modules/arm_neon/audio_format.c

   1 /*****************************************************************************
   2  * audio_format.c: NEON assembly optimized audio conversions
   3  *****************************************************************************
   4  * Copyright (C) 2009 Rémi Denis-Courmont
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program 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
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  19  *****************************************************************************/
  20
  21 #ifdef HAVE_CONFIG_H
  22 # include "config.h"
  23 #endif
  24
  25 #include <vlc_common.h>
  26 #include <vlc_plugin.h>
  27 #include <vlc_aout.h>
  28 #include <vlc_filter.h>
  29 #include <vlc_cpu.h>
  30
  31 #include <assert.h>
  32
  33 static int Open (vlc_object_t *);
  34
  35 vlc_module_begin ()
  36     set_description (N_("ARM NEON audio format conversions") )
  37     set_capability ("audio filter", 20)
  38     set_callbacks (Open, NULL)
  39 vlc_module_end ()
  40
  41 //static block_t *Do_F32_S32 (filter_t *, block_t *);
  42 static block_t *Do_S32_S16 (filter_t *, block_t *);
  43
  44 static int Open (vlc_object_t *obj)
  45 {
  46     filter_t *filter = (filter_t *)obj;
  47
  48     if (!(vlc_CPU() & CPU_CAPABILITY_NEON))
  49         return VLC_EGENERIC;
  50     if (!AOUT_FMTS_SIMILAR (&filter->fmt_in.audio, &filter->fmt_out.audio))
  51         return VLC_EGENERIC;
  52
  53     switch (filter->fmt_in.audio.i_format)
  54     {
  55 #if 0
  56         case VLC_CODEC_FL32:
  57             switch (filter->fmt_out.audio.i_format)
  58             {
  59                 case VLC_CODEC_FI32:
  60                     filter->pf_audio_filter = Do_F32_S32;
  61                     break;
  62                 default:
  63                     return VLC_EGENERIC;
  64             }
  65             break;
  66 #endif
  67         case VLC_CODEC_FI32:
  68             switch (filter->fmt_out.audio.i_format)
  69             {
  70                 case VLC_CODEC_S16N:
  71                     filter->pf_audio_filter = Do_S32_S16;
  72                     break;
  73                 default:
  74                     return VLC_EGENERIC;
  75             }
  76             break;
  77         default:
  78             return VLC_EGENERIC;
  79     }
  80     return VLC_SUCCESS;
  81 }
  82
  83 #if 0
  84 /**
  85  * Single-precision floating point to signed fixed point conversion.
  86  */
  87 static block_t *Do_F32_S32 (filter_t *filter, block_t *inbuf)
  88 {
  89     unsigned nb_samples = inbuf->i_nb_samples
  90                      * aout_FormatNbChannels (&filter->fmt_in.audio);
  91     int32_t *outp = (int32_t *)inbuf->p_buffer;
  92     int32_t *endp = outp + nb_samples;
  93
  94     if (nb_samples & 1)
  95     {
  96         asm volatile (
  97             "vldr.32 s0, [%[outp]]\n"
  98             "vcvt.s32.f32 d0, d0, #28\n"
  99             "vstr.32 s0, [%[outp]]\n"
 100             :
 101             : [outp] "r" (outp)
 102             : "d0", "memory");
 103         outp++;
 104     }
 105
 106     if (nb_samples & 2)
 107         asm volatile (
 108             "vld1.f32 {d0}, [%[outp]]\n"
 109             "vcvt.s32.f32 d0, d0, #28\n"
 110             "vst1.s32 {d0}, [%[outp]]!\n"
 111             : [outp] "+r" (outp)
 112             :
 113             : "d0", "memory");
 114
 115     if (nb_samples & 4)
 116         asm volatile (
 117             "vld1.f32 {q0}, [%[outp]]\n"
 118             "vcvt.s32.f32 q0, q0, #28\n"
 119             "vst1.s32 {q0}, [%[outp]]!\n"
 120             : [outp] "+r" (outp)
 121             :
 122             : "q0", "memory");
 123
 124     while (outp != endp)
 125         asm volatile (
 126             "vld1.f32 {q0-q1}, [%[outp]]\n"
 127             "vcvt.s32.f32 q0, q0, #28\n"
 128             "vcvt.s32.f32 q1, q1, #28\n"
 129             "vst1.s32 {q0-q1}, [%[outp]]!\n"
 130             : [outp] "+r" (outp)
 131             :
 132             : "q0", "q1", "memory");
 133
 134     return inbuf;
 135 }
 136 #endif
 137
 138 void s32_s16_neon_unaligned (int16_t *out, const int32_t *in, unsigned nb);
 139 void s32_s16_neon (int16_t *out, const int32_t *in, unsigned nb);
 140
 141 /**
 142  * Signed 32-bits fixed point to signed 16-bits integer
 143  */
 144 static block_t *Do_S32_S16 (filter_t *filter, block_t *inbuf)
 145 {
 146     const int32_t *in = (int32_t *)inbuf->p_buffer;
 147     int16_t *out = (int16_t *)in;
 148     unsigned nb;
 149
 150     nb = ((-(uintptr_t)in) & 12) >> 2;
 151     out += nb; /* fix up misalignment */
 152     inbuf->p_buffer += 2 * nb;
 153
 154     s32_s16_neon_unaligned (out, in, nb);
 155     in += nb;
 156     out += nb;
 157
 158     nb = inbuf->i_nb_samples
 159          * aout_FormatNbChannels (&filter->fmt_in.audio) - nb;
 160     assert (!(((uintptr_t)in) & 15));
 161     assert (!(((uintptr_t)out) & 15));
 162
 163     s32_s16_neon (out, in, nb);
 164     inbuf->i_buffer /= 2;
 165     return inbuf;
 166 }