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Release Notes

Sound Open Firmware (SOF) is an open source audio Data Signal Processing (DSP) firmware infrastructure and SDK that offers a single code base for all Intel hardware platforms. |SOF| provides infrastructure, real-time control pieces, and audio drivers as a community project. Visit the :ref:`SOF Introduction <introduction>` for more information.

Source Code Location

All project SOF source code is maintained in the https://github.com/thesofproject repository and includes folders for SOF, SOF tools and topologies, Linux kernel, and documentation. Download the source code as a zip or tar.gz file:

$ git clone https://github.com/thesofproject/sof.git
$ cd sof
$ git checkout -b stable-1.2 origin/stable-1.2

Current Release: v1.2 (Sept 2018)

The following features are available in v1.2.

Docker availability

SOF and SDK can now be built inside a Docker container. This removes the need to install git versions of ALSA dependencies locally.

API unit tests

A unit test suite, based on the cmocka library, enables fast and reliable regression testing of the core APIs.

Intel Gemini Lake platform support

PCM playback/capture and PDM DMIC are now supported on the Intel Gemini Lake platform.

Travis CI support

The continuous integration process enhanced by builds and tests run by Travis for every code change provides immediate feedback.

DSP-to-Host DMA tracing support

A DMA tracing mechanism has been added to provide high-frequency trace output. Bandwidth for the code traces increases significantly by transmitting the data through the DSP-to-Host DMA.

Userspace application support for test benching processing algorithms

|SOF| can now be built as an x86 library that can be linked to userspace applications that can parse audio processing pipelines/topologies. This enables verifying functionality of audio components that are part of the pipeline.

Intel DMIC support on Apollo Lake and Gemini Lake

The DMIC driver has been added to support the directly-attached PDM (Pulse Density Modulation) type of digital microphones. A digital microphone's array can be connected directly to the Intel System on Chip (SoC) for minimized system power consumption and lowest delay. |SOF| topology parameters for PDM bus characteristics enable support for a wide range of microphone models and operating modes.

Xtensa HiFi SIMD optimizations

The SIMD optimizations for volume, FIR, and SCR processing components typically reduce the power consumption and execution time of algorithms processing that is similar to generic C code. Note that this requires an xt-xcc compiler.

Numerous additional stress test hardening patches

Both the stability and robustness of PCM playback/capture are greatly improved via numerous stress tests.