--- OniSplit/Sound/WavFile.cs	2021/05/03 15:22:15	1154
+++ OniSplit/Sound/WavFile.cs	2021/05/08 01:44:24	1156
@@ -39,7 +39,7 @@ namespace Oni.Sound
 
                 var header = new WavFile()
                 {
-                    sampleCount = 0
+                    sampleCount = -1
                 };
 
                 for (int chunkType, chunkSize, chunkStart; reader.Position < size; reader.Position = chunkStart + chunkSize)
@@ -55,8 +55,7 @@ namespace Oni.Sound
                     if (chunkType == fcc_data)
                         header.ReadDataChunk(reader, chunkSize);
                 }
-
-                header.ValidateSampleCount();
+                header.TruncatePerFact();
                 return header;
             }
         }
@@ -85,17 +84,28 @@ namespace Oni.Sound
         {
             soundData = reader.ReadBytes(chunkSize);
         }
-        private void ValidateSampleCount() // TODO: ACTUAL VALIDATION/CORRECTION
+        private void TruncatePerFact() // TODO: MORE THOROUGH VALIDATION?
         {
-            int sampleCountFromData = 0;
-            int wholeBlocks = soundData.Length / blockAlign;
-            if(sampleCount == 0) // not explicitly set (no fact chunk present)
+            if(sampleCount == -1) // not explicitly set (no fact chunk present)
             {
                 Console.WriteLine("The imported WAV file has no FACT chunk.");
             }
-            else // TODO: calculate sampleCountFromData, compare with sampleCount
+            else if (format == WavFormat.Adpcm) // calculate truncated data size
             {
-
+                var blockSizeADPCM = blockAlign;
+                var samplesPerBlock = 2 + (blockSizeADPCM - channelCount * 7) * 8 / channelCount / bitsPerSample;
+                int wholeBlocks = sampleCount / samplesPerBlock;
+                if (wholeBlocks * blockAlign > soundData.Length)
+                    Console.Error.WriteLine("Sample count exceeds the range of sound data.");
+                int leftoverSamples = sampleCount - wholeBlocks * samplesPerBlock;
+                if (leftoverSamples < 2) // a block always starts with at least two samples?
+                    Console.Error.WriteLine("Improper trailing bytes/samples!");
+                if (bitsPerSample != 4) // are MS ADPCM nibbles always 4-bit-sized?
+                    Console.Error.WriteLine("Nibble size is expected to be 4 bits!");
+                int leftoverNibbles = (leftoverSamples - 2) * channelCount;
+                int leftoverBytes = 7 * channelCount
+                    + (int)Math.Ceiling((leftoverNibbles * bitsPerSample) * 0.125);
+                Array.Resize(ref soundData, wholeBlocks * blockAlign + leftoverBytes);
             }
         }
 
@@ -105,6 +115,7 @@ namespace Oni.Sound
         public int AverageBytesPerSecond => averageBytesPerSecond;
         public int BlockAlign => blockAlign;
         public int BitsPerSample => bitsPerSample;
+        public int SampleCount => sampleCount;
         public byte[] ExtraData => extraData;
         public byte[] SoundData => soundData;
     }