On 5/6/20 2:26 PM, Terry Lv wrote:

Hi Daniel,

I make a graph for my audio demo, could you help to review it?   My aim is to make a demo with two PCMs:

1. Warning sound.
2. Streaming music (using equalizer widget).
3. Multiplexer for both PCMs with volumn control. Priority of warning sound is higher than music.

My drafted graph is:

PCM0 ----> volume ----------------+ |--low latency mixer ----> volume ---->  SSP(WMA8960)   PCM1 ----> volume ----> SRC ----+

Also, I've some questions.

1. Is it enough to use priority in PIPELINE_PCM_ADD to reduce music volume when warning sound is ON?
2. Only mixer is used here. Is multiplexer needed here?

Hi Terry,

1) I'm not sure about this one so adding SOF mailing list.

2) I don't think you need a multiplexer.

Also, I think instead of SSP(wma8960) you want SAI(wm8960), right?

Also, why do you need SRC component?

thanks,

Daniel.