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Last updated: Sat Feb 3 05:01:34 2007

Asterisk developer's documentation :: Codename Pineapple

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indications.c File Reference

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Detailed Description

Tone Management.

Author:

Pauline Middelink <middelink@polyware.nl>

This set of function allow us to play a list of tones on a channel. Each element has two frequencies, which are mixed together and a duration. For silence both frequencies can be set to 0. The playtones can be given as a comma separated string.

Definition in file indications.c.

#include "asterisk.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "asterisk/lock.h"
#include "asterisk/linkedlists.h"
#include "asterisk/indications.h"
#include "asterisk/frame.h"
#include "asterisk/options.h"
#include "asterisk/channel.h"
#include "asterisk/logger.h"
#include "asterisk/utils.h"

Include dependency graph for indications.c:

Go to the source code of this file.

Data Structures
struct	playtones_def
struct	playtones_item
struct	playtones_state
Functions
ind_tone_zone_sound *	ast_get_indication_tone (const struct ind_tone_zone *zone, const char *indication)
	locate a tone_zone_sound, given the tone_zone. if tone_zone == NULL, use the default tone_zone
ind_tone_zone *	ast_get_indication_zone (const char *country)
	locate tone_zone, given the country. if country == NULL, use the default country
int	ast_playtones_start (struct ast_channel *chan, int vol, const char *playlst, int interruptible)
	Start a tone-list going.
void	ast_playtones_stop (struct ast_channel *chan)
	Stop the tones from playing.
int	ast_register_indication (struct ind_tone_zone *zone, const char *indication, const char *tonelist)
	add a new indication to a tone_zone. tone_zone must exist. if the indication already exists, it will be replaced.
int	ast_register_indication_country (struct ind_tone_zone *zone)
	add a new country, if country exists, it will be replaced.
static	AST_RWLIST_HEAD_STATIC (tone_zones, ind_tone_zone)
int	ast_set_indication_country (const char *country)
	set the default tone country
int	ast_unregister_indication (struct ind_tone_zone *zone, const char *indication)
	remove an existing tone_zone's indication. tone_zone must exist
int	ast_unregister_indication_country (const char *country)
	remove an existing country and all its indications, country must exist
ind_tone_zone *	ast_walk_indications (const struct ind_tone_zone *cur)
	support for walking through a list of indications
static void	free_zone (struct ind_tone_zone *zone)
static void *	playtones_alloc (struct ast_channel *chan, void *params)
static int	playtones_generator (struct ast_channel *chan, void *data, int len, int samples)
static void	playtones_release (struct ast_channel *chan, void *params)
Variables
static struct ind_tone_zone *	current_tonezone
static int	midi_tohz [128]
static struct ast_generator	playtones

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Function Documentation

struct ind_tone_zone_sound* ast_get_indication_tone (  const struct ind_tone_zone *  zone, const char *  indication )

locate a tone_zone_sound, given the tone_zone. if tone_zone == NULL, use the default tone_zone Definition at line 423 of file indications.c. References AST_LIST_FIRST, AST_RWLIST_RDLOCK, AST_RWLIST_UNLOCK, current_tonezone, ind_tone_zone_sound::name, ind_tone_zone_sound::next, and ind_tone_zone::tones. Referenced by ast_app_dtget(), ast_indicate_data(), dialtone_indicate(), and handle_playtones(). { struct ind_tone_zone_sound *ts = NULL; AST_RWLIST_RDLOCK(&tone_zones); /* If no zone is already specified we need to try to pick one */ if (!zone) { if (current_tonezone) { zone = current_tonezone; } else if (!(zone = AST_LIST_FIRST(&tone_zones))) { /* No zone has been found ;( */ AST_RWLIST_UNLOCK(&tone_zones); return NULL; } } /* Look through list of tones in the zone searching for the right one */ for (ts = zone->tones; ts; ts = ts->next) { if (!strcasecmp(ts->name, indication)) break; } AST_RWLIST_UNLOCK(&tone_zones); return ts; }

struct ind_tone_zone* ast_get_indication_zone (  const char *  country  )

locate tone_zone, given the country. if country == NULL, use the default country Definition at line 385 of file indications.c. References ind_tone_zone::alias, AST_LIST_FIRST, ast_log(), AST_RWLIST_RDLOCK, AST_RWLIST_TRAVERSE, AST_RWLIST_UNLOCK, ind_tone_zone::country, current_tonezone, and LOG_NOTICE. Referenced by ast_set_indication_country(), handle_add_indication(), and handle_remove_indication(). { struct ind_tone_zone *tz = NULL; int alias_loop = 0; AST_RWLIST_RDLOCK(&tone_zones); if (!country) { if (current_tonezone) tz = current_tonezone; else tz = AST_LIST_FIRST(&tone_zones); } else { do { AST_RWLIST_TRAVERSE(&tone_zones, tz, list) { if (!strcasecmp(tz->country, country)) break; } if (!tz) break; /* If this is an alias then we have to search yet again otherwise we have found the zonezone */ if (tz->alias && tz->alias[0]) country = tz->alias; else break; } while ((++alias_loop < 20) && tz); } AST_RWLIST_UNLOCK(&tone_zones); /* If we reached the maximum loops to find the proper country via alias, print out a notice */ if (alias_loop == 20) ast_log(LOG_NOTICE, "Alias loop for '%s' is bonkers\n", country); return tz; }

int ast_playtones_start (  struct ast_channel *  chan, int  vol, const char *  playlst, int  interruptible )

Start a tone-list going. Definition at line 220 of file indications.c. References ast_activate_generator(), ast_log(), ast_realloc, ast_strdupa, playtones_item::duration, playtones_item::fac1, playtones_item::fac2, free, playtones_item::init_v2_1, playtones_item::init_v2_2, playtones_item::init_v3_1, playtones_item::init_v3_2, playtones_def::interruptible, playtones_def::items, LOG_WARNING, midi_tohz, playtones_item::modulate, playtones_def::nitems, playtones, playtones_def::reppos, s, strsep(), and playtones_def::vol. Referenced by ast_app_dtget(), ast_indicate_data(), ast_senddigit_begin(), dialtone_indicate(), handle_playtones(), and send_digit_to_chan(). { char *s, *data = ast_strdupa(playlst); /* cute */ struct playtones_def d = { vol, -1, 0, 1, NULL}; char *stringp; char *separator; if (vol < 1) d.vol = 7219; /* Default to -8db */ d.interruptible = interruptible; stringp=data; /* the stringp/data is not null here */ /* check if the data is separated with '|' or with ',' by default */ if (strchr(stringp,'|')) separator = "|"; else separator = ","; s = strsep(&stringp,separator); while (s && *s) { int freq1, freq2, time, modulate=0, midinote=0; if (s[0]=='!') s++; else if (d.reppos == -1) d.reppos = d.nitems; if (sscanf(s, "%d+%d/%d", &freq1, &freq2, &time) == 3) { /* f1+f2/time format */ } else if (sscanf(s, "%d+%d", &freq1, &freq2) == 2) { /* f1+f2 format */ time = 0; } else if (sscanf(s, "%d*%d/%d", &freq1, &freq2, &time) == 3) { /* f1*f2/time format */ modulate = 1; } else if (sscanf(s, "%d*%d", &freq1, &freq2) == 2) { /* f1*f2 format */ time = 0; modulate = 1; } else if (sscanf(s, "%d/%d", &freq1, &time) == 2) { /* f1/time format */ freq2 = 0; } else if (sscanf(s, "%d", &freq1) == 1) { /* f1 format */ freq2 = 0; time = 0; } else if (sscanf(s, "M%d+M%d/%d", &freq1, &freq2, &time) == 3) { /* Mf1+Mf2/time format */ midinote = 1; } else if (sscanf(s, "M%d+M%d", &freq1, &freq2) == 2) { /* Mf1+Mf2 format */ time = 0; midinote = 1; } else if (sscanf(s, "M%d*M%d/%d", &freq1, &freq2, &time) == 3) { /* Mf1*Mf2/time format */ modulate = 1; midinote = 1; } else if (sscanf(s, "M%d*M%d", &freq1, &freq2) == 2) { /* Mf1*Mf2 format */ time = 0; modulate = 1; midinote = 1; } else if (sscanf(s, "M%d/%d", &freq1, &time) == 2) { /* Mf1/time format */ freq2 = -1; midinote = 1; } else if (sscanf(s, "M%d", &freq1) == 1) { /* Mf1 format */ freq2 = -1; time = 0; midinote = 1; } else { ast_log(LOG_WARNING,"%s: tone component '%s' of '%s' is no good\n",chan->name,s,playlst); return -1; } if (midinote) { /* midi notes must be between 0 and 127 */ if ((freq1 >= 0) && (freq1 <= 127)) freq1 = midi_tohz[freq1]; else freq1 = 0; if ((freq2 >= 0) && (freq2 <= 127)) freq2 = midi_tohz[freq2]; else freq2 = 0; } if (!(d.items = ast_realloc(d.items, (d.nitems + 1) * sizeof(*d.items)))) { return -1; } d.items[d.nitems].fac1 = 2.0 * cos(2.0 * M_PI * (freq1 / 8000.0)) * 32768.0; d.items[d.nitems].init_v2_1 = sin(-4.0 * M_PI * (freq1 / 8000.0)) * d.vol; d.items[d.nitems].init_v3_1 = sin(-2.0 * M_PI * (freq1 / 8000.0)) * d.vol; d.items[d.nitems].fac2 = 2.0 * cos(2.0 * M_PI * (freq2 / 8000.0)) * 32768.0; d.items[d.nitems].init_v2_2 = sin(-4.0 * M_PI * (freq2 / 8000.0)) * d.vol; d.items[d.nitems].init_v3_2 = sin(-2.0 * M_PI * (freq2 / 8000.0)) * d.vol; d.items[d.nitems].duration = time; d.items[d.nitems].modulate = modulate; d.nitems++; s = strsep(&stringp,separator); } if (ast_activate_generator(chan, &playtones, &d)) { free(d.items); return -1; } return 0; }

void ast_playtones_stop (  struct ast_channel *  chan  )

Stop the tones from playing. Definition at line 333 of file indications.c. References ast_deactivate_generator(). Referenced by ast_app_dtget(), ast_indicate_data(), ast_senddigit_end(), handle_stopplaytones(), and stop_indicate(). { ast_deactivate_generator(chan); }

int ast_register_indication (  struct ind_tone_zone *  zone, const char *  indication, const char *  tonelist )

add a new indication to a tone_zone. tone_zone must exist. if the indication already exists, it will be replaced. Definition at line 534 of file indications.c. References ind_tone_zone::alias, ast_malloc, AST_RWLIST_UNLOCK, AST_RWLIST_WRLOCK, ast_strdup, ind_tone_zone_sound::data, free, ind_tone_zone_sound::name, ind_tone_zone_sound::next, and ind_tone_zone::tones. Referenced by handle_add_indication(). { struct ind_tone_zone_sound *ts, *ps; /* is it an alias? stop */ if (zone->alias[0]) return -1; AST_RWLIST_WRLOCK(&tone_zones); for (ps=NULL,ts=zone->tones; ts; ps=ts,ts=ts->next) { if (strcasecmp(indication,ts->name)==0) { /* indication already there, replace */ free((void*)ts->name); free((void*)ts->data); break; } } if (!ts) { /* not there, we have to add */ if (!(ts = ast_malloc(sizeof(*ts)))) { AST_RWLIST_UNLOCK(&tone_zones); return -2; } ts->next = NULL; } if (!(ts->name = ast_strdup(indication)) || !(ts->data = ast_strdup(tonelist))) { AST_RWLIST_UNLOCK(&tone_zones); return -2; } if (ps) ps->next = ts; else zone->tones = ts; AST_RWLIST_UNLOCK(&tone_zones); return 0; }

int ast_register_indication_country (  struct ind_tone_zone *  zone  )

add a new country, if country exists, it will be replaced. Definition at line 471 of file indications.c. References AST_RWLIST_INSERT_TAIL, AST_RWLIST_REMOVE_CURRENT, AST_RWLIST_TRAVERSE_SAFE_BEGIN, AST_RWLIST_TRAVERSE_SAFE_END, AST_RWLIST_UNLOCK, AST_RWLIST_WRLOCK, ast_verbose(), ind_tone_zone::country, current_tonezone, free_zone(), option_verbose, and VERBOSE_PREFIX_3. Referenced by handle_add_indication(), and ind_load_module(). { struct ind_tone_zone *tz = NULL; AST_RWLIST_WRLOCK(&tone_zones); AST_RWLIST_TRAVERSE_SAFE_BEGIN(&tone_zones, tz, list) { /* If this is not the same zone, then just continue to the next entry */ if (strcasecmp(zone->country, tz->country)) continue; /* If this zone we are going to remove is the current default then make the new zone the default */ if (tz == current_tonezone) current_tonezone = zone; /* Remove from the linked list */ AST_RWLIST_REMOVE_CURRENT(&tone_zones, list); /* Finally free the zone itself */ free_zone(tz); break; } AST_RWLIST_TRAVERSE_SAFE_END /* Add zone to the list */ AST_RWLIST_INSERT_TAIL(&tone_zones, zone, list); /* It's all over. */ AST_RWLIST_UNLOCK(&tone_zones); if (option_verbose > 2) ast_verbose(VERBOSE_PREFIX_3 "Registered indication country '%s'\n", zone->country); return 0; }

static AST_RWLIST_HEAD_STATIC (  tone_zones  , ind_tone_zone  )  [static]

int ast_set_indication_country (  const char *  country  )

set the default tone country Definition at line 364 of file indications.c. References ast_get_indication_zone(), AST_RWLIST_UNLOCK, AST_RWLIST_WRLOCK, ast_verbose(), current_tonezone, option_verbose, and VERBOSE_PREFIX_3. Referenced by ind_load_module(). { struct ind_tone_zone *zone = NULL; /* If no country is specified or we are unable to find the zone, then return not found */ if (!country || !(zone = ast_get_indication_zone(country))) return 1; if (option_verbose > 2) ast_verbose(VERBOSE_PREFIX_3 "Setting default indication country to '%s'\n", country); /* Protect the current tonezone using the tone_zones lock as well */ AST_RWLIST_WRLOCK(&tone_zones); current_tonezone = zone; AST_RWLIST_UNLOCK(&tone_zones); /* Zone was found */ return 0; }

int ast_unregister_indication (  struct ind_tone_zone *  zone, const char *  indication )

remove an existing tone_zone's indication. tone_zone must exist Definition at line 572 of file indications.c. References ind_tone_zone::alias, AST_RWLIST_UNLOCK, AST_RWLIST_WRLOCK, ind_tone_zone_sound::data, free, ind_tone_zone_sound::name, ind_tone_zone_sound::next, and ind_tone_zone::tones. Referenced by handle_remove_indication(). { struct ind_tone_zone_sound *ts,*ps = NULL, *tmp; int res = -1; /* is it an alias? stop */ if (zone->alias[0]) return -1; AST_RWLIST_WRLOCK(&tone_zones); ts = zone->tones; while (ts) { if (strcasecmp(indication,ts->name)==0) { /* indication found */ tmp = ts->next; if (ps) ps->next = tmp; else zone->tones = tmp; free((void*)ts->name); free((void*)ts->data); free(ts); ts = tmp; res = 0; } else { /* next zone please */ ps = ts; ts = ts->next; } } /* indication not found, goodbye */ AST_RWLIST_UNLOCK(&tone_zones); return res; }

int ast_unregister_indication_country (  const char *  country  )

remove an existing country and all its indications, country must exist Definition at line 505 of file indications.c. References ind_tone_zone::alias, ast_log(), AST_RWLIST_REMOVE_CURRENT, AST_RWLIST_TRAVERSE_SAFE_BEGIN, AST_RWLIST_TRAVERSE_SAFE_END, AST_RWLIST_UNLOCK, AST_RWLIST_WRLOCK, ast_verbose(), ind_tone_zone::country, current_tonezone, free_zone(), LOG_NOTICE, option_verbose, and VERBOSE_PREFIX_3. Referenced by handle_add_indication(), handle_remove_indication(), reload(), and unload_module(). { struct ind_tone_zone *tz = NULL; int res = -1; AST_RWLIST_WRLOCK(&tone_zones); AST_RWLIST_TRAVERSE_SAFE_BEGIN(&tone_zones, tz, list) { if (country && (strcasecmp(country, tz->country) && strcasecmp(country, tz->alias))) continue; /* If this tonezone is the current default then unset it */ if (tz == current_tonezone) { ast_log(LOG_NOTICE,"Removed default indication country '%s'\n", tz->country); current_tonezone = NULL; } /* Remove from the list */ AST_RWLIST_REMOVE_CURRENT(&tone_zones, list); if (option_verbose > 2) ast_verbose(VERBOSE_PREFIX_3 "Unregistered indication country '%s'\n", tz->country); free_zone(tz); res = 0; } AST_RWLIST_TRAVERSE_SAFE_END AST_RWLIST_UNLOCK(&tone_zones); return res; }

struct ind_tone_zone* ast_walk_indications (  const struct ind_tone_zone *  cur  )

support for walking through a list of indications Definition at line 343 of file indications.c. References AST_RWLIST_FIRST, AST_RWLIST_NEXT, AST_RWLIST_RDLOCK, AST_RWLIST_TRAVERSE, and AST_RWLIST_UNLOCK. Referenced by handle_show_indications(). { struct ind_tone_zone *tz = NULL; AST_RWLIST_RDLOCK(&tone_zones); /* If cur is not NULL, then we have to iterate through - otherwise just return the first entry */ if (cur) { AST_RWLIST_TRAVERSE(&tone_zones, tz, list) { if (tz == cur) break; } tz = AST_RWLIST_NEXT(tz, list); } else { tz = AST_RWLIST_FIRST(&tone_zones); } AST_RWLIST_UNLOCK(&tone_zones); return tz; }

static void free_zone (  struct ind_tone_zone *  zone  )  [inline, static]

Definition at line 452 of file indications.c. References ind_tone_zone_sound::data, free, ind_tone_zone_sound::name, ind_tone_zone_sound::next, ind_tone_zone::ringcadence, and ind_tone_zone::tones. Referenced by ast_register_indication_country(), and ast_unregister_indication_country(). { while (zone->tones) { struct ind_tone_zone_sound *tmp = zone->tones->next; free((void*)zone->tones->name); free((void*)zone->tones->data); free(zone->tones); zone->tones = tmp; } if (zone->ringcadence) free(zone->ringcadence); free(zone); }

static void* playtones_alloc (  struct ast_channel *  chan, void *  params )  [static]

Definition at line 116 of file indications.c. References ast_calloc, ast_clear_flag, AST_FLAG_WRITE_INT, AST_FORMAT_SLINEAR, ast_log(), ast_set_flag, ast_set_write_format(), playtones_def::interruptible, playtones_def::items, LOG_WARNING, playtones_def::nitems, playtones_release(), playtones_def::reppos, playtones_def::vol, and ast_channel::writeformat. { struct playtones_def *pd = params; struct playtones_state *ps = NULL; if (!(ps = ast_calloc(1, sizeof(*ps)))) return NULL; ps->origwfmt = chan->writeformat; if (ast_set_write_format(chan, AST_FORMAT_SLINEAR)) { ast_log(LOG_WARNING, "Unable to set '%s' to signed linear format (write)\n", chan->name); playtones_release(NULL, ps); ps = NULL; } else { ps->vol = pd->vol; ps->reppos = pd->reppos; ps->nitems = pd->nitems; ps->items = pd->items; ps->oldnpos = -1; } /* Let interrupts interrupt :) */ if (pd->interruptible) ast_set_flag(chan, AST_FLAG_WRITE_INT); else ast_clear_flag(chan, AST_FLAG_WRITE_INT); return ps; }

static int playtones_generator (  struct ast_channel *  chan, void *  data, int  len, int  samples )  [static]

Definition at line 147 of file indications.c. References ast_log(), playtones_state::data, playtones_state::f, playtones_item::fac1, playtones_item::fac2, playtones_item::init_v2_1, playtones_item::init_v2_2, playtones_item::init_v3_1, playtones_item::init_v3_2, playtones_state::items, LOG_WARNING, playtones_item::modulate, playtones_state::npos, playtones_state::oldnpos, playtones_state::v1_1, playtones_state::v1_2, playtones_state::v2_1, playtones_state::v2_2, playtones_state::v3_1, and playtones_state::v3_2. { struct playtones_state *ps = data; struct playtones_item *pi; int x; /* we need to prepare a frame with 16 * timelen samples as we're * generating SLIN audio */ len = samples * 2; if (len > sizeof(ps->data) / 2 - 1) { ast_log(LOG_WARNING, "Can't generate that much data!\n"); return -1; } memset(&ps->f, 0, sizeof(ps->f)); pi = &ps->items[ps->npos]; if (ps->oldnpos != ps->npos) { /* Load new parameters */ ps->v1_1 = 0; ps->v2_1 = pi->init_v2_1; ps->v3_1 = pi->init_v3_1; ps->v1_2 = 0; ps->v2_2 = pi->init_v2_2; ps->v3_2 = pi->init_v3_2; ps->oldnpos = ps->npos; } for (x=0;x<len/2;x++) { ps->v1_1 = ps->v2_1; ps->v2_1 = ps->v3_1; ps->v3_1 = (pi->fac1 * ps->v2_1 >> 15) - ps->v1_1; ps->v1_2 = ps->v2_2; ps->v2_2 = ps->v3_2; ps->v3_2 = (pi->fac2 * ps->v2_2 >> 15) - ps->v1_2; if (pi->modulate) { int p; p = ps->v3_2 - 32768; if (p < 0) p = -p; p = ((p * 9) / 10) + 1; ps->data[x] = (ps->v3_1 * p) >> 15; } else ps->data[x] = ps->v3_1 + ps->v3_2; } ps->f.frametype = AST_FRAME_VOICE; ps->f.subclass = AST_FORMAT_SLINEAR; ps->f.datalen = len; ps->f.samples = samples; ps->f.offset = AST_FRIENDLY_OFFSET; ps->f.data = ps->data; ps->f.delivery.tv_sec = 0; ps->f.delivery.tv_usec = 0; ast_write(chan, &ps->f); ps->pos += x; if (pi->duration && ps->pos >= pi->duration * 8) { /* item finished? */ ps->pos = 0; /* start new item */ ps->npos++; if (ps->npos >= ps->nitems) { /* last item? */ if (ps->reppos == -1) /* repeat set? */ return -1; ps->npos = ps->reppos; /* redo from top */ } } return 0; }

static void playtones_release (  struct ast_channel *  chan, void *  params )  [static]

Definition at line 104 of file indications.c. References ast_set_write_format(), free, playtones_state::items, and playtones_state::origwfmt. Referenced by playtones_alloc(). { struct playtones_state *ps = params; if (chan) ast_set_write_format(chan, ps->origwfmt); if (ps->items) free(ps->items); free(ps); }

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Variable Documentation

struct ind_tone_zone* current_tonezone [static]

Definition at line 341 of file indications.c. Referenced by ast_get_indication_tone(), ast_get_indication_zone(), ast_register_indication_country(), ast_set_indication_country(), and ast_unregister_indication_country().

int midi_tohz[128] [static]

Definition at line 49 of file indications.c. Referenced by ast_playtones_start().

struct ast_generator playtones [static]

Initial value: { alloc: playtones_alloc, release: playtones_release, generate: playtones_generator, } Definition at line 214 of file indications.c. Referenced by ast_playtones_start().

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