code.delx.au - pulseaudio/blob - src/pulsecore/svolume_arm.c

   1 /***
   2   This file is part of PulseAudio.
   3
   4   Copyright 2004-2006 Lennart Poettering
   5   Copyright 2009 Wim Taymans <wim.taymans@collabora.co.uk>
   6
   7   PulseAudio is free software; you can redistribute it and/or modify
   8   it under the terms of the GNU Lesser General Public License as published
   9   by the Free Software Foundation; either version 2.1 of the License,
  10   or (at your option) any later version.
  11
  12   PulseAudio is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with PulseAudio; if not, write to the Free Software
  19   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  20   USA.
  21 ***/
  22
  23 #ifdef HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <pulsecore/random.h>
  28 #include <pulsecore/macro.h>
  29 #include <pulsecore/endianmacros.h>
  30
  31 #include "cpu-arm.h"
  32
  33 #include "sample-util.h"
  34
  35 #if defined (__arm__) && defined (HAVE_ARMV6)
  36
  37 #define MOD_INC() \
  38     " subs  r0, r6, %2              \n\t" \
  39     " itt cs                        \n\t" \
  40     " addcs r0, %1                  \n\t" \
  41     " movcs r6, r0                  \n\t"
  42
  43 static void pa_volume_s16ne_arm(int16_t *samples, const int32_t *volumes, unsigned channels, unsigned length) {
  44     int32_t *ve;
  45
  46     /* Channels must be at least 4, and always a multiple of the original number.
  47      * This is also the max amount we overread the volume array, which should
  48      * have enough padding. */
  49     channels = channels == 3 ? 6 : PA_MAX (4U, channels);
  50     ve = volumes + channels;
  51
  52     __asm__ __volatile__ (
  53         " mov r6, %1                      \n\t" /* r6 = volumes */
  54         " mov %3, %3, LSR #1              \n\t" /* length /= sizeof (int16_t) */
  55         " tst %3, #1                      \n\t" /* check for odd samples */
  56         " beq  2f                         \n\t"
  57
  58         "1:                               \n\t" /* odd samples volumes */
  59         " ldr  r0, [r6], #4               \n\t" /* r0 = volume */
  60         " ldrh r2, [%0]                   \n\t" /* r2 = sample */
  61
  62         " smulwb r0, r0, r2               \n\t" /* r0 = (r0 * r2) >> 16 */
  63         " ssat r0, #16, r0                \n\t" /* r0 = PA_CLAMP(r0, 0x7FFF) */
  64
  65         " strh r0, [%0], #2               \n\t" /* sample = r0 */
  66
  67         MOD_INC()
  68
  69         "2:                               \n\t"
  70         " mov %3, %3, LSR #1              \n\t"
  71         " tst %3, #1                      \n\t" /* check for odd samples */
  72         " beq  4f                         \n\t"
  73
  74         "3:                               \n\t"
  75         " ldrd r2, [r6], #8               \n\t" /* 2 samples at a time */
  76         " ldr  r0, [%0]                   \n\t"
  77
  78         " smulwt r2, r2, r0               \n\t"
  79         " smulwb r3, r3, r0               \n\t"
  80
  81         " ssat r2, #16, r2                \n\t"
  82         " ssat r3, #16, r3                \n\t"
  83
  84         " pkhbt r0, r3, r2, LSL #16       \n\t"
  85         " str  r0, [%0], #4               \n\t"
  86
  87         MOD_INC()
  88
  89         "4:                               \n\t"
  90         " movs %3, %3, LSR #1             \n\t"
  91         " beq  6f                         \n\t"
  92
  93         "5:                               \n\t"
  94         " ldrd r2, [r6], #8               \n\t" /* 4 samples at a time */
  95         " ldrd r4, [r6], #8               \n\t"
  96         " ldrd r0, [%0]                   \n\t"
  97
  98         " smulwt r2, r2, r0               \n\t"
  99         " smulwb r3, r3, r0               \n\t"
 100         " smulwt r4, r4, r1               \n\t"
 101         " smulwb r5, r5, r1               \n\t"
 102
 103         " ssat r2, #16, r2                \n\t"
 104         " ssat r3, #16, r3                \n\t"
 105         " ssat r4, #16, r4                \n\t"
 106         " ssat r5, #16, r5                \n\t"
 107
 108         " pkhbt r0, r3, r2, LSL #16       \n\t"
 109         " pkhbt r1, r5, r4, LSL #16       \n\t"
 110         " strd  r0, [%0], #8              \n\t"
 111
 112         MOD_INC()
 113
 114         " subs %3, %3, #1                 \n\t"
 115         " bne 5b                          \n\t"
 116         "6:                               \n\t"
 117
 118         : "+r" (samples), "+r" (volumes), "+r" (ve), "+r" (length)
 119         :
 120         : "r6", "r5", "r4", "r3", "r2", "r1", "r0", "cc"
 121     );
 122 }
 123
 124 #endif /* defined (__arm__) && defined (HAVE_ARMV6) */
 125
 126 void pa_volume_func_init_arm(pa_cpu_arm_flag_t flags) {
 127 #if defined (__arm__) && defined (HAVE_ARMV6)
 128     pa_log_info("Initialising ARM optimized volume functions.");
 129
 130     pa_set_volume_func(PA_SAMPLE_S16NE, (pa_do_volume_func_t) pa_volume_s16ne_arm);
 131 #endif /* defined (__arm__) && defined (HAVE_ARMV6) */
 132 }