Initial commit

app/src/main/java/com/michatec/radio/helpers/AudioHelper.kt

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+/*
+ * AudioHelper.kt
+ * Implements the AudioHelper object
+ * A AudioHelper provides helper methods for handling audio files
+ *
+ * This file is part of
+ * TRANSISTOR - Radio App for Android
+ *
+ * Copyright (c) 2015-22 - Y20K.org
+ * Licensed under the MIT-License
+ * http://opensource.org/licenses/MIT
+ */
+
+
+package com.michatec.radio.helpers
+
+import android.util.Log
+import androidx.media3.common.Metadata
+import androidx.media3.extractor.metadata.icy.IcyHeaders
+import androidx.media3.extractor.metadata.icy.IcyInfo
+import com.michatec.radio.Keys
+import kotlin.math.min
+
+
+/*
+ * AudioHelper object
+ */
+object AudioHelper {
+
+
+    /* Define log tag */
+    private val TAG: String = AudioHelper::class.java.simpleName
+
+
+    /* Extract audio stream metadata */
+    fun getMetadataString(metadata: Metadata): String {
+        var metadataString = String()
+        for (i in 0 until metadata.length()) {
+            // extract IceCast metadata
+            when (val entry = metadata.get(i)) {
+                is IcyInfo -> {
+                    metadataString = entry.title.toString()
+                }
+
+                is IcyHeaders -> {
+                    Log.i(TAG, "icyHeaders:" + entry.name + " - " + entry.genre)
+                }
+
+                else -> {
+                    Log.w(TAG, "Unsupported metadata received (type = ${entry.javaClass.simpleName})")
+                }
+            }
+            // TODO implement HLS metadata extraction (Id3Frame / PrivFrame)
+            // https://exoplayer.dev/doc/reference/com/google/android/exoplayer2/metadata/Metadata.Entry.html
+        }
+        // ensure a max length of the metadata string
+        if (metadataString.isNotEmpty()) {
+            metadataString = metadataString.substring(0, min(metadataString.length, Keys.DEFAULT_MAX_LENGTH_OF_METADATA_ENTRY))
+        }
+        return metadataString
+    }
+
+
+}