Changeset 1156 for OniSplit/Sound/WavFile.cs

Timestamp:

May 8, 2021, 3:44:24 AM (4 years ago)

Author:

geyser

Message:

Fixed importing of "fact" chunk, as well as an unhandled fatal when attempting to transcode IMA4 to MS ADPCM. Also added missing padding to SNDD template and fixed the duration calculation for WAV-to-SNDD.

File:

• OniSplit/Sound/WavFile.cs (modified) (4 diffs)

OniSplit/Sound/WavFile.cs

@@ -40 +40 @@
                 var header = new WavFile()
                 {
-                    sampleCount = 0
+                    sampleCount = -1
                 };
 
@@ -56 +56 @@
                         header.ReadDataChunk(reader, chunkSize);
                 }
-
-                header.ValidateSampleCount();
+                header.TruncatePerFact();
                 return header;
             }
@@ -86 +85 @@
             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);
             }
         }
@@ -106 +116 @@
         public int BlockAlign => blockAlign;
         public int BitsPerSample => bitsPerSample;
+        public int SampleCount => sampleCount;
         public byte[] ExtraData => extraData;
         public byte[] SoundData => soundData;