Task: build a multimedia player

Inputs: for audio: mp3, mp4, wav, avi, and many other formats
        for video: mov, mp4, and other formats

Outputs: audio players, video players, etc.

Component tasks:

 determine file type
 file I/O (file read)
 change volume
 stop and start
 select file (use the command line for now)
 stereo balancing and basic EQ
 display basic metadata
 adjust speed
 support selection of start and end times

Data Formats:

 common formats for audio and video

Driver program:
 instantiate a player object
 decode command line arguments
 loop over all media files:
  open file
  determine the type of media
  instantiate an object of that type
  loop over data:
   read a chunk of data
   convert it to a common format
   send it an appropriate device
  end loop
  close file
 end loop

Class Design:

 MediaPlayer
 AudioSignal
  AudioSignalMP3
  AudioSignalWAV
  AudioSignalAVI

 VideoSignal

 DSP Filtering
 Linear Algebra
 Error Handler

 Common error handling

 AudioDevices
 VideoDevices