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/* DirectSound format conversion and mixing routines
*
* Copyright 2007 Maarten Lankhorst
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
/* 8 bits is unsigned, the rest is signed.
* First I tried to reuse existing stuff from alsa-lib, after that
* didn't work, I gave up and just went for individual hacks.
*
* 24 bit is expensive to do, due to unaligned access.
* In dlls/winex11.drv/dib_convert.c convert_888_to_0888_asis there is a way
* around it, but I'm happy current code works, maybe something for later.
*
* The ^ 0x80 flips the signed bit, this is the conversion from
* signed (-128.. 0.. 127) to unsigned (0...255)
* This is only temporary: All 8 bit data should be converted to signed.
* then when fed to the sound card, it should be converted to unsigned again.
*
* Sound is LITTLE endian
*/
#include "config.h"
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#include <stdarg.h>
#define NONAMELESSSTRUCT
#define NONAMELESSUNION
#include "windef.h"
#include "winbase.h"
#include "mmsystem.h"
#include "winternl.h"
#include "wine/debug.h"
#include "dsound.h"
#include "dsdriver.h"
#include "dsound_private.h"
WINE_DEFAULT_DEBUG_CHANNEL(dsound);
typedef struct {
uint8_t byte[3];
} int24_struct;
#ifdef WORDS_BIGENDIAN
#define le16(x) RtlUshortByteSwap((x))
#define le32(x) RtlUlongByteSwap((x))
#else
#define le16(x) (x)
#define le32(x) (x)
#endif
static void convert_8_to_8 (const void *src, void *dst)
{
uint8_t *dest = dst;
*dest = *(uint8_t*)src;
}
static void convert_8_to_16 (const void *src, void *dst)
{
uint16_t dest = *(uint8_t*)src, *dest16 = dst;
*dest16 = le16(dest * 257 - 32768);
}
static void convert_8_to_24 (const void *src, void *dst)
{
uint8_t dest = *(uint8_t*)src;
int24_struct *dest24 = dst;
dest24->byte[0] = dest;
dest24->byte[1] = dest;
dest24->byte[2] = dest - 0x80;
}
static void convert_8_to_32 (const void *src, void *dst)
{
uint32_t dest = *(uint8_t*)src, *dest32 = dst;
*dest32 = le32(dest * 16843009 - 2147483648U);
}
static void convert_16_to_8 (const void *src, void *dst)
{
uint8_t *dst8 = dst;
*dst8 = (le16(*(uint16_t*)src)) / 256;
*dst8 -= 0x80;
}
static void convert_16_to_16 (const void *src, void *dst)
{
uint16_t *dest = dst;
*dest = *(uint16_t*)src;
}
static void convert_16_to_24 (const void *src, void *dst)
{
uint16_t dest = le16(*(uint16_t*)src);
int24_struct *dest24 = dst;
dest24->byte[0] = dest / 256;
dest24->byte[1] = dest;
dest24->byte[2] = dest / 256;
}
static void convert_16_to_32 (const void *src, void *dst)
{
uint32_t dest = *(uint16_t*)src, *dest32 = dst;
*dest32 = dest * 65537;
}
static void convert_24_to_8 (const void *src, void *dst)
{
uint8_t *dst8 = dst;
*dst8 = ((int24_struct*)src)->byte[2];
}
static void convert_24_to_16 (const void *src, void *dst)
{
uint16_t *dest16 = dst;
const int24_struct *source = src;
*dest16 = le16(source->byte[2] * 256 + source->byte[1]);
}
static void convert_24_to_24 (const void *src, void *dst)
{
int24_struct *dest24 = dst;
const int24_struct *src24 = src;
*dest24 = *src24;
}
static void convert_24_to_32 (const void *src, void *dst)
{
uint32_t *dest32 = dst;
const int24_struct *source = src;
*dest32 = le32(source->byte[2] * 16777217 + source->byte[1] * 65536 + source->byte[0] * 256);
}
static void convert_32_to_8 (const void *src, void *dst)
{
uint8_t *dst8 = dst;
*dst8 = (le32(*(uint32_t*)src) / 16777216);
*dst8 -= 0x80;
}
static void convert_32_to_16 (const void *src, void *dst)
{
uint16_t *dest16 = dst;
*dest16 = le16(le32(*(uint32_t*)src) / 65536);
}
static void convert_32_to_24 (const void *src, void *dst)
{
uint32_t dest = le32(*(uint32_t*)dst);
int24_struct *dest24 = dst;
dest24->byte[0] = dest / 256;
dest24->byte[1] = dest / 65536;
dest24->byte[2] = dest / 16777216;
}
static void convert_32_to_32 (const void *src, void *dst)
{
uint32_t *dest = dst;
*dest = *(uint32_t*)src;
}
const bitsconvertfunc convertbpp[4][4] = {
{ convert_8_to_8, convert_8_to_16, convert_8_to_24, convert_8_to_32 },
{ convert_16_to_8, convert_16_to_16, convert_16_to_24, convert_16_to_32 },
{ convert_24_to_8, convert_24_to_16, convert_24_to_24, convert_24_to_32 },
{ convert_32_to_8, convert_32_to_16, convert_32_to_24, convert_32_to_32 },
};
static void mix8(int8_t *src, int32_t *dst, unsigned len)
{
TRACE("%p - %p %d\n", src, dst, len);
while (len--)
/* 8-bit WAV is unsigned, it's here converted to signed, normalize function will convert it back again */
*(dst++) += (int8_t)((uint8_t)*(src++) - (uint8_t)0x80);
}
static void mix16(int16_t *src, int32_t *dst, unsigned len)
{
TRACE("%p - %p %d\n", src, dst, len);
len /= 2;
while (len--)
{
*dst += le16(*src);
++dst; ++src;
}
}
static void mix24(int24_struct *src, int32_t *dst, unsigned len)
{
TRACE("%p - %p %d\n", src, dst, len);
len /= 3;
while (len--)
{
uint32_t field;
field = ((unsigned)src->byte[2] << 16) + ((unsigned)src->byte[1] << 8) + (unsigned)src->byte[0];
if (src->byte[2] & 0x80)
field |= 0xFF000000U;
*(dst++) += field;
++src;
}
}
static void mix32(int32_t *src, int64_t *dst, unsigned len)
{
TRACE("%p - %p %d\n", src, dst, len);
len /= 4;
while (len--)
*(dst++) += le32(*(src++));
}
const mixfunc mixfunctions[4] = {
(mixfunc)mix8,
(mixfunc)mix16,
(mixfunc)mix24,
(mixfunc)mix32
};
static void norm8(int32_t *src, int8_t *dst, unsigned len)
{
TRACE("%p - %p %d\n", src, dst, len);
while (len--)
{
*dst = (*src) + 0x80;
if (*src < -0x80)
*dst = 0;
else if (*src > 0x7f)
*dst = 0xff;
++dst;
++src;
}
}
static void norm16(int32_t *src, int16_t *dst, unsigned len)
{
TRACE("%p - %p %d\n", src, dst, len);
len /= 2;
while (len--)
{
*dst = le16(*src);
if (*src <= -0x8000)
*dst = le16(0x8000);
else if (*src > 0x7fff)
*dst = le16(0x7fff);
++dst;
++src;
}
}
static void norm24(int32_t *src, int24_struct *dst, unsigned len)
{
TRACE("%p - %p %d\n", src, dst, len);
len /= 3;
while (len--)
{
if (*src <= -0x800000)
{
dst->byte[0] = 0;
dst->byte[1] = 0;
dst->byte[2] = 0x80;
}
else if (*src > 0x7fffff)
{
dst->byte[0] = 0xff;
dst->byte[1] = 0xff;
dst->byte[2] = 0x7f;
}
else
{
dst->byte[0] = *src;
dst->byte[1] = *src >> 8;
dst->byte[2] = *src >> 16;
}
++dst;
++src;
}
}
static void norm32(int64_t *src, int32_t *dst, unsigned len)
{
TRACE("%p - %p %d\n", src, dst, len);
len /= 4;
while (len--)
{
*dst = le32(*src);
if (*src <= -(int64_t)0x80000000)
*dst = le32(0x80000000);
else if (*src > 0x7fffffff)
*dst = le32(0x7fffffff);
++dst;
++src;
}
}
const normfunc normfunctions[4] = {
(normfunc)norm8,
(normfunc)norm16,
(normfunc)norm24,
(normfunc)norm32,
};