1 /* 2 * Copyright (c) 2011 Apple Inc. All rights reserved. 3 * 4 * @APPLE_APACHE_LICENSE_HEADER_START@ 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License") ; 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 * 18 * @APPLE_APACHE_LICENSE_HEADER_END@ 19 */ 20 21 /*============================================================================= 22 File: ALACBitUtilities.h 23 24 $NoKeywords: $ 25 =============================================================================*/ 26 27 #ifndef __ALACBITUTILITIES_H 28 #define __ALACBITUTILITIES_H 29 30 #include <stdint.h> 31 32 #ifndef MIN 33 #define MIN(x, y) ((x) < (y) ? (x) : (y)) 34 #endif // MIN 35 #ifndef MAX 36 #define MAX(x, y) ((x) > (y) ? (x) : (y)) 37 #endif // MAX 38 39 #define RequireAction(condition, action) if (! (condition)) { action } 40 #define RequireActionSilent(condition, action) if (! (condition)) { action } 41 #define RequireNoErr(condition, action) if (condition) { action } 42 43 enum 44 { 45 ALAC_noErr = 0 46 } ; 47 48 49 typedef enum 50 { ID_SCE = 0, /* Single Channel Element */ 51 ID_CPE = 1, /* Channel Pair Element */ 52 ID_CCE = 2, /* Coupling Channel Element */ 53 ID_LFE = 3, /* LFE Channel Element */ 54 ID_DSE = 4, /* not yet supported */ 55 ID_PCE = 5, 56 ID_FIL = 6, 57 ID_END = 7 58 } ELEMENT_TYPE ; 59 60 // types 61 typedef struct BitBuffer 62 { 63 uint8_t * cur ; 64 uint8_t * end ; 65 uint32_t bitIndex ; 66 uint32_t byteSize ; 67 68 } BitBuffer ; 69 70 /* 71 BitBuffer routines 72 - these routines take a fixed size buffer and read/write to it 73 - bounds checking must be done by the client 74 */ 75 void BitBufferInit (BitBuffer * bits, uint8_t * buffer, uint32_t byteSize) ; 76 uint32_t BitBufferRead (BitBuffer * bits, uint8_t numBits) ; // note: cannot read more than 16 bits at a time 77 uint8_t BitBufferReadSmall (BitBuffer * bits, uint8_t numBits) ; 78 uint8_t BitBufferReadOne (BitBuffer * bits) ; 79 uint32_t BitBufferPeek (BitBuffer * bits, uint8_t numBits) ; // note: cannot read more than 16 bits at a time 80 uint32_t BitBufferPeekOne (BitBuffer * bits) ; 81 uint32_t BitBufferUnpackBERSize (BitBuffer * bits) ; 82 uint32_t BitBufferGetPosition (BitBuffer * bits) ; 83 void BitBufferByteAlign (BitBuffer * bits, int32_t addZeros) ; 84 void BitBufferAdvance (BitBuffer * bits, uint32_t numBits) ; 85 void BitBufferRewind (BitBuffer * bits, uint32_t numBits) ; 86 void BitBufferWrite (BitBuffer * bits, uint32_t value, uint32_t numBits) ; 87 void BitBufferReset (BitBuffer * bits) ; 88 89 #endif /* __BITUTILITIES_H */ 90