Re: File format conversion
Re: File format conversion
- Subject: Re: File format conversion
- From: William Stewart <email@hidden>
- Date: Wed, 4 Feb 2009 19:17:04 -0800
It could be a bug in the audio file code.
We normally read and write files using the Read/Write Packets API (we
really don't use the bytes ones), so I wonder if this is a bug in our
code where we aren't updating the size chunk properly.
Bill
On Feb 4, 2009, at 6:16 PM, Fredrik wrote:
Thank you guys. I got a hint earlier as well to use or instead of
commas. After I changed it the AudioConverter works as expected and
writes the buffer as big endian. The size of the data isn´t written
in the header still though. I have tried to edit it in a hexeditor
and then the file plays normally so this seems to be what is left to
solve for me. Could this be a result of the offset parameter being
hardcoded as 0 at the moment? I noticed that no information on the
data size is expected in the argument fields of AudioFileCreate so I
assume that it get this information from elsewhere.
Fredrik
5 feb 2009 kl. 02.56 skrev Brian Willoughby:
Fredrik, the comma operator will compile, but it won't work. The C
language allows you to combine any number of expressions on a
single line using commas, but those expressions are not related to
each other in any way. Your code is assigning Big Endian, but
dropping the Signed Integer and Packed flags.
I bet that if you turned on compiler warnings, it would tell you
that you have orphaned expressions which are doing nothing.
Bill's suggestion below is absolutely correct, although I would
change the description from "usually" to "must always" !!
Brian Willoughby
Sound Consulting
On Feb 3, 2009, at 10:36 PM, Fredrik wrote:
So, your format flags aren't complete. You need:
kAudioFormatFlagIsBigEndian
kAudioFormatFlagIsSignedInteger
kAudioFormatFlagIsPacked
Yes, that makes sense. I added these flags. What is the proper
way to do that though? I just separated them by commas now, and
that compiled fine. Like this:
OutFormat.mFormatFlags = kAudioFormatFlagIsBigEndian,
kAudioFormatFlagIsSignedInteger,
kAudioFormatFlagIsPacked;
I usually or them in:
OutFormat.mFormatFlags = kAudioFormatFlagIsBigEndian |
kAudioFormatFlagIsSignedInteger |
kAudioFormatFlagIsPacked;
Bill
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