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 typedef struct st_dtmf_key {
63 static const DTMF_KEY DTMF_KEYS[] = {
64 {"DTMF_KEY_EVENT_0", 0, 941, 1336},
65 {"DTMF_KEY_EVENT_1", 1, 697, 1209},
66 {"DTMF_KEY_EVENT_2", 2, 697, 1336},
67 {"DTMF_KEY_EVENT_3", 3, 697, 1477},
68 {"DTMF_KEY_EVENT_4", 4, 770, 1209},
69 {"DTMF_KEY_EVENT_5", 5, 770, 1336},
70 {"DTMF_KEY_EVENT_6", 6, 770, 1477},
71 {"DTMF_KEY_EVENT_7", 7, 852, 1209},
72 {"DTMF_KEY_EVENT_8", 8, 852, 1336},
73 {"DTMF_KEY_EVENT_9", 9, 852, 1477},
74 {"DTMF_KEY_EVENT_S", 10, 941, 1209},
75 {"DTMF_KEY_EVENT_P", 11, 941, 1477},
76 {"DTMF_KEY_EVENT_A", 12, 697, 1633},
77 {"DTMF_KEY_EVENT_B", 13, 770, 1633},
78 {"DTMF_KEY_EVENT_C", 14, 852, 1633},
79 {"DTMF_KEY_EVENT_D", 15, 941, 1633},
82 #define MAX_DTMF_EVENTS 16
95 DTMF_KEY_EVENT_STAR = 10,
96 DTMF_KEY_EVENT_POUND = 11,
97 DTMF_KEY_EVENT_A = 12,
98 DTMF_KEY_EVENT_B = 13,
99 DTMF_KEY_EVENT_C = 14,
100 DTMF_KEY_EVENT_D = 15,
103 /* elementfactory information */
104 static const GstElementDetails gst_rtp_dtmfdepay_details =
105 GST_ELEMENT_DETAILS ("RTP DTMF packet depayloader",
106 "Codec/Depayloader/Network",
107 "Generates DTMF Sound from telephone-event RTP packets",
108 "Youness Alaoui <youness.alaoui@collabora.co.uk>");
110 GST_DEBUG_CATEGORY_STATIC (gst_rtp_dtmf_depay_debug);
111 #define GST_CAT_DEFAULT gst_rtp_dtmf_depay_debug
132 static GstStaticPadTemplate gst_rtp_dtmf_depay_src_template =
133 GST_STATIC_PAD_TEMPLATE ("src",
136 GST_STATIC_CAPS ("audio/x-raw-int, "
139 "endianness = (int) " G_STRINGIFY (G_BYTE_ORDER) ", "
140 "signed = (boolean) true, "
141 "rate = (int) [0, MAX], "
142 "channels = (int) 1")
145 static GstStaticPadTemplate gst_rtp_dtmf_depay_sink_template =
146 GST_STATIC_PAD_TEMPLATE ("sink",
149 GST_STATIC_CAPS ("application/x-rtp, "
150 "media = (string) \"audio\", "
151 "payload = (int) " GST_RTP_PAYLOAD_DYNAMIC_STRING ", "
152 "clock-rate = (int) [ 0, MAX ], "
153 "encoding-name = (string) \"TELEPHONE-EVENT\"")
156 GST_BOILERPLATE (GstRtpDTMFDepay, gst_rtp_dtmf_depay, GstBaseRTPDepayload,
157 GST_TYPE_BASE_RTP_DEPAYLOAD);
159 static void gst_rtp_dtmf_depay_set_property (GObject * object, guint prop_id,
160 const GValue * value, GParamSpec * pspec);
161 static void gst_rtp_dtmf_depay_get_property (GObject * object, guint prop_id,
162 GValue * value, GParamSpec * pspec);
163 static GstBuffer *gst_rtp_dtmf_depay_process (GstBaseRTPDepayload * depayload,
165 gboolean gst_rtp_dtmf_depay_setcaps (GstBaseRTPDepayload * filter,
169 gst_rtp_dtmf_depay_base_init (gpointer klass)
171 GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
173 gst_element_class_add_pad_template (element_class,
174 gst_static_pad_template_get (&gst_rtp_dtmf_depay_src_template));
175 gst_element_class_add_pad_template (element_class,
176 gst_static_pad_template_get (&gst_rtp_dtmf_depay_sink_template));
179 GST_DEBUG_CATEGORY_INIT (gst_rtp_dtmf_depay_debug,
180 "rtpdtmfdepay", 0, "rtpdtmfdepay element");
181 gst_element_class_set_details (element_class, &gst_rtp_dtmfdepay_details);
185 gst_rtp_dtmf_depay_class_init (GstRtpDTMFDepayClass * klass)
187 GObjectClass *gobject_class;
188 GstElementClass *gstelement_class;
189 GstBaseRTPDepayloadClass *gstbasertpdepayload_class;
191 gobject_class = (GObjectClass *) klass;
192 gstelement_class = (GstElementClass *) klass;
193 gstbasertpdepayload_class = (GstBaseRTPDepayloadClass *) klass;
195 parent_class = g_type_class_peek_parent (klass);
197 gobject_class->set_property =
198 GST_DEBUG_FUNCPTR (gst_rtp_dtmf_depay_set_property);
199 gobject_class->get_property =
200 GST_DEBUG_FUNCPTR (gst_rtp_dtmf_depay_get_property);
202 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_UNIT_TIME,
203 g_param_spec_uint ("unit-time", "Duration unittime",
204 "The smallest unit (ms) the duration must be a multiple of (0 disables it)", MIN_UNIT_TIME,
205 MAX_UNIT_TIME, DEFAULT_UNIT_TIME, G_PARAM_READWRITE));
207 gstbasertpdepayload_class->process =
208 GST_DEBUG_FUNCPTR (gst_rtp_dtmf_depay_process);
209 gstbasertpdepayload_class->set_caps =
210 GST_DEBUG_FUNCPTR (gst_rtp_dtmf_depay_setcaps);
215 gst_rtp_dtmf_depay_init (GstRtpDTMFDepay * rtpdtmfdepay,
216 GstRtpDTMFDepayClass * klass)
218 rtpdtmfdepay->unit_time = DEFAULT_UNIT_TIME;
222 gst_rtp_dtmf_depay_set_property (GObject * object, guint prop_id,
223 const GValue * value, GParamSpec * pspec)
225 GstRtpDTMFDepay * rtpdtmfdepay;
227 rtpdtmfdepay = GST_RTP_DTMF_DEPAY (object);
231 rtpdtmfdepay->unit_time = g_value_get_uint (value);
234 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
240 gst_rtp_dtmf_depay_get_property (GObject * object, guint prop_id,
241 GValue * value, GParamSpec * pspec)
243 GstRtpDTMFDepay * rtpdtmfdepay;
245 rtpdtmfdepay = GST_RTP_DTMF_DEPAY (object);
249 g_value_set_uint (value, rtpdtmfdepay->unit_time);
252 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
258 gst_rtp_dtmf_depay_setcaps (GstBaseRTPDepayload * filter, GstCaps * caps)
261 GstStructure *structure = gst_caps_get_structure (caps, 0);
262 gint clock_rate = 8000; /* default */
264 gst_structure_get_int (structure, "clock-rate", &clock_rate);
265 filter->clock_rate = clock_rate;
267 srccaps = gst_caps_new_simple ("audio/x-raw-int",
268 "width", G_TYPE_INT, 16,
269 "depth", G_TYPE_INT, 16,
270 "endianness", G_TYPE_INT, G_BYTE_ORDER,
271 "signed", G_TYPE_BOOLEAN, TRUE,
272 "channels", G_TYPE_INT, 1,
273 "rate", G_TYPE_INT, clock_rate, NULL);
274 gst_pad_set_caps (GST_BASE_RTP_DEPAYLOAD_SRCPAD (filter), srccaps);
275 gst_caps_unref (srccaps);
281 gst_dtmf_src_generate_tone(GstRtpDTMFDepay *rtpdtmfdepay,
282 GstRTPDTMFPayload payload, GstBuffer * buffer)
287 double amplitude, f1, f2;
288 double volume_factor;
289 DTMF_KEY key = DTMF_KEYS[payload.event];
290 guint32 clock_rate = 8000 /* default */;
291 GstBaseRTPDepayload * depayload = GST_BASE_RTP_DEPAYLOAD (rtpdtmfdepay);
294 clock_rate = depayload->clock_rate;
296 /* Create a buffer for the tone */
297 tone_size = (payload.duration*SAMPLE_SIZE*CHANNELS)/8;
298 GST_BUFFER_SIZE (buffer) = tone_size;
299 GST_BUFFER_MALLOCDATA (buffer) = g_malloc(tone_size);
300 GST_BUFFER_DATA (buffer) = GST_BUFFER_MALLOCDATA (buffer);
301 GST_BUFFER_DURATION (buffer) = payload.duration * GST_SECOND / clock_rate;
302 volume = payload.volume;
304 p = (gint16 *) GST_BUFFER_MALLOCDATA (buffer);
306 volume_factor = pow (10, (-volume) / 20);
309 * For each sample point we calculate 'x' as the
310 * the amplitude value.
312 for (i = 0; i < (tone_size / (SAMPLE_SIZE/8)); i++) {
314 * We add the fundamental frequencies together.
316 f1 = sin(2 * M_PI * key.low_frequency * (rtpdtmfdepay->sample / clock_rate));
317 f2 = sin(2 * M_PI * key.high_frequency * (rtpdtmfdepay->sample / clock_rate));
319 amplitude = (f1 + f2) / 2;
321 /* Adjust the volume */
322 amplitude *= volume_factor;
324 /* Make the [-1:1] interval into a [-32767:32767] interval */
327 /* Store it in the data buffer */
328 *(p++) = (gint16) amplitude;
330 (rtpdtmfdepay->sample)++;
336 gst_rtp_dtmf_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
339 GstRtpDTMFDepay *rtpdtmfdepay = NULL;
340 GstBuffer *outbuf = NULL;
342 guint8 *payload = NULL;
344 GstRTPDTMFPayload dtmf_payload;
346 GstStructure *structure = NULL;
347 GstMessage *dtmf_message = NULL;
349 rtpdtmfdepay = GST_RTP_DTMF_DEPAY (depayload);
351 if (!gst_rtp_buffer_validate (buf))
354 payload_len = gst_rtp_buffer_get_payload_len (buf);
355 payload = gst_rtp_buffer_get_payload (buf);
357 if (payload_len != sizeof(GstRTPDTMFPayload) )
360 memcpy (&dtmf_payload, payload, sizeof (GstRTPDTMFPayload));
362 if (dtmf_payload.event > MAX_EVENT)
366 marker = gst_rtp_buffer_get_marker (buf);
368 timestamp = gst_rtp_buffer_get_timestamp (buf);
370 dtmf_payload.duration = g_ntohs (dtmf_payload.duration);
372 /* clip to whole units of unit_time */
373 if (rtpdtmfdepay->unit_time)
374 dtmf_payload.duration -= dtmf_payload.duration %
375 ((rtpdtmfdepay->unit_time * depayload->clock_rate) / 1000);
377 GST_DEBUG_OBJECT (depayload, "Received new RTP DTMF packet : "
378 "marker=%d - timestamp=%u - event=%d - duration=%d",
379 marker, timestamp, dtmf_payload.event, dtmf_payload.duration);
381 GST_DEBUG_OBJECT (depayload, "Previous information : timestamp=%u - duration=%d",
382 rtpdtmfdepay->previous_ts, rtpdtmfdepay->previous_duration);
385 if (marker || rtpdtmfdepay->previous_ts != timestamp) {
386 rtpdtmfdepay->sample = 0;
387 rtpdtmfdepay->previous_ts = timestamp;
388 rtpdtmfdepay->previous_duration = dtmf_payload.duration;
389 rtpdtmfdepay->first_gst_ts = GST_BUFFER_TIMESTAMP (buf);
391 structure = gst_structure_new ("dtmf-event",
392 "number", G_TYPE_INT, dtmf_payload.event,
393 "volume", G_TYPE_INT, dtmf_payload.volume,
394 "type", G_TYPE_INT, 1,
395 "method", G_TYPE_INT, 1,
398 dtmf_message = gst_message_new_element (GST_OBJECT (depayload), structure);
400 if (!gst_element_post_message (GST_ELEMENT (depayload), dtmf_message)) {
401 GST_ERROR_OBJECT (depayload, "Unable to send dtmf-event message to bus");
404 GST_ERROR_OBJECT (depayload, "Unable to create dtmf-event message");
407 GST_ERROR_OBJECT (depayload, "Unable to create dtmf-event structure");
410 guint16 duration = dtmf_payload.duration;
411 dtmf_payload.duration -= rtpdtmfdepay->previous_duration;
412 /* If late buffer, ignore */
413 if (duration > rtpdtmfdepay->previous_duration)
414 rtpdtmfdepay->previous_duration = duration;
417 GST_DEBUG_OBJECT (depayload, "new previous duration : %d - new duration : %d"
418 " - diff : %d - clock rate : %d - timestamp : %llu",
419 rtpdtmfdepay->previous_duration, dtmf_payload.duration,
420 (rtpdtmfdepay->previous_duration - dtmf_payload.duration),
421 depayload->clock_rate, GST_BUFFER_TIMESTAMP (buf));
423 /* If late or duplicate packet (like the redundant end packet). Ignore */
424 if (dtmf_payload.duration > 0) {
425 outbuf = gst_buffer_new ();
426 gst_dtmf_src_generate_tone(rtpdtmfdepay, dtmf_payload, outbuf);
429 GST_BUFFER_TIMESTAMP (outbuf) = rtpdtmfdepay->first_gst_ts +
430 (rtpdtmfdepay->previous_duration - dtmf_payload.duration) *
431 GST_SECOND / depayload->clock_rate;
432 GST_BUFFER_OFFSET (outbuf) =
433 (rtpdtmfdepay->previous_duration - dtmf_payload.duration) *
434 GST_SECOND / depayload->clock_rate;
435 GST_BUFFER_OFFSET_END (outbuf) = rtpdtmfdepay->previous_duration *
436 GST_SECOND / depayload->clock_rate;
438 GST_DEBUG_OBJECT (depayload, "timestamp : %llu - time %" GST_TIME_FORMAT,
439 GST_BUFFER_TIMESTAMP (buf), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
447 GST_ELEMENT_WARNING (rtpdtmfdepay, STREAM, DECODE,
448 ("Packet did not validate"), (NULL));
453 gst_rtp_dtmf_depay_plugin_init (GstPlugin * plugin)
455 return gst_element_register (plugin, "rtpdtmfdepay",
456 GST_RANK_MARGINAL, GST_TYPE_RTP_DTMF_DEPAY);