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d/psvr: Ensure that timestamps are always after each other

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This commit is contained in:
Jakob Bornecrantz 2021-03-14 16:51:05 +00:00
parent a9a706cbbd
commit c73146c6fd
2 changed files with 36 additions and 17 deletions
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2
doc/changes/drivers/mr.717.md Normal file
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@ -0,0 +1,2 @@
psvr: Ensure that timestamps are always after each other, stopping any
time-traveling sample packets.

51
src/xrt/drivers/psvr/psvr_device.c
View file

@ -1,5 +1,5 @@
// Copyright 2016, Joey Ferwerda.
// Copyright 2019-2020, Collabora, Ltd.
// Copyright 2019-2021, Collabora, Ltd.
// SPDX-License-Identifier: BSL-1.0
/*!
* @file
@ -296,10 +296,7 @@ read_sample_and_apply_calibration(struct psvr_device *psvr,
}
static void
update_fusion(struct psvr_device *psvr,
struct psvr_parsed_sample *sample,
uint32_t tick_delta,
timepoint_ns timestamp_ns)
update_fusion(struct psvr_device *psvr, struct psvr_parsed_sample *sample, uint64_t timestamp_ns)
{
struct xrt_vec3 mag = {0.0f, 0.0f, 0.0f};
(void)mag;
@ -313,14 +310,7 @@ update_fusion(struct psvr_device *psvr,
xrt_tracked_psvr_push_imu(psvr->tracker, timestamp_ns, &sample);
} else {
#if 1
timepoint_ns now = os_monotonic_get_ns();
m_imu_3dof_update(&psvr->fusion, now, &psvr->read.accel, &psvr->read.gyro);
#else
float delta_secs = tick_delta / PSVR_TICKS_PER_SECOND;
math_quat_integrate_velocity(&psvr->fusion.rot, &psvr->read.gyro, delta_secs, &psvr->fusion.rot);
#endif
m_imu_3dof_update(&psvr->fusion, timestamp_ns, &psvr->read.accel, &psvr->read.gyro);
}
}
@ -338,10 +328,27 @@ calc_delta_and_handle_rollover(uint32_t next, uint32_t last)
return tick_delta;
}
static timepoint_ns
ensure_forward_progress_timestamps(struct psvr_device *psvr, timepoint_ns timestamp_ns)
{
timepoint_ns t = timestamp_ns;
/*
* This make sure the timestamp is after the last we sent to the fusion,
* but it effectively drops the sample.
*/
if (psvr->last_sensor_time > t) {
t = psvr->last_sensor_time + 1;
}
psvr->last_sensor_time = t;
return t;
}
static void
handle_tracker_sensor_msg(struct psvr_device *psvr, unsigned char *buffer, int size)
{
timepoint_ns now = os_monotonic_get_ns();
timepoint_ns now_ns = os_monotonic_get_ns();
uint32_t last_sample_tick = psvr->last.samples[1].tick;
if (!psvr_parse_sensor_packet(&psvr->last, buffer, size)) {
@ -368,16 +375,26 @@ handle_tracker_sensor_msg(struct psvr_device *psvr, unsigned char *buffer, int s
tick_delta = 500;
}
}
// New delta between the two samples.
uint32_t tick_delta2 = calc_delta_and_handle_rollover(s->samples[1].tick, s->samples[0].tick);
time_duration_ns inter_sample_duration_ns = tick_delta2 * PSVR_NS_PER_TICK;
// Move it back in time.
timepoint_ns timestamp_ns = (uint64_t)now_ns - (uint64_t)inter_sample_duration_ns;
// Make sure timestamps are always after a previous timestamp.
timestamp_ns = ensure_forward_progress_timestamps(psvr, timestamp_ns);
// Update the fusion with first sample.
update_fusion(psvr, &s->samples[0], tick_delta, now - inter_sample_duration_ns);
update_fusion(psvr, &s->samples[0], timestamp_ns);
// Make sure timestamps are always after a previous timestamp.
timestamp_ns = ensure_forward_progress_timestamps(psvr, now_ns);
// Update the fusion with second sample.
update_fusion(psvr, &s->samples[1], tick_delta2, now);
psvr->last_sensor_time = now;
update_fusion(psvr, &s->samples[1], timestamp_ns);
}
static void