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