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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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42
spa/plugins/audioconvert/dither-ops-c.c Normal file
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@ -0,0 +1,42 @@
/* 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 "dither-ops.h"
void dither_f32_c(struct dither *dt, void * SPA_RESTRICT dst[],
const void * SPA_RESTRICT src[], uint32_t n_samples)
{
uint32_t i, n;
const float **s = (const float**)src;
float **d = (float**)dst;
const float *t = dt->tab;
int tab_idx = dt->tab_idx;
for (i = 0; i < dt->n_channels; i++) {
for (n = 0; n < n_samples; n++)
d[i][n] = s[i][n] + t[tab_idx++ & DITHER_MOD];
tab_idx += 61;
}
dt->tab_idx = tab_idx & DITHER_MOD;
}