gstreamer/gst/dtmf/gstdtmfdetect.c

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/*
* GStreamer - DTMF Detection
*
* Copyright 2009 Nokia Corporation
* Copyright 2009 Collabora Ltd,
* @author: Olivier Crete <olivier.crete@collabora.co.uk>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
/**
* SECTION:element-dtmfdetect
* @short_description: Detects DTMF tones
*
* This element will detect DTMF tones and emit messages.
*
* The message is called <classname>&quot;dtmf-event&quot;</classname> and has
* the following fields:
* <itemizedlist>
* <listitem>
* <para>
* gint <classname>type</classname> (0-1):
* The application uses this field to specify which of the two methods
* specified in RFC 2833 to use. The value should be 0 for tones and 1 for
* named events. Tones are specified by their frequencies and events are
* specfied by their number. This element can only take events as input.
* Do not confuse with "method" which specified the output.
* </para>
* </listitem>
* <listitem>
* <para>
* gint <classname>number</classname> (0-16):
* The event number.
* </para>
* </listitem>
* <listitem>
* <para>
* gint <classname>method</classname> (2):
* This field will always been 2 (ie sound) from this element.
* </para>
* </listitem>
* </itemizedlist>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstdtmfdetect.h"
#include <string.h>
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#include <gst/audio/audio.h>
GST_DEBUG_CATEGORY (dtmf_detect_debug);
#define GST_CAT_DEFAULT (dtmf_detect_debug)
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/x-raw, "
"format = (string) \"" GST_AUDIO_NE (S16) "\", "
"rate = (int) 8000, " "channels = (int) 1")
);
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("audio/x-raw, "
"format = (string) \"" GST_AUDIO_NE (S16) "\", "
"rate = (int) 8000, " "channels = (int) 1")
);
/* signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
};
static gboolean gst_dtmf_detect_set_caps (GstBaseTransform * trans,
GstCaps * incaps, GstCaps * outcaps);
static GstFlowReturn gst_dtmf_detect_transform_ip (GstBaseTransform * trans,
GstBuffer * buf);
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static gboolean gst_dtmf_detect_sink_event (GstBaseTransform * trans,
GstEvent * event);
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G_DEFINE_TYPE (GstDtmfDetect, gst_dtmf_detect, GST_TYPE_BASE_TRANSFORM);
static void
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gst_dtmf_detect_class_init (GstDtmfDetectClass * klass)
{
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GstElementClass *gstelement_class;
GstBaseTransformClass *gstbasetransform_class;
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gstelement_class = GST_ELEMENT_CLASS (klass);
gstbasetransform_class = (GstBaseTransformClass *) klass;
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GST_DEBUG_CATEGORY_INIT (dtmf_detect_debug, "dtmfdetect", 0, "dtmfdetect");
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gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&srctemplate));
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gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&sinktemplate));
gst_element_class_set_static_metadata (gstelement_class,
"DTMF detector element", "Filter/Analyzer/Audio",
"This element detects DTMF tones",
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"Olivier Crete <olivier.crete@collabora.com>");
gstbasetransform_class->set_caps =
GST_DEBUG_FUNCPTR (gst_dtmf_detect_set_caps);
gstbasetransform_class->transform_ip =
GST_DEBUG_FUNCPTR (gst_dtmf_detect_transform_ip);
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gstbasetransform_class->sink_event =
GST_DEBUG_FUNCPTR (gst_dtmf_detect_sink_event);
}
static void
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gst_dtmf_detect_init (GstDtmfDetect * dtmfdetect)
{
gst_base_transform_set_passthrough (GST_BASE_TRANSFORM (dtmfdetect), TRUE);
gst_base_transform_set_gap_aware (GST_BASE_TRANSFORM (dtmfdetect), TRUE);
}
static gboolean
gst_dtmf_detect_set_caps (GstBaseTransform * trans, GstCaps * incaps,
GstCaps * outcaps)
{
GstDtmfDetect *self = GST_DTMF_DETECT (trans);
zap_dtmf_detect_init (&self->dtmf_state);
return TRUE;
}
static GstFlowReturn
gst_dtmf_detect_transform_ip (GstBaseTransform * trans, GstBuffer * buf)
{
GstDtmfDetect *self = GST_DTMF_DETECT (trans);
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gint dtmf_count;
gchar dtmfbuf[MAX_DTMF_DIGITS] = "";
gint i;
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GstMapInfo map;
if (GST_BUFFER_IS_DISCONT (buf))
zap_dtmf_detect_init (&self->dtmf_state);
if (GST_BUFFER_FLAG_IS_SET (buf, GST_BUFFER_FLAG_GAP))
return GST_FLOW_OK;
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gst_buffer_map (buf, &map, GST_MAP_READ);
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zap_dtmf_detect (&self->dtmf_state, (gint16 *) map.data, map.size / 2, FALSE);
dtmf_count = zap_dtmf_get (&self->dtmf_state, dtmfbuf, MAX_DTMF_DIGITS);
if (dtmf_count)
GST_DEBUG_OBJECT (self, "Got %d DTMF events: %s", dtmf_count, dtmfbuf);
else
GST_LOG_OBJECT (self, "Got no DTMF events");
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gst_buffer_unmap (buf, &map);
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for (i = 0; i < dtmf_count; i++) {
GstMessage *dtmf_message = NULL;
GstStructure *structure;
gint dtmf_payload_event;
GST_DEBUG_OBJECT (self, "Got DTMF event %c", dtmfbuf[i]);
switch (dtmfbuf[i]) {
case '0':
dtmf_payload_event = 0;
break;
case '1':
dtmf_payload_event = 1;
break;
case '2':
dtmf_payload_event = 2;
break;
case '3':
dtmf_payload_event = 3;
break;
case '4':
dtmf_payload_event = 4;
break;
case '5':
dtmf_payload_event = 5;
break;
case '6':
dtmf_payload_event = 6;
break;
case '7':
dtmf_payload_event = 7;
break;
case '8':
dtmf_payload_event = 8;
break;
case '9':
dtmf_payload_event = 9;
break;
case '*':
dtmf_payload_event = 10;
break;
case '#':
dtmf_payload_event = 11;
break;
case 'A':
dtmf_payload_event = 12;
break;
case 'B':
dtmf_payload_event = 13;
break;
case 'C':
dtmf_payload_event = 14;
break;
case 'D':
dtmf_payload_event = 15;
break;
default:
continue;
}
structure = gst_structure_new ("dtmf-event",
"type", G_TYPE_INT, 1,
"number", G_TYPE_INT, dtmf_payload_event,
"method", G_TYPE_INT, 2, NULL);
dtmf_message = gst_message_new_element (GST_OBJECT (self), structure);
gst_element_post_message (GST_ELEMENT (self), dtmf_message);
}
return GST_FLOW_OK;
}
static gboolean
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gst_dtmf_detect_sink_event (GstBaseTransform * trans, GstEvent * event)
{
GstDtmfDetect *self = GST_DTMF_DETECT (trans);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_FLUSH_STOP:
zap_dtmf_detect_init (&self->dtmf_state);
break;
default:
break;
}
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return GST_BASE_TRANSFORM_CLASS (gst_dtmf_detect_parent_class)->sink_event
(trans, event);
}
gboolean
gst_dtmf_detect_plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "dtmfdetect",
GST_RANK_MARGINAL, GST_TYPE_DTMF_DETECT);
}