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Commit 02295456 authored by Joshua Colp's avatar Joshua Colp
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chan_rtp: Add unicast RTP support. 

This module supports sending both unicast and multicast RTP
to a specified target. Multicast functionality is the same as
chan_multicast_rtp was. In the case of unicast a specific
IP address and port can be specified, along with optional RTP
engine and format in the form of:

UnicastRTP/<ip address>:<port>/<engine>/<format>

This can be useful for sending a copy of a media stream to
another application for processing.

Review: https://reviewboard.asterisk.org/r/3981/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@423004 65c4cc65-6c06-0410-ace0-fbb531ad65f3
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channels/chan_multicast_rtp.c → channels/chan_rtp.c
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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2009, Digium, Inc.
* Copyright (C) 2009 - 2014, Digium, Inc.
*
* Joshua Colp <jcolp@digium.com>
* Andreas 'MacBrody' Brodmann <andreas.brodmann@gmail.com>
......@@ -22,7 +22,7 @@
* \author Joshua Colp <jcolp@digium.com>
* \author Andreas 'MacBrody' Broadmann <andreas.brodmann@gmail.com>
*
* \brief Multicast RTP Paging Channel
* \brief RTP (Multicast and Unicast) Media Channel
*
* \ingroup channel_drivers
*/
......@@ -35,52 +35,61 @@
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include <fcntl.h>
#include <sys/signal.h>
#include "asterisk/lock.h"
#include "asterisk/channel.h"
#include "asterisk/config.h"
#include "asterisk/module.h"
#include "asterisk/pbx.h"
#include "asterisk/sched.h"
#include "asterisk/io.h"
#include "asterisk/acl.h"
#include "asterisk/callerid.h"
#include "asterisk/file.h"
#include "asterisk/cli.h"
#include "asterisk/app.h"
#include "asterisk/rtp_engine.h"
#include "asterisk/causes.h"
static const char tdesc[] = "Multicast RTP Paging Channel Driver";
#include "asterisk/format_cache.h"
/* Forward declarations */
static struct ast_channel *multicast_rtp_request(const char *type, struct ast_format_cap *cap, const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor, const char *data, int *cause);
static int multicast_rtp_call(struct ast_channel *ast, const char *dest, int timeout);
static int multicast_rtp_hangup(struct ast_channel *ast);
static struct ast_frame *multicast_rtp_read(struct ast_channel *ast);
static int multicast_rtp_write(struct ast_channel *ast, struct ast_frame *f);
static struct ast_channel *unicast_rtp_request(const char *type, struct ast_format_cap *cap, const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor, const char *data, int *cause);
static int rtp_call(struct ast_channel *ast, const char *dest, int timeout);
static int rtp_hangup(struct ast_channel *ast);
static struct ast_frame *rtp_read(struct ast_channel *ast);
static int rtp_write(struct ast_channel *ast, struct ast_frame *f);
/* Channel driver declaration */
/* Multicast channel driver declaration */
static struct ast_channel_tech multicast_rtp_tech = {
.type = "MulticastRTP",
.description = tdesc,
.description = "Multicast RTP Paging Channel Driver",
.requester = multicast_rtp_request,
.call = multicast_rtp_call,
.hangup = multicast_rtp_hangup,
.read = multicast_rtp_read,
.write = multicast_rtp_write,
.call = rtp_call,
.hangup = rtp_hangup,
.read = rtp_read,
.write = rtp_write,
};
/* Unicast channel driver declaration */
static struct ast_channel_tech unicast_rtp_tech = {
.type = "UnicastRTP",
.description = "Unicast RTP Media Channel Driver",
.requester = unicast_rtp_request,
.call = rtp_call,
.hangup = rtp_hangup,
.read = rtp_read,
.write = rtp_write,
};
/*! \brief Function called when we should read a frame from the channel */
static struct ast_frame *multicast_rtp_read(struct ast_channel *ast)
static struct ast_frame *rtp_read(struct ast_channel *ast)
{
return &ast_null_frame;
struct ast_rtp_instance *instance = ast_channel_tech_pvt(ast);
int fdno = ast_channel_fdno(ast);
switch (fdno) {
case 0:
return ast_rtp_instance_read(instance, 0);
default:
return &ast_null_frame;
}
}
/*! \brief Function called when we should write a frame to the channel */
static int multicast_rtp_write(struct ast_channel *ast, struct ast_frame *f)
static int rtp_write(struct ast_channel *ast, struct ast_frame *f)
{
struct ast_rtp_instance *instance = ast_channel_tech_pvt(ast);
......@@ -88,7 +97,7 @@ static int multicast_rtp_write(struct ast_channel *ast, struct ast_frame *f)
}
/*! \brief Function called when we should actually call the destination */
static int multicast_rtp_call(struct ast_channel *ast, const char *dest, int timeout)
static int rtp_call(struct ast_channel *ast, const char *dest, int timeout)
{
struct ast_rtp_instance *instance = ast_channel_tech_pvt(ast);
......@@ -98,7 +107,7 @@ static int multicast_rtp_call(struct ast_channel *ast, const char *dest, int tim
}
/*! \brief Function called when we should hang the channel up */
static int multicast_rtp_hangup(struct ast_channel *ast)
static int rtp_hangup(struct ast_channel *ast)
{
struct ast_rtp_instance *instance = ast_channel_tech_pvt(ast);
......@@ -109,41 +118,123 @@ static int multicast_rtp_hangup(struct ast_channel *ast)
return 0;
}
/*! \brief Function called when we should prepare to call the destination */
/*! \brief Function called when we should prepare to call the multicast destination */
static struct ast_channel *multicast_rtp_request(const char *type, struct ast_format_cap *cap, const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor, const char *data, int *cause)
{
char *tmp = ast_strdupa(data), *multicast_type = tmp, *destination, *control;
char *parse;
struct ast_rtp_instance *instance;
struct ast_sockaddr control_address;
struct ast_sockaddr destination_address;
struct ast_channel *chan;
struct ast_format_cap *caps = NULL;
struct ast_format *fmt = NULL;
AST_DECLARE_APP_ARGS(args,
AST_APP_ARG(type);
AST_APP_ARG(destination);
AST_APP_ARG(control);
);
if (ast_strlen_zero(data)) {
ast_log(LOG_ERROR, "A multicast type and destination must be given to the 'MulticastRTP' channel\n");
goto failure;
}
parse = ast_strdupa(data);
AST_NONSTANDARD_APP_ARGS(args, parse, '/');
fmt = ast_format_cap_get_format(cap, 0);
ast_sockaddr_setnull(&control_address);
/* If no type was given we can't do anything */
if (ast_strlen_zero(multicast_type)) {
if (!ast_strlen_zero(args.control) &&
!ast_sockaddr_parse(&control_address, args.control, PARSE_PORT_REQUIRE)) {
ast_log(LOG_ERROR, "Control address '%s' could not be parsed\n", args.control);
goto failure;
}
if (!(destination = strchr(tmp, '/'))) {
if (!ast_sockaddr_parse(&destination_address, args.destination,
PARSE_PORT_REQUIRE)) {
ast_log(LOG_ERROR, "Destination address '%s' could not be parsed\n", args.destination);
goto failure;
}
caps = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
if (!caps) {
goto failure;
}
if (!(instance = ast_rtp_instance_new("multicast", NULL, &control_address, args.type))) {
ast_log(LOG_ERROR, "Could not create RTP instance for sending media to '%s'\n", args.destination);
goto failure;
}
if (!(chan = ast_channel_alloc(1, AST_STATE_DOWN, "", "", "", "", "", assignedids, requestor, 0, "MulticastRTP/%p", instance))) {
ast_rtp_instance_destroy(instance);
goto failure;
}
ast_rtp_instance_set_channel_id(instance, ast_channel_uniqueid(chan));
ast_rtp_instance_set_remote_address(instance, &destination_address);
ast_channel_tech_set(chan, &multicast_rtp_tech);
ast_format_cap_append(caps, fmt, 0);
ast_channel_nativeformats_set(chan, caps);
ast_channel_set_writeformat(chan, fmt);
ast_channel_set_rawwriteformat(chan, fmt);
ast_channel_set_readformat(chan, fmt);
ast_channel_set_rawreadformat(chan, fmt);
ast_channel_tech_pvt_set(chan, instance);
ast_channel_unlock(chan);
ao2_ref(fmt, -1);
ao2_ref(caps, -1);
return chan;
failure:
ao2_cleanup(fmt);
ao2_cleanup(caps);
*cause = AST_CAUSE_FAILURE;
return NULL;
}
/*! \brief Function called when we should prepare to call the unicast destination */
static struct ast_channel *unicast_rtp_request(const char *type, struct ast_format_cap *cap, const struct ast_assigned_ids *assignedids, const struct ast_channel *requestor, const char *data, int *cause)
{
char *parse;
struct ast_rtp_instance *instance;
struct ast_sockaddr address;
struct ast_sockaddr local_address;
struct ast_channel *chan;
struct ast_format_cap *caps = NULL;
struct ast_format *fmt = NULL;
AST_DECLARE_APP_ARGS(args,
AST_APP_ARG(destination);
AST_APP_ARG(engine);
AST_APP_ARG(format);
);
if (ast_strlen_zero(data)) {
goto failure;
}
*destination++ = '\0';
parse = ast_strdupa(data);
AST_NONSTANDARD_APP_ARGS(args, parse, '/');
if (!ast_strlen_zero(args.format)) {
fmt = ast_format_cache_get(args.format);
} else {
fmt = ast_format_cap_get_format(cap, 0);
}
if ((control = strchr(destination, '/'))) {
*control++ = '\0';
if (!ast_sockaddr_parse(&control_address, control,
PARSE_PORT_REQUIRE)) {
goto failure;
}
if (!fmt) {
ast_log(LOG_ERROR, "No format specified for sending RTP to '%s'\n", args.destination);
goto failure;
}
if (!ast_sockaddr_parse(&destination_address, destination,
if (!ast_sockaddr_parse(&address, args.destination,
PARSE_PORT_REQUIRE)) {
ast_log(LOG_ERROR, "Destination '%s' could not be parsed\n", args.destination);
goto failure;
}
......@@ -152,18 +243,21 @@ static struct ast_channel *multicast_rtp_request(const char *type, struct ast_fo
goto failure;
}
if (!(instance = ast_rtp_instance_new("multicast", NULL, &control_address, multicast_type))) {
ast_ouraddrfor(&address, &local_address);
if (!(instance = ast_rtp_instance_new(args.engine, NULL, &local_address, NULL))) {
ast_log(LOG_ERROR, "Could not create RTP instance for sending media to '%s'\n", args.destination);
goto failure;
}
if (!(chan = ast_channel_alloc(1, AST_STATE_DOWN, "", "", "", "", "", assignedids, requestor, 0, "MulticastRTP/%p", instance))) {
if (!(chan = ast_channel_alloc(1, AST_STATE_DOWN, "", "", "", "", "", assignedids, requestor, 0, "UnicastRTP/%s-%p", args.destination, instance))) {
ast_rtp_instance_destroy(instance);
goto failure;
}
ast_rtp_instance_set_channel_id(instance, ast_channel_uniqueid(chan));
ast_rtp_instance_set_remote_address(instance, &destination_address);
ast_rtp_instance_set_remote_address(instance, &address);
ast_channel_set_fd(chan, 0, ast_rtp_instance_fd(instance, 0));
ast_channel_tech_set(chan, &multicast_rtp_tech);
ast_channel_tech_set(chan, &unicast_rtp_tech);
ast_format_cap_append(caps, fmt, 0);
ast_channel_nativeformats_set(chan, caps);
......@@ -174,6 +268,10 @@ static struct ast_channel *multicast_rtp_request(const char *type, struct ast_fo
ast_channel_tech_pvt_set(chan, instance);
pbx_builtin_setvar_helper(chan, "UNICASTRTP_LOCAL_ADDRESS", ast_sockaddr_stringify_addr(&local_address));
ast_rtp_instance_get_local_address(instance, &local_address);
pbx_builtin_setvar_helper(chan, "UNICASTRTP_LOCAL_PORT", ast_sockaddr_stringify_port(&local_address));
ast_channel_unlock(chan);
ao2_ref(fmt, -1);
......@@ -188,6 +286,20 @@ failure:
return NULL;
}
/*! \brief Function called when our module is unloaded */
static int unload_module(void)
{
ast_channel_unregister(&multicast_rtp_tech);
ao2_cleanup(multicast_rtp_tech.capabilities);
multicast_rtp_tech.capabilities = NULL;
ast_channel_unregister(&unicast_rtp_tech);
ao2_cleanup(unicast_rtp_tech.capabilities);
unicast_rtp_tech.capabilities = NULL;
return 0;
}
/*! \brief Function called when our module is loaded */
static int load_module(void)
{
......@@ -197,25 +309,25 @@ static int load_module(void)
ast_format_cap_append_by_type(multicast_rtp_tech.capabilities, AST_MEDIA_TYPE_UNKNOWN);
if (ast_channel_register(&multicast_rtp_tech)) {
ast_log(LOG_ERROR, "Unable to register channel class 'MulticastRTP'\n");
ao2_ref(multicast_rtp_tech.capabilities, -1);
multicast_rtp_tech.capabilities = NULL;
unload_module();
return AST_MODULE_LOAD_DECLINE;
}
return AST_MODULE_LOAD_SUCCESS;
}
/*! \brief Function called when our module is unloaded */
static int unload_module(void)
{
ast_channel_unregister(&multicast_rtp_tech);
ao2_ref(multicast_rtp_tech.capabilities, -1);
multicast_rtp_tech.capabilities = NULL;
if (!(unicast_rtp_tech.capabilities = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT))) {
unload_module();
return AST_MODULE_LOAD_DECLINE;
}
ast_format_cap_append_by_type(unicast_rtp_tech.capabilities, AST_MEDIA_TYPE_UNKNOWN);
if (ast_channel_register(&unicast_rtp_tech)) {
ast_log(LOG_ERROR, "Unable to register channel class 'UnicastRTP'\n");
unload_module();
return AST_MODULE_LOAD_DECLINE;
}
return 0;
return AST_MODULE_LOAD_SUCCESS;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "Multicast RTP Paging Channel",
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "RTP Media Channel",
.support_level = AST_MODULE_SUPPORT_CORE,
.load = load_module,
.unload = unload_module,
......
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