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@@ -11,95 +11,6 @@ A sample dummy Audio Path is provided as an example to show how a low-level audi Currently, the Fiberdyne DSP hardmixer is supported on the Renesas R-Car M3 AGL reference platform, and a default loopback softmixer is in development. -## Building - -### Out Of Tree - -The kernel modules can be built either in-tree, or out-of-tree. -To build both AVIRT and the dummy Audio Path out-of-tree, use the following command: - -```sh -$ make all -``` - -If building for [AGL](http://docs.automotivelinux.org/), use the [XDS](http://docs.automotivelinux.org/docs/devguides/en/dev/reference/xds/part-1/0_Abstract.html) build system together with the `make_agl.sh` script: - -```sh -$ ./make_agl.sh ${XDS_SDK_ID} -``` - -### In tree - -To build in tree, use the [Fiberdyne Linux fork](https://github.com/fiberdyne/linux), which will automatically clone the AVIRT Driver and required AudioPath modules to the `drivers/staging` directory. You can then turn AVIRT Support on by setting to `<M>`. The drivers can be found here: - -``` -$ make menuconfig - -# Navigate to: Device Drivers--->Staging Drivers--->AVIRT Support -``` - -Finally build the kernel with the configuration selected by making. - -``` -$ make -``` - -## Running - -Firstly, install the resulting kernel modules to the appropriate modules -directory, and run`depmod`. For example, in AGL: - -```sh -cp avirt_core.ko avirt_dummyap.ko /lib/modules/4.14.0-yocto-standard/ -depmod -``` - -Now we can load the modules: - -```sh -modprobe avirt_core -modprobe avirt_dummyap -``` - -We must now configure AVIRT. We can do this with the test script: - -```sh -source scripts/test_configfs.sh -``` - -We can see the newly created streams by using the `aplay` utility. For example: - -```sh -aplay -l -... -card 2: avirt [avirt], device 0: multimedia [multimedia] - Subdevices: 1/1 - Subdevice #0: subdevice #0 -card 2: avirt [avirt], device 1: navigation [navigation] - Subdevices: 1/1 - Subdevice #0: subdevice #0 -card 2: avirt [avirt], device 2: emergency [emergency] - Subdevices: 1/1 - Subdevice #0: subdevice #0 -``` - -## 4A Integration - -AVIRT has been integrated with [4a-softmixer](https://github.com/iotbzh/4a-softmixer) -and [4a-hal-generic](https://github.com/iotbzh/4a-hal-generic) to provide a smooth -transition from the existing aloop implementation to the future AVIRT loopback implementation. - -### User-space Library - -The user-space library [libavirt](https://github.com/fiberdyne/libavirt) can be used to configure AVIRT from within a given AGL 4A binding. - -### Hardmixer - -A new 4A mixer binding has been developed to demonstrate the capabilities of the -Fiberdyne DSP mixer operating on the HiFi2 core on-board the Renesas R-Car M3 M3ULCB -AGL reference platform. This is called the 'hardmixer', and is a faster, lower -latency alternative to the softmixer. - ## TODO - Currently, playback only - implementing capture is WIP. |