Home/ Questions/Q 8900315
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-15T01:04:35+00:00

In AudioStreamBasicDescription struct: struct AudioStreamBasicDescription { Float64 mSampleRate; UInt32 mFormatID; UInt32 mFormatFlags; UInt32 mBytesPerPacket;

  • 0

In AudioStreamBasicDescription struct:

struct AudioStreamBasicDescription {
    Float64 mSampleRate;
    UInt32  mFormatID;
    UInt32  mFormatFlags;
    UInt32  mBytesPerPacket;
    UInt32  mFramesPerPacket;
    UInt32  mBytesPerFrame;
    UInt32  mChannelsPerFrame;
    UInt32  mBitsPerChannel;
    UInt32  mReserved; 
};

if we know nChannelsPerFrame and mBitsPerChannels, we can calculate mBytesPerFrame like this:
mBytesPerFrame = mBitsPerChannels * mChannelsPerFrame / 8 (correct me if I’m wrong)

I believe that all of the fields exist for some reason. What is it for mBytesPerFrame?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Yes. The field can be used to aid in describing packing and alignment of LPCM sample data/frames. That’s also mandatory for describing some external LPCM representations.

    For example, you can specify a 20 bit sample size, but an implementation may favor to represent/transfer/store that using 3 bytes, or 24 bits (ignoring 4 bits per sample).

    • 0