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channelmix: make up/downmix levels configurable

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Add channelmix.center-level, channelmix.surround-level and
channelmix.lfe-level to control how center, surround and LFE is
up/downmixed.

Fixes #5198
This commit is contained in:
Wim Taymans 2026-03-30 17:50:48 +02:00
parent 03f894bab0
commit 18c97222c4
12 changed files with 119 additions and 25 deletions
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21
spa/plugins/audioconvert/channelmix-ops.c
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@ -198,9 +198,9 @@ static int make_matrix(struct channelmix *mix)
uint32_t dst_chan = mix->dst_chan;
uint64_t unassigned, keep;
uint32_t i, j, ic, jc, matrix_encoding = MATRIX_NORMAL;
float clev = SQRT1_2;
float slev = SQRT1_2;
float llev = 0.5f;
float clev = mix->center_level;
float slev = mix->surround_level;
float llev = mix->lfe_level;
float maxsum = 0.0f;
bool filter_fc = false, filter_lfe = false, matched = false, normalize;
#define _MATRIX(s,d) matrix[_CH(s)][_CH(d)]
@ -874,6 +874,21 @@ static void impl_channelmix_free(struct channelmix *mix)
mix->process = NULL;
}
void channelmix_reset(struct channelmix *mix)
{
spa_zero(*mix);
mix->options = CHANNELMIX_DEFAULT_OPTIONS;
mix->upmix = CHANNELMIX_DEFAULT_UPMIX;
mix->lfe_cutoff = CHANNELMIX_DEFAULT_LFE_CUTOFF;
mix->fc_cutoff = CHANNELMIX_DEFAULT_FC_CUTOFF;
mix->rear_delay = CHANNELMIX_DEFAULT_REAR_DELAY;
mix->center_level = CHANNELMIX_DEFAULT_CENTER_LEVEL;
mix->surround_level = CHANNELMIX_DEFAULT_SURROUND_LEVEL;
mix->lfe_level = CHANNELMIX_DEFAULT_LFE_LEVEL;
mix->widen = CHANNELMIX_DEFAULT_WIDEN;
mix->hilbert_taps = CHANNELMIX_DEFAULT_HILBERT_TAPS;
}
int channelmix_init(struct channelmix *mix)
{
const struct channelmix_info *info;