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Sweden-Number/dlls/dsound/dsound_convert.c

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/* DirectSound format conversion and mixing routines
*
* Copyright 2007 Maarten Lankhorst
* Copyright 2011 Owen Rudge for CodeWeavers
*
* 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"
#include <stdarg.h>
#include <math.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 "dsound_private.h"
WINE_DEFAULT_DEBUG_CHANNEL(dsound);
#ifdef WORDS_BIGENDIAN
#define le16(x) RtlUshortByteSwap((x))
#define le32(x) RtlUlongByteSwap((x))
#else
#define le16(x) (x)
#define le32(x) (x)
#endif
static float get8(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel)
{
const BYTE* buf = dsb->buffer->memory;
buf += pos + channel;
return (buf[0] - 0x80) / (float)0x80;
}
static float get16(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel)
{
const BYTE* buf = dsb->buffer->memory;
const SHORT *sbuf = (const SHORT*)(buf + pos + 2 * channel);
SHORT sample = (SHORT)le16(*sbuf);
return sample / (float)0x8000;
}
static float get24(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel)
{
LONG sample;
const BYTE* buf = dsb->buffer->memory;
buf += pos + 3 * channel;
/* The next expression deliberately has an overflow for buf[2] >= 0x80,
this is how negative values are made.
*/
sample = (buf[0] << 8) | (buf[1] << 16) | (buf[2] << 24);
return sample / (float)0x80000000U;
}
static float get32(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel)
{
const BYTE* buf = dsb->buffer->memory;
const LONG *sbuf = (const LONG*)(buf + pos + 4 * channel);
LONG sample = le32(*sbuf);
return sample / (float)0x80000000U;
}
static float getieee32(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel)
{
const BYTE* buf = dsb->buffer->memory;
const float *sbuf = (const float*)(buf + pos + 4 * channel);
/* The value will be clipped later, when put into some non-float buffer */
return *sbuf;
}
const bitsgetfunc getbpp[5] = {get8, get16, get24, get32, getieee32};
float get_mono(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel)
{
DWORD channels = dsb->pwfx->nChannels;
DWORD c;
float val = 0;
/* XXX: does Windows include LFE into the mix? */
for (c = 0; c < channels; c++)
val += dsb->get_aux(dsb, pos, c);
val /= channels;
return val;
}
static void put8(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
{
BYTE* buf = dsb->device->tmp_buffer;
buf += pos + channel;
if(value <= -1.f)
*buf = 0;
else if(value >= 1.f * 0x7F / 0x80)
*buf = 0xFF;
else
*buf = lrintf((value + 1.f) * 0x80);
}
static void put16(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
{
BYTE* buf = dsb->device->tmp_buffer;
SHORT *sbuf = (SHORT*)(buf + pos + 2 * channel);
if(value <= -1.f)
*sbuf = 0x8000;
else if(value >= 1.f * 0x7FFF / 0x8000)
*sbuf = 0x7FFF;
else
*sbuf = le16(lrintf(value * 0x8000));
}
static void put24(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
{
BYTE* buf = dsb->device->tmp_buffer;
LONG t;
buf += pos + 3 * channel;
if(value <= -1.f)
t = 0x80000000;
else if(value >= 1.f * 0x7FFFFF / 0x800000)
t = 0x7FFFFF00;
else
t = lrintf(value * 0x80000000U);
buf[0] = (t >> 8) & 0xFF;
buf[1] = (t >> 16) & 0xFF;
buf[2] = (t >> 24) & 0xFF;
}
static void put32(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
{
BYTE* buf = dsb->device->tmp_buffer;
LONG *sbuf = (LONG*)(buf + pos + 4 * channel);
if(value <= -1.f)
*sbuf = 0x80000000;
else if(value >= 1.f * 0x7FFFFFFF / 0x80000000U) /* this rounds to 1.f */
*sbuf = 0x7FFFFFFF;
else
*sbuf = le32(lrintf(value * 0x80000000U));
}
const bitsputfunc putbpp[4] = {put8, put16, put24, put32};
void put_mono2stereo(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
{
dsb->put_aux(dsb, pos, 0, value);
dsb->put_aux(dsb, pos, 1, value);
}
static void mix8(signed char *src, INT *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++) += (signed char)((BYTE)*(src++) - (BYTE)0x80);
}
static void mix16(SHORT *src, INT *dst, unsigned len)
{
TRACE("%p - %p %d\n", src, dst, len);
len /= 2;
while (len--)
{
*dst += le16(*src);
++dst; ++src;
}
}
static void mix24(BYTE *src, INT *dst, unsigned len)
{
TRACE("%p - %p %d\n", src, dst, len);
len /= 3;
while (len--)
{
DWORD field;
field = ((DWORD)src[2] << 16) + ((DWORD)src[1] << 8) + (DWORD)src[0];
if (src[2] & 0x80)
field |= 0xFF000000U;
*(dst++) += field;
src += 3;
}
}
static void mix32(INT *src, LONGLONG *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(INT *src, signed char *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(INT *src, SHORT *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(INT *src, BYTE *dst, unsigned len)
{
TRACE("%p - %p %d\n", src, dst, len);
len /= 3;
while (len--)
{
if (*src <= -0x800000)
{
dst[0] = 0;
dst[1] = 0;
dst[2] = 0x80;
}
else if (*src > 0x7fffff)
{
dst[0] = 0xff;
dst[1] = 0xff;
dst[2] = 0x7f;
}
else
{
dst[0] = *src;
dst[1] = *src >> 8;
dst[2] = *src >> 16;
}
dst += 3;
++src;
}
}
static void norm32(LONGLONG *src, INT *dst, unsigned len)
{
TRACE("%p - %p %d\n", src, dst, len);
len /= 4;
while (len--)
{
*dst = le32(*src);
if (*src <= -(LONGLONG)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,
};
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