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