2 This file is part of PulseAudio.
4 Copyright 2012 Peter Meerwald <p.meerwald@bct-electronic.com>
6 PulseAudio is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 2.1 of the License,
9 or (at your option) any later version.
11 PulseAudio is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
21 #include <pulse/rtclock.h>
23 #include <pulsecore/macro.h>
24 #include <pulsecore/endianmacros.h>
32 static void pa_sconv_s16le_from_f32ne_neon(unsigned n
, const float *src
, int16_t *dst
) {
35 __asm__
__volatile__ (
36 "movs %[n], %[n], lsr #2 \n\t"
40 "vld1.32 {q0}, [%[src]]! \n\t"
41 "vcvt.s32.f32 q0, q0, #31 \n\t" /* s32<-f32 as 16:16 fixed-point, with implicit multiplication by 32768 */
42 "vqrshrn.s32 d0, q0, #16 \n\t" /* shift, round, narrow */
43 "subs %[n], %[n], #1 \n\t"
44 "vst1.16 {d0}, [%[dst]]! \n\t"
49 : [dst
] "+r" (dst
), [src
] "+r" (src
), [n
] "+r" (n
) /* output operands (or input operands that get modified) */
50 : /* input operands */
51 : "memory", "cc", "q0" /* clobber list */
56 *dst
++ = (int16_t) PA_CLAMP_UNLIKELY(lrintf(*src
* (1 << 15)), -0x8000, 0x7FFF);
61 static void pa_sconv_s16le_to_f32ne_neon(unsigned n
, const int16_t *src
, float *dst
) {
64 __asm__
__volatile__ (
65 "movs %[n], %[n], lsr #2 \n\t"
69 "vld1.16 {d0}, [%[src]]! \n\t"
70 "vmovl.s16 q0, d0 \n\t" /* widen */
71 "vcvt.f32.s32 q0, q0, #15 \n\t" /* f32<-s32 and divide by (1<<15) */
72 "subs %[n], %[n], #1 \n\t"
73 "vst1.32 {q0}, [%[dst]]! \n\t"
78 : [dst
] "+r" (dst
), [src
] "+r" (src
), [n
] "+r" (n
) /* output operands (or input operands that get modified) */
79 : /* input operands */
80 : "memory", "cc", "q0" /* clobber list */
84 const float invscale
= 1.0f
/ (1 << 15);
86 *dst
++ = *src
++ * invscale
;
90 void pa_convert_func_init_neon(pa_cpu_arm_flag_t flags
) {
91 pa_log_info("Initialising ARM NEON optimized conversions.");
92 pa_set_convert_from_float32ne_function(PA_SAMPLE_S16LE
, (pa_convert_func_t
) pa_sconv_s16le_from_f32ne_neon
);
93 pa_set_convert_to_float32ne_function(PA_SAMPLE_S16LE
, (pa_convert_func_t
) pa_sconv_s16le_to_f32ne_neon
);