1 files changed, 381 insertions, 0 deletions

diff --git a/lib/rbcodec/codecs/libfaad/bits.h b/lib/rbcodec/codecs/libfaad/bits.h
new file mode 100644
index 0000000000..f9417b8670
--- /dev/null
+++ b/lib/rbcodec/codecs/libfaad/bits.h
@@ -0,0 +1,381 @@
+/*
+** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
+** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com
+**
+** 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 program is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+** GNU General Public License for more details.
+**
+** You should have received a copy of the GNU General Public License
+** along with this program; if not, write to the Free Software
+** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+**
+** Any non-GPL usage of this software or parts of this software is strictly
+** forbidden.
+**
+** Commercial non-GPL licensing of this software is possible.
+** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
+**
+** $Id$
+**/
+
+#ifndef __BITS_H__
+#define __BITS_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "analysis.h"
+#ifdef ANALYSIS
+#include <stdio.h>
+#endif
+
+#define BYTE_NUMBIT 8
+#define bit2byte(a) ((a+7)/BYTE_NUMBIT)
+
+typedef struct _bitfile
+{
+    /* bit input */
+    uint32_t bufa;
+    uint32_t bufb;
+    uint32_t bits_left;
+    uint32_t buffer_size; /* size of the buffer in bytes */
+    uint32_t bytes_used;
+    uint8_t no_more_reading;
+    uint8_t error;
+    uint32_t *tail;
+    uint32_t *start;
+    void *buffer;
+} bitfile;
+
+/* rockbox: use asm optimized swap32()
+#define BSWAP(a) \
+    ((a) = ( ((a)&0xff)<<24) | (((a)&0xff00)<<8) | (((a)>>8)&0xff00) | (((a)>>24)&0xff))
+*/
+#define BSWAP(a) swap32(a)
+
+static uint32_t bitmask[] = {
+    0x0, 0x1, 0x3, 0x7, 0xF, 0x1F, 0x3F, 0x7F, 0xFF, 0x1FF,
+    0x3FF, 0x7FF, 0xFFF, 0x1FFF, 0x3FFF, 0x7FFF, 0xFFFF,
+    0x1FFFF, 0x3FFFF, 0x7FFFF, 0xFFFFF, 0x1FFFFF, 0x3FFFFF,
+    0x7FFFFF, 0xFFFFFF, 0x1FFFFFF, 0x3FFFFFF, 0x7FFFFFF,
+    0xFFFFFFF, 0x1FFFFFFF, 0x3FFFFFFF, 0x7FFFFFFF
+    /* added bitmask 32, correct?!?!?! */
+    , 0xFFFFFFFF
+};
+
+void faad_initbits(bitfile *ld, const void *buffer, const uint32_t buffer_size);
+void faad_endbits(bitfile *ld);
+/* not used
+void faad_initbits_rev(bitfile *ld, void *buffer,
+                       uint32_t bits_in_buffer);
+*/
+uint8_t faad_byte_align(bitfile *ld);
+uint32_t faad_get_processed_bits(bitfile *ld);
+void faad_rewindbits(bitfile *ld);
+uint8_t *faad_getbitbuffer(bitfile *ld, uint32_t bits
+                       DEBUGDEC);
+#ifdef DRM
+void *faad_origbitbuffer(bitfile *ld);
+uint32_t faad_origbitbuffer_size(bitfile *ld);
+#endif
+
+static INLINE uint32_t getdword(void *mem)
+{
+#ifndef ARCH_IS_BIG_ENDIAN
+    return BSWAP(*(uint32_t*)mem);
+#else
+    return *(uint32_t*)mem;
+#endif
+}
+
+static INLINE void faad_flushbits_ex(bitfile *ld, uint32_t bits)
+{
+    uint32_t tmp;
+
+    ld->bufa = ld->bufb;
+    if (ld->no_more_reading == 0)
+    {
+        tmp = getdword(ld->tail);
+        ld->tail++;
+    } else {
+        tmp = 0;
+    }
+    ld->bufb = tmp;
+    ld->bits_left += (32 - bits);
+    ld->bytes_used += 4;
+    if (ld->bytes_used == ld->buffer_size)
+        ld->no_more_reading = 1;
+    if (ld->bytes_used > ld->buffer_size)
+        ld->error = 1;
+}
+
+static INLINE uint32_t faad_showbits(bitfile *ld, uint32_t bits)
+{
+    if (bits <= ld->bits_left)
+    {
+        return (ld->bufa >> (ld->bits_left - bits)) & bitmask[bits];
+    }
+
+    bits -= ld->bits_left;
+    return ((ld->bufa & bitmask[ld->bits_left]) << bits) | (ld->bufb >> (32 - bits));
+}
+
+static INLINE void faad_flushbits(bitfile *ld, uint32_t bits)
+{
+    /* do nothing if error */
+    if (ld->error != 0)
+        return;
+
+    if (bits < ld->bits_left)
+    {
+        ld->bits_left -= bits;
+    } else {
+        faad_flushbits_ex(ld, bits);
+    }
+}
+
+/* return next n bits (right adjusted) */
+static uint32_t faad_getbits(bitfile *ld, uint32_t n DEBUGDEC)
+{
+    uint32_t ret;
+
+    if (ld->no_more_reading || n == 0)
+        return 0;
+
+    ret = faad_showbits(ld, n);
+    faad_flushbits(ld, n);
+
+#ifdef ANALYSIS
+    if (print)
+        fprintf(stdout, "%4d %2d bits, val: %4d, variable: %d %s\n", dbg_count++, n, ret, var, dbg);
+#endif
+
+    return ret;
+}
+
+static INLINE uint8_t faad_get1bit(bitfile *ld DEBUGDEC)
+{
+    uint8_t r;
+
+    if (ld->bits_left > 0)
+    {
+        ld->bits_left--;
+        r = (uint8_t)((ld->bufa >> ld->bits_left) & 1);
+        return r;
+    }
+
+    /* bits_left == 0 */
+#if 0
+    r = (uint8_t)(ld->bufb >> 31);
+    faad_flushbits_ex(ld, 1);
+#else
+    r = (uint8_t)faad_getbits(ld, 1);
+#endif
+    return r;
+}
+
+/* reversed bitreading routines */
+static INLINE uint32_t faad_showbits_rev(bitfile *ld, uint32_t bits)
+{
+    uint8_t i;
+    uint32_t B = 0;
+
+    if (bits <= ld->bits_left)
+    {
+        for (i = 0; i < bits; i++)
+        {
+            if (ld->bufa & (1 << (i + (32 - ld->bits_left))))
+                B |= (1 << (bits - i - 1));
+        }
+        return B;
+    } else {
+        for (i = 0; i < ld->bits_left; i++)
+        {
+            if (ld->bufa & (1 << (i + (32 - ld->bits_left))))
+                B |= (1 << (bits - i - 1));
+        }
+        for (i = 0; i < bits - ld->bits_left; i++)
+        {
+            if (ld->bufb & (1 << (i + (32-ld->bits_left))))
+                B |= (1 << (bits - ld->bits_left - i - 1));
+        }
+        return B;
+    }
+}
+
+static INLINE void faad_flushbits_rev(bitfile *ld, uint32_t bits)
+{
+    /* do nothing if error */
+    if (ld->error != 0)
+        return;
+
+    if (bits < ld->bits_left)
+    {
+        ld->bits_left -= bits;
+    } else {
+        uint32_t tmp;
+
+        ld->bufa = ld->bufb;
+        tmp = getdword(ld->start);
+        ld->bufb = tmp;
+        ld->start--;
+        ld->bits_left += (32 - bits);
+
+        ld->bytes_used += 4;
+        if (ld->bytes_used == ld->buffer_size)
+            ld->no_more_reading = 1;
+        if (ld->bytes_used > ld->buffer_size)
+            ld->error = 1;
+    }
+}
+
+static INLINE uint32_t faad_getbits_rev(bitfile *ld, uint32_t n
+                                        DEBUGDEC)
+{
+    uint32_t ret;
+
+    if (ld->no_more_reading)
+        return 0;
+
+    if (n == 0)
+        return 0;
+
+    ret = faad_showbits_rev(ld, n);
+    faad_flushbits_rev(ld, n);
+
+#ifdef ANALYSIS
+    if (print)
+        fprintf(stdout, "%4d %2d bits, val: %4d, variable: %d %s\n", dbg_count++, n, ret, var, dbg);
+#endif
+
+    return ret;
+}
+
+#ifdef DRM
+static uint8_t faad_check_CRC(bitfile *ld, uint16_t len)
+{
+    uint8_t CRC;
+    uint16_t r=255;  /* Initialize to all ones */
+
+    /* CRC polynome used x^8 + x^4 + x^3 + x^2 +1 */
+#define GPOLY 0435
+
+    faad_rewindbits(ld);
+
+    CRC = (uint8_t) ~faad_getbits(ld, 8
+        DEBUGVAR(1,999,"faad_check_CRC(): CRC"));          /* CRC is stored inverted */
+
+    for (; len>0; len--)
+    {
+        r = ( (r << 1) ^ (( ( faad_get1bit(ld
+            DEBUGVAR(1,998,""))  & 1) ^ ((r >> 7) & 1)) * GPOLY )) & 0xFF;
+    }
+
+    if (r != CRC)
+    {
+        return 8;
+    } else {
+        return 0;
+    }
+}
+
+static uint8_t tabFlipbits[256] = {
+    0,128,64,192,32,160,96,224,16,144,80,208,48,176,112,240,
+    8,136,72,200,40,168,104,232,24,152,88,216,56,184,120,248,
+    4,132,68,196,36,164,100,228,20,148,84,212,52,180,116,244,
+    12,140,76,204,44,172,108,236,28,156,92,220,60,188,124,252,
+    2,130,66,194,34,162,98,226,18,146,82,210,50,178,114,242,
+    10,138,74,202,42,170,106,234,26,154,90,218,58,186,122,250,
+    6,134,70,198,38,166,102,230,22,150,86,214,54,182,118,246,
+    14,142,78,206,46,174,110,238,30,158,94,222,62,190,126,254,
+    1,129,65,193,33,161,97,225,17,145,81,209,49,177,113,241,
+    9,137,73,201,41,169,105,233,25,153,89,217,57,185,121,249,
+    5,133,69,197,37,165,101,229,21,149,85,213,53,181,117,245,
+    13,141,77,205,45,173,109,237,29,157,93,221,61,189,125,253,
+    3,131,67,195,35,163,99,227,19,147,83,211,51,179,115,243,
+    11,139,75,203,43,171,107,235,27,155,91,219,59,187,123,251,
+    7,135,71,199,39,167,103,231,23,151,87,215,55,183,119,247,
+    15,143,79,207,47,175,111,239,31,159,95,223,63,191,127,255
+};
+#endif
+
+#ifdef ERROR_RESILIENCE
+
+/* Modified bit reading functions for HCR */
+
+typedef struct
+{
+    /* bit input */
+    uint32_t bufa;
+    uint32_t bufb;
+    int8_t len;
+} bits_t;
+
+
+static INLINE uint32_t showbits_hcr(bits_t *ld, uint8_t bits)
+{
+    if (bits == 0) return 0;
+    if (ld->len <= 32)
+    {
+        /* huffman_spectral_data_2 needs to read more than may be available, bits maybe
+           > ld->len, deliver 0 than */
+        if (ld->len >= bits)
+            return ((ld->bufa >> (ld->len - bits)) & (0xFFFFFFFF >> (32 - bits)));
+        else
+            return ((ld->bufa << (bits - ld->len)) & (0xFFFFFFFF >> (32 - bits)));
+    } else {
+        if ((ld->len - bits) < 32)
+        {
+            return ( (ld->bufb & (0xFFFFFFFF >> (64 - ld->len))) << (bits - ld->len + 32)) |
+                (ld->bufa >> (ld->len - bits));
+        } else {
+            return ((ld->bufb >> (ld->len - bits - 32)) & (0xFFFFFFFF >> (32 - bits)));
+        }
+    }
+}
+
+/* return 1 if position is outside of buffer, 0 otherwise */
+static INLINE int8_t flushbits_hcr( bits_t *ld, uint8_t bits)
+{
+    ld->len -= bits;
+
+    if (ld->len <0)
+    {
+        ld->len = 0;
+        return 1;
+    } else {
+        return 0;
+    }
+}
+
+static INLINE int8_t getbits_hcr(bits_t *ld, uint8_t n, uint32_t *result)
+{
+    *result = showbits_hcr(ld, n);
+    return flushbits_hcr(ld, n);
+}
+
+static INLINE int8_t get1bit_hcr(bits_t *ld, uint8_t *result)
+{
+    uint32_t res;
+    int8_t ret;
+
+    ret = getbits_hcr(ld, 1, &res);
+    *result = (int8_t)(res & 1);
+    return ret;
+}
+
+#endif
+
+
+#ifdef __cplusplus
+}
+#endif
+#endif