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DTMF dialstring interpreter

DTMF dialstring interpreter — Converts a dialstring into a timed sequence of events

Synopsis

#include <telepathy-glib/telepathy-glib.h>

struct              TpDTMFPlayer;
TpDTMFPlayer *      tp_dtmf_player_new                  (void);
gboolean            tp_dtmf_player_play                 (TpDTMFPlayer *self,
                                                         const gchar *tones,
                                                         guint tone_ms,
                                                         guint gap_ms,
                                                         guint pause_ms,
                                                         GError **error);
void                tp_dtmf_player_cancel               (TpDTMFPlayer *self);
gboolean            tp_dtmf_player_is_active            (TpDTMFPlayer *self);

Object Hierarchy

  GObject
   +----TpDTMFPlayer

Description

Telepathy offers two APIs for DTMF events: user interfaces can either call the StartTone and StopTone methods (appropriate if the user is pressing hardware or on-screen buttons in real time), or call MultipleTones or set InitialTones (appropriate if a stored dialstring is in use).

TpDTMFPlayer provides common code for connection managers that need to turn MultipleTones or InitialTones received from a UI into a sequence of start and stop events for the underlying protocol.

Details

struct TpDTMFPlayer

struct TpDTMFPlayer;

An object to convert a string of characters representing DTMF tones into timed start and stop events.

Typically, a connection manager should instantiate one TpDTMFPlayer for each StreamedMedia or Call channel that supports DTMF.

The "started-tone" and "stopped-tone" signals should be connected to some way to play a tone, either directly or by emitting signals from the StreamHandler interface.

The "tones-deferred" signal should trigger emission of TonesDeferred.

The "finished" signal indicates that the current sequence of tones has finished.

Since 0.13.3


tp_dtmf_player_new ()

TpDTMFPlayer *      tp_dtmf_player_new                  (void);

Returns :

a new DTMF interpreter. [transfer full]

Since 0.13.3


tp_dtmf_player_play ()

gboolean            tp_dtmf_player_play                 (TpDTMFPlayer *self,
                                                         const gchar *tones,
                                                         guint tone_ms,
                                                         guint gap_ms,
                                                         guint pause_ms,
                                                         GError **error);

Start to play a sequence of tones, by emitting the "started-tone" and "stopped-tone" signals.

If tp_dtmf_player_is_active() would return TRUE, this method raises TP_ERROR_SERVICE_BUSY and does not play anything, and the previous sequence continues to play.

The recognised characters are 0-9, A-D, # and * (which play the corresponding DTMF event), P, X and comma (which each pause for pause_ms milliseconds), and W (which stops interpretation of the string and emits "tones-deferred" with the rest of the string). The corresponding lower-case letters are also allowed. If tones contains any other characters, this method raises TP_ERROR_INVALID_ARGUMENT and does not play anything.

self :

a DTMF interpreter

tones :

a sequence of tones or other events

tone_ms :

length of a tone (0-9, A-D, # or *) in milliseconds, which must be positive; typically 250

gap_ms :

length of the gap between two tones, which must be positive; typically 100

pause_ms :

length of the pause produced by P, X or comma, which must be positive; typically 3000

error :

used to raise an error

Returns :

TRUE on success, FALSE (setting error) on failure

Since 0.13.3


tp_dtmf_player_cancel ()

void                tp_dtmf_player_cancel               (TpDTMFPlayer *self);

If tones were being played, stop the current tone (if any), stop playing subsequent tones, and emit "finished".

Otherwise, do nothing.

self :

a DTMF interpreter

Since 0.13.3


tp_dtmf_player_is_active ()

gboolean            tp_dtmf_player_is_active            (TpDTMFPlayer *self);

self :

a DTMF interpreter

Returns :

TRUE if a sequence of tones is currently playing

Since 0.13.3

Signal Details

The "finished" signal

void                user_function                      (TpDTMFPlayer *self,
                                                        gboolean      cancelled,
                                                        gpointer      user_data)      : Run Last

Emitted when playback stops, either because the end of the sequence was reached, tp_dtmf_player_cancel() was called, or a 'W' or 'w' character was encountered.

self :

the TpDTMFPlayer

cancelled :

TRUE if playback was cancelled with tp_dtmf_player_cancel()

user_data :

user data set when the signal handler was connected.

Since 0.13.3


The "started-tone" signal

void                user_function                      (TpDTMFPlayer *self,
                                                        guint         event,
                                                        gpointer      user_data)      : Run Last

Emitted at the beginning of each tone.

self :

the TpDTMFPlayer

event :

a G_TYPE_UINT representing the tone being played

user_data :

user data set when the signal handler was connected.

The "stopped-tone" signal

void                user_function                      (TpDTMFPlayer *self,
                                                        gpointer      user_data)      : Run Last

Emitted at the end of each tone.

self :

the TpDTMFPlayer

user_data :

user data set when the signal handler was connected.

Since 0.13.3


The "tones-deferred" signal

void                user_function                      (TpDTMFPlayer *self,
                                                        gchar        *tones,
                                                        gpointer      user_data)      : Run Last

Emitted just before "finished" if a 'W' or 'w' character is encountered before the end of a dial string. The connection manager is expected to wait for the user to confirm, then call tp_dtmf_player_play() again, using this signal's argument as the new dial string.

self :

the TpDTMFPlayer

tones :

the remaining tones, starting from just after the 'W' or 'w'

user_data :

user data set when the signal handler was connected.

Since 0.13.3

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