391 lines
9.3 KiB
C
391 lines
9.3 KiB
C
|
/*
|
||
|
|
* 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_dec.c
|
||
|
|
|
||
|
|
Contains: ALAC mixing/matrixing decode 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 unmix16( int32_t * u, int32_t * v, int16_t * out, uint32_t stride, int32_t numSamples, int32_t mixbits, int32_t mixres )
|
||
|
|
{
|
||
|
|
int16_t * op = out;
|
||
|
|
int32_t j;
|
||
|
|
|
||
|
|
if ( mixres != 0 )
|
||
|
|
{
|
||
|
|
/* matrixed stereo */
|
||
|
|
for ( j = 0; j < numSamples; j++ )
|
||
|
|
{
|
||
|
|
int32_t l, r;
|
||
|
|
|
||
|
|
l = u[j] + v[j] - ((mixres * v[j]) >> mixbits);
|
||
|
|
r = l - v[j];
|
||
|
|
|
||
|
|
op[0] = (int16_t) l;
|
||
|
|
op[1] = (int16_t) r;
|
||
|
|
op += stride;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
/* Conventional separated stereo. */
|
||
|
|
for ( j = 0; j < numSamples; j++ )
|
||
|
|
{
|
||
|
|
op[0] = (int16_t) u[j];
|
||
|
|
op[1] = (int16_t) v[j];
|
||
|
|
op += 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 unmix20( int32_t * u, int32_t * v, uint8_t * out, uint32_t stride, int32_t numSamples, int32_t mixbits, int32_t mixres )
|
||
|
|
{
|
||
|
|
uint8_t * op = out;
|
||
|
|
int32_t j;
|
||
|
|
|
||
|
|
if ( mixres != 0 )
|
||
|
|
{
|
||
|
|
/* matrixed stereo */
|
||
|
|
for ( j = 0; j < numSamples; j++ )
|
||
|
|
{
|
||
|
|
int32_t l, r;
|
||
|
|
|
||
|
|
l = u[j] + v[j] - ((mixres * v[j]) >> mixbits);
|
||
|
|
r = l - v[j];
|
||
|
|
|
||
|
|
l <<= 4;
|
||
|
|
r <<= 4;
|
||
|
|
|
||
|
|
op[HBYTE] = (uint8_t)((l >> 16) & 0xffu);
|
||
|
|
op[MBYTE] = (uint8_t)((l >> 8) & 0xffu);
|
||
|
|
op[LBYTE] = (uint8_t)((l >> 0) & 0xffu);
|
||
|
|
op += 3;
|
||
|
|
|
||
|
|
op[HBYTE] = (uint8_t)((r >> 16) & 0xffu);
|
||
|
|
op[MBYTE] = (uint8_t)((r >> 8) & 0xffu);
|
||
|
|
op[LBYTE] = (uint8_t)((r >> 0) & 0xffu);
|
||
|
|
|
||
|
|
op += (stride - 1) * 3;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
/* Conventional separated stereo. */
|
||
|
|
for ( j = 0; j < numSamples; j++ )
|
||
|
|
{
|
||
|
|
int32_t val;
|
||
|
|
|
||
|
|
val = u[j] << 4;
|
||
|
|
op[HBYTE] = (uint8_t)((val >> 16) & 0xffu);
|
||
|
|
op[MBYTE] = (uint8_t)((val >> 8) & 0xffu);
|
||
|
|
op[LBYTE] = (uint8_t)((val >> 0) & 0xffu);
|
||
|
|
op += 3;
|
||
|
|
|
||
|
|
val = v[j] << 4;
|
||
|
|
op[HBYTE] = (uint8_t)((val >> 16) & 0xffu);
|
||
|
|
op[MBYTE] = (uint8_t)((val >> 8) & 0xffu);
|
||
|
|
op[LBYTE] = (uint8_t)((val >> 0) & 0xffu);
|
||
|
|
|
||
|
|
op += (stride - 1) * 3;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// 24-bit routines
|
||
|
|
// - the 24 bits of data are right-justified in the input/output predictor buffers
|
||
|
|
|
||
|
|
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 )
|
||
|
|
{
|
||
|
|
uint8_t * op = out;
|
||
|
|
int32_t shift = bytesShifted * 8;
|
||
|
|
int32_t l, r;
|
||
|
|
int32_t j, k;
|
||
|
|
|
||
|
|
if ( mixres != 0 )
|
||
|
|
{
|
||
|
|
/* matrixed stereo */
|
||
|
|
if ( bytesShifted != 0 )
|
||
|
|
{
|
||
|
|
for ( j = 0, k = 0; j < numSamples; j++, k += 2 )
|
||
|
|
{
|
||
|
|
l = u[j] + v[j] - ((mixres * v[j]) >> mixbits);
|
||
|
|
r = l - v[j];
|
||
|
|
|
||
|
|
l = (l << shift) | (uint32_t) shiftUV[k + 0];
|
||
|
|
r = (r << shift) | (uint32_t) shiftUV[k + 1];
|
||
|
|
|
||
|
|
op[HBYTE] = (uint8_t)((l >> 16) & 0xffu);
|
||
|
|
op[MBYTE] = (uint8_t)((l >> 8) & 0xffu);
|
||
|
|
op[LBYTE] = (uint8_t)((l >> 0) & 0xffu);
|
||
|
|
op += 3;
|
||
|
|
|
||
|
|
op[HBYTE] = (uint8_t)((r >> 16) & 0xffu);
|
||
|
|
op[MBYTE] = (uint8_t)((r >> 8) & 0xffu);
|
||
|
|
op[LBYTE] = (uint8_t)((r >> 0) & 0xffu);
|
||
|
|
|
||
|
|
op += (stride - 1) * 3;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
for ( j = 0; j < numSamples; j++ )
|
||
|
|
{
|
||
|
|
l = u[j] + v[j] - ((mixres * v[j]) >> mixbits);
|
||
|
|
r = l - v[j];
|
||
|
|
|
||
|
|
op[HBYTE] = (uint8_t)((l >> 16) & 0xffu);
|
||
|
|
op[MBYTE] = (uint8_t)((l >> 8) & 0xffu);
|
||
|
|
op[LBYTE] = (uint8_t)((l >> 0) & 0xffu);
|
||
|
|
op += 3;
|
||
|
|
|
||
|
|
op[HBYTE] = (uint8_t)((r >> 16) & 0xffu);
|
||
|
|
op[MBYTE] = (uint8_t)((r >> 8) & 0xffu);
|
||
|
|
op[LBYTE] = (uint8_t)((r >> 0) & 0xffu);
|
||
|
|
|
||
|
|
op += (stride - 1) * 3;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
/* Conventional separated stereo. */
|
||
|
|
if ( bytesShifted != 0 )
|
||
|
|
{
|
||
|
|
for ( j = 0, k = 0; j < numSamples; j++, k += 2 )
|
||
|
|
{
|
||
|
|
l = u[j];
|
||
|
|
r = v[j];
|
||
|
|
|
||
|
|
l = (l << shift) | (uint32_t) shiftUV[k + 0];
|
||
|
|
r = (r << shift) | (uint32_t) shiftUV[k + 1];
|
||
|
|
|
||
|
|
op[HBYTE] = (uint8_t)((l >> 16) & 0xffu);
|
||
|
|
op[MBYTE] = (uint8_t)((l >> 8) & 0xffu);
|
||
|
|
op[LBYTE] = (uint8_t)((l >> 0) & 0xffu);
|
||
|
|
op += 3;
|
||
|
|
|
||
|
|
op[HBYTE] = (uint8_t)((r >> 16) & 0xffu);
|
||
|
|
op[MBYTE] = (uint8_t)((r >> 8) & 0xffu);
|
||
|
|
op[LBYTE] = (uint8_t)((r >> 0) & 0xffu);
|
||
|
|
|
||
|
|
op += (stride - 1) * 3;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
for ( j = 0; j < numSamples; j++ )
|
||
|
|
{
|
||
|
|
int32_t val;
|
||
|
|
|
||
|
|
val = u[j];
|
||
|
|
op[HBYTE] = (uint8_t)((val >> 16) & 0xffu);
|
||
|
|
op[MBYTE] = (uint8_t)((val >> 8) & 0xffu);
|
||
|
|
op[LBYTE] = (uint8_t)((val >> 0) & 0xffu);
|
||
|
|
op += 3;
|
||
|
|
|
||
|
|
val = v[j];
|
||
|
|
op[HBYTE] = (uint8_t)((val >> 16) & 0xffu);
|
||
|
|
op[MBYTE] = (uint8_t)((val >> 8) & 0xffu);
|
||
|
|
op[LBYTE] = (uint8_t)((val >> 0) & 0xffu);
|
||
|
|
|
||
|
|
op += (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 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 )
|
||
|
|
{
|
||
|
|
int32_t * op = out;
|
||
|
|
int32_t shift = bytesShifted * 8;
|
||
|
|
int32_t l, r;
|
||
|
|
int32_t j, k;
|
||
|
|
|
||
|
|
if ( mixres != 0 )
|
||
|
|
{
|
||
|
|
//Assert( bytesShifted != 0 );
|
||
|
|
|
||
|
|
/* matrixed stereo with shift */
|
||
|
|
for ( j = 0, k = 0; j < numSamples; j++, k += 2 )
|
||
|
|
{
|
||
|
|
int32_t lt, rt;
|
||
|
|
|
||
|
|
lt = u[j];
|
||
|
|
rt = v[j];
|
||
|
|
|
||
|
|
l = lt + rt - ((mixres * rt) >> mixbits);
|
||
|
|
r = l - rt;
|
||
|
|
|
||
|
|
op[0] = (l << shift) | (uint32_t) shiftUV[k + 0];
|
||
|
|
op[1] = (r << shift) | (uint32_t) shiftUV[k + 1];
|
||
|
|
op += stride;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if ( bytesShifted == 0 )
|
||
|
|
{
|
||
|
|
/* interleaving w/o shift */
|
||
|
|
for ( j = 0; j < numSamples; j++ )
|
||
|
|
{
|
||
|
|
op[0] = u[j];
|
||
|
|
op[1] = v[j];
|
||
|
|
op += stride;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
/* interleaving with shift */
|
||
|
|
for ( j = 0, k = 0; j < numSamples; j++, k += 2 )
|
||
|
|
{
|
||
|
|
op[0] = (u[j] << shift) | (uint32_t) shiftUV[k + 0];
|
||
|
|
op[1] = (v[j] << shift) | (uint32_t) shiftUV[k + 1];
|
||
|
|
op += stride;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// 20/24-bit <-> 32-bit helper routines (not really matrixing but convenient to put here)
|
||
|
|
|
||
|
|
void copyPredictorTo24( int32_t * in, uint8_t * out, uint32_t stride, int32_t numSamples )
|
||
|
|
{
|
||
|
|
uint8_t * op = out;
|
||
|
|
int32_t j;
|
||
|
|
|
||
|
|
for ( j = 0; j < numSamples; j++ )
|
||
|
|
{
|
||
|
|
int32_t val = in[j];
|
||
|
|
|
||
|
|
op[HBYTE] = (uint8_t)((val >> 16) & 0xffu);
|
||
|
|
op[MBYTE] = (uint8_t)((val >> 8) & 0xffu);
|
||
|
|
op[LBYTE] = (uint8_t)((val >> 0) & 0xffu);
|
||
|
|
op += (stride * 3);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void copyPredictorTo24Shift( int32_t * in, uint16_t * shift, uint8_t * out, uint32_t stride, int32_t numSamples, int32_t bytesShifted )
|
||
|
|
{
|
||
|
|
uint8_t * op = out;
|
||
|
|
int32_t shiftVal = bytesShifted * 8;
|
||
|
|
int32_t j;
|
||
|
|
|
||
|
|
//Assert( bytesShifted != 0 );
|
||
|
|
|
||
|
|
for ( j = 0; j < numSamples; j++ )
|
||
|
|
{
|
||
|
|
int32_t val = in[j];
|
||
|
|
|
||
|
|
val = (val << shiftVal) | (uint32_t) shift[j];
|
||
|
|
|
||
|
|
op[HBYTE] = (uint8_t)((val >> 16) & 0xffu);
|
||
|
|
op[MBYTE] = (uint8_t)((val >> 8) & 0xffu);
|
||
|
|
op[LBYTE] = (uint8_t)((val >> 0) & 0xffu);
|
||
|
|
op += (stride * 3);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void copyPredictorTo20( int32_t * in, uint8_t * out, uint32_t stride, int32_t numSamples )
|
||
|
|
{
|
||
|
|
uint8_t * op = out;
|
||
|
|
int32_t j;
|
||
|
|
|
||
|
|
// 32-bit predictor values are right-aligned but 20-bit output values should be left-aligned
|
||
|
|
// in the 24-bit output buffer
|
||
|
|
for ( j = 0; j < numSamples; j++ )
|
||
|
|
{
|
||
|
|
int32_t val = in[j];
|
||
|
|
|
||
|
|
op[HBYTE] = (uint8_t)((val >> 12) & 0xffu);
|
||
|
|
op[MBYTE] = (uint8_t)((val >> 4) & 0xffu);
|
||
|
|
op[LBYTE] = (uint8_t)((val << 4) & 0xffu);
|
||
|
|
op += (stride * 3);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void copyPredictorTo32( int32_t * in, int32_t * out, uint32_t stride, int32_t numSamples )
|
||
|
|
{
|
||
|
|
int32_t i, j;
|
||
|
|
|
||
|
|
// this is only a subroutine to abstract the "iPod can only output 16-bit data" problem
|
||
|
|
for ( i = 0, j = 0; i < numSamples; i++, j += stride )
|
||
|
|
out[j] = in[i];
|
||
|
|
}
|
||
|
|
|
||
|
|
void copyPredictorTo32Shift( int32_t * in, uint16_t * shift, int32_t * out, uint32_t stride, int32_t numSamples, int32_t bytesShifted )
|
||
|
|
{
|
||
|
|
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;
|
||
|
|
}
|
||
|
|
}
|