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sink, source: Make rate selection more explicit

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This serves to explicitly document the various cases we deal with in
pa_sink_update_rate()/pa_source_update_rate() rather than have some of
them hidden behind the initialisation of desired_rate.
This commit is contained in:
Arun Raghavan 2017-01-30 14:07:37 +05:30
parent cc021c7330
commit 539371b3f7
2 changed files with 34 additions and 16 deletions
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25
src/pulsecore/source.c
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@ -977,7 +977,7 @@ void pa_source_post_direct(pa_source*s, pa_source_output *o, const pa_memchunk *
/* Called from main thread */
int pa_source_update_rate(pa_source *s, uint32_t rate, bool passthrough) {
int ret;
uint32_t desired_rate = rate;
uint32_t desired_rate;
uint32_t default_rate = s->default_sample_rate;
uint32_t alternate_rate = s->alternate_sample_rate;
bool default_rate_is_usable = false;
@ -1008,21 +1008,30 @@ int pa_source_update_rate(pa_source *s, uint32_t rate, bool passthrough) {
}
}
if (PA_UNLIKELY(!pa_sample_rate_valid(desired_rate)))
if (PA_UNLIKELY(!pa_sample_rate_valid(rate)))
return -1;
if (avoid_resampling && (rate >= default_rate || rate >= alternate_rate)) {
if (passthrough) {
/* We have to try to use the source output rate */
desired_rate = rate;
} else if (avoid_resampling && (rate >= default_rate || rate >= alternate_rate)) {
/* We just try to set the source output's sample rate if it's not too low */
desired_rate = rate;
} else if (!passthrough && default_rate != desired_rate && alternate_rate != desired_rate) {
if (default_rate % 11025 == 0 && desired_rate % 11025 == 0)
} else if (default_rate == rate || alternate_rate == rate) {
/* We can directly try to use this rate */
desired_rate = rate;
} else {
/* See if we can pick a rate that results in less resampling effort */
if (default_rate % 11025 == 0 && rate % 11025 == 0)
default_rate_is_usable = true;
if (default_rate % 4000 == 0 && desired_rate % 4000 == 0)
if (default_rate % 4000 == 0 && rate % 4000 == 0)
default_rate_is_usable = true;
if (alternate_rate && alternate_rate % 11025 == 0 && desired_rate % 11025 == 0)
if (alternate_rate && alternate_rate % 11025 == 0 && rate % 11025 == 0)
alternate_rate_is_usable = true;
if (alternate_rate && alternate_rate % 4000 == 0 && desired_rate % 4000 == 0)
if (alternate_rate && alternate_rate % 4000 == 0 && rate % 4000 == 0)
alternate_rate_is_usable = true;
if (alternate_rate_is_usable && !default_rate_is_usable)