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00028 #include <stdio.h>
00029 #include <string.h>
00030 #include <sys/socket.h>
00031 #include <sys/time.h>
00032 #include <errno.h>
00033 #include <unistd.h>
00034 #include <stdlib.h>
00035 #include <arpa/inet.h>
00036 #include <fcntl.h>
00037 #include <sys/ioctl.h>
00038 #include <nbs.h>
00039
00040 #include "asterisk.h"
00041
00042 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 7221 $")
00043
00044 #include "asterisk/lock.h"
00045 #include "asterisk/channel.h"
00046 #include "asterisk/config.h"
00047 #include "asterisk/logger.h"
00048 #include "asterisk/module.h"
00049 #include "asterisk/pbx.h"
00050 #include "asterisk/options.h"
00051 #include "asterisk/utils.h"
00052
00053 static const char desc[] = "Network Broadcast Sound Support";
00054 static const char type[] = "NBS";
00055 static const char tdesc[] = "Network Broadcast Sound Driver";
00056
00057 static int usecnt =0;
00058
00059
00060 static int prefformat = AST_FORMAT_SLINEAR;
00061
00062 AST_MUTEX_DEFINE_STATIC(usecnt_lock);
00063
00064 static char context[AST_MAX_EXTENSION] = "default";
00065
00066
00067
00068 struct nbs_pvt {
00069 NBS *nbs;
00070 struct ast_channel *owner;
00071 char app[16];
00072 char stream[80];
00073 struct ast_frame fr;
00074 };
00075
00076 static struct ast_channel *nbs_request(const char *type, int format, void *data, int *cause);
00077 static int nbs_call(struct ast_channel *ast, char *dest, int timeout);
00078 static int nbs_hangup(struct ast_channel *ast);
00079 static struct ast_frame *nbs_xread(struct ast_channel *ast);
00080 static int nbs_xwrite(struct ast_channel *ast, struct ast_frame *frame);
00081
00082 static const struct ast_channel_tech nbs_tech = {
00083 .type = type,
00084 .description = tdesc,
00085 .capabilities = AST_FORMAT_SLINEAR,
00086 .requester = nbs_request,
00087 .call = nbs_call,
00088 .hangup = nbs_hangup,
00089 .read = nbs_xread,
00090 .write = nbs_xwrite,
00091 };
00092
00093 static int nbs_call(struct ast_channel *ast, char *dest, int timeout)
00094 {
00095 struct nbs_pvt *p;
00096
00097 p = ast->tech_pvt;
00098
00099 if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
00100 ast_log(LOG_WARNING, "nbs_call called on %s, neither down nor reserved\n", ast->name);
00101 return -1;
00102 }
00103
00104
00105 if (option_debug)
00106 ast_log(LOG_DEBUG, "Calling %s on %s\n", dest, ast->name);
00107
00108
00109 if (nbs_connect(p->nbs)) {
00110 ast_log(LOG_WARNING, "NBS Connection failed on %s\n", ast->name);
00111 ast_queue_control(ast, AST_CONTROL_CONGESTION);
00112 } else {
00113 ast_setstate(ast, AST_STATE_RINGING);
00114 ast_queue_control(ast, AST_CONTROL_ANSWER);
00115 }
00116
00117 return 0;
00118 }
00119
00120 static void nbs_destroy(struct nbs_pvt *p)
00121 {
00122 if (p->nbs)
00123 nbs_delstream(p->nbs);
00124 free(p);
00125 }
00126
00127 static struct nbs_pvt *nbs_alloc(void *data)
00128 {
00129 struct nbs_pvt *p;
00130 int flags = 0;
00131 char stream[256] = "";
00132 char *opts;
00133 strncpy(stream, data, sizeof(stream) - 1);
00134 if ((opts = strchr(stream, ':'))) {
00135 *opts = '\0';
00136 opts++;
00137 } else
00138 opts = "";
00139 p = malloc(sizeof(struct nbs_pvt));
00140 if (p) {
00141 memset(p, 0, sizeof(struct nbs_pvt));
00142 if (!ast_strlen_zero(opts)) {
00143 if (strchr(opts, 'm'))
00144 flags |= NBS_FLAG_MUTE;
00145 if (strchr(opts, 'o'))
00146 flags |= NBS_FLAG_OVERSPEAK;
00147 if (strchr(opts, 'e'))
00148 flags |= NBS_FLAG_EMERGENCY;
00149 if (strchr(opts, 'O'))
00150 flags |= NBS_FLAG_OVERRIDE;
00151 } else
00152 flags = NBS_FLAG_OVERSPEAK;
00153
00154 strncpy(p->stream, stream, sizeof(p->stream) - 1);
00155 p->nbs = nbs_newstream("asterisk", stream, flags);
00156 if (!p->nbs) {
00157 ast_log(LOG_WARNING, "Unable to allocate new NBS stream '%s' with flags %d\n", stream, flags);
00158 free(p);
00159 p = NULL;
00160 } else {
00161
00162 nbs_setbitrate(p->nbs, 8000);
00163 nbs_setchannels(p->nbs, 1);
00164 nbs_setblocksize(p->nbs, 640);
00165 nbs_setblocking(p->nbs, 0);
00166 }
00167 }
00168 return p;
00169 }
00170
00171 static int nbs_hangup(struct ast_channel *ast)
00172 {
00173 struct nbs_pvt *p;
00174 p = ast->tech_pvt;
00175 if (option_debug)
00176 ast_log(LOG_DEBUG, "nbs_hangup(%s)\n", ast->name);
00177 if (!ast->tech_pvt) {
00178 ast_log(LOG_WARNING, "Asked to hangup channel not connected\n");
00179 return 0;
00180 }
00181 nbs_destroy(p);
00182 ast->tech_pvt = NULL;
00183 ast_setstate(ast, AST_STATE_DOWN);
00184 return 0;
00185 }
00186
00187 static struct ast_frame *nbs_xread(struct ast_channel *ast)
00188 {
00189 struct nbs_pvt *p = ast->tech_pvt;
00190
00191
00192
00193 p->fr.datalen = 0;
00194 p->fr.samples = 0;
00195 p->fr.data = NULL;
00196 p->fr.src = type;
00197 p->fr.offset = 0;
00198 p->fr.mallocd=0;
00199 p->fr.delivery.tv_sec = 0;
00200 p->fr.delivery.tv_usec = 0;
00201
00202 ast_log(LOG_DEBUG, "Returning null frame on %s\n", ast->name);
00203
00204 return &p->fr;
00205 }
00206
00207 static int nbs_xwrite(struct ast_channel *ast, struct ast_frame *frame)
00208 {
00209 struct nbs_pvt *p = ast->tech_pvt;
00210
00211 if (frame->frametype != AST_FRAME_VOICE) {
00212 if (frame->frametype != AST_FRAME_IMAGE)
00213 ast_log(LOG_WARNING, "Don't know what to do with frame type '%d'\n", frame->frametype);
00214 return 0;
00215 }
00216 if (!(frame->subclass &
00217 (AST_FORMAT_SLINEAR))) {
00218 ast_log(LOG_WARNING, "Cannot handle frames in %d format\n", frame->subclass);
00219 return 0;
00220 }
00221 if (ast->_state != AST_STATE_UP) {
00222
00223 return 0;
00224 }
00225 if (nbs_write(p->nbs, frame->data, frame->datalen / 2) < 0)
00226 return -1;
00227 return 0;
00228 }
00229
00230 static struct ast_channel *nbs_new(struct nbs_pvt *i, int state)
00231 {
00232 struct ast_channel *tmp;
00233 tmp = ast_channel_alloc(1);
00234 if (tmp) {
00235 tmp->tech = &nbs_tech;
00236 snprintf(tmp->name, sizeof(tmp->name), "NBS/%s", i->stream);
00237 tmp->type = type;
00238 tmp->fds[0] = nbs_fd(i->nbs);
00239 tmp->nativeformats = prefformat;
00240 tmp->rawreadformat = prefformat;
00241 tmp->rawwriteformat = prefformat;
00242 tmp->writeformat = prefformat;
00243 tmp->readformat = prefformat;
00244 ast_setstate(tmp, state);
00245 if (state == AST_STATE_RING)
00246 tmp->rings = 1;
00247 tmp->tech_pvt = i;
00248 strncpy(tmp->context, context, sizeof(tmp->context)-1);
00249 strncpy(tmp->exten, "s", sizeof(tmp->exten) - 1);
00250 tmp->language[0] = '\0';
00251 i->owner = tmp;
00252 ast_mutex_lock(&usecnt_lock);
00253 usecnt++;
00254 ast_mutex_unlock(&usecnt_lock);
00255 ast_update_use_count();
00256 if (state != AST_STATE_DOWN) {
00257 if (ast_pbx_start(tmp)) {
00258 ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
00259 ast_hangup(tmp);
00260 }
00261 }
00262 } else
00263 ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
00264 return tmp;
00265 }
00266
00267
00268 static struct ast_channel *nbs_request(const char *type, int format, void *data, int *cause)
00269 {
00270 int oldformat;
00271 struct nbs_pvt *p;
00272 struct ast_channel *tmp = NULL;
00273
00274 oldformat = format;
00275 format &= (AST_FORMAT_SLINEAR);
00276 if (!format) {
00277 ast_log(LOG_NOTICE, "Asked to get a channel of unsupported format '%d'\n", oldformat);
00278 return NULL;
00279 }
00280 p = nbs_alloc(data);
00281 if (p) {
00282 tmp = nbs_new(p, AST_STATE_DOWN);
00283 if (!tmp)
00284 nbs_destroy(p);
00285 }
00286 return tmp;
00287 }
00288
00289 static int __unload_module(void)
00290 {
00291
00292 ast_channel_unregister(&nbs_tech);
00293 return 0;
00294 }
00295
00296 int unload_module(void)
00297 {
00298 return __unload_module();
00299 }
00300
00301 int load_module()
00302 {
00303
00304 if (ast_channel_register(&nbs_tech)) {
00305 ast_log(LOG_ERROR, "Unable to register channel class %s\n", type);
00306 __unload_module();
00307 return -1;
00308 }
00309 return 0;
00310 }
00311
00312 int usecount()
00313 {
00314 return usecnt;
00315 }
00316
00317 char *description()
00318 {
00319 return (char *) desc;
00320 }
00321
00322 char *key()
00323 {
00324 return ASTERISK_GPL_KEY;
00325 }