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: ALACDecoder.h 23 */ 24 25 #ifndef _ALACDECODER_H 26 #define _ALACDECODER_H 27 28 #if PRAGMA_ONCE 29 #pragma once 30 #endif 31 32 #include <stdint.h> 33 34 #include "ALACAudioTypes.h" 35 36 struct BitBuffer; 37 38 class ALACDecoder 39 { 40 public: 41 ALACDecoder(); 42 ~ALACDecoder(); 43 44 int32_t Init( void * inMagicCookie, uint32_t inMagicCookieSize ); 45 int32_t Decode( struct BitBuffer * bits, uint8_t * sampleBuffer, uint32_t numSamples, uint32_t numChannels, uint32_t * outNumSamples ); 46 47 public: 48 // decoding parameters (public for use in the analyzer) 49 ALACSpecificConfig mConfig; 50 51 protected: 52 int32_t FillElement( struct BitBuffer * bits ); 53 int32_t DataStreamElement( struct BitBuffer * bits ); 54 55 uint16_t mActiveElements; 56 57 // decoding buffers 58 int32_t * mMixBufferU; 59 int32_t * mMixBufferV; 60 int32_t * mPredictor; 61 uint16_t * mShiftBuffer; // note: this points to mPredictor's memory but different 62 // variable for clarity and type difference 63 }; 64 65 #endif /* _ALACDECODER_H */ 66