(old)Puppy Linux Discussion Forum

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cat /proc/asound/card1/stream0 | grep Momentary

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  Momentary freq = 44098 Hz (0x5.8320)

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#!/bin/bash

# if this is the first run, EMU-rate does not exist,create it
if [ ! -f /dev/shm/EMU-rate ]; then 	# file does not exist
    echo "00" > /dev/shm/EMU-rate
fi


while : ; do
	mpc idle
	# stuff below executes when mpc is not idle

	sleep 0.4 # wait for actual track to start playing (fist 0,4 sec., to determine the sample rate)
	old_rate=$(cat /dev/shm/EMU-rate)
	# echo "old rate:$old_rate"
	sRateStr=$(cat /proc/asound/card1/stream0 | grep Momentary)
	# echo "full line: " $sRateStr
	cur_rate=${sRateStr:21:2} # here we get just the first two digits (44, 48, 96, etc.)
	# echo "cur rate:$cur_rate"
	# if $cur_rate is empty, next iteration ("continue")
	if [ -z "$cur_rate" ] # string is empty
	then
	  # echo "No song playing"
	  continue  # $cur_rate is null/empty, nothing to do, wait for next iteration
	fi

	# echo "Track sample rate: $cur_rate"
	if [ "$old_rate" = "$cur_rate" ]
	then
	  # echo "The rates are the same"
	  continue # rates are the same, nothing to do, wait for next iteration
	fi

	# here we actually compare rates and take appropriate action (change EMU clock rate using "amixer")
	# E-MU 0404 is visible as "card 1" on my system, i.e. it needs switch "-c1" for manipulation

	case $cur_rate in
	44)
	amixer -c1 set 'Clock rate Selector' 0
	echo "$cur_rate" > /dev/shm/EMU-rate
	continue
	;;
	48)
	amixer -c1 set 'Clock rate Selector' 1
	echo "$cur_rate" > /dev/shm/EMU-rate
	continue
	;;
	88)
	amixer -c1 set 'Clock rate Selector' 2
	echo "$cur_rate" > /dev/shm/EMU-rate
	continue
	;;
	96)
	amixer -c1 set 'Clock rate Selector' 3
	echo "$cur_rate" > /dev/shm/EMU-rate
	continue
	;;
	17)
	amixer -c1 set 'Clock rate Selector' 4
	echo "$cur_rate" > /dev/shm/EMU-rate
	continue
	;;
	19)
	amixer -c1 set 'Clock rate Selector' 5
	echo "$cur_rate" > /dev/shm/EMU-rate
	continue
	;;
	esac 	

	echo "$cur_rate" > /dev/shm/EMU-rate

done

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Clock rate      Sample rate    "/dev/shm/EMU-rate" 
  setting                          shorthand code
    0               44100                44
    1               48000                48
    2               88200                88
    3               96000                96
    4              176400                17
    5              192000                19