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93 lines
3 KiB
C
93 lines
3 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: ALACEncoder.h
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*/
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#pragma once
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#include <stdint.h>
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#include "ALACAudioTypes.h"
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struct BitBuffer;
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class ALACEncoder
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{
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public:
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ALACEncoder();
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virtual ~ALACEncoder();
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virtual int32_t Encode(AudioFormatDescription theInputFormat, AudioFormatDescription theOutputFormat,
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unsigned char * theReadBuffer, unsigned char * theWriteBuffer, int32_t * ioNumBytes);
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virtual int32_t Finish( );
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void SetFastMode( bool fast ) { mFastMode = fast; };
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// this must be called *before* InitializeEncoder()
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void SetFrameSize( uint32_t frameSize ) { mFrameSize = frameSize; };
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void GetConfig( ALACSpecificConfig & config );
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uint32_t GetMagicCookieSize(uint32_t inNumChannels);
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void GetMagicCookie( void * config, uint32_t * ioSize );
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virtual int32_t InitializeEncoder(AudioFormatDescription theOutputFormat);
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protected:
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virtual void GetSourceFormat( const AudioFormatDescription * source, AudioFormatDescription * output );
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int32_t EncodeStereo( struct BitBuffer * bitstream, void * input, uint32_t stride, uint32_t channelIndex, uint32_t numSamples );
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int32_t EncodeStereoFast( struct BitBuffer * bitstream, void * input, uint32_t stride, uint32_t channelIndex, uint32_t numSamples );
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int32_t EncodeStereoEscape( struct BitBuffer * bitstream, void * input, uint32_t stride, uint32_t numSamples );
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int32_t EncodeMono( struct BitBuffer * bitstream, void * input, uint32_t stride, uint32_t channelIndex, uint32_t numSamples );
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// ALAC encoder parameters
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int16_t mBitDepth;
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bool mFastMode;
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// encoding state
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int16_t mLastMixRes[kALACMaxChannels];
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// encoding buffers
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int32_t * mMixBufferU;
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int32_t * mMixBufferV;
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int32_t * mPredictorU;
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int32_t * mPredictorV;
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uint16_t * mShiftBufferUV;
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uint8_t * mWorkBuffer;
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// per-channel coefficients buffers
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int16_t mCoefsU[kALACMaxChannels][kALACMaxSearches][kALACMaxCoefs];
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int16_t mCoefsV[kALACMaxChannels][kALACMaxSearches][kALACMaxCoefs];
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// encoding statistics
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uint32_t mTotalBytesGenerated;
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uint32_t mAvgBitRate;
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uint32_t mMaxFrameBytes;
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uint32_t mFrameSize;
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uint32_t mMaxOutputBytes;
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uint32_t mNumChannels;
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uint32_t mOutputSampleRate;
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};
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