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Fix reading 64-bit float WAVs

Trying to read WAV files with 64-bit samples used to fail. Tell the WAV
handler that 8 bytes (64 bits) is an acceptable size for a sample.

Reported and analyzed by nu774 in issue 3481510.

--- a/ChangeLog

+++ b/ChangeLog

@@ -21,6 +21,7 @@

   o Fix crash when seeking within a FLAC file. [3476843] (Eric Wong)

   o Fix Ogg Vorbis files with certain numbers of channels being

     truncated. (Ulrich Klauer)

+  o Fix reading 64-bit float WAVs. [3481510] (nu774 and Ulrich Klauer)

 Audio device drivers:

--- a/src/wav.c

+++ b/src/wav.c

@@ -782,6 +782,11 @@

         ft->encoding.encoding = SOX_ENCODING_SIGN2;

       break;

+    case 8:

+      if (ft->encoding.encoding == SOX_ENCODING_UNKNOWN)

+        ft->encoding.encoding = SOX_ENCODING_FLOAT;

+      break;

+

     default:

       lsx_fail_errno(ft,SOX_EFMT,"Sorry, don't understand .wav size");

       return SOX_EOF;