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686b9d44f4
On x86, DMA buffers are actually always mapped as cached. We should therefore actually ask for a cached buffer in order to avoid confusion. genodelabs/genode#5000 |
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| audio.list | ||
| README | ||
This repository contains device drivers ported from OpenBSD. Audio ##### The audio driver is ported from OpenBSD 7.3 and includes support for Intel HD Audio devices. The HDA driver works on real hardware and supposedly in VirtualBox. Usage and configuration ======================= You have to prepare the contrib sources for this repository by executing _./tool/ports/prepare_port dde_bsd_. Also you need to make sure to add the 'dde_bsd' repository to the REPOSITORIES variable in your 'etc/build.conf'. Reporting of the mixer state is enabled by adding the 'report_mixer' attribute to the drivers configuration and setting its value to 'yes'. The following snippets illustrates the format of the report: !<mixer_state> ! <mixer field="inputs.beep" value="108"/> ! <mixer field="outputs.hp_sense" value="plugged"/> ! <mixer field="outputs.master" value="128,128"/> ! <mixer field="outputs.mic_sense" value="unplugged"/> ! <mixer field="outputs.spkr_muters" value="hp,mic"/> !</mixer_state> The mixer state may expose other mixer fields as well, depending on the used sound card. The naming scheme of the attributes intentionally matches the naming scheme of OpenBSD's mixerctl(1) program. Each 'mixer' node can be used to configure the audio driver by using it in its configuration, e.g.: !<config report_mixer="yes"> ! <mixer field="outputs.master" value="255,255"/> !</config> This configuration will set the output volume to the highest possible value. Although it is now also possible to update the configuration at run-time it should not be done while the driver is currently playing or recording because it may provoke the generation of artefacts. The following configures the driver of playback and recording: ! <start name="audio_out_drv"> ! <resource name="RAM" quantum="8M"/> ! <provides> ! <service name="Audio_out"/> ! <service name="Audio_in"/> ! </provides> ! <config> ! <mixer field="outputs.master" value="255"/> ! <mixer field="record.enable" value="on"/> ! <mixer field="record.adc-0:1_source" value="mic3"/> ! <mixer field="record.volume" value="128"/> ! </config> ! </start> It is vital to enable recording by setting 'record.enable' to 'on' as otherwise only silence will be delievered to the Audio_in session. In addition to selecting the recording source, the playback as well as the recording volume are set. When a single value is given the same value is used for all channels. Depending on the used HDA device or rather the used codec the available fields might differ and a different recording source must be set for 'adc-0:1'. For example on a Thinkpad X220 the source must be set to 'mic3' to select the internal microphone. Information about the available mixers and settings in general may be obtained by setting the 'verbose' to 'yes' in the config node. Examples ======== Playback can be tested by executing the run script 'repos/dde_bsd/run/audio_out.run'. It will play a raw sample file in a loop. The file format is header less two channel float 32 at 44100 Hz. You may use the 'sox' utility to create such an audio file: ! sox -c 2 -r 44100 foo.wav foo.f32 Recording, on the other hand, can be tested by executing the run script 'repos/dde_bsd/run/audio_in.run'. It will use a simply audio monitor test component that records samples and plays them back immediately.