mirror of
https://gitlab.freedesktop.org/pipewire/pipewire.git
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80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
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/* Spa
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*
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* Copyright © 2022 Wim Taymans
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include <string.h>
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#include <stdio.h>
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#include <math.h>
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#include <spa/param/audio/format-utils.h>
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#include <spa/support/cpu.h>
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#include <spa/support/log.h>
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#include <spa/utils/defs.h>
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#include "noise-ops.h"
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typedef void (*noise_func_t) (struct noise *ns, void * SPA_RESTRICT dst[], uint32_t n_samples);
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static const struct noise_info {
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noise_func_t process;
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uint32_t cpu_flags;
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} noise_table[] =
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{
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{ noise_f32_c, 0 },
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};
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#define MATCH_CPU_FLAGS(a,b) ((a) == 0 || ((a) & (b)) == a)
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static const struct noise_info *find_noise_info(uint32_t cpu_flags)
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{
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size_t i;
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for (i = 0; i < SPA_N_ELEMENTS(noise_table); i++) {
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if (!MATCH_CPU_FLAGS(noise_table[i].cpu_flags, cpu_flags))
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continue;
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return &noise_table[i];
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}
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return NULL;
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}
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static void impl_noise_free(struct noise *ns)
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{
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ns->process = NULL;
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}
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int noise_init(struct noise *ns)
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{
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const struct noise_info *info;
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int i;
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info = find_noise_info(ns->cpu_flags);
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if (info == NULL)
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return -ENOTSUP;
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for (i = 0; i < NOISE_SIZE; i++)
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ns->tab[i] = (drand48() - 0.5) / (1 << ns->intensity);
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ns->free = impl_noise_free;
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ns->process = info->process;
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return 0;
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}
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