summaryrefslogtreecommitdiffstats
path: root/apps/codecs/lib/codeclib.h
blob: d0f985b8e1c6044523d88304bb364a9505d2e7cd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
/***************************************************************************
 *             __________               __   ___.
 *   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;

/* 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__ */