1 files changed, 292 insertions, 0 deletions
diff --git a/trunk/channels/chan_nbs.c b/trunk/channels/chan_nbs.c
new file mode 100644
index 000000000..e190a436c
--- /dev/null
+++ b/trunk/channels/chan_nbs.c
@@ -0,0 +1,292 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 1999 - 2006, Digium, Inc.
+ *
+ * Mark Spencer <markster@digium.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ *
+ * \brief Network broadcast sound support channel driver
+ * 
+ * \author Mark Spencer <markster@digium.com>
+ *
+ * \ingroup channel_drivers
+ */
+
+/*** MODULEINFO
+	<depend>nbs</depend>
+ ***/
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <arpa/inet.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <nbs.h>
+
+#include "asterisk/lock.h"
+#include "asterisk/channel.h"
+#include "asterisk/config.h"
+#include "asterisk/module.h"
+#include "asterisk/pbx.h"
+#include "asterisk/utils.h"
+
+static const char tdesc[] = "Network Broadcast Sound Driver";
+
+/* Only linear is allowed */
+static int prefformat = AST_FORMAT_SLINEAR;
+
+static char context[AST_MAX_EXTENSION] = "default";
+static char type[] = "NBS";
+
+/* NBS creates private structures on demand */
+   
+struct nbs_pvt {
+	NBS *nbs;
+	struct ast_channel *owner;		/* Channel we belong to, possibly NULL */
+	char app[16];					/* Our app */
+	char stream[80];				/* Our stream */
+	struct ast_frame fr;			/* "null" frame */
+	struct ast_module_user *u;		/*! for holding a reference to this module */
+};
+
+static struct ast_channel *nbs_request(const char *type, int format, void *data, int *cause);
+static int nbs_call(struct ast_channel *ast, char *dest, int timeout);
+static int nbs_hangup(struct ast_channel *ast);
+static struct ast_frame *nbs_xread(struct ast_channel *ast);
+static int nbs_xwrite(struct ast_channel *ast, struct ast_frame *frame);
+
+static const struct ast_channel_tech nbs_tech = {
+	.type = type,
+	.description = tdesc,
+	.capabilities = AST_FORMAT_SLINEAR,
+	.requester = nbs_request,
+	.call = nbs_call,
+	.hangup = nbs_hangup,
+	.read = nbs_xread,
+	.write = nbs_xwrite,
+};
+
+static int nbs_call(struct ast_channel *ast, char *dest, int timeout)
+{
+	struct nbs_pvt *p;
+
+	p = ast->tech_pvt;
+
+	if ((ast->_state != AST_STATE_DOWN) && (ast->_state != AST_STATE_RESERVED)) {
+		ast_log(LOG_WARNING, "nbs_call called on %s, neither down nor reserved\n", ast->name);
+		return -1;
+	}
+	/* When we call, it just works, really, there's no destination...  Just
+	   ring the phone and wait for someone to answer */
+	ast_debug(1, "Calling %s on %s\n", dest, ast->name);
+
+	/* If we can't connect, return congestion */
+	if (nbs_connect(p->nbs)) {
+		ast_log(LOG_WARNING, "NBS Connection failed on %s\n", ast->name);
+		ast_queue_control(ast, AST_CONTROL_CONGESTION);
+	} else {
+		ast_setstate(ast, AST_STATE_RINGING);
+		ast_queue_control(ast, AST_CONTROL_ANSWER);
+	}
+
+	return 0;
+}
+
+static void nbs_destroy(struct nbs_pvt *p)
+{
+	if (p->nbs)
+		nbs_delstream(p->nbs);
+	ast_module_user_remove(p->u);
+	ast_free(p);
+}
+
+static struct nbs_pvt *nbs_alloc(void *data)
+{
+	struct nbs_pvt *p;
+	int flags = 0;
+	char stream[256];
+	char *opts;
+
+	ast_copy_string(stream, data, sizeof(stream));
+	if ((opts = strchr(stream, ':'))) {
+		*opts = '\0';
+		opts++;
+	} else
+		opts = "";
+	p = ast_calloc(1, sizeof(*p));
+	if (p) {
+		if (!ast_strlen_zero(opts)) {
+			if (strchr(opts, 'm'))
+				flags |= NBS_FLAG_MUTE;
+			if (strchr(opts, 'o'))
+				flags |= NBS_FLAG_OVERSPEAK;
+			if (strchr(opts, 'e'))
+				flags |= NBS_FLAG_EMERGENCY;
+			if (strchr(opts, 'O'))
+				flags |= NBS_FLAG_OVERRIDE;
+		} else
+			flags = NBS_FLAG_OVERSPEAK;
+		
+		ast_copy_string(p->stream, stream, sizeof(p->stream));
+		p->nbs = nbs_newstream("asterisk", stream, flags);
+		if (!p->nbs) {
+			ast_log(LOG_WARNING, "Unable to allocate new NBS stream '%s' with flags %d\n", stream, flags);
+			ast_free(p);
+			p = NULL;
+		} else {
+			/* Set for 8000 hz mono, 640 samples */
+			nbs_setbitrate(p->nbs, 8000);
+			nbs_setchannels(p->nbs, 1);
+			nbs_setblocksize(p->nbs, 640);
+			nbs_setblocking(p->nbs, 0);
+		}
+	}
+	return p;
+}
+
+static int nbs_hangup(struct ast_channel *ast)
+{
+	struct nbs_pvt *p;
+	p = ast->tech_pvt;
+	ast_debug(1, "nbs_hangup(%s)\n", ast->name);
+	if (!ast->tech_pvt) {
+		ast_log(LOG_WARNING, "Asked to hangup channel not connected\n");
+		return 0;
+	}
+	nbs_destroy(p);
+	ast->tech_pvt = NULL;
+	ast_setstate(ast, AST_STATE_DOWN);
+	return 0;
+}
+
+static struct ast_frame  *nbs_xread(struct ast_channel *ast)
+{
+	struct nbs_pvt *p = ast->tech_pvt;
+	
+
+	/* Some nice norms */
+	p->fr.datalen = 0;
+	p->fr.samples = 0;
+	p->fr.data =  NULL;
+	p->fr.src = type;
+	p->fr.offset = 0;
+	p->fr.mallocd=0;
+	p->fr.delivery.tv_sec = 0;
+	p->fr.delivery.tv_usec = 0;
+
+	ast_debug(1, "Returning null frame on %s\n", ast->name);
+
+	return &p->fr;
+}
+
+static int nbs_xwrite(struct ast_channel *ast, struct ast_frame *frame)
+{
+	struct nbs_pvt *p = ast->tech_pvt;
+	/* Write a frame of (presumably voice) data */
+	if (frame->frametype != AST_FRAME_VOICE) {
+		if (frame->frametype != AST_FRAME_IMAGE)
+			ast_log(LOG_WARNING, "Don't know what to do with  frame type '%d'\n", frame->frametype);
+		return 0;
+	}
+	if (!(frame->subclass &
+		(AST_FORMAT_SLINEAR))) {
+		ast_log(LOG_WARNING, "Cannot handle frames in %d format\n", frame->subclass);
+		return 0;
+	}
+	if (ast->_state != AST_STATE_UP) {
+		/* Don't try tos end audio on-hook */
+		return 0;
+	}
+	if (nbs_write(p->nbs, frame->data, frame->datalen / 2) < 0) 
+		return -1;
+	return 0;
+}
+
+static struct ast_channel *nbs_new(struct nbs_pvt *i, int state)
+{
+	struct ast_channel *tmp;
+	tmp = ast_channel_alloc(1, state, 0, 0, "", "s", context, 0, "NBS/%s", i->stream);
+	if (tmp) {
+		tmp->tech = &nbs_tech;
+		ast_channel_set_fd(tmp, 0, nbs_fd(i->nbs));
+		tmp->nativeformats = prefformat;
+		tmp->rawreadformat = prefformat;
+		tmp->rawwriteformat = prefformat;
+		tmp->writeformat = prefformat;
+		tmp->readformat = prefformat;
+		if (state == AST_STATE_RING)
+			tmp->rings = 1;
+		tmp->tech_pvt = i;
+		ast_copy_string(tmp->context, context, sizeof(tmp->context));
+		ast_copy_string(tmp->exten, "s",  sizeof(tmp->exten));
+		ast_string_field_set(tmp, language, "");
+		i->owner = tmp;
+		i->u = ast_module_user_add(tmp);
+		if (state != AST_STATE_DOWN) {
+			if (ast_pbx_start(tmp)) {
+				ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
+				ast_hangup(tmp);
+			}
+		}
+	} else
+		ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
+	return tmp;
+}
+
+
+static struct ast_channel *nbs_request(const char *type, int format, void *data, int *cause)
+{
+	int oldformat;
+	struct nbs_pvt *p;
+	struct ast_channel *tmp = NULL;
+	
+	oldformat = format;
+	format &= (AST_FORMAT_SLINEAR);
+	if (!format) {
+		ast_log(LOG_NOTICE, "Asked to get a channel of unsupported format '%d'\n", oldformat);
+		return NULL;
+	}
+	p = nbs_alloc(data);
+	if (p) {
+		tmp = nbs_new(p, AST_STATE_DOWN);
+		if (!tmp)
+			nbs_destroy(p);
+	}
+	return tmp;
+}
+
+static int unload_module(void)
+{
+	/* First, take us out of the channel loop */
+	ast_channel_unregister(&nbs_tech);
+	return 0;
+}
+
+static int load_module(void)
+{
+	/* Make sure we can register our channel type */
+	if (ast_channel_register(&nbs_tech)) {
+		ast_log(LOG_ERROR, "Unable to register channel class %s\n", type);
+		return -1;
+	}
+	return 0;
+}
+
+AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Network Broadcast Sound Support");