Re: Basic AudioQueue Service issue
Re: Basic AudioQueue Service issue
- Subject: Re: Basic AudioQueue Service issue
- From: William Stewart <email@hidden>
- Date: Wed, 22 Oct 2008 18:02:35 -0700
I understand your frustration.
However, we can't fix bugs if we are just going to get random comments
about "i've tried this and blah happens". I know that sucks, but we
aren't prescient.
A good procedure to follow is to have an example - lets say you start
with speak here or aqplay - and you modify it in some way to do what
you want it to do. it doesn't work. A simple post to describe what you
tried to do and why it didn't work is not a bad starting point. If we
get to the point that what we think you are doing should work, then we
would have you file a bug and attach some code so that we can see the
problem happening and then understand it.
I really have no idea what to do with these kinds of complaints though
- I know it sounds obvious to you, but to me what you have changed/
done to do this is completely opaque.
Bill
On Oct 20, 2008, at 8:33 PM, Craig Patchett wrote:
I'm trying to do the same thing and am having all kinds of problems.
Would it be possible for someone to provide a code solution or a
summary of what changes need to be made in order to replay a queue
without reinitializing it? Specifically:
- How to restart a queue after it has finished playing
- How to restart a queue that is currently playing
It seems like it should be simple to do, and perhaps it is for
someone with a lot of experience with CoreAudio, but finding the
right combination of method calls is approaching black magic for me!
Specifically I've run into the following problems:
- No sound after the queue has played all the way through (like
Romain describes)
- The sound not playing properly the second time through (usually
with an echo of some sort)
- Various crashes and freezes that seem to be related to locking issue
- A pop when the sound is restarted during playback
I've come up with various combinations of ideas that end up
resolving one or two of these problems but have yet to come up with
something that solves them all. I've spent enough time in both the
SpeakHere sample code and the AudioQueue guide sample code that I
understand what's going on in the code, but the behind-the-scenes
behavior of the various AudioQueue calls seems to be what's giving
me trouble.
I've spent more time than I care to admit trying to come up with a
solution to this and would really appreciate any help. At this stage
I'm even willing to put my money where my mouth is and offer $100
for a working, coded solution.
Thanks.
Craig
On Oct 20, 2008, at 11:08 AM, Romain Pechayre wrote:
Hello,
I am new to CoreAudio Programming and I have a problem with an
AudioQueue. I use it to play a simple short sound but I need to
control the volume, that is why I don't use SystemSounds instead.
I am trying to play an audioqueue without having to initialize it
from scratch every time I use it. For example, I don't want to open
the associated file every time I play the sound.
To do so, I have tried to customize the playBackCallback function
from SpeakHere iPhone sample code. It is pretty much the same as
the one used in AudioQueue Services Programming guide. I have just
set mCurrentPacket to 0 every time I call the callback function. It
seems to work well because it reads the same number of packets with
audiofileReadPackets everytime I call it. The problem is that the
sound is actually played only when I call AudioQueueStart for the
first time.
To be more specific, I have a button that is supposed to play a
sound when I press it. It works when I press it for the first time
but it does not as of the second time. I have tried debugging a
number of parameters including everything I could in the callback
function, and the behavour seems to be the same except that the
sound is actully played only at the first attempt.
I was therefore wondering if is technically possible to play an
AudioQueue again and again without having to initialize it from
scratch ( which means calling
CFURLCreateFromFileSystemRepresentation and AudioQueueNewOutput ).
I hope the formulation of my question is not too bad and you will
be able to help me.
Kind regards
Romain Pechayre
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