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In the same vein as the terminal and block I/O controls, the sound controls are implemented via poperty files and match the OSS API ([1] features a nice overview while [2] is v3 and [3] gives in-depth information on the current v4.x API we eventually might want to implement). [1] https://wiki.freebsd.org/RyanBeasley/ioctlref/ [2] http://www.opensound.com/pguide/oss.pdf [3] http://manuals.opensound.com/developer/ The controls currently implemented are the ones used by the cmus OSS output plugin, which was the driving factor behind the implementation. It uses the obsolete (v3) API and does not check if the requested parameter was actually set, which should be done according to the official OSS documentation. At the moment it is not possible to set or rather change any parameters. In case the requested setting differs from the parameters of the underlying Audio_out session - in contrast to the suggestion in the OSS manual - we do not silently adjust the parameters returned to the callee but outright fail the I/O control operation. The following list contains all currently handled I/O controls. * SNDCTL_DSP_CHANNELS sets the number of channels. We return the available channels here and return ENOTSUP if it differs from the requested number of channels. * SNDCTL_DSP_GETOSPACE returns amount of playback data that can be written without blocking. For now it amounts the space left in the Audio_out packet-stream. * SNDCTL_DSP_POST forces playback to start. We do nothing and return success. * SNDCTL_DSP_RESET is supposed to reset the device when it is active before any parameters are changed. We do nothing and return success. * SNDCTL_DSP_SAMPLESIZE sets the sample size. We return the sample size of the underlying Audio_out session and return ENOTSUP if it differs from the requested number of channels. * SNDCTL_DSP_SETFRAGMENT sets the buffer size hint. We ignore the hint and return success. * SNDCTL_DSP_SPEED sets the samplerate. For now, we always return the rate of the underlying Audio_out session and return ENOTSUP if it differs from the requested one. This commit serves as a starting point for further implementing the OSS API by exploring more users, e.g. as VirtualBox/Qt5/SDL2 audio backend or a more sophisticated progam like sndiod. Issue #3891. |
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base | ||
base-fiasco | ||
base-foc | ||
base-hw | ||
base-linux | ||
base-nova | ||
base-okl4 | ||
base-pistachio | ||
base-sel4 | ||
dde_bsd | ||
dde_ipxe | ||
dde_linux | ||
dde_rump | ||
demo | ||
gems | ||
hello_tutorial | ||
libports | ||
os | ||
ports | ||
README |
=============================== Genode source-code repositories =============================== This directory contains the source-code repositories of the Genode OS Framework. Each sub directory has the same principle layout as described in the build-system manual: :Build-system manual: [https://genode.org/documentation/developer-resources/build_system] The build system uses a configurable selection of those reposities to obtain the source codes for the build process. The repositories are not independent but build upon of each other: :'base': This directory contains the source-code repository of the fundamental frameworks and interfaces of Genode. Furthermore, it contains the generic parts of core. :'base-<platform>': These directories contain platform-specific source-code repositories complementing the 'base' repository. The following platforms are supported: :'linux': Linux kernel (both x86_32 and x86_64) :'nova': NOVA hypervisor developed at University of Technology Dresden See [https://genode.org/documentation/platforms/nova] :'foc': Fiasco.OC is a modernized version of the Fiasco microkernel with a completely revised kernel interface fostering capability-based security. It is not compatible with L4/Fiasco. See [https://genode.org/documentation/platforms/foc] :'hw': The hw platform allows the execution of Genode on bare ARM and x86 hardware without the need for a separate kernel. The kernel functionality is included in core except in the special case of the Muen separation kernel. See [https://genode.org/documentation/platforms/hw] and [https://genode.org/documentation/platforms/muen] :'okl4': OKL4 kernel (x86_32 and ARM) developed at Open-Kernel-Labs. See [https://genode.org/documentation/platforms/okl4] :'pistachio': L4ka::Pistachio kernel developed at University of Karlsruhe. See [https://genode.org/documentation/platforms/pistachio] :'fiasco': L4/Fiasco kernel developed at University of Technology Dresden. See [https://genode.org/documentation/platforms/fiasco] :'sel4': seL4 microkernel developed at NICTA/General Dynamics See[https://sel4.systems/] :'os': This directory contains the non-base OS components such as the init process, device drivers, and basic system services. :'demo': This directory contains the source-code repository of various services and applications that we use for demonstration purposes. For example, a graphical application launcher called Launchpad and the Scout tutorial browser. :'hello_tutorial': Tutorial for creating a simple client-server scenario with Genode. This repository includes documentation and the complete source code. :'libports': This source-code repository contains ports of popular open-source libraries to Genode, most importantly the C library. The repository contains no upstream source code but means to download the code and adapt it to Genode. For instructions about how to use this mechanism, please consult the README file at the top level of the repository. Among the 3rd-party libraries are Qt5, libSDL, freetype, Python, ncurses, Mesa, and libav. :'dde_linux': This source-code repository contains the device driver environment for executing Linux device drivers natively on Genode. Currently, this repository hosts the USB stack. :'dde_ipxe': This source-code repository contains the device-driver environment for executing drivers of the iPXE project. :'dde_bsd': This source-code repository contains the device-driver environment for drivers of the OpenBSD operating system. :'dde_rump': This source-code repository contains the port of rump kernels, which are used to execute subsystems of the NetBSD kernel as user level processes. The repository contains a server that uses a rump kernel to provide various NetBSD file systems to Genode. :'ports': This source-code repository hosts ports of 3rd-party applications to Genode. The repository does not contain upstream source code but provides a mechanism for downloading the official source distributions and adapt them to the Genode environment. The used mechanism is roughly the same as used for the 'libports' repository. Please consult 'libports/README' for further information. :'gems': This source-code repository contains Genode applications that use both native Genode interfaces as well as features of other high-level repositories, in particular shared libraries provided by 'libports'.