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audioconvert: Always apply noise when asked

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Rename empty.noise -> dither.noise and always add this amount of noise
when > 0. This also adds the noise to silent sounds, not only when
nothing is connected because that would also be a problem when an amp
needs to be kept alive with an non-0 signal.

Rename noise -> dither because we can use this also for dithering later.

See #705
This commit is contained in:
Wim Taymans 2022-06-27 11:19:01 +02:00
parent abcf7cb8d8
commit 9f55708e9d
9 changed files with 107 additions and 68 deletions
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83
spa/plugins/audioconvert/noise-ops.c
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@ -1,83 +0,0 @@
/* Spa
*
* Copyright © 2022 Wim Taymans
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <string.h>
#include <stdio.h>
#include <stdint.h>
#include <math.h>
#include <spa/param/audio/format-utils.h>
#include <spa/support/cpu.h>
#include <spa/support/log.h>
#include <spa/utils/defs.h>
#include "noise-ops.h"
typedef void (*noise_func_t) (struct noise *ns, void * SPA_RESTRICT dst[], uint32_t n_samples);
static const struct noise_info {
noise_func_t process;
uint32_t cpu_flags;
} noise_table[] =
{
{ noise_f32_c, 0 },
};
#define MATCH_CPU_FLAGS(a,b) ((a) == 0 || ((a) & (b)) == a)
static const struct noise_info *find_noise_info(uint32_t cpu_flags)
{
size_t i;
for (i = 0; i < SPA_N_ELEMENTS(noise_table); i++) {
if (!MATCH_CPU_FLAGS(noise_table[i].cpu_flags, cpu_flags))
continue;
return &noise_table[i];
}
return NULL;
}
static void impl_noise_free(struct noise *ns)
{
ns->process = NULL;
}
int noise_init(struct noise *ns)
{
const struct noise_info *info;
size_t i;
info = find_noise_info(ns->cpu_flags);
if (info == NULL)
return -ENOTSUP;
if (ns->intensity >= 64)
return -EINVAL;
for (i = 0; i < SPA_N_ELEMENTS(ns->tab); i++)
ns->tab[i] = (drand48() - 0.5) / (UINT64_C(1) << ns->intensity);
ns->free = impl_noise_free;
ns->process = info->process;
return 0;
}