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sink-input: extend comments on rewinding logic a bit

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This commit is contained in:
Lennart Poettering 2009-08-27 00:07:15 +02:00
parent c372b52a77
commit 5df842db64
2 changed files with 16 additions and 8 deletions
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22
src/pulsecore/sink-input.c
View file

@ -1472,7 +1472,13 @@ pa_bool_t pa_sink_input_safe_to_remove(pa_sink_input *i) {
}
/* Called from IO context */
void pa_sink_input_request_rewind(pa_sink_input *i, size_t nbytes /* in our sample spec */, pa_bool_t rewrite, pa_bool_t flush, pa_bool_t dont_rewind_render) {
void pa_sink_input_request_rewind(
pa_sink_input *i,
size_t nbytes /* in our sample spec */,
pa_bool_t rewrite,
pa_bool_t flush,
pa_bool_t dont_rewind_render) {
size_t lbq;
/* If 'rewrite' is TRUE the sink is rewound as far as requested
@ -1487,19 +1493,20 @@ void pa_sink_input_request_rewind(pa_sink_input *i, size_t nbytes /* in our sam
* dont_rewind_render is TRUE then the render memblockq is not
* rewound. */
/* nbytes = 0 means maximum rewind request */
pa_sink_input_assert_ref(i);
pa_sink_input_assert_io_context(i);
nbytes = PA_MAX(i->thread_info.rewrite_nbytes, nbytes);
/* pa_log_debug("request rewrite %lu", (unsigned long) nbytes); */
pa_assert(rewrite || flush);
pa_assert(!dont_rewind_render || !rewrite);
/* We don't take rewind requests while we are corked */
if (i->thread_info.state == PA_SINK_INPUT_CORKED)
return;
pa_assert(rewrite || flush);
pa_assert(!dont_rewind_render || !rewrite);
nbytes = PA_MAX(i->thread_info.rewrite_nbytes, nbytes);
/* pa_log_debug("request rewrite %zu", nbytes); */
/* Calculate how much we can rewind locally without having to
* touch the sink */
@ -1519,6 +1526,7 @@ void pa_sink_input_request_rewind(pa_sink_input *i, size_t nbytes /* in our sam
nbytes = pa_resampler_request(i->thread_info.resampler, nbytes);
}
/* Remember how much we actually want to rewrite */
if (i->thread_info.rewrite_nbytes != (size_t) -1) {
if (rewrite) {
/* Make sure to not overwrite over underruns */

2
src/pulsecore/sink-input.h
View file

@ -212,7 +212,7 @@ struct pa_sink_input {
pa_bool_t attached:1; /* True only between ->attach() and ->detach() calls */
/* 0: rewrite nothing, (size_t) -1: rewrite everything, otherwise how many bytes to rewrite */
/* rewrite_nbytes: 0: rewrite nothing, (size_t) -1: rewrite everything, otherwise how many bytes to rewrite */
pa_bool_t rewrite_flush:1, dont_rewind_render:1;
size_t rewrite_nbytes;
uint64_t underrun_for, playing_for;