Fix to wave-reading code to read wav's with odd number of samples.

src/feat/wave-reader.cc

@@ -220,7 +220,10 @@ void WaveData::Read(std::istream &is) {
   uint32 data_chunk_size = ReadUint32(is, swap);
   riff_chunk_read += 4;
 
-  if (riff_chunk_read + data_chunk_size != riff_chunk_size) {
+  if (std::abs((riff_chunk_read + data_chunk_size) - riff_chunk_size) > 1) {
+    // we allow the size to be off by one, because there is a weirdness in the
+    // format of RIFF files that means that the input may sometimes be padded
+    // with 1 unused byte to make the total size even.
     KALDI_ERR << "Expected " << riff_chunk_size << " bytes in RIFF chunk, but "
               << "after first data block there will be " << riff_chunk_read
               << " + " << data_chunk_size << " bytes "