info

Information about specific audio file

Syntax

S = info(afr)

Description

S = info(afr) returns a MATLAB^® structure, S, with information about the audio file specified in the Filename property.

Examples

Obtain Information About Audio File

Read an audio file using the dsp.AudioFileReader object. Obtain information related to the audio content of the file.

The dsp.AudioFileReader objects reads the default shipped file 'speech_dft.mp3'.

afr = dsp.AudioFileReader

afr = 
  dsp.AudioFileReader with properties:

           Filename: '/mathworks/devel/bat/filer/batfs2566-0/Bdoc24b.2725827/build/runnable/matlab/toolbox/dsp/dsp/samples/speech_dft.mp3'
          PlayCount: 1
          ReadRange: [1 Inf]
    SamplesPerFrame: 1024
     OutputDataType: 'double'

  Use get to show all properties

The output structure displays the sample rate of the audio signal in Hz, number of bits used to encode the audio stream, and the number of audio channels.

S = info(afr)

S = struct with fields:
      SampleRate: 22050
         NumBits: 16
    TotalSamples: 112320
        Duration: 5.0939
     NumChannels: 1

Input Arguments

afr — File reader

dsp.AudioFileReader (default)

File reader, specified as a dsp.AudioFileReader System object™.

Output Arguments

S — Audio file information

structure

Information about the audio file specified in the Filename property, returned as a structure. The number of fields in the structure S varies depending on the audio content of the file. This table shows some of the fields that can appear in the structure S.

Field	Value
SampleRate	Audio sampling rate of the audio file in Hz.
NumBits	Number of bits used to encode the audio stream.
NumChannels	Number of audio channels.

Version History

Introduced in R2012a