Re: TTS proposal to split Utterance into its own interface

I've updated the spec by adding an 'onresume' event and renaming the
'continue' method as 'resume' (no change to definition).
https://dvcs.w3.org/hg/speech-api/rev/253bab5be673

As always, the current draft spec is at:
http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html

/Glen Shires

On Tue, Sep 18, 2012 at 1:59 PM, Nagesh Kharidi <nagesh@openstream.com>wrote:

> Glen,
>
> Wouldn't placing the onresume code after call to the continue/resume
> method result in a lot of if/then/else checks to implement logic based on
> the utterance that was resumed? In addition, we would have to store a
> reference to the paused utterance in the onpause handler. These drawbacks
> can be avoided by adding the onresume event.
>
> Regards,
> Nagesh
>
> On Sep 18, 2012, at 3:04 PM, Glen Shires wrote:
>
> Nagesh,
> Yes, I had originally proposed an onresume event (same functionality as a
> continue event), but omitted it because I couldn't think of a good use
> case.  onpause is useful because it indicates which of the utterances was
> paused when the pause method was called. However, onresume would always be
> called on that same object in response to calling the continue method.
> (Thus it seems that whatever code that might be placed in an onresume
> function could just as easily be placed after the call to the continue
> method.)  I'm not opposed to adding onresume, but I'd like to see some good
> use cases for it.
> /Glen Shires
>
> On Tue, Sep 18, 2012 at 11:26 AM, Nagesh Kharidi <nagesh@openstream.com>wrote:
>
>> Glen,
>>
>> Looks good. I propose that we enhance SpeechSynthesisUtterance by adding
>> a continue event (fired when a paused utterance is resumed) and a
>> corresponding oncontinue event handler.
>>
>> Regards,
>> Nagesh
>>
>> On Sep 18, 2012, at 1:25 AM, Glen Shires wrote:
>>
>> I've updated the spec with the above SpeechSynthesis and
>> SpeechSynthesisUtterance IDL and definitions:
>> https://dvcs.w3.org/hg/speech-api/rev/b036c78e9445
>>
>> As always, the current draft spec is at:
>> http://dvcs.w3.org/hg/speech-api/raw-file/tip/speechapi.html
>>
>> On Sat, Sep 15, 2012 at 1:31 PM, Glen Shires <gshires@google.com> wrote:
>>
>>> Nagesh,
>>> I agree that cancelAll() is useful and can make code simpler because it
>>> doesn't affect the paused state.  In fact, I propose that we add
>>> cancelAll() and remove stop() -- because the stop function is probably less
>>> common and can easily be accomplished with two calls: cancelAll() and
>>> pause().
>>>
>>> Also, since canceling a specific utterance is not very useful, and questionable
>>> as Jerry states, I propose eliminating cancel(utterance). If we do that,
>>> then we could rename cancelAll() more simply as cancel().
>>>
>>> Thus, I propose this IDL:
>>>
>>>     interface SpeechSynthesis {
>>>       static readonly attribute boolean pending;
>>>        static readonly attribute boolean speaking;
>>>       static readonly attribute boolean paused;
>>>
>>>       static void speak(SpeechSynthesisUtterance utterance);
>>>       static void cancel();
>>>        static void pause();
>>>       static void continue();
>>>     }
>>>
>>> and I propose this new definition of cancel:
>>>
>>> The cancel method
>>> This method removes all utterances from the queue. If an utterance is
>>> being spoken, speaking ceases immediately. This method does not change the
>>> paused state of the SpeechSynthesis object.
>>>
>>>  /Glen Shires
>>>
>>>
>>> On Sat, Sep 15, 2012 at 3:25 AM, Nagesh Kharidi <nagesh@openstream.com>wrote:
>>>
>>>> Please see inline.
>>>>
>>>> Regards,
>>>> Nagesh
>>>>
>>>> On Fri, 14 Sep 2012 12:59:41 -0700
>>>>  Glen Shires <gshires@google.com> wrote:
>>>> >> Provide the ability to cancel all currently queued utterances.
>>>> >
>>>> >The stop() method cancels all queued utterances. (Dominic proposed
>>>> >that
>>>> >this message be named stopAndFlushQueue(), would that name be more
>>>> >clear?)
>>>>
>>>> In addition to canceling all queued utterances, the stop() method also
>>>> pauses the SpeechSynthesis object. A separate cancelAll() method would
>>>> be useful, without which, if a new utterance is to be spoken
>>>> immediately, we would have to do :
>>>> speechSynthesis.stop();
>>>> speechSynthesis.continue();
>>>> speechSynthesis.speak(utterance);
>>>>
>>>> With a cancelAll() method, this would be:
>>>> speechSynthesis.cancelAll();
>>>> speechSynthesis.speak(utterance);
>>>>
>>>> Since this would be such a common usage, we could make it even easier
>>>> for developers by either:
>>>> - providing a speakImmediate(utterance) method that cancels all queued
>>>> utterances and then starts speaking the new utterance
>>>> or
>>>> - adding a second parameter as follows to the speak() method:
>>>> speechSynthesis.speak(utterance, speakImmediately);
>>>> If speakImmediately is true, all currently queued utterances will be
>>>> canceled and the new utterance will be spoken.
>>>>
>>>> >
>>>> >Also, what is the use case for the current cancel(utterance) method?
>>>> > In
>>>> >all the use cases I envision, you'd want to cancel all queued
>>>> >utterances.
>>>> >Can we eliminate cancel() ?
>>>>
>>>> I also agree that canceling a specific utterance is not very useful.
>>>> Canceling all queued utterances would be more common than canceling a
>>>> specific utterance.
>>>>
>>>> >
>>>> >
>>>> >> New speakNext SpeechSynthesis method - append the utterance to the
>>>> >beginning of the queue
>>>> >
>>>> >I'd like more discussion on this. What are the use cases? What are the
>>>> >edge
>>>> >cases (e.g. If there's a race-condition, the current utterance may
>>>> >finish
>>>> >and the second in the queue may begin speaking before this new
>>>> >utterance is
>>>> >inserted).
>>>>
>>>> Use case for speakNext() method: Consider a news application that plays
>>>> the latest news items. It queues all news items to be played. Now if
>>>> there is a new "breaking news" item that comes in, the speakNext()
>>>> method can be used to play it as soon as possible without canceling the
>>>> already queued items.
>>>>
>>>>
>>>> >
>>>> >
>>>> >>  Question:  Can a cancelled utterance be re-queued?
>>>> >
>>>> >Good question, and also, what is the lifetime of a
>>>> >SpeechSynthesisUtterance
>>>> >object and who owns it. There's at least 3 possibilities:
>>>> >
>>>> >1. The speak() method takes ownership when it adds it to the queue,
>>>> >then it
>>>> >would presumably be destroyed upon cancel or onend.
>>>> >    (This raises the questions: what usefulness is
>>>> >the SpeechSynthesisUtterance object attribute "ended", since the
>>>> >object
>>>> >will be destroyed when it turns true. It also makes it messy to use
>>>> >the
>>>> >other readonly attributes because the object may be deleted suddenly.
>>>> >Also, what if the author deletes the SpeechSynthesisUtterance object
>>>> >prior
>>>> >to it being spoken.  One easy way to accidentally create this bug is
>>>> >to
>>>> >define the SpeechSynthesisUtterance object in a method that goes out
>>>> >of
>>>> >scope.)
>>>> >
>>>> >2. The speak() method does not take ownership when it adds it directly
>>>> >to
>>>> >queue.
>>>> >    (This raises the question: what if the author deletes the
>>>> >SpeechSynthesisUtterance object prior to it being spoken.  One easy
>>>> >way to
>>>> >accidentally create this bug is to define the SpeechSynthesisUtterance
>>>> >object in a method that goes out of scope.)
>>>> >
>>>> >3. The speak() method does not take ownership, it makes a copy of it
>>>> >when
>>>> >it adds it to queue .
>>>> >    (This raises the question: how can the author's
>>>> >original SpeechSynthesisUtterance object readonly attributes
>>>> >(speaking,
>>>> >paused, ended) reflect the state of the copy on the queue.)
>>>> >
>>>> >
>>>> >To resolve these issues, I propose the following, because I think it's
>>>> >the
>>>> >cleanest solution and easiest for authors, since they can create and
>>>> >destroy objects, and go out of scope, without worrying about the
>>>> >speaking
>>>> >queue timing:
>>>> >
>>>> >The speak() method does not take ownership of the
>>>> >SpeechSynthesisUtterance
>>>> >object, it makes a copy of it when it adds it to queue.  We eliminate
>>>> >the SpeechSynthesisUtterance readonly attributes, relying instead on
>>>> >events
>>>> >that indicate change in state, including new events for: onpause,
>>>> >onresume.
>>>> >
>>>> >Because it's a copy of the object, this clarifies that:
>>>> >- changes to the original SpeechSynthesisUtterance object after
>>>> >calling
>>>> >speak() do not affect the copy on the queue.
>>>> >- the same SpeechSynthesisUtterance object can be used to call speak()
>>>> >multiple times, (even after a copy of which was spoken or cancelled).
>>>> >
>>>> >The new IDL would be:
>>>> >
>>>> >    interface SpeechSynthesisUtterance {
>>>> >      attribute DOMString text;
>>>> >      attribute DOMString lang;
>>>> >      attribute DOMString serviceURI;
>>>> >
>>>> >      attribute Function onstart;
>>>> >      attribute Function onend;
>>>> >*      attribute Function onpause;*
>>>> >*      attribute Function onresume;*
>>>> >    }
>>>> >
>>>> >
>>>> >And the new definition:
>>>> >
>>>> >The speak method
>>>> >This method appends *a copy of* the utterance to the end of the queue
>>>> >for
>>>> >this SpeechSynthesis object. It does not change the paused state of
>>>> >the
>>>> >SpeechSynthesis object.  If the SpeechSynthesis object is paused, it
>>>> >remains paused. If it is not paused, then this utterance is spoken if
>>>> >no
>>>> >other utterances are in the queue, else this utterance is queued to
>>>> >begin
>>>> >speaking after the other utterances in the queue have been spoken.
>>>> >
>>>> >
>>>> >/Glen Shires
>>>> >
>>>> >
>>>> >On Fri, Sep 14, 2012 at 6:05 AM, Jim Barnett
>>>> ><Jim.Barnett@genesyslab.com>wrote:
>>>> >
>>>> >> I would  think that cancelling all utterances would be the more
>>>> >common use
>>>> >> case (so we ought to make it easy).  Question:  Can a cancelled
>>>> >utterance
>>>> >> be re-queued?
>>>> >>
>>>> >> - Jim
>>>> >>
>>>> >> -----Original Message-----
>>>> >> From: Nagesh Kharidi [mailto:nagesh@openstream.com]
>>>> >> Sent: Friday, September 14, 2012 8:58 AM
>>>> >> To: Glen Shires; Dominic Mazzoni
>>>> >> Cc: Hans Wennborg; olli@pettay.fi; public-speech-api@w3.org
>>>> >> Subject: Re: TTS proposal to split Utterance into its own interface
>>>> >>
>>>> >> I would like to propose the following:
>>>> >> 1. Provide the ability to cancel all currently queued utterances. A
>>>> >new
>>>> >> cancelAll method could be added. Alternately, invoking the cancel
>>>> >method
>>>> >> without the utterance parameter could imply cancel all utterances.
>>>> >>
>>>> >> 2. New speakNext SpeechSynthesis method
>>>> >> This method will append the utterance to the beginning of the queue.
>>>> >>
>>>> >> 3. New oncancel SpeechSynthesisUtterance event Fired when the
>>>> >utterance is
>>>> >> canceled.
>>>> >>
>>>> >> 4. New canceled SpeechSynthesisUtterance attribute true if the
>>>> >utterance
>>>> >> is canceled.
>>>> >>
>>>> >>
>>>> >> I also had a question regarding the stop method: Is "flushes the
>>>> >queue"
>>>> >> equivalent to calling cancel on all utterances in the queue? If so,
>>>> >I
>>>> >> would like to suggest changing "flushes the queue" to "cancels all
>>>> >> utterances in the queue".
>>>> >>
>>>> >> Regards,
>>>> >> Nagesh
>>>> >>
>>>> >> On Thu, 13 Sep 2012 14:13:56 -0700
>>>> >>  Glen Shires <gshires@google.com> wrote:
>>>> >> >Yes, I like the way you've defined the "speak" method to not change
>>>> >the
>>>> >> >play/pause state. Also, I didn't particularly like the word
>>>> >"playback",
>>>> >> >so thanks for the alternative "spoken".  Here's updated definitions
>>>> >> >with your suggestions incorporated. If there's no disagreement,
>>>> >I'll
>>>> >> >add them to the spec on Monday.
>>>> >> >
>>>> >> >
>>>> >> >SpeechSynthesis Attributes
>>>> >> >
>>>> >> >pending attribute:
>>>> >> >This attribute is true if the queue for this SpeechSynthesis object
>>>> >> >contains any utterances which have not started speaking.
>>>> >> >
>>>> >> >speaking attribute:
>>>> >> >This attribute is true if an utterance is being spoken.
>>>> >Specifically if
>>>> >> >an utterance has begun being spoken and has not completed being
>>>> >spoken,
>>>> >> >and is independent of whether this SpeechSynthesis object is in the
>>>> >> >paused state.
>>>> >> >
>>>> >> >paused attribute:
>>>> >> >The attribute is true when this SpeechSynthesis object is in the
>>>> >paused
>>>> >> >state. This state is independent of whether anything is in the
>>>> >queue.
>>>> >> >The
>>>> >> >default state of a new SpeechSynthesis object is the non-paused
>>>> >state.
>>>> >> >
>>>> >> >
>>>> >> >SpeechSynthesis Methods
>>>> >> >
>>>> >> >The speak method
>>>> >> >This method appends the utterance to the end of the queue for this
>>>> >> >SpeechSynthesis object. It does not change the paused state of the
>>>> >> >SpeechSynthesis object.  If the SpeechSynthesis object is paused,
>>>> >it
>>>> >> >remains paused. If it is not paused, then this utterance is spoken
>>>> >if
>>>> >> >no other utterances are in the queue, else this utterance is queued
>>>> >to
>>>> >> >begin speaking after the other utterances in the queue have been
>>>> >> >spoken.
>>>> >> >
>>>> >> >The cancel method
>>>> >> >This method removes the specified utterance from the queue. If it
>>>> >is
>>>> >> >not in the queue, no changes are made. If the utterance removed is
>>>> >> >being spoken, speaking ceases for that utterance and the next
>>>> >utterance
>>>> >> >in the queue (if
>>>> >> >any) begins to be spoken. This method does not change the paused
>>>> >state
>>>> >> >of the SpeechSynthesis object.
>>>> >> >
>>>> >> >The pause method
>>>> >> >This method puts the SpeechSynthesis object into the paused state.
>>>> >If
>>>> >> >an utterance was being spoken, it pauses mid-utterance. (If called
>>>> >when
>>>> >> >the SpeechSynthesis object was already in the paused state, it does
>>>> >> >nothing.)
>>>> >> >
>>>> >> >The continue method
>>>> >> >This method puts the SpeechSynthesis object into the non-paused
>>>> >state.
>>>> >> >If
>>>> >> >an utterance was speaking (that is, its speaking attribute is
>>>> >true), it
>>>> >> >continues speaking the utterance at the point at which it was
>>>> >paused,
>>>> >> >else it begins speaking the next utterance in the queue (if any).
>>>> >(If
>>>> >> >called when the SpeechSynthesis object was already in the
>>>> >non-paused
>>>> >> >state, it does nothing.)
>>>> >> >
>>>> >> >The stop method.
>>>> >> >This method puts the SpeechSynthesis object into the paused state
>>>> >and
>>>> >> >flushes the queue. It sets the speaking attribute to false and the
>>>> >> >paused attribute to true.
>>>> >> >
>>>> >> >
>>>> >> >SpeechSynthesisUtterance attributes
>>>> >> >
>>>> >> >
>>>> >> >[[Note, I used SHOULD here because there may be some race-condition
>>>> >> >edge-cases where it might not be ignored.]]
>>>> >> >
>>>> >> >text attribute:
>>>> >> >The text to be synthesized for this utterance. Changes to this
>>>> >> >attribute after the utterance has been added to the queue (by
>>>> >calling
>>>> >> >the speak
>>>> >> >method) SHOULD be ignored.
>>>> >> >
>>>> >> >lang attribute:
>>>> >> >[no change except to append the following] Changes to this
>>>> >attribute
>>>> >> >after the utterance has been added to the queue (by calling the
>>>> >speak
>>>> >> >method)
>>>> >> >SHOULD be ignored.
>>>> >> >
>>>> >> >serviceURI attribute:
>>>> >> >[no change except to append the following] Changes to this
>>>> >attribute
>>>> >> >after the utterance has been added to the queue (by calling the
>>>> >speak
>>>> >> >method)
>>>> >> >SHOULD be ignored.
>>>> >> >
>>>> >> >speaking attribute:
>>>> >> >This attribute is true if this specific utterance is currently
>>>> >being
>>>> >> >spoken. Specifically if this utterance has begun being spoken and
>>>> >has
>>>> >> >not completed being spoken. This is independent of whether the
>>>> >> >SpeechSynthesis object is in a paused state.
>>>> >> >
>>>> >> >paused attribute:
>>>> >> >This attribute is true if this specific utterance has begun to be
>>>> >> >spoken, but has not completed and the SpeechSynthesis object is in
>>>> >the
>>>> >> >paused state.
>>>> >> >
>>>> >> >ended attribute:
>>>> >> >This attribute is true if this specific utterance has completed
>>>> >being
>>>> >> >spoken.
>>>> >> >
>>>> >> >SpeechSynthesisUtterance events
>>>> >> >
>>>> >> >onstart event:
>>>> >> >Fired when this utterance has begun to be spoken.
>>>> >> >
>>>> >> >onend event:
>>>> >> >Fired when this utterance has completed being spoken.
>>>> >> >
>>>> >> >
>>>> >> >
>>>> >> >On Thu, Sep 13, 2012 at 10:25 AM, Dominic Mazzoni
>>>> >> ><dmazzoni@google.com>wrote:
>>>> >> >
>>>> >> >> Thanks for proposing definitions.
>>>> >> >>
>>>> >> >> On Tue, Sep 11, 2012 at 3:02 AM, Glen Shires <gshires@google.com>
>>>> >> >wrote:
>>>> >> >> > I propose the following definitions for the SpeechSynthesis
>>>> >IDL:
>>>> >> >> >
>>>> >> >> > SpeechSynthesis Attributes
>>>> >> >> >
>>>> >> >> > pending attribute:
>>>> >> >> > This attribute is true if the queue contains any utterances
>>>> >which
>>>> >> >have
>>>> >> >> not
>>>> >> >> > completed playback.
>>>> >> >>
>>>> >> >> I was imagining: This attribute is true if the queue contains any
>>>> >> >> utterances which have not *started* speaking.
>>>> >> >>
>>>> >> >> > speaking attribute:
>>>> >> >> > This attribute is true if playback is in progress.
>>>> >> >>
>>>> >> >> I don't like the word "playback", it doesn't fit when the speech
>>>> >is
>>>> >> >> generated dynamically. How about: This attribute is true if an
>>>> >> >> utterance is being spoken.
>>>> >> >>
>>>> >> >> > paused attribute:
>>>> >> >> >   **** How is this different than (pending && !speaking) ? ****
>>>> >> >>
>>>> >> >> This is true if the speech synthesis system is in a paused state,
>>>> >> >> independent of whether anything is speaking or queued.
>>>> >> >>
>>>> >> >> paused && speaking -> it was paused in the middle of an utterance
>>>> >> >> paused && !speaking -> no utterance is speaking, but if you call
>>>> >> >> speak(), nothing will happen because it's in a paused state.
>>>> >> >>
>>>> >> >> >
>>>> >> >> > SpeechSynthesis Methods
>>>> >> >> >
>>>> >> >> > The speak method
>>>> >> >> > This method appends the utterance to the end of a playback
>>>> >queue.
>>>> >> >If
>>>> >> >> > playback is not in progress, it also begins playback of the
>>>> >next
>>>> >> >item in
>>>> >> >> the
>>>> >> >> > queue.
>>>> >> >>
>>>> >> >> What do you think about rewriting to not use "playback"?
>>>> >> >>
>>>> >> >> Also, my idea was that it would not begin playback if the system
>>>> >is
>>>> >> >in
>>>> >> >> a paused state.
>>>> >> >>
>>>> >> >> > The cancel method
>>>> >> >> > This method removes the first matching utterance (if any) from
>>>> >the
>>>> >> >> playback
>>>> >> >> > queue. If playback is in progress and the utterance removed is
>>>> >> >being
>>>> >> >> played,
>>>> >> >> > playback ceases for the utterance and the next utterance in the
>>>> >> >queue (if
>>>> >> >> > any) begins playing.
>>>> >> >>
>>>> >> >> Do we need to say "first matching"? Each utterance should be a
>>>> >> >> specific object, it should be either in the queue or not.
>>>> >> >>
>>>> >> >> > The pause method
>>>> >> >> > This method pauses the playback mid-utterance. If playback is
>>>> >not
>>>> >> >in
>>>> >> >> > progress, it does nothing.
>>>> >> >>
>>>> >> >> I was assuming that calling it would set the system into a paused
>>>> >> >> state, so that even a subsequent call to speak() would not do
>>>> >> >anything
>>>> >> >> other than enqueue.
>>>> >> >>
>>>> >> >> > The continue method
>>>> >> >> > This method continues the playback at the point in the
>>>> >utterance
>>>> >> >and
>>>> >> >> queue
>>>> >> >> > in which it was paused.  If playback is in progress, it does
>>>> >> >nothing.
>>>> >> >> >
>>>> >> >> > The stop method.
>>>> >> >> > This method stops playback mid-utterance and flushes the queue.
>>>> >> >> >
>>>> >> >> >
>>>> >> >> > SpeechSynthesisUtterance attributes
>>>> >> >> >
>>>> >> >> > text attribute:
>>>> >> >> > The text to be synthesized for this utterance. This attribute
>>>> >must
>>>> >> >not be
>>>> >> >> > changed after onstart fires.
>>>> >> >>
>>>> >> >> I'd say: changes to this attribute after the utterance has been
>>>> >> >added
>>>> >> >> to the queue (by calling "speak") will be ignored. OR, we should
>>>> >> >make
>>>> >> >> it a DOM exception to modify it when it's in the speech queue.
>>>> >> >>
>>>> >> >> > paused attribute:
>>>> >> >> > This attribute is true if this specific utterance is in the
>>>> >queue
>>>> >> >and has
>>>> >> >> > not completed playback.
>>>> >> >>
>>>> >> >> I think this should only be true if it has begin speaking but not
>>>> >> >> completed.
>>>> >> >>
>>>> >> >> - Dominic
>>>> >> >>
>>>> >>
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