297 lines
6.8 KiB
C
Executable File
297 lines
6.8 KiB
C
Executable File
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* Generic Linux Telephony Interface driver
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*
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* Copyright (C) 1999, Mark Spencer
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*
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* Mark Spencer <markster@linux-support.net>
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License
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*/
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#include <stdio.h>
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#include <pthread.h>
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#include <string.h>
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#include <asterisk/lock.h>
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#include <asterisk/channel.h>
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#include <asterisk/channel_pvt.h>
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#include <asterisk/config.h>
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#include <asterisk/logger.h>
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#include <asterisk/module.h>
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#include <asterisk/pbx.h>
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#include <asterisk/options.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <arpa/inet.h>
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#include <fcntl.h>
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#include <sys/ioctl.h>
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#include <nbs.h>
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static char *desc = "Network Broadcast Sound Support";
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static char *type = "NBS";
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static char *tdesc = "Network Broadcast Sound Driver";
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static int usecnt =0;
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/* Only linear is allowed */
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static int prefformat = AST_FORMAT_SLINEAR;
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static ast_mutex_t usecnt_lock = AST_MUTEX_INITIALIZER;
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static char context[AST_MAX_EXTENSION] = "default";
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/* NBS creates private structures on demand */
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struct nbs_pvt {
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NBS *nbs;
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struct ast_channel *owner; /* Channel we belong to, possibly NULL */
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char app[16]; /* Our app */
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char stream[80]; /* Our stream */
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struct ast_frame fr; /* "null" frame */
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};
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static int nbs_call(struct ast_channel *ast, char *dest, int timeout)
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{
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struct nbs_pvt *p;
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p = ast->pvt->pvt;
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if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
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ast_log(LOG_WARNING, "nbs_call called on %s, neither down nor reserved\n", ast->name);
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return -1;
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}
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/* When we call, it just works, really, there's no destination... Just
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ring the phone and wait for someone to answer */
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if (option_debug)
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ast_log(LOG_DEBUG, "Calling %s on %s\n", dest, ast->name);
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/* If we can't connect, return congestion */
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if (nbs_connect(p->nbs)) {
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ast_log(LOG_WARNING, "NBS Connection failed on %s\n", ast->name);
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ast_queue_control(ast, AST_CONTROL_CONGESTION);
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} else {
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ast_setstate(ast, AST_STATE_RINGING);
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ast_queue_control(ast, AST_CONTROL_ANSWER);
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}
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return 0;
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}
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static void nbs_destroy(struct nbs_pvt *p)
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{
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if (p->nbs)
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nbs_delstream(p->nbs);
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free(p);
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}
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static struct nbs_pvt *nbs_alloc(void *data)
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{
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struct nbs_pvt *p;
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int flags = 0;
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char stream[256] = "";
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char *opts;
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strncpy(stream, data, sizeof(stream) - 1);
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if ((opts = strchr(stream, ':'))) {
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*opts = '\0';
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opts++;
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} else
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opts = "";
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p = malloc(sizeof(struct nbs_pvt));
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if (p) {
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memset(p, 0, sizeof(struct nbs_pvt));
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if (strlen(opts)) {
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if (strchr(opts, 'm'))
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flags |= NBS_FLAG_MUTE;
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if (strchr(opts, 'o'))
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flags |= NBS_FLAG_OVERSPEAK;
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if (strchr(opts, 'e'))
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flags |= NBS_FLAG_EMERGENCY;
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if (strchr(opts, 'O'))
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flags |= NBS_FLAG_OVERRIDE;
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} else
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flags = NBS_FLAG_OVERSPEAK;
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strncpy(p->stream, stream, sizeof(p->stream) - 1);
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p->nbs = nbs_newstream("asterisk", stream, flags);
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if (!p->nbs) {
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ast_log(LOG_WARNING, "Unable to allocate new NBS stream '%s' with flags %d\n", stream, flags);
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free(p);
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p = NULL;
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} else {
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/* Set for 8000 hz mono, 640 samples */
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nbs_setbitrate(p->nbs, 8000);
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nbs_setchannels(p->nbs, 1);
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nbs_setblocksize(p->nbs, 640);
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nbs_setblocking(p->nbs, 0);
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}
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}
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return p;
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}
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static int nbs_hangup(struct ast_channel *ast)
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{
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struct nbs_pvt *p;
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p = ast->pvt->pvt;
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if (option_debug)
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ast_log(LOG_DEBUG, "nbs_hangup(%s)\n", ast->name);
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if (!ast->pvt->pvt) {
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ast_log(LOG_WARNING, "Asked to hangup channel not connected\n");
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return 0;
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}
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nbs_destroy(p);
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ast->pvt->pvt = NULL;
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ast_setstate(ast, AST_STATE_DOWN);
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return 0;
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}
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static struct ast_frame *nbs_xread(struct ast_channel *ast)
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{
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struct nbs_pvt *p = ast->pvt->pvt;
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/* Some nice norms */
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p->fr.datalen = 0;
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p->fr.samples = 0;
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p->fr.data = NULL;
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p->fr.src = type;
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p->fr.offset = 0;
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p->fr.mallocd=0;
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ast_log(LOG_DEBUG, "Returning null frame on %s\n", ast->name);
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return &p->fr;
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}
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static int nbs_xwrite(struct ast_channel *ast, struct ast_frame *frame)
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{
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struct nbs_pvt *p = ast->pvt->pvt;
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/* Write a frame of (presumably voice) data */
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if (frame->frametype != AST_FRAME_VOICE) {
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if (frame->frametype != AST_FRAME_IMAGE)
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ast_log(LOG_WARNING, "Don't know what to do with frame type '%d'\n", frame->frametype);
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return 0;
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}
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if (!(frame->subclass &
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(AST_FORMAT_SLINEAR))) {
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ast_log(LOG_WARNING, "Cannot handle frames in %d format\n", frame->subclass);
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return 0;
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}
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if (ast->_state != AST_STATE_UP) {
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/* Don't try tos end audio on-hook */
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return 0;
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}
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if (nbs_write(p->nbs, frame->data, frame->datalen / 2) < 0)
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return -1;
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return 0;
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}
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static struct ast_channel *nbs_new(struct nbs_pvt *i, int state)
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{
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struct ast_channel *tmp;
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tmp = ast_channel_alloc(1);
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if (tmp) {
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snprintf(tmp->name, sizeof(tmp->name), "NBS/%s", i->stream);
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tmp->type = type;
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tmp->fds[0] = nbs_fd(i->nbs);
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tmp->nativeformats = prefformat;
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tmp->pvt->rawreadformat = prefformat;
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tmp->pvt->rawwriteformat = prefformat;
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tmp->writeformat = prefformat;
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tmp->readformat = prefformat;
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ast_setstate(tmp, state);
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if (state == AST_STATE_RING)
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tmp->rings = 1;
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tmp->pvt->pvt = i;
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tmp->pvt->call = nbs_call;
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tmp->pvt->hangup = nbs_hangup;
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tmp->pvt->read = nbs_xread;
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tmp->pvt->write = nbs_xwrite;
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strncpy(tmp->context, context, sizeof(tmp->context)-1);
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strncpy(tmp->exten, "s", sizeof(tmp->exten) - 1);
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strcpy(tmp->language, "");
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i->owner = tmp;
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ast_mutex_lock(&usecnt_lock);
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usecnt++;
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ast_mutex_unlock(&usecnt_lock);
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ast_update_use_count();
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if (state != AST_STATE_DOWN) {
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if (ast_pbx_start(tmp)) {
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ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
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ast_hangup(tmp);
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}
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}
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} else
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ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
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return tmp;
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}
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static struct ast_channel *nbs_request(char *type, int format, void *data)
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{
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int oldformat;
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struct nbs_pvt *p;
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struct ast_channel *tmp = NULL;
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oldformat = format;
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format &= (AST_FORMAT_SLINEAR);
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if (!format) {
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ast_log(LOG_NOTICE, "Asked to get a channel of unsupported format '%d'\n", oldformat);
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return NULL;
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}
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p = nbs_alloc(data);
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if (p) {
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tmp = nbs_new(p, AST_STATE_DOWN);
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if (!tmp)
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nbs_destroy(p);
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}
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return tmp;
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}
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static int __unload_module(void)
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{
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/* First, take us out of the channel loop */
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ast_channel_unregister(type);
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return 0;
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}
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int unload_module(void)
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{
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return __unload_module();
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}
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int load_module()
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{
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/* Make sure we can register our Adtranphone channel type */
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if (ast_channel_register(type, tdesc,
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AST_FORMAT_SLINEAR, nbs_request)) {
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ast_log(LOG_ERROR, "Unable to register channel class %s\n", type);
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__unload_module();
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return -1;
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}
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return 0;
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}
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int usecount()
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{
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int res;
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ast_mutex_lock(&usecnt_lock);
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res = usecnt;
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ast_mutex_unlock(&usecnt_lock);
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return res;
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}
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char *description()
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{
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return desc;
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}
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char *key()
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{
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return ASTERISK_GPL_KEY;
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}
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