Questions regarding output from afinfo
Questions regarding output from afinfo
- Subject: Questions regarding output from afinfo
- From: "Michael A. Crawford" <email@hidden>
- Date: Thu, 06 Aug 2009 13:16:59 -0400
Thanks, Jeff. I'm new to Core Audio so I had no idea this utility was available. Next question:
Consider the following output from afinfo:
File: howarddean.mp3
File type ID: MPG3
Data format: 2 ch, 44100 Hz, '.mp3' (0x00000000) 0 bits/channel, 0 bytes/packet, 1152 frames/packet, 0 bytes/frame
no channel layout.
estimated duration: 22.000 sec
audio bytes: 357901
audio packets: 856
bit rate: 128000 bits per second
packet size upper bound: 1052
maximum packet size: 418
audio data file offset: 499
optimized
Is this reasonable? I assume 0 bits/channel is because there is no channel layout? How can there be 0 bytes/packet and 0 bytes/frame? This doesn't seem valid, unless it is because the data is compressed and needs to be decompressed before these properties make sense?
Anyone care to help me understand this? What am I missing?
If there is a document that will clear this up please point me at it and I'll read it.
-Michael
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