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81 lines
3.5 KiB
C
81 lines
3.5 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: matrixlib.h
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Contains: ALAC mixing/matrixing routines to/from 32-bit predictor buffers.
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Copyright: Copyright (C) 2004 to 2011 Apple, Inc.
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*/
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#ifndef __MATRIXLIB_H
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#define __MATRIXLIB_H
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#pragma once
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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// 16-bit routines
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void mix16( int16_t * in, uint32_t stride, int32_t * u, int32_t * v, int32_t numSamples, int32_t mixbits, int32_t mixres );
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void unmix16( int32_t * u, int32_t * v, int16_t * out, uint32_t stride, int32_t numSamples, int32_t mixbits, int32_t mixres );
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// 20-bit routines
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void mix20( uint8_t * in, uint32_t stride, int32_t * u, int32_t * v, int32_t numSamples, int32_t mixbits, int32_t mixres );
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void unmix20( int32_t * u, int32_t * v, uint8_t * out, uint32_t stride, int32_t numSamples, int32_t mixbits, int32_t mixres );
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// 24-bit routines
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// - 24-bit data sometimes compresses better by shifting off the bottom byte so these routines deal with
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// the specified "unused lower bytes" in the combined "shift" buffer
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void mix24( uint8_t * in, uint32_t stride, int32_t * u, int32_t * v, int32_t numSamples,
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int32_t mixbits, int32_t mixres, uint16_t * shiftUV, int32_t bytesShifted );
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void unmix24( int32_t * u, int32_t * v, uint8_t * out, uint32_t stride, int32_t numSamples,
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int32_t mixbits, int32_t mixres, uint16_t * shiftUV, int32_t bytesShifted );
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// 32-bit routines
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// - note that these really expect the internal data width to be < 32-bit but the arrays are 32-bit
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// - otherwise, the calculations might overflow into the 33rd bit and be lost
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// - therefore, these routines deal with the specified "unused lower" bytes in the combined "shift" buffer
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void mix32( int32_t * in, uint32_t stride, int32_t * u, int32_t * v, int32_t numSamples,
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int32_t mixbits, int32_t mixres, uint16_t * shiftUV, int32_t bytesShifted );
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void unmix32( int32_t * u, int32_t * v, int32_t * out, uint32_t stride, int32_t numSamples,
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int32_t mixbits, int32_t mixres, uint16_t * shiftUV, int32_t bytesShifted );
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// 20/24/32-bit <-> 32-bit helper routines (not really matrixing but convenient to put here)
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void copy20ToPredictor( uint8_t * in, uint32_t stride, int32_t * out, int32_t numSamples );
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void copy24ToPredictor( uint8_t * in, uint32_t stride, int32_t * out, int32_t numSamples );
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void copyPredictorTo24( int32_t * in, uint8_t * out, uint32_t stride, int32_t numSamples );
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void copyPredictorTo24Shift( int32_t * in, uint16_t * shift, uint8_t * out, uint32_t stride, int32_t numSamples, int32_t bytesShifted );
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void copyPredictorTo20( int32_t * in, uint8_t * out, uint32_t stride, int32_t numSamples );
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void copyPredictorTo32( int32_t * in, int32_t * out, uint32_t stride, int32_t numSamples );
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void copyPredictorTo32Shift( int32_t * in, uint16_t * shift, int32_t * out, uint32_t stride, int32_t numSamples, int32_t bytesShifted );
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#ifdef __cplusplus
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}
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#endif
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#endif /* __MATRIXLIB_H */
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