Merge in the bridge_construction branch to make the system use the Bridging API.

Breaks many things until they can be reworked.  A partial list:
chan_agent
chan_dahdi, chan_misdn, chan_iax2 native bridging
app_queue
COLP updates
DTMF attended transfers
Protocol attended transfers


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@389378 65c4cc65-6c06-0410-ace0-fbb531ad65f3

apps/confbridge/conf_chan_record.c

@@ -0,0 +1,94 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2013 Digium, Inc.
+ *
+ * Richard Mudgett <rmudgett@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 ConfBridge recorder channel driver
+ *
+ * \author Richard Mudgett <rmudgett@digium.com>
+ *
+ * See Also:
+ * \arg \ref AstCREDITS
+ */
+
+
+#include "asterisk.h"
+
+ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
+
+#include "asterisk/channel.h"
+#include "asterisk/bridging.h"
+#include "include/confbridge.h"
+
+/* ------------------------------------------------------------------- */
+
+static int rec_call(struct ast_channel *chan, const char *addr, int timeout)
+{
+	/* Make sure anyone calling ast_call() for this channel driver is going to fail. */
+	return -1;
+}
+
+static struct ast_frame *rec_read(struct ast_channel *ast)
+{
+	return &ast_null_frame;
+}
+
+static int rec_write(struct ast_channel *ast, struct ast_frame *f)
+{
+	return 0;
+}
+
+static struct ast_channel *rec_request(const char *type, struct ast_format_cap *cap, const struct ast_channel *requestor, const char *data, int *cause)
+{
+	struct ast_channel *chan;
+	struct ast_format format;
+	const char *conf_name = data;
+
+	chan = ast_channel_alloc(1, AST_STATE_UP, NULL, NULL, NULL, NULL, NULL, NULL, 0,
+		"CBRec/conf-%s-uid-%d",
+		conf_name, (int) ast_random());
+	if (!chan) {
+		return NULL;
+	}
+	if (ast_channel_add_bridge_role(chan, "recorder")) {
+		ast_channel_release(chan);
+		return NULL;
+	}
+	ast_format_set(&format, AST_FORMAT_SLINEAR, 0);
+	ast_channel_tech_set(chan, conf_record_get_tech());
+	ast_format_cap_add_all(ast_channel_nativeformats(chan));
+	ast_format_copy(ast_channel_writeformat(chan), &format);
+	ast_format_copy(ast_channel_rawwriteformat(chan), &format);
+	ast_format_copy(ast_channel_readformat(chan), &format);
+	ast_format_copy(ast_channel_rawreadformat(chan), &format);
+	return chan;
+}
+
+static struct ast_channel_tech record_tech = {
+	.type = "CBRec",
+	.description = "Conference Bridge Recording Channel",
+	.requester = rec_request,
+	.call = rec_call,
+	.read = rec_read,
+	.write = rec_write,
+};
+
+struct ast_channel_tech *conf_record_get_tech(void)
+{
+	return &record_tech;
+}