/* GStreamer DTMF source * * gstdtmfsrc.c: * * Copyright (C) <2007> Collabora. * Contact: Youness Alaoui * Copyright (C) <2007> Nokia Corporation. * Contact: Zeeshan Ali * Copyright (C) 1999,2000 Erik Walthinsen * 2000,2005 Wim Taymans * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /** * SECTION:element-dtmfsrc * @see_also: rtpdtmsrc, rtpdtmfmuxx * * The DTMFSrc element generates DTMF (ITU-T Q.23 Specification) tone packets on request * from application. The application communicates the beginning and end of a * DTMF event using custom upstream gstreamer events. To report a DTMF event, an * application must send an event of type GST_EVENT_CUSTOM_UPSTREAM, having a * structure of name "dtmf-event" with fields set according to the following * table: * * * * * * * * * * Name * GType * Possible values * Purpose * * * * * type * G_TYPE_INT * 0-1 * The application uses this field to specify which of the two methods * specified in RFC 2833 to use. The value should be 0 for tones and 1 for * named events. Tones are specified by their frequencies and events are specied * by their number. This element can only take events as input. Do not confuse * with "method" which specified the output. * * * * number * G_TYPE_INT * 0-15 * The event number. * * * volume * G_TYPE_INT * 0-36 * This field describes the power level of the tone, expressed in dBm0 * after dropping the sign. Power levels range from 0 to -63 dBm0. The range of * valid DTMF is from 0 to -36 dBm0. Can be omitted if start is set to FALSE. * * * * start * G_TYPE_BOOLEAN * True or False * Whether the event is starting or ending. * * * method * G_TYPE_INT * 2 * The method used for sending event, this element will react if this * field is absent or 2. * * * * * * * For example, the following code informs the pipeline (and in turn, the * DTMFSrc element inside the pipeline) about the start of a DTMF named * event '1' of volume -25 dBm0: * * * structure = gst_structure_new ("dtmf-event", * "type", G_TYPE_INT, 1, * "number", G_TYPE_INT, 1, * "volume", G_TYPE_INT, 25, * "start", G_TYPE_BOOLEAN, TRUE, NULL); * * event = gst_event_new_custom (GST_EVENT_CUSTOM_UPSTREAM, structure); * gst_element_send_event (pipeline, event); * * * When a DTMF tone actually starts or stop, a "dtmf-event-processed" * element #GstMessage with the same fields as the "dtmf-event" * #GstEvent that was used to request the event. Also, if any event * has not been processed when the element goes from the PAUSED to the * READY state, then a "dtmf-event-dropped" message is posted on the * #GstBus in the order that they were received. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include #include "gstdtmfcommon.h" #include "gstdtmfsrc.h" #include #define GST_TONE_DTMF_TYPE_EVENT 1 #define DEFAULT_PACKET_INTERVAL 50 /* ms */ #define MIN_PACKET_INTERVAL 10 /* ms */ #define MAX_PACKET_INTERVAL 50 /* ms */ #define DEFAULT_SAMPLE_RATE 8000 #define SAMPLE_SIZE 16 #define CHANNELS 1 #define MIN_DUTY_CYCLE (MIN_INTER_DIGIT_INTERVAL + MIN_PULSE_DURATION) typedef struct st_dtmf_key { const char *event_name; int event_encoding; float low_frequency; float high_frequency; } DTMF_KEY; static const DTMF_KEY DTMF_KEYS[] = { {"DTMF_KEY_EVENT_0", 0, 941, 1336}, {"DTMF_KEY_EVENT_1", 1, 697, 1209}, {"DTMF_KEY_EVENT_2", 2, 697, 1336}, {"DTMF_KEY_EVENT_3", 3, 697, 1477}, {"DTMF_KEY_EVENT_4", 4, 770, 1209}, {"DTMF_KEY_EVENT_5", 5, 770, 1336}, {"DTMF_KEY_EVENT_6", 6, 770, 1477}, {"DTMF_KEY_EVENT_7", 7, 852, 1209}, {"DTMF_KEY_EVENT_8", 8, 852, 1336}, {"DTMF_KEY_EVENT_9", 9, 852, 1477}, {"DTMF_KEY_EVENT_S", 10, 941, 1209}, {"DTMF_KEY_EVENT_P", 11, 941, 1477}, {"DTMF_KEY_EVENT_A", 12, 697, 1633}, {"DTMF_KEY_EVENT_B", 13, 770, 1633}, {"DTMF_KEY_EVENT_C", 14, 852, 1633}, {"DTMF_KEY_EVENT_D", 15, 941, 1633}, }; #define MAX_DTMF_EVENTS 16 enum { DTMF_KEY_EVENT_1 = 1, DTMF_KEY_EVENT_2 = 2, DTMF_KEY_EVENT_3 = 3, DTMF_KEY_EVENT_4 = 4, DTMF_KEY_EVENT_5 = 5, DTMF_KEY_EVENT_6 = 6, DTMF_KEY_EVENT_7 = 7, DTMF_KEY_EVENT_8 = 8, DTMF_KEY_EVENT_9 = 9, DTMF_KEY_EVENT_0 = 0, DTMF_KEY_EVENT_STAR = 10, DTMF_KEY_EVENT_POUND = 11, DTMF_KEY_EVENT_A = 12, DTMF_KEY_EVENT_B = 13, DTMF_KEY_EVENT_C = 14, DTMF_KEY_EVENT_D = 15, }; GST_DEBUG_CATEGORY_STATIC (gst_dtmf_src_debug); #define GST_CAT_DEFAULT gst_dtmf_src_debug enum { PROP_0, PROP_INTERVAL, }; static GstStaticPadTemplate gst_dtmf_src_template = GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS, GST_STATIC_CAPS ("audio/x-raw, " "format = (string) \"" GST_AUDIO_NE (S16) "\", " "rate = " GST_AUDIO_RATE_RANGE ", " "channels = (int) 1") ); #define parent_class gst_dtmf_src_parent_class G_DEFINE_TYPE (GstDTMFSrc, gst_dtmf_src, GST_TYPE_BASE_SRC); static void gst_dtmf_src_finalize (GObject * object); static void gst_dtmf_src_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_dtmf_src_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); static gboolean gst_dtmf_src_handle_event (GstBaseSrc * src, GstEvent * event); static gboolean gst_dtmf_src_send_event (GstElement * src, GstEvent * event); static GstStateChangeReturn gst_dtmf_src_change_state (GstElement * element, GstStateChange transition); static GstFlowReturn gst_dtmf_src_create (GstBaseSrc * basesrc, guint64 offset, guint length, GstBuffer ** buffer); static void gst_dtmf_src_add_start_event (GstDTMFSrc * dtmfsrc, gint event_number, gint event_volume); static void gst_dtmf_src_add_stop_event (GstDTMFSrc * dtmfsrc); static gboolean gst_dtmf_src_unlock (GstBaseSrc * src); static gboolean gst_dtmf_src_unlock_stop (GstBaseSrc * src); static gboolean gst_dtmf_src_negotiate (GstBaseSrc * basesrc); static void gst_dtmf_src_class_init (GstDTMFSrcClass * klass) { GObjectClass *gobject_class; GstBaseSrcClass *gstbasesrc_class; GstElementClass *gstelement_class; gobject_class = G_OBJECT_CLASS (klass); gstbasesrc_class = GST_BASE_SRC_CLASS (klass); gstelement_class = GST_ELEMENT_CLASS (klass); GST_DEBUG_CATEGORY_INIT (gst_dtmf_src_debug, "dtmfsrc", 0, "dtmfsrc element"); gst_element_class_add_pad_template (gstelement_class, gst_static_pad_template_get (&gst_dtmf_src_template)); gst_element_class_set_details_simple (gstelement_class, "DTMF tone generator", "Source/Audio", "Generates DTMF tones", "Youness Alaoui "); gobject_class->finalize = gst_dtmf_src_finalize; gobject_class->set_property = gst_dtmf_src_set_property; gobject_class->get_property = gst_dtmf_src_get_property; g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_INTERVAL, g_param_spec_uint ("interval", "Interval between tone packets", "Interval in ms between two tone packets", MIN_PACKET_INTERVAL, MAX_PACKET_INTERVAL, DEFAULT_PACKET_INTERVAL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_dtmf_src_change_state); gstelement_class->send_event = GST_DEBUG_FUNCPTR (gst_dtmf_src_send_event); gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_dtmf_src_unlock); gstbasesrc_class->unlock_stop = GST_DEBUG_FUNCPTR (gst_dtmf_src_unlock_stop); gstbasesrc_class->event = GST_DEBUG_FUNCPTR (gst_dtmf_src_handle_event); gstbasesrc_class->create = GST_DEBUG_FUNCPTR (gst_dtmf_src_create); gstbasesrc_class->negotiate = GST_DEBUG_FUNCPTR (gst_dtmf_src_negotiate); } static void event_free (GstDTMFSrcEvent * event) { if (event) g_slice_free (GstDTMFSrcEvent, event); } static void gst_dtmf_src_init (GstDTMFSrc * dtmfsrc) { /* we operate in time */ gst_base_src_set_format (GST_BASE_SRC (dtmfsrc), GST_FORMAT_TIME); gst_base_src_set_live (GST_BASE_SRC (dtmfsrc), TRUE); dtmfsrc->interval = DEFAULT_PACKET_INTERVAL; dtmfsrc->event_queue = g_async_queue_new_full ((GDestroyNotify) event_free); dtmfsrc->last_event = NULL; dtmfsrc->sample_rate = DEFAULT_SAMPLE_RATE; GST_DEBUG_OBJECT (dtmfsrc, "init done"); } static void gst_dtmf_src_finalize (GObject * object) { GstDTMFSrc *dtmfsrc; dtmfsrc = GST_DTMF_SRC (object); if (dtmfsrc->event_queue) { g_async_queue_unref (dtmfsrc->event_queue); dtmfsrc->event_queue = NULL; } G_OBJECT_CLASS (gst_dtmf_src_parent_class)->finalize (object); } static gboolean gst_dtmf_src_handle_dtmf_event (GstDTMFSrc * dtmfsrc, GstEvent * event) { const GstStructure *event_structure; GstStateChangeReturn sret; GstState state; gint event_type; gboolean start; gint method; GstClockTime last_stop; gint event_number; gint event_volume; gboolean correct_order; sret = gst_element_get_state (GST_ELEMENT (dtmfsrc), &state, NULL, 0); if (sret != GST_STATE_CHANGE_SUCCESS || state != GST_STATE_PLAYING) { GST_DEBUG_OBJECT (dtmfsrc, "dtmf-event, but not in PLAYING state"); goto failure; } event_structure = gst_event_get_structure (event); if (!gst_structure_get_int (event_structure, "type", &event_type) || !gst_structure_get_boolean (event_structure, "start", &start) || (start == TRUE && event_type != GST_TONE_DTMF_TYPE_EVENT)) goto failure; if (gst_structure_get_int (event_structure, "method", &method)) { if (method != 2) { goto failure; } } if (start) if (!gst_structure_get_int (event_structure, "number", &event_number) || !gst_structure_get_int (event_structure, "volume", &event_volume)) goto failure; GST_OBJECT_LOCK (dtmfsrc); if (gst_structure_get_clock_time (event_structure, "last-stop", &last_stop)) dtmfsrc->last_stop = last_stop; else dtmfsrc->last_stop = GST_CLOCK_TIME_NONE; correct_order = (start != dtmfsrc->last_event_was_start); dtmfsrc->last_event_was_start = start; GST_OBJECT_UNLOCK (dtmfsrc); if (!correct_order) goto failure; if (start) { GST_DEBUG_OBJECT (dtmfsrc, "Received start event %d with volume %d", event_number, event_volume); gst_dtmf_src_add_start_event (dtmfsrc, event_number, event_volume); } else { GST_DEBUG_OBJECT (dtmfsrc, "Received stop event"); gst_dtmf_src_add_stop_event (dtmfsrc); } return TRUE; failure: return FALSE; } static gboolean gst_dtmf_src_handle_event (GstBaseSrc * src, GstEvent * event) { GstDTMFSrc *dtmfsrc; gboolean result = FALSE; dtmfsrc = GST_DTMF_SRC (src); GST_LOG_OBJECT (dtmfsrc, "Received an %s event on the src pad", GST_EVENT_TYPE_NAME (event)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_CUSTOM_UPSTREAM: if (gst_event_has_name (event, "dtmf-event")) { result = gst_dtmf_src_handle_dtmf_event (dtmfsrc, event); break; } /* fall through */ default: result = GST_BASE_SRC_CLASS (parent_class)->event (src, event); break; } return result; } static gboolean gst_dtmf_src_send_event (GstElement * element, GstEvent * event) { GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (element); gboolean ret; GST_LOG_OBJECT (dtmfsrc, "Received an %s event via send_event", GST_EVENT_TYPE_NAME (event)); switch (GST_EVENT_TYPE (event)) { case GST_EVENT_CUSTOM_BOTH: case GST_EVENT_CUSTOM_BOTH_OOB: case GST_EVENT_CUSTOM_UPSTREAM: case GST_EVENT_CUSTOM_DOWNSTREAM: case GST_EVENT_CUSTOM_DOWNSTREAM_OOB: if (gst_event_has_name (event, "dtmf-event")) { ret = gst_dtmf_src_handle_dtmf_event (dtmfsrc, event); break; } /* fall through */ default: ret = GST_ELEMENT_CLASS (parent_class)->send_event (element, event); break; } return ret; } static void gst_dtmf_src_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstDTMFSrc *dtmfsrc; dtmfsrc = GST_DTMF_SRC (object); switch (prop_id) { case PROP_INTERVAL: dtmfsrc->interval = g_value_get_uint (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_dtmf_src_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstDTMFSrc *dtmfsrc; dtmfsrc = GST_DTMF_SRC (object); switch (prop_id) { case PROP_INTERVAL: g_value_set_uint (value, dtmfsrc->interval); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } } static void gst_dtmf_prepare_timestamps (GstDTMFSrc * dtmfsrc) { GstClockTime last_stop; GstClockTime timestamp; GST_OBJECT_LOCK (dtmfsrc); last_stop = dtmfsrc->last_stop; GST_OBJECT_UNLOCK (dtmfsrc); if (GST_CLOCK_TIME_IS_VALID (last_stop)) { timestamp = last_stop; } else { GstClock *clock; /* If there is no valid start time, lets use now as the start time */ clock = gst_element_get_clock (GST_ELEMENT (dtmfsrc)); if (clock != NULL) { timestamp = gst_clock_get_time (clock) - gst_element_get_base_time (GST_ELEMENT (dtmfsrc)); gst_object_unref (clock); } else { gchar *dtmf_name = gst_element_get_name (dtmfsrc); GST_ERROR_OBJECT (dtmfsrc, "No clock set for element %s", dtmf_name); dtmfsrc->timestamp = GST_CLOCK_TIME_NONE; g_free (dtmf_name); return; } } /* Make sure the timestamp always goes forward */ if (timestamp > dtmfsrc->timestamp) dtmfsrc->timestamp = timestamp; } static void gst_dtmf_src_add_start_event (GstDTMFSrc * dtmfsrc, gint event_number, gint event_volume) { GstDTMFSrcEvent *event = g_slice_new0 (GstDTMFSrcEvent); event->event_type = DTMF_EVENT_TYPE_START; event->sample = 0; event->event_number = CLAMP (event_number, MIN_EVENT, MAX_EVENT); event->volume = CLAMP (event_volume, MIN_VOLUME, MAX_VOLUME); g_async_queue_push (dtmfsrc->event_queue, event); } static void gst_dtmf_src_add_stop_event (GstDTMFSrc * dtmfsrc) { GstDTMFSrcEvent *event = g_slice_new0 (GstDTMFSrcEvent); event->event_type = DTMF_EVENT_TYPE_STOP; event->sample = 0; event->event_number = 0; event->volume = 0; g_async_queue_push (dtmfsrc->event_queue, event); } static GstBuffer * gst_dtmf_src_generate_silence (float duration, gint sample_rate) { gint buf_size; /* Create a buffer with data set to 0 */ buf_size = ((duration / 1000) * sample_rate * SAMPLE_SIZE * CHANNELS) / 8; return gst_buffer_new_wrapped (g_malloc0 (buf_size), buf_size); } static GstBuffer * gst_dtmf_src_generate_tone (GstDTMFSrcEvent * event, DTMF_KEY key, float duration, gint sample_rate) { GstBuffer *buffer; GstMapInfo map; gint16 *p; gint tone_size; double i = 0; double amplitude, f1, f2; double volume_factor; static GstAllocationParams params = { 0, 0, 0, 1, }; /* Create a buffer for the tone */ tone_size = ((duration / 1000) * sample_rate * SAMPLE_SIZE * CHANNELS) / 8; buffer = gst_buffer_new_allocate (NULL, tone_size, ¶ms); gst_buffer_map (buffer, &map, GST_MAP_READWRITE); p = (gint16 *) map.data; volume_factor = pow (10, (-event->volume) / 20); /* * For each sample point we calculate 'x' as the * the amplitude value. */ for (i = 0; i < (tone_size / (SAMPLE_SIZE / 8)); i++) { /* * We add the fundamental frequencies together. */ f1 = sin (2 * M_PI * key.low_frequency * (event->sample / sample_rate)); f2 = sin (2 * M_PI * key.high_frequency * (event->sample / sample_rate)); amplitude = (f1 + f2) / 2; /* Adjust the volume */ amplitude *= volume_factor; /* Make the [-1:1] interval into a [-32767:32767] interval */ amplitude *= 32767; /* Store it in the data buffer */ *(p++) = (gint16) amplitude; (event->sample)++; } gst_buffer_unmap (buffer, &map); return buffer; } static GstBuffer * gst_dtmf_src_create_next_tone_packet (GstDTMFSrc * dtmfsrc, GstDTMFSrcEvent * event) { GstBuffer *buf = NULL; gboolean send_silence = FALSE; GST_LOG_OBJECT (dtmfsrc, "Creating buffer for tone %s", DTMF_KEYS[event->event_number].event_name); if (event->packet_count * dtmfsrc->interval < MIN_INTER_DIGIT_INTERVAL) { send_silence = TRUE; } if (send_silence) { GST_LOG_OBJECT (dtmfsrc, "Generating silence"); buf = gst_dtmf_src_generate_silence (dtmfsrc->interval, dtmfsrc->sample_rate); } else { GST_LOG_OBJECT (dtmfsrc, "Generating tone"); buf = gst_dtmf_src_generate_tone (event, DTMF_KEYS[event->event_number], dtmfsrc->interval, dtmfsrc->sample_rate); } event->packet_count++; /* timestamp and duration of GstBuffer */ GST_BUFFER_DURATION (buf) = dtmfsrc->interval * GST_MSECOND; GST_BUFFER_TIMESTAMP (buf) = dtmfsrc->timestamp; GST_LOG_OBJECT (dtmfsrc, "Creating new buffer with event %u duration " " gst: %" GST_TIME_FORMAT " at %" GST_TIME_FORMAT, event->event_number, GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf))); dtmfsrc->timestamp += GST_BUFFER_DURATION (buf); return buf; } static void gst_dtmf_src_post_message (GstDTMFSrc * dtmfsrc, const gchar * message_name, GstDTMFSrcEvent * event) { GstStructure *s = NULL; switch (event->event_type) { case DTMF_EVENT_TYPE_START: s = gst_structure_new (message_name, "type", G_TYPE_INT, 1, "method", G_TYPE_INT, 2, "start", G_TYPE_BOOLEAN, TRUE, "number", G_TYPE_INT, event->event_number, "volume", G_TYPE_INT, event->volume, NULL); break; case DTMF_EVENT_TYPE_STOP: s = gst_structure_new (message_name, "type", G_TYPE_INT, 1, "method", G_TYPE_INT, 2, "start", G_TYPE_BOOLEAN, FALSE, NULL); break; case DTMF_EVENT_TYPE_PAUSE_TASK: return; } if (s) gst_element_post_message (GST_ELEMENT (dtmfsrc), gst_message_new_element (GST_OBJECT (dtmfsrc), s)); } static GstFlowReturn gst_dtmf_src_create (GstBaseSrc * basesrc, guint64 offset, guint length, GstBuffer ** buffer) { GstBuffer *buf = NULL; GstDTMFSrcEvent *event; GstDTMFSrc *dtmfsrc; GstClock *clock; GstClockID *clockid; GstClockReturn clockret; dtmfsrc = GST_DTMF_SRC (basesrc); do { if (dtmfsrc->last_event == NULL) { GST_DEBUG_OBJECT (dtmfsrc, "popping"); event = g_async_queue_pop (dtmfsrc->event_queue); GST_DEBUG_OBJECT (dtmfsrc, "popped %d", event->event_type); switch (event->event_type) { case DTMF_EVENT_TYPE_STOP: GST_WARNING_OBJECT (dtmfsrc, "Received a DTMF stop event when already stopped"); gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-dropped", event); break; case DTMF_EVENT_TYPE_START: gst_dtmf_prepare_timestamps (dtmfsrc); event->packet_count = 0; dtmfsrc->last_event = event; event = NULL; gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-processed", dtmfsrc->last_event); break; case DTMF_EVENT_TYPE_PAUSE_TASK: /* * We're pushing it back because it has to stay in there until * the task is really paused (and the queue will then be flushed) */ GST_DEBUG_OBJECT (dtmfsrc, "pushing pause_task..."); GST_OBJECT_LOCK (dtmfsrc); if (dtmfsrc->paused) { g_async_queue_push (dtmfsrc->event_queue, event); goto paused_locked; } GST_OBJECT_UNLOCK (dtmfsrc); break; } if (event) g_slice_free (GstDTMFSrcEvent, event); } else if (dtmfsrc->last_event->packet_count * dtmfsrc->interval >= MIN_DUTY_CYCLE) { event = g_async_queue_try_pop (dtmfsrc->event_queue); if (event != NULL) { switch (event->event_type) { case DTMF_EVENT_TYPE_START: GST_WARNING_OBJECT (dtmfsrc, "Received two consecutive DTMF start events"); gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-dropped", event); break; case DTMF_EVENT_TYPE_STOP: g_slice_free (GstDTMFSrcEvent, dtmfsrc->last_event); dtmfsrc->last_event = NULL; gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-processed", event); break; case DTMF_EVENT_TYPE_PAUSE_TASK: /* * We're pushing it back because it has to stay in there until * the task is really paused (and the queue will then be flushed) */ GST_DEBUG_OBJECT (dtmfsrc, "pushing pause_task..."); GST_OBJECT_LOCK (dtmfsrc); if (dtmfsrc->paused) { g_async_queue_push (dtmfsrc->event_queue, event); goto paused_locked; } GST_OBJECT_UNLOCK (dtmfsrc); break; } g_slice_free (GstDTMFSrcEvent, event); } } } while (dtmfsrc->last_event == NULL); GST_LOG_OBJECT (dtmfsrc, "end event check, now wait for the proper time"); clock = gst_element_get_clock (GST_ELEMENT (basesrc)); clockid = gst_clock_new_single_shot_id (clock, dtmfsrc->timestamp + gst_element_get_base_time (GST_ELEMENT (dtmfsrc))); gst_object_unref (clock); GST_OBJECT_LOCK (dtmfsrc); if (!dtmfsrc->paused) { dtmfsrc->clockid = clockid; GST_OBJECT_UNLOCK (dtmfsrc); clockret = gst_clock_id_wait (clockid, NULL); GST_OBJECT_LOCK (dtmfsrc); if (dtmfsrc->paused) clockret = GST_CLOCK_UNSCHEDULED; } else { clockret = GST_CLOCK_UNSCHEDULED; } gst_clock_id_unref (clockid); dtmfsrc->clockid = NULL; GST_OBJECT_UNLOCK (dtmfsrc); if (clockret == GST_CLOCK_UNSCHEDULED) { goto paused; } buf = gst_dtmf_src_create_next_tone_packet (dtmfsrc, dtmfsrc->last_event); GST_LOG_OBJECT (dtmfsrc, "Created buffer of size %" G_GSIZE_FORMAT, gst_buffer_get_size (buf)); *buffer = buf; return GST_FLOW_OK; paused_locked: GST_OBJECT_UNLOCK (dtmfsrc); paused: if (dtmfsrc->last_event) { GST_DEBUG_OBJECT (dtmfsrc, "Stopping current event"); /* Don't forget to release the stream lock */ g_slice_free (GstDTMFSrcEvent, dtmfsrc->last_event); dtmfsrc->last_event = NULL; } return GST_FLOW_FLUSHING; } static gboolean gst_dtmf_src_unlock (GstBaseSrc * src) { GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (src); GstDTMFSrcEvent *event = NULL; GST_DEBUG_OBJECT (dtmfsrc, "Called unlock"); GST_OBJECT_LOCK (dtmfsrc); dtmfsrc->paused = TRUE; if (dtmfsrc->clockid) { gst_clock_id_unschedule (dtmfsrc->clockid); } GST_OBJECT_UNLOCK (dtmfsrc); GST_DEBUG_OBJECT (dtmfsrc, "Pushing the PAUSE_TASK event on unlock request"); event = g_slice_new0 (GstDTMFSrcEvent); event->event_type = DTMF_EVENT_TYPE_PAUSE_TASK; g_async_queue_push (dtmfsrc->event_queue, event); return TRUE; } static gboolean gst_dtmf_src_unlock_stop (GstBaseSrc * src) { GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (src); GST_DEBUG_OBJECT (dtmfsrc, "Unlock stopped"); GST_OBJECT_LOCK (dtmfsrc); dtmfsrc->paused = FALSE; GST_OBJECT_UNLOCK (dtmfsrc); return TRUE; } static gboolean gst_dtmf_src_negotiate (GstBaseSrc * basesrc) { GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (basesrc); GstCaps *caps; GstStructure *s; gboolean ret; caps = gst_pad_get_allowed_caps (GST_BASE_SRC_PAD (basesrc)); if (!caps) caps = gst_pad_get_pad_template_caps (GST_BASE_SRC_PAD (basesrc)); if (gst_caps_is_empty (caps)) { gst_caps_unref (caps); return FALSE; } caps = gst_caps_truncate (caps); caps = gst_caps_make_writable (caps); s = gst_caps_get_structure (caps, 0); gst_structure_fixate_field_nearest_int (s, "rate", DEFAULT_SAMPLE_RATE); if (!gst_structure_get_int (s, "rate", &dtmfsrc->sample_rate)) { GST_ERROR_OBJECT (dtmfsrc, "Could not get rate"); gst_caps_unref (caps); return FALSE; } ret = gst_pad_set_caps (GST_BASE_SRC_PAD (basesrc), caps); gst_caps_unref (caps); return ret; } static GstStateChangeReturn gst_dtmf_src_change_state (GstElement * element, GstStateChange transition) { GstDTMFSrc *dtmfsrc; GstStateChangeReturn result; gboolean no_preroll = FALSE; GstDTMFSrcEvent *event = NULL; dtmfsrc = GST_DTMF_SRC (element); switch (transition) { case GST_STATE_CHANGE_READY_TO_PAUSED: /* Flushing the event queue */ event = g_async_queue_try_pop (dtmfsrc->event_queue); while (event != NULL) { gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-dropped", event); g_slice_free (GstDTMFSrcEvent, event); event = g_async_queue_try_pop (dtmfsrc->event_queue); } dtmfsrc->last_event_was_start = FALSE; dtmfsrc->timestamp = 0; no_preroll = TRUE; break; default: break; } if ((result = GST_ELEMENT_CLASS (gst_dtmf_src_parent_class)->change_state (element, transition)) == GST_STATE_CHANGE_FAILURE) goto failure; switch (transition) { case GST_STATE_CHANGE_PLAYING_TO_PAUSED: no_preroll = TRUE; break; case GST_STATE_CHANGE_PAUSED_TO_READY: GST_DEBUG_OBJECT (dtmfsrc, "Flushing event queue"); /* Flushing the event queue */ event = g_async_queue_try_pop (dtmfsrc->event_queue); while (event != NULL) { gst_dtmf_src_post_message (dtmfsrc, "dtmf-event-dropped", event); g_slice_free (GstDTMFSrcEvent, event); event = g_async_queue_try_pop (dtmfsrc->event_queue); } dtmfsrc->last_event_was_start = FALSE; break; default: break; } if (no_preroll && result == GST_STATE_CHANGE_SUCCESS) result = GST_STATE_CHANGE_NO_PREROLL; return result; /* ERRORS */ failure: { GST_ERROR_OBJECT (dtmfsrc, "parent failed state change"); return result; } } gboolean gst_dtmf_src_plugin_init (GstPlugin * plugin) { return gst_element_register (plugin, "dtmfsrc", GST_RANK_NONE, GST_TYPE_DTMF_SRC); }