Simple ALSA topology playground for Gordon Peak MRB with SOF

The purpose of this repo is messing around with SOF on the gp-mrb board and try different widgets and topology configurations. The sof topology framework currently includes the following predefined pipelines for playback:

• pipe-passthrough-playback.m4

  PCM --> B0 --> DAI
  

• pipe-volume-playback.m4

  PCM --> B0 --> Volume 0 --> B1 --> DAI
  

• pipe-eq-fir-volume-playback.m4

  PCM --> B0 --> EQ FIR 0 --> B1 --> Volume 0 --> B2 --> DAI
  

• pipe-eq-iir-volume-playback.m4

  PCM --> B0 --> EQ IIR 0 --> B1 --> Volume 0 --> B2 --> DAI
  

• pipe-eq-volume-playback.m4

  PCM --> B0 --> EQ IIR 0 --> B1  --> EQ FIR 0 --> B2 --> Volume 0 --> B3 --> DAI
  

• pipe-src-playback.m4

  PCM --> B0 --> SRC 0 --> B1 Volume 0 --> B2 --> DAI
  

• pipe-pcm-media.m4

  PCM --B0--> volume(0P) --B1--> SRC -- B2 --> EndPoint Pipeline
  

• pipe-tone.m4

  Tone --B0--> volume --B1--> Endpoint Pipeline
  

• pipe-low-latency-playback.m4

  PCM --B0--> volume(0P) --B1--+
                               |--ll mixer(M) --B2--> volume(LL) ---B3-->  DAI
              pipeline n+1 >---+
                               |
              pipeline n+2 >---+
                               |
              pipeline n+3 >---+  .....etc....more pipes can be mixed here
  

• pipe-asrc-playback.m4

  PCM --> B0 --> ASRC --> B1 --> DAI
  

• pipe-amp-volume-playback.m4

  PCM --> B0 --> Amp -> B1 -> Volume 0 --> B2 --> DAI
  

And some others.