dlls/dsound/dsound_convert.c

   1 /* DirectSound format conversion and mixing routines
   2  *
   3  * Copyright 2007 Maarten Lankhorst
   4  * Copyright 2011 Owen Rudge for CodeWeavers
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 /* 8 bits is unsigned, the rest is signed.
  22  * First I tried to reuse existing stuff from alsa-lib, after that
  23  * didn't work, I gave up and just went for individual hacks.
  24  *
  25  * 24 bit is expensive to do, due to unaligned access.
  26  * In dlls/winex11.drv/dib_convert.c convert_888_to_0888_asis there is a way
  27  * around it, but I'm happy current code works, maybe something for later.
  28  *
  29  * The ^ 0x80 flips the signed bit, this is the conversion from
  30  * signed (-128.. 0.. 127) to unsigned (0...255)
  31  * This is only temporary: All 8 bit data should be converted to signed.
  32  * then when fed to the sound card, it should be converted to unsigned again.
  33  *
  34  * Sound is LITTLE endian
  35  */
  36
  37 #include "config.h"
  38 #include "wine/port.h"
  39
  40 #include <stdarg.h>
  41 #include <math.h>
  42
  43 #include "windef.h"
  44 #include "winbase.h"
  45 #include "mmsystem.h"
  46 #include "winternl.h"
  47 #include "wine/debug.h"
  48 #include "dsound.h"
  49 #include "dsound_private.h"
  50
  51 WINE_DEFAULT_DEBUG_CHANNEL(dsound);
  52
  53 #ifdef WORDS_BIGENDIAN
  54 #define le16(x) RtlUshortByteSwap((x))
  55 #define le32(x) RtlUlongByteSwap((x))
  56 #else
  57 #define le16(x) (x)
  58 #define le32(x) (x)
  59 #endif
  60
  61 static float get8(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel)
  62 {
  63     const BYTE* buf = dsb->buffer->memory;
  64     buf += pos + channel;
  65     return (buf[0] - 0x80) / (float)0x80;
  66 }
  67
  68 static float get16(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel)
  69 {
  70     const BYTE* buf = dsb->buffer->memory;
  71     const SHORT *sbuf = (const SHORT*)(buf + pos + 2 * channel);
  72     SHORT sample = (SHORT)le16(*sbuf);
  73     return sample / (float)0x8000;
  74 }
  75
  76 static float get24(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel)
  77 {
  78     LONG sample;
  79     const BYTE* buf = dsb->buffer->memory;
  80     buf += pos + 3 * channel;
  81     /* The next expression deliberately has an overflow for buf[2] >= 0x80,
  82        this is how negative values are made.
  83      */
  84     sample = (buf[0] << 8) | (buf[1] << 16) | (buf[2] << 24);
  85     return sample / (float)0x80000000U;
  86 }
  87
  88 static float get32(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel)
  89 {
  90     const BYTE* buf = dsb->buffer->memory;
  91     const LONG *sbuf = (const LONG*)(buf + pos + 4 * channel);
  92     LONG sample = le32(*sbuf);
  93     return sample / (float)0x80000000U;
  94 }
  95
  96 static float getieee32(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel)
  97 {
  98     const BYTE* buf = dsb->buffer->memory;
  99     const float *sbuf = (const float*)(buf + pos + 4 * channel);
 100     /* The value will be clipped later, when put into some non-float buffer */
 101     return *sbuf;
 102 }
 103
 104 const bitsgetfunc getbpp[5] = {get8, get16, get24, get32, getieee32};
 105
 106 float get_mono(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel)
 107 {
 108     DWORD channels = dsb->pwfx->nChannels;
 109     DWORD c;
 110     float val = 0;
 111     /* XXX: does Windows include LFE into the mix? */
 112     for (c = 0; c < channels; c++)
 113         val += dsb->get_aux(dsb, pos, c);
 114     val /= channels;
 115     return val;
 116 }
 117
 118 static inline unsigned char f_to_8(float value)
 119 {
 120     if(value <= -1.f)
 121         return 0;
 122     if(value >= 1.f * 0x7f / 0x80)
 123         return 0xFF;
 124     return lrintf((value + 1.f) * 0x80);
 125 }
 126
 127 static inline SHORT f_to_16(float value)
 128 {
 129     if(value <= -1.f)
 130         return 0x8000;
 131     if(value >= 1.f * 0x7FFF / 0x8000)
 132         return 0x7FFF;
 133     return le16(lrintf(value * 0x8000));
 134 }
 135
 136 static LONG f_to_24(float value)
 137 {
 138     if(value <= -1.f)
 139         return 0x80000000;
 140     if(value >= 1.f * 0x7FFFFF / 0x800000)
 141         return 0x7FFFFF00;
 142     return lrintf(value * 0x80000000U);
 143 }
 144
 145 static inline LONG f_to_32(float value)
 146 {
 147     if(value <= -1.f)
 148         return 0x80000000;
 149     if(value >= 1.f * 0x7FFFFFFF / 0x80000000U)  /* this rounds to 1.f */
 150         return 0x7FFFFFFF;
 151     return le32(lrintf(value * 0x80000000U));
 152 }
 153
 154 void putieee32(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
 155 {
 156     BYTE *buf = (BYTE *)dsb->device->tmp_buffer;
 157     float *fbuf = (float*)(buf + pos + sizeof(float) * channel);
 158     *fbuf = value;
 159 }
 160
 161 void putieee32_sum(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
 162 {
 163     BYTE *buf = (BYTE *)dsb->device->tmp_buffer;
 164     float *fbuf = (float*)(buf + pos + sizeof(float) * channel);
 165     *fbuf += value;
 166 }
 167
 168 void put_mono2stereo(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
 169 {
 170     dsb->put_aux(dsb, pos, 0, value);
 171     dsb->put_aux(dsb, pos, 1, value);
 172 }
 173
 174 void put_mono2quad(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
 175 {
 176     dsb->put_aux(dsb, pos, 0, value);
 177     dsb->put_aux(dsb, pos, 1, value);
 178     dsb->put_aux(dsb, pos, 2, value);
 179     dsb->put_aux(dsb, pos, 3, value);
 180 }
 181
 182 void put_stereo2quad(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
 183 {
 184     if (channel == 0) { /* Left */
 185         dsb->put_aux(dsb, pos, 0, value); /* Front left */
 186         dsb->put_aux(dsb, pos, 2, value); /* Back left */
 187     } else if (channel == 1) { /* Right */
 188         dsb->put_aux(dsb, pos, 1, value); /* Front right */
 189         dsb->put_aux(dsb, pos, 3, value); /* Back right */
 190     }
 191 }
 192
 193 void put_mono2surround51(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
 194 {
 195     dsb->put_aux(dsb, pos, 0, value);
 196     dsb->put_aux(dsb, pos, 1, value);
 197     dsb->put_aux(dsb, pos, 2, value);
 198     dsb->put_aux(dsb, pos, 3, value);
 199     dsb->put_aux(dsb, pos, 4, value);
 200     dsb->put_aux(dsb, pos, 5, value);
 201 }
 202
 203 void put_stereo2surround51(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
 204 {
 205     if (channel == 0) { /* Left */
 206         dsb->put_aux(dsb, pos, 0, value); /* Front left */
 207         dsb->put_aux(dsb, pos, 4, value); /* Back left */
 208
 209         dsb->put_aux(dsb, pos, 2, 0.0f); /* Mute front centre */
 210         dsb->put_aux(dsb, pos, 3, 0.0f); /* Mute LFE */
 211     } else if (channel == 1) { /* Right */
 212         dsb->put_aux(dsb, pos, 1, value); /* Front right */
 213         dsb->put_aux(dsb, pos, 5, value); /* Back right */
 214     }
 215 }
 216
 217 void put_surround512stereo(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
 218 {
 219     /* based on pulseaudio's downmix algorithm */
 220     switch(channel){
 221
 222     case 4: /* back left */
 223         value *= 0.056f; /* (1/9) / (sum of left volumes) */
 224         dsb->put_aux(dsb, pos, 0, value);
 225         break;
 226
 227     case 0: /* front left */
 228         value *= 0.503f; /* 1 / (sum of left volumes) */
 229         dsb->put_aux(dsb, pos, 0, value);
 230         break;
 231
 232     case 5: /* back right */
 233         value *= 0.056f; /* (1/9) / (sum of right volumes) */
 234         dsb->put_aux(dsb, pos, 1, value);
 235         break;
 236
 237     case 1: /* front right */
 238         value *= 0.503f; /* 1 / (sum of right volumes) */
 239         dsb->put_aux(dsb, pos, 1, value);
 240         break;
 241
 242     case 2: /* front centre */
 243         value *= 0.252f; /* 0.5 / (sum of left/right volumes) */
 244         dsb->put_aux(dsb, pos, 0, value);
 245         dsb->put_aux(dsb, pos, 1, value);
 246         break;
 247
 248     case 3: /* LFE */
 249         value *= 0.189f; /* 0.375 / (sum of left/right volumes) */
 250         dsb->put_aux(dsb, pos, 0, value);
 251         dsb->put_aux(dsb, pos, 1, value);
 252         break;
 253     }
 254 }
 255
 256 void put_quad2stereo(const IDirectSoundBufferImpl *dsb, DWORD pos, DWORD channel, float value)
 257 {
 258     /* based on pulseaudio's downmix algorithm */
 259     switch(channel){
 260
 261     case 2: /* back left */
 262         value *= 0.1f; /* (1/9) / (sum of left volumes) */
 263         dsb->put_aux(dsb, pos, 0, value);
 264         break;
 265
 266     case 0: /* front left */
 267         value *= 0.9f; /* 1 / (sum of left volumes) */
 268         dsb->put_aux(dsb, pos, 0, value);
 269         break;
 270
 271     case 3: /* back right */
 272         value *= 0.1f; /* (1/9) / (sum of right volumes) */
 273         dsb->put_aux(dsb, pos, 1, value);
 274         break;
 275
 276     case 1: /* front right */
 277         value *= 0.9f; /* 1 / (sum of right volumes) */
 278         dsb->put_aux(dsb, pos, 1, value);
 279         break;
 280     }
 281 }
 282
 283 void mixieee32(float *src, float *dst, unsigned samples)
 284 {
 285     TRACE("%p - %p %d\n", src, dst, samples);
 286     while (samples--)
 287         *(dst++) += *(src++);
 288 }
 289
 290 static void norm8(float *src, unsigned char *dst, unsigned samples)
 291 {
 292     TRACE("%p - %p %d\n", src, dst, samples);
 293     while (samples--)
 294     {
 295         *dst = f_to_8(*src);
 296         ++dst;
 297         ++src;
 298     }
 299 }
 300
 301 static void norm16(float *src, SHORT *dst, unsigned samples)
 302 {
 303     TRACE("%p - %p %d\n", src, dst, samples);
 304     while (samples--)
 305     {
 306         *dst = f_to_16(*src);
 307         ++dst;
 308         ++src;
 309     }
 310 }
 311
 312 static void norm24(float *src, BYTE *dst, unsigned samples)
 313 {
 314     TRACE("%p - %p %d\n", src, dst, samples);
 315     while (samples--)
 316     {
 317         LONG t = f_to_24(*src);
 318         dst[0] = (t >> 8) & 0xFF;
 319         dst[1] = (t >> 16) & 0xFF;
 320         dst[2] = t >> 24;
 321         dst += 3;
 322         ++src;
 323     }
 324 }
 325
 326 static void norm32(float *src, INT *dst, unsigned samples)
 327 {
 328     TRACE("%p - %p %d\n", src, dst, samples);
 329     while (samples--)
 330     {
 331         *dst = f_to_32(*src);
 332         ++dst;
 333         ++src;
 334     }
 335 }
 336
 337 const normfunc normfunctions[4] = {
 338     (normfunc)norm8,
 339     (normfunc)norm16,
 340     (normfunc)norm24,
 341     (normfunc)norm32,
 342 };