From: Christian Heller <c.heller@plomlompom.de> Date: Wed, 24 Feb 2021 01:02:23 +0000 (+0100) Subject: For Raspbian setup, add ALSA config. X-Git-Url: https://plomlompom.com/repos/%7B%7B%20web_path%20%7D%7D/%7B%7Bprefix%7D%7D/%7B%7Bdb.prefix%7D%7D/foo.html?a=commitdiff_plain;h=41bfb6062fb9c80113a1cebf1557cbae81c91fcd;p=config For Raspbian setup, add ALSA config. --- diff --git a/.asoundrc b/.asoundrc new file mode 100644 index 0000000..46eb301 --- /dev/null +++ b/.asoundrc @@ -0,0 +1,73 @@ +# using hdmi0 for TV stereo, hdmi1 for a 5.1 speaker set-up +# unfortunately, a non-square speaker number creates some noise +# therefore for hdmi1 we declare 8 speakers, but re-map them to 6 speakers +pcm.hdmi0 { + type hw + card 0 +} +pcm.hdmi1 { + type route + slave { + pcm "hw:1,0" + channels 8 + } + ttable { + 0.0 = 1 + 1.1 = 1 + 2.2 = 1 + 3.3 = 1 + 4.4 = 1 + 5.5 = 1 + 6.0 = 0.5 + 6.2 = 0.5 + 7.1 = 0.5 + 7.3 = 0.5 + } +} + +# upmix stereo to 5.1 â so we can watch stereo YouTube on all speakers +# with this: $ chromium-browser --alsa-output-device=stereo51 +# (numbers taken from <https://www.volkerschatz.com/noise/alsa.html>) +pcm.stereo51 { + type route + slave { + pcm "hw:1,0" + channels 8 + } + ttable { + 0.0 = 1 + 0.2 = -0.6 + 0.3 = -0.39 + 0.4 = 0.5 + 0.5 = 0.5 + 1.1 = 1 + 1.2 = -0.6 + 1.3 = -0.39 + 1.4 = 0.5 + 1.5 = 0.5 + } +} + +# default to hdmi0, overwrite with AUDIO_HDMI=1 env prefix +pcm.!default { + type plug + slave.pcm { + @func concat + strings [ + "hdmi" + { + @func getenv + vars [ AUDIO_HDMI ] + default "0" + } + ] + } +} +ctl.!default { + type hw + card { + @func getenv + vars [ AUDIO_HDMI ] + default 0 + } +}