1 /* GStreamer DTMF source
5 * Copyright (C) <2007> Collabora.
6 * Contact: Youness Alaoui <youness.alaoui@collabora.co.uk>
7 * Copyright (C) <2007> Nokia Corporation.
8 * Contact: Zeeshan Ali <zeeshan.ali@nokia.com>
9 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
10 * 2000,2005 Wim Taymans <wim@fluendo.com>
12 * This library is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU Library General Public
14 * License as published by the Free Software Foundation; either
15 * version 2 of the License, or (at your option) any later version.
17 * This library is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * Library General Public License for more details.
22 * You should have received a copy of the GNU Library General Public
23 * License along with this library; if not, write to the
24 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
25 * Boston, MA 02111-1307, USA.
29 * SECTION:element-dtmfsrc
30 * @short_description: Generates DTMF packets
35 * The DTMFSrc element generates DTMF (ITU-T Q.23 Specification) tone packets on request
36 * from application. The application communicates the beginning and end of a
37 * DTMF event using custom upstream gstreamer events. To report a DTMF event, an
38 * application must send an event of type GST_EVENT_CUSTOM_UPSTREAM, having a
39 * structure of name "dtmf-event" with fields set according to the following
46 * <colspec colname='Name' />
47 * <colspec colname='Type' />
48 * <colspec colname='Possible values' />
49 * <colspec colname='Purpose' />
54 * <entry>GType</entry>
55 * <entry>Possible values</entry>
56 * <entry>Purpose</entry>
63 * <entry>G_TYPE_INT</entry>
65 * <entry>The application uses this field to specify which of the two methods
66 * specified in RFC 2833 to use. The value should be 0 for tones and 1 for
67 * named events. This element is only capable of generating named events.
71 * <entry>number</entry>
72 * <entry>G_TYPE_INT</entry>
74 * <entry>The event number.</entry>
77 * <entry>volume</entry>
78 * <entry>G_TYPE_INT</entry>
80 * <entry>This field describes the power level of the tone, expressed in dBm0
81 * after dropping the sign. Power levels range from 0 to -63 dBm0. The range of
82 * valid DTMF is from 0 to -36 dBm0. Can be omitted if start is set to FALSE.
86 * <entry>start</entry>
87 * <entry>G_TYPE_BOOLEAN</entry>
88 * <entry>True or False</entry>
89 * <entry>Whether the event is starting or ending.</entry>
92 * <entry>method</entry>
93 * <entry>G_TYPE_INT</entry>
95 * <entry>The method used for sending event, this element will react if this
96 * field is absent or 2.
104 * <para>For example, the following code informs the pipeline (and in turn, the
105 * DTMFSrc element inside the pipeline) about the start of a DTMF named
106 * event '1' of volume -25 dBm0:
111 * structure = gst_structure_new ("dtmf-event",
112 * "type", G_TYPE_INT, 1,
113 * "number", G_TYPE_INT, 1,
114 * "volume", G_TYPE_INT, 25,
115 * "start", G_TYPE_BOOLEAN, TRUE, NULL);
117 * event = gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM, structure);
118 * gst_element_send_event (pipeline, event);
136 # define M_PI 3.14159265358979323846 /* pi */
140 #include "gstdtmfsrc.h"
142 #define GST_TONE_DTMF_TYPE_EVENT 1
143 #define DEFAULT_PACKET_INTERVAL 50 /* ms */
144 #define MIN_PACKET_INTERVAL 10 /* ms */
145 #define MAX_PACKET_INTERVAL 50 /* ms */
146 #define DEFAULT_SAMPLE_RATE 8000
147 #define SAMPLE_SIZE 16
152 #define MAX_VOLUME 36
153 #define MIN_INTER_DIGIT_INTERVAL 100
154 #define MIN_PULSE_DURATION 250
155 #define MIN_DUTY_CYCLE (MIN_INTER_DIGIT_INTERVAL + MIN_PULSE_DURATION)
158 typedef struct st_dtmf_key {
162 float high_frequency;
165 static const DTMF_KEY DTMF_KEYS[] = {
166 {"DTMF_KEY_EVENT_0", 0, 941, 1336},
167 {"DTMF_KEY_EVENT_1", 1, 697, 1209},
168 {"DTMF_KEY_EVENT_2", 2, 697, 1336},
169 {"DTMF_KEY_EVENT_3", 3, 697, 1477},
170 {"DTMF_KEY_EVENT_4", 4, 770, 1209},
171 {"DTMF_KEY_EVENT_5", 5, 770, 1336},
172 {"DTMF_KEY_EVENT_6", 6, 770, 1477},
173 {"DTMF_KEY_EVENT_7", 7, 852, 1209},
174 {"DTMF_KEY_EVENT_8", 8, 852, 1336},
175 {"DTMF_KEY_EVENT_9", 9, 852, 1477},
176 {"DTMF_KEY_EVENT_S", 10, 941, 1209},
177 {"DTMF_KEY_EVENT_P", 11, 941, 1477},
178 {"DTMF_KEY_EVENT_A", 12, 697, 1633},
179 {"DTMF_KEY_EVENT_B", 13, 770, 1633},
180 {"DTMF_KEY_EVENT_C", 14, 852, 1633},
181 {"DTMF_KEY_EVENT_D", 15, 941, 1633},
184 #define MAX_DTMF_EVENTS 16
187 DTMF_KEY_EVENT_1 = 1,
188 DTMF_KEY_EVENT_2 = 2,
189 DTMF_KEY_EVENT_3 = 3,
190 DTMF_KEY_EVENT_4 = 4,
191 DTMF_KEY_EVENT_5 = 5,
192 DTMF_KEY_EVENT_6 = 6,
193 DTMF_KEY_EVENT_7 = 7,
194 DTMF_KEY_EVENT_8 = 8,
195 DTMF_KEY_EVENT_9 = 9,
196 DTMF_KEY_EVENT_0 = 0,
197 DTMF_KEY_EVENT_STAR = 10,
198 DTMF_KEY_EVENT_POUND = 11,
199 DTMF_KEY_EVENT_A = 12,
200 DTMF_KEY_EVENT_B = 13,
201 DTMF_KEY_EVENT_C = 14,
202 DTMF_KEY_EVENT_D = 15,
205 /* elementfactory information */
206 static const GstElementDetails gst_dtmf_src_details =
207 GST_ELEMENT_DETAILS ("DTMF tone generator",
209 "Generates DTMF tones",
210 "Youness Alaoui <youness.alaoui@collabora.co.uk>");
212 GST_DEBUG_CATEGORY_STATIC (gst_dtmf_src_debug);
213 #define GST_CAT_DEFAULT gst_dtmf_src_debug
221 static GstStaticPadTemplate gst_dtmf_src_template =
222 GST_STATIC_PAD_TEMPLATE ("src",
225 GST_STATIC_CAPS ("audio/x-raw-int, "
228 "endianness = (int) " G_STRINGIFY (G_BYTE_ORDER) ", "
229 "signed = (bool) true, "
230 "rate = (int) 8000, "
231 "channels = (int) 1")
234 GST_BOILERPLATE (GstDTMFSrc, gst_dtmf_src, GstBaseSrc, GST_TYPE_BASE_SRC);
236 static void gst_dtmf_src_finalize (GObject * object);
238 static void gst_dtmf_src_set_property (GObject * object, guint prop_id,
239 const GValue * value, GParamSpec * pspec);
240 static void gst_dtmf_src_get_property (GObject * object, guint prop_id,
241 GValue * value, GParamSpec * pspec);
242 static gboolean gst_dtmf_src_handle_event (GstBaseSrc *src, GstEvent * event);
243 static GstStateChangeReturn gst_dtmf_src_change_state (GstElement * element,
244 GstStateChange transition);
245 static GstFlowReturn gst_dtmf_src_create (GstBaseSrc * basesrc,
246 guint64 offset, guint length, GstBuffer ** buffer);
247 static void gst_dtmf_src_add_start_event (GstDTMFSrc *dtmfsrc,
248 gint event_number, gint event_volume);
249 static void gst_dtmf_src_add_stop_event (GstDTMFSrc *dtmfsrc);
251 static gboolean gst_dtmf_src_unlock (GstBaseSrc *src);
253 static gboolean gst_dtmf_src_unlock_stop (GstBaseSrc *src);
256 gst_dtmf_src_base_init (gpointer g_class)
258 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
260 GST_DEBUG_CATEGORY_INIT (gst_dtmf_src_debug,
261 "dtmfsrc", 0, "dtmfsrc element");
263 gst_element_class_add_pad_template (element_class,
264 gst_static_pad_template_get (&gst_dtmf_src_template));
266 gst_element_class_set_details (element_class, &gst_dtmf_src_details);
270 gst_dtmf_src_class_init (GstDTMFSrcClass * klass)
272 GObjectClass *gobject_class;
273 GstBaseSrcClass *gstbasesrc_class;
274 GstElementClass *gstelement_class;
276 gobject_class = G_OBJECT_CLASS (klass);
277 gstbasesrc_class = GST_BASE_SRC_CLASS (klass);
278 gstelement_class = GST_ELEMENT_CLASS (klass);
281 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_dtmf_src_finalize);
282 gobject_class->set_property =
283 GST_DEBUG_FUNCPTR (gst_dtmf_src_set_property);
284 gobject_class->get_property =
285 GST_DEBUG_FUNCPTR (gst_dtmf_src_get_property);
287 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_INTERVAL,
288 g_param_spec_uint ("interval", "Interval between tone packets",
289 "Interval in ms between two tone packets", MIN_PACKET_INTERVAL,
290 MAX_PACKET_INTERVAL, DEFAULT_PACKET_INTERVAL, G_PARAM_READWRITE));
292 gstelement_class->change_state =
293 GST_DEBUG_FUNCPTR (gst_dtmf_src_change_state);
294 gstbasesrc_class->unlock =
295 GST_DEBUG_FUNCPTR (gst_dtmf_src_unlock);
296 gstbasesrc_class->unlock_stop =
297 GST_DEBUG_FUNCPTR (gst_dtmf_src_unlock_stop);
299 gstbasesrc_class->event =
300 GST_DEBUG_FUNCPTR (gst_dtmf_src_handle_event);
301 gstbasesrc_class->create =
302 GST_DEBUG_FUNCPTR (gst_dtmf_src_create);
308 gst_dtmf_src_init (GstDTMFSrc * dtmfsrc, GstDTMFSrcClass *g_class)
310 /* we operate in time */
311 gst_base_src_set_format (GST_BASE_SRC (dtmfsrc), GST_FORMAT_TIME);
312 gst_base_src_set_live (GST_BASE_SRC (dtmfsrc), TRUE);
314 dtmfsrc->interval = DEFAULT_PACKET_INTERVAL;
316 dtmfsrc->event_queue = g_async_queue_new ();
317 dtmfsrc->last_event = NULL;
319 dtmfsrc->sample_rate = DEFAULT_SAMPLE_RATE;
321 GST_DEBUG_OBJECT (dtmfsrc, "init done");
325 gst_dtmf_src_finalize (GObject * object)
329 dtmfsrc = GST_DTMF_SRC (object);
331 if (dtmfsrc->event_queue) {
332 g_async_queue_unref (dtmfsrc->event_queue);
333 dtmfsrc->event_queue = NULL;
336 G_OBJECT_CLASS (parent_class)->finalize (object);
340 gst_dtmf_src_handle_dtmf_event (GstDTMFSrc *dtmfsrc,
341 const GstStructure * event_structure)
347 if (!gst_structure_get_int (event_structure, "type", &event_type) ||
348 !gst_structure_get_boolean (event_structure, "start", &start) ||
349 (start == TRUE && event_type != GST_TONE_DTMF_TYPE_EVENT))
352 if (gst_structure_get_int (event_structure, "method", &method)) {
362 if (!gst_structure_get_int (event_structure, "number", &event_number) ||
363 !gst_structure_get_int (event_structure, "volume", &event_volume))
366 GST_DEBUG_OBJECT (dtmfsrc, "Received start event %d with volume %d",
367 event_number, event_volume);
368 gst_dtmf_src_add_start_event (dtmfsrc, event_number, event_volume);
372 GST_DEBUG_OBJECT (dtmfsrc, "Received stop event");
373 gst_dtmf_src_add_stop_event (dtmfsrc);
382 gst_dtmf_src_handle_custom_upstream (GstDTMFSrc *dtmfsrc,
385 gboolean result = FALSE;
386 const GstStructure *structure;
388 GstStateChangeReturn ret;
390 ret = gst_element_get_state (GST_ELEMENT (dtmfsrc), &state, NULL, 0);
391 if (ret != GST_STATE_CHANGE_SUCCESS || state != GST_STATE_PLAYING) {
392 GST_DEBUG_OBJECT (dtmfsrc, "Received event while not in PLAYING state");
396 GST_DEBUG_OBJECT (dtmfsrc, "Received event is of our interest");
397 structure = gst_event_get_structure (event);
398 if (structure && gst_structure_has_name (structure, "dtmf-event"))
399 result = gst_dtmf_src_handle_dtmf_event (dtmfsrc, structure);
406 gst_dtmf_src_handle_event (GstBaseSrc * src, GstEvent * event)
409 gboolean result = FALSE;
411 dtmfsrc = GST_DTMF_SRC (src);
413 GST_DEBUG_OBJECT (dtmfsrc, "Received an event on the src pad");
414 if (GST_EVENT_TYPE (event) == GST_EVENT_CUSTOM_UPSTREAM) {
415 result = gst_dtmf_src_handle_custom_upstream (dtmfsrc, event);
422 gst_dtmf_src_set_property (GObject * object, guint prop_id,
423 const GValue * value, GParamSpec * pspec)
427 dtmfsrc = GST_DTMF_SRC (object);
431 dtmfsrc->interval = g_value_get_uint (value);
434 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
440 gst_dtmf_src_get_property (GObject * object, guint prop_id, GValue * value,
445 dtmfsrc = GST_DTMF_SRC (object);
449 g_value_set_uint (value, dtmfsrc->interval);
452 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
458 gst_dtmf_src_set_stream_lock (GstDTMFSrc *dtmfsrc, gboolean lock)
460 GstPad *srcpad = GST_BASE_SRC_PAD (dtmfsrc);
462 GstStructure *structure;
464 structure = gst_structure_new ("stream-lock",
465 "lock", G_TYPE_BOOLEAN, lock, NULL);
467 event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM_OOB, structure);
468 if (!gst_pad_push_event (srcpad, event)) {
469 GST_WARNING_OBJECT (dtmfsrc, "stream-lock event not handled");
474 gst_dtmf_prepare_timestamps (GstDTMFSrc *dtmfsrc)
477 GstClockTime base_time;
479 base_time = gst_element_get_base_time (GST_ELEMENT (dtmfsrc));
481 clock = gst_element_get_clock (GST_ELEMENT (dtmfsrc));
484 dtmfsrc->timestamp = gst_clock_get_time (clock);
486 dtmfsrc->timestamp = gst_clock_get_time (clock) - base_time;
488 gst_object_unref (clock);
490 gchar *dtmf_name = gst_element_get_name (dtmfsrc);
491 GST_ERROR_OBJECT (dtmfsrc, "No clock set for element %s", dtmf_name);
492 dtmfsrc->timestamp = GST_CLOCK_TIME_NONE;
498 gst_dtmf_src_add_start_event (GstDTMFSrc *dtmfsrc, gint event_number,
502 GstDTMFSrcEvent * event = g_malloc (sizeof(GstDTMFSrcEvent));
503 event->event_type = DTMF_EVENT_TYPE_START;
505 event->event_number = CLAMP (event_number, MIN_EVENT, MAX_EVENT);
506 event->volume = CLAMP (event_volume, MIN_VOLUME, MAX_VOLUME);
508 g_async_queue_push (dtmfsrc->event_queue, event);
512 gst_dtmf_src_add_stop_event (GstDTMFSrc *dtmfsrc)
515 GstDTMFSrcEvent * event = g_malloc (sizeof(GstDTMFSrcEvent));
516 event->event_type = DTMF_EVENT_TYPE_STOP;
518 event->event_number = 0;
521 g_async_queue_push (dtmfsrc->event_queue, event);
525 gst_dtmf_src_generate_silence(GstBuffer * buffer, float duration,
530 /* Create a buffer with data set to 0 */
531 buf_size = ((duration/1000)*sample_rate*SAMPLE_SIZE*CHANNELS)/8;
532 GST_BUFFER_SIZE (buffer) = buf_size;
533 GST_BUFFER_MALLOCDATA (buffer) = g_malloc0(buf_size);
534 GST_BUFFER_DATA (buffer) = GST_BUFFER_MALLOCDATA (buffer);
539 gst_dtmf_src_generate_tone(GstDTMFSrcEvent *event, DTMF_KEY key, float duration,
540 GstBuffer * buffer, gint sample_rate)
545 double amplitude, f1, f2;
546 double volume_factor;
548 /* Create a buffer for the tone */
549 tone_size = ((duration/1000)*sample_rate*SAMPLE_SIZE*CHANNELS)/8;
550 GST_BUFFER_SIZE (buffer) = tone_size;
551 GST_BUFFER_MALLOCDATA (buffer) = g_malloc(tone_size);
552 GST_BUFFER_DATA (buffer) = GST_BUFFER_MALLOCDATA (buffer);
554 p = (gint16 *) GST_BUFFER_MALLOCDATA (buffer);
556 volume_factor = pow (10, (-event->volume) / 20);
559 * For each sample point we calculate 'x' as the
560 * the amplitude value.
562 for (i = 0; i < (tone_size / (SAMPLE_SIZE/8)); i++) {
564 * We add the fundamental frequencies together.
566 f1 = sin(2 * M_PI * key.low_frequency * (event->sample / sample_rate));
567 f2 = sin(2 * M_PI * key.high_frequency * (event->sample / sample_rate));
569 amplitude = (f1 + f2) / 2;
571 /* Adjust the volume */
572 amplitude *= volume_factor;
574 /* Make the [-1:1] interval into a [-32767:32767] interval */
577 /* Store it in the data buffer */
578 *(p++) = (gint16) amplitude;
587 gst_dtmf_src_create_next_tone_packet (GstDTMFSrc *dtmfsrc,
588 GstDTMFSrcEvent *event)
590 GstBuffer *buf = NULL;
591 gboolean send_silence = FALSE;
592 GstPad *srcpad = GST_BASE_SRC_PAD (dtmfsrc);
594 GST_DEBUG_OBJECT (dtmfsrc, "Creating buffer for tone %s",
595 DTMF_KEYS[event->event_number].event_name);
597 /* create buffer to hold the tone */
598 buf = gst_buffer_new ();
600 if (event->packet_count * dtmfsrc->interval < MIN_INTER_DIGIT_INTERVAL) {
605 GST_DEBUG_OBJECT (dtmfsrc, "Generating silence");
606 gst_dtmf_src_generate_silence (buf, dtmfsrc->interval,
607 dtmfsrc->sample_rate);
609 GST_DEBUG_OBJECT (dtmfsrc, "Generating tone");
610 gst_dtmf_src_generate_tone(event, DTMF_KEYS[event->event_number],
611 dtmfsrc->interval, buf, dtmfsrc->sample_rate);
613 event->packet_count++;
616 /* timestamp and duration of GstBuffer */
617 GST_BUFFER_DURATION (buf) = dtmfsrc->interval * GST_MSECOND;
618 GST_BUFFER_TIMESTAMP (buf) = dtmfsrc->timestamp;
619 dtmfsrc->timestamp += GST_BUFFER_DURATION (buf);
621 /* Set caps on the buffer before pushing it */
622 gst_buffer_set_caps (buf, GST_PAD_CAPS (srcpad));
628 gst_dtmf_src_create (GstBaseSrc * basesrc, guint64 offset,
629 guint length, GstBuffer ** buffer)
631 GstBuffer *buf = NULL;
632 GstDTMFSrcEvent *event;
633 GstDTMFSrc * dtmfsrc;
636 GstClockReturn clockret;
638 dtmfsrc = GST_DTMF_SRC (basesrc);
642 if (dtmfsrc->last_event == NULL) {
643 GST_DEBUG_OBJECT (dtmfsrc, "popping");
644 event = g_async_queue_pop (dtmfsrc->event_queue);
646 GST_DEBUG_OBJECT (dtmfsrc, "popped %d", event->event_type);
648 switch (event->event_type) {
649 case DTMF_EVENT_TYPE_STOP:
650 GST_WARNING_OBJECT (dtmfsrc,
651 "Received a DTMF stop event when already stopped");
653 case DTMF_EVENT_TYPE_START:
654 gst_dtmf_prepare_timestamps (dtmfsrc);
656 /* Don't forget to get exclusive access to the stream */
657 gst_dtmf_src_set_stream_lock (dtmfsrc, TRUE);
659 event->packet_count = 0;
660 dtmfsrc->last_event = event;
663 case DTMF_EVENT_TYPE_PAUSE_TASK:
665 * We're pushing it back because it has to stay in there until
666 * the task is really paused (and the queue will then be flushed)
668 GST_DEBUG_OBJECT (dtmfsrc, "pushing pause_task...");
669 GST_OBJECT_LOCK (dtmfsrc);
670 if (dtmfsrc->paused) {
671 g_async_queue_push (dtmfsrc->event_queue, event);
674 GST_OBJECT_UNLOCK (dtmfsrc);
679 } else if (dtmfsrc->last_event->packet_count * dtmfsrc->interval >=
681 event = g_async_queue_try_pop (dtmfsrc->event_queue);
685 switch (event->event_type) {
686 case DTMF_EVENT_TYPE_START:
687 GST_WARNING_OBJECT (dtmfsrc,
688 "Received two consecutive DTMF start events");
690 case DTMF_EVENT_TYPE_STOP:
691 gst_dtmf_src_set_stream_lock (dtmfsrc, FALSE);
693 g_free (dtmfsrc->last_event);
694 dtmfsrc->last_event = NULL;
696 case DTMF_EVENT_TYPE_PAUSE_TASK:
698 * We're pushing it back because it has to stay in there until
699 * the task is really paused (and the queue will then be flushed)
701 GST_DEBUG_OBJECT (dtmfsrc, "pushing pause_task...");
703 GST_OBJECT_LOCK (dtmfsrc);
704 if (dtmfsrc->paused) {
705 g_async_queue_push (dtmfsrc->event_queue, event);
708 GST_OBJECT_UNLOCK (dtmfsrc);
715 } while (dtmfsrc->last_event == NULL);
717 GST_DEBUG_OBJECT (dtmfsrc, "end event check, now wait for the proper time");
719 clock = gst_element_get_clock (GST_ELEMENT (basesrc));
722 clockid = gst_clock_new_single_shot_id (clock, dtmfsrc->timestamp);
724 clockid = gst_clock_new_single_shot_id (clock, dtmfsrc->timestamp +
725 gst_element_get_base_time (GST_ELEMENT (dtmfsrc)));
727 gst_object_unref (clock);
729 GST_OBJECT_LOCK (dtmfsrc);
730 if (!dtmfsrc->paused) {
731 dtmfsrc->clockid = clockid;
732 GST_OBJECT_UNLOCK (dtmfsrc);
734 clockret = gst_clock_id_wait (clockid, NULL);
736 GST_OBJECT_LOCK (dtmfsrc);
738 clockret = GST_CLOCK_UNSCHEDULED;
740 clockret = GST_CLOCK_UNSCHEDULED;
742 gst_clock_id_unref (clockid);
743 dtmfsrc->clockid = NULL;
744 GST_OBJECT_UNLOCK (dtmfsrc);
746 if (clockret == GST_CLOCK_UNSCHEDULED) {
750 buf = gst_dtmf_src_create_next_tone_packet (dtmfsrc, dtmfsrc->last_event);
752 GST_DEBUG_OBJECT (dtmfsrc, "Created buffer of size %d", GST_BUFFER_SIZE (buf));
755 GST_DEBUG_OBJECT (dtmfsrc, "returning a buffer");
759 GST_OBJECT_UNLOCK (dtmfsrc);
763 if (dtmfsrc->last_event) {
764 GST_DEBUG_OBJECT (dtmfsrc, "Stopping current event");
765 /* Don't forget to release the stream lock */
766 gst_dtmf_src_set_stream_lock (dtmfsrc, FALSE);
767 g_free (dtmfsrc->last_event);
768 dtmfsrc->last_event = NULL;
771 return GST_FLOW_WRONG_STATE;
776 gst_dtmf_src_unlock (GstBaseSrc *src) {
777 GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (src);
778 GstDTMFSrcEvent *event = NULL;
780 GST_DEBUG_OBJECT (dtmfsrc, "Called unlock");
782 GST_OBJECT_LOCK (dtmfsrc);
783 dtmfsrc->paused = TRUE;
784 if (dtmfsrc->clockid) {
785 gst_clock_id_unschedule (dtmfsrc->clockid);
787 GST_OBJECT_UNLOCK (dtmfsrc);
789 GST_DEBUG_OBJECT (dtmfsrc, "Pushing the PAUSE_TASK event on unlock request");
790 event = g_malloc (sizeof(GstDTMFSrcEvent));
791 event->event_type = DTMF_EVENT_TYPE_PAUSE_TASK;
792 g_async_queue_push (dtmfsrc->event_queue, event);
799 gst_dtmf_src_unlock_stop (GstBaseSrc *src) {
800 GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (src);
802 GST_DEBUG_OBJECT (dtmfsrc, "Unlock stopped");
804 GST_OBJECT_LOCK (dtmfsrc);
805 dtmfsrc->paused = FALSE;
806 GST_OBJECT_UNLOCK (dtmfsrc);
812 static GstStateChangeReturn
813 gst_dtmf_src_change_state (GstElement * element, GstStateChange transition)
816 GstStateChangeReturn result;
817 gboolean no_preroll = FALSE;
818 GstDTMFSrcEvent *event = NULL;
820 dtmfsrc = GST_DTMF_SRC (element);
822 switch (transition) {
823 case GST_STATE_CHANGE_READY_TO_PAUSED:
824 /* Flushing the event queue */
825 event = g_async_queue_try_pop (dtmfsrc->event_queue);
827 while (event != NULL) {
829 event = g_async_queue_try_pop (dtmfsrc->event_queue);
838 GST_ELEMENT_CLASS (parent_class)->change_state (element,
839 transition)) == GST_STATE_CHANGE_FAILURE)
842 switch (transition) {
843 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
846 case GST_STATE_CHANGE_PAUSED_TO_READY:
847 GST_DEBUG_OBJECT (dtmfsrc, "Flushing event queue");
848 /* Flushing the event queue */
849 event = g_async_queue_try_pop (dtmfsrc->event_queue);
851 while (event != NULL) {
853 event = g_async_queue_try_pop (dtmfsrc->event_queue);
861 if (no_preroll && result == GST_STATE_CHANGE_SUCCESS)
862 result = GST_STATE_CHANGE_NO_PREROLL;
869 GST_ERROR_OBJECT (dtmfsrc, "parent failed state change");
875 gst_dtmf_src_plugin_init (GstPlugin * plugin)
877 return gst_element_register (plugin, "dtmfsrc",
878 GST_RANK_NONE, GST_TYPE_DTMF_SRC);