From 52b2bde9b4f6de9c0a554318846ec028ccc3c616 Mon Sep 17 00:00:00 2001
From: Trek Hopton <trekhopton@gmail.com>
Date: Wed, 14 Feb 2024 16:08:49 +1030
Subject: [PATCH] exp/i2s: loop recording 30 mins to file

---
 exp/i2s/main.go | 80 +++++++++++++++++++++----------------------------
 1 file changed, 34 insertions(+), 46 deletions(-)

diff --git a/exp/i2s/main.go b/exp/i2s/main.go
index 80bcc7c6..368ee1f4 100644
--- a/exp/i2s/main.go
+++ b/exp/i2s/main.go
@@ -1,7 +1,6 @@
 package main
 
 import (
-	"fmt"
 	"log"
 	"os"
 	"time"
@@ -10,29 +9,14 @@ import (
 	yalsa "github.com/yobert/alsa"
 )
 
-const i2sDevName = 	
+const i2sDevName = "simple-card_codec_link snd-soc-dummy-dai-0"
 
 func main() {
 	// Set capture type.
-	var i string
-	var i2s bool
-	fmt.Printf("Force I2S recording? (y/n): ")
-	fmt.Scan(&i)
-	if i == "y" {
-		i2s = true
-	} else {
-		i2s = false
-	}
+	var i2s bool = true
 
 	// Set recording length.
-	var duration time.Duration
-	var err error
-	fmt.Printf("Recording time: ")
-	fmt.Scan(&i)
-	duration, err = time.ParseDuration(i)
-	if err != nil {
-		duration = 5 * time.Second
-	}
+	var duration time.Duration = 30 * time.Minute
 
 	// Find devices.
 	cards, err := yalsa.OpenCards()
@@ -119,36 +103,40 @@ func main() {
 		return
 	}
 
-	buf := dev.NewBufferDuration(duration)
-	log.Println("recording for:", duration)
-	err = dev.Read(buf.Data)
-	if err != nil {
-		log.Println("Failed to read:", err)
-		return
-	}
-	log.Println("Recording stopped.")
+	// Record audio.
+	for {
+		buf := dev.NewBufferDuration(duration)
+		log.Println("recording for:", duration)
+		err = dev.Read(buf.Data)
+		if err != nil {
+			log.Println("Failed to read:", err)
+			return
+		}
+		log.Println("Recording stopped.")
 
-	file, err := os.Create("audio.wav")
-	if err != nil {
-		log.Println("failed to create file:", err)
-		return
-	}
-	defer file.Close()
+		fileName := "audio-" + time.Now().Format("2006-01-02_15-04-05") + ".wav"
+		file, err := os.Create(fileName)
+		if err != nil {
+			log.Println("failed to create file:", err)
+			return
+		}
+		defer file.Close()
 
-	var audio wav.WAV
-	audio.Metadata = wav.Metadata{Channels: 2, AudioFormat: wav.PCMFormat, SampleRate: 44100, BitDepth: 16}
-	_, err = audio.Write(buf.Data)
-	if err != nil {
-		log.Println("Failed to encode wav:", err)
-		return
-	}
+		var audio wav.WAV
+		audio.Metadata = wav.Metadata{Channels: 2, AudioFormat: wav.PCMFormat, SampleRate: 44100, BitDepth: 16}
+		_, err = audio.Write(buf.Data)
+		if err != nil {
+			log.Println("Failed to encode wav:", err)
+			return
+		}
 
-	_, err = file.Write(audio.Audio)
-	if err != nil {
-		log.Println("failed to write audio:", err)
-		return
-	}
+		_, err = file.Write(audio.Audio)
+		if err != nil {
+			log.Println("failed to write audio:", err)
+			return
+		}
 
-	log.Println("Audio saved to audio.wav")
+		log.Println("Audio saved to audio.wav")
+	}
 
 }