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add alac source code - part one
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4 changed files with 892 additions and 0 deletions
80
alac/codec/makefile
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80
alac/codec/makefile
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# libalac make
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CFLAGS = -g -O3 -c
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LFLAGS = -Wall
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CC = g++
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SRCDIR = .
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OBJDIR = ./obj
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INCLUDES = .
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HEADERS = \
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$(SRCDIR)/EndianPortable.h \
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$(SRCDIR)/aglib.h \
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$(SRCDIR)/ALACAudioTypes.h \
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$(SRCDIR)/ALACBitUtilities.h\
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$(SRCDIR)/ALACDecoder.h \
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$(SRCDIR)/ALACEncoder.h \
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$(SRCDIR)/dplib.h \
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$(SRCDIR)/matrixlib.h
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SOURCES = \
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$(SRCDIR)/EndianPortable.c \
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$(SRCDIR)/ALACBitUtilities.c \
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$(SRCDIR)/ALACDecoder.cpp \
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$(SRCDIR)/ALACEncoder.cpp \
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$(SRCDIR)/ag_dec.c \
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$(SRCDIR)/ag_enc.c \
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$(SRCDIR)/dp_dec.c \
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$(SRCDIR)/dp_enc.c \
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$(SRCDIR)/matrix_dec.c \
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$(SRCDIR)/matrix_enc.c
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OBJS = \
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EndianPortable.o \
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ALACBitUtilities.o \
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ALACDecoder.o \
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ALACEncoder.o \
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ag_dec.o \
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ag_enc.o \
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dp_dec.o \
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dp_enc.o \
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matrix_dec.o \
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matrix_enc.o
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libalac.a: $(OBJS)
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ar rcs libalac.a $(OBJS)
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EndianPortable.o : EndianPortable.c
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$(CC) -I $(INCLUDES) $(CFLAGS) EndianPortable.c
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ALACBitUtilities.o : ALACBitUtilities.c
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$(CC) -I $(INCLUDES) $(CFLAGS) ALACBitUtilities.c
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ALACDecoder.o : ALACDecoder.cpp
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$(CC) -I $(INCLUDES) $(CFLAGS) ALACDecoder.cpp
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ALACEncoder.o : ALACEncoder.cpp
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$(CC) -I $(INCLUDES) $(CFLAGS) ALACEncoder.cpp
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ag_dec.o : ag_dec.c
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$(CC) -I $(INCLUDES) $(CFLAGS) ag_dec.c
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ag_enc.o : ag_enc.c
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$(CC) -I $(INCLUDES) $(CFLAGS) ag_enc.c
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dp_dec.o : dp_dec.c
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$(CC) -I $(INCLUDES) $(CFLAGS) dp_dec.c
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dp_enc.o : dp_enc.c
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$(CC) -I $(INCLUDES) $(CFLAGS) dp_enc.c
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matrix_dec.o : matrix_dec.c
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$(CC) -I $(INCLUDES) $(CFLAGS) matrix_dec.c
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matrix_enc.o : matrix_enc.c
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$(CC) -I $(INCLUDES) $(CFLAGS) matrix_enc.c
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clean:
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-rm $(OBJS) libalac.a
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390
alac/codec/matrix_dec.c
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390
alac/codec/matrix_dec.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: matrix_dec.c
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Contains: ALAC mixing/matrixing decode routines.
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Copyright: (c) 2004-2011 Apple, Inc.
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*/
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#include "matrixlib.h"
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#include "ALACAudioTypes.h"
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// up to 24-bit "offset" macros for the individual bytes of a 20/24-bit word
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#if TARGET_RT_BIG_ENDIAN
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#define LBYTE 2
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#define MBYTE 1
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#define HBYTE 0
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#else
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#define LBYTE 0
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#define MBYTE 1
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#define HBYTE 2
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#endif
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/*
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There is no plain middle-side option; instead there are various mixing
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modes including middle-side, each lossless, as embodied in the mix()
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and unmix() functions. These functions exploit a generalized middle-side
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transformation:
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u := [(rL + (m-r)R)/m];
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v := L - R;
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where [ ] denotes integer floor. The (lossless) inverse is
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L = u + v - [rV/m];
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R = L - v;
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*/
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// 16-bit routines
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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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{
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int16_t * op = out;
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int32_t j;
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if ( mixres != 0 )
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{
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/* matrixed stereo */
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for ( j = 0; j < numSamples; j++ )
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{
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int32_t l, r;
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l = u[j] + v[j] - ((mixres * v[j]) >> mixbits);
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r = l - v[j];
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op[0] = (int16_t) l;
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op[1] = (int16_t) r;
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op += stride;
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}
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}
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else
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{
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/* Conventional separated stereo. */
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for ( j = 0; j < numSamples; j++ )
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{
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op[0] = (int16_t) u[j];
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op[1] = (int16_t) v[j];
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op += stride;
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}
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}
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}
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// 20-bit routines
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// - the 20 bits of data are left-justified in 3 bytes of storage but right-aligned for input/output predictor buffers
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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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{
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uint8_t * op = out;
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int32_t j;
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if ( mixres != 0 )
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{
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/* matrixed stereo */
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for ( j = 0; j < numSamples; j++ )
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{
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int32_t l, r;
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l = u[j] + v[j] - ((mixres * v[j]) >> mixbits);
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r = l - v[j];
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l <<= 4;
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r <<= 4;
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op[HBYTE] = (uint8_t)((l >> 16) & 0xffu);
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op[MBYTE] = (uint8_t)((l >> 8) & 0xffu);
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op[LBYTE] = (uint8_t)((l >> 0) & 0xffu);
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op += 3;
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op[HBYTE] = (uint8_t)((r >> 16) & 0xffu);
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op[MBYTE] = (uint8_t)((r >> 8) & 0xffu);
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op[LBYTE] = (uint8_t)((r >> 0) & 0xffu);
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op += (stride - 1) * 3;
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}
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}
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else
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{
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/* Conventional separated stereo. */
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for ( j = 0; j < numSamples; j++ )
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{
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int32_t val;
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val = u[j] << 4;
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op[HBYTE] = (uint8_t)((val >> 16) & 0xffu);
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op[MBYTE] = (uint8_t)((val >> 8) & 0xffu);
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op[LBYTE] = (uint8_t)((val >> 0) & 0xffu);
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op += 3;
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val = v[j] << 4;
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op[HBYTE] = (uint8_t)((val >> 16) & 0xffu);
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op[MBYTE] = (uint8_t)((val >> 8) & 0xffu);
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op[LBYTE] = (uint8_t)((val >> 0) & 0xffu);
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op += (stride - 1) * 3;
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}
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}
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}
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// 24-bit routines
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// - the 24 bits of data are right-justified in the input/output predictor buffers
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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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{
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uint8_t * op = out;
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int32_t shift = bytesShifted * 8;
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int32_t l, r;
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int32_t j, k;
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if ( mixres != 0 )
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{
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/* matrixed stereo */
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if ( bytesShifted != 0 )
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{
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for ( j = 0, k = 0; j < numSamples; j++, k += 2 )
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{
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l = u[j] + v[j] - ((mixres * v[j]) >> mixbits);
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r = l - v[j];
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l = (l << shift) | (uint32_t) shiftUV[k + 0];
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r = (r << shift) | (uint32_t) shiftUV[k + 1];
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op[HBYTE] = (uint8_t)((l >> 16) & 0xffu);
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op[MBYTE] = (uint8_t)((l >> 8) & 0xffu);
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op[LBYTE] = (uint8_t)((l >> 0) & 0xffu);
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op += 3;
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op[HBYTE] = (uint8_t)((r >> 16) & 0xffu);
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op[MBYTE] = (uint8_t)((r >> 8) & 0xffu);
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op[LBYTE] = (uint8_t)((r >> 0) & 0xffu);
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op += (stride - 1) * 3;
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}
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}
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else
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{
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for ( j = 0; j < numSamples; j++ )
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{
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l = u[j] + v[j] - ((mixres * v[j]) >> mixbits);
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r = l - v[j];
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op[HBYTE] = (uint8_t)((l >> 16) & 0xffu);
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op[MBYTE] = (uint8_t)((l >> 8) & 0xffu);
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op[LBYTE] = (uint8_t)((l >> 0) & 0xffu);
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op += 3;
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op[HBYTE] = (uint8_t)((r >> 16) & 0xffu);
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op[MBYTE] = (uint8_t)((r >> 8) & 0xffu);
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op[LBYTE] = (uint8_t)((r >> 0) & 0xffu);
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op += (stride - 1) * 3;
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}
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}
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}
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else
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{
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/* Conventional separated stereo. */
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if ( bytesShifted != 0 )
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{
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for ( j = 0, k = 0; j < numSamples; j++, k += 2 )
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{
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l = u[j];
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r = v[j];
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l = (l << shift) | (uint32_t) shiftUV[k + 0];
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r = (r << shift) | (uint32_t) shiftUV[k + 1];
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op[HBYTE] = (uint8_t)((l >> 16) & 0xffu);
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op[MBYTE] = (uint8_t)((l >> 8) & 0xffu);
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op[LBYTE] = (uint8_t)((l >> 0) & 0xffu);
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op += 3;
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op[HBYTE] = (uint8_t)((r >> 16) & 0xffu);
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op[MBYTE] = (uint8_t)((r >> 8) & 0xffu);
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op[LBYTE] = (uint8_t)((r >> 0) & 0xffu);
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op += (stride - 1) * 3;
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}
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}
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else
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{
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for ( j = 0; j < numSamples; j++ )
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{
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int32_t val;
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val = u[j];
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op[HBYTE] = (uint8_t)((val >> 16) & 0xffu);
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op[MBYTE] = (uint8_t)((val >> 8) & 0xffu);
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op[LBYTE] = (uint8_t)((val >> 0) & 0xffu);
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op += 3;
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val = v[j];
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op[HBYTE] = (uint8_t)((val >> 16) & 0xffu);
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op[MBYTE] = (uint8_t)((val >> 8) & 0xffu);
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op[LBYTE] = (uint8_t)((val >> 0) & 0xffu);
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op += (stride - 1) * 3;
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}
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}
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}
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}
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// 32-bit routines
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// - note that these really expect the internal data width to be < 32 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 "shift" buffers
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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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{
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int32_t * op = out;
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int32_t shift = bytesShifted * 8;
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int32_t l, r;
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int32_t j, k;
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if ( mixres != 0 )
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{
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//Assert( bytesShifted != 0 );
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/* matrixed stereo with shift */
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for ( j = 0, k = 0; j < numSamples; j++, k += 2 )
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{
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int32_t lt, rt;
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lt = u[j];
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rt = v[j];
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l = lt + rt - ((mixres * rt) >> mixbits);
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r = l - rt;
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op[0] = (l << shift) | (uint32_t) shiftUV[k + 0];
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op[1] = (r << shift) | (uint32_t) shiftUV[k + 1];
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op += stride;
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}
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}
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else
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{
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if ( bytesShifted == 0 )
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{
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/* interleaving w/o shift */
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for ( j = 0; j < numSamples; j++ )
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{
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op[0] = u[j];
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op[1] = v[j];
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op += stride;
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}
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}
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else
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{
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/* interleaving with shift */
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for ( j = 0, k = 0; j < numSamples; j++, k += 2 )
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{
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op[0] = (u[j] << shift) | (uint32_t) shiftUV[k + 0];
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op[1] = (v[j] << shift) | (uint32_t) shiftUV[k + 1];
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op += stride;
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}
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}
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}
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}
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// 20/24-bit <-> 32-bit helper routines (not really matrixing but convenient to put here)
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void copyPredictorTo24( int32_t * in, uint8_t * out, uint32_t stride, int32_t numSamples )
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{
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uint8_t * op = out;
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int32_t j;
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for ( j = 0; j < numSamples; j++ )
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{
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int32_t val = in[j];
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op[HBYTE] = (uint8_t)((val >> 16) & 0xffu);
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op[MBYTE] = (uint8_t)((val >> 8) & 0xffu);
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op[LBYTE] = (uint8_t)((val >> 0) & 0xffu);
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op += (stride * 3);
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}
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}
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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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{
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uint8_t * op = out;
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int32_t shiftVal = bytesShifted * 8;
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int32_t j;
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//Assert( bytesShifted != 0 );
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for ( j = 0; j < numSamples; j++ )
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{
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int32_t val = in[j];
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val = (val << shiftVal) | (uint32_t) shift[j];
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op[HBYTE] = (uint8_t)((val >> 16) & 0xffu);
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op[MBYTE] = (uint8_t)((val >> 8) & 0xffu);
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op[LBYTE] = (uint8_t)((val >> 0) & 0xffu);
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op += (stride * 3);
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}
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}
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void copyPredictorTo20( int32_t * in, uint8_t * out, uint32_t stride, int32_t numSamples )
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{
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uint8_t * op = out;
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int32_t j;
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// 32-bit predictor values are right-aligned but 20-bit output values should be left-aligned
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// in the 24-bit output buffer
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for ( j = 0; j < numSamples; j++ )
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{
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int32_t val = in[j];
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op[HBYTE] = (uint8_t)((val >> 12) & 0xffu);
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op[MBYTE] = (uint8_t)((val >> 4) & 0xffu);
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op[LBYTE] = (uint8_t)((val << 4) & 0xffu);
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op += (stride * 3);
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}
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}
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void copyPredictorTo32( int32_t * in, int32_t * out, uint32_t stride, int32_t numSamples )
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{
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int32_t i, j;
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// this is only a subroutine to abstract the "iPod can only output 16-bit data" problem
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for ( i = 0, j = 0; i < numSamples; i++, j += stride )
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out[j] = in[i];
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}
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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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{
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int32_t * op = out;
|
||||
uint32_t shiftVal = bytesShifted * 8;
|
||||
int32_t j;
|
||||
|
||||
//Assert( bytesShifted != 0 );
|
||||
|
||||
// this is only a subroutine to abstract the "iPod can only output 16-bit data" problem
|
||||
for ( j = 0; j < numSamples; j++ )
|
||||
{
|
||||
op[0] = (in[j] << shiftVal) | (uint32_t) shift[j];
|
||||
op += stride;
|
||||
}
|
||||
}
|
||||
342
alac/codec/matrix_enc.c
Normal file
342
alac/codec/matrix_enc.c
Normal file
|
|
@ -0,0 +1,342 @@
|
|||
/*
|
||||
* 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: matrix_enc.c
|
||||
|
||||
Contains: ALAC mixing/matrixing encode routines.
|
||||
|
||||
Copyright: (c) 2004-2011 Apple, Inc.
|
||||
*/
|
||||
|
||||
#include "matrixlib.h"
|
||||
#include "ALACAudioTypes.h"
|
||||
|
||||
// up to 24-bit "offset" macros for the individual bytes of a 20/24-bit word
|
||||
#if TARGET_RT_BIG_ENDIAN
|
||||
#define LBYTE 2
|
||||
#define MBYTE 1
|
||||
#define HBYTE 0
|
||||
#else
|
||||
#define LBYTE 0
|
||||
#define MBYTE 1
|
||||
#define HBYTE 2
|
||||
#endif
|
||||
|
||||
/*
|
||||
There is no plain middle-side option; instead there are various mixing
|
||||
modes including middle-side, each lossless, as embodied in the mix()
|
||||
and unmix() functions. These functions exploit a generalized middle-side
|
||||
transformation:
|
||||
|
||||
u := [(rL + (m-r)R)/m];
|
||||
v := L - R;
|
||||
|
||||
where [ ] denotes integer floor. The (lossless) inverse is
|
||||
|
||||
L = u + v - [rV/m];
|
||||
R = L - v;
|
||||
*/
|
||||
|
||||
// 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 )
|
||||
{
|
||||
int16_t * ip = in;
|
||||
int32_t j;
|
||||
|
||||
if ( mixres != 0 )
|
||||
{
|
||||
int32_t mod = 1 << mixbits;
|
||||
int32_t m2;
|
||||
|
||||
/* matrixed stereo */
|
||||
m2 = mod - mixres;
|
||||
for ( j = 0; j < numSamples; j++ )
|
||||
{
|
||||
int32_t l, r;
|
||||
|
||||
l = (int32_t) ip[0];
|
||||
r = (int32_t) ip[1];
|
||||
ip += stride;
|
||||
u[j] = (mixres * l + m2 * r) >> mixbits;
|
||||
v[j] = l - r;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
/* Conventional separated stereo. */
|
||||
for ( j = 0; j < numSamples; j++ )
|
||||
{
|
||||
u[j] = (int32_t) ip[0];
|
||||
v[j] = (int32_t) ip[1];
|
||||
ip += stride;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 20-bit routines
|
||||
// - the 20 bits of data are left-justified in 3 bytes of storage but right-aligned for input/output predictor buffers
|
||||
|
||||
void mix20( uint8_t * in, uint32_t stride, int32_t * u, int32_t * v, int32_t numSamples, int32_t mixbits, int32_t mixres )
|
||||
{
|
||||
int32_t l, r;
|
||||
uint8_t * ip = in;
|
||||
int32_t j;
|
||||
|
||||
if ( mixres != 0 )
|
||||
{
|
||||
/* matrixed stereo */
|
||||
int32_t mod = 1 << mixbits;
|
||||
int32_t m2 = mod - mixres;
|
||||
|
||||
for ( j = 0; j < numSamples; j++ )
|
||||
{
|
||||
l = (int32_t)( ((uint32_t)ip[HBYTE] << 16) | ((uint32_t)ip[MBYTE] << 8) | (uint32_t)ip[LBYTE] );
|
||||
l = (l << 8) >> 12;
|
||||
ip += 3;
|
||||
|
||||
r = (int32_t)( ((uint32_t)ip[HBYTE] << 16) | ((uint32_t)ip[MBYTE] << 8) | (uint32_t)ip[LBYTE] );
|
||||
r = (r << 8) >> 12;
|
||||
ip += (stride - 1) * 3;
|
||||
|
||||
u[j] = (mixres * l + m2 * r) >> mixbits;
|
||||
v[j] = l - r;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
/* Conventional separated stereo. */
|
||||
for ( j = 0; j < numSamples; j++ )
|
||||
{
|
||||
l = (int32_t)( ((uint32_t)ip[HBYTE] << 16) | ((uint32_t)ip[MBYTE] << 8) | (uint32_t)ip[LBYTE] );
|
||||
u[j] = (l << 8) >> 12;
|
||||
ip += 3;
|
||||
|
||||
r = (int32_t)( ((uint32_t)ip[HBYTE] << 16) | ((uint32_t)ip[MBYTE] << 8) | (uint32_t)ip[LBYTE] );
|
||||
v[j] = (r << 8) >> 12;
|
||||
ip += (stride - 1) * 3;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 24-bit routines
|
||||
// - the 24 bits of data are right-justified in the input/output predictor buffers
|
||||
|
||||
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 )
|
||||
{
|
||||
int32_t l, r;
|
||||
uint8_t * ip = in;
|
||||
int32_t shift = bytesShifted * 8;
|
||||
uint32_t mask = (1ul << shift) - 1;
|
||||
int32_t j, k;
|
||||
|
||||
if ( mixres != 0 )
|
||||
{
|
||||
/* matrixed stereo */
|
||||
int32_t mod = 1 << mixbits;
|
||||
int32_t m2 = mod - mixres;
|
||||
|
||||
if ( bytesShifted != 0 )
|
||||
{
|
||||
for ( j = 0, k = 0; j < numSamples; j++, k += 2 )
|
||||
{
|
||||
l = (int32_t)( ((uint32_t)ip[HBYTE] << 16) | ((uint32_t)ip[MBYTE] << 8) | (uint32_t)ip[LBYTE] );
|
||||
l = (l << 8) >> 8;
|
||||
ip += 3;
|
||||
|
||||
r = (int32_t)( ((uint32_t)ip[HBYTE] << 16) | ((uint32_t)ip[MBYTE] << 8) | (uint32_t)ip[LBYTE] );
|
||||
r = (r << 8) >> 8;
|
||||
ip += (stride - 1) * 3;
|
||||
|
||||
shiftUV[k + 0] = (uint16_t)(l & mask);
|
||||
shiftUV[k + 1] = (uint16_t)(r & mask);
|
||||
|
||||
l >>= shift;
|
||||
r >>= shift;
|
||||
|
||||
u[j] = (mixres * l + m2 * r) >> mixbits;
|
||||
v[j] = l - r;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
for ( j = 0; j < numSamples; j++ )
|
||||
{
|
||||
l = (int32_t)( ((uint32_t)ip[HBYTE] << 16) | ((uint32_t)ip[MBYTE] << 8) | (uint32_t)ip[LBYTE] );
|
||||
l = (l << 8) >> 8;
|
||||
ip += 3;
|
||||
|
||||
r = (int32_t)( ((uint32_t)ip[HBYTE] << 16) | ((uint32_t)ip[MBYTE] << 8) | (uint32_t)ip[LBYTE] );
|
||||
r = (r << 8) >> 8;
|
||||
ip += (stride - 1) * 3;
|
||||
|
||||
u[j] = (mixres * l + m2 * r) >> mixbits;
|
||||
v[j] = l - r;
|
||||
}
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
/* Conventional separated stereo. */
|
||||
if ( bytesShifted != 0 )
|
||||
{
|
||||
for ( j = 0, k = 0; j < numSamples; j++, k += 2 )
|
||||
{
|
||||
l = (int32_t)( ((uint32_t)ip[HBYTE] << 16) | ((uint32_t)ip[MBYTE] << 8) | (uint32_t)ip[LBYTE] );
|
||||
l = (l << 8) >> 8;
|
||||
ip += 3;
|
||||
|
||||
r = (int32_t)( ((uint32_t)ip[HBYTE] << 16) | ((uint32_t)ip[MBYTE] << 8) | (uint32_t)ip[LBYTE] );
|
||||
r = (r << 8) >> 8;
|
||||
ip += (stride - 1) * 3;
|
||||
|
||||
shiftUV[k + 0] = (uint16_t)(l & mask);
|
||||
shiftUV[k + 1] = (uint16_t)(r & mask);
|
||||
|
||||
l >>= shift;
|
||||
r >>= shift;
|
||||
|
||||
u[j] = l;
|
||||
v[j] = r;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
for ( j = 0; j < numSamples; j++ )
|
||||
{
|
||||
l = (int32_t)( ((uint32_t)ip[HBYTE] << 16) | ((uint32_t)ip[MBYTE] << 8) | (uint32_t)ip[LBYTE] );
|
||||
u[j] = (l << 8) >> 8;
|
||||
ip += 3;
|
||||
|
||||
r = (int32_t)( ((uint32_t)ip[HBYTE] << 16) | ((uint32_t)ip[MBYTE] << 8) | (uint32_t)ip[LBYTE] );
|
||||
v[j] = (r << 8) >> 8;
|
||||
ip += (stride - 1) * 3;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 32-bit routines
|
||||
// - note that these really expect the internal data width to be < 32 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 "shift" buffers
|
||||
|
||||
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 )
|
||||
{
|
||||
int32_t * ip = in;
|
||||
int32_t shift = bytesShifted * 8;
|
||||
uint32_t mask = (1ul << shift) - 1;
|
||||
int32_t l, r;
|
||||
int32_t j, k;
|
||||
|
||||
if ( mixres != 0 )
|
||||
{
|
||||
int32_t mod = 1 << mixbits;
|
||||
int32_t m2;
|
||||
|
||||
//Assert( bytesShifted != 0 );
|
||||
|
||||
/* matrixed stereo with shift */
|
||||
m2 = mod - mixres;
|
||||
for ( j = 0, k = 0; j < numSamples; j++, k += 2 )
|
||||
{
|
||||
l = ip[0];
|
||||
r = ip[1];
|
||||
ip += stride;
|
||||
|
||||
shiftUV[k + 0] = (uint16_t)(l & mask);
|
||||
shiftUV[k + 1] = (uint16_t)(r & mask);
|
||||
|
||||
l >>= shift;
|
||||
r >>= shift;
|
||||
|
||||
u[j] = (mixres * l + m2 * r) >> mixbits;
|
||||
v[j] = l - r;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
if ( bytesShifted == 0 )
|
||||
{
|
||||
/* de-interleaving w/o shift */
|
||||
for ( j = 0; j < numSamples; j++ )
|
||||
{
|
||||
u[j] = ip[0];
|
||||
v[j] = ip[1];
|
||||
ip += stride;
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
/* de-interleaving with shift */
|
||||
for ( j = 0, k = 0; j < numSamples; j++, k += 2 )
|
||||
{
|
||||
l = ip[0];
|
||||
r = ip[1];
|
||||
ip += stride;
|
||||
|
||||
shiftUV[k + 0] = (uint16_t)(l & mask);
|
||||
shiftUV[k + 1] = (uint16_t)(r & mask);
|
||||
|
||||
l >>= shift;
|
||||
r >>= shift;
|
||||
|
||||
u[j] = l;
|
||||
v[j] = r;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// 20/24-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 )
|
||||
{
|
||||
uint8_t * ip = in;
|
||||
int32_t j;
|
||||
|
||||
for ( j = 0; j < numSamples; j++ )
|
||||
{
|
||||
int32_t val;
|
||||
|
||||
// 20-bit values are left-aligned in the 24-bit input buffer but right-aligned in the 32-bit output buffer
|
||||
val = (int32_t)( ((uint32_t)ip[HBYTE] << 16) | ((uint32_t)ip[MBYTE] << 8) | (uint32_t)ip[LBYTE] );
|
||||
out[j] = (val << 8) >> 12;
|
||||
ip += stride * 3;
|
||||
}
|
||||
}
|
||||
|
||||
void copy24ToPredictor( uint8_t * in, uint32_t stride, int32_t * out, int32_t numSamples )
|
||||
{
|
||||
uint8_t * ip = in;
|
||||
int32_t j;
|
||||
|
||||
for ( j = 0; j < numSamples; j++ )
|
||||
{
|
||||
int32_t val;
|
||||
|
||||
val = (int32_t)( ((uint32_t)ip[HBYTE] << 16) | ((uint32_t)ip[MBYTE] << 8) | (uint32_t)ip[LBYTE] );
|
||||
out[j] = (val << 8) >> 8;
|
||||
ip += stride * 3;
|
||||
}
|
||||
}
|
||||
80
alac/codec/matrixlib.h
Normal file
80
alac/codec/matrixlib.h
Normal file
|
|
@ -0,0 +1,80 @@
|
|||
/*
|
||||
* 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 */
|
||||
Loading…
Reference in a new issue