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adding conts and comments

This commit is contained in:
Ella Pietraroia 2020-02-26 12:30:34 +10:30
parent 5edb9a08e6
commit a1c856e567
1 changed files with 27 additions and 15 deletions
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42
cmd/audio-player/looper/main.go
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@ -27,13 +27,13 @@ LICENSE
/*
Pi Setup:
pull master
$sudo nano main.go
chage file variable at top of function to be wav file that you have put onto the pi (hint: spc command)
navigate to /go/src/bitbucket.org/ausocean/av/cmd/audio-player/looper
$sudo nano main.go
chage file variable at top of function to be wav file that you have put onto the pi (hint: spc command to put a new file on the pi)
and build
edit rc.local to run looper at boot
$sudo nano /etc/rc.local
paste this in after comments but before 'exit 0':
paste this in after comments but before 'exit 0': -----------------------------------------------------------
exec 2> /tmp/rc.local.log # send stderr from rc.local to a log file
exec 1>&2 # send stdout to the same log file
@ -44,9 +44,18 @@ AUDIOPATH=/home/pi/go/src/bitbucket.org/ausocean/av/cmd/audio-player/looper
cd $AUDIOPATH
./looper &
-----------------------------------------------------------------------------------------------------------------
$systemctl enable rc-local
$sudo systemctl start rc-local.service
after starting the service the looping should start straight away
Useful commands:
$cat /tmp/rc.local.log
$sudo systemctl status rc-local.service
$cat audio.log (in looper directory)
On computer
$scp something.wav pi@192.168.1.106:/home/pi
*/
package main
@ -62,24 +71,27 @@ import (
)
func main() {
file := "48khz.wav" //"5mStartToEndOfTrials.wav"
soundFile := "48khz.wav" //"5mStartToEndOfTrials.wav"
soundcardPath := "/usr/share/doc/audioInjector/asound.state.RCA.thru.test"
logFile := "audio.log"
//making log file
_, err := os.Stat("audio.log")
_, err := os.Stat(logFile)
if !os.IsNotExist(err) {
err := os.Remove("audio.log")
err := os.Remove(logFile)
if err != nil {
log.Fatalf("fatal: error clearing file: %v", err)
}
}
f, err := os.OpenFile("audio.log", os.O_RDWR|os.O_CREATE, 0666) //chage to empty each time
f, err := os.OpenFile(logFile, os.O_RDWR|os.O_CREATE, 0666) //chage to empty each time
if err != nil {
log.Fatalf("fatal: error opening file: %v", err)
log.Fatalf("fatal: error opening file %s: %v", logFile, err)
}
defer f.Close()
log.SetOutput(f)
//alsactl ensures that the sound will be played through the correct soundcard
path, err := exec.LookPath("alsactl")
if err != nil {
log.Fatalf("fatal: didn't find 'alsactl' executable\n")
@ -88,12 +100,12 @@ func main() {
}
for {
cmdInit := exec.Command("alsactl", "-f", "/usr/share/doc/audioInjector/asound.state.RCA.thru.test", "restore")
cmdInit := exec.Command("alsactl", "-f", soundcardPath, "restore")
err := cmdInit.Run()
if err == nil {
break
}
log.Printf("fatal(ish): cmd.Run() for alsactl failed with '%s'\n", err)
log.Printf("fatal(ish): cmd.Run() for 'alsactl' failed with '%s'\n", err)
time.Sleep(1 * time.Second)
}
@ -108,9 +120,9 @@ func main() {
numPlays := 0
for {
numPlays++
log.Printf(" Number of times played: %d\n", numPlays)
log.Printf(" Play number: %d\n", numPlays)
cmd := exec.Command("play", file)
cmd := exec.Command("play", soundFile)
var stdoutBuf, stderrBuf bytes.Buffer
stdoutIn, _ := cmd.StdoutPipe()
@ -122,7 +134,7 @@ func main() {
err := cmd.Start()
if err != nil {
log.Fatalf("fatal: cmd.Start() failed with '%s'\n", err)
log.Fatalf("fatal: cmd.Start() for 'play' failed with '%s'\n", err)
}
var wg sync.WaitGroup
@ -138,7 +150,7 @@ func main() {
err = cmd.Wait()
if err != nil {
log.Fatalf("fatal: cmd.Run() failed with %s\n", err)
log.Fatalf("fatal: cmd.Run() for 'play' failed with %s\n", err)
}
if errStdout != nil || errStderr != nil {
log.Fatal("fatal: failed to capture stdout or stderr\n")