add alac source code - part 3 :^

alac/codec/ALACBitUtilities.h

@@ -0,0 +1,104 @@
+/*
+ * 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:		ALACBitUtilities.h
+	
+	$NoKeywords: $
+=============================================================================*/
+
+#ifndef __ALACBITUTILITIES_H
+#define __ALACBITUTILITIES_H
+
+#include <stdint.h>
+
+#ifndef MIN
+#define MIN(x, y) 			( (x)<(y) ?(x) :(y) )
+#endif //MIN
+#ifndef MAX
+#define MAX(x, y) 			( (x)>(y) ?(x): (y) )
+#endif //MAX
+
+#ifndef nil
+#define nil NULL
+#endif
+
+#define RequireAction(condition, action)			if (!(condition)) { action }
+#define RequireActionSilent(condition, action)			if (!(condition)) { action }
+#define RequireNoErr(condition, action)			if ((condition)) { action }
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+enum
+{
+    ALAC_noErr = 0
+};
+    
+
+typedef enum
+{
+    
+    ID_SCE = 0,						/* Single Channel Element   */
+    ID_CPE = 1,						/* Channel Pair Element     */
+    ID_CCE = 2,						/* Coupling Channel Element */
+    ID_LFE = 3,						/* LFE Channel Element      */
+    ID_DSE = 4,						/* not yet supported        */
+    ID_PCE = 5,
+    ID_FIL = 6,
+    ID_END = 7
+} ELEMENT_TYPE;
+
+// types
+typedef struct BitBuffer
+{
+	uint8_t *		cur;
+	uint8_t *		end;
+	uint32_t		bitIndex;
+	uint32_t		byteSize;
+	
+} BitBuffer;
+
+/*
+	BitBuffer routines
+	- these routines take a fixed size buffer and read/write to it
+	- bounds checking must be done by the client
+*/
+void	BitBufferInit( BitBuffer * bits, uint8_t * buffer, uint32_t byteSize );
+uint32_t	BitBufferRead( BitBuffer * bits, uint8_t numBits );   // note: cannot read more than 16 bits at a time
+uint8_t	BitBufferReadSmall( BitBuffer * bits, uint8_t numBits );
+uint8_t	BitBufferReadOne( BitBuffer * bits );
+uint32_t	BitBufferPeek( BitBuffer * bits, uint8_t numBits );   // note: cannot read more than 16 bits at a time
+uint32_t	BitBufferPeekOne( BitBuffer * bits );
+uint32_t	BitBufferUnpackBERSize( BitBuffer * bits );
+uint32_t	BitBufferGetPosition( BitBuffer * bits );
+void	BitBufferByteAlign( BitBuffer * bits, int32_t addZeros );
+void	BitBufferAdvance( BitBuffer * bits, uint32_t numBits );
+void	BitBufferRewind( BitBuffer * bits, uint32_t numBits );
+void	BitBufferWrite( BitBuffer * bits, uint32_t value, uint32_t numBits );
+void	BitBufferReset( BitBuffer * bits);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* __BITUTILITIES_H */