3 * Copyright (C) 2008 Collabora Limited
4 * Copyright (C) 2008 Nokia Corporation
5 * Contact: Youness Alaoui <youness.alaoui@collabora.co.uk>
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the
19 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 * Boston, MA 02111-1307, USA.
30 #include <gst/rtp/gstrtpbuffer.h>
31 #include "gstrtpdtmfdepay.h"
34 # define M_PI 3.14159265358979323846 /* pi */
38 #define DEFAULT_PACKET_INTERVAL 50 /* ms */
39 #define MIN_PACKET_INTERVAL 10 /* ms */
40 #define MAX_PACKET_INTERVAL 50 /* ms */
41 #define SAMPLE_RATE 8000
42 #define SAMPLE_SIZE 16
48 #define MIN_INTER_DIGIT_INTERVAL 100
49 #define MIN_PULSE_DURATION 250
50 #define MIN_DUTY_CYCLE (MIN_INTER_DIGIT_INTERVAL + MIN_PULSE_DURATION)
52 #define MIN_UNIT_TIME 0
53 #define MAX_UNIT_TIME 1000
54 #define DEFAULT_UNIT_TIME 0
56 #define DEFAULT_MAX_DURATION 0
58 typedef struct st_dtmf_key {
65 static const DTMF_KEY DTMF_KEYS[] = {
66 {"DTMF_KEY_EVENT_0", 0, 941, 1336},
67 {"DTMF_KEY_EVENT_1", 1, 697, 1209},
68 {"DTMF_KEY_EVENT_2", 2, 697, 1336},
69 {"DTMF_KEY_EVENT_3", 3, 697, 1477},
70 {"DTMF_KEY_EVENT_4", 4, 770, 1209},
71 {"DTMF_KEY_EVENT_5", 5, 770, 1336},
72 {"DTMF_KEY_EVENT_6", 6, 770, 1477},
73 {"DTMF_KEY_EVENT_7", 7, 852, 1209},
74 {"DTMF_KEY_EVENT_8", 8, 852, 1336},
75 {"DTMF_KEY_EVENT_9", 9, 852, 1477},
76 {"DTMF_KEY_EVENT_S", 10, 941, 1209},
77 {"DTMF_KEY_EVENT_P", 11, 941, 1477},
78 {"DTMF_KEY_EVENT_A", 12, 697, 1633},
79 {"DTMF_KEY_EVENT_B", 13, 770, 1633},
80 {"DTMF_KEY_EVENT_C", 14, 852, 1633},
81 {"DTMF_KEY_EVENT_D", 15, 941, 1633},
84 #define MAX_DTMF_EVENTS 16
97 DTMF_KEY_EVENT_STAR = 10,
98 DTMF_KEY_EVENT_POUND = 11,
99 DTMF_KEY_EVENT_A = 12,
100 DTMF_KEY_EVENT_B = 13,
101 DTMF_KEY_EVENT_C = 14,
102 DTMF_KEY_EVENT_D = 15,
105 /* elementfactory information */
106 static const GstElementDetails gst_rtp_dtmfdepay_details =
107 GST_ELEMENT_DETAILS ("RTP DTMF packet depayloader",
108 "Codec/Depayloader/Network",
109 "Generates DTMF Sound from telephone-event RTP packets",
110 "Youness Alaoui <youness.alaoui@collabora.co.uk>");
112 GST_DEBUG_CATEGORY_STATIC (gst_rtp_dtmf_depay_debug);
113 #define GST_CAT_DEFAULT gst_rtp_dtmf_depay_debug
135 static GstStaticPadTemplate gst_rtp_dtmf_depay_src_template =
136 GST_STATIC_PAD_TEMPLATE ("src",
139 GST_STATIC_CAPS ("audio/x-raw-int, "
142 "endianness = (int) " G_STRINGIFY (G_BYTE_ORDER) ", "
143 "signed = (boolean) true, "
144 "rate = (int) [0, MAX], "
145 "channels = (int) 1")
148 static GstStaticPadTemplate gst_rtp_dtmf_depay_sink_template =
149 GST_STATIC_PAD_TEMPLATE ("sink",
152 GST_STATIC_CAPS ("application/x-rtp, "
153 "media = (string) \"audio\", "
154 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
155 "clock-rate = (int) [ 0, MAX ], "
156 "encoding-name = (string) \"TELEPHONE-EVENT\"")
159 GST_BOILERPLATE (GstRtpDTMFDepay, gst_rtp_dtmf_depay, GstBaseRTPDepayload,
160 GST_TYPE_BASE_RTP_DEPAYLOAD);
162 static void gst_rtp_dtmf_depay_set_property (GObject * object, guint prop_id,
163 const GValue * value, GParamSpec * pspec);
164 static void gst_rtp_dtmf_depay_get_property (GObject * object, guint prop_id,
165 GValue * value, GParamSpec * pspec);
166 static GstBuffer *gst_rtp_dtmf_depay_process (GstBaseRTPDepayload * depayload,
168 gboolean gst_rtp_dtmf_depay_setcaps (GstBaseRTPDepayload * filter,
172 gst_rtp_dtmf_depay_base_init (gpointer klass)
174 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
176 gst_element_class_add_pad_template (element_class,
177 gst_static_pad_template_get (&gst_rtp_dtmf_depay_src_template));
178 gst_element_class_add_pad_template (element_class,
179 gst_static_pad_template_get (&gst_rtp_dtmf_depay_sink_template));
182 GST_DEBUG_CATEGORY_INIT (gst_rtp_dtmf_depay_debug,
183 "rtpdtmfdepay", 0, "rtpdtmfdepay element");
184 gst_element_class_set_details (element_class, &gst_rtp_dtmfdepay_details);
188 gst_rtp_dtmf_depay_class_init (GstRtpDTMFDepayClass * klass)
190 GObjectClass *gobject_class;
191 GstElementClass *gstelement_class;
192 GstBaseRTPDepayloadClass *gstbasertpdepayload_class;
194 gobject_class = (GObjectClass *) klass;
195 gstelement_class = (GstElementClass *) klass;
196 gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass;
198 parent_class = g_type_class_peek_parent (klass);
200 gobject_class->set_property =
201 GST_DEBUG_FUNCPTR (gst_rtp_dtmf_depay_set_property);
202 gobject_class->get_property =
203 GST_DEBUG_FUNCPTR (gst_rtp_dtmf_depay_get_property);
205 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_UNIT_TIME,
206 g_param_spec_uint ("unit-time", "Duration unittime",
207 "The smallest unit (ms) the duration must be a multiple of (0 disables it)", MIN_UNIT_TIME,
208 MAX_UNIT_TIME, DEFAULT_UNIT_TIME, G_PARAM_READWRITE));
210 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_MAX_DURATION,
211 g_param_spec_uint ("max-duration", "Maximum duration",
212 "The maxumimum duration (ms) of the outgoing soundpacket. "
213 "(0 = no limit)", 0, G_MAXUINT, DEFAULT_MAX_DURATION,
216 gstbasertpdepayload_class->process =
217 GST_DEBUG_FUNCPTR (gst_rtp_dtmf_depay_process);
218 gstbasertpdepayload_class->set_caps =
219 GST_DEBUG_FUNCPTR (gst_rtp_dtmf_depay_setcaps);
224 gst_rtp_dtmf_depay_init (GstRtpDTMFDepay * rtpdtmfdepay,
225 GstRtpDTMFDepayClass * klass)
227 rtpdtmfdepay->unit_time = DEFAULT_UNIT_TIME;
231 gst_rtp_dtmf_depay_set_property (GObject * object, guint prop_id,
232 const GValue * value, GParamSpec * pspec)
234 GstRtpDTMFDepay * rtpdtmfdepay;
236 rtpdtmfdepay = GST_RTP_DTMF_DEPAY (object);
240 rtpdtmfdepay->unit_time = g_value_get_uint (value);
242 case PROP_MAX_DURATION:
243 rtpdtmfdepay->max_duration = g_value_get_uint (value);
246 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
252 gst_rtp_dtmf_depay_get_property (GObject * object, guint prop_id,
253 GValue * value, GParamSpec * pspec)
255 GstRtpDTMFDepay * rtpdtmfdepay;
257 rtpdtmfdepay = GST_RTP_DTMF_DEPAY (object);
261 g_value_set_uint (value, rtpdtmfdepay->unit_time);
263 case PROP_MAX_DURATION:
264 g_value_set_uint (value, rtpdtmfdepay->max_duration);
267 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
273 gst_rtp_dtmf_depay_setcaps (GstBaseRTPDepayload * filter, GstCaps * caps)
276 GstStructure *structure = gst_caps_get_structure (caps, 0);
277 gint clock_rate = 8000; /* default */
279 gst_structure_get_int (structure, "clock-rate", &clock_rate);
280 filter->clock_rate = clock_rate;
282 srccaps = gst_caps_new_simple ("audio/x-raw-int",
283 "width", G_TYPE_INT, 16,
284 "depth", G_TYPE_INT, 16,
285 "endianness", G_TYPE_INT, G_BYTE_ORDER,
286 "signed", G_TYPE_BOOLEAN, TRUE,
287 "channels", G_TYPE_INT, 1,
288 "rate", G_TYPE_INT, clock_rate, NULL);
289 gst_pad_set_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (filter), srccaps);
290 gst_caps_unref (srccaps);
296 gst_dtmf_src_generate_tone(GstRtpDTMFDepay *rtpdtmfdepay,
297 GstRTPDTMFPayload payload, GstBuffer * buffer)
302 double amplitude, f1, f2;
303 double volume_factor;
304 DTMF_KEY key = DTMF_KEYS[payload.event];
305 guint32 clock_rate = 8000 /* default */;
306 GstBaseRTPDepayload * depayload = GST_BASE_RTP_DEPAYLOAD (rtpdtmfdepay);
309 clock_rate = depayload->clock_rate;
311 /* Create a buffer for the tone */
312 tone_size = (payload.duration*SAMPLE_SIZE*CHANNELS)/8;
313 GST_BUFFER_SIZE (buffer) = tone_size;
314 GST_BUFFER_MALLOCDATA (buffer) = g_malloc(tone_size);
315 GST_BUFFER_DATA (buffer) = GST_BUFFER_MALLOCDATA (buffer);
316 GST_BUFFER_DURATION (buffer) = payload.duration * GST_SECOND / clock_rate;
317 volume = payload.volume;
319 p = (gint16 *) GST_BUFFER_MALLOCDATA (buffer);
321 volume_factor = pow (10, (-volume) / 20);
324 * For each sample point we calculate 'x' as the
325 * the amplitude value.
327 for (i = 0; i < (tone_size / (SAMPLE_SIZE/8)); i++) {
329 * We add the fundamental frequencies together.
331 f1 = sin(2 * M_PI * key.low_frequency * (rtpdtmfdepay->sample / clock_rate));
332 f2 = sin(2 * M_PI * key.high_frequency * (rtpdtmfdepay->sample / clock_rate));
334 amplitude = (f1 + f2) / 2;
336 /* Adjust the volume */
337 amplitude *= volume_factor;
339 /* Make the [-1:1] interval into a [-32767:32767] interval */
342 /* Store it in the data buffer */
343 *(p++) = (gint16) amplitude;
345 (rtpdtmfdepay->sample)++;
351 gst_rtp_dtmf_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
354 GstRtpDTMFDepay *rtpdtmfdepay = NULL;
355 GstBuffer *outbuf = NULL;
357 guint8 *payload = NULL;
359 GstRTPDTMFPayload dtmf_payload;
361 GstStructure *structure = NULL;
362 GstMessage *dtmf_message = NULL;
364 rtpdtmfdepay = GST_RTP_DTMF_DEPAY (depayload);
366 if (!gst_rtp_buffer_validate (buf))
369 payload_len = gst_rtp_buffer_get_payload_len (buf);
370 payload = gst_rtp_buffer_get_payload (buf);
372 if (payload_len != sizeof(GstRTPDTMFPayload) )
375 memcpy (&dtmf_payload, payload, sizeof (GstRTPDTMFPayload));
377 if (dtmf_payload.event > MAX_EVENT)
381 marker = gst_rtp_buffer_get_marker (buf);
383 timestamp = gst_rtp_buffer_get_timestamp (buf);
385 dtmf_payload.duration = g_ntohs (dtmf_payload.duration);
387 /* clip to whole units of unit_time */
388 if (rtpdtmfdepay->unit_time)
390 guint unit_time_clock =
391 (rtpdtmfdepay->unit_time * depayload->clock_rate) / 1000;
392 if (dtmf_payload.duration % unit_time_clock)
394 /* Make sure we don't overflow the duration */
395 if (dtmf_payload.duration < G_MAXUINT16 - unit_time_clock)
396 dtmf_payload.duration += unit_time_clock -
397 (dtmf_payload.duration % unit_time_clock);
399 dtmf_payload.duration -= dtmf_payload.duration % unit_time_clock;
403 /* clip to max duration */
404 if (rtpdtmfdepay->max_duration)
406 guint max_duration_clock =
407 (rtpdtmfdepay->max_duration * depayload->clock_rate) / 1000;
409 if (max_duration_clock < G_MAXUINT16 &&
410 dtmf_payload.duration > max_duration_clock)
411 dtmf_payload.duration = max_duration_clock;
414 GST_DEBUG_OBJECT (depayload, "Received new RTP DTMF packet : "
415 "marker=%d - timestamp=%u - event=%d - duration=%d",
416 marker, timestamp, dtmf_payload.event, dtmf_payload.duration);
418 GST_DEBUG_OBJECT (depayload, "Previous information : timestamp=%u - duration=%d",
419 rtpdtmfdepay->previous_ts, rtpdtmfdepay->previous_duration);
422 if (marker || rtpdtmfdepay->previous_ts != timestamp) {
423 rtpdtmfdepay->sample = 0;
424 rtpdtmfdepay->previous_ts = timestamp;
425 rtpdtmfdepay->previous_duration = dtmf_payload.duration;
426 rtpdtmfdepay->first_gst_ts = GST_BUFFER_TIMESTAMP (buf);
428 structure = gst_structure_new ("dtmf-event",
429 "number", G_TYPE_INT, dtmf_payload.event,
430 "volume", G_TYPE_INT, dtmf_payload.volume,
431 "type", G_TYPE_INT, 1,
432 "method", G_TYPE_INT, 1,
435 dtmf_message = gst_message_new_element (GST_OBJECT (depayload), structure);
437 if (!gst_element_post_message (GST_ELEMENT (depayload), dtmf_message)) {
438 GST_ERROR_OBJECT (depayload, "Unable to send dtmf-event message to bus");
441 GST_ERROR_OBJECT (depayload, "Unable to create dtmf-event message");
444 GST_ERROR_OBJECT (depayload, "Unable to create dtmf-event structure");
447 guint16 duration = dtmf_payload.duration;
448 dtmf_payload.duration -= rtpdtmfdepay->previous_duration;
449 /* If late buffer, ignore */
450 if (duration > rtpdtmfdepay->previous_duration)
451 rtpdtmfdepay->previous_duration = duration;
454 GST_DEBUG_OBJECT (depayload, "new previous duration : %d - new duration : %d"
455 " - diff : %d - clock rate : %d - timestamp : %llu",
456 rtpdtmfdepay->previous_duration, dtmf_payload.duration,
457 (rtpdtmfdepay->previous_duration - dtmf_payload.duration),
458 depayload->clock_rate, GST_BUFFER_TIMESTAMP (buf));
460 /* If late or duplicate packet (like the redundant end packet). Ignore */
461 if (dtmf_payload.duration > 0) {
462 outbuf = gst_buffer_new ();
463 gst_dtmf_src_generate_tone(rtpdtmfdepay, dtmf_payload, outbuf);
466 GST_BUFFER_TIMESTAMP (outbuf) = rtpdtmfdepay->first_gst_ts +
467 (rtpdtmfdepay->previous_duration - dtmf_payload.duration) *
468 GST_SECOND / depayload->clock_rate;
469 GST_BUFFER_OFFSET (outbuf) =
470 (rtpdtmfdepay->previous_duration - dtmf_payload.duration) *
471 GST_SECOND / depayload->clock_rate;
472 GST_BUFFER_OFFSET_END (outbuf) = rtpdtmfdepay->previous_duration *
473 GST_SECOND / depayload->clock_rate;
475 GST_DEBUG_OBJECT (depayload, "timestamp : %llu - time %" GST_TIME_FORMAT,
476 GST_BUFFER_TIMESTAMP (buf), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
484 GST_ELEMENT_WARNING (rtpdtmfdepay, STREAM, DECODE,
485 ("Packet did not validate"), (NULL));
490 gst_rtp_dtmf_depay_plugin_init (GstPlugin * plugin)
492 return gst_element_register (plugin, "rtpdtmfdepay",
493 GST_RANK_MARGINAL, GST_TYPE_RTP_DTMF_DEPAY);