_conf); + dsp_cmx_hw_message(dsp, MISDN_CTRL_HFC_CONF_SPLIT, + 0, 0, 0, 0); + dsp->hfc_conf = -1; + } + /* process hw echo */ + if (dsp->features.pcm_banks < 1) + return; + if (!dsp->echo.software && !dsp->echo.hardware) { + /* 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", + __func__, dsp->name, + dsp->pcm_slot_tx, dsp->pcm_slot_rx); + dsp_cmx_hw_message(dsp, MISDN_CTRL_HFC_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 is enabled, find out if we use soft or hardware */ + dsp->echo.software = dsp->tx_data; + dsp->echo.hardware = 0; + /* ECHO: already echo */ + if (dsp->pcm_slot_tx >= 0 && dsp->pcm_slot_rx < 0 && + dsp->pcm_bank_tx == 2 && dsp->pcm_bank_rx == 2) { + dsp->echo.hardware = 1; + 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; /* 2 means loop */ + dsp->pcm_bank_rx = 2; + if (dsp_debug & DEBUG_DSP_CMX) + printk(KERN_DEBUG + "%s refresh %s for echo using slot %d\n", + __func__, dsp->name, + dsp->pcm_slot_tx); + dsp_cmx_hw_message(dsp, MISDN_CTRL_HFC_PCM_CONN, + dsp->pcm_slot_tx, 2, dsp->pcm_slot_rx, 2); + dsp->echo.hardware = 1; + 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_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_rx] = 0; + if (finddsp->pcm_slot_tx >= 0 && + finddsp->pcm_slot_tx < sizeof(freeslots)) + freeslots[finddsp->pcm_slot_tx] = 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", + __func__); + /* no more slots available */ + dsp->echo.software = 1; + 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", + __func__, dsp->name, dsp->pcm_slot_tx); + dsp_cmx_hw_message(dsp, MISDN_CTRL_HFC_PCM_CONN, + dsp->pcm_slot_tx, 2, dsp->pcm_slot_rx, 2); + dsp->echo.hardware = 1; + return; + } + + /* conf gets updated (all members) */ + if (dsp_debug & DEBUG_DSP_CMX) + printk(KERN_DEBUG "%s checking conference %d\n", + __func__, conf->id); + + if (list_empty(&conf->mlist)) { + printk(KERN_ERR "%s: conference without members\n", + __func__); + return; + } + member = list_entry(conf->mlist.next, struct dsp_conf_member, 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", __func__, + member->dsp->name); + conf_software: + 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", + __func__, + dsp->name, + dsp->hfc_conf); + dsp_cmx_hw_message(dsp, + MISDN_CTRL_HFC_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", + __func__, + dsp->name, + dsp->pcm_slot_tx, + dsp->pcm_slot_rx); + dsp_cmx_hw_message(dsp, + MISDN_CTRL_HFC_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.hardware || member->dsp->echo.software) { + if (dsp_debug & DEBUG_DSP_CMX) + printk(KERN_DEBUG + "%s dsp %s cannot form a conf, because " + "echo is turned on\n", __func__, + member->dsp->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", + __func__, member->dsp->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", + __func__, member->dsp->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", + __func__, member->dsp->name); + goto conf_software; + } + /* check if tx-data turned on */ + if (member->dsp->tx_data) { + if (dsp_debug & DEBUG_DSP_CMX) + printk(KERN_DEBUG + "%s dsp %s tx_data is turned on\n", + __func__, member->dsp->name); + tx_data = 1; + } + /* check if pipeline exists */ + if (member->dsp->pipeline.inuse) { + if (dsp_debug & DEBUG_DSP_CMX) + printk(KERN_DEBUG + "%s dsp %s cannot form a conf, because " + "pipeline exists\n", __func__, + member->dsp->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", + __func__, member->dsp->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", + __func__, member->dsp->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", + __func__, member->dsp->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", __func__, conf->id); + conf->hardware = 0; + conf->software = 0; + member = list_entry(conf->mlist.next, struct dsp_conf_member, + 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, struct dsp_conf_member, + list); + nextm = list_entry(member->list.next, struct dsp_conf_member, + 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", + __func__, member->dsp->name, + member->dsp->hfc_conf); + dsp_cmx_hw_message(member->dsp, + MISDN_CTRL_HFC_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", + __func__, nextm->dsp->name, + nextm->dsp->hfc_conf); + dsp_cmx_hw_message(nextm->dsp, + MISDN_CTRL_HFC_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", + __func__, + member->dsp->name, + nextm->dsp->name, + member->dsp->pcm_slot_tx, + member->dsp->pcm_bank_tx, + member->dsp->pcm_bank_rx); + conf->hardware = 1; + conf->software = tx_data; + return; + } + /* find a new slot */ + memset(freeslots, 1, sizeof(freeslots)); + list_for_each_entry(dsp, &dsp_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_rx] = 0; + if (dsp->pcm_slot_tx >= 0 && + dsp->pcm_slot_tx < + sizeof(freeslots)) + freeslots[dsp->pcm_slot_tx] = 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", __func__, + member->dsp->name, + nextm->dsp->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", + __func__, + member->dsp->name, + nextm->dsp->name, + member->dsp->pcm_slot_tx); + dsp_cmx_hw_message(member->dsp, MISDN_CTRL_HFC_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, MISDN_CTRL_HFC_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 = tx_data; + 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", __func__, + member->dsp->name, + nextm->dsp->name, + member->dsp->pcm_slot_tx, + member->dsp->pcm_slot_rx); + conf->hardware = 1; + conf->software = tx_data; + return; + } + /* find two new slot */ + memset(freeslots, 1, sizeof(freeslots)); + list_for_each_entry(dsp, &dsp_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_rx] = 0; + if (dsp->pcm_slot_tx >= 0 && + dsp->pcm_slot_tx < + sizeof(freeslots)) + freeslots[dsp->pcm_slot_tx] = 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", __func__, + member->dsp->name, + nextm->dsp->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", + __func__, + member->dsp->name, + nextm->dsp->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", __func__, + member->dsp->name, + nextm->dsp->name, + member->dsp->pcm_slot_tx, + member->dsp->pcm_slot_rx); + dsp_cmx_hw_message(member->dsp, MISDN_CTRL_HFC_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, MISDN_CTRL_HFC_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 = tx_data; + 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", + __func__, conf->id); + goto conf_software; + } + + /* for more than two members.. */ + + /* if all members already have the same conference */ + if (all_conf) { + conf->hardware = 1; + conf->software = tx_data; + 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) { + /* if no conference engine on our chip, change to + * software */ + if (!member->dsp->features.hfc_conf) + goto conf_software; + /* in case of hdlc, change to software */ + if (member->dsp->hdlc) + goto conf_software; + /* 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_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", + __func__, 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", __func__, + member->dsp->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, MISDN_CTRL_HFC_PCM_CONN, + i, 2, i, 2); + dsp_cmx_hw_message(member->dsp, + MISDN_CTRL_HFC_CONF_JOIN, current_conf, 0, 0, 0); + } + conf->hardware = 1; + conf->software = tx_data; + 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_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", + __func__, 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(struct dsp *dsp, u32 conf_id) +{ + int err; + struct dsp_conf *conf; + struct dsp_conf_member *member; + + /* if conference doesn't change */ + if (dsp->conf_id == conf_id) + return 0; + + /* 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; + } else if (!list_empty(&conf->mlist)) { + member = list_entry(conf->mlist.next, struct dsp_conf_member, + list); + if (dsp->hdlc && !member->dsp->hdlc) { + if (dsp_debug & DEBUG_DSP_CMX) + printk(KERN_DEBUG + "cannot join transparent conference.\n"); + return -EINVAL; + } + if (!dsp->hdlc && member->dsp->hdlc) { + if (dsp_debug & DEBUG_DSP_CMX) + printk(KERN_DEBUG + "cannot join hdlc conference.\n"); + 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; +} + +#ifdef CMX_DELAY_DEBUG +int delaycount; +static void +showdelay(struct dsp *dsp, int samples, int delay) +{ + char bar[] = "--------------------------------------------------|"; + int sdelay; + + delaycount += samples; + if (delaycount < 8000) + return; + delaycount = 0; + + sdelay = delay * 50 / (dsp_poll << 2); + + printk(KERN_DEBUG "DELAY (%s) %3d >%s\n", dsp->name, delay, + sdelay > 50 ? "..." : bar + 50 - sdelay); +} +#endif + +/* + * audio data is received from card + */ +void +dsp_cmx_receive(struct dsp *dsp, struct sk_buff *skb) +{ + u8 *d, *p; + int len = skb->len; + struct mISDNhead *hh = mISDN_HEAD_P(skb); + int w, i, ii; + + /* check if we have sompen */ + if (len < 1) + return; + + /* 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 - + * also add delay if requested by PH_SIGNAL + */ + if (dsp->rx_init) { + dsp->rx_init = 0; + if (dsp->features.unordered) { + dsp->rx_R = (hh->id & CMX_BUFF_MASK); + if (dsp->cmx_delay) + dsp->rx_W = (dsp->rx_R + dsp->cmx_delay) + & CMX_BUFF_MASK; + else + dsp->rx_W = (dsp->rx_R + (dsp_poll >> 1)) + & CMX_BUFF_MASK; + } else { + dsp->rx_R = 0; + if (dsp->cmx_delay) + dsp->rx_W = dsp->cmx_delay; + else + dsp->rx_W = dsp_poll >> 1; + } + } + /* if frame contains time code, write directly */ + if (dsp->features.unordered) { + dsp->rx_W = (hh->id & CMX_BUFF_MASK); + /* printk(KERN_DEBUG "%s %08x\n", dsp->name, hh->id); */ + } + /* + * 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_CLOCK) + printk(KERN_DEBUG + "cmx_receive(dsp=%lx): UNDERRUN (or overrun the " + "maximum delay), adjusting read pointer! " + "(inst %s)\n", (u_long)dsp, dsp->name); + /* flush rx buffer and set delay to dsp_poll / 2 */ + if (dsp->features.unordered) { + dsp->rx_R = (hh->id & CMX_BUFF_MASK); + if (dsp->cmx_delay) + dsp->rx_W = (dsp->rx_R + dsp->cmx_delay) + & CMX_BUFF_MASK; + else + dsp->rx_W = (dsp->rx_R + (dsp_poll >> 1)) + & CMX_BUFF_MASK; + } else { + dsp->rx_R = 0; + if (dsp->cmx_delay) + dsp->rx_W = dsp->cmx_delay; + else + dsp->rx_W = dsp_poll >> 1; + } + memset(dsp->rx_buff, dsp_silence, sizeof(dsp->rx_buff)); + } + /* if we have reached double delay, jump back to middle */ + if (dsp->cmx_delay) + if (((dsp->rx_W - dsp->rx_R) & CMX_BUFF_MASK) >= + (dsp->cmx_delay << 1)) { + if (dsp_debug & DEBUG_DSP_CLOCK) + printk(KERN_DEBUG + "cmx_receive(dsp=%lx): OVERRUN (because " + "twice the delay is reached), adjusting " + "read pointer! (inst %s)\n", + (u_long)dsp, dsp->name); + /* flush buffer */ + if (dsp->features.unordered) { + dsp->rx_R = (hh->id & CMX_BUFF_MASK); + dsp->rx_W = (dsp->rx_R + dsp->cmx_delay) + & CMX_BUFF_MASK; + } else { + dsp->rx_R = 0; + dsp->rx_W = dsp->cmx_delay; + } + 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)=%05x rx_W(dsp)=%05x len=%d %s\n", + (u_long)dsp, dsp->rx_R, dsp->rx_W, len, dsp->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); +#ifdef CMX_DELAY_DEBUG + showdelay(dsp, len, (dsp->rx_W-dsp->rx_R) & CMX_BUFF_MASK); +#endif +} + + +/* + * send (mixed) audio data to card and control jitter + */ +static void +dsp_cmx_send_member(struct dsp *dsp, int len, s32 *c, int members) +{ + struct dsp_conf *conf = dsp->conf; + struct dsp *member, *other; + register s32 sample; + u8 *d, *p, *q, *o_q; + struct sk_buff *nskb, *txskb; + int r, rr, t, tt, o_r, o_rr; + int preload = 0; + struct mISDNhead *hh, *thh; + int tx_data_only = 0; + + /* don't process if: */ + if (!dsp->b_active) { /* if not active */ + dsp->last_tx = 0; + return; + } + if (((dsp->conf && dsp->conf->hardware) || /* hardware conf */ + dsp->echo.hardware) && /* OR hardware echo */ + dsp->tx_R == dsp->tx_W && /* AND no tx-data */ + !(dsp->tone.tone && dsp->tone.software)) { /* AND not soft tones */ + if (!dsp->tx_data) { /* no tx_data for user space required */ + dsp->last_tx = 0; + return; + } + if (dsp->conf && dsp->conf->software && dsp->conf->hardware) + tx_data_only = 1; + if (dsp->echo.software && dsp->echo.hardware) + tx_data_only = 1; + } + +#ifdef CMX_DEBUG + printk(KERN_DEBUG + "SEND members=%d dsp=%s, conf=%p, rx_R=%05x rx_W=%05x\n", + members, dsp->name, conf, dsp->rx_R, dsp->rx_W); +#endif + + /* preload if we have delay set */ + if (dsp->cmx_delay && !dsp->last_tx) { + preload = len; + if (preload < 128) + preload = 128; + } + + /* PREPARE RESULT */ + nskb = mI_alloc_skb(len + preload, GFP_ATOMIC); + if (!nskb) { + printk(KERN_ERR + "FATAL ERROR in mISDN_dsp.o: cannot alloc %d bytes\n", + len + preload); + return; + } + hh = mISDN_HEAD_P(nskb); + hh->prim = PH_DATA_REQ; + hh->id = 0; + dsp->last_tx = 1; + + /* set pointers, indexes and stuff */ + member = dsp; + p = dsp->tx_buff; /* transmit data */ + q = dsp->rx_buff; /* received data */ + d = skb_put(nskb, preload + len); /* result */ + t = dsp->tx_R; /* tx-pointers */ + tt = dsp->tx_W; + r = dsp->rx_R; /* rx-pointers */ + rr = (r + len) & CMX_BUFF_MASK; + + /* preload with silence, if required */ + if (preload) { + memset(d, dsp_silence, preload); + d += preload; + } + + /* PROCESS TONES/TX-DATA ONLY */ + if (dsp->tone.tone && dsp->tone.software) { + /* -> copy tone */ + dsp_tone_copy(dsp, d, len); + dsp->tx_R = 0; /* clear tx buffer */ + dsp->tx_W = 0; + 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 */ +#ifdef CMX_TX_DEBUG + sprintf(debugbuf, "TX sending (%04x-%04x)%p: ", t, tt, p); +#endif + while (r != rr && t != tt) { +#ifdef CMX_TX_DEBUG + if (strlen(debugbuf) < 48) + sprintf(debugbuf + strlen(debugbuf), " %02x", + p[t]); +#endif + *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; +#ifdef CMX_TX_DEBUG + printk(KERN_DEBUG "%s\n", debugbuf); +#endif + goto send_packet; + } + } +#ifdef CMX_TX_DEBUG + printk(KERN_DEBUG "%s\n", debugbuf); +#endif + + /* PROCESS DATA (one member / no conf) */ + if (!conf || members <= 1) { + /* -> if echo is NOT enabled */ + if (!dsp->echo.software) { + /* -> 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) { + if (dsp_debug & DEBUG_DSP_CLOCK) + printk(KERN_DEBUG "%s: RX empty\n", + __func__); + 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, + struct dsp_conf_member, list))->dsp; + if (other == member) + other = (list_entry(conf->mlist.prev, + struct dsp_conf_member, list))->dsp; + o_q = other->rx_buff; /* received data */ + o_rr = (other->rx_R + len) & CMX_BUFF_MASK; + /* end of rx-pointer */ + o_r = (o_rr - rr + r) & CMX_BUFF_MASK; + /* start rx-pointer at current read position*/ + /* -> if echo is NOT enabled */ + if (!dsp->echo.software) { + /* + * -> 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.software) { + /* + * -> subtract 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: + /* + * send tx-data if enabled - don't filter, + * because we want what we send, not what we filtered + */ + if (dsp->tx_data) { + if (tx_data_only) { + hh->prim = DL_DATA_REQ; + hh->id = 0; + /* queue and trigger */ + skb_queue_tail(&dsp->sendq, nskb); + schedule_work(&dsp->workq); + /* exit because only tx_data is used */ + return; + } else { + txskb = mI_alloc_skb(len, GFP_ATOMIC); + if (!txskb) { + printk(KERN_ERR + "FATAL ERROR in mISDN_dsp.o: " + "cannot alloc %d bytes\n", len); + } else { + thh = mISDN_HEAD_P(txskb); + thh->prim = DL_DATA_REQ; + thh->id = 0; + skb_put_data(txskb, nskb->data + preload, len); + /* queue (trigger later) */ + skb_queue_tail(&dsp->sendq, txskb); + } + } + } + + /* send data only to card, if we don't just calculated tx_data */ + /* adjust volume */ + if (dsp->tx_volume) + dsp_change_volume(nskb, dsp->tx_volume); + /* pipeline */ + if (dsp->pipeline.inuse) + dsp_pipeline_process_tx(&dsp->pipeline, nskb->data, + nskb->len); + /* crypt */ + if (dsp->bf_enable) + dsp_bf_encrypt(dsp, nskb->data, nskb->len); + /* queue and trigger */ + skb_queue_tail(&dsp->sendq, nskb); + schedule_work(&dsp->workq); +} + +static u32 jittercount; /* counter for jitter check */ +struct timer_list dsp_spl_tl; +unsigned long dsp_spl_jiffies; /* calculate the next time to fire */ +static u16 dsp_count; /* last sample count */ +static int dsp_count_valid; /* if we have last sample count */ + +void +dsp_cmx_send(struct timer_list *arg) +{ + struct dsp_conf *conf; + struct dsp_conf_member *member; + struct dsp *dsp; + int mustmix, members; + static s32 mixbuffer[MAX_POLL + 100]; + s32 *c; + u8 *p, *q; + int r, rr; + int jittercheck = 0, delay, i; + u_long flags; + u16 length, count; + + /* lock */ + spin_lock_irqsave(&dsp_lock, flags); + + if (!dsp_count_valid) { + dsp_count = mISDN_clock_get(); + length = dsp_poll; + dsp_count_valid = 1; + } else { + count = mISDN_clock_get(); + length = count - dsp_count; + dsp_count = count; + } + if (length > MAX_POLL + 100) + length = MAX_POLL + 100; + /* printk(KERN_DEBUG "len=%d dsp_count=0x%x\n", length, dsp_count); */ + + /* + * check if jitter needs to be checked (this is every second) + */ + jittercount += length; + if (jittercount >= 8000) { + jittercount -= 8000; + jittercheck = 1; + } + + /* loop all members that do not require conference mixing */ + list_for_each_entry(dsp, &dsp_ilist, list) { + if (dsp->hdlc) + continue; + conf = dsp->conf; + mustmix = 0; + members = 0; + if (conf) { + members = list_count_nodes(&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, length, 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_ilist, list) { + /* count members and check hardware */ + members = list_count_nodes(&conf->mlist); +#ifdef CMX_CONF_DEBUG + if (conf->software && members > 1) { +#else + if (conf->software && members > 2) { +#endif + /* check for hdlc conf */ + member = list_entry(conf->mlist.next, + struct dsp_conf_member, list); + if (member->dsp->hdlc) + continue; + /* mix all data */ + memset(mixbuffer, 0, length * 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 + length) & 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, length, + mixbuffer, members); + } + } + } + + /* delete rx-data, increment buffers, change pointers */ + list_for_each_entry(dsp, &dsp_ilist, list) { + if (dsp->hdlc) + continue; + p = dsp->rx_buff; + q = dsp->tx_buff; + r = dsp->rx_R; + /* move receive pointer when receiving */ + if (!dsp->rx_is_off) { + rr = (r + length) & CMX_BUFF_MASK; + /* delete rx-data */ + while (r != rr) { + p[r] = dsp_silence; + r = (r + 1) & CMX_BUFF_MASK; + } + /* increment rx-buffer pointer */ + dsp->rx_R = r; /* write incremented read pointer */ + } + + /* check current rx_delay */ + delay = (dsp->rx_W-dsp->rx_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->rx_delay[0]) + dsp->rx_delay[0] = delay; + /* check current tx_delay */ + delay = (dsp->tx_W-dsp->tx_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->tx_delay[0]) + dsp->tx_delay[0] = delay; + if (jittercheck) { + /* find the lowest of all rx_delays */ + delay = dsp->rx_delay[0]; + i = 1; + while (i < MAX_SECONDS_JITTER_CHECK) { + if (delay > dsp->rx_delay[i]) + delay = dsp->rx_delay[i]; + i++; + } + /* + * remove rx_delay only if we have delay AND we + * have not preset cmx_delay AND + * the delay is greater dsp_poll + */ + if (delay > dsp_poll && !dsp->cmx_delay) { + if (dsp_debug & DEBUG_DSP_CLOCK) + printk(KERN_DEBUG + "%s lowest rx_delay of %d bytes for" + " dsp %s are now removed.\n", + __func__, delay, + dsp->name); + r = dsp->rx_R; + rr = (r + delay - (dsp_poll >> 1)) + & CMX_BUFF_MASK; + /* delete rx-data */ + while (r != rr) { + p[r] = dsp_silence; + r = (r + 1) & CMX_BUFF_MASK; + } + /* increment rx-buffer pointer */ + dsp->rx_R = r; + /* write incremented read pointer */ + } + /* find the lowest of all tx_delays */ + delay = dsp->tx_delay[0]; + i = 1; + while (i < MAX_SECONDS_JITTER_CHECK) { + if (delay > dsp->tx_delay[i]) + delay = dsp->tx_delay[i]; + i++; + } + /* + * remove delay only if we have delay AND we + * have enabled tx_dejitter + */ + if (delay > dsp_poll && dsp->tx_dejitter) { + if (dsp_debug & DEBUG_DSP_CLOCK) + printk(KERN_DEBUG + "%s lowest tx_delay of %d bytes for" + " dsp %s are now removed.\n", + __func__, delay, + dsp->name); + r = dsp->tx_R; + rr = (r + delay - (dsp_poll >> 1)) + & CMX_BUFF_MASK; + /* delete tx-data */ + while (r != rr) { + q[r] = dsp_silence; + r = (r + 1) & CMX_BUFF_MASK; + } + /* increment rx-buffer pointer */ + dsp->tx_R = r; + /* write incremented read pointer */ + } + /* scroll up delays */ + i = MAX_SECONDS_JITTER_CHECK - 1; + while (i) { + dsp->rx_delay[i] = dsp->rx_delay[i - 1]; + dsp->tx_delay[i] = dsp->tx_delay[i - 1]; + i--; + } + dsp->tx_delay[0] = CMX_BUFF_HALF; /* (infinite) delay */ + dsp->rx_delay[0] = CMX_BUFF_HALF; /* (infinite) delay */ + } + } + + /* if next event would be in the past ... */ + if ((s32)(dsp_spl_jiffies + dsp_tics-jiffies) <= 0) + dsp_spl_jiffies = jiffies + 1; + else + dsp_spl_jiffies += dsp_tics; + + dsp_spl_tl.expires = dsp_spl_jiffies; + add_timer(&dsp_spl_tl); + + /* unlock */ + spin_unlock_irqrestore(&dsp_lock, flags); +} + +/* + * audio data is transmitted from upper layer to the dsp + */ +void +dsp_cmx_transmit(struct dsp *dsp, struct sk_buff *skb) +{ + u_int w, ww; + u8 *d, *p; + int space; /* todo: , l = skb->len; */ +#ifdef CMX_TX_DEBUG + char debugbuf[256] = ""; +#endif + + /* 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 - 1) & CMX_BUFF_MASK; + /* write-pointer should not overrun nor reach read pointer */ + if (space < skb->len) { + /* write to the space we have left */ + ww = (ww - 1) & CMX_BUFF_MASK; /* end one byte prior tx_R */ + if (dsp_debug & DEBUG_DSP_CLOCK) + printk(KERN_DEBUG "%s: TX overflow space=%d skb->len=" + "%d, w=0x%04x, ww=0x%04x\n", __func__, space, + skb->len, w, ww); + } 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->name); +#endif + + /* copy transmit data to tx-buffer */ +#ifdef CMX_TX_DEBUG + sprintf(debugbuf, "TX getting (%04x-%04x)%p: ", w, ww, p); +#endif + while (w != ww) { +#ifdef CMX_TX_DEBUG + if (strlen(debugbuf) < 48) + sprintf(debugbuf + strlen(debugbuf), " %02x", *d); +#endif + p[w] = *d++; + w = (w + 1) & CMX_BUFF_MASK; + } +#ifdef CMX_TX_DEBUG + printk(KERN_DEBUG "%s\n", debugbuf); +#endif + +} + +/* + * hdlc data is received from card and sent to all members. + */ +void +dsp_cmx_hdlc(struct dsp *dsp, struct sk_buff *skb) +{ + struct sk_buff *nskb = NULL; + struct dsp_conf_member *member; + struct mISDNhead *hh; + + /* not if not active */ + if (!dsp->b_active) + return; + + /* check if we have sompen */ + if (skb->len < 1) + return; + + /* no conf */ + if (!dsp->conf) { + /* in case of software echo */ + if (dsp->echo.software) { + nskb = skb_clone(skb, GFP_ATOMIC); + if (nskb) { + hh = mISDN_HEAD_P(nskb); + hh->prim = PH_DATA_REQ; + hh->id = 0; + skb_queue_tail(&dsp->sendq, nskb); + schedule_work(&dsp->workq); + } + } + return; + } + /* in case of hardware conference */ + if (dsp->conf->hardware) + return; + list_for_each_entry(member, &dsp->conf->mlist, list) { + if (dsp->echo.software || member->dsp != dsp) { + nskb = skb_clone(skb, GFP_ATOMIC); + if (nskb) { + hh = mISDN_HEAD_P(nskb); + hh->prim = PH_DATA_REQ; + hh->id = 0; + skb_queue_tail(&member->dsp->sendq, nskb); + schedule_work(&member->dsp->workq); + } + } + } +} |