| /* |
| * 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 |
| |
| #ifdef _MSC_VER |
| #include <msstdint.h> |
| #else |
| #include <stdint.h> |
| #endif |
| |
| #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 */ |