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alsa: improve target bandwidth calculation

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Also use the average error to calculate the bandwidth. If we are not
around 0, we should increase the bandwidth.
This commit is contained in:
Wim Taymans 2024-12-03 12:10:04 +01:00
parent 922efaf6ed
commit 22f0b858b1
1 changed files with 7 additions and 3 deletions
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10
spa/plugins/alsa/alsa-pcm.c
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@ -2831,16 +2831,20 @@ static int update_time(struct state *state, uint64_t current_time, snd_pcm_sfram
state->next_time += (uint64_t)(diff / corr * 1e9 / state->rate);
if (SPA_UNLIKELY((state->next_time - state->base_time) > BW_PERIOD)) {
double bw;
state->base_time = state->next_time;
spa_log_debug(state->log, "%s: follower:%d match:%d rate:%f "
bw = (fabs(state->err_avg) + sqrt(fabs(state->err_var)))/1000.0;
spa_log_info(state->log, "%s: follower:%d match:%d rate:%f "
"bw:%f thr:%u del:%ld target:%ld err:%f max:%f var:%f:%f:%f",
state->name, follower, state->matching,
corr, state->dll.bw, state->threshold, delay, target,
err, state->max_error, state->err_avg, state->err_var, state->err_wdw);
err, state->max_error, state->err_avg, state->err_var, bw);
spa_dll_set_bw(&state->dll,
SPA_CLAMPD(sqrt(state->err_var)/1000.0, 0.001, SPA_DLL_BW_MAX),
SPA_CLAMPD(bw, 0.001, SPA_DLL_BW_MAX),
state->threshold, state->rate);
}