code.delx.au - pulseaudio/blob - src/pulsecore/sconv-s16le.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of PulseAudio.
   5
   6   Copyright 2004-2006 Lennart Poettering
   7
   8   PulseAudio is free software; you can redistribute it and/or modify
   9   it under the terms of the GNU Lesser General Public License as published
  10   by the Free Software Foundation; either version 2 of the License,
  11   or (at your option) any later version.
  12
  13   PulseAudio is distributed in the hope that it will be useful, but
  14   WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16   General Public License for more details.
  17
  18   You should have received a copy of the GNU Lesser General Public License
  19   along with PulseAudio; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21   USA.
  22 ***/
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include <config.h>
  26 #endif
  27
  28 #include <assert.h>
  29 #include <inttypes.h>
  30
  31 #include <liboil/liboilfuncs.h>
  32
  33 #include <pulsecore/sconv.h>
  34 #include <pulsecore/log.h>
  35
  36 #include "endianmacros.h"
  37
  38 #include "sconv-s16le.h"
  39
  40 #ifndef INT16_FROM
  41 #define INT16_FROM INT16_FROM_LE
  42 #endif
  43
  44 #ifndef INT16_TO
  45 #define INT16_TO INT16_TO_LE
  46 #endif
  47
  48 #ifndef SWAP_WORDS
  49 #ifdef WORDS_BIGENDIAN
  50 #define SWAP_WORDS 1
  51 #else
  52 #define SWAP_WORDS 0
  53 #endif
  54 #endif
  55
  56 void pa_sconv_s16le_to_float32ne(unsigned n, const void *a, float *b) {
  57     const int16_t *ca = a;
  58
  59     assert(a);
  60     assert(b);
  61
  62 #if SWAP_WORDS == 1
  63
  64     for (; n > 0; n--) {
  65         int16_t s = *(ca++);
  66         *(b++) = ((float) INT16_FROM(s))/0x7FFF;
  67     }
  68
  69 #else
  70 {
  71     static const double add = 0, factor = 1.0/0x7FFF;
  72     oil_scaleconv_f32_s16(b, ca, n, &add, &factor);
  73 }
  74 #endif
  75 }
  76
  77 void pa_sconv_s16le_from_float32ne(unsigned n, const float *a, void *b) {
  78     int16_t *cb = b;
  79
  80     assert(a);
  81     assert(b);
  82
  83 #if SWAP_WORDS == 1
  84
  85     for (; n > 0; n--) {
  86         int16_t s;
  87         float v = *(a++);
  88
  89         if (v > 1)
  90             v = 1;
  91
  92         if (v < -1)
  93             v = -1;
  94
  95         s = (int16_t) (v * 0x7FFF);
  96         *(cb++) = INT16_TO(s);
  97     }
  98
  99 #else
 100 {
 101     static const double add = 0, factor = 0x7FFF;
 102     oil_scaleconv_s16_f32(cb, a, n, &add, &factor);
 103 }
 104 #endif
 105 }