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);
254 static gboolean gst_dtmf_src_negotiate (GstBaseSrc * basesrc);
257 gst_dtmf_src_base_init (gpointer g_class)
259 GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
261 GST_DEBUG_CATEGORY_INIT (gst_dtmf_src_debug,
262 "dtmfsrc", 0, "dtmfsrc element");
264 gst_element_class_add_pad_template (element_class,
265 gst_static_pad_template_get (&gst_dtmf_src_template));
267 gst_element_class_set_details (element_class, &gst_dtmf_src_details);
271 gst_dtmf_src_class_init (GstDTMFSrcClass * klass)
273 GObjectClass *gobject_class;
274 GstBaseSrcClass *gstbasesrc_class;
275 GstElementClass *gstelement_class;
277 gobject_class = G_OBJECT_CLASS (klass);
278 gstbasesrc_class = GST_BASE_SRC_CLASS (klass);
279 gstelement_class = GST_ELEMENT_CLASS (klass);
282 gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_dtmf_src_finalize);
283 gobject_class->set_property =
284 GST_DEBUG_FUNCPTR (gst_dtmf_src_set_property);
285 gobject_class->get_property =
286 GST_DEBUG_FUNCPTR (gst_dtmf_src_get_property);
288 g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_INTERVAL,
289 g_param_spec_uint ("interval", "Interval between tone packets",
290 "Interval in ms between two tone packets", MIN_PACKET_INTERVAL,
291 MAX_PACKET_INTERVAL, DEFAULT_PACKET_INTERVAL, G_PARAM_READWRITE));
293 gstelement_class->change_state =
294 GST_DEBUG_FUNCPTR (gst_dtmf_src_change_state);
295 gstbasesrc_class->unlock =
296 GST_DEBUG_FUNCPTR (gst_dtmf_src_unlock);
297 gstbasesrc_class->unlock_stop =
298 GST_DEBUG_FUNCPTR (gst_dtmf_src_unlock_stop);
300 gstbasesrc_class->event =
301 GST_DEBUG_FUNCPTR (gst_dtmf_src_handle_event);
302 gstbasesrc_class->create =
303 GST_DEBUG_FUNCPTR (gst_dtmf_src_create);
304 gstbasesrc_class->negotiate =
305 GST_DEBUG_FUNCPTR (gst_dtmf_src_negotiate);
310 gst_dtmf_src_init (GstDTMFSrc * dtmfsrc, GstDTMFSrcClass *g_class)
312 /* we operate in time */
313 gst_base_src_set_format (GST_BASE_SRC (dtmfsrc), GST_FORMAT_TIME);
314 gst_base_src_set_live (GST_BASE_SRC (dtmfsrc), TRUE);
316 dtmfsrc->interval = DEFAULT_PACKET_INTERVAL;
318 dtmfsrc->event_queue = g_async_queue_new ();
319 dtmfsrc->last_event = NULL;
321 dtmfsrc->sample_rate = DEFAULT_SAMPLE_RATE;
323 GST_DEBUG_OBJECT (dtmfsrc, "init done");
327 gst_dtmf_src_finalize (GObject * object)
331 dtmfsrc = GST_DTMF_SRC (object);
333 if (dtmfsrc->event_queue) {
334 g_async_queue_unref (dtmfsrc->event_queue);
335 dtmfsrc->event_queue = NULL;
338 G_OBJECT_CLASS (parent_class)->finalize (object);
342 gst_dtmf_src_handle_dtmf_event (GstDTMFSrc *dtmfsrc,
343 const GstStructure * event_structure)
349 if (!gst_structure_get_int (event_structure, "type", &event_type) ||
350 !gst_structure_get_boolean (event_structure, "start", &start) ||
351 (start == TRUE && event_type != GST_TONE_DTMF_TYPE_EVENT))
354 if (gst_structure_get_int (event_structure, "method", &method)) {
364 if (!gst_structure_get_int (event_structure, "number", &event_number) ||
365 !gst_structure_get_int (event_structure, "volume", &event_volume))
368 GST_DEBUG_OBJECT (dtmfsrc, "Received start event %d with volume %d",
369 event_number, event_volume);
370 gst_dtmf_src_add_start_event (dtmfsrc, event_number, event_volume);
374 GST_DEBUG_OBJECT (dtmfsrc, "Received stop event");
375 gst_dtmf_src_add_stop_event (dtmfsrc);
384 gst_dtmf_src_handle_custom_upstream (GstDTMFSrc *dtmfsrc,
387 gboolean result = FALSE;
388 const GstStructure *structure;
390 GstStateChangeReturn ret;
392 ret = gst_element_get_state (GST_ELEMENT (dtmfsrc), &state, NULL, 0);
393 if (ret != GST_STATE_CHANGE_SUCCESS || state != GST_STATE_PLAYING) {
394 GST_DEBUG_OBJECT (dtmfsrc, "Received event while not in PLAYING state");
398 GST_DEBUG_OBJECT (dtmfsrc, "Received event is of our interest");
399 structure = gst_event_get_structure (event);
400 if (structure && gst_structure_has_name (structure, "dtmf-event"))
401 result = gst_dtmf_src_handle_dtmf_event (dtmfsrc, structure);
408 gst_dtmf_src_handle_event (GstBaseSrc * src, GstEvent * event)
411 gboolean result = FALSE;
413 dtmfsrc = GST_DTMF_SRC (src);
415 GST_DEBUG_OBJECT (dtmfsrc, "Received an event on the src pad");
416 if (GST_EVENT_TYPE (event) == GST_EVENT_CUSTOM_UPSTREAM) {
417 result = gst_dtmf_src_handle_custom_upstream (dtmfsrc, event);
424 gst_dtmf_src_set_property (GObject * object, guint prop_id,
425 const GValue * value, GParamSpec * pspec)
429 dtmfsrc = GST_DTMF_SRC (object);
433 dtmfsrc->interval = g_value_get_uint (value);
436 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
442 gst_dtmf_src_get_property (GObject * object, guint prop_id, GValue * value,
447 dtmfsrc = GST_DTMF_SRC (object);
451 g_value_set_uint (value, dtmfsrc->interval);
454 G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
460 gst_dtmf_src_set_stream_lock (GstDTMFSrc *dtmfsrc, gboolean lock)
462 GstPad *srcpad = GST_BASE_SRC_PAD (dtmfsrc);
464 GstStructure *structure;
466 structure = gst_structure_new ("stream-lock",
467 "lock", G_TYPE_BOOLEAN, lock, NULL);
469 event = gst_event_new_custom (GST_EVENT_CUSTOM_DOWNSTREAM_OOB, structure);
470 if (!gst_pad_push_event (srcpad, event)) {
471 GST_WARNING_OBJECT (dtmfsrc, "stream-lock event not handled");
476 gst_dtmf_prepare_timestamps (GstDTMFSrc *dtmfsrc)
479 GstClockTime base_time;
481 base_time = gst_element_get_base_time (GST_ELEMENT (dtmfsrc));
483 clock = gst_element_get_clock (GST_ELEMENT (dtmfsrc));
486 dtmfsrc->timestamp = gst_clock_get_time (clock);
488 dtmfsrc->timestamp = gst_clock_get_time (clock) - base_time;
490 gst_object_unref (clock);
492 gchar *dtmf_name = gst_element_get_name (dtmfsrc);
493 GST_ERROR_OBJECT (dtmfsrc, "No clock set for element %s", dtmf_name);
494 dtmfsrc->timestamp = GST_CLOCK_TIME_NONE;
500 gst_dtmf_src_add_start_event (GstDTMFSrc *dtmfsrc, gint event_number,
504 GstDTMFSrcEvent * event = g_malloc (sizeof(GstDTMFSrcEvent));
505 event->event_type = DTMF_EVENT_TYPE_START;
507 event->event_number = CLAMP (event_number, MIN_EVENT, MAX_EVENT);
508 event->volume = CLAMP (event_volume, MIN_VOLUME, MAX_VOLUME);
510 g_async_queue_push (dtmfsrc->event_queue, event);
514 gst_dtmf_src_add_stop_event (GstDTMFSrc *dtmfsrc)
517 GstDTMFSrcEvent * event = g_malloc (sizeof(GstDTMFSrcEvent));
518 event->event_type = DTMF_EVENT_TYPE_STOP;
520 event->event_number = 0;
523 g_async_queue_push (dtmfsrc->event_queue, event);
527 gst_dtmf_src_generate_silence(GstBuffer * buffer, float duration,
532 /* Create a buffer with data set to 0 */
533 buf_size = ((duration/1000)*sample_rate*SAMPLE_SIZE*CHANNELS)/8;
534 GST_BUFFER_SIZE (buffer) = buf_size;
535 GST_BUFFER_MALLOCDATA (buffer) = g_malloc0(buf_size);
536 GST_BUFFER_DATA (buffer) = GST_BUFFER_MALLOCDATA (buffer);
541 gst_dtmf_src_generate_tone(GstDTMFSrcEvent *event, DTMF_KEY key, float duration,
542 GstBuffer * buffer, gint sample_rate)
547 double amplitude, f1, f2;
548 double volume_factor;
550 /* Create a buffer for the tone */
551 tone_size = ((duration/1000)*sample_rate*SAMPLE_SIZE*CHANNELS)/8;
552 GST_BUFFER_SIZE (buffer) = tone_size;
553 GST_BUFFER_MALLOCDATA (buffer) = g_malloc(tone_size);
554 GST_BUFFER_DATA (buffer) = GST_BUFFER_MALLOCDATA (buffer);
556 p = (gint16 *) GST_BUFFER_MALLOCDATA (buffer);
558 volume_factor = pow (10, (-event->volume) / 20);
561 * For each sample point we calculate 'x' as the
562 * the amplitude value.
564 for (i = 0; i < (tone_size / (SAMPLE_SIZE/8)); i++) {
566 * We add the fundamental frequencies together.
568 f1 = sin(2 * M_PI * key.low_frequency * (event->sample / sample_rate));
569 f2 = sin(2 * M_PI * key.high_frequency * (event->sample / sample_rate));
571 amplitude = (f1 + f2) / 2;
573 /* Adjust the volume */
574 amplitude *= volume_factor;
576 /* Make the [-1:1] interval into a [-32767:32767] interval */
579 /* Store it in the data buffer */
580 *(p++) = (gint16) amplitude;
589 gst_dtmf_src_create_next_tone_packet (GstDTMFSrc *dtmfsrc,
590 GstDTMFSrcEvent *event)
592 GstBuffer *buf = NULL;
593 gboolean send_silence = FALSE;
594 GstPad *srcpad = GST_BASE_SRC_PAD (dtmfsrc);
596 GST_DEBUG_OBJECT (dtmfsrc, "Creating buffer for tone %s",
597 DTMF_KEYS[event->event_number].event_name);
599 /* create buffer to hold the tone */
600 buf = gst_buffer_new ();
602 if (event->packet_count * dtmfsrc->interval < MIN_INTER_DIGIT_INTERVAL) {
607 GST_DEBUG_OBJECT (dtmfsrc, "Generating silence");
608 gst_dtmf_src_generate_silence (buf, dtmfsrc->interval,
609 dtmfsrc->sample_rate);
611 GST_DEBUG_OBJECT (dtmfsrc, "Generating tone");
612 gst_dtmf_src_generate_tone(event, DTMF_KEYS[event->event_number],
613 dtmfsrc->interval, buf, dtmfsrc->sample_rate);
615 event->packet_count++;
618 /* timestamp and duration of GstBuffer */
619 GST_BUFFER_DURATION (buf) = dtmfsrc->interval * GST_MSECOND;
620 GST_BUFFER_TIMESTAMP (buf) = dtmfsrc->timestamp;
621 dtmfsrc->timestamp += GST_BUFFER_DURATION (buf);
623 /* Set caps on the buffer before pushing it */
624 gst_buffer_set_caps (buf, GST_PAD_CAPS (srcpad));
630 gst_dtmf_src_create (GstBaseSrc * basesrc, guint64 offset,
631 guint length, GstBuffer ** buffer)
633 GstBuffer *buf = NULL;
634 GstDTMFSrcEvent *event;
635 GstDTMFSrc * dtmfsrc;
638 GstClockReturn clockret;
640 dtmfsrc = GST_DTMF_SRC (basesrc);
644 if (dtmfsrc->last_event == NULL) {
645 GST_DEBUG_OBJECT (dtmfsrc, "popping");
646 event = g_async_queue_pop (dtmfsrc->event_queue);
648 GST_DEBUG_OBJECT (dtmfsrc, "popped %d", event->event_type);
650 switch (event->event_type) {
651 case DTMF_EVENT_TYPE_STOP:
652 GST_WARNING_OBJECT (dtmfsrc,
653 "Received a DTMF stop event when already stopped");
655 case DTMF_EVENT_TYPE_START:
656 gst_dtmf_prepare_timestamps (dtmfsrc);
658 /* Don't forget to get exclusive access to the stream */
659 gst_dtmf_src_set_stream_lock (dtmfsrc, TRUE);
661 event->packet_count = 0;
662 dtmfsrc->last_event = event;
665 case DTMF_EVENT_TYPE_PAUSE_TASK:
667 * We're pushing it back because it has to stay in there until
668 * the task is really paused (and the queue will then be flushed)
670 GST_DEBUG_OBJECT (dtmfsrc, "pushing pause_task...");
671 GST_OBJECT_LOCK (dtmfsrc);
672 if (dtmfsrc->paused) {
673 g_async_queue_push (dtmfsrc->event_queue, event);
676 GST_OBJECT_UNLOCK (dtmfsrc);
681 } else if (dtmfsrc->last_event->packet_count * dtmfsrc->interval >=
683 event = g_async_queue_try_pop (dtmfsrc->event_queue);
687 switch (event->event_type) {
688 case DTMF_EVENT_TYPE_START:
689 GST_WARNING_OBJECT (dtmfsrc,
690 "Received two consecutive DTMF start events");
692 case DTMF_EVENT_TYPE_STOP:
693 gst_dtmf_src_set_stream_lock (dtmfsrc, FALSE);
695 g_free (dtmfsrc->last_event);
696 dtmfsrc->last_event = NULL;
698 case DTMF_EVENT_TYPE_PAUSE_TASK:
700 * We're pushing it back because it has to stay in there until
701 * the task is really paused (and the queue will then be flushed)
703 GST_DEBUG_OBJECT (dtmfsrc, "pushing pause_task...");
705 GST_OBJECT_LOCK (dtmfsrc);
706 if (dtmfsrc->paused) {
707 g_async_queue_push (dtmfsrc->event_queue, event);
710 GST_OBJECT_UNLOCK (dtmfsrc);
717 } while (dtmfsrc->last_event == NULL);
719 GST_DEBUG_OBJECT (dtmfsrc, "end event check, now wait for the proper time");
721 clock = gst_element_get_clock (GST_ELEMENT (basesrc));
724 clockid = gst_clock_new_single_shot_id (clock, dtmfsrc->timestamp);
726 clockid = gst_clock_new_single_shot_id (clock, dtmfsrc->timestamp +
727 gst_element_get_base_time (GST_ELEMENT (dtmfsrc)));
729 gst_object_unref (clock);
731 GST_OBJECT_LOCK (dtmfsrc);
732 if (!dtmfsrc->paused) {
733 dtmfsrc->clockid = clockid;
734 GST_OBJECT_UNLOCK (dtmfsrc);
736 clockret = gst_clock_id_wait (clockid, NULL);
738 GST_OBJECT_LOCK (dtmfsrc);
740 clockret = GST_CLOCK_UNSCHEDULED;
742 clockret = GST_CLOCK_UNSCHEDULED;
744 gst_clock_id_unref (clockid);
745 dtmfsrc->clockid = NULL;
746 GST_OBJECT_UNLOCK (dtmfsrc);
748 if (clockret == GST_CLOCK_UNSCHEDULED) {
752 buf = gst_dtmf_src_create_next_tone_packet (dtmfsrc, dtmfsrc->last_event);
754 GST_DEBUG_OBJECT (dtmfsrc, "Created buffer of size %d", GST_BUFFER_SIZE (buf));
757 GST_DEBUG_OBJECT (dtmfsrc, "returning a buffer");
761 GST_OBJECT_UNLOCK (dtmfsrc);
765 if (dtmfsrc->last_event) {
766 GST_DEBUG_OBJECT (dtmfsrc, "Stopping current event");
767 /* Don't forget to release the stream lock */
768 gst_dtmf_src_set_stream_lock (dtmfsrc, FALSE);
769 g_free (dtmfsrc->last_event);
770 dtmfsrc->last_event = NULL;
773 return GST_FLOW_WRONG_STATE;
778 gst_dtmf_src_unlock (GstBaseSrc *src) {
779 GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (src);
780 GstDTMFSrcEvent *event = NULL;
782 GST_DEBUG_OBJECT (dtmfsrc, "Called unlock");
784 GST_OBJECT_LOCK (dtmfsrc);
785 dtmfsrc->paused = TRUE;
786 if (dtmfsrc->clockid) {
787 gst_clock_id_unschedule (dtmfsrc->clockid);
789 GST_OBJECT_UNLOCK (dtmfsrc);
791 GST_DEBUG_OBJECT (dtmfsrc, "Pushing the PAUSE_TASK event on unlock request");
792 event = g_malloc (sizeof(GstDTMFSrcEvent));
793 event->event_type = DTMF_EVENT_TYPE_PAUSE_TASK;
794 g_async_queue_push (dtmfsrc->event_queue, event);
801 gst_dtmf_src_unlock_stop (GstBaseSrc *src) {
802 GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (src);
804 GST_DEBUG_OBJECT (dtmfsrc, "Unlock stopped");
806 GST_OBJECT_LOCK (dtmfsrc);
807 dtmfsrc->paused = FALSE;
808 GST_OBJECT_UNLOCK (dtmfsrc);
815 gst_dtmf_src_negotiate (GstBaseSrc * basesrc)
817 GstCaps *srccaps, *peercaps;
818 GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (basesrc);
819 gboolean ret = FALSE;
821 srccaps = gst_caps_new_simple ("audio/x-raw-int",
822 "width", G_TYPE_INT, 16,
823 "depth", G_TYPE_INT, 16,
824 "endianness", G_TYPE_INT, G_BYTE_ORDER,
825 "signed", G_TYPE_BOOLEAN, TRUE,
826 "channels", G_TYPE_INT, 1,
829 peercaps = gst_pad_peer_get_caps (GST_BASE_SRC_PAD (basesrc));
831 if (peercaps == NULL) {
832 /* no peer caps, just add the other properties */
833 gst_caps_set_simple (srccaps,
834 "rate", G_TYPE_INT, dtmfsrc->sample_rate,
839 GstCaps *temp = NULL;
841 g_debug ("HAS PEERCAPS %s", gst_caps_to_string (peercaps));
843 /* peer provides caps we can use to fixate, intersect. This always returns a
845 temp = gst_caps_intersect (srccaps, peercaps);
846 gst_caps_unref (srccaps);
847 gst_caps_unref (peercaps);
850 GST_DEBUG_OBJECT (dtmfsrc, "Could not get intersection with peer caps");
854 if (gst_caps_is_empty (temp)) {
855 GST_DEBUG_OBJECT (dtmfsrc, "Intersection with peer caps is empty");
856 gst_caps_unref (temp);
860 /* now fixate, start by taking the first caps */
861 gst_caps_truncate (temp);
864 /* get first structure */
865 s = gst_caps_get_structure (srccaps, 0);
867 if (gst_structure_get_int (s, "rate", &sample_rate))
869 dtmfsrc->sample_rate = sample_rate;
870 GST_LOG_OBJECT (dtmfsrc, "using rate from caps %d",
871 dtmfsrc->sample_rate);
873 GST_LOG_OBJECT (dtmfsrc, "using existing rate %d",
874 dtmfsrc->sample_rate);
876 gst_structure_set (s, "rate", G_TYPE_INT, dtmfsrc->sample_rate,
880 ret = gst_pad_set_caps (GST_BASE_SRC_PAD (basesrc), srccaps);
882 g_warning ("negotiated %s", gst_caps_to_string (srccaps));
886 gst_caps_unref (srccaps);
891 static GstStateChangeReturn
892 gst_dtmf_src_change_state (GstElement * element, GstStateChange transition)
895 GstStateChangeReturn result;
896 gboolean no_preroll = FALSE;
897 GstDTMFSrcEvent *event = NULL;
899 dtmfsrc = GST_DTMF_SRC (element);
901 switch (transition) {
902 case GST_STATE_CHANGE_READY_TO_PAUSED:
903 /* Flushing the event queue */
904 event = g_async_queue_try_pop (dtmfsrc->event_queue);
906 while (event != NULL) {
908 event = g_async_queue_try_pop (dtmfsrc->event_queue);
917 GST_ELEMENT_CLASS (parent_class)->change_state (element,
918 transition)) == GST_STATE_CHANGE_FAILURE)
921 switch (transition) {
922 case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
925 case GST_STATE_CHANGE_PAUSED_TO_READY:
926 GST_DEBUG_OBJECT (dtmfsrc, "Flushing event queue");
927 /* Flushing the event queue */
928 event = g_async_queue_try_pop (dtmfsrc->event_queue);
930 while (event != NULL) {
932 event = g_async_queue_try_pop (dtmfsrc->event_queue);
940 if (no_preroll && result == GST_STATE_CHANGE_SUCCESS)
941 result = GST_STATE_CHANGE_NO_PREROLL;
948 GST_ERROR_OBJECT (dtmfsrc, "parent failed state change");
954 gst_dtmf_src_plugin_init (GstPlugin * plugin)
956 return gst_element_register (plugin, "dtmfsrc",
957 GST_RANK_NONE, GST_TYPE_DTMF_SRC);