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Chapter 10. Audio - NetBSD
https://www.netbsd.org/docs/guide/en/chap-audio.html#:~:text=In%20NetBSD%2C%20mixerctl%281%29%20is%20used%20to%20adjust%20audio,-w%20outputs.master%3D50%20List%20the%20available%20controls%20and%20settings%3A
Chapter 10. Audio - NetBSD
https://www.netbsd.org/docs/guide/en/chap-audio.html
In NetBSD, mixerctl (1) is used to adjust audio mixing, e.g. volume for recording and playback, and the sources and sinks currently in use. Set the current playback volume: $ mixerctl -w outputs.master=50. List the available controls and settings:
audio(4) - NetBSD Manual Pages
https://man.netbsd.org/NetBSD-9.2/audio.4
On either type of device, opening with write mode will start in playback mode, opening with read mode will start in recording mode. If the playback mode is paused then silence is played instead of the pro- vided samples, and if recording is paused then the process blocks in read (2) until recording is unpaused.
audio(4) - NetBSD Manual Pages
https://man.netbsd.org/NetBSD-8.0/audio.4
AUDIO_SETCHAN (int) This command will select the audio channel for subsequent ioctl calls. AUDIO_FLUSH This command stops all playback and recording, clears all queued buffers, resets error counters, and restarts recording and play- back as appropriate for the current sampling mode.
NetBSD Blog
https://blog.netbsd.org/tnf/entry/improving_libossaudio_and_the_future
The NetBSD kernel supports between 1 and 12 channels for audio playback. Most commonly 1 is mono, 2 is stereo, and higher numbers are used with surround sound systems. The limit of 12 comes from the USB audio device specification.
HDMI/DP Audio output on NetBSD - UnitedBSD
https://www.unitedbsd.com/d/450-hdmidp-audio-output-on-netbsd
[ 1.014442] audio1: slinear_le:16 8ch 48000Hz, blk 7680 bytes (10ms) for playback [ 1.014442] audio1: slinear_le:16 2ch 48000Hz, blk 1920 bytes (10ms) for recording [ 1.014442] spkr1 at audio1: PC Speaker (synthesized) # mixerctl -a. outputs.master=100,100 inputs.reclvl=92,92 inputs.reclvl.mute=on inputs.record=184,184 inputs.record.mute=on
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