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 * @see_also: rtpdtmsrc, rtpdtmfmuxx
32 * The DTMFSrc element generates DTMF (ITU-T Q.23 Specification) tone packets on request
33 * from application. The application communicates the beginning and end of a
34 * DTMF event using custom upstream gstreamer events. To report a DTMF event, an
35 * application must send an event of type GST_EVENT_CUSTOM_UPSTREAM, having a
36 * structure of name "dtmf-event" with fields set according to the following
41 * <colspec colname='Name' />
42 * <colspec colname='Type' />
43 * <colspec colname='Possible values' />
44 * <colspec colname='Purpose' />
48 * <entry>GType</entry>
49 * <entry>Possible values</entry>
50 * <entry>Purpose</entry>
56 * <entry>G_TYPE_INT</entry>
58 * <entry>The application uses this field to specify which of the two methods
59 * specified in RFC 2833 to use. The value should be 0 for tones and 1 for
60 * named events. Tones are specified by their frequencies and events are specied
61 * by their number. This element can only take events as input. Do not confuse
62 * with "method" which specified the output.
66 * <entry>number</entry>
67 * <entry>G_TYPE_INT</entry>
69 * <entry>The event number.</entry>
72 * <entry>volume</entry>
73 * <entry>G_TYPE_INT</entry>
75 * <entry>This field describes the power level of the tone, expressed in dBm0
76 * after dropping the sign. Power levels range from 0 to -63 dBm0. The range of
77 * valid DTMF is from 0 to -36 dBm0. Can be omitted if start is set to FALSE.
81 * <entry>start</entry>
82 * <entry>G_TYPE_BOOLEAN</entry>
83 * <entry>True or False</entry>
84 * <entry>Whether the event is starting or ending.</entry>
87 * <entry>method</entry>
88 * <entry>G_TYPE_INT</entry>
90 * <entry>The method used for sending event, this element will react if this
91 * field is absent or 2.
98 * For example, the following code informs the pipeline (and in turn, the
99 * DTMFSrc element inside the pipeline) about the start of a DTMF named
100 * event '1' of volume -25 dBm0:
103 * structure = gst_structure_new ("dtmf-event",
104 * "type", G_TYPE_INT, 1,
105 * "number", G_TYPE_INT, 1,
106 * "volume", G_TYPE_INT, 25,
107 * "start", G_TYPE_BOOLEAN, TRUE, NULL);
109 * event = gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM, structure);
110 * gst_element_send_event (pipeline, event);
113 * When a DTMF tone actually starts or stop, a "dtmf-event-processed"
114 * element #GstMessage with the same fields as the "dtmf-event"
115 * #GstEvent that was used to request the event. Also, if any event
116 * has not been processed when the element goes from the PAUSED to the
117 * READY state, then a "dtmf-event-dropped" message is posted on the
118 * #GstBus in the order that they were received.
131 #include "gstdtmfcommon.h"
133 #include "gstdtmfsrc.h"
135 #include <gst/audio/audio.h>
137 #define GST_TONE_DTMF_TYPE_EVENT 1
138 #define DEFAULT_PACKET_INTERVAL 50 /* ms */
139 #define MIN_PACKET_INTERVAL 10 /* ms */
140 #define MAX_PACKET_INTERVAL 50 /* ms */
141 #define DEFAULT_SAMPLE_RATE 8000
142 #define SAMPLE_SIZE 16
144 #define MIN_DUTY_CYCLE (MIN_INTER_DIGIT_INTERVAL + MIN_PULSE_DURATION)
147 typedef struct st_dtmf_key
149 const char *event_name;
152 float high_frequency;
155 static const DTMF_KEY DTMF_KEYS[] = {
156 {"DTMF_KEY_EVENT_0", 0, 941, 1336},
157 {"DTMF_KEY_EVENT_1", 1, 697, 1209},
158 {"DTMF_KEY_EVENT_2", 2, 697, 1336},
159 {"DTMF_KEY_EVENT_3", 3, 697, 1477},
160 {"DTMF_KEY_EVENT_4", 4, 770, 1209},
161 {"DTMF_KEY_EVENT_5", 5, 770, 1336},
162 {"DTMF_KEY_EVENT_6", 6, 770, 1477},
163 {"DTMF_KEY_EVENT_7", 7, 852, 1209},
164 {"DTMF_KEY_EVENT_8", 8, 852, 1336},
165 {"DTMF_KEY_EVENT_9", 9, 852, 1477},
166 {"DTMF_KEY_EVENT_S", 10, 941, 1209},
167 {"DTMF_KEY_EVENT_P", 11, 941, 1477},
168 {"DTMF_KEY_EVENT_A", 12, 697, 1633},
169 {"DTMF_KEY_EVENT_B", 13, 770, 1633},
170 {"DTMF_KEY_EVENT_C", 14, 852, 1633},
171 {"DTMF_KEY_EVENT_D", 15, 941, 1633},
174 #define MAX_DTMF_EVENTS 16
178 DTMF_KEY_EVENT_1 = 1,
179 DTMF_KEY_EVENT_2 = 2,
180 DTMF_KEY_EVENT_3 = 3,
181 DTMF_KEY_EVENT_4 = 4,
182 DTMF_KEY_EVENT_5 = 5,
183 DTMF_KEY_EVENT_6 = 6,
184 DTMF_KEY_EVENT_7 = 7,
185 DTMF_KEY_EVENT_8 = 8,
186 DTMF_KEY_EVENT_9 = 9,
187 DTMF_KEY_EVENT_0 = 0,
188 DTMF_KEY_EVENT_STAR = 10,
189 DTMF_KEY_EVENT_POUND = 11,
190 DTMF_KEY_EVENT_A = 12,
191 DTMF_KEY_EVENT_B = 13,
192 DTMF_KEY_EVENT_C = 14,
193 DTMF_KEY_EVENT_D = 15,
196 GST_DEBUG_CATEGORY_STATIC (gst_dtmf_src_debug);
197 #define GST_CAT_DEFAULT gst_dtmf_src_debug
205 static GstStaticPadTemplate gst_dtmf_src_template =
206 GST_STATIC_PAD_TEMPLATE ("src",
209 GST_STATIC_CAPS ("audio/x-raw, "
210 "format = (string) \"" GST_AUDIO_NE (S16) "\", "
211 "rate = " GST_AUDIO_RATE_RANGE ", " "channels = (int) 1")
214 #define parent_class gst_dtmf_src_parent_class
215 G_DEFINE_TYPE (GstDTMFSrc, gst_dtmf_src, GST_TYPE_BASE_SRC);
217 static void gst_dtmf_src_finalize (GObject * object);
219 static void gst_dtmf_src_set_property (GObject * object, guint prop_id,
220 const GValue * value, GParamSpec * pspec);
221 static void gst_dtmf_src_get_property (GObject * object, guint prop_id,
222 GValue * value, GParamSpec * pspec);
223 static gboolean gst_dtmf_src_handle_event (GstBaseSrc * src, GstEvent * event);
224 static gboolean gst_dtmf_src_send_event (GstElement * src, GstEvent * event);
225 static GstStateChangeReturn gst_dtmf_src_change_state (GstElement * element,
226 GstStateChange transition);
227 static GstFlowReturn gst_dtmf_src_create (GstBaseSrc * basesrc,
228 guint64 offset, guint length, GstBuffer ** buffer);
229 static void gst_dtmf_src_add_start_event (GstDTMFSrc * dtmfsrc,
230 gint event_number, gint event_volume);
231 static void gst_dtmf_src_add_stop_event (GstDTMFSrc * dtmfsrc);
233 static gboolean gst_dtmf_src_unlock (GstBaseSrc * src);
235 static gboolean gst_dtmf_src_unlock_stop (GstBaseSrc * src);
236 static gboolean gst_dtmf_src_negotiate (GstBaseSrc * basesrc);
240 gst_dtmf_src_class_init (GstDTMFSrcClass * klass)
242 GObjectClass *gobject_class;
243 GstBaseSrcClass *gstbasesrc_class;
244 GstElementClass *gstelement_class;
246 gobject_class = G_OBJECT_CLASS (klass);
247 gstbasesrc_class = GST_BASE_SRC_CLASS (klass);
248 gstelement_class = GST_ELEMENT_CLASS (klass);
251 GST_DEBUG_CATEGORY_INIT (gst_dtmf_src_debug, "dtmfsrc", 0, "dtmfsrc element");
253 gst_element_class_add_pad_template (gstelement_class,
254 gst_static_pad_template_get (&gst_dtmf_src_template));
256 gst_element_class_set_metadata (gstelement_class, "DTMF tone generator",
258 "Generates DTMF tones",
259 "Youness Alaoui <youness.alaoui@collabora.co.uk>");
262 gobject_class->finalize = gst_dtmf_src_finalize;
263 gobject_class->set_property = gst_dtmf_src_set_property;
264 gobject_class->get_property = gst_dtmf_src_get_property;
266 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_INTERVAL,
267 g_param_spec_uint ("interval", "Interval between tone packets",
268 "Interval in ms between two tone packets", MIN_PACKET_INTERVAL,
269 MAX_PACKET_INTERVAL, DEFAULT_PACKET_INTERVAL,
270 G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
272 gstelement_class->change_state =
273 GST_DEBUG_FUNCPTR (gst_dtmf_src_change_state);
274 gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_dtmf_src_send_event);
275 gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_dtmf_src_unlock);
276 gstbasesrc_class->unlock_stop = GST_DEBUG_FUNCPTR (gst_dtmf_src_unlock_stop);
278 gstbasesrc_class->event = GST_DEBUG_FUNCPTR (gst_dtmf_src_handle_event);
279 gstbasesrc_class->create = GST_DEBUG_FUNCPTR (gst_dtmf_src_create);
280 gstbasesrc_class->negotiate = GST_DEBUG_FUNCPTR (gst_dtmf_src_negotiate);
284 event_free (GstDTMFSrcEvent * event)
287 g_slice_free (GstDTMFSrcEvent, event);
291 gst_dtmf_src_init (GstDTMFSrc * dtmfsrc)
293 /* we operate in time */
294 gst_base_src_set_format (GST_BASE_SRC (dtmfsrc), GST_FORMAT_TIME);
295 gst_base_src_set_live (GST_BASE_SRC (dtmfsrc), TRUE);
297 dtmfsrc->interval = DEFAULT_PACKET_INTERVAL;
299 dtmfsrc->event_queue = g_async_queue_new_full ((GDestroyNotify) event_free);
300 dtmfsrc->last_event = NULL;
302 dtmfsrc->sample_rate = DEFAULT_SAMPLE_RATE;
304 GST_DEBUG_OBJECT (dtmfsrc, "init done");
308 gst_dtmf_src_finalize (GObject * object)
312 dtmfsrc = GST_DTMF_SRC (object);
314 if (dtmfsrc->event_queue) {
315 g_async_queue_unref (dtmfsrc->event_queue);
316 dtmfsrc->event_queue = NULL;
319 G_OBJECT_CLASS (gst_dtmf_src_parent_class)->finalize (object);
323 gst_dtmf_src_handle_dtmf_event (GstDTMFSrc * dtmfsrc, GstEvent * event)
325 const GstStructure *event_structure;
326 GstStateChangeReturn sret;
331 GstClockTime last_stop;
334 gboolean correct_order;
336 sret = gst_element_get_state (GST_ELEMENT (dtmfsrc), &state, NULL, 0);
337 if (sret != GST_STATE_CHANGE_SUCCESS || state != GST_STATE_PLAYING) {
338 GST_DEBUG_OBJECT (dtmfsrc, "dtmf-event, but not in PLAYING state");
342 event_structure = gst_event_get_structure (event);
344 if (!gst_structure_get_int (event_structure, "type", &event_type) ||
345 !gst_structure_get_boolean (event_structure, "start", &start) ||
346 (start == TRUE && event_type != GST_TONE_DTMF_TYPE_EVENT))
349 if (gst_structure_get_int (event_structure, "method", &method)) {
356 if (!gst_structure_get_int (event_structure, "number", &event_number) ||
357 !gst_structure_get_int (event_structure, "volume", &event_volume))
361 GST_OBJECT_LOCK (dtmfsrc);
362 if (gst_structure_get_clock_time (event_structure, "last-stop", &last_stop))
363 dtmfsrc->last_stop = last_stop;
365 dtmfsrc->last_stop = GST_CLOCK_TIME_NONE;
366 correct_order = (start != dtmfsrc->last_event_was_start);
367 dtmfsrc->last_event_was_start = start;
368 GST_OBJECT_UNLOCK (dtmfsrc);
374 GST_DEBUG_OBJECT (dtmfsrc, "Received start event %d with volume %d",
375 event_number, event_volume);
376 gst_dtmf_src_add_start_event (dtmfsrc, event_number, event_volume);
380 GST_DEBUG_OBJECT (dtmfsrc, "Received stop event");
381 gst_dtmf_src_add_stop_event (dtmfsrc);
390 gst_dtmf_src_handle_event (GstBaseSrc * src, GstEvent * event)
393 gboolean result = FALSE;
395 dtmfsrc = GST_DTMF_SRC (src);
397 GST_LOG_OBJECT (dtmfsrc, "Received an %s event on the src pad",
398 GST_EVENT_TYPE_NAME (event));
400 switch (GST_EVENT_TYPE (event)) {
401 case GST_EVENT_CUSTOM_UPSTREAM:
402 if (gst_event_has_name (event, "dtmf-event")) {
403 result = gst_dtmf_src_handle_dtmf_event (dtmfsrc, event);
408 result = GST_BASE_SRC_CLASS (parent_class)->event (src, event);
417 gst_dtmf_src_send_event (GstElement * element, GstEvent * event)
419 GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (element);
422 GST_LOG_OBJECT (dtmfsrc, "Received an %s event via send_event",
423 GST_EVENT_TYPE_NAME (event));
425 switch (GST_EVENT_TYPE (event)) {
426 case GST_EVENT_CUSTOM_BOTH:
427 case GST_EVENT_CUSTOM_BOTH_OOB:
428 case GST_EVENT_CUSTOM_UPSTREAM:
429 case GST_EVENT_CUSTOM_DOWNSTREAM:
430 case GST_EVENT_CUSTOM_DOWNSTREAM_OOB:
431 if (gst_event_has_name (event, "dtmf-event")) {
432 ret = gst_dtmf_src_handle_dtmf_event (dtmfsrc, event);
437 ret = GST_ELEMENT_CLASS (parent_class)->send_event (element, event);
445 gst_dtmf_src_set_property (GObject * object, guint prop_id,
446 const GValue * value, GParamSpec * pspec)
450 dtmfsrc = GST_DTMF_SRC (object);
454 dtmfsrc->interval = g_value_get_uint (value);
457 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
463 gst_dtmf_src_get_property (GObject * object, guint prop_id, GValue * value,
468 dtmfsrc = GST_DTMF_SRC (object);
472 g_value_set_uint (value, dtmfsrc->interval);
475 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
481 gst_dtmf_prepare_timestamps (GstDTMFSrc * dtmfsrc)
483 GstClockTime last_stop;
484 GstClockTime timestamp;
486 GST_OBJECT_LOCK (dtmfsrc);
487 last_stop = dtmfsrc->last_stop;
488 GST_OBJECT_UNLOCK (dtmfsrc);
490 if (GST_CLOCK_TIME_IS_VALID (last_stop)) {
491 timestamp = last_stop;
495 /* If there is no valid start time, lets use now as the start time */
497 clock = gst_element_get_clock (GST_ELEMENT (dtmfsrc));
499 timestamp = gst_clock_get_time (clock)
500 - gst_element_get_base_time (GST_ELEMENT (dtmfsrc));
501 gst_object_unref (clock);
503 gchar *dtmf_name = gst_element_get_name (dtmfsrc);
504 GST_ERROR_OBJECT (dtmfsrc, "No clock set for element %s", dtmf_name);
505 dtmfsrc->timestamp = GST_CLOCK_TIME_NONE;
511 /* Make sure the timestamp always goes forward */
512 if (timestamp > dtmfsrc->timestamp)
513 dtmfsrc->timestamp = timestamp;
517 gst_dtmf_src_add_start_event (GstDTMFSrc * dtmfsrc, gint event_number,
521 GstDTMFSrcEvent *event = g_slice_new0 (GstDTMFSrcEvent);
522 event->event_type = DTMF_EVENT_TYPE_START;
524 event->event_number = CLAMP (event_number, MIN_EVENT, MAX_EVENT);
525 event->volume = CLAMP (event_volume, MIN_VOLUME, MAX_VOLUME);
527 g_async_queue_push (dtmfsrc->event_queue, event);
531 gst_dtmf_src_add_stop_event (GstDTMFSrc * dtmfsrc)
534 GstDTMFSrcEvent *event = g_slice_new0 (GstDTMFSrcEvent);
535 event->event_type = DTMF_EVENT_TYPE_STOP;
537 event->event_number = 0;
540 g_async_queue_push (dtmfsrc->event_queue, event);
544 gst_dtmf_src_generate_silence (float duration, gint sample_rate)
548 /* Create a buffer with data set to 0 */
549 buf_size = ((duration / 1000) * sample_rate * SAMPLE_SIZE * CHANNELS) / 8;
551 return gst_buffer_new_wrapped (g_malloc0 (buf_size), buf_size);
555 gst_dtmf_src_generate_tone (GstDTMFSrcEvent * event, DTMF_KEY key,
556 float duration, gint sample_rate)
563 double amplitude, f1, f2;
564 double volume_factor;
565 static GstAllocationParams params = { 0, 1, 0, 0, };
567 /* Create a buffer for the tone */
568 tone_size = ((duration / 1000) * sample_rate * SAMPLE_SIZE * CHANNELS) / 8;
570 buffer = gst_buffer_new_allocate (NULL, tone_size, ¶ms);
572 gst_buffer_map (buffer, &map, GST_MAP_READWRITE);
573 p = (gint16 *) map.data;
575 volume_factor = pow (10, (-event->volume) / 20);
578 * For each sample point we calculate 'x' as the
579 * the amplitude value.
581 for (i = 0; i < (tone_size / (SAMPLE_SIZE / 8)); i++) {
583 * We add the fundamental frequencies together.
585 f1 = sin (2 * M_PI * key.low_frequency * (event->sample / sample_rate));
586 f2 = sin (2 * M_PI * key.high_frequency * (event->sample / sample_rate));
588 amplitude = (f1 + f2) / 2;
590 /* Adjust the volume */
591 amplitude *= volume_factor;
593 /* Make the [-1:1] interval into a [-32767:32767] interval */
596 /* Store it in the data buffer */
597 *(p++) = (gint16) amplitude;
602 gst_buffer_unmap (buffer, &map);
610 gst_dtmf_src_create_next_tone_packet (GstDTMFSrc * dtmfsrc,
611 GstDTMFSrcEvent * event)
613 GstBuffer *buf = NULL;
614 gboolean send_silence = FALSE;
616 GST_LOG_OBJECT (dtmfsrc, "Creating buffer for tone %s",
617 DTMF_KEYS[event->event_number].event_name);
619 if (event->packet_count * dtmfsrc->interval < MIN_INTER_DIGIT_INTERVAL) {
624 GST_LOG_OBJECT (dtmfsrc, "Generating silence");
625 buf = gst_dtmf_src_generate_silence (dtmfsrc->interval,
626 dtmfsrc->sample_rate);
628 GST_LOG_OBJECT (dtmfsrc, "Generating tone");
629 buf = gst_dtmf_src_generate_tone (event, DTMF_KEYS[event->event_number],
630 dtmfsrc->interval, dtmfsrc->sample_rate);
632 event->packet_count++;
635 /* timestamp and duration of GstBuffer */
636 GST_BUFFER_DURATION (buf) = dtmfsrc->interval * GST_MSECOND;
637 GST_BUFFER_TIMESTAMP (buf) = dtmfsrc->timestamp;
639 GST_LOG_OBJECT (dtmfsrc, "Creating new buffer with event %u duration "
640 " gst: %" GST_TIME_FORMAT " at %" GST_TIME_FORMAT,
641 event->event_number, GST_TIME_ARGS (GST_BUFFER_DURATION (buf)),
642 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
644 dtmfsrc->timestamp += GST_BUFFER_DURATION (buf);
650 gst_dtmf_src_post_message (GstDTMFSrc * dtmfsrc, const gchar * message_name,
651 GstDTMFSrcEvent * event)
653 GstStructure *s = NULL;
655 switch (event->event_type) {
656 case DTMF_EVENT_TYPE_START:
657 s = gst_structure_new (message_name,
658 "type", G_TYPE_INT, 1,
659 "method", G_TYPE_INT, 2,
660 "start", G_TYPE_BOOLEAN, TRUE,
661 "number", G_TYPE_INT, event->event_number,
662 "volume", G_TYPE_INT, event->volume, NULL);
664 case DTMF_EVENT_TYPE_STOP:
665 s = gst_structure_new (message_name,
666 "type", G_TYPE_INT, 1, "method", G_TYPE_INT, 2,
667 "start", G_TYPE_BOOLEAN, FALSE, NULL);
669 case DTMF_EVENT_TYPE_PAUSE_TASK:
674 gst_element_post_message (GST_ELEMENT (dtmfsrc),
675 gst_message_new_element (GST_OBJECT (dtmfsrc), s));
679 gst_dtmf_src_create (GstBaseSrc * basesrc, guint64 offset,
680 guint length, GstBuffer ** buffer)
682 GstBuffer *buf = NULL;
683 GstDTMFSrcEvent *event;
687 GstClockReturn clockret;
689 dtmfsrc = GST_DTMF_SRC (basesrc);
693 if (dtmfsrc->last_event == NULL) {
694 GST_DEBUG_OBJECT (dtmfsrc, "popping");
695 event = g_async_queue_pop (dtmfsrc->event_queue);
697 GST_DEBUG_OBJECT (dtmfsrc, "popped %d", event->event_type);
699 switch (event->event_type) {
700 case DTMF_EVENT_TYPE_STOP:
701 GST_WARNING_OBJECT (dtmfsrc,
702 "Received a DTMF stop event when already stopped");
703 gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-dropped", event);
705 case DTMF_EVENT_TYPE_START:
706 gst_dtmf_prepare_timestamps (dtmfsrc);
708 event->packet_count = 0;
709 dtmfsrc->last_event = event;
711 gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-processed",
712 dtmfsrc->last_event);
714 case DTMF_EVENT_TYPE_PAUSE_TASK:
716 * We're pushing it back because it has to stay in there until
717 * the task is really paused (and the queue will then be flushed)
719 GST_DEBUG_OBJECT (dtmfsrc, "pushing pause_task...");
720 GST_OBJECT_LOCK (dtmfsrc);
721 if (dtmfsrc->paused) {
722 g_async_queue_push (dtmfsrc->event_queue, event);
725 GST_OBJECT_UNLOCK (dtmfsrc);
729 g_slice_free (GstDTMFSrcEvent, event);
730 } else if (dtmfsrc->last_event->packet_count * dtmfsrc->interval >=
732 event = g_async_queue_try_pop (dtmfsrc->event_queue);
736 switch (event->event_type) {
737 case DTMF_EVENT_TYPE_START:
738 GST_WARNING_OBJECT (dtmfsrc,
739 "Received two consecutive DTMF start events");
740 gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-dropped", event);
742 case DTMF_EVENT_TYPE_STOP:
743 g_slice_free (GstDTMFSrcEvent, dtmfsrc->last_event);
744 dtmfsrc->last_event = NULL;
745 gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-processed", event);
747 case DTMF_EVENT_TYPE_PAUSE_TASK:
749 * We're pushing it back because it has to stay in there until
750 * the task is really paused (and the queue will then be flushed)
752 GST_DEBUG_OBJECT (dtmfsrc, "pushing pause_task...");
754 GST_OBJECT_LOCK (dtmfsrc);
755 if (dtmfsrc->paused) {
756 g_async_queue_push (dtmfsrc->event_queue, event);
759 GST_OBJECT_UNLOCK (dtmfsrc);
763 g_slice_free (GstDTMFSrcEvent, event);
766 } while (dtmfsrc->last_event == NULL);
768 GST_LOG_OBJECT (dtmfsrc, "end event check, now wait for the proper time");
770 clock = gst_element_get_clock (GST_ELEMENT (basesrc));
772 clockid = gst_clock_new_single_shot_id (clock, dtmfsrc->timestamp +
773 gst_element_get_base_time (GST_ELEMENT (dtmfsrc)));
774 gst_object_unref (clock);
776 GST_OBJECT_LOCK (dtmfsrc);
777 if (!dtmfsrc->paused) {
778 dtmfsrc->clockid = clockid;
779 GST_OBJECT_UNLOCK (dtmfsrc);
781 clockret = gst_clock_id_wait (clockid, NULL);
783 GST_OBJECT_LOCK (dtmfsrc);
785 clockret = GST_CLOCK_UNSCHEDULED;
787 clockret = GST_CLOCK_UNSCHEDULED;
789 gst_clock_id_unref (clockid);
790 dtmfsrc->clockid = NULL;
791 GST_OBJECT_UNLOCK (dtmfsrc);
793 if (clockret == GST_CLOCK_UNSCHEDULED) {
797 buf = gst_dtmf_src_create_next_tone_packet (dtmfsrc, dtmfsrc->last_event);
799 GST_LOG_OBJECT (dtmfsrc, "Created buffer of size %" G_GSIZE_FORMAT,
800 gst_buffer_get_size (buf));
806 GST_OBJECT_UNLOCK (dtmfsrc);
810 if (dtmfsrc->last_event) {
811 GST_DEBUG_OBJECT (dtmfsrc, "Stopping current event");
812 /* Don't forget to release the stream lock */
813 g_slice_free (GstDTMFSrcEvent, dtmfsrc->last_event);
814 dtmfsrc->last_event = NULL;
817 return GST_FLOW_FLUSHING;
822 gst_dtmf_src_unlock (GstBaseSrc * src)
824 GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (src);
825 GstDTMFSrcEvent *event = NULL;
827 GST_DEBUG_OBJECT (dtmfsrc, "Called unlock");
829 GST_OBJECT_LOCK (dtmfsrc);
830 dtmfsrc->paused = TRUE;
831 if (dtmfsrc->clockid) {
832 gst_clock_id_unschedule (dtmfsrc->clockid);
834 GST_OBJECT_UNLOCK (dtmfsrc);
836 GST_DEBUG_OBJECT (dtmfsrc, "Pushing the PAUSE_TASK event on unlock request");
837 event = g_slice_new0 (GstDTMFSrcEvent);
838 event->event_type = DTMF_EVENT_TYPE_PAUSE_TASK;
839 g_async_queue_push (dtmfsrc->event_queue, event);
846 gst_dtmf_src_unlock_stop (GstBaseSrc * src)
848 GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (src);
850 GST_DEBUG_OBJECT (dtmfsrc, "Unlock stopped");
852 GST_OBJECT_LOCK (dtmfsrc);
853 dtmfsrc->paused = FALSE;
854 GST_OBJECT_UNLOCK (dtmfsrc);
861 gst_dtmf_src_negotiate (GstBaseSrc * basesrc)
863 GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (basesrc);
868 caps = gst_pad_get_allowed_caps (GST_BASE_SRC_PAD (basesrc));
871 caps = gst_pad_get_pad_template_caps (GST_BASE_SRC_PAD (basesrc));
873 if (gst_caps_is_empty (caps)) {
874 gst_caps_unref (caps);
878 caps = gst_caps_truncate (caps);
880 caps = gst_caps_make_writable (caps);
881 s = gst_caps_get_structure (caps, 0);
883 gst_structure_fixate_field_nearest_int (s, "rate", DEFAULT_SAMPLE_RATE);
885 if (!gst_structure_get_int (s, "rate", &dtmfsrc->sample_rate)) {
886 GST_ERROR_OBJECT (dtmfsrc, "Could not get rate");
887 gst_caps_unref (caps);
891 ret = gst_pad_set_caps (GST_BASE_SRC_PAD (basesrc), caps);
893 gst_caps_unref (caps);
898 static GstStateChangeReturn
899 gst_dtmf_src_change_state (GstElement * element, GstStateChange transition)
902 GstStateChangeReturn result;
903 gboolean no_preroll = FALSE;
904 GstDTMFSrcEvent *event = NULL;
906 dtmfsrc = GST_DTMF_SRC (element);
908 switch (transition) {
909 case GST_STATE_CHANGE_READY_TO_PAUSED:
910 /* Flushing the event queue */
911 event = g_async_queue_try_pop (dtmfsrc->event_queue);
913 while (event != NULL) {
914 gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-dropped", event);
915 g_slice_free (GstDTMFSrcEvent, event);
916 event = g_async_queue_try_pop (dtmfsrc->event_queue);
918 dtmfsrc->last_event_was_start = FALSE;
919 dtmfsrc->timestamp = 0;
927 GST_ELEMENT_CLASS (gst_dtmf_src_parent_class)->change_state (element,
928 transition)) == GST_STATE_CHANGE_FAILURE)
931 switch (transition) {
932 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
935 case GST_STATE_CHANGE_PAUSED_TO_READY:
936 GST_DEBUG_OBJECT (dtmfsrc, "Flushing event queue");
937 /* Flushing the event queue */
938 event = g_async_queue_try_pop (dtmfsrc->event_queue);
940 while (event != NULL) {
941 gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-dropped", event);
942 g_slice_free (GstDTMFSrcEvent, event);
943 event = g_async_queue_try_pop (dtmfsrc->event_queue);
945 dtmfsrc->last_event_was_start = FALSE;
952 if (no_preroll && result == GST_STATE_CHANGE_SUCCESS)
953 result = GST_STATE_CHANGE_NO_PREROLL;
960 GST_ERROR_OBJECT (dtmfsrc, "parent failed state change");
966 gst_dtmf_src_plugin_init (GstPlugin * plugin)
968 return gst_element_register (plugin, "dtmfsrc",
969 GST_RANK_NONE, GST_TYPE_DTMF_SRC);