SF [ 1231053 ] audioop - alaw encoding/decoding added, code updated

 This patch adds a-LAW encoding to audioop and replaces the old
u-LAW encoding/decoding code with the current code from sox.

Possible issues: the code from sox uses int16_t.

Code by Lars Immisch

1 files changed, 21 insertions, 3 deletions

diff --git a/Lib/test/test_audioop.py b/Lib/test/test_audioop.py
index 440adab..f585733 100644
--- a/Lib/test/test_audioop.py
+++ b/Lib/test/test_audioop.py
@@ -136,12 +136,30 @@ def testlin2adpcm(data):
         return 0
     return 1
 
+def testlin2alaw(data):
+    if verbose:
+        print 'lin2alaw'
+    if audioop.lin2alaw(data[0], 1) != '\xd5\xc5\xf5' or \
+              audioop.lin2alaw(data[1], 2) != '\xd5\xd5\xd5' or \
+              audioop.lin2alaw(data[2], 4) != '\xd5\xd5\xd5':
+        return 0
+    return 1
+
+def testalaw2lin(data):
+    if verbose:
+        print 'alaw2lin'
+    # Cursory
+    d = audioop.lin2alaw(data[0], 1)
+    if audioop.alaw2lin(d, 1) != data[0]:
+        return 0
+    return 1
+
 def testlin2ulaw(data):
     if verbose:
         print 'lin2ulaw'
-    if audioop.lin2ulaw(data[0], 1) != '\377\347\333' or \
-              audioop.lin2ulaw(data[1], 2) != '\377\377\377' or \
-              audioop.lin2ulaw(data[2], 4) != '\377\377\377':
+    if audioop.lin2ulaw(data[0], 1) != '\xff\xe7\xdb' or \
+              audioop.lin2ulaw(data[1], 2) != '\xff\xff\xff' or \
+              audioop.lin2ulaw(data[2], 4) != '\xff\xff\xff':
         return 0
     return 1