add alac source code - part two :^

alac/codec/dplib.h

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2011 Apple Inc. All rights reserved.
+ *
+ * @APPLE_APACHE_LICENSE_HEADER_START@
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * @APPLE_APACHE_LICENSE_HEADER_END@
+ */
+
+/*
+	File:		dplib.h
+	
+	Contains:	Dynamic Predictor routines
+
+	Copyright:	Copyright (C) 2001-2011 Apple, Inc.
+*/
+
+#ifndef __DPLIB_H__
+#define __DPLIB_H__
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// defines
+
+#define DENSHIFT_MAX  15
+#define DENSHIFT_DEFAULT 9
+#define AINIT 38
+#define BINIT (-29)
+#define CINIT (-2)
+#define NUMCOEPAIRS 16
+
+// prototypes
+
+void init_coefs( int16_t * coefs, uint32_t denshift, int32_t numPairs );
+void copy_coefs( int16_t * srcCoefs, int16_t * dstCoefs, int32_t numPairs );
+
+// NOTE: these routines read at least "numactive" samples so the i/o buffers must be at least that big
+
+void pc_block( int32_t * in, int32_t * pc, int32_t num, int16_t * coefs, int32_t numactive, uint32_t chanbits, uint32_t denshift );
+void unpc_block( int32_t * pc, int32_t * out, int32_t num, int16_t * coefs, int32_t numactive, uint32_t chanbits, uint32_t denshift );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* __DPLIB_H__ */