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/*
* Copyright (c) 2011 Apple Inc. All rights reserved.
* Copyright (C) 2012-2014 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: matrixlib.h
Contains: ALAC mixing/matrixing routines to/from 32-bit predictor buffers.
Copyright: Copyright (C) 2004 to 2011 Apple, Inc.
*/
#ifndef __MATRIXLIB_H
#define __MATRIXLIB_H
#pragma once
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
// 16-bit routines
void mix16 (int32_t * in, uint32_t stride, int32_t * u, int32_t * v, int32_t numSamples, int32_t mixbits, int32_t mixres) ;
void unmix16 (int32_t * u, int32_t * v, int32_t * out, uint32_t stride, int32_t numSamples, int32_t mixbits, int32_t mixres) ;
// 20-bit routines
void mix20 (int32_t * in, uint32_t stride, int32_t * u, int32_t * v, int32_t numSamples, int32_t mixbits, int32_t mixres) ;
void unmix20 (int32_t * u, int32_t * v, int32_t * out, uint32_t stride, int32_t numSamples, int32_t mixbits, int32_t mixres) ;
// 24-bit routines
// - 24-bit data sometimes compresses better by shifting off the bottom byte so these routines deal with
// the specified "unused lower bytes" in the combined "shift" buffer
void mix24 (int32_t * in, uint32_t stride, int32_t * u, int32_t * v, int32_t numSamples,
int32_t mixbits, int32_t mixres, uint16_t * shiftUV, int32_t bytesShifted) ;
void unmix24 (int32_t * u, int32_t * v, int32_t * out, uint32_t stride, int32_t numSamples,
int32_t mixbits, int32_t mixres, uint16_t * shiftUV, int32_t bytesShifted) ;
// 32-bit routines
// - note that these really expect the internal data width to be < 32-bit but the arrays are 32-bit
// - otherwise, the calculations might overflow into the 33rd bit and be lost
// - therefore, these routines deal with the specified "unused lower" bytes in the combined "shift" buffer
void mix32 (int32_t * in, uint32_t stride, int32_t * u, int32_t * v, int32_t numSamples,
int32_t mixbits, int32_t mixres, uint16_t * shiftUV, int32_t bytesShifted) ;
void unmix32 (int32_t * u, int32_t * v, int32_t * out, uint32_t stride, int32_t numSamples,
int32_t mixbits, int32_t mixres, uint16_t * shiftUV, int32_t bytesShifted) ;
// 20/24/32-bit <-> 32-bit helper routines (not really matrixing but convenient to put here)
void copy20ToPredictor (int32_t * in, uint32_t stride, int32_t * out, int32_t numSamples) ;
void copy24ToPredictor (int32_t * in, uint32_t stride, int32_t * out, int32_t numSamples) ;
void copyPredictorTo24 (int32_t * in, int32_t * out, uint32_t stride, int32_t numSamples) ;
void copyPredictorTo24Shift (int32_t * in, uint16_t * shift, int32_t * out, uint32_t stride, int32_t numSamples, int32_t bytesShifted) ;
void copyPredictorTo20 (int32_t * in, int32_t * out, uint32_t stride, int32_t numSamples) ;
void copyPredictorTo32 (int32_t * in, int32_t * out, uint32_t stride, int32_t numSamples) ;
void copyPredictorTo32Shift (int32_t * in, uint16_t * shift, int32_t * out, uint32_t stride, int32_t numSamples, int32_t bytesShifted) ;
#ifdef __cplusplus
}
#endif
#endif /* __MATRIXLIB_H */
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