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/*
* 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 */
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