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context: improve graph rate selection

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If a node suggests a graph rate that is not in the list of allowed
rates, find the closest matching rate in the allowed rate instead of
just using the default.

When playing a file with a rate of 352800 and allowed rates of 44100,
48000, 96000 (default rate 48000) this will switch the graph to 96000
instead of the default 48000, which requires less resampling.
This commit is contained in:
Wim Taymans 2022-11-07 17:55:31 +01:00
parent 02a4758043
commit 34db6b80c6
1 changed files with 10 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

19
src/pipewire/context.c
View file

@ -968,13 +968,15 @@ static int fraction_compare(const struct spa_fraction *a, const struct spa_fract
return fa < fb ? -1 : (fa > fb ? 1 : 0);
}
static bool rates_contains(uint32_t *rates, uint32_t n_rates, uint32_t rate)
static uint32_t find_best_rate(uint32_t *rates, uint32_t n_rates, uint32_t rate, uint32_t best)
{
uint32_t i;
for (i = 0; i < n_rates; i++)
if (rates[i] == rate)
return true;
return false;
for (i = 0; i < n_rates; i++) {
if (SPA_ABS((int32_t)rate - (int32_t)rates[i]) <
SPA_ABS((int32_t)rate - (int32_t)best))
best = rates[i];
}
return best;
}
/* here we evaluate the complete state of the graph.
@ -1187,10 +1189,9 @@ again:
* Start with the default rate. If the desired rate is
* allowed, switch to it */
target_rate = def_rate;
if (rate.denom != 0 && rate.num == 1) {
if (rates_contains(rates, n_rates, rate.denom))
target_rate = rate.denom;
}
if (rate.denom != 0 && rate.num == 1)
target_rate = find_best_rate(rates, n_rates,
rate.denom, target_rate);
}
if (target_rate != current_rate) {