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