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12837a2611
It looks at raw audio data and emits messages when DTMF is detected. The dtmf detector is the same Goertzel implementation used in FreeSwitch and Asterisk. It is in the public domain.
73 lines
2 KiB
C
73 lines
2 KiB
C
/*
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* GStreamer - DTMF Detection
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*
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* Copyright 2009 Nokia Corporation
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* Copyright 2009 Collabora Ltd,
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* @author: Olivier Crete <olivier.crete@collabora.co.uk>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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*/
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#ifndef __GST_DTMF_DETECT_H__
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#define __GST_DTMF_DETECT_H__
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#include <gst/gst.h>
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#include <gst/base/gstbasetransform.h>
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#include "tone_detect.h"
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G_BEGIN_DECLS
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/* #define's don't like whitespacey bits */
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#define GST_TYPE_DTMF_DETECT \
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(gst_dtmf_detect_get_type())
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#define GST_DTMF_DETECT(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj), \
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GST_TYPE_DTMF_DETECT,GstDtmfDetect))
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#define GST_DTMF_DETECT_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass), \
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GST_TYPE_DTMF_DETECT,GstDtmfDetectClass))
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#define GST_IS_DTMF_DETECT(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_DTMF_DETECT))
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#define GST_IS_DTMF_DETECT_CLASS(obj) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_DTMF_DETECT))
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typedef struct _GstDtmfDetect GstDtmfDetect;
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typedef struct _GstDtmfDetectClass GstDtmfDetectClass;
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typedef struct _GstDtmfDetectPrivate GstDtmfDetectPrivate;
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struct _GstDtmfDetect
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{
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GstBaseTransform parent;
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gint rate;
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dtmf_detect_state_t dtmf_state;
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};
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struct _GstDtmfDetectClass
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{
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GstBaseTransformClass parent_class;
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};
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GType gst_dtmf_detect_get_type (void);
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gboolean gst_dtmf_detect_plugin_init (GstPlugin *plugin);
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G_END_DECLS
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#endif /* __GST_DTMF_DETECT_H__ */
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