1 /*****************************************************************************
2 * arm_neon.c: NEON assembly optimized audio conversions
3 *****************************************************************************
4 * Copyright (C) 2009 RĂ©mi Denis-Courmont
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.
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.
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 *****************************************************************************/
25 #include <vlc_common.h>
26 #include <vlc_plugin.h>
28 #include <vlc_filter.h>
33 static int Open (vlc_object_t *);
36 set_description (N_("ARM NEON audio format conversions") )
37 set_capability ("audio filter", 20)
38 set_callbacks (Open, NULL)
39 add_requirement (NEON)
42 static block_t *Do_F32_S32 (filter_t *, block_t *);
43 static block_t *Do_S32_S16 (filter_t *, block_t *);
45 static int Open (vlc_object_t *obj)
47 filter_t *filter = (filter_t *)obj;
49 if (!AOUT_FMTS_SIMILAR (&filter->fmt_in.audio, &filter->fmt_out.audio))
52 switch (filter->fmt_in.audio.i_format)
55 switch (filter->fmt_out.audio.i_format)
58 filter->pf_audio_filter = Do_F32_S32;
66 switch (filter->fmt_out.audio.i_format)
69 filter->pf_audio_filter = Do_S32_S16;
82 * Single-precision floating point to signed fixed point conversion.
84 static block_t *Do_F32_S32 (filter_t *filter, block_t *inbuf)
86 unsigned nb_samples = inbuf->i_nb_samples
87 * aout_FormatNbChannels (&filter->fmt_in.audio);
88 int32_t *outp = (int32_t *)inbuf->p_buffer;
89 int32_t *endp = outp + nb_samples;
94 "vldr.32 s0, [%[outp]]\n"
95 "vcvt.s32.f32 d0, d0, #28\n"
96 "vstr.32 s0, [%[outp]]\n"
105 "vld1.f32 {d0}, [%[outp]]\n"
106 "vcvt.s32.f32 d0, d0, #28\n"
107 "vst1.s32 {d0}, [%[outp]]!\n"
114 "vld1.f32 {q0}, [%[outp]]\n"
115 "vcvt.s32.f32 q0, q0, #28\n"
116 "vst1.s32 {q0}, [%[outp]]!\n"
123 "vld1.f32 {q0-q1}, [%[outp]]\n"
124 "vcvt.s32.f32 q0, q0, #28\n"
125 "vcvt.s32.f32 q1, q1, #28\n"
126 "vst1.s32 {q0-q1}, [%[outp]]!\n"
129 : "q0", "q1", "memory");
134 void s32_s16_neon_unaligned (int16_t *out, const int32_t *in, unsigned nb);
135 void s32_s16_neon (int16_t *out, const int32_t *in, unsigned nb);
138 * Signed 32-bits fixed point to signed 16-bits integer
140 static block_t *Do_S32_S16 (filter_t *filter, block_t *inbuf)
142 const int32_t *in = (int32_t *)inbuf->p_buffer;
143 int16_t *out = (int16_t *)in;
146 nb = ((-(uintptr_t)in) & 12) >> 2;
147 out += nb; /* fix up misalignment */
148 inbuf->p_buffer += 2 * nb;
150 s32_s16_neon_unaligned (out, in, nb);
154 nb = inbuf->i_nb_samples
155 * aout_FormatNbChannels (&filter->fmt_in.audio) - nb;
156 assert (!(((uintptr_t)in) & 15));
157 assert (!(((uintptr_t)out) & 15));
159 s32_s16_neon (out, in, nb);
160 inbuf->i_buffer /= 2;