<?xml version="1.0" ?>
<node name="/Channel_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.Channel.Interface.DTMF">
    <tp:xor-requires>
      <tp:requires interface="org.freedesktop.Telepathy.Channel.Type.StreamedMedia"/>
      <tp:requires interface="org.freedesktop.Telepathy.Channel.Type.Call1"/>
    </tp:xor-requires>

    <tp:changed version="0.25.2">The only part of this spec that should
    be used with a Call1 channel is the "InitialTones" property.
    </tp:changed>

    <tp:changed version="0.19.6">The <tp:type>Stream_ID</tp:type>s in this
      interface can now be ignored by CMs.
    </tp:changed>

    <tp:docstring xmlns="http://www.w3.org/1999/xhtml">
      An interface that gives a Channel the ability to send DTMF events over
      audio streams which have been established using the StreamedMedia 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">
      <tp:changed version="0.19.6">The <var>Stream_ID</var> parameter became
        vestigial.</tp:changed>
      <arg direction="in" name="Stream_ID" type="u" tp:type="Stream_ID">
        <tp:docstring>A stream ID as defined in the StreamedMedia channel
        type. This argument is included for backwards compatibility and MUST
        be ignored by the implementations - the tone SHOULD be sent to all
        eligible streams in the channel.</tp:docstring>
      </arg>
      <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 given stream ID was invalid. Deprecated, since stream IDs
            are ignored.
          </tp:docstring>
        </tp:error>
        <tp:error name="org.freedesktop.Telepathy.Error.NotAvailable">
          <tp:docstring>
            There are no eligible audio streams.
          </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:changed version="0.19.6">The <var>Stream_ID</var> parameter became
        vestigial.</tp:changed>
      <arg direction="in" name="Stream_ID" type="u" tp:type="Stream_ID">
        <tp:docstring>A stream ID as defined in the StreamedMedia channel
        type. This argument is included for backwards compatibility and MUST
        be ignored by the implementations - the sending SHOULD be stoped in
        all eligible streams in the channel.</tp:docstring>
      </arg>

      <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.InvalidArgument">
          <tp:docstring>
            The given stream ID was invalid. Deprecated, since stream IDs
            are ignored.
          </tp:docstring>
        </tp:error>
        <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">
      <tp:added version="0.19.6" />
      <tp:changed version="0.21.3">The characters [pPxXwW,] must
        also be supported.</tp:changed>
      <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.NotAvailable">
          <tp:docstring>
            There are no eligible audio streams.
          </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:added version="0.19.6" />
      <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="InitialTones" tp:name-for-bindings="Initial_Tones"
        type="s" access="read" tp:immutable="yes" tp:requestable="yes">
      <tp:added version="0.19.6" />
      <tp:docstring>
        <p>If non-empty in a channel request that will create a new channel,
          the connection manager should send the tones immediately after
          at least one eligible audio stream has been created in the
          channel.</p>

        <p>This should only be used with InitialAudio=true.</p>

        <p>This property is immutable (cannot change).</p>
      </tp:docstring>
    </property>

    <property name="DeferredTones" tp:name-for-bindings="Deferred_Tones"
        type="s" access="read">
      <tp:added version="0.21.3" />
      <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> or
          <tp:member-ref>InitialTones</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">
      <tp:added version="0.19.6" />
      <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">
      <tp:added version="0.19.6" />
      <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>

    <tp:enum name="DTMF_Event" type="y">
      <tp:enumvalue suffix="Digit_0" value="0">
        <tp:docstring>0</tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Digit_1" value="1">
        <tp:docstring>1</tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Digit_2" value="2">
        <tp:docstring>2</tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Digit_3" value="3">
        <tp:docstring>3</tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Digit_4" value="4">
        <tp:docstring>4</tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Digit_5" value="5">
        <tp:docstring>5</tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Digit_6" value="6">
        <tp:docstring>6</tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Digit_7" value="7">
        <tp:docstring>7</tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Digit_8" value="8">
        <tp:docstring>8</tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Digit_9" value="9">
        <tp:docstring>9</tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Asterisk" value="10">
        <tp:docstring>*</tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Hash" value="11">
        <tp:docstring>#</tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Letter_A" value="12">
        <tp:docstring>A</tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Letter_B" value="13">
        <tp:docstring>B</tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Letter_C" value="14">
        <tp:docstring>C</tp:docstring>
      </tp:enumvalue>
      <tp:enumvalue suffix="Letter_D" value="15">
        <tp:docstring>D</tp:docstring>
      </tp:enumvalue>
    </tp:enum>
  </interface>
</node>
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