|[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]|
I am reading an MP3 using AudioFileReadPackets and I've come across something strange. After reading the documentation and looking at some examples I am unable to reconcile why the calculated buffer size does not match the byte count I get from AudioFileGetProperty. err = AudioFileGetProperty(audioFile, kAudioFilePropertyAudioDataPacketCount, &dataSize, &packetCount); err = AudioFileGetProperty(audioFile, kAudioFilePropertyMaximumPacketSize, &dataSize, &maxPacketSize); err = AudioFileGetProperty(audioFile, kAudioFilePropertyAudioDataByteCount, &dataSize, &byteCount); I create a buffer based on the number of packets multiplied by the packet count. The byte count does not match when opening mp3's buffer = calloc( 1, packetCount * maxPacketSize ); mp3: packetCount * maxPacketSize > byteCount wave: packetCount * maxPacketSize == byteCount I thought the multiplication method would be correct however when I inspect the buffer, there is no sound data in the difference between the two sizes. Should I always use kAudioFilePropertyAudioDataByteCount to determine my buffer size? Shouldn't these methods always match perfectly? Thanks, W. _______________________________________________ Do not post admin requests to the list. They will be ignored. Coreaudio-api mailing list (email@hidden) Help/Unsubscribe/Update your Subscription: This email sent to email@hidden
Visit the Apple Store online or at retail locations.
Copyright © 2011 Apple Inc. All rights reserved.