mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-05 16:06:43 +00:00
953 lines
27 KiB
C
953 lines
27 KiB
C
/* GStreamer DTMF source
|
|
*
|
|
* gstdtmfsrc.c:
|
|
*
|
|
* Copyright (C) <2007> Collabora.
|
|
* Contact: Youness Alaoui <youness.alaoui@collabora.co.uk>
|
|
* Copyright (C) <2007> Nokia Corporation.
|
|
* Contact: Zeeshan Ali <zeeshan.ali@nokia.com>
|
|
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
|
|
* 2000,2005 Wim Taymans <wim@fluendo.com>
|
|
*
|
|
* 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., 51 Franklin St, Fifth Floor,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
/**
|
|
* SECTION:element-dtmfsrc
|
|
* @title: 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:
|
|
*
|
|
* * `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 specified
|
|
* 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 <stdlib.h>
|
|
#include <string.h>
|
|
#include <math.h>
|
|
|
|
#include <glib.h>
|
|
|
|
#include "gstdtmfcommon.h"
|
|
|
|
#include "gstdtmfsrc.h"
|
|
|
|
#include <gst/audio/audio.h>
|
|
|
|
#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, "
|
|
"layout = (string)interleaved")
|
|
);
|
|
|
|
#define parent_class gst_dtmf_src_parent_class
|
|
G_DEFINE_TYPE (GstDTMFSrc, gst_dtmf_src, GST_TYPE_BASE_SRC);
|
|
GST_ELEMENT_REGISTER_DEFINE (dtmfsrc, "dtmfsrc", GST_RANK_NONE,
|
|
GST_TYPE_DTMF_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 gboolean gst_dtmf_src_query (GstBaseSrc * basesrc, GstQuery * query);
|
|
|
|
|
|
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_static_pad_template (gstelement_class,
|
|
&gst_dtmf_src_template);
|
|
|
|
gst_element_class_set_static_metadata (gstelement_class,
|
|
"DTMF tone generator", "Source/Audio", "Generates DTMF tones",
|
|
"Youness Alaoui <youness.alaoui@collabora.co.uk>");
|
|
|
|
|
|
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);
|
|
gstbasesrc_class->query = GST_DEBUG_FUNCPTR (gst_dtmf_src_query);
|
|
}
|
|
|
|
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, 1, 0, 0, };
|
|
|
|
/* 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 gboolean
|
|
gst_dtmf_src_query (GstBaseSrc * basesrc, GstQuery * query)
|
|
{
|
|
GstDTMFSrc *dtmfsrc = GST_DTMF_SRC (basesrc);
|
|
gboolean res = FALSE;
|
|
|
|
switch (GST_QUERY_TYPE (query)) {
|
|
case GST_QUERY_LATENCY:
|
|
{
|
|
GstClockTime latency;
|
|
|
|
latency = dtmfsrc->interval * GST_MSECOND;
|
|
gst_query_set_latency (query, gst_base_src_is_live (basesrc), latency,
|
|
GST_CLOCK_TIME_NONE);
|
|
GST_DEBUG_OBJECT (dtmfsrc, "Reporting latency of %" GST_TIME_FORMAT,
|
|
GST_TIME_ARGS (latency));
|
|
res = TRUE;
|
|
}
|
|
break;
|
|
default:
|
|
res = GST_BASE_SRC_CLASS (parent_class)->query (basesrc, query);
|
|
break;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|