iPhone - get duration of linear PCM audio file

Question

Hi

I have a linear PCM file (.wav) in my app and I would like to get it's duration programatically. I could find the following using AudioStreamBasicDescription but could not make out how to get the duration in seconds.

mFormatID
mSampleRate
mChannelsPerFrame
mBytesPerPacket
mFramesPerPacket
mBytesPerFrame
mBitsPerChannel

Can someone please tell me how I can get the duration.

Thanks.

Answer 1

You can create an AVAudioPlayer instance with your file. AVAudioPlayer has duration property.

Answer 2

Using AudioFile kAudioFilePropertyEstimatedDuration property is best, however if you want the math for PCM: duration = totalNumPackets * ASBD.mFramesPerPacket / ASBD.mSampleRate

Answer 3

Hi,

I am also using kAudioFilePropertyEstimatedDuration property to get duration . but in what format it will give duration. ?? and in which parameter it will give output. ?

Thanks in advance,

Mitul