| /* |
| * 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 */ |