Re: Decoding raw AMR
Re: Decoding raw AMR
- Subject: Re: Decoding raw AMR
- From: James McCartney <email@hidden>
- Date: Mon, 29 Jan 2007 16:35:40 -0800
On Jan 29, 2007, at 12:36 PM, Martin Storsjö wrote: As mentioned, I've already got the data in packets, the problem is using the AudioConverter API (or AudioCodec directly) to decode them. But I haven't been able to avoid getting the kAudioCodecStateError when trying to decode them. Is there any extra properties specific to this codec which need to be set?
You should not attempt to use an AudioCodec directly but instead use an AudioConverter. There are many subtle and sometimes counter-intuitive details that are easy to get wrong when interacting with various codecs directly.
The AMR codec requires a magic cookie in order to decode. If you don't set the magic cookie on the AudioConverter, then the AudioCodec will return kAudioCodecStateError. A magic cookie is a string of bytes in some opaque codec-dependant format which are used to configure the decoder.
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