Apple

On Jun 12, 2012, at 7:32 PM, Michael Hanna wrote:

I can start and play a file successfully with a simple AUGraph. It wraps a "AUGraphFilePlayer" struct that makes a simple graph like:

FileAUNode -- OutputNode

What I would like to do next is via a user event(press pause) have the AUGraph play silence, then <press play> continue the playback of the file.

So how do I go about that? Should I feed the file node AURenderCallback silence, something like

(void)MyRenderCallback(... ... ...)
{
if paused state

assign 0s to buffers
if not paused state
do normal file rendering
}

I did try and add a render callback to the fileAUNode like this:

AURenderCallbackStruct input;
input.inputProc = FileRenderProc;
input.inputProcRefCon = player_;
CheckError(AudioUnitSetProperty
(player_->fileAU, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &input, sizeof(input)), "AudioUnitSetProperty failed");

Which resulted in this: Error: AudioUnitSetProperty failed (-10877), not sure why.

Is there a better way to skin this cat?

I have posted my class on pastebin:

MZRGraphPlayer.h: http://pastebin.com/6K2kZtWK
MZRGraphPlayer.m: http://pastebin.com/3vzqyQbY

Any suggestions greatly appreciated.
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References:
	>Get AUGraph to play silence (From: Michael Hanna <email@hidden>)