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delay: improve delay performance

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Use a wrap around delay ringbuffer. We can then avoid some modulo
arithmetic and read more efficiently.

Also handle the delay convolver case better by reversing the taps and
reading the taps and delay buffer without extra overhead.
This commit is contained in:
Wim Taymans 2024-10-15 12:14:57 +02:00
parent 668055e612
commit a57f2f25b6
4 changed files with 31 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

10
spa/plugins/audioconvert/channelmix-ops.c
View file

@ -775,16 +775,20 @@ int channelmix_init(struct channelmix *mix)
mix->delay = (uint32_t)(mix->rear_delay * mix->freq / 1000.0f);
mix->func_name = info->name;
spa_log_debug(mix->log, "selected %s delay:%d options:%08x", info->name, mix->delay,
mix->options);
if (mix->hilbert_taps > 0) {
mix->n_taps = SPA_CLAMP(mix->hilbert_taps, 15u, 255u) | 1;
blackman_window(mix->taps, mix->n_taps);
hilbert_generate(mix->taps, mix->n_taps);
reverse_taps(mix->taps, mix->n_taps);
} else {
mix->n_taps = 1;
mix->taps[0] = 1.0f;
}
if (mix->delay + mix->n_taps > BUFFER_SIZE)
mix->delay = BUFFER_SIZE - mix->n_taps;
spa_log_debug(mix->log, "selected %s delay:%d options:%08x", info->name, mix->delay,
mix->options);
return make_matrix(mix);
}