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Accept clock estimation with a single point

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If there is only one point, assume the slope is 1.

PR #3757 <https://github.com/Genymobile/scrcpy/pull/3757>
This commit is contained in:
Romain Vimont 2023-03-02 22:13:48 +01:00
parent 48a537d45c
commit 9b3ca208bf
2 changed files with 15 additions and 12 deletions
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17
app/src/clock.c
View file

@ -18,7 +18,15 @@ sc_clock_init(struct sc_clock *clock) {
static void
sc_clock_estimate(struct sc_clock *clock,
double *out_slope, sc_tick *out_offset) {
assert(clock->count > 1); // two points are necessary
assert(clock->count);
if (clock->count == 1) {
// If there is only 1 point, we can't compute a slope. Assume it is 1.
struct sc_clock_point *single_point = &clock->right_sum;
*out_slope = 1;
*out_offset = single_point->system - single_point->stream;
return;
}
struct sc_clock_point left_avg = {
.system = clock->left_sum.system / (clock->count / 2),
@ -93,19 +101,16 @@ sc_clock_update(struct sc_clock *clock, sc_tick system, sc_tick stream) {
clock->head = (clock->head + 1) % SC_CLOCK_RANGE;
if (clock->count > 1) {
// Update estimation
sc_clock_estimate(clock, &clock->slope, &clock->offset);
#ifndef SC_CLOCK_NDEBUG
LOGD("Clock estimation: %f * pts + %" PRItick,
clock->slope, clock->offset);
LOGD("Clock estimation: %f * pts + %" PRItick, clock->slope, clock->offset);
#endif
}
}
sc_tick
sc_clock_to_system_time(struct sc_clock *clock, sc_tick stream) {
assert(clock->count > 1); // sc_clock_update() must have been called
assert(clock->count); // sc_clock_update() must have been called
return (sc_tick) (stream * clock->slope) + clock->offset;
}

6
app/src/delay_buffer.c
View file

@ -196,10 +196,8 @@ sc_delay_buffer_frame_sink_push(struct sc_frame_sink *sink,
if (db->clock.count == 1) {
sc_mutex_unlock(&db->mutex);
// First frame, push it immediately, for two reasons:
// - not to delay the opening of the scrcpy window
// - the buffering estimation needs at least two clock points, so it
// could not handle the first frame
// First frame, push it immediately, not to delay the opening of the
// scrcpy window
return sc_frame_source_sinks_push(&db->frame_source, frame);
}