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dtmf/spandsp: Move dtmfdetect to use libspandsp

Browse source 
Remove our copy of the tone_detect.c file and use the original
from libspandsp. Also move the element to the spandsp plugin.
This commit is contained in:
Olivier Crête 2013-01-09 19:59:16 -05:00
parent beb3c9c9be
commit c6dea5d09c
6 changed files with 3 additions and 961 deletions
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9
gst/dtmf/Makefile.am
View file

@ -1,21 +1,16 @@
plugin_LTLIBRARIES = libgstdtmf.la
libgstdtmf_la_SOURCES = gstdtmfsrc.c \
gstdtmfdetect.c \
gstrtpdtmfsrc.c \
gstrtpdtmfdepay.c \
tone_detect.c \
gstdtmf.c
noinst_HEADERS = gstdtmfsrc.h \
gstdtmfdetect.h \
gstrtpdtmfsrc.h \
gstrtpdtmfdepay.h \
gstdtmfcommon.h \
tone_detect.h
gstdtmfcommon.h
libgstdtmf_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_CFLAGS) \
-DEXTERN_BUF -DRTP_SUPPORT
libgstdtmf_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_CFLAGS)
libgstdtmf_la_LIBADD = $(GST_PLUGINS_BASE_LIBS) -lgstrtp-@GST_API_VERSION@ \
$(GST_BASE_LIBS) $(GST_LIBS) $(LIBM)
libgstdtmf_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)

4
gst/dtmf/gstdtmf.c
View file

@ -3,7 +3,6 @@
#include "config.h"
#endif
#include "gstdtmfdetect.h"
#include "gstdtmfsrc.h"
#include "gstrtpdtmfsrc.h"
#include "gstrtpdtmfdepay.h"
@ -12,9 +11,6 @@
static gboolean
plugin_init (GstPlugin * plugin)
{
if (!gst_dtmf_detect_plugin_init (plugin))
return FALSE;
if (!gst_dtmf_src_plugin_init (plugin))
return FALSE;

280
gst/dtmf/gstdtmfdetect.c
View file

@ -1,280 +0,0 @@
/*
* 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>
#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,
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,
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);
static gboolean gst_dtmf_detect_sink_event (GstBaseTransform * trans,
GstEvent * event);
G_DEFINE_TYPE (GstDtmfDetect, gst_dtmf_detect, GST_TYPE_BASE_TRANSFORM);
static void
gst_dtmf_detect_class_init (GstDtmfDetectClass * klass)
{
GstElementClass *gstelement_class;
GstBaseTransformClass *gstbasetransform_class;
gstelement_class = GST_ELEMENT_CLASS (klass);
gstbasetransform_class = (GstBaseTransformClass *) klass;
GST_DEBUG_CATEGORY_INIT (dtmf_detect_debug, "dtmfdetect", 0, "dtmfdetect");
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&srctemplate));
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",
"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);
gstbasetransform_class->sink_event =
GST_DEBUG_FUNCPTR (gst_dtmf_detect_sink_event);
}
static void
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);
gint dtmf_count;
gchar dtmfbuf[MAX_DTMF_DIGITS] = "";
gint i;
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;
gst_buffer_map (buf, &map, GST_MAP_READ);
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");
gst_buffer_unmap (buf, &map);
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
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;
}
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);
}

71
gst/dtmf/gstdtmfdetect.h
View file

@ -1,71 +0,0 @@
/*
* 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.
*
*/
#ifndef __GST_DTMF_DETECT_H__
#define __GST_DTMF_DETECT_H__
#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>
#include "tone_detect.h"
G_BEGIN_DECLS
/* #define's don't like whitespacey bits */
#define GST_TYPE_DTMF_DETECT \
(gst_dtmf_detect_get_type())
#define GST_DTMF_DETECT(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj), \
GST_TYPE_DTMF_DETECT,GstDtmfDetect))
#define GST_DTMF_DETECT_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass), \
GST_TYPE_DTMF_DETECT,GstDtmfDetectClass))
#define GST_IS_DTMF_DETECT(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_DTMF_DETECT))
#define GST_IS_DTMF_DETECT_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_DTMF_DETECT))
typedef struct _GstDtmfDetect GstDtmfDetect;
typedef struct _GstDtmfDetectClass GstDtmfDetectClass;
typedef struct _GstDtmfDetectPrivate GstDtmfDetectPrivate;
struct _GstDtmfDetect
{
GstBaseTransform parent;
dtmf_detect_state_t dtmf_state;
};
struct _GstDtmfDetectClass
{
GstBaseTransformClass parent_class;
};
GType gst_dtmf_detect_get_type (void);
gboolean gst_dtmf_detect_plugin_init (GstPlugin *plugin);
G_END_DECLS
#endif /* __GST_DTMF_DETECT_H__ */

503
gst/dtmf/tone_detect.c
View file

@ -1,503 +0,0 @@
/*
* DTMF Receiver module, part of:
* BSD Telephony Of Mexico "Zapata" Telecom Library, version 1.10 12/9/01
*
* Part of the "Zapata" Computer Telephony Technology.
*
* See http://www.bsdtelephony.com.mx
*
*
* The technologies, software, hardware, designs, drawings, scheumatics, board
* layouts and/or artwork, concepts, methodologies (including the use of all
* of these, and that which is derived from the use of all of these), all other
* intellectual properties contained herein, and all intellectual property
* rights have been and shall continue to be expressly for the benefit of all
* mankind, and are perpetually placed in the public domain, and may be used,
* copied, and/or modified by anyone, in any manner, for any legal purpose,
* without restriction.
*
* This module written by Stephen Underwood.
*/
/*
tone_detect.c - General telephony tone detection, and specific
detection of DTMF.
Copyright (C) 2001 Steve Underwood <steveu@coppice.org>
Despite my general liking of the GPL, I place this code in the
public domain for the benefit of all mankind - even the slimy
ones who might try to proprietize my work and use it to my
detriment.
*/
#include <math.h>
#include <string.h>
#include <stdio.h>
#include <time.h>
#include <fcntl.h>
#include "tone_detect.h"
#ifndef FALSE
#define FALSE 0
#endif
#ifndef TRUE
#define TRUE (!FALSE)
#endif
//#define USE_3DNOW
/* Basic DTMF specs:
*
* Minimum tone on = 40ms
* Minimum tone off = 50ms
* Maximum digit rate = 10 per second
* Normal twist <= 8dB accepted
* Reverse twist <= 4dB accepted
* S/N >= 15dB will detect OK
* Attenuation <= 26dB will detect OK
* Frequency tolerance +- 1.5% will detect, +-3.5% will reject
*/
#define SAMPLE_RATE 8000.0
#define DTMF_THRESHOLD 8.0e7
#define FAX_THRESHOLD 8.0e7
#define FAX_2ND_HARMONIC 2.0 /* 4dB */
#define DTMF_NORMAL_TWIST 6.3 /* 8dB */
#define DTMF_REVERSE_TWIST ((isradio) ? 4.0 : 2.5) /* 4dB normal */
#define DTMF_RELATIVE_PEAK_ROW 6.3 /* 8dB */
#define DTMF_RELATIVE_PEAK_COL 6.3 /* 8dB */
#define DTMF_2ND_HARMONIC_ROW ((isradio) ? 1.7 : 2.5) /* 4dB normal */
#define DTMF_2ND_HARMONIC_COL 63.1 /* 18dB */
static tone_detection_descriptor_t dtmf_detect_row[4];
static tone_detection_descriptor_t dtmf_detect_col[4];
static tone_detection_descriptor_t dtmf_detect_row_2nd[4];
static tone_detection_descriptor_t dtmf_detect_col_2nd[4];
static tone_detection_descriptor_t fax_detect;
static tone_detection_descriptor_t fax_detect_2nd;
static float dtmf_row[] = {
697.0, 770.0, 852.0, 941.0
};
static float dtmf_col[] = {
1209.0, 1336.0, 1477.0, 1633.0
};
static float fax_freq = 1100.0;
static char dtmf_positions[] = "123A" "456B" "789C" "*0#D";
static void
goertzel_init (goertzel_state_t * s, tone_detection_descriptor_t * t)
{
s->v2 = s->v3 = 0.0;
s->fac = t->fac;
}
/*- End of function --------------------------------------------------------*/
#if defined(USE_3DNOW)
static inline void
_dtmf_goertzel_update (goertzel_state_t * s, float x[], int samples)
{
int n;
float v;
int i;
float vv[16];
vv[4] = s[0].v2;
vv[5] = s[1].v2;
vv[6] = s[2].v2;
vv[7] = s[3].v2;
vv[8] = s[0].v3;
vv[9] = s[1].v3;
vv[10] = s[2].v3;
vv[11] = s[3].v3;
vv[12] = s[0].fac;
vv[13] = s[1].fac;
vv[14] = s[2].fac;
vv[15] = s[3].fac;
//v1 = s->v2;
//s->v2 = s->v3;
//s->v3 = s->fac*s->v2 - v1 + x[0];
__asm__ __volatile__ (" femms;\n"
" movq 16(%%edx),%%mm2;\n"
" movq 24(%%edx),%%mm3;\n"
" movq 32(%%edx),%%mm4;\n"
" movq 40(%%edx),%%mm5;\n"
" movq 48(%%edx),%%mm6;\n"
" movq 56(%%edx),%%mm7;\n"
" jmp 1f;\n"
" .align 32;\n"
" 1: ;\n"
" prefetch (%%eax);\n"
" movq %%mm3,%%mm1;\n"
" movq %%mm2,%%mm0;\n"
" movq %%mm5,%%mm3;\n"
" movq %%mm4,%%mm2;\n"
" pfmul %%mm7,%%mm5;\n"
" pfmul %%mm6,%%mm4;\n"
" pfsub %%mm1,%%mm5;\n"
" pfsub %%mm0,%%mm4;\n"
" movq (%%eax),%%mm0;\n"
" movq %%mm0,%%mm1;\n"
" punpckldq %%mm0,%%mm1;\n"
" add $4,%%eax;\n"
" pfadd %%mm1,%%mm5;\n"
" pfadd %%mm1,%%mm4;\n"
" dec %%ecx;\n"
" jnz 1b;\n"
" movq %%mm2,16(%%edx);\n"
" movq %%mm3,24(%%edx);\n"
" movq %%mm4,32(%%edx);\n"
" movq %%mm5,40(%%edx);\n"
" femms;\n"::"c" (samples), "a" (x), "d" (vv)
:"memory", "eax", "ecx");
s[0].v2 = vv[4];
s[1].v2 = vv[5];
s[2].v2 = vv[6];
s[3].v2 = vv[7];
s[0].v3 = vv[8];
s[1].v3 = vv[9];
s[2].v3 = vv[10];
s[3].v3 = vv[11];
}
#endif
/*- End of function --------------------------------------------------------*/
void
zap_goertzel_update (goertzel_state_t * s, int16_t x[], int samples)
{
int i;
float v1;
for (i = 0; i < samples; i++) {
v1 = s->v2;
s->v2 = s->v3;
s->v3 = s->fac * s->v2 - v1 + x[i];
}
}
/*- End of function --------------------------------------------------------*/
float
zap_goertzel_result (goertzel_state_t * s)
{
return s->v3 * s->v3 + s->v2 * s->v2 - s->v2 * s->v3 * s->fac;
}
/*- End of function --------------------------------------------------------*/
void
zap_dtmf_detect_init (dtmf_detect_state_t * s)
{
int i;
float theta;
s->hit1 = s->hit2 = 0;
for (i = 0; i < 4; i++) {
theta = 2.0 * G_PI * (dtmf_row[i] / SAMPLE_RATE);
dtmf_detect_row[i].fac = 2.0 * cos (theta);
theta = 2.0 * G_PI * (dtmf_col[i] / SAMPLE_RATE);
dtmf_detect_col[i].fac = 2.0 * cos (theta);
theta = 2.0 * G_PI * (dtmf_row[i] * 2.0 / SAMPLE_RATE);
dtmf_detect_row_2nd[i].fac = 2.0 * cos (theta);
theta = 2.0 * G_PI * (dtmf_col[i] * 2.0 / SAMPLE_RATE);
dtmf_detect_col_2nd[i].fac = 2.0 * cos (theta);
goertzel_init (&s->row_out[i], &dtmf_detect_row[i]);
goertzel_init (&s->col_out[i], &dtmf_detect_col[i]);
goertzel_init (&s->row_out2nd[i], &dtmf_detect_row_2nd[i]);
goertzel_init (&s->col_out2nd[i], &dtmf_detect_col_2nd[i]);
s->energy = 0.0;
}
/* Same for the fax dector */
theta = 2.0 * G_PI * (fax_freq / SAMPLE_RATE);
fax_detect.fac = 2.0 * cos (theta);
goertzel_init (&s->fax_tone, &fax_detect);
/* Same for the fax dector 2nd harmonic */
theta = 2.0 * G_PI * (fax_freq * 2.0 / SAMPLE_RATE);
fax_detect_2nd.fac = 2.0 * cos (theta);
goertzel_init (&s->fax_tone2nd, &fax_detect_2nd);
s->current_sample = 0;
s->detected_digits = 0;
s->lost_digits = 0;
s->digits[0] = '\0';
s->mhit = 0;
}
/*- End of function --------------------------------------------------------*/
int
zap_dtmf_detect (dtmf_detect_state_t * s,
int16_t amp[], int samples, int isradio)
{
float row_energy[4];
float col_energy[4];
float fax_energy;
float fax_energy_2nd;
float famp;
float v1;
int i;
int j;
int sample;
int best_row;
int best_col;
int hit;
int limit;
hit = 0;
for (sample = 0; sample < samples; sample = limit) {
/* 102 is optimised to meet the DTMF specs. */
if ((samples - sample) >= (102 - s->current_sample))
limit = sample + (102 - s->current_sample);
else
limit = samples;
#if defined(USE_3DNOW)
_dtmf_goertzel_update (s->row_out, amp + sample, limit - sample);
_dtmf_goertzel_update (s->col_out, amp + sample, limit - sample);
_dtmf_goertzel_update (s->row_out2nd, amp + sample, limit2 - sample);
_dtmf_goertzel_update (s->col_out2nd, amp + sample, limit2 - sample);
/* XXX Need to fax detect for 3dnow too XXX */
#warning "Fax Support Broken"
#else
/* The following unrolled loop takes only 35% (rough estimate) of the
time of a rolled loop on the machine on which it was developed */
for (j = sample; j < limit; j++) {
famp = amp[j];
s->energy += famp * famp;
/* With GCC 2.95, the following unrolled code seems to take about 35%
(rough estimate) as long as a neat little 0-3 loop */
v1 = s->row_out[0].v2;
s->row_out[0].v2 = s->row_out[0].v3;
s->row_out[0].v3 = s->row_out[0].fac * s->row_out[0].v2 - v1 + famp;
v1 = s->col_out[0].v2;
s->col_out[0].v2 = s->col_out[0].v3;
s->col_out[0].v3 = s->col_out[0].fac * s->col_out[0].v2 - v1 + famp;
v1 = s->row_out[1].v2;
s->row_out[1].v2 = s->row_out[1].v3;
s->row_out[1].v3 = s->row_out[1].fac * s->row_out[1].v2 - v1 + famp;
v1 = s->col_out[1].v2;
s->col_out[1].v2 = s->col_out[1].v3;
s->col_out[1].v3 = s->col_out[1].fac * s->col_out[1].v2 - v1 + famp;
v1 = s->row_out[2].v2;
s->row_out[2].v2 = s->row_out[2].v3;
s->row_out[2].v3 = s->row_out[2].fac * s->row_out[2].v2 - v1 + famp;
v1 = s->col_out[2].v2;
s->col_out[2].v2 = s->col_out[2].v3;
s->col_out[2].v3 = s->col_out[2].fac * s->col_out[2].v2 - v1 + famp;
v1 = s->row_out[3].v2;
s->row_out[3].v2 = s->row_out[3].v3;
s->row_out[3].v3 = s->row_out[3].fac * s->row_out[3].v2 - v1 + famp;
v1 = s->col_out[3].v2;
s->col_out[3].v2 = s->col_out[3].v3;
s->col_out[3].v3 = s->col_out[3].fac * s->col_out[3].v2 - v1 + famp;
v1 = s->col_out2nd[0].v2;
s->col_out2nd[0].v2 = s->col_out2nd[0].v3;
s->col_out2nd[0].v3 =
s->col_out2nd[0].fac * s->col_out2nd[0].v2 - v1 + famp;
v1 = s->row_out2nd[0].v2;
s->row_out2nd[0].v2 = s->row_out2nd[0].v3;
s->row_out2nd[0].v3 =
s->row_out2nd[0].fac * s->row_out2nd[0].v2 - v1 + famp;
v1 = s->col_out2nd[1].v2;
s->col_out2nd[1].v2 = s->col_out2nd[1].v3;
s->col_out2nd[1].v3 =
s->col_out2nd[1].fac * s->col_out2nd[1].v2 - v1 + famp;
v1 = s->row_out2nd[1].v2;
s->row_out2nd[1].v2 = s->row_out2nd[1].v3;
s->row_out2nd[1].v3 =
s->row_out2nd[1].fac * s->row_out2nd[1].v2 - v1 + famp;
v1 = s->col_out2nd[2].v2;
s->col_out2nd[2].v2 = s->col_out2nd[2].v3;
s->col_out2nd[2].v3 =
s->col_out2nd[2].fac * s->col_out2nd[2].v2 - v1 + famp;
v1 = s->row_out2nd[2].v2;
s->row_out2nd[2].v2 = s->row_out2nd[2].v3;
s->row_out2nd[2].v3 =
s->row_out2nd[2].fac * s->row_out2nd[2].v2 - v1 + famp;
v1 = s->col_out2nd[3].v2;
s->col_out2nd[3].v2 = s->col_out2nd[3].v3;
s->col_out2nd[3].v3 =
s->col_out2nd[3].fac * s->col_out2nd[3].v2 - v1 + famp;
v1 = s->row_out2nd[3].v2;
s->row_out2nd[3].v2 = s->row_out2nd[3].v3;
s->row_out2nd[3].v3 =
s->row_out2nd[3].fac * s->row_out2nd[3].v2 - v1 + famp;
/* Update fax tone */
v1 = s->fax_tone.v2;
s->fax_tone.v2 = s->fax_tone.v3;
s->fax_tone.v3 = s->fax_tone.fac * s->fax_tone.v2 - v1 + famp;
v1 = s->fax_tone.v2;
s->fax_tone2nd.v2 = s->fax_tone2nd.v3;
s->fax_tone2nd.v3 = s->fax_tone2nd.fac * s->fax_tone2nd.v2 - v1 + famp;
}
#endif
s->current_sample += (limit - sample);
if (s->current_sample < 102)
continue;
/* Detect the fax energy, too */
fax_energy = zap_goertzel_result (&s->fax_tone);
/* We are at the end of a DTMF detection block */
/* Find the peak row and the peak column */
row_energy[0] = zap_goertzel_result (&s->row_out[0]);
col_energy[0] = zap_goertzel_result (&s->col_out[0]);
for (best_row = best_col = 0, i = 1; i < 4; i++) {
row_energy[i] = zap_goertzel_result (&s->row_out[i]);
if (row_energy[i] > row_energy[best_row])
best_row = i;
col_energy[i] = zap_goertzel_result (&s->col_out[i]);
if (col_energy[i] > col_energy[best_col])
best_col = i;
}
hit = 0;
/* Basic signal level test and the twist test */
if (row_energy[best_row] >= DTMF_THRESHOLD
&&
col_energy[best_col] >= DTMF_THRESHOLD
&&
col_energy[best_col] < row_energy[best_row] * DTMF_REVERSE_TWIST
&& col_energy[best_col] * DTMF_NORMAL_TWIST > row_energy[best_row]) {
/* Relative peak test */
for (i = 0; i < 4; i++) {
if ((i != best_col
&& col_energy[i] * DTMF_RELATIVE_PEAK_COL >
col_energy[best_col])
|| (i != best_row
&& row_energy[i] * DTMF_RELATIVE_PEAK_ROW >
row_energy[best_row])) {
break;
}
}
/* ... and second harmonic test */
if (i >= 4
&&
(row_energy[best_row] + col_energy[best_col]) > 42.0 * s->energy
&&
zap_goertzel_result (&s->col_out2nd[best_col]) *
DTMF_2ND_HARMONIC_COL < col_energy[best_col]
&& zap_goertzel_result (&s->row_out2nd[best_row]) *
DTMF_2ND_HARMONIC_ROW < row_energy[best_row]) {
hit = dtmf_positions[(best_row << 2) + best_col];
/* Look for two successive similar results */
/* The logic in the next test is:
We need two successive identical clean detects, with
something different preceeding it. This can work with
back to back differing digits. More importantly, it
can work with nasty phones that give a very wobbly start
to a digit. */
if (hit == s->hit3 && s->hit3 != s->hit2) {
s->mhit = hit;
s->digit_hits[(best_row << 2) + best_col]++;
s->detected_digits++;
if (s->current_digits < MAX_DTMF_DIGITS) {
s->digits[s->current_digits++] = hit;
s->digits[s->current_digits] = '\0';
} else {
s->lost_digits++;
}
}
}
}
if (!hit && (fax_energy >= FAX_THRESHOLD)
&& (fax_energy > s->energy * 21.0)) {
fax_energy_2nd = zap_goertzel_result (&s->fax_tone2nd);
if (fax_energy_2nd * FAX_2ND_HARMONIC < fax_energy) {
#if 0
printf ("Fax energy/Second Harmonic: %f/%f\n", fax_energy,
fax_energy_2nd);
#endif
/* XXX Probably need better checking than just this the energy XXX */
hit = 'f';
s->fax_hits++;
} /* Don't reset fax hits counter */
} else {
if (s->fax_hits > 5) {
s->mhit = 'f';
s->detected_digits++;
if (s->current_digits < MAX_DTMF_DIGITS) {
s->digits[s->current_digits++] = hit;
s->digits[s->current_digits] = '\0';
} else {
s->lost_digits++;
}
}
s->fax_hits = 0;
}
s->hit1 = s->hit2;
s->hit2 = s->hit3;
s->hit3 = hit;
/* Reinitialise the detector for the next block */
for (i = 0; i < 4; i++) {
goertzel_init (&s->row_out[i], &dtmf_detect_row[i]);
goertzel_init (&s->col_out[i], &dtmf_detect_col[i]);
goertzel_init (&s->row_out2nd[i], &dtmf_detect_row_2nd[i]);
goertzel_init (&s->col_out2nd[i], &dtmf_detect_col_2nd[i]);
}
goertzel_init (&s->fax_tone, &fax_detect);
goertzel_init (&s->fax_tone2nd, &fax_detect_2nd);
s->energy = 0.0;
s->current_sample = 0;
}
if ((!s->mhit) || (s->mhit != hit)) {
s->mhit = 0;
return (0);
}
return (hit);
}
/*- End of function --------------------------------------------------------*/
int
zap_dtmf_get (dtmf_detect_state_t * s, char *buf, int max)
{
if (max > s->current_digits)
max = s->current_digits;
if (max > 0) {
memcpy (buf, s->digits, max);
memmove (s->digits, s->digits + max, s->current_digits - max);
s->current_digits -= max;
}
buf[max] = '\0';
return max;
}
/*- End of function --------------------------------------------------------*/
/*- End of file ------------------------------------------------------------*/

95
gst/dtmf/tone_detect.h
View file

@ -1,95 +0,0 @@
/*
* Header file for DTMF Receiver module, part of:
* BSD Telephony Of Mexico "Zapata" Telecom Library, version 1.10 12/9/01
*
* Part of the "Zapata" Computer Telephony Technology.
*
* See http://www.bsdtelephony.com.mx
*
*
* The technologies, software, hardware, designs, drawings, scheumatics, board
* layouts and/or artwork, concepts, methodologies (including the use of all
* of these, and that which is derived from the use of all of these), all other
* intellectual properties contained herein, and all intellectual property
* rights have been and shall continue to be expressly for the benefit of all
* mankind, and are perpetually placed in the public domain, and may be used,
* copied, and/or modified by anyone, in any manner, for any legal purpose,
* without restriction.
*
* This module written by Stephen Underwood.
*/
/*
tone_detect.h - General telephony tone detection, and specific
detection of DTMF.
Copyright (C) 2001 Steve Underwood <steveu@coppice.org>
Despite my general liking of the GPL, I place this code in the
public domain for the benefit of all mankind - even the slimy
ones who might try to proprietize my work and use it to my
detriment.
*/
#ifndef __TONE_DETECT_H__
#define __TONE_DETECT_H__
#include "_stdint.h"
#include <glib.h>
typedef struct
{
float v2;
float v3;
float fac;
} goertzel_state_t;
#define MAX_DTMF_DIGITS 128
typedef struct
{
int hit1;
int hit2;
int hit3;
int hit4;
int mhit;
goertzel_state_t row_out[4];
goertzel_state_t col_out[4];
goertzel_state_t row_out2nd[4];
goertzel_state_t col_out2nd[4];
goertzel_state_t fax_tone;
goertzel_state_t fax_tone2nd;
float energy;
int current_sample;
char digits[MAX_DTMF_DIGITS + 1];
int current_digits;
int detected_digits;
int lost_digits;
int digit_hits[16];
int fax_hits;
} dtmf_detect_state_t;
typedef struct
{
float fac;
} tone_detection_descriptor_t;
void zap_goertzel_update(goertzel_state_t *s,
gint16 x[],
int samples);
float zap_goertzel_result (goertzel_state_t *s);
void zap_dtmf_detect_init (dtmf_detect_state_t *s);
int zap_dtmf_detect (dtmf_detect_state_t *s,
gint16 amp[],
int samples,
int isradio);
int zap_dtmf_get (dtmf_detect_state_t *s,
char *buf,
int max);
#endif /* __TONE_DETECT_H__ */
/*- End of file ------------------------------------------------------------*/