Changes between Version 2 and Version 3 of ventana/audio

Timestamp:

06/30/2020 07:08:52 PM (4 years ago)

Author:

Tim Harvey

Comment:

updated examples to determine card number for sgtl5000audio device

ventana/audio

@@ -26 +26 @@
 ==== Line Level Audio Output
 common {{{amixer}}} settings for Analog audio output (make sure to look at {{{/proc/asound/cards}}} to find the correct device number to use with the -c option below):
+ * Determine Device number:
+{{{#!bash
+# cat /proc/asound/cards
+ 0 [DWHDMI         ]: dw-hdmi-ahb-aud - DW-HDMI
+                      DW-HDMI rev 0x0a, irq 22
+ 1 [sgtl5000audio  ]: sgtl5000-audio - sgtl5000-audio
+                      sgtl5000-audio
+ 2 [tda1997xaudio  ]: tda1997x-audio - tda1997x-audio
+                      tda1997x-audio
+# card=$(cat /proc/asound/cards | grep sgtl5000audio | awk '{ print $1}')
+}}}
+  - the above output shows that device '0' is HDMI out, device '1' is analog audio in/out, and device '2' is HDMI audio in. This device numbering can change from kernel to kernel depending on driver init order so we use grep and awk to get the card number for the 'sgtl5000audio' device
  * Output (Line out)
 {{{#!bash
+# get card number for sgtl5000audio device
+card=$(cat /proc/asound/cards | grep sgtl5000audio | awk '{ print $1}')
 # unmute output
-amixer -c 0 sset Lineout on
+amixer -c $card sset Lineout on
 # set output level to max
-amixer -c 0 sset PCM 100%
+amixer -c $card sset PCM 100%
 }}}
  * Input (Line in)
 {{{#!bash
+# get card number for sgtl5000audio device
+card=$(cat /proc/asound/cards | grep sgtl5000audio | awk '{ print $1}')
 # set capture mux
-amixer -c 0 sset "Capture Mux" LINE_IN
-amixer -c 0 sset "Line In Function" on
+amixer -c $card sset "Capture Mux" LINE_IN
+amixer -c $card sset "Line In Function" on
 # set capture gain
-amixer -c 0 sset "Capture" 8
+amixer -c $card sset "Capture" 8
 # enable it
-amixer -c 0 sset "Capture" cap
+amixer -c $card sset "Capture" cap
 }}}
 
@@ -52 +68 @@
 common {{{amixer}}} settings for headphone level audio:
 {{{#!bash
+# get card number for sgtl5000audio device
+card=$(cat /proc/asound/cards | grep sgtl5000audio | awk '{ print $1}')
 # Set zero cross detect gain
-amixer -c 0 sset Headphone Playback ZC 60%
+amixer -c $card sset Headphone Playback ZC 60%
 # unmute output
-amixer -c 0 sset Headphone on
+amixer -c $card sset Headphone on
 # set output level to max
-amixer -c 0 sset PCM 100%
+amixer -c $card sset PCM 100%
 }}}