Fix chan_modem_i4l (bug #3410)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@4885 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_modem_i4l.c

@@ -420,7 +420,7 @@ static struct ast_frame *i4l_read(struct ast_modem_pvt *p)
 						if (!f)
 							return NULL;
 					} else {
-						*(b++) = AST_A2LIN(result[x]);
+						*(b++) = AST_ALAW(result[x]);
 						p->obuflen += 2;
 					}
 				}
@@ -480,7 +480,7 @@ static int i4l_write(struct ast_modem_pvt *p, struct ast_frame *f)
 		return -1;
 	}
 	for (x=0;x<f->datalen/2;x++) {
-		b = AST_ALAW(((short *)f->data)[x]);
+		b = AST_LIN2A(((short *)f->data)[x]);
 		result[bpos++] = b;
 		if (b == CHAR_DLE)
 			result[bpos++]=b;

include/asterisk/alaw.h

@@ -29,6 +29,6 @@ extern unsigned char __ast_lin2a[8192];
 extern short __ast_alaw[256];
 
 #define AST_LIN2A(a) (__ast_lin2a[((unsigned short)(a)) >> 3])
-#define AST_ALAW(a) (__ast_alaw[(a)])
+#define AST_ALAW(a) (__ast_alaw[(int)(a)])
 
 #endif