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FS-3570 receive side, update libteletone to track duration so it is less likely to double detect and push api changes down to freetdm

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This commit is contained in:
Anthony Minessale
2011-09-16 10:05:43 -05:00
parent d9ce90d7b9
commit a65794fb5e
14 changed files with 434 additions and 191 deletions
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161
libs/freetdm/src/libteletone_detect.c
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@@ -2,14 +2,62 @@
* libteletone
* Copyright (C) 2005-2011, Anthony Minessale II <anthm@freeswitch.org>
*
* Version: MPL 1.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is tone_detect.c - General telephony tone detection, and specific detection of DTMF.
*
*
* The Initial Developer of the Original Code is
* Stephen Underwood <steveu@coppice.org>
* Portions created by the Initial Developer are Copyright (C)
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* The the original interface designed by Steve Underwood was preserved to retain
*the optimizations when considering DTMF tones though the names were changed in the interest
* of namespace.
*
* Much less efficient expansion interface was added to allow for the detection of
* a single arbitrary tone combination which may also exceed 2 simultaneous tones.
* (controlled by compile time constant TELETONE_MAX_TONES)
*
* Copyright (C) 2006 Anthony Minessale II <anthm@freeswitch.org>
*
*
* libteletone_detect.c Tone Detection Code
*
*
*********************************************************************************
*
* Derived from 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.
*
*
* Exception:
* The author hereby grants the use of this source code under the
* following license if and only if the source code is distributed
* as part of the OpenZAP or FreeTDM library. Any use or distribution of this
* source code outside the scope of the OpenZAP or FreeTDM library will nullify the
* following license and reinact the MPL 1.1 as stated above.
*
* Copyright (c) 2007, Anthony Minessale II
* All rights reserved.
*
@@ -40,21 +88,6 @@
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*********************************************************************************
*
* Derived from 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 <libteletone_detect.h>
@@ -67,7 +100,8 @@
#include <time.h>
#include <fcntl.h>
#define LOW_ENG 10000000
#define ZC 2
static teletone_detection_descriptor_t dtmf_detect_row[GRID_FACTOR];
static teletone_detection_descriptor_t dtmf_detect_col[GRID_FACTOR];
static teletone_detection_descriptor_t dtmf_detect_row_2nd[GRID_FACTOR];
@@ -132,8 +166,8 @@ TELETONE_API(void) teletone_dtmf_detect_init (teletone_dtmf_detect_state_t *dtmf
dtmf_detect_state->current_sample = 0;
dtmf_detect_state->detected_digits = 0;
dtmf_detect_state->lost_digits = 0;
dtmf_detect_state->digits[0] = '\0';
dtmf_detect_state->mhit = 0;
dtmf_detect_state->digit = 0;
dtmf_detect_state->dur = 0;
}
TELETONE_API(void) teletone_multi_tone_init(teletone_multi_tone_t *mt, teletone_tone_map_t *map)
@@ -266,7 +300,7 @@ TELETONE_API(int) teletone_multi_tone_detect (teletone_multi_tone_t *mt,
}
TELETONE_API(int) teletone_dtmf_detect (teletone_dtmf_detect_state_t *dtmf_detect_state,
TELETONE_API(teletone_hit_type_t) teletone_dtmf_detect (teletone_dtmf_detect_state_t *dtmf_detect_state,
int16_t sample_buffer[],
int samples)
{
@@ -281,6 +315,7 @@ TELETONE_API(int) teletone_dtmf_detect (teletone_dtmf_detect_state_t *dtmf_detec
int best_col;
char hit;
int limit;
teletone_hit_type_t r = 0;
hit = 0;
for (sample = 0; sample < samples; sample = limit) {
@@ -317,6 +352,32 @@ TELETONE_API(int) teletone_dtmf_detect (teletone_dtmf_detect_state_t *dtmf_detec
}
if (dtmf_detect_state->zc > 0) {
if (dtmf_detect_state->energy < LOW_ENG && dtmf_detect_state->lenergy < LOW_ENG) {
if (!--dtmf_detect_state->zc) {
/* Reinitialise the detector for the next block */
dtmf_detect_state->hit1 = dtmf_detect_state->hit2 = 0;
for (i = 0; i < GRID_FACTOR; i++) {
goertzel_init (&dtmf_detect_state->row_out[i], &dtmf_detect_row[i]);
goertzel_init (&dtmf_detect_state->col_out[i], &dtmf_detect_col[i]);
goertzel_init (&dtmf_detect_state->row_out2nd[i], &dtmf_detect_row_2nd[i]);
goertzel_init (&dtmf_detect_state->col_out2nd[i], &dtmf_detect_col_2nd[i]);
}
dtmf_detect_state->dur -= samples;
return TT_HIT_END;
}
}
dtmf_detect_state->dur += samples;
dtmf_detect_state->lenergy = dtmf_detect_state->energy;
dtmf_detect_state->energy = 0.0;
dtmf_detect_state->current_sample = 0;
return TT_HIT_MIDDLE;
} else if (dtmf_detect_state->digit) {
return TT_HIT_END;
}
dtmf_detect_state->current_sample += (limit - sample);
if (dtmf_detect_state->current_sample < BLOCK_LEN) {
continue;
@@ -361,58 +422,54 @@ TELETONE_API(int) teletone_dtmf_detect (teletone_dtmf_detect_state_t *dtmf_detec
back to back differing digits. More importantly, it
can work with nasty phones that give a very wobbly start
to a digit. */
if (hit == dtmf_detect_state->hit3 && dtmf_detect_state->hit3 != dtmf_detect_state->hit2) {
dtmf_detect_state->mhit = hit;
if (! r && hit == dtmf_detect_state->hit3 && dtmf_detect_state->hit3 != dtmf_detect_state->hit2) {
dtmf_detect_state->digit_hits[(best_row << 2) + best_col]++;
dtmf_detect_state->detected_digits++;
if (dtmf_detect_state->current_digits < TELETONE_MAX_DTMF_DIGITS) {
dtmf_detect_state->digits[dtmf_detect_state->current_digits++] = hit;
dtmf_detect_state->digits[dtmf_detect_state->current_digits] = '\0';
dtmf_detect_state->digit = hit;
} else {
dtmf_detect_state->lost_digits++;
}
else
{
dtmf_detect_state->lost_digits++;
}
if (!dtmf_detect_state->zc) {
dtmf_detect_state->zc = ZC;
dtmf_detect_state->dur = 0;
r = TT_HIT_BEGIN;
}
}
}
}
dtmf_detect_state->hit1 = dtmf_detect_state->hit2;
dtmf_detect_state->hit2 = dtmf_detect_state->hit3;
dtmf_detect_state->hit3 = hit;
/* Reinitialise the detector for the next block */
for (i = 0; i < GRID_FACTOR; i++) {
goertzel_init (&dtmf_detect_state->row_out[i], &dtmf_detect_row[i]);
goertzel_init (&dtmf_detect_state->col_out[i], &dtmf_detect_col[i]);
goertzel_init (&dtmf_detect_state->row_out2nd[i], &dtmf_detect_row_2nd[i]);
goertzel_init (&dtmf_detect_state->col_out2nd[i], &dtmf_detect_col_2nd[i]);
}
dtmf_detect_state->energy = 0.0;
dtmf_detect_state->current_sample = 0;
}
if ((!dtmf_detect_state->mhit) || (dtmf_detect_state->mhit != hit)) {
dtmf_detect_state->mhit = 0;
return(0);
}
return (hit);
return r;
}
TELETONE_API(int) teletone_dtmf_get (teletone_dtmf_detect_state_t *dtmf_detect_state,
char *buf,
int max)
TELETONE_API(int) teletone_dtmf_get (teletone_dtmf_detect_state_t *dtmf_detect_state, char *buf, unsigned int *dur)
{
teletone_assert(dtmf_detect_state->current_digits <= TELETONE_MAX_DTMF_DIGITS);
if (!dtmf_detect_state->digit) {
return 0;
}
if (max > dtmf_detect_state->current_digits) {
max = dtmf_detect_state->current_digits;
*buf = dtmf_detect_state->digit;
*dur = dtmf_detect_state->dur;
if (!dtmf_detect_state->zc) {
dtmf_detect_state->dur = 0;
dtmf_detect_state->digit = 0;
}
if (max > 0) {
memcpy (buf, dtmf_detect_state->digits, max);
memmove (dtmf_detect_state->digits, dtmf_detect_state->digits + max, dtmf_detect_state->current_digits - max);
dtmf_detect_state->current_digits -= max;
}
buf[max] = '\0';
return max;
return 1;
}
/* For Emacs: