src/lib/alac/codec/.svn/text-base/ALACDecoder.h.svn-base

   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 */