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"
39 "vdup.f32 q1, %[scale] \n\t"
42 "vld1.32 {q0}, [%[src]]! \n\t"
43 "vmul.f32 q0, q0, q1 \n\t" /* scale */
44 "vcvt.s32.f32 q0, q0, #16 \n\t" /* s32<-f32 as 16:16 fixed-point */
45 "vqrshrn.s32 d0, q0, #16 \n\t" /* shift, round, narrow */
46 "subs %[n], %[n], #1 \n\t"
47 "vst1.16 {d0}, [%[dst]]! \n\t"
52 : [dst
] "+r" (dst
), [src
] "+r" (src
), [n
] "+r" (n
) /* output operands (or input operands that get modified) */
53 : [scale
] "r" (32768.0f
) /* input operands */
54 : "memory", "cc", "q0", "q1" /* clobber list */
59 *dst
++ = (int16_t) PA_CLAMP_UNLIKELY(lrintf(*src
* (1 << 15)), -0x8000, 0x7FFF);
64 static void pa_sconv_s16le_to_f32ne_neon(unsigned n
, const int16_t *src
, float *dst
) {
67 const float invscale
= 1.0f
/ (1 << 15);
69 __asm__
__volatile__ (
70 "movs %[n], %[n], lsr #2 \n\t"
73 "vdup.f32 q1, %[invscale] \n\t"
76 "vld1.16 {d0}, [%[src]]! \n\t"
77 "vmovl.s16 q0, d0 \n\t" /* widen */
78 "vcvt.f32.s32 q0, q0 \n\t" /* f32<-s32 */
79 "vmul.f32 q0, q0, q1 \n\t"
80 "subs %[n], %[n], #1 \n\t"
81 "vst1.32 {q0}, [%[dst]]! \n\t"
86 : [dst
] "+r" (dst
), [src
] "+r" (src
), [n
] "+r" (n
) /* output operands (or input operands that get modified) */
87 : [invscale
] "r" (invscale
) /* input operands */
88 : "memory", "cc", "q0", "q1" /* clobber list */
93 *dst
++ = *src
++ * invscale
;
97 void pa_convert_func_init_neon(pa_cpu_arm_flag_t flags
) {
98 pa_log_info("Initialising ARM NEON optimized conversions.");
99 pa_set_convert_from_float32ne_function(PA_SAMPLE_S16LE
, (pa_convert_func_t
) pa_sconv_s16le_from_f32ne_neon
);
100 pa_set_convert_to_float32ne_function(PA_SAMPLE_S16LE
, (pa_convert_func_t
) pa_sconv_s16le_to_f32ne_neon
);