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add alac source code - part 4 :3

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Ashley 2023-02-12 09:16:19 +00:00
parent 14eaf2c537
commit 0337286d4b
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362
alac/codec/ag_dec.c Normal file
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/*
* 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: ag_dec.c
Contains: Adaptive Golomb decode routines.
Copyright: (c) 2001-2011 Apple, Inc.
*/
#include "aglib.h"
#include "ALACBitUtilities.h"
#include "ALACAudioTypes.h"
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if __GNUC__ && TARGET_OS_MAC
#if __POWERPC__
#include <ppc_intrinsics.h>
#else
#include <libkern/OSByteOrder.h>
#endif
#endif
#define CODE_TO_LONG_MAXBITS 32
#define N_MAX_MEAN_CLAMP 0xffff
#define N_MEAN_CLAMP_VAL 0xffff
#define REPORT_VAL 40
#if __GNUC__
#define ALWAYS_INLINE __attribute__((always_inline))
#else
#define ALWAYS_INLINE
#endif
/* And on the subject of the CodeWarrior x86 compiler and inlining, I reworked a lot of this
to help the compiler out. In many cases this required manual inlining or a macro. Sorry
if it is ugly but the performance gains are well worth it.
- WSK 5/19/04
*/
void set_standard_ag_params(AGParamRecPtr params, uint32_t fullwidth, uint32_t sectorwidth)
{
/* Use
fullwidth = sectorwidth = numOfSamples, for analog 1-dimensional type-short data,
but use
fullwidth = full image width, sectorwidth = sector (patch) width
for such as image (2-dim.) data.
*/
set_ag_params( params, MB0, PB0, KB0, fullwidth, sectorwidth, MAX_RUN_DEFAULT );
}
void set_ag_params(AGParamRecPtr params, uint32_t m, uint32_t p, uint32_t k, uint32_t f, uint32_t s, uint32_t maxrun)
{
params->mb = params->mb0 = m;
params->pb = p;
params->kb = k;
params->wb = (1u<<params->kb)-1;
params->qb = QB-params->pb;
params->fw = f;
params->sw = s;
params->maxrun = maxrun;
}
#if PRAGMA_MARK
#pragma mark -
#endif
// note: implementing this with some kind of "count leading zeros" assembly is a big performance win
static inline int32_t lead( int32_t m )
{
long j;
unsigned long c = (1ul << 31);
for(j=0; j < 32; j++)
{
if((c & m) != 0)
break;
c >>= 1;
}
return (j);
}
#define arithmin(a, b) ((a) < (b) ? (a) : (b))
static inline int32_t ALWAYS_INLINE lg3a( int32_t x)
{
int32_t result;
x += 3;
result = lead(x);
return 31 - result;
}
static inline uint32_t ALWAYS_INLINE read32bit( uint8_t * buffer )
{
// embedded CPUs typically can't read unaligned 32-bit words so just read the bytes
uint32_t value;
value = ((uint32_t)buffer[0] << 24) | ((uint32_t)buffer[1] << 16) |
((uint32_t)buffer[2] << 8) | (uint32_t)buffer[3];
return value;
}
#if PRAGMA_MARK
#pragma mark -
#endif
#define get_next_fromlong(inlong, suff) ((inlong) >> (32 - (suff)))
static inline uint32_t ALWAYS_INLINE
getstreambits( uint8_t *in, int32_t bitoffset, int32_t numbits )
{
uint32_t load1, load2;
uint32_t byteoffset = bitoffset / 8;
uint32_t result;
//Assert( numbits <= 32 );
load1 = read32bit( in + byteoffset );
if ( (numbits + (bitoffset & 0x7)) > 32)
{
int32_t load2shift;
result = load1 << (bitoffset & 0x7);
load2 = (uint32_t) in[byteoffset+4];
load2shift = (8-(numbits + (bitoffset & 0x7)-32));
load2 >>= load2shift;
result >>= (32-numbits);
result |= load2;
}
else
{
result = load1 >> (32-numbits-(bitoffset & 7));
}
// a shift of >= "the number of bits in the type of the value being shifted" results in undefined
// behavior so don't try to shift by 32
if ( numbits != (sizeof(result) * 8) )
result &= ~(0xfffffffful << numbits);
return result;
}
static inline int32_t dyn_get(unsigned char *in, uint32_t *bitPos, uint32_t m, uint32_t k)
{
uint32_t tempbits = *bitPos;
uint32_t result;
uint32_t pre = 0, v;
uint32_t streamlong;
streamlong = read32bit( in + (tempbits >> 3) );
streamlong <<= (tempbits & 7);
/* find the number of bits in the prefix */
{
uint32_t notI = ~streamlong;
pre = lead( notI);
}
if(pre >= MAX_PREFIX_16)
{
pre = MAX_PREFIX_16;
tempbits += pre;
streamlong <<= pre;
result = get_next_fromlong(streamlong,MAX_DATATYPE_BITS_16);
tempbits += MAX_DATATYPE_BITS_16;
}
else
{
// all of the bits must fit within the long we have loaded
//Assert(pre+1+k <= 32);
tempbits += pre;
tempbits += 1;
streamlong <<= pre+1;
v = get_next_fromlong(streamlong, k);
tempbits += k;
result = pre*m + v-1;
if(v<2) {
result -= (v-1);
tempbits -= 1;
}
}
*bitPos = tempbits;
return result;
}
static inline int32_t dyn_get_32bit( uint8_t * in, uint32_t * bitPos, int32_t m, int32_t k, int32_t maxbits )
{
uint32_t tempbits = *bitPos;
uint32_t v;
uint32_t streamlong;
uint32_t result;
streamlong = read32bit( in + (tempbits >> 3) );
streamlong <<= (tempbits & 7);
/* find the number of bits in the prefix */
{
uint32_t notI = ~streamlong;
result = lead( notI);
}
if(result >= MAX_PREFIX_32)
{
result = getstreambits(in, tempbits+MAX_PREFIX_32, maxbits);
tempbits += MAX_PREFIX_32 + maxbits;
}
else
{
/* all of the bits must fit within the long we have loaded*/
//Assert(k<=14);
//Assert(result<MAX_PREFIX_32);
//Assert(result+1+k <= 32);
tempbits += result;
tempbits += 1;
if (k != 1)
{
streamlong <<= result+1;
v = get_next_fromlong(streamlong, k);
tempbits += k;
tempbits -= 1;
result = result*m;
if(v>=2)
{
result += (v-1);
tempbits += 1;
}
}
}
*bitPos = tempbits;
return result;
}
int32_t dyn_decomp( AGParamRecPtr params, BitBuffer * bitstream, int32_t * pc, int32_t numSamples, int32_t maxSize, uint32_t * outNumBits )
{
uint8_t *in;
int32_t *outPtr = pc;
uint32_t bitPos, startPos, maxPos;
uint32_t j, m, k, n, c, mz;
int32_t del, zmode;
uint32_t mb;
uint32_t pb_local = params->pb;
uint32_t kb_local = params->kb;
uint32_t wb_local = params->wb;
int32_t status;
RequireAction( (bitstream != nil) && (pc != nil) && (outNumBits != nil), return kALAC_ParamError; );
*outNumBits = 0;
in = bitstream->cur;
startPos = bitstream->bitIndex;
maxPos = bitstream->byteSize * 8;
bitPos = startPos;
mb = params->mb0;
zmode = 0;
c = 0;
status = ALAC_noErr;
while (c < numSamples)
{
// bail if we've run off the end of the buffer
RequireAction( bitPos < maxPos, status = kALAC_ParamError; goto Exit; );
m = (mb)>>QBSHIFT;
k = lg3a(m);
k = arithmin(k, kb_local);
m = (1<<k)-1;
n = dyn_get_32bit( in, &bitPos, m, k, maxSize );
// least significant bit is sign bit
{
uint32_t ndecode = n + zmode;
int32_t multiplier = (- (ndecode&1));
multiplier |= 1;
del = ((ndecode+1) >> 1) * (multiplier);
}
*outPtr++ = del;
c++;
mb = pb_local*(n+zmode) + mb - ((pb_local*mb)>>QBSHIFT);
// update mean tracking
if (n > N_MAX_MEAN_CLAMP)
mb = N_MEAN_CLAMP_VAL;
zmode = 0;
if (((mb << MMULSHIFT) < QB) && (c < numSamples))
{
zmode = 1;
k = lead(mb) - BITOFF+((mb+MOFF)>>MDENSHIFT);
mz = ((1<<k)-1) & wb_local;
n = dyn_get(in, &bitPos, mz, k);
RequireAction(c+n <= numSamples, status = kALAC_ParamError; goto Exit; );
for(j=0; j < n; j++)
{
*outPtr++ = 0;
++c;
}
if(n >= 65535)
zmode = 0;
mb = 0;
}
}
Exit:
*outNumBits = (bitPos - startPos);
BitBufferAdvance( bitstream, *outNumBits );
RequireAction( bitstream->cur <= bitstream->end, status = kALAC_ParamError; );
return status;
}

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alac/codec/ag_enc.c Normal file
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/*
* 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: ag_enc.c
Contains: Adaptive Golomb encode routines.
Copyright: (c) 2001-2011 Apple, Inc.
*/
#include "aglib.h"
#include "ALACBitUtilities.h"
#include "EndianPortable.h"
#include "ALACAudioTypes.h"
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#if __GNUC__ && TARGET_OS_MAC
#if __POWERPC__
#include <ppc_intrinsics.h>
#else
#include <libkern/OSByteOrder.h>
#endif
#endif
#define CODE_TO_LONG_MAXBITS 32
#define N_MAX_MEAN_CLAMP 0xffff
#define N_MEAN_CLAMP_VAL 0xffff
#define REPORT_VAL 40
#if __GNUC__
#define ALWAYS_INLINE __attribute__((always_inline))
#else
#define ALWAYS_INLINE
#endif
/* And on the subject of the CodeWarrior x86 compiler and inlining, I reworked a lot of this
to help the compiler out. In many cases this required manual inlining or a macro. Sorry
if it is ugly but the performance gains are well worth it.
- WSK 5/19/04
*/
// note: implementing this with some kind of "count leading zeros" assembly is a big performance win
static inline int32_t lead( int32_t m )
{
long j;
unsigned long c = (1ul << 31);
for(j=0; j < 32; j++)
{
if((c & m) != 0)
break;
c >>= 1;
}
return (j);
}
#define arithmin(a, b) ((a) < (b) ? (a) : (b))
static inline int32_t ALWAYS_INLINE lg3a( int32_t x)
{
int32_t result;
x += 3;
result = lead(x);
return 31 - result;
}
static inline int32_t ALWAYS_INLINE abs_func( int32_t a )
{
// note: the CW PPC intrinsic __abs() turns into these instructions so no need to try and use it
int32_t isneg = a >> 31;
int32_t xorval = a ^ isneg;
int32_t result = xorval-isneg;
return result;
}
static inline uint32_t ALWAYS_INLINE read32bit( uint8_t * buffer )
{
// embedded CPUs typically can't read unaligned 32-bit words so just read the bytes
uint32_t value;
value = ((uint32_t)buffer[0] << 24) | ((uint32_t)buffer[1] << 16) |
((uint32_t)buffer[2] << 8) | (uint32_t)buffer[3];
return value;
}
#if PRAGMA_MARK
#pragma mark -
#endif
static inline int32_t dyn_code(int32_t m, int32_t k, int32_t n, uint32_t *outNumBits)
{
uint32_t div, mod, de;
uint32_t numBits;
uint32_t value;
//Assert( n >= 0 );
div = n/m;
if(div >= MAX_PREFIX_16)
{
numBits = MAX_PREFIX_16 + MAX_DATATYPE_BITS_16;
value = (((1<<MAX_PREFIX_16)-1)<<MAX_DATATYPE_BITS_16) + n;
}
else
{
mod = n%m;
de = (mod == 0);
numBits = div + k + 1 - de;
value = (((1<<div)-1)<<(numBits-div)) + mod + 1 - de;
// if coding this way is bigger than doing escape, then do escape
if (numBits > MAX_PREFIX_16 + MAX_DATATYPE_BITS_16)
{
numBits = MAX_PREFIX_16 + MAX_DATATYPE_BITS_16;
value = (((1<<MAX_PREFIX_16)-1)<<MAX_DATATYPE_BITS_16) + n;
}
}
*outNumBits = numBits;
return (int32_t) value;
}
static inline int32_t dyn_code_32bit(int32_t maxbits, uint32_t m, uint32_t k, uint32_t n, uint32_t *outNumBits, uint32_t *outValue, uint32_t *overflow, uint32_t *overflowbits)
{
uint32_t div, mod, de;
uint32_t numBits;
uint32_t value;
int32_t didOverflow = 0;
div = n/m;
if (div < MAX_PREFIX_32)
{
mod = n - (m * div);
de = (mod == 0);
numBits = div + k + 1 - de;
value = (((1<<div)-1)<<(numBits-div)) + mod + 1 - de;
if (numBits > 25)
goto codeasescape;
}
else
{
codeasescape:
numBits = MAX_PREFIX_32;
value = (((1<<MAX_PREFIX_32)-1));
*overflow = n;
*overflowbits = maxbits;
didOverflow = 1;
}
*outNumBits = numBits;
*outValue = value;
return didOverflow;
}
static inline void ALWAYS_INLINE dyn_jam_noDeref(unsigned char *out, uint32_t bitPos, uint32_t numBits, uint32_t value)
{
uint32_t *i = (uint32_t *)(out + (bitPos >> 3));
uint32_t mask;
uint32_t curr;
uint32_t shift;
//Assert( numBits <= 32 );
curr = *i;
curr = Swap32NtoB( curr );
shift = 32 - (bitPos & 7) - numBits;
mask = ~0u >> (32 - numBits); // mask must be created in two steps to avoid compiler sequencing ambiguity
mask <<= shift;
value = (value << shift) & mask;
value |= curr & ~mask;
*i = Swap32BtoN( value );
}
static inline void ALWAYS_INLINE dyn_jam_noDeref_large(unsigned char *out, uint32_t bitPos, uint32_t numBits, uint32_t value)
{
uint32_t * i = (uint32_t *)(out + (bitPos>>3));
uint32_t w;
uint32_t curr;
uint32_t mask;
int32_t shiftvalue = (32 - (bitPos&7) - numBits);
//Assert(numBits <= 32);
curr = *i;
curr = Swap32NtoB( curr );
if (shiftvalue < 0)
{
uint8_t tailbyte;
uint8_t *tailptr;
w = value >> -shiftvalue;
mask = ~0u >> -shiftvalue;
w |= (curr & ~mask);
tailptr = ((uint8_t *)i) + 4;
tailbyte = (value << ((8+shiftvalue))) & 0xff;
*tailptr = (uint8_t)tailbyte;
}
else
{
mask = ~0u >> (32 - numBits);
mask <<= shiftvalue; // mask must be created in two steps to avoid compiler sequencing ambiguity
w = (value << shiftvalue) & mask;
w |= curr & ~mask;
}
*i = Swap32BtoN( w );
}
int32_t dyn_comp( AGParamRecPtr params, int32_t * pc, BitBuffer * bitstream, int32_t numSamples, int32_t bitSize, uint32_t * outNumBits )
{
unsigned char * out;
uint32_t bitPos, startPos;
uint32_t m, k, n, c, mz, nz;
uint32_t numBits;
uint32_t value;
int32_t del, zmode;
uint32_t overflow, overflowbits;
int32_t status;
// shadow the variables in params so there's not the dereferencing overhead
uint32_t mb, pb, kb, wb;
int32_t rowPos = 0;
int32_t rowSize = params->sw;
int32_t rowJump = (params->fw) - rowSize;
int32_t * inPtr = pc;
*outNumBits = 0;
RequireAction( (bitSize >= 1) && (bitSize <= 32), return kALAC_ParamError; );
out = bitstream->cur;
startPos = bitstream->bitIndex;
bitPos = startPos;
mb = params->mb = params->mb0;
pb = params->pb;
kb = params->kb;
wb = params->wb;
zmode = 0;
c=0;
status = ALAC_noErr;
while (c < numSamples)
{
m = mb >> QBSHIFT;
k = lg3a(m);
if ( k > kb)
{
k = kb;
}
m = (1<<k)-1;
del = *inPtr++;
rowPos++;
n = (abs_func(del) << 1) - ((del >> 31) & 1) - zmode;
//Assert( 32-lead(n) <= bitSize );
if ( dyn_code_32bit(bitSize, m, k, n, &numBits, &value, &overflow, &overflowbits) )
{
dyn_jam_noDeref(out, bitPos, numBits, value);
bitPos += numBits;
dyn_jam_noDeref_large(out, bitPos, overflowbits, overflow);
bitPos += overflowbits;
}
else
{
dyn_jam_noDeref(out, bitPos, numBits, value);
bitPos += numBits;
}
c++;
if ( rowPos >= rowSize)
{
rowPos = 0;
inPtr += rowJump;
}
mb = pb * (n + zmode) + mb - ((pb *mb)>>QBSHIFT);
// update mean tracking if it's overflowed
if (n > N_MAX_MEAN_CLAMP)
mb = N_MEAN_CLAMP_VAL;
zmode = 0;
RequireAction(c <= numSamples, status = kALAC_ParamError; goto Exit; );
if (((mb << MMULSHIFT) < QB) && (c < numSamples))
{
zmode = 1;
nz = 0;
while(c<numSamples && *inPtr == 0)
{
/* Take care of wrap-around globals. */
++inPtr;
++nz;
++c;
if ( ++rowPos >= rowSize)
{
rowPos = 0;
inPtr += rowJump;
}
if(nz >= 65535)
{
zmode = 0;
break;
}
}
k = lead(mb) - BITOFF+((mb+MOFF)>>MDENSHIFT);
mz = ((1<<k)-1) & wb;
value = dyn_code(mz, k, nz, &numBits);
dyn_jam_noDeref(out, bitPos, numBits, value);
bitPos += numBits;
mb = 0;
}
}
*outNumBits = (bitPos - startPos);
BitBufferAdvance( bitstream, *outNumBits );
Exit:
return status;
}

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alac/codec/aglib.h Normal file
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/*
* 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: aglib.h
Copyright: (C) 2001-2011 Apple, Inc.
*/
#ifndef AGLIB_H
#define AGLIB_H
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
#define QBSHIFT 9
#define QB (1<<QBSHIFT)
#define PB0 40
#define MB0 10
#define KB0 14
#define MAX_RUN_DEFAULT 255
#define MMULSHIFT 2
#define MDENSHIFT (QBSHIFT - MMULSHIFT - 1)
#define MOFF ((1<<(MDENSHIFT-2)))
#define BITOFF 24
/* Max. prefix of 1's. */
#define MAX_PREFIX_16 9
#define MAX_PREFIX_TOLONG_16 15
#define MAX_PREFIX_32 9
/* Max. bits in 16-bit data type */
#define MAX_DATATYPE_BITS_16 16
typedef struct AGParamRec
{
uint32_t mb, mb0, pb, kb, wb, qb;
uint32_t fw, sw;
uint32_t maxrun;
// fw = 1, sw = 1;
} AGParamRec, *AGParamRecPtr;
struct BitBuffer;
void set_standard_ag_params(AGParamRecPtr params, uint32_t fullwidth, uint32_t sectorwidth);
void set_ag_params(AGParamRecPtr params, uint32_t m, uint32_t p, uint32_t k, uint32_t f, uint32_t s, uint32_t maxrun);
int32_t dyn_comp(AGParamRecPtr params, int32_t * pc, struct BitBuffer * bitstream, int32_t numSamples, int32_t bitSize, uint32_t * outNumBits);
int32_t dyn_decomp(AGParamRecPtr params, struct BitBuffer * bitstream, int32_t * pc, int32_t numSamples, int32_t maxSize, uint32_t * outNumBits);
#ifdef __cplusplus
}
#endif
#endif //#ifndef AGLIB_H