audio/mixeng.h

   1 /*
   2  * QEMU Mixing engine header
   3  *
   4  * Copyright (c) 2004-2005 Vassili Karpov (malc)
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 #ifndef QEMU_MIXENG_H
  26 #define QEMU_MIXENG_H
  27
  28 #ifdef FLOAT_MIXENG
  29 typedef float mixeng_real;
  30 struct mixeng_volume { int mute; mixeng_real r; mixeng_real l; };
  31 struct st_sample { mixeng_real l; mixeng_real r; };
  32 #else
  33 struct mixeng_volume { int mute; int64_t r; int64_t l; };
  34 struct st_sample { int64_t l; int64_t r; };
  35 #endif
  36 typedef struct st_sample st_sample;
  37
  38 typedef void (t_sample) (struct st_sample *dst, const void *src, int samples);
  39 typedef void (f_sample) (void *dst, const struct st_sample *src, int samples);
  40
  41 /* indices: [stereo][signed][swap endiannes][8, 16 or 32-bits] */
  42 extern t_sample *mixeng_conv[2][2][2][3];
  43 extern f_sample *mixeng_clip[2][2][2][3];
  44
  45 /* indices: [stereo] */
  46 extern t_sample *mixeng_conv_float[2];
  47 extern f_sample *mixeng_clip_float[2];
  48
  49 void *st_rate_start (int inrate, int outrate);
  50 void st_rate_flow(void *opaque, st_sample *ibuf, st_sample *obuf,
  51                   size_t *isamp, size_t *osamp);
  52 void st_rate_flow_mix(void *opaque, st_sample *ibuf, st_sample *obuf,
  53                       size_t *isamp, size_t *osamp);
  54 void st_rate_stop (void *opaque);
  55 void mixeng_clear (struct st_sample *buf, int len);
  56 void mixeng_volume (struct st_sample *buf, int len, struct mixeng_volume *vol);
  57
  58 #endif /* QEMU_MIXENG_H */