This patch is the foundation of an entire new way of looking at media in Asterisk. The code present in this patch is everything required to complete phase1 of my Media Architecture proposal. For more information about this project visit the link below. https://wiki.asterisk.org/wiki/display/AST/Media+Architecture+Proposal The primary function of this patch is to convert all the usages of format bitfields in Asterisk to use the new format and format_cap APIs. Functionally no change in behavior should be present in this patch. Thanks to twilson and russell for all the time they spent reviewing these changes. Review: https://reviewboard.asterisk.org/r/1083/ git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@306010 65c4cc65-6c06-0410-ace0-fbb531ad65f3
296 lines
7.9 KiB
C
296 lines
7.9 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2006, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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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 Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief Network broadcast sound support channel driver
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*
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* \author Mark Spencer <markster@digium.com>
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*
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* \ingroup channel_drivers
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*/
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/*** MODULEINFO
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<depend>nbs</depend>
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***/
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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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#include <sys/socket.h>
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#include <sys/time.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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#include "asterisk/lock.h"
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#include "asterisk/channel.h"
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#include "asterisk/config.h"
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#include "asterisk/module.h"
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#include "asterisk/pbx.h"
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#include "asterisk/utils.h"
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static const char tdesc[] = "Network Broadcast Sound Driver";
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/* Only linear is allowed */
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static struct ast_format prefformat;
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static char context[AST_MAX_EXTENSION] = "default";
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static const char type[] = "NBS";
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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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struct ast_module_user *u; /*! for holding a reference to this module */
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};
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static struct ast_channel *nbs_request(const char *type, struct ast_format_cap *cap, const struct ast_channel *requestor, void *data, int *cause);
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static int nbs_call(struct ast_channel *ast, char *dest, int timeout);
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static int nbs_hangup(struct ast_channel *ast);
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static struct ast_frame *nbs_xread(struct ast_channel *ast);
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static int nbs_xwrite(struct ast_channel *ast, struct ast_frame *frame);
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static struct ast_channel_tech nbs_tech = {
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.type = type,
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.description = tdesc,
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.requester = nbs_request,
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.call = nbs_call,
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.hangup = nbs_hangup,
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.read = nbs_xread,
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.write = nbs_xwrite,
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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->tech_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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ast_debug(1, "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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ast_module_user_remove(p->u);
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ast_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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ast_copy_string(stream, data, sizeof(stream));
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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 = ast_calloc(1, sizeof(*p));
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if (p) {
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if (!ast_strlen_zero(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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ast_copy_string(p->stream, stream, sizeof(p->stream));
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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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ast_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->tech_pvt;
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ast_debug(1, "nbs_hangup(%s)\n", ast->name);
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if (!ast->tech_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->tech_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->tech_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.ptr = 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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p->fr.delivery.tv_sec = 0;
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p->fr.delivery.tv_usec = 0;
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ast_debug(1, "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->tech_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.format.id != (AST_FORMAT_SLINEAR)) {
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ast_log(LOG_WARNING, "Cannot handle frames in %s format\n", ast_getformatname(&frame->subclass.format));
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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.ptr, 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, const char *linkedid)
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{
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struct ast_channel *tmp;
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tmp = ast_channel_alloc(1, state, 0, 0, "", "s", context, linkedid, 0, "NBS/%s", i->stream);
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if (tmp) {
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tmp->tech = &nbs_tech;
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ast_channel_set_fd(tmp, 0, nbs_fd(i->nbs));
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ast_format_cap_add(tmp->nativeformats, &prefformat);
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ast_format_copy(&tmp->rawreadformat, &prefformat);
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ast_format_copy(&tmp->rawwriteformat, &prefformat);
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ast_format_copy(&tmp->writeformat, &prefformat);
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ast_format_copy(&tmp->readformat, &prefformat);
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if (state == AST_STATE_RING)
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tmp->rings = 1;
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tmp->tech_pvt = i;
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ast_copy_string(tmp->context, context, sizeof(tmp->context));
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ast_copy_string(tmp->exten, "s", sizeof(tmp->exten));
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ast_string_field_set(tmp, language, "");
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i->owner = tmp;
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i->u = ast_module_user_add(tmp);
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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(const char *type, struct ast_format_cap *cap, const struct ast_channel *requestor, void *data, int *cause)
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{
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struct nbs_pvt *p;
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struct ast_channel *tmp = NULL;
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if (!(ast_format_cap_iscompatible(cap, &prefformat))) {
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char tmp[256];
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ast_log(LOG_NOTICE, "Asked to get a channel of unsupported format '%s'\n", ast_getformatname_multiple(tmp, sizeof(tmp), cap));
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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, requestor ? requestor->linkedid : NULL);
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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(&nbs_tech);
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nbs_tech.capabilities = ast_format_cap_destroy(nbs_tech.capabilities);
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return 0;
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}
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static int load_module(void)
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{
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ast_format_set(&prefformat, AST_FORMAT_SLINEAR, 0);
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if (!(nbs_tech.capabilities == ast_format_cap_alloc())) {
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return -1;
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}
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ast_format_cap_add(nbs_tech.capabilities, &prefformat);
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/* Make sure we can register our channel type */
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if (ast_channel_register(&nbs_tech)) {
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ast_log(LOG_ERROR, "Unable to register channel class %s\n", type);
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return -1;
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}
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return 0;
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Network Broadcast Sound Support");
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