Re: Playing multiple .caf files simultaneously - one queue?
Re: Playing multiple .caf files simultaneously - one queue?
- Subject: Re: Playing multiple .caf files simultaneously - one queue?
- From: "Shane Vitarana" <email@hidden>
- Date: Mon, 22 Sep 2008 10:45:52 -0500
Have you looked into using OpenAL?
On Mon, Sep 22, 2008 at 7:41 AM, Trygve Inda <email@hidden> wrote:
> I need to play several .caf (IMA4) audio files simultaneously with very
> specific timing. E.g.:
>
> FileA is 1 minute long and stars at time 0
> FileB is 1 minute long and starts exactly when FileA ends
> FileC is 10 seconds long and starts 55 seconds after FileA (it overlaps A&B)
>
> To now, I have been doing this in QuickTime but need to adapt it to
> CoreAudio so it can work on the iPhone.
>
> Should I be doing this with a single queue and using
> AudioQueueEnqueueBufferWithParameters?
>
> If I use multiple queues, how to I keep timing synchronized?
>
> The ref says:
>
> Buffers play in the order they are enqueued (first in, first out). If
> multiple buffers are queued, the start times must be in ascending order or
> NULL; otherwise, an error occurs. This parameter specifies when audio data
> is to start playing, ignoring any trim frames specified in the
> inTrimFramesAtStart parameter.
>
> So if FileC has to start in the middle of a buffer with FileA data, what
> happens? Likewise, how do I start playing two files simultaneously?
>
> Any sample code is greatly appreciated.
>
> This should be common enough to CA to be neutral, but it does need to work
> on the iPhone.
>
> Thanks,
>
> Trygve
>
>
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