LXR qemu/audio/mixeng.c

   1/*
   2 * QEMU Mixing engine
   3 *
   4 * Copyright (c) 2004-2005 Vassili Karpov (malc)
   5 * Copyright (c) 1998 Fabrice Bellard
   6 *
   7 * Permission is hereby granted, free of charge, to any person obtaining a copy
   8 * of this software and associated documentation files (the "Software"), to deal
   9 * in the Software without restriction, including without limitation the rights
  10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11 * copies of the Software, and to permit persons to whom the Software is
  12 * furnished to do so, subject to the following conditions:
  13 *
  14 * The above copyright notice and this permission notice shall be included in
  15 * all copies or substantial portions of the Software.
  16 *
  17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23 * THE SOFTWARE.
  24 */
  25#include "qemu/osdep.h"
  26#include "qemu-common.h"
  27#include "qemu/bswap.h"
  28#include "audio.h"
  29
  30#define AUDIO_CAP "mixeng"
  31#include "audio_int.h"
  32
  33/* 8 bit */
  34#define ENDIAN_CONVERSION natural
  35#define ENDIAN_CONVERT(v) (v)
  36
  37/* Signed 8 bit */
  38#define BSIZE 8
  39#define ITYPE int
  40#define IN_MIN SCHAR_MIN
  41#define IN_MAX SCHAR_MAX
  42#define SIGNED
  43#define SHIFT 8
  44#include "mixeng_template.h"
  45#undef SIGNED
  46#undef IN_MAX
  47#undef IN_MIN
  48#undef BSIZE
  49#undef ITYPE
  50#undef SHIFT
  51
  52/* Unsigned 8 bit */
  53#define BSIZE 8
  54#define ITYPE uint
  55#define IN_MIN 0
  56#define IN_MAX UCHAR_MAX
  57#define SHIFT 8
  58#include "mixeng_template.h"
  59#undef IN_MAX
  60#undef IN_MIN
  61#undef BSIZE
  62#undef ITYPE
  63#undef SHIFT
  64
  65#undef ENDIAN_CONVERT
  66#undef ENDIAN_CONVERSION
  67
  68/* Signed 16 bit */
  69#define BSIZE 16
  70#define ITYPE int
  71#define IN_MIN SHRT_MIN
  72#define IN_MAX SHRT_MAX
  73#define SIGNED
  74#define SHIFT 16
  75#define ENDIAN_CONVERSION natural
  76#define ENDIAN_CONVERT(v) (v)
  77#include "mixeng_template.h"
  78#undef ENDIAN_CONVERT
  79#undef ENDIAN_CONVERSION
  80#define ENDIAN_CONVERSION swap
  81#define ENDIAN_CONVERT(v) bswap16 (v)
  82#include "mixeng_template.h"
  83#undef ENDIAN_CONVERT
  84#undef ENDIAN_CONVERSION
  85#undef SIGNED
  86#undef IN_MAX
  87#undef IN_MIN
  88#undef BSIZE
  89#undef ITYPE
  90#undef SHIFT
  91
  92/* Unsigned 16 bit */
  93#define BSIZE 16
  94#define ITYPE uint
  95#define IN_MIN 0
  96#define IN_MAX USHRT_MAX
  97#define SHIFT 16
  98#define ENDIAN_CONVERSION natural
  99#define ENDIAN_CONVERT(v) (v)
 100#include "mixeng_template.h"
 101#undef ENDIAN_CONVERT
 102#undef ENDIAN_CONVERSION
 103#define ENDIAN_CONVERSION swap
 104#define ENDIAN_CONVERT(v) bswap16 (v)
 105#include "mixeng_template.h"
 106#undef ENDIAN_CONVERT
 107#undef ENDIAN_CONVERSION
 108#undef IN_MAX
 109#undef IN_MIN
 110#undef BSIZE
 111#undef ITYPE
 112#undef SHIFT
 113
 114/* Signed 32 bit */
 115#define BSIZE 32
 116#define ITYPE int
 117#define IN_MIN INT32_MIN
 118#define IN_MAX INT32_MAX
 119#define SIGNED
 120#define SHIFT 32
 121#define ENDIAN_CONVERSION natural
 122#define ENDIAN_CONVERT(v) (v)
 123#include "mixeng_template.h"
 124#undef ENDIAN_CONVERT
 125#undef ENDIAN_CONVERSION
 126#define ENDIAN_CONVERSION swap
 127#define ENDIAN_CONVERT(v) bswap32 (v)
 128#include "mixeng_template.h"
 129#undef ENDIAN_CONVERT
 130#undef ENDIAN_CONVERSION
 131#undef SIGNED
 132#undef IN_MAX
 133#undef IN_MIN
 134#undef BSIZE
 135#undef ITYPE
 136#undef SHIFT
 137
 138/* Unsigned 32 bit */
 139#define BSIZE 32
 140#define ITYPE uint
 141#define IN_MIN 0
 142#define IN_MAX UINT32_MAX
 143#define SHIFT 32
 144#define ENDIAN_CONVERSION natural
 145#define ENDIAN_CONVERT(v) (v)
 146#include "mixeng_template.h"
 147#undef ENDIAN_CONVERT
 148#undef ENDIAN_CONVERSION
 149#define ENDIAN_CONVERSION swap
 150#define ENDIAN_CONVERT(v) bswap32 (v)
 151#include "mixeng_template.h"
 152#undef ENDIAN_CONVERT
 153#undef ENDIAN_CONVERSION
 154#undef IN_MAX
 155#undef IN_MIN
 156#undef BSIZE
 157#undef ITYPE
 158#undef SHIFT
 159
 160t_sample *mixeng_conv[2][2][2][3] = {
 161    {
 162        {
 163            {
 164                conv_natural_uint8_t_to_mono,
 165                conv_natural_uint16_t_to_mono,
 166                conv_natural_uint32_t_to_mono
 167            },
 168            {
 169                conv_natural_uint8_t_to_mono,
 170                conv_swap_uint16_t_to_mono,
 171                conv_swap_uint32_t_to_mono,
 172            }
 173        },
 174        {
 175            {
 176                conv_natural_int8_t_to_mono,
 177                conv_natural_int16_t_to_mono,
 178                conv_natural_int32_t_to_mono
 179            },
 180            {
 181                conv_natural_int8_t_to_mono,
 182                conv_swap_int16_t_to_mono,
 183                conv_swap_int32_t_to_mono
 184            }
 185        }
 186    },
 187    {
 188        {
 189            {
 190                conv_natural_uint8_t_to_stereo,
 191                conv_natural_uint16_t_to_stereo,
 192                conv_natural_uint32_t_to_stereo
 193            },
 194            {
 195                conv_natural_uint8_t_to_stereo,
 196                conv_swap_uint16_t_to_stereo,
 197                conv_swap_uint32_t_to_stereo
 198            }
 199        },
 200        {
 201            {
 202                conv_natural_int8_t_to_stereo,
 203                conv_natural_int16_t_to_stereo,
 204                conv_natural_int32_t_to_stereo
 205            },
 206            {
 207                conv_natural_int8_t_to_stereo,
 208                conv_swap_int16_t_to_stereo,
 209                conv_swap_int32_t_to_stereo,
 210            }
 211        }
 212    }
 213};
 214
 215f_sample *mixeng_clip[2][2][2][3] = {
 216    {
 217        {
 218            {
 219                clip_natural_uint8_t_from_mono,
 220                clip_natural_uint16_t_from_mono,
 221                clip_natural_uint32_t_from_mono
 222            },
 223            {
 224                clip_natural_uint8_t_from_mono,
 225                clip_swap_uint16_t_from_mono,
 226                clip_swap_uint32_t_from_mono
 227            }
 228        },
 229        {
 230            {
 231                clip_natural_int8_t_from_mono,
 232                clip_natural_int16_t_from_mono,
 233                clip_natural_int32_t_from_mono
 234            },
 235            {
 236                clip_natural_int8_t_from_mono,
 237                clip_swap_int16_t_from_mono,
 238                clip_swap_int32_t_from_mono
 239            }
 240        }
 241    },
 242    {
 243        {
 244            {
 245                clip_natural_uint8_t_from_stereo,
 246                clip_natural_uint16_t_from_stereo,
 247                clip_natural_uint32_t_from_stereo
 248            },
 249            {
 250                clip_natural_uint8_t_from_stereo,
 251                clip_swap_uint16_t_from_stereo,
 252                clip_swap_uint32_t_from_stereo
 253            }
 254        },
 255        {
 256            {
 257                clip_natural_int8_t_from_stereo,
 258                clip_natural_int16_t_from_stereo,
 259                clip_natural_int32_t_from_stereo
 260            },
 261            {
 262                clip_natural_int8_t_from_stereo,
 263                clip_swap_int16_t_from_stereo,
 264                clip_swap_int32_t_from_stereo
 265            }
 266        }
 267    }
 268};
 269
 270/*
 271 * August 21, 1998
 272 * Copyright 1998 Fabrice Bellard.
 273 *
 274 * [Rewrote completely the code of Lance Norskog And Sundry
 275 * Contributors with a more efficient algorithm.]
 276 *
 277 * This source code is freely redistributable and may be used for
 278 * any purpose.  This copyright notice must be maintained.
 279 * Lance Norskog And Sundry Contributors are not responsible for
 280 * the consequences of using this software.
 281 */
 282
 283/*
 284 * Sound Tools rate change effect file.
 285 */
 286/*
 287 * Linear Interpolation.
 288 *
 289 * The use of fractional increment allows us to use no buffer. It
 290 * avoid the problems at the end of the buffer we had with the old
 291 * method which stored a possibly big buffer of size
 292 * lcm(in_rate,out_rate).
 293 *
 294 * Limited to 16 bit samples and sampling frequency <= 65535 Hz. If
 295 * the input & output frequencies are equal, a delay of one sample is
 296 * introduced.  Limited to processing 32-bit count worth of samples.
 297 *
 298 * 1 << FRAC_BITS evaluating to zero in several places.  Changed with
 299 * an (unsigned long) cast to make it safe.  MarkMLl 2/1/99
 300 */
 301
 302/* Private data */
 303struct rate {
 304    uint64_t opos;
 305    uint64_t opos_inc;
 306    uint32_t ipos;              /* position in the input stream (integer) */
 307    struct st_sample ilast;          /* last sample in the input stream */
 308};
 309
 310/*
 311 * Prepare processing.
 312 */
 313void *st_rate_start (int inrate, int outrate)
 314{
 315    struct rate *rate = audio_calloc (AUDIO_FUNC, 1, sizeof (*rate));
 316
 317    if (!rate) {
 318        dolog ("Could not allocate resampler (%zu bytes)\n", sizeof (*rate));
 319        return NULL;
 320    }
 321
 322    rate->opos = 0;
 323
 324    /* increment */
 325    rate->opos_inc = ((uint64_t) inrate << 32) / outrate;
 326
 327    rate->ipos = 0;
 328    rate->ilast.l = 0;
 329    rate->ilast.r = 0;
 330    return rate;
 331}
 332
 333#define NAME st_rate_flow_mix
 334#define OP(a, b) a += b
 335#include "rate_template.h"
 336
 337#define NAME st_rate_flow
 338#define OP(a, b) a = b
 339#include "rate_template.h"
 340
 341void st_rate_stop (void *opaque)
 342{
 343    g_free (opaque);
 344}
 345
 346void mixeng_clear (struct st_sample *buf, int len)
 347{
 348    memset (buf, 0, len * sizeof (struct st_sample));
 349}
 350
 351void mixeng_volume (struct st_sample *buf, int len, struct mixeng_volume *vol)
 352{
 353    if (vol->mute) {
 354        mixeng_clear (buf, len);
 355        return;
 356    }
 357
 358    while (len--) {
 359#ifdef FLOAT_MIXENG
 360        buf->l = buf->l * vol->l;
 361        buf->r = buf->r * vol->r;
 362#else
 363        buf->l = (buf->l * vol->l) >> 32;
 364        buf->r = (buf->r * vol->r) >> 32;
 365#endif
 366        buf += 1;
 367    }
 368}
 369