conf_chan_record.c

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/*
 * 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"
 
#include "asterisk/channel.h"
#include "asterisk/bridge.h"
#include "asterisk/format_cache.h"
#include "include/confbridge.h"
 
/* ------------------------------------------------------------------- */
 
static unsigned int name_sequence = 0;
 
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_assigned_ids *assignedids, const struct ast_channel *requestor, const char *data, int *cause)
{
    struct ast_channel *chan;
    const char *conf_name = data;
    RAII_VAR(struct ast_format_cap *, capabilities, NULL, ao2_cleanup);
    int generated_seqno = ast_atomic_fetchadd_int((int *) &name_sequence, +1);
 
    capabilities = ast_format_cap_alloc(AST_FORMAT_CAP_FLAG_DEFAULT);
    if (!capabilities) {
        return NULL;
    }
    ast_format_cap_append_by_type(capabilities, AST_MEDIA_TYPE_AUDIO);
 
    chan = ast_channel_alloc(1, AST_STATE_UP, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 0,
        "CBRec/%s-%08x",
        conf_name, (unsigned) generated_seqno);
    if (!chan) {
        return NULL;
    }
    if (ast_channel_add_bridge_role(chan, "recorder")) {
        ast_channel_unlock(chan);
        ast_channel_release(chan);
        return NULL;
    }
 
    ast_channel_tech_set(chan, conf_record_get_tech());
    ast_channel_nativeformats_set(chan, capabilities);
    ast_channel_set_writeformat(chan, ast_format_slin);
    ast_channel_set_rawwriteformat(chan, ast_format_slin);
    ast_channel_set_readformat(chan, ast_format_slin);
    ast_channel_set_rawreadformat(chan, ast_format_slin);
    ast_channel_unlock(chan);
    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,
    .properties = AST_CHAN_TP_INTERNAL,
};
 
struct ast_channel_tech *conf_record_get_tech(void)
{
    return &record_tech;
}