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Support Maxis's XA format (Dwayne C. Litzenberger)

--- a/Changelog

+++ b/Changelog

@@ -26,6 +26,7 @@

   o Allow the rate and number of channels of .au files to be overridden

     by command-line arguments. (robs@users.sf.net)

   o More and better self-tests. (robs@users.sf.net)

+  o Support Maxis's XA format. (Dwayne C. Litzenberger)

 sox-12.18.2

 -----------

--- a/README

+++ b/README

@@ -41,6 +41,8 @@

     o GSM

     o RIFX (big endian)

   o Psion (palmtop) A-law WVE files and Record voice notes

+  o Maxis XA Audio files

+    o EA ADPCM (read support only, for now)

   o Pseudo-file formats that allow direct playing/recording

     from some audio devices under UNIX.

   o Pseudo-nul file that reads and writes from/to nowhere

--- a/sox.1

+++ b/sox.1

@@ -616,6 +616,13 @@

 .B .wve

 Psion 8-bit A-law. Used on older Psion PDAs.

 .TP 10

+.B .xa

+Maxis XA files

+.br

+These are 16-bit ADPCM sound files used by Maxis games.  Writing .xa files is

+currently not supported, although adding write support should not be very

+difficult.

+.TP 10

 .B .raw

 Raw files (no header).

 The sample rate, size (byte, word, etc), 

--- a/src/Makefile.in

+++ b/src/Makefile.in

@@ -45,7 +45,7 @@

 	  cvsd.o dat.o flac.o g711.o g721.o g723_16.o g723_24.o g723_40.o \

 	  g72x.o gsm.o hcom.o ima_rw.o maud.o mp3.o nulfile.o prc.o \

 	  raw.o sf.o smp.o sndrtool.o sphere.o tx16w.o voc.o vorbis.o \

-	  vox.o wav.o wve.o

+	  vox.o wav.o wve.o xa.o

 EOBJ	= avg.o band.o bandpass.o breject.o btrworth.o chorus.o compand.o \

 	  copy.o dcshift.o deemphas.o earwax.o echo.o echos.o \

--- a/src/auto.c

+++ b/src/auto.c

@@ -131,6 +131,12 @@

             {

                 type = "flac";

             }

+            else if ((memcmp(header, "XAI\0", 4) == 0) ||

+                     (memcmp(header, "XAJ\0", 4) == 0) ||

+                     (memcmp(header, "XA\0\0", 4) == 0))

+            {

+                type = "xa";

+            }

         } /* read 4-byte header */

         /* If we didn't find type yet then start looking for file

--- a/src/handlers.c

+++ b/src/handlers.c

@@ -69,6 +69,7 @@

   st_vox_format_fn,

   st_wav_format_fn,

   st_wve_format_fn,

+  st_xa_format_fn,

   NULL

 };

--- a/src/st_i.h

+++ b/src/st_i.h

@@ -202,6 +202,7 @@

 extern const st_format_t *st_vox_format_fn(void);

 extern const st_format_t *st_wav_format_fn(void);

 extern const st_format_t *st_wve_format_fn(void);

+extern const st_format_t *st_xa_format_fn(void);

 /* Raw I/O

  */