Fix iOS 16 crash

Incorporate changes from PR tanhakabir#175 (Kuama-IT:fix-ios-16-crash)
tanhakabir@97a9bf6

Only bring over code changes, not whitespace
Unsure if max() -> min() change in totalPredictedPacketCount is necessary, but kept it just in case

Author: micahjon

Source/Engine/AudioStreamEngine.swift

@@ -203,6 +203,9 @@ class AudioStreamEngine: AudioEngine {
     }
 
     private func pollForNextBufferRecursive() {
+        if(!converter.initialized) {
+            return
+        }
         do {
             var nextScheduledBuffer: AVAudioPCMBuffer! = try converter.pullBuffer()
             numberOfBuffersScheduledFromPoll += 1

Source/Engine/Converter/AudioConverter.swift

@@ -35,6 +35,7 @@ import AudioToolbox
 
 protocol AudioConvertable {
     var engineAudioFormat: AVAudioFormat {get}
+    var initialized:Bool {get}
 
     init(withRemoteUrl url: AudioURL, toEngineAudioFormat: AVAudioFormat, withPCMBufferSize size: AVAudioFrameCount) throws
     func pullBuffer() throws -> AVAudioPCMBuffer
@@ -74,6 +75,11 @@ class AudioConverter: AudioConvertable {
 
     //Field
     var converter: AudioConverterRef? //set by AudioConverterNew
+
+    public var initialized:Bool {
+        converter != nil
+    }
+
     var currentAudioPacketIndex: AVAudioPacketCount = 0
 
     // use to store reference to the allocated buffers from the converter to properly deallocate them before the next packet is being converted

Source/Engine/Converter/AudioConverterListener.swift

@@ -80,15 +80,14 @@ func ConverterListener(_ converter: AudioConverterRef, _ packetCount: UnsafeMuta
     ioData.pointee.mBuffers.mDataByteSize = UInt32(packetByteCount)
 
     selfAudioConverter.converterBuffer = ioData.pointee.mBuffers.mData
-    
-    if let lastDescription = selfAudioConverter.converterDescriptions {
-        lastDescription.deallocate()
-    }
-    
+
     // Handle packet descriptions for compressed formats (MP3, AAC, etc)
     let fileFormatDescription = fileAudioFormat.streamDescription.pointee
     if fileFormatDescription.mFormatID != kAudioFormatLinearPCM {
         if outPacketDescriptions?.pointee == nil {
+            if let lastDescription = selfAudioConverter.converterDescriptions {
+                lastDescription.deallocate()
+            }
             outPacketDescriptions?.pointee = UnsafeMutablePointer<AudioStreamPacketDescription>.allocate(capacity: 1)
         }
         outPacketDescriptions?.pointee?.pointee.mDataByteSize = UInt32(packetByteCount)

Source/Engine/Parser/AudioParser.swift

@@ -97,7 +97,7 @@ class AudioParser: AudioParsable {
         let predictedCount = AVAudioPacketCount(Double(sizeOfFileInBytes) / bytesPerPacket)
 
         guard networkProgress != 1.0 else {
-            return max(AVAudioPacketCount(audioPackets.count), predictedCount)
+            return min(AVAudioPacketCount(audioPackets.count), predictedCount)
         }
 
         return predictedCount