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74 lines
2.0 KiB
C
74 lines
2.0 KiB
C
/*
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* Copyright 2008-2010 Arsen Chaloyan
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* $Id: mpf_named_event.h 1474 2010-02-07 20:51:47Z achaloyan $
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*/
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#ifndef MPF_NAMED_EVENT_H
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#define MPF_NAMED_EVENT_H
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/**
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* @file mpf_named_event.h
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* @brief MPF Named Events (RFC4733/RFC2833)
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*/
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#include "mpf_codec_descriptor.h"
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APT_BEGIN_EXTERN_C
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/** Named event declaration */
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typedef struct mpf_named_event_frame_t mpf_named_event_frame_t;
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/** Named event (RFC4733/RFC2833, out-of-band DTMF) */
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struct mpf_named_event_frame_t {
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/** event (DTMF, tone) identifier */
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apr_uint32_t event_id: 8;
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#if (APR_IS_BIGENDIAN == 1)
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/** end of event */
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apr_uint32_t edge: 1;
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/** reserved */
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apr_uint32_t reserved: 1;
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/** tone volume */
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apr_uint32_t volume: 6;
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#else
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/** tone volume */
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apr_uint32_t volume: 6;
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/** reserved */
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apr_uint32_t reserved: 1;
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/** end of event */
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apr_uint32_t edge: 1;
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#endif
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/** event duration */
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apr_uint32_t duration: 16;
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};
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/** Create named event descriptor */
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MPF_DECLARE(mpf_codec_descriptor_t*) mpf_event_descriptor_create(apr_uint16_t sampling_rate, apr_pool_t *pool);
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/** Check whether the specified descriptor is named event one */
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MPF_DECLARE(apt_bool_t) mpf_event_descriptor_check(const mpf_codec_descriptor_t *descriptor);
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/** Convert DTMF character to event identifier */
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MPF_DECLARE(apr_uint32_t) mpf_dtmf_char_to_event_id(const char dtmf_char);
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/** Convert event identifier to DTMF character */
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MPF_DECLARE(char) mpf_event_id_to_dtmf_char(const apr_uint32_t event_id);
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APT_END_EXTERN_C
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#endif /* MPF_NAMED_EVENT_H */
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