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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 Dave Chapman
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef __CODECLIB_H__
#define __CODECLIB_H__
#include <inttypes.h>
#include <string.h>
#include "config.h"
#include "codecs.h"
#include "mdct.h"
#include "fft.h"
extern struct codec_api *ci;
extern size_t mem_ptr;
extern size_t bufsize;
extern unsigned char* mp3buf; /* The actual MP3 buffer from Rockbox */
extern unsigned char* mallocbuf; /* The free space after the codec in the codec buffer */
extern unsigned char* filebuf; /* The rest of the MP3 buffer */
/* Standard library functions that are used by the codecs follow here */
/* Get these functions 'out of the way' of the standard functions. Not doing
* so confuses the cygwin linker, and maybe others. These functions need to
* be implemented elsewhere */
#define malloc(x) codec_malloc(x)
#define calloc(x,y) codec_calloc(x,y)
#define realloc(x,y) codec_realloc(x,y)
#define free(x) codec_free(x)
#undef alloca
#define alloca(x) __builtin_alloca(x)
void* codec_malloc(size_t size);
void* codec_calloc(size_t nmemb, size_t size);
void* codec_realloc(void* ptr, size_t size);
void codec_free(void* ptr);
void *memcpy(void *dest, const void *src, size_t n);
void *memset(void *s, int c, size_t n);
int memcmp(const void *s1, const void *s2, size_t n);
void *memmove(void *s1, const void *s2, size_t n);
size_t strlen(const char *s);
char *strcpy(char *dest, const char *src);
char *strcat(char *dest, const char *src);
/* on some platforms strcmp() seems to be a tricky define which
* breaks if we write down strcmp's prototype */
#undef strcmp
int strcmp(const char *s1, const char *s2);
void qsort(void *base, size_t nmemb, size_t size, int(*compar)(const void *, const void *));
/*MDCT library functions*/
/* -1- Tremor mdct */
extern void mdct_backward(int n, int32_t *in, int32_t *out);
/* -2- ffmpeg fft-based mdct */
extern void ff_imdct_half(unsigned int nbits, int32_t *output, const int32_t *input);
extern void ff_imdct_calc(unsigned int nbits, int32_t *output, const int32_t *input);
/*ffmpeg fft (can be used without mdct)*/
extern void ff_fft_calc_c(int nbits, FFTComplex *z);
#if !defined(CPU_ARM) || ARM_ARCH < 5
/* From libavutil/common.h */
extern const uint8_t bs_log2_tab[256] ICONST_ATTR;
extern const uint8_t bs_clz_tab[256] ICONST_ATTR;
#endif
#define BS_LOG2 0 /* default personality, equivalent floor(log2(x)) */
#define BS_CLZ 1 /* alternate personality, Count Leading Zeros */
#define BS_SHORT 2 /* input guaranteed not to exceed 16 bits */
#define BS_0_0 4 /* guarantee mapping of 0 input to 0 output */
/* Generic bit-scanning function, used to wrap platform CLZ instruction or
scan-and-lookup code, and to provide control over output for 0 inputs. */
static inline unsigned int bs_generic(unsigned int v, int mode)
{
#if defined(CPU_ARM) && ARM_ARCH >= 5
unsigned int r = __builtin_clz(v);
if (mode & BS_CLZ)
{
if (mode & BS_0_0)
r &= 31;
} else {
r = 31 - r;
/* If mode is constant, this is a single conditional instruction */
if (mode & BS_0_0 && (signed)r < 0)
r += 1;
}
#else
const uint8_t *bs_tab;
unsigned int r;
unsigned int n = v;
int inc;
/* Set up table, increment, and initial result value based on
personality. */
if (mode & BS_CLZ)
{
bs_tab = bs_clz_tab;
r = 24;
inc = -16;
} else {
bs_tab = bs_log2_tab;
r = 0;
inc = 16;
}
if (!(mode & BS_SHORT) && n >= 0x10000) {
n >>= 16;
r += inc;
}
if (n > 0xff) {
n >>= 8;
r += inc / 2;
}
#ifdef CPU_COLDFIRE
/* The high 24 bits of n are guaranteed empty after the above, so a
superfluous ext.b instruction can be saved by loading the LUT value over
n with asm */
asm volatile (
"move.b (%1,%0.l),%0"
: "+d" (n)
: "a" (bs_tab)
);
#else
n = bs_tab[n];
#endif
r += n;
if (mode & BS_CLZ && mode & BS_0_0 && v == 0)
r = 0;
#endif
return r;
}
/* TODO figure out if we really need to care about calculating
av_log2(0) */
#define av_log2(v) bs_generic(v, BS_0_0)
/* Various codec helper functions */
int codec_init(void);
void codec_set_replaygain(const struct mp3entry *id3);
#ifdef RB_PROFILE
void __cyg_profile_func_enter(void *this_fn, void *call_site)
NO_PROF_ATTR ICODE_ATTR;
void __cyg_profile_func_exit(void *this_fn, void *call_site)
NO_PROF_ATTR ICODE_ATTR;
#endif
#endif /* __CODECLIB_H__ */
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