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add alac source code - part one

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Ashley 2023-02-12 09:12:54 +00:00
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commit 9e2213a2af
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alac/codec/matrixlib.h Normal file
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/*
* 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: 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( int16_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, int16_t * out, uint32_t stride, int32_t numSamples, int32_t mixbits, int32_t mixres );
// 20-bit routines
void mix20( uint8_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, uint8_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( uint8_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, uint8_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( uint8_t * in, uint32_t stride, int32_t * out, int32_t numSamples );
void copy24ToPredictor( uint8_t * in, uint32_t stride, int32_t * out, int32_t numSamples );
void copyPredictorTo24( int32_t * in, uint8_t * out, uint32_t stride, int32_t numSamples );
void copyPredictorTo24Shift( int32_t * in, uint16_t * shift, uint8_t * out, uint32_t stride, int32_t numSamples, int32_t bytesShifted );
void copyPredictorTo20( int32_t * in, uint8_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 */