mirror of
https://github.com/signalwire/freeswitch.git
synced 2025-06-26 04:00:52 +00:00
104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2011 Apple Inc. All rights reserved.
|
||
|
|
* Copyright (C) 2012-2013 Erik de Castro Lopo <erikd@mega-nerd.com>
|
||
|
|
*
|
||
|
|
* @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: alac_codec.h
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef ALAC_CODEC_H
|
||
|
|
#define ALAC_CODEC_H
|
||
|
|
|
||
|
|
#include <stdint.h>
|
||
|
|
|
||
|
|
#include "ALACAudioTypes.h"
|
||
|
|
|
||
|
|
#define ALAC_FRAME_LENGTH 4096
|
||
|
|
|
||
|
|
struct BitBuffer;
|
||
|
|
|
||
|
|
typedef struct alac_decoder_s
|
||
|
|
{
|
||
|
|
// decoding parameters (public for use in the analyzer)
|
||
|
|
ALACSpecificConfig mConfig;
|
||
|
|
|
||
|
|
uint16_t mActiveElements;
|
||
|
|
|
||
|
|
// decoding buffers
|
||
|
|
int32_t mMixBufferU [ALAC_FRAME_LENGTH];
|
||
|
|
int32_t mMixBufferV [ALAC_FRAME_LENGTH];
|
||
|
|
union
|
||
|
|
{
|
||
|
|
int32_t mPredictor [ALAC_FRAME_LENGTH];
|
||
|
|
uint16_t mShiftBuffer [ALAC_FRAME_LENGTH];
|
||
|
|
} ;
|
||
|
|
} ALAC_DECODER ;
|
||
|
|
|
||
|
|
typedef struct alac_encoder_s
|
||
|
|
{
|
||
|
|
// ALAC encoder parameters
|
||
|
|
int16_t mBitDepth;
|
||
|
|
|
||
|
|
// encoding state
|
||
|
|
int16_t mLastMixRes [kALACMaxChannels];
|
||
|
|
|
||
|
|
int32_t mFastMode;
|
||
|
|
|
||
|
|
// encoding buffers
|
||
|
|
int32_t mMixBufferU [ALAC_FRAME_LENGTH] ;
|
||
|
|
int32_t mMixBufferV [ALAC_FRAME_LENGTH] ;
|
||
|
|
int32_t mPredictorU [ALAC_FRAME_LENGTH] ;
|
||
|
|
int32_t mPredictorV [ALAC_FRAME_LENGTH] ;
|
||
|
|
uint16_t mShiftBufferUV [2 * ALAC_FRAME_LENGTH] ;
|
||
|
|
uint8_t mWorkBuffer [4 * ALAC_FRAME_LENGTH];
|
||
|
|
|
||
|
|
// 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;
|
||
|
|
} ALAC_ENCODER ;
|
||
|
|
|
||
|
|
|
||
|
|
int32_t alac_decoder_init (ALAC_DECODER *p, void * inMagicCookie, uint32_t inMagicCookieSize) ;
|
||
|
|
int32_t alac_encoder_init (ALAC_ENCODER *p, uint32_t samplerate, uint32_t channels, uint32_t format_flags, uint32_t frameSize) ;
|
||
|
|
|
||
|
|
int32_t alac_decode (ALAC_DECODER *, struct BitBuffer * bits, int32_t * sampleBuffer,
|
||
|
|
uint32_t numSamples, uint32_t numChannels, uint32_t * outNumSamples) ;
|
||
|
|
|
||
|
|
int32_t alac_encode (ALAC_ENCODER *p, uint32_t numChannels, uint32_t numSamples,
|
||
|
|
int32_t * theReadBuffer, unsigned char * theWriteBuffer,
|
||
|
|
uint32_t * ioNumBytes) ;
|
||
|
|
|
||
|
|
void alac_set_fastmode(ALAC_ENCODER * p, int32_t fast) ;
|
||
|
|
|
||
|
|
uint32_t alac_get_magic_cookie_size(uint32_t inNumChannels) ;
|
||
|
|
void alac_get_magic_cookie(ALAC_ENCODER *p, void * config, uint32_t * ioSize) ;
|
||
|
|
void alac_get_source_format(ALAC_ENCODER *p, const AudioFormatDescription * source, AudioFormatDescription * output) ;
|
||
|
|
|
||
|
|
#endif
|