mirror of https://github.com/thesofproject/sof.git
111 lines
4.2 KiB
Markdown
111 lines
4.2 KiB
Markdown
##ALSA Plugin
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The SOF ALSA plugin allows SOF topologies to be run on the host. The plugin
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is still WIP with many rough edges that need refined before production
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deployment, however the plugin is usable today as a rapid development
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framework for SOF infrastructure and processing.
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#Features
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* aplay & arecord usage working today
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* alsamixer & amixer usage not working today
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* modules are loaded as SO shared libraries.
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* topology is parsed by the plugin and pipelines associated with the requested PCM ID are loaded
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* pipelines run as individual userspace threads
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* pipelines can be pinned to efficency cores
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* pipelines can use realtime priority.
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* alsa sink and alsa source modules available.
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* pipelines can block (non blocking and mmap todo)
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#License
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Code is a mixture of LGPL and BSD 3c.
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#Usage
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Please build as cmake project, for IPC4 (functional)
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IPC3 is not functional and not supported
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```
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cd sof
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cmake -GNinja -B build-plugin/ -S tools/plugin/
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# Build external projects first to avoid build race condition
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# Dropping -GNinja is another (very slow) option.
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cmake --build build-plugin/ -- sof_ep parser_ep
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cmake --build build-plugin/
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```
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then (use default ALSA prefix atm)
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```
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sudo cmake --install build-plugin/
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Make sure to set the LD_LIBRARY_PATH to include directory where the SOF modules are installed
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Ex: "~/work/sof/sof/build_plugin/sof_ep/install/lib:~/work/sof/sof/build_plugin/modules/"
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And set the environment variable SOF_PLUGIN_TOPOLOGY_PATH to point to the directory containing the topology binary
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```
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Code can then be run by starting sof-pipe with your desired topology (Ex: sof-plugin.tplg)
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```
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./sof-pipe -T sof-plugin.tplg
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```
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At this point the sof-pipe daemon is waiting for IPC. Audio applications can now invoke sof-pipe processing via
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```
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aplay -Dsof:plugin:1:default:default:48k2c16b -f dat some48kHz.wav
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```
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The command line is parsed as follows:
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- "sof" is the plugin name
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- "tgl-nocodec" is the topology name. The "sof-" prefix and ".tplg" suffix will be appended by the plugin
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- "1" is the PCM ID for render/capture
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- "default": The first default is the card name
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- "default": The second default is the device name
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- "48k2c16b" is the config name for 48K, stereo, 16bit
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This renders audio to the sof-pipe daemon using the tgl-nocodec topology playback PCM ID 1.
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The above example needs to be 48k as example pipe has no SRC/ASRC.
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Likewise
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```
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arecord -Dsof:plugin:1:default:default:48k2c16b -f dat file.wav
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```
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Will record audio using the plugin topology and PCM ID 1.
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Mixer settings can be adjusted for bdw-nocodec by (Not functional yet)
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```
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alsamixer -Dsof:tgl-nocodec:1
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```
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# Instructions for testing OpenVino noise suppression model with the SOF plugin:
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1. Fetch the model from the Open Model zoo repository ex: noise-suppression-poconetlike-0001.xml
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https://docs.openvino.ai/archive/2023.0/omz_demos.html#build-the-demo-applications-on-linux
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2. Source OpenVino environment and get OpenCV
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https://www.intel.com/content/www/us/en/developer/tools/openvino-toolkit-download.html
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3. Worth building and running the demo noise suppression application in the open model zoo
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repository to make sure OpenVino and OpenCV are configured properly.
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4. Set environment variable NOISE_SUPPRESSION_MODEL_NAME to point to the model file
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```
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export NOISE_SUPPRESSION_MODEL_NAME="~/open_model_zoo/demos/noise_suppression_demo/cpp/intel/noise-suppression-poconetlike-0001/FP16/noise-suppression-poconetlike-0001.xml"
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```
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5. Enable noise suppression by setting NOISE_SUPPRESSION=true in the tplg-targets for the sof-plugin topology
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6. Start capture using the following command. This uses the 16K capture from the DMIC from
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PCM hw device 0,7. Currently, only 16K capture is supported but in the future this will be expanded
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to work with 48K capture.
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```
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arecord -Dsof:plugin:1:0:7:16k2c16b -f dat -r 16000 --period-size=2048 file_ns_16k.wa
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```
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#TODO Items (and T-shirt size) for single pipeline E2E audio
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* IPC4 support in tplg parser (M)
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* IPC4 support in plugin (pipe/ipc4.c) (M)
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* Fix ALSA -Dhw: device support (S), currently only default ALSA device works
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* Deprecate POSIX message queues for IPC and use UNIX sockets.(S)
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* Make better build system for modules i.e. remove hack-install.sh (S)
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* Need a simpler aplay/arecord cmd line.
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