silently discard trailing partial sample byte

src/read.rs

@@ -599,15 +599,11 @@ impl<R> WavReader<R>
 
         let num_samples = data_len / spec_ex.bytes_per_sample as u32;
 
-        // It could be that num_samples * bytes_per_sample < data_len.
-        // If data_len is not a multiple of bytes_per_sample, there is some
-        // trailing data. Either somebody is playing some steganography game,
-        // but more likely something is very wrong, and we should refuse to
-        // decode the file, as it is invalid.
-        if num_samples * spec_ex.bytes_per_sample as u32 != data_len {
-            let msg = "data chunk length is not a multiple of sample size";
-            return Err(Error::FormatError(msg));
-        }
+        // If data_len is not a multiple of bytes_per_sample, the trailing
+        // partial sample byte(s) are silently discarded. The integer division
+        // above already truncates to the last complete sample frame.
+        // This tolerates WAV files where the last byte of a multi-byte sample
+        // was lost (e.g., truncated file transfers).
 
         // The number of samples must be a multiple of the number of channels,
         // otherwise the last inter-channel sample would not have data for all