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