1/* 2 * Copyright (c) 2011 Apple Inc. All rights reserved. 3 * Copyright (C) 2012-2014 Erik de Castro Lopo <erikd@mega-nerd.com> 4 * 5 * @APPLE_APACHE_LICENSE_HEADER_START@ 6 * 7 * Licensed under the Apache License, Version 2.0 (the "License") ; 8 * you may not use this file except in compliance with the License. 9 * You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, software 14 * distributed under the License is distributed on an "AS IS" BASIS, 15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 16 * See the License for the specific language governing permissions and 17 * limitations under the License. 18 * 19 * @APPLE_APACHE_LICENSE_HEADER_END@ 20 */ 21 22/* 23 File: matrixlib.h 24 25 Contains: ALAC mixing/matrixing routines to/from 32-bit predictor buffers. 26 27 Copyright: Copyright (C) 2004 to 2011 Apple, Inc. 28*/ 29 30#ifndef __MATRIXLIB_H 31#define __MATRIXLIB_H 32 33#pragma once 34 35#include <stdint.h> 36 37#ifdef __cplusplus 38extern "C" { 39#endif 40 41// 16-bit routines 42void mix16 (const int32_t * in, uint32_t stride, int32_t * u, int32_t * v, int32_t numSamples, int32_t mixbits, int32_t mixres) ; 43void unmix16 (const int32_t * u, int32_t * v, int32_t * out, uint32_t stride, int32_t numSamples, int32_t mixbits, int32_t mixres) ; 44 45// 20-bit routines 46void mix20 (const int32_t * in, uint32_t stride, int32_t * u, int32_t * v, int32_t numSamples, int32_t mixbits, int32_t mixres) ; 47void unmix20 (const int32_t * u, int32_t * v, int32_t * out, uint32_t stride, int32_t numSamples, int32_t mixbits, int32_t mixres) ; 48 49// 24-bit routines 50// - 24-bit data sometimes compresses better by shifting off the bottom byte so these routines deal with 51// the specified "unused lower bytes" in the combined "shift" buffer 52void mix24 (const int32_t * in, uint32_t stride, int32_t * u, int32_t * v, int32_t numSamples, 53 int32_t mixbits, int32_t mixres, uint16_t * shiftUV, int32_t bytesShifted) ; 54void unmix24 (const int32_t * u, int32_t * v, int32_t * out, uint32_t stride, int32_t numSamples, 55 int32_t mixbits, int32_t mixres, uint16_t * shiftUV, int32_t bytesShifted) ; 56 57// 32-bit routines 58// - note that these really expect the internal data width to be < 32-bit but the arrays are 32-bit 59// - otherwise, the calculations might overflow into the 33rd bit and be lost 60// - therefore, these routines deal with the specified "unused lower" bytes in the combined "shift" buffer 61void mix32 (const int32_t * in, uint32_t stride, int32_t * u, int32_t * v, int32_t numSamples, 62 int32_t mixbits, int32_t mixres, uint16_t * shiftUV, int32_t bytesShifted) ; 63void unmix32 (const int32_t * u, int32_t * v, int32_t * out, uint32_t stride, int32_t numSamples, 64 int32_t mixbits, int32_t mixres, uint16_t * shiftUV, int32_t bytesShifted) ; 65 66// 20/24/32-bit <-> 32-bit helper routines (not really matrixing but convenient to put here) 67void copy20ToPredictor (const int32_t * in, uint32_t stride, int32_t * out, int32_t numSamples) ; 68void copy24ToPredictor (const int32_t * in, uint32_t stride, int32_t * out, int32_t numSamples) ; 69 70void copyPredictorTo24 (const int32_t * in, int32_t * out, uint32_t stride, int32_t numSamples) ; 71void copyPredictorTo24Shift (const int32_t * in, uint16_t * shift, int32_t * out, uint32_t stride, int32_t numSamples, int32_t bytesShifted) ; 72void copyPredictorTo20 (const int32_t * in, int32_t * out, uint32_t stride, int32_t numSamples) ; 73 74void copyPredictorTo32 (const int32_t * in, int32_t * out, uint32_t stride, int32_t numSamples) ; 75void copyPredictorTo32Shift (const int32_t * in, uint16_t * shift, int32_t * out, uint32_t stride, int32_t numSamples, int32_t bytesShifted) ; 76 77#ifdef __cplusplus 78} 79#endif 80 81#endif /* __MATRIXLIB_H */ 82