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105 lines
2.9 KiB
C
105 lines
2.9 KiB
C
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/*
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* Copyright (c) 2011 Apple Inc. All rights reserved.
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*
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* @APPLE_APACHE_LICENSE_HEADER_START@
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* @APPLE_APACHE_LICENSE_HEADER_END@
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*/
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/*=============================================================================
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File: ALACBitUtilities.h
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$NoKeywords: $
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=============================================================================*/
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#ifndef __ALACBITUTILITIES_H
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#define __ALACBITUTILITIES_H
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#include <stdint.h>
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#ifndef MIN
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#define MIN(x, y) ( (x)<(y) ?(x) :(y) )
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#endif //MIN
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#ifndef MAX
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#define MAX(x, y) ( (x)>(y) ?(x): (y) )
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#endif //MAX
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#ifndef nil
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#define nil NULL
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#endif
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#define RequireAction(condition, action) if (!(condition)) { action }
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#define RequireActionSilent(condition, action) if (!(condition)) { action }
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#define RequireNoErr(condition, action) if ((condition)) { action }
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#ifdef __cplusplus
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extern "C" {
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#endif
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enum
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{
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ALAC_noErr = 0
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};
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typedef enum
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{
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ID_SCE = 0, /* Single Channel Element */
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ID_CPE = 1, /* Channel Pair Element */
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ID_CCE = 2, /* Coupling Channel Element */
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ID_LFE = 3, /* LFE Channel Element */
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ID_DSE = 4, /* not yet supported */
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ID_PCE = 5,
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ID_FIL = 6,
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ID_END = 7
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} ELEMENT_TYPE;
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// types
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typedef struct BitBuffer
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{
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uint8_t * cur;
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uint8_t * end;
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uint32_t bitIndex;
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uint32_t byteSize;
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} BitBuffer;
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/*
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BitBuffer routines
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- these routines take a fixed size buffer and read/write to it
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- bounds checking must be done by the client
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*/
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void BitBufferInit( BitBuffer * bits, uint8_t * buffer, uint32_t byteSize );
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uint32_t BitBufferRead( BitBuffer * bits, uint8_t numBits ); // note: cannot read more than 16 bits at a time
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uint8_t BitBufferReadSmall( BitBuffer * bits, uint8_t numBits );
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uint8_t BitBufferReadOne( BitBuffer * bits );
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uint32_t BitBufferPeek( BitBuffer * bits, uint8_t numBits ); // note: cannot read more than 16 bits at a time
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uint32_t BitBufferPeekOne( BitBuffer * bits );
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uint32_t BitBufferUnpackBERSize( BitBuffer * bits );
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uint32_t BitBufferGetPosition( BitBuffer * bits );
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void BitBufferByteAlign( BitBuffer * bits, int32_t addZeros );
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void BitBufferAdvance( BitBuffer * bits, uint32_t numBits );
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void BitBufferRewind( BitBuffer * bits, uint32_t numBits );
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void BitBufferWrite( BitBuffer * bits, uint32_t value, uint32_t numBits );
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void BitBufferReset( BitBuffer * bits);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __BITUTILITIES_H */
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