Re: m4a blank file on recording
Re: m4a blank file on recording
- Subject: Re: m4a blank file on recording
- From: Doug Wyatt <email@hidden>
- Date: Wed, 12 Oct 2005 14:14:07 -0700
If you log your calls to AudioFileWritePackets -- are you writing a
continuous/contiguous series of packet numbers?
Doug
On Oct 11, 2005, at 20:20, Olivier Destrebecq wrote:
I modified my code so that i get the same output, but still no luck:-(
Thanks
Olivier
http://otusweb.spymac.com/home/
On Oct 11, 2005, at 8:34 PM, Doug Wyatt wrote:
On Oct 11, 2005, at 4:00 PM, Olivier Destrebecq wrote:
MTCoreAudioStreamDescription *audioStreamDescription =
[MTCoreAudioStreamDescription streamDescription];//[[[[[self
recordingDevice] streamsForDirection:
kMTCoreAudioDeviceRecordDirection] objectAtIndex: 0]
streamDescriptionForSide: kMTCoreAudioStreamLogicalSide] copy];
[audioStreamDescription setFormatID: kAudioFormatMPEG4AAC];
[audioStreamDescription setChannelsPerFrame: 2];
If I run "afrecord -f m4af -d 'aac ' /tmp/foo.m4a", then "afinfo /
tmp/foo.m4a" shows:
Data format: 2 ch, 44100 Hz, 'aac ' (0x00000002) 0 bits/
channel, 0 bytes/packet, 1024 frames/packet, 0 bytes/frame
How does this compare with the AudioStreamBasicDescription you are
setting on the file? The (2) is mFormatFlags but I don't believe
you need to be setting that.
Doug
--
Doug Wyatt
Core Audio, Apple
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