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demux: only query stream size at most once per second 

Instead of every packet. Doing it every packet led to the performance
regression mentioned in the fstat() commit. This should now be over, but
out of being careful, don't query the file size that often. This is only
used for user interface things, so this should not cause any problems.

For the sake of leaving the code compact, abuse another thing that is
updated only every second (speed statistics).
This commit is contained in:
wm4 2020-02-16 23:49:42 +01:00
parent 27bf978e75
commit 1a54339705
1 changed files with 9 additions and 5 deletions
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10
demux/demux.c
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@ -4027,11 +4027,16 @@ static void update_cache(struct demux_internal *in)
struct mp_tags *stream_metadata = NULL;
int64_t now = mp_time_us();
int64_t diff = now - in->last_speed_query;
bool do_update = diff >= MP_SECOND_US;
// Don't lock while querying the stream.
pthread_mutex_unlock(&in->lock);
int64_t stream_size = -1;
if (stream) {
if (do_update)
stream_size = stream_get_size(stream);
stream_control(stream, STREAM_CTRL_GET_METADATA, &stream_metadata);
}
@ -4040,6 +4045,7 @@ static void update_cache(struct demux_internal *in)
pthread_mutex_lock(&in->lock);
if (do_update)
in->stream_size = stream_size;
if (stream_metadata) {
add_timed_metadata(in, stream_metadata, NULL, MP_NOPTS_VALUE);
@ -4048,9 +4054,7 @@ static void update_cache(struct demux_internal *in)
in->next_cache_update = INT64_MAX;
int64_t now = mp_time_us();
int64_t diff = now - in->last_speed_query;
if (diff >= MP_SECOND_US) {
if (do_update) {
uint64_t bytes = in->cache_unbuffered_read_bytes;
in->cache_unbuffered_read_bytes = 0;
in->last_speed_query = now;