Accessing audio samples from Audio Queue Buffers
Accessing audio samples from Audio Queue Buffers
- Subject: Accessing audio samples from Audio Queue Buffers
- From: KappA <email@hidden>
- Date: Wed, 9 Sep 2009 16:48:15 -0400
Hi All,
I am hoping this is a somewhat simple question. I am using Audio Queue's for audio playback (iPhone OS3), and I would like to add some simple EQ effects to the audio output... I am supporting MP3 and AAC playback, so I will need my solution to still be able to support these formats.
I'd basically like to use this EQ function:
http://musicdsp.org/archive.php?classid="">
Which takes an audio sample input of type "double", and returns a modified sample output, of type "double"
I can actually see where we copy the audio bytes to the audio buffer data structure, in the Audio Queue Services callbacks... but I am not sure how to convert the raw audio bytes to audio samples, where I can manipulate them...
Is this even possible? Am totally off base here?
If it is not possible, any other ideas to acheive something similar with Audio Queues?
If I cannot do it with Audio Queues, is there something else I can use for playback, that will support MP3's and AAC etc?
I can share more info if needed.
Any help appreciated.
Thanks,
KappA
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