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., 51 Franklin St, Fifth Floor,
25 * Boston, MA 02110-1301, 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);
237 static gboolean gst_dtmf_src_query (GstBaseSrc * basesrc, GstQuery * query);
241 gst_dtmf_src_class_init (GstDTMFSrcClass * klass)
243 GObjectClass *gobject_class;
244 GstBaseSrcClass *gstbasesrc_class;
245 GstElementClass *gstelement_class;
247 gobject_class = G_OBJECT_CLASS (klass);
248 gstbasesrc_class = GST_BASE_SRC_CLASS (klass);
249 gstelement_class = GST_ELEMENT_CLASS (klass);
252 GST_DEBUG_CATEGORY_INIT (gst_dtmf_src_debug, "dtmfsrc", 0, "dtmfsrc element");
254 gst_element_class_add_static_pad_template (gstelement_class,
255 &gst_dtmf_src_template);
257 gst_element_class_set_static_metadata (gstelement_class,
258 "DTMF tone generator", "Source/Audio", "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);
281 gstbasesrc_class->query = GST_DEBUG_FUNCPTR (gst_dtmf_src_query);
285 event_free (GstDTMFSrcEvent * event)
288 g_slice_free (GstDTMFSrcEvent, event);
292 gst_dtmf_src_init (GstDTMFSrc * dtmfsrc)
294 /* we operate in time */
295 gst_base_src_set_format (GST_BASE_SRC (dtmfsrc), GST_FORMAT_TIME);
296 gst_base_src_set_live (GST_BASE_SRC (dtmfsrc), TRUE);
298 dtmfsrc->interval = DEFAULT_PACKET_INTERVAL;
300 dtmfsrc->event_queue = g_async_queue_new_full ((GDestroyNotify) event_free);
301 dtmfsrc->last_event = NULL;
303 dtmfsrc->sample_rate = DEFAULT_SAMPLE_RATE;
305 GST_DEBUG_OBJECT (dtmfsrc, "init done");
309 gst_dtmf_src_finalize (GObject * object)
313 dtmfsrc = GST_DTMF_SRC (object);
315 if (dtmfsrc->event_queue) {
316 g_async_queue_unref (dtmfsrc->event_queue);
317 dtmfsrc->event_queue = NULL;
320 G_OBJECT_CLASS (gst_dtmf_src_parent_class)->finalize (object);
324 gst_dtmf_src_handle_dtmf_event (GstDTMFSrc * dtmfsrc, GstEvent * event)
326 const GstStructure *event_structure;
327 GstStateChangeReturn sret;
332 GstClockTime last_stop;
335 gboolean correct_order;
337 sret = gst_element_get_state (GST_ELEMENT (dtmfsrc), &state, NULL, 0);
338 if (sret != GST_STATE_CHANGE_SUCCESS || state != GST_STATE_PLAYING) {
339 GST_DEBUG_OBJECT (dtmfsrc, "dtmf-event, but not in PLAYING state");
343 event_structure = gst_event_get_structure (event);
345 if (!gst_structure_get_int (event_structure, "type", &event_type) ||
346 !gst_structure_get_boolean (event_structure, "start", &start) ||
347 (start == TRUE && event_type != GST_TONE_DTMF_TYPE_EVENT))
350 if (gst_structure_get_int (event_structure, "method", &method)) {
357 if (!gst_structure_get_int (event_structure, "number", &event_number) ||
358 !gst_structure_get_int (event_structure, "volume", &event_volume))
362 GST_OBJECT_LOCK (dtmfsrc);
363 if (gst_structure_get_clock_time (event_structure, "last-stop", &last_stop))
364 dtmfsrc->last_stop = last_stop;
366 dtmfsrc->last_stop = GST_CLOCK_TIME_NONE;
367 correct_order = (start != dtmfsrc->last_event_was_start);
368 dtmfsrc->last_event_was_start = start;
369 GST_OBJECT_UNLOCK (dtmfsrc);
375 GST_DEBUG_OBJECT (dtmfsrc, "Received start event %d with volume %d",
376 event_number, event_volume);
377 gst_dtmf_src_add_start_event (dtmfsrc, event_number, event_volume);
381 GST_DEBUG_OBJECT (dtmfsrc, "Received stop event");
382 gst_dtmf_src_add_stop_event (dtmfsrc);
391 gst_dtmf_src_handle_event (GstBaseSrc * src, GstEvent * event)
394 gboolean result = FALSE;
396 dtmfsrc = GST_DTMF_SRC (src);
398 GST_LOG_OBJECT (dtmfsrc, "Received an %s event on the src pad",
399 GST_EVENT_TYPE_NAME (event));
401 switch (GST_EVENT_TYPE (event)) {
402 case GST_EVENT_CUSTOM_UPSTREAM:
403 if (gst_event_has_name (event, "dtmf-event")) {
404 result = gst_dtmf_src_handle_dtmf_event (dtmfsrc, event);
409 result = GST_BASE_SRC_CLASS (parent_class)->event (src, event);
418 gst_dtmf_src_send_event (GstElement * element, GstEvent * event)
420 GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (element);
423 GST_LOG_OBJECT (dtmfsrc, "Received an %s event via send_event",
424 GST_EVENT_TYPE_NAME (event));
426 switch (GST_EVENT_TYPE (event)) {
427 case GST_EVENT_CUSTOM_BOTH:
428 case GST_EVENT_CUSTOM_BOTH_OOB:
429 case GST_EVENT_CUSTOM_UPSTREAM:
430 case GST_EVENT_CUSTOM_DOWNSTREAM:
431 case GST_EVENT_CUSTOM_DOWNSTREAM_OOB:
432 if (gst_event_has_name (event, "dtmf-event")) {
433 ret = gst_dtmf_src_handle_dtmf_event (dtmfsrc, event);
438 ret = GST_ELEMENT_CLASS (parent_class)->send_event (element, event);
446 gst_dtmf_src_set_property (GObject * object, guint prop_id,
447 const GValue * value, GParamSpec * pspec)
451 dtmfsrc = GST_DTMF_SRC (object);
455 dtmfsrc->interval = g_value_get_uint (value);
458 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
464 gst_dtmf_src_get_property (GObject * object, guint prop_id, GValue * value,
469 dtmfsrc = GST_DTMF_SRC (object);
473 g_value_set_uint (value, dtmfsrc->interval);
476 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
482 gst_dtmf_prepare_timestamps (GstDTMFSrc * dtmfsrc)
484 GstClockTime last_stop;
485 GstClockTime timestamp;
487 GST_OBJECT_LOCK (dtmfsrc);
488 last_stop = dtmfsrc->last_stop;
489 GST_OBJECT_UNLOCK (dtmfsrc);
491 if (GST_CLOCK_TIME_IS_VALID (last_stop)) {
492 timestamp = last_stop;
496 /* If there is no valid start time, lets use now as the start time */
498 clock = gst_element_get_clock (GST_ELEMENT (dtmfsrc));
500 timestamp = gst_clock_get_time (clock)
501 - gst_element_get_base_time (GST_ELEMENT (dtmfsrc));
502 gst_object_unref (clock);
504 gchar *dtmf_name = gst_element_get_name (dtmfsrc);
505 GST_ERROR_OBJECT (dtmfsrc, "No clock set for element %s", dtmf_name);
506 dtmfsrc->timestamp = GST_CLOCK_TIME_NONE;
512 /* Make sure the timestamp always goes forward */
513 if (timestamp > dtmfsrc->timestamp)
514 dtmfsrc->timestamp = timestamp;
518 gst_dtmf_src_add_start_event (GstDTMFSrc * dtmfsrc, gint event_number,
522 GstDTMFSrcEvent *event = g_slice_new0 (GstDTMFSrcEvent);
523 event->event_type = DTMF_EVENT_TYPE_START;
525 event->event_number = CLAMP (event_number, MIN_EVENT, MAX_EVENT);
526 event->volume = CLAMP (event_volume, MIN_VOLUME, MAX_VOLUME);
528 g_async_queue_push (dtmfsrc->event_queue, event);
532 gst_dtmf_src_add_stop_event (GstDTMFSrc * dtmfsrc)
535 GstDTMFSrcEvent *event = g_slice_new0 (GstDTMFSrcEvent);
536 event->event_type = DTMF_EVENT_TYPE_STOP;
538 event->event_number = 0;
541 g_async_queue_push (dtmfsrc->event_queue, event);
545 gst_dtmf_src_generate_silence (float duration, gint sample_rate)
549 /* Create a buffer with data set to 0 */
550 buf_size = ((duration / 1000) * sample_rate * SAMPLE_SIZE * CHANNELS) / 8;
552 return gst_buffer_new_wrapped (g_malloc0 (buf_size), buf_size);
556 gst_dtmf_src_generate_tone (GstDTMFSrcEvent * event, DTMF_KEY key,
557 float duration, gint sample_rate)
564 double amplitude, f1, f2;
565 double volume_factor;
566 static GstAllocationParams params = { 0, 1, 0, 0, };
568 /* Create a buffer for the tone */
569 tone_size = ((duration / 1000) * sample_rate * SAMPLE_SIZE * CHANNELS) / 8;
571 buffer = gst_buffer_new_allocate (NULL, tone_size, ¶ms);
573 gst_buffer_map (buffer, &map, GST_MAP_READWRITE);
574 p = (gint16 *) map.data;
576 volume_factor = pow (10, (-event->volume) / 20);
579 * For each sample point we calculate 'x' as the
580 * the amplitude value.
582 for (i = 0; i < (tone_size / (SAMPLE_SIZE / 8)); i++) {
584 * We add the fundamental frequencies together.
586 f1 = sin (2 * M_PI * key.low_frequency * (event->sample / sample_rate));
587 f2 = sin (2 * M_PI * key.high_frequency * (event->sample / sample_rate));
589 amplitude = (f1 + f2) / 2;
591 /* Adjust the volume */
592 amplitude *= volume_factor;
594 /* Make the [-1:1] interval into a [-32767:32767] interval */
597 /* Store it in the data buffer */
598 *(p++) = (gint16) amplitude;
603 gst_buffer_unmap (buffer, &map);
611 gst_dtmf_src_create_next_tone_packet (GstDTMFSrc * dtmfsrc,
612 GstDTMFSrcEvent * event)
614 GstBuffer *buf = NULL;
615 gboolean send_silence = FALSE;
617 GST_LOG_OBJECT (dtmfsrc, "Creating buffer for tone %s",
618 DTMF_KEYS[event->event_number].event_name);
620 if (event->packet_count * dtmfsrc->interval < MIN_INTER_DIGIT_INTERVAL) {
625 GST_LOG_OBJECT (dtmfsrc, "Generating silence");
626 buf = gst_dtmf_src_generate_silence (dtmfsrc->interval,
627 dtmfsrc->sample_rate);
629 GST_LOG_OBJECT (dtmfsrc, "Generating tone");
630 buf = gst_dtmf_src_generate_tone (event, DTMF_KEYS[event->event_number],
631 dtmfsrc->interval, dtmfsrc->sample_rate);
633 event->packet_count++;
636 /* timestamp and duration of GstBuffer */
637 GST_BUFFER_DURATION (buf) = dtmfsrc->interval * GST_MSECOND;
638 GST_BUFFER_TIMESTAMP (buf) = dtmfsrc->timestamp;
640 GST_LOG_OBJECT (dtmfsrc, "Creating new buffer with event %u duration "
641 " gst: %" GST_TIME_FORMAT " at %" GST_TIME_FORMAT,
642 event->event_number, GST_TIME_ARGS (GST_BUFFER_DURATION (buf)),
643 GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)));
645 dtmfsrc->timestamp += GST_BUFFER_DURATION (buf);
651 gst_dtmf_src_post_message (GstDTMFSrc * dtmfsrc, const gchar * message_name,
652 GstDTMFSrcEvent * event)
654 GstStructure *s = NULL;
656 switch (event->event_type) {
657 case DTMF_EVENT_TYPE_START:
658 s = gst_structure_new (message_name,
659 "type", G_TYPE_INT, 1,
660 "method", G_TYPE_INT, 2,
661 "start", G_TYPE_BOOLEAN, TRUE,
662 "number", G_TYPE_INT, event->event_number,
663 "volume", G_TYPE_INT, event->volume, NULL);
665 case DTMF_EVENT_TYPE_STOP:
666 s = gst_structure_new (message_name,
667 "type", G_TYPE_INT, 1, "method", G_TYPE_INT, 2,
668 "start", G_TYPE_BOOLEAN, FALSE, NULL);
670 case DTMF_EVENT_TYPE_PAUSE_TASK:
675 gst_element_post_message (GST_ELEMENT (dtmfsrc),
676 gst_message_new_element (GST_OBJECT (dtmfsrc), s));
680 gst_dtmf_src_create (GstBaseSrc * basesrc, guint64 offset,
681 guint length, GstBuffer ** buffer)
683 GstBuffer *buf = NULL;
684 GstDTMFSrcEvent *event;
688 GstClockReturn clockret;
690 dtmfsrc = GST_DTMF_SRC (basesrc);
694 if (dtmfsrc->last_event == NULL) {
695 GST_DEBUG_OBJECT (dtmfsrc, "popping");
696 event = g_async_queue_pop (dtmfsrc->event_queue);
698 GST_DEBUG_OBJECT (dtmfsrc, "popped %d", event->event_type);
700 switch (event->event_type) {
701 case DTMF_EVENT_TYPE_STOP:
702 GST_WARNING_OBJECT (dtmfsrc,
703 "Received a DTMF stop event when already stopped");
704 gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-dropped", event);
706 case DTMF_EVENT_TYPE_START:
707 gst_dtmf_prepare_timestamps (dtmfsrc);
709 event->packet_count = 0;
710 dtmfsrc->last_event = event;
712 gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-processed",
713 dtmfsrc->last_event);
715 case DTMF_EVENT_TYPE_PAUSE_TASK:
717 * We're pushing it back because it has to stay in there until
718 * the task is really paused (and the queue will then be flushed)
720 GST_DEBUG_OBJECT (dtmfsrc, "pushing pause_task...");
721 GST_OBJECT_LOCK (dtmfsrc);
722 if (dtmfsrc->paused) {
723 g_async_queue_push (dtmfsrc->event_queue, event);
726 GST_OBJECT_UNLOCK (dtmfsrc);
730 g_slice_free (GstDTMFSrcEvent, event);
731 } else if (dtmfsrc->last_event->packet_count * dtmfsrc->interval >=
733 event = g_async_queue_try_pop (dtmfsrc->event_queue);
737 switch (event->event_type) {
738 case DTMF_EVENT_TYPE_START:
739 GST_WARNING_OBJECT (dtmfsrc,
740 "Received two consecutive DTMF start events");
741 gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-dropped", event);
743 case DTMF_EVENT_TYPE_STOP:
744 g_slice_free (GstDTMFSrcEvent, dtmfsrc->last_event);
745 dtmfsrc->last_event = NULL;
746 gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-processed", event);
748 case DTMF_EVENT_TYPE_PAUSE_TASK:
750 * We're pushing it back because it has to stay in there until
751 * the task is really paused (and the queue will then be flushed)
753 GST_DEBUG_OBJECT (dtmfsrc, "pushing pause_task...");
755 GST_OBJECT_LOCK (dtmfsrc);
756 if (dtmfsrc->paused) {
757 g_async_queue_push (dtmfsrc->event_queue, event);
760 GST_OBJECT_UNLOCK (dtmfsrc);
764 g_slice_free (GstDTMFSrcEvent, event);
767 } while (dtmfsrc->last_event == NULL);
769 GST_LOG_OBJECT (dtmfsrc, "end event check, now wait for the proper time");
771 clock = gst_element_get_clock (GST_ELEMENT (basesrc));
773 clockid = gst_clock_new_single_shot_id (clock, dtmfsrc->timestamp +
774 gst_element_get_base_time (GST_ELEMENT (dtmfsrc)));
775 gst_object_unref (clock);
777 GST_OBJECT_LOCK (dtmfsrc);
778 if (!dtmfsrc->paused) {
779 dtmfsrc->clockid = clockid;
780 GST_OBJECT_UNLOCK (dtmfsrc);
782 clockret = gst_clock_id_wait (clockid, NULL);
784 GST_OBJECT_LOCK (dtmfsrc);
786 clockret = GST_CLOCK_UNSCHEDULED;
788 clockret = GST_CLOCK_UNSCHEDULED;
790 gst_clock_id_unref (clockid);
791 dtmfsrc->clockid = NULL;
792 GST_OBJECT_UNLOCK (dtmfsrc);
794 if (clockret == GST_CLOCK_UNSCHEDULED) {
798 buf = gst_dtmf_src_create_next_tone_packet (dtmfsrc, dtmfsrc->last_event);
800 GST_LOG_OBJECT (dtmfsrc, "Created buffer of size %" G_GSIZE_FORMAT,
801 gst_buffer_get_size (buf));
807 GST_OBJECT_UNLOCK (dtmfsrc);
811 if (dtmfsrc->last_event) {
812 GST_DEBUG_OBJECT (dtmfsrc, "Stopping current event");
813 /* Don't forget to release the stream lock */
814 g_slice_free (GstDTMFSrcEvent, dtmfsrc->last_event);
815 dtmfsrc->last_event = NULL;
818 return GST_FLOW_FLUSHING;
823 gst_dtmf_src_unlock (GstBaseSrc * src)
825 GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (src);
826 GstDTMFSrcEvent *event = NULL;
828 GST_DEBUG_OBJECT (dtmfsrc, "Called unlock");
830 GST_OBJECT_LOCK (dtmfsrc);
831 dtmfsrc->paused = TRUE;
832 if (dtmfsrc->clockid) {
833 gst_clock_id_unschedule (dtmfsrc->clockid);
835 GST_OBJECT_UNLOCK (dtmfsrc);
837 GST_DEBUG_OBJECT (dtmfsrc, "Pushing the PAUSE_TASK event on unlock request");
838 event = g_slice_new0 (GstDTMFSrcEvent);
839 event->event_type = DTMF_EVENT_TYPE_PAUSE_TASK;
840 g_async_queue_push (dtmfsrc->event_queue, event);
847 gst_dtmf_src_unlock_stop (GstBaseSrc * src)
849 GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (src);
851 GST_DEBUG_OBJECT (dtmfsrc, "Unlock stopped");
853 GST_OBJECT_LOCK (dtmfsrc);
854 dtmfsrc->paused = FALSE;
855 GST_OBJECT_UNLOCK (dtmfsrc);
862 gst_dtmf_src_negotiate (GstBaseSrc * basesrc)
864 GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (basesrc);
869 caps = gst_pad_get_allowed_caps (GST_BASE_SRC_PAD (basesrc));
872 caps = gst_pad_get_pad_template_caps (GST_BASE_SRC_PAD (basesrc));
874 if (gst_caps_is_empty (caps)) {
875 gst_caps_unref (caps);
879 caps = gst_caps_truncate (caps);
881 caps = gst_caps_make_writable (caps);
882 s = gst_caps_get_structure (caps, 0);
884 gst_structure_fixate_field_nearest_int (s, "rate", DEFAULT_SAMPLE_RATE);
886 if (!gst_structure_get_int (s, "rate", &dtmfsrc->sample_rate)) {
887 GST_ERROR_OBJECT (dtmfsrc, "Could not get rate");
888 gst_caps_unref (caps);
892 ret = gst_pad_set_caps (GST_BASE_SRC_PAD (basesrc), caps);
894 gst_caps_unref (caps);
900 gst_dtmf_src_query (GstBaseSrc * basesrc, GstQuery * query)
902 GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (basesrc);
903 gboolean res = FALSE;
905 switch (GST_QUERY_TYPE (query)) {
906 case GST_QUERY_LATENCY:
908 GstClockTime latency;
910 latency = dtmfsrc->interval * GST_MSECOND;
911 gst_query_set_latency (query, gst_base_src_is_live (basesrc), latency,
912 GST_CLOCK_TIME_NONE);
913 GST_DEBUG_OBJECT (dtmfsrc, "Reporting latency of %" GST_TIME_FORMAT,
914 GST_TIME_ARGS (latency));
919 res = GST_BASE_SRC_CLASS (parent_class)->query (basesrc, query);
926 static GstStateChangeReturn
927 gst_dtmf_src_change_state (GstElement * element, GstStateChange transition)
930 GstStateChangeReturn result;
931 gboolean no_preroll = FALSE;
932 GstDTMFSrcEvent *event = NULL;
934 dtmfsrc = GST_DTMF_SRC (element);
936 switch (transition) {
937 case GST_STATE_CHANGE_READY_TO_PAUSED:
938 /* Flushing the event queue */
939 event = g_async_queue_try_pop (dtmfsrc->event_queue);
941 while (event != NULL) {
942 gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-dropped", event);
943 g_slice_free (GstDTMFSrcEvent, event);
944 event = g_async_queue_try_pop (dtmfsrc->event_queue);
946 dtmfsrc->last_event_was_start = FALSE;
947 dtmfsrc->timestamp = 0;
955 GST_ELEMENT_CLASS (gst_dtmf_src_parent_class)->change_state (element,
956 transition)) == GST_STATE_CHANGE_FAILURE)
959 switch (transition) {
960 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
963 case GST_STATE_CHANGE_PAUSED_TO_READY:
964 GST_DEBUG_OBJECT (dtmfsrc, "Flushing event queue");
965 /* Flushing the event queue */
966 event = g_async_queue_try_pop (dtmfsrc->event_queue);
968 while (event != NULL) {
969 gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-dropped", event);
970 g_slice_free (GstDTMFSrcEvent, event);
971 event = g_async_queue_try_pop (dtmfsrc->event_queue);
973 dtmfsrc->last_event_was_start = FALSE;
980 if (no_preroll && result == GST_STATE_CHANGE_SUCCESS)
981 result = GST_STATE_CHANGE_NO_PREROLL;
988 GST_ERROR_OBJECT (dtmfsrc, "parent failed state change");
994 gst_dtmf_src_plugin_init (GstPlugin * plugin)
996 return gst_element_register (plugin, "dtmfsrc",
997 GST_RANK_NONE, GST_TYPE_DTMF_SRC);