mirrors/pipewire
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/pipewire/pipewire.git synced 2025-11-02 09:01:50 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions

audiocovert: improve dither setup

Browse source 
The quantize is the amount of bits we want to keep from the original
signal, subtract the amount of bits for noise. Clamp this to 0 (all
noise).
Calculate the scale factor better with powf() and avoid overflows.

Fixes #2479
This commit is contained in:
Wim Taymans 2022-06-28 10:11:46 +02:00
parent 67c2202044
commit b7e26002be
3 changed files with 9 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

7
spa/plugins/audioconvert/audioconvert.c
View file

@ -1395,9 +1395,10 @@ static int setup_out_convert(struct impl *this)
spa_log_debug(this->log, "%p: got converter features %08x:%08x passthrough:%d", this,
this->cpu_flags, out->conv.cpu_flags, out->conv.is_passthrough);
if (this->props.dither_noise > 0) {
this->dither.quantize = 32 - (calc_width(&dst_info) * 8);
this->dither.quantize += this->props.dither_noise;
this->dither.quantize = calc_width(&dst_info) * 8;
this->dither.quantize -= SPA_MIN(this->dither.quantize, this->props.dither_noise);
this->dither.n_channels = dst_info.info.raw.channels;
this->dither.cpu_flags = this->cpu_flags;
@ -2478,7 +2479,7 @@ static int impl_node_process(void *object)
}
this->out_offset += n_samples;
if (this->props.dither_noise > 0) {
if (this->dither.process != NULL) {
in_datas = (const void**)out_datas;
if (out_passthrough)
out_datas = dst_datas;

5
spa/plugins/audioconvert/dither-ops.c
View file

@ -79,10 +79,7 @@ int dither_init(struct dither *d)
if (info == NULL)
return -ENOTSUP;
if (d->quantize >= 32)
return -EINVAL;
d->scale = 1.0f / (1ULL << (63 - d->quantize));
d->scale = 1.0f / powf(2.0f, 31 + d->quantize);
d->dither_size = DITHER_SIZE;
d->dither = calloc(d->dither_size + DITHER_OPS_MAX_OVERREAD +

8
spa/plugins/audioconvert/dither-ops.h
View file

@ -34,10 +34,10 @@
struct dither {
uint32_t quantize;
#define DITHER_METHOD_NONE 0
#define DITHER_METHOD_RECTANGULAR 2
#define DITHER_METHOD_TRIANGULAR 3
#define DITHER_METHOD_SHAPED_5 4
#define DITHER_METHOD_NONE 0
#define DITHER_METHOD_RECTANGULAR 2
#define DITHER_METHOD_TRIANGULAR 3
#define DITHER_METHOD_SHAPED_5 4
uint32_t method;
uint32_t n_channels;
uint32_t cpu_flags;