AAC | ADPCM | Convolution | DAFx | FFT | IIR | Mixer | MP3 | MPEG | MPEG-4

HI all,
   I am studying the libmad code for mp3 decoder and I
have a doubt in the file “synth.h”. I could not
understand the “filter” element of the structure
“mad_synth”. 

  It says...

  struct mad_synth {
  mad_fixed_t filter[2][2][2][16][8];   /* polyphase
filterbank outputs */
                                        /*
[ch][eo][peo][s][v] */

  unsigned int phase;                   /* current
processing phase */

  struct mad_pcm pcm;                   /* PCM output
*/
};

I don't understand the meaning of the array indices
[ch][eo][peo][s][v]. I will be thankful if anybody can
help me with this.

 Thanks and  regards,
  Karthika.

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