On Tue, 2020-05-19 at 16:06 +0000, Daniel Baluta wrote:

Hello everyone,

Is there any topology that mixes two PCM streams that we can take as an example to start with?

We would like to do something like this:

PCM0 ----> volume ----------------+ |-- LL mixer ----> volume ---->DAI PCM1 ----> volume ----> SRC --+

Also, should this result in 1 sound card with 2 sub devices, right?

Hi Daniel,

We already have a pipeline similar to this that we use in our topologies. Take for example sof-apl-pcm512x.m4. It uses the "pipe-low-latency-playback" pipeline for PCM0 pipeline 1 and the "pipe-pcm-media" pipeline (pipeline 5) is connected to the mixer in pipeline 1. Hope this helps.

Is there a plan to write a topology GUI tool? Writing m4 files is not really easy 🙂.

We dont have a GUI yet for writing topologies but there's a tool to visualize the topologies that you build with m4 for now.

THanks, Ranjani

________________________________ From: Sound-open-firmware sound-open-firmware-bounces@alsa-project.org on behalf of Daniel Baluta daniel.baluta@gmail.com Sent: Thursday, May 21, 2020 1:31 AM To: Ranjani Sridharan ranjani.sridharan@linux.intel.com Cc: xiuli.pan@linux.intel.com xiuli.pan@linux.intel.com; yang.jie@linux.intel.com yang.jie@linux.intel.com; Terry Lv terry.lv@nxp.com; Girdwood, Liam R liam.r.girdwood@intel.com; Daniel Baluta daniel.baluta@nxp.com; sound-open-firmware@alsa-project.org sound-open-firmware@alsa-project.org Subject: Re: [Sound-open-firmware] Question about topology with mixer

On Tue, May 19, 2020 at 7:17 PM Ranjani Sridharan ranjani.sridharan@linux.intel.com wrote:

On Tue, 2020-05-19 at 16:06 +0000, Daniel Baluta wrote:

...

Hello everyone,

Is there any topology that mixes two PCM streams that we can take as an example to start with?

We would like to do something like this:

PCM0 ----> volume ----------------+ |-- LL mixer ----> volume ---->DAI PCM1 ----> volume ----> SRC --+

Also, should this result in 1 sound card with 2 sub devices, right?

Hi Daniel,

We already have a pipeline similar to this that we use in our topologies. Take for example sof-apl-pcm512x.m4. It uses the "pipe-low-latency-playback" pipeline for PCM0 pipeline 1 and the "pipe-pcm-media" pipeline (pipeline 5) is connected to the mixer in pipeline 1. Hope this helps.

...

Is there a plan to write a topology GUI tool? Writing m4 files is not really easy .

We dont have a GUI yet for writing topologies but there's a tool to visualize the topologies that you build with m4 for now.

Care to share the name of the tool or some links to it? :)

Hi Daniel,

The verify-tplg-binary.sh test in the CI test suite does this today. If you look into the CI test result (click on PASS), you'll see the tab there it displays the tplg graph. https://sof-ci.01.org/linuxpr/PR2129/build3803/devicetest/ So, the script should give you the info about how to use the tool.

Thanks, Ranjani