<?xml version="1.0" ?>
<node name="/Call_Content_Interface_DTMF" xmlns:tp="http://telepathy.freedesktop.org/wiki/DbusSpec#extensions-v0">
<tp:copyright>Copyright © 2005-2010 Collabora Limited</tp:copyright>
<tp:copyright>Copyright © 2005-2010 Nokia Corporation</tp:copyright>
<tp:copyright>Copyright © 2006 INdT</tp:copyright>
<tp:license xmlns="http://www.w3.org/1999/xhtml">
<p>This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.</p>
<p>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
Lesser General Public License for more details.</p>
<p>You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.</p>
</tp:license>
<interface name="org.freedesktop.Telepathy.Call1.Content.Interface.DTMF">
<tp:requires interface="org.freedesktop.Telepathy.Call1.Content"/>
<tp:added version="0.25.2">(as stable API)</tp:added>
<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
An interface that gives audio Contents the ability to send DTMF events
which have been established using the Call1 channel
type. The event codes used are in common with those defined in <a
href="http://www.rfc-editor.org/rfc/rfc4733.txt">RFC4733</a>, and are
listed in the <tp:type>DTMF_Event</tp:type> enumeration.
</tp:docstring>
<method name="StartTone" tp:name-for-bindings="Start_Tone">
<arg direction="in" name="Event" type="y" tp:type="DTMF_Event">
<tp:docstring>A numeric event code from the DTMF_Event enum.</tp:docstring>
</arg>
<tp:docstring>
<p>Start sending a DTMF tone to all eligible streams in the channel.
Where possible, the tone will continue until
<tp:member-ref>StopTone</tp:member-ref> is called. On certain protocols,
it may only be possible to send events with a predetermined length. In
this case, the implementation MAY emit a fixed-length tone, and the
StopTone method call SHOULD return NotAvailable.</p>
<tp:rationale>
The client may wish to control the exact duration and timing of the
tones sent as a result of user's interaction with the dialpad, thus
starting and stopping the tone sending explicitly.
</tp:rationale>
<p>Tone overlaping or queueing is not supported, so this method can only
be called if no DTMF tones are already being played.</p>
</tp:docstring>
<tp:possible-errors>
<tp:error name="org.freedesktop.Telepathy.Error.NetworkError" />
<tp:error name="org.freedesktop.Telepathy.Error.InvalidArgument">
<tp:docstring>
The event id was invalid.
</tp:docstring>
</tp:error>
<tp:error name="org.freedesktop.Telepathy.Error.ServiceBusy">
<tp:docstring>
DTMF tones are already being played.
</tp:docstring>
</tp:error>
</tp:possible-errors>
</method>
<method name="StopTone" tp:name-for-bindings="Stop_Tone">
<tp:docstring>
Stop sending any DTMF tones which have been started using the
<tp:member-ref>StartTone</tp:member-ref> or
<tp:member-ref>MultipleTones</tp:member-ref> methods.
If there is no current tone, this method will do nothing.
If MultipleTones was used, the client should not assume the
sending has stopped immediately; instead, the client should wait
for the StoppedTones signal.
<tp:rationale>
On some protocols it might be impossible to cancel queued tones
immediately.
</tp:rationale>
</tp:docstring>
<tp:possible-errors>
<tp:error name="org.freedesktop.Telepathy.Error.NetworkError" />
<tp:error name="org.freedesktop.Telepathy.Error.NotAvailable">
<tp:docstring>
Continuous tones are not supported by this stream. Deprecated,
since stream IDs are ignored.
</tp:docstring>
</tp:error>
</tp:possible-errors>
</method>
<method name="MultipleTones" tp:name-for-bindings="Multiple_Tones">
<arg direction="in" name="Tones" type="s">
<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
<p>A string representation of one or more DTMF
events. Implementations of this method MUST support all of the
following characters in this string:</p>
<ul>
<li>the digits 0-9, letters A-D and a-d, and symbols '*' and '#'
correspond to the members of <tp:type>DTMF_Event</tp:type></li>
<li>any of 'p', 'P', 'x', 'X' or ',' (comma) results in an
implementation-defined pause, typically for 3 seconds</li>
<li>'w' or 'W' waits for the user to continue, by stopping
interpretation of the string, and if there is more to be played,
emitting the <tp:member-ref>TonesDeferred</tp:member-ref> signal
with the rest of the string as its argument: see that signal
for details</li>
</ul>
</tp:docstring>
</arg>
<tp:docstring>
<p>Send multiple DTMF events to all eligible streams in the channel.
Each tone will be played for an implementation-defined number of
milliseconds (typically 250ms), followed by a gap before the next tone
is played (typically 100ms). The
duration and gap are defined by the protocol or connection manager.</p>
<tp:rationale>
<p>In cases where the client knows in advance the tone sequence it
wants to send, it's easier to use this method than manually start
and stop each tone in the sequence.</p>
<p>The tone and gap lengths may need to vary for interoperability,
according to the protocol and other implementations' ability to
recognise tones. At the time of writing, GStreamer uses a
minimum of 250ms tones and 100ms gaps when playing in-band DTMF
in the normal audio stream, or 70ms tones and 50ms gaps when
encoding DTMF as <code>audio/telephone-event</code>.</p>
</tp:rationale>
<p>Tone overlaping or queueing is not supported, so this method can only
be called if no DTMF tones are already being played.</p>
</tp:docstring>
<tp:possible-errors>
<tp:error name="org.freedesktop.Telepathy.Error.NetworkError" />
<tp:error name="org.freedesktop.Telepathy.Error.InvalidArgument">
<tp:docstring>
The supplied Tones string was invalid.
</tp:docstring>
</tp:error>
<tp:error name="org.freedesktop.Telepathy.Error.ServiceBusy">
<tp:docstring>
DTMF tones are already being played.
</tp:docstring>
</tp:error>
</tp:possible-errors>
</method>
<property name="CurrentlySendingTones"
tp:name-for-bindings="Currently_Sending_Tones" type="b" access="read">
<tp:docstring>
Indicates whether there are DTMF tones currently being sent in the
channel. If so, the client should wait for
<tp:member-ref>StoppedTones</tp:member-ref> signal before trying to
send more tones.
</tp:docstring>
</property>
<property name="DeferredTones" tp:name-for-bindings="Deferred_Tones"
type="s" access="read">
<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
<p>The tones waiting for the user to continue, if any.</p>
<p>When this property is set to a non-empty value,
<tp:member-ref>TonesDeferred</tp:member-ref> is emitted.
When any tones are played (i.e. whenever
<tp:member-ref>SendingTones</tp:member-ref> is emitted),
this property is reset to the empty string.</p>
</tp:docstring>
</property>
<signal name="TonesDeferred" tp:name-for-bindings="Tones_Deferred">
<tp:added version="0.21.3" />
<arg name="Tones" type="s">
<tp:docstring>The new non-empty value of
<tp:member-ref>DeferredTones</tp:member-ref>.</tp:docstring>
</arg>
<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
<p>Emitted when 'w' or 'W', indicating "wait for the user to continue",
is encountered while playing a DTMF string queued by
<tp:member-ref>MultipleTones</tp:member-ref>. Any queued DTMF events
after the 'w', which have not yet been played, are placed in the
<tp:member-ref>DeferredTones</tp:member-ref> property and copied
into this signal's argument.</p>
<p>When the channel handler is ready to continue, it MAY pass the
value of <tp:member-ref>DeferredTones</tp:member-ref> to
<tp:member-ref>MultipleTones</tp:member-ref>, to resume sending.
Alternatively, it MAY ignore the deferred tones, or even play
different tones instead. Any deferred tones are discarded the next
time a tone is played.</p>
<p>This signal SHOULD NOT be emitted if there is nothing left to play,
i.e. if the 'w' was the last character in the DTMF string.</p>
</tp:docstring>
</signal>
<signal name="SendingTones" tp:name-for-bindings="Sending_Tones">
<arg name="Tones" type="s">
<tp:docstring>DTMF string (one or more events) that is to be played.
</tp:docstring>
</arg>
<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
<p>DTMF tone(s)are being sent to all eligible streams in the channel.
The signal is provided to indicating the fact that the streams are
currently being used to send one or more DTMF tones, so any other
media input is not getting through to the audio stream. It also
serves as a cue for the
<tp:member-ref>StopTone</tp:member-ref> method.</p>
</tp:docstring>
</signal>
<signal name="StoppedTones" tp:name-for-bindings="Stopped_Tones">
<arg name="Cancelled" type="b">
<tp:docstring>True if the DTMF tones were actively cancelled via
<tp:member-ref>StopTone</tp:member-ref>.</tp:docstring>
</arg>
<tp:docstring xmlns="http://www.w3.org/1999/xhtml">
<p>DTMF tones have finished playing on streams in this channel.</p>
</tp:docstring>
</signal>
</interface>
</node>
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