def _audio_flinger_handler(self, buffer_size_frames=None):
"""
Parses audio callback routines.
"""
all_tasks = self._trace.cpu.task_intervals()
self._OSL_cbks = IntervalList(filter_by_task(all_tasks, 'name', 'OSLcbk', 'any'))
self._fRdy2s = self._trace.android.event_intervals(name='fRdy2')
# Lets estimate buffer size (in seconds)
# By taking geomean of intervals between OSL callbacks
cbk_delta = [cbk_b.interval.start - cbk_a.interval.start \
for cbk_a, cbk_b in zip(self._OSL_cbks, self._OSL_cbks[1:])]
self.buffer_size_seconds = round(percentile(cbk_delta, 0.9), 3)
# Find audio jitter intervals
# This is delta (in seconds) between expected OSL callback arrival time
# and actual arrival time. We want this interval reasonably small.
self._cbk_jitters = IntervalList()
for cbk_a, cbk_b in zip(self._OSL_cbks, self._OSL_cbks[1:]):
expected_cbk_arrival_time = \
cbk_a.interval.start + self.buffer_size_seconds
delta = cbk_b.interval.start - expected_cbk_arrival_time
interval = Interval(cbk_a.interval.start, cbk_b.interval.start)
self._cbk_jitters.append(AudioJitter(interval=interval, latency=delta))
if self.buffer_size_frames is None:
# Estimate buffer sizes (frames)
self.buffer_size_frames = int(percentile([frdy.value for frdy in self._fRdy2s if frdy.value >= 0], 0.9))
else:
self.buffer_size_frames = buffer_size_frames
def _input_intervals():
"""
Generator that yields intervals when discrete input event(s)
are read & decoded by Android `Input Reader`.
x__x__x____IR___ID_ID_ID___DI_SU__DI_SU__DI_SU______
x = multiple input IRQs (multi-touch translated by Android Input Framework)
IR = Input Reader [read/decodes multiple events @ once]
ID = Input Dispatch [dispatches each input event]
DI = Deliver Input [ appropriate window consumes input event ]
SU = SurfaceFlinger Screen Update due to window handling input event
Please note InputReader 'iq' will be set to 1 whenever InputReader
had event to process. This could be disabled in some systems.
"""
last_timestamp = self._trace.interval.start
for ir_event in filter_by_task(all_tasks, 'name', 'InputReader',
'any'):
yield Interval(last_timestamp, ir_event.interval.end)
last_timestamp = ir_event.interval.end
def _input_latency_handler(self, irq_name):
"""
Returns list of all input events
"""
self._input_latencies = IntervalList()
all_tasks = self._trace.cpu.task_intervals()
all_aq_events = self.input_events()
touch_irqs = IntervalList(
filter_by_task(all_tasks, 'name', irq_name, 'any'))
def _input_intervals():
"""
Generator that yields intervals when discrete input event(s)
are read & decoded by Android `Input Reader`.
x__x__x____IR___ID_ID_ID___DI_SU__DI_SU__DI_SU______
x = multiple input IRQs (multi-touch translated by Android Input Framework)
IR = Input Reader [read/decodes multiple events @ once]
ID = Input Dispatch [dispatches each input event]
DI = Deliver Input [ appropriate window consumes input event ]
SU = SurfaceFlinger Screen Update due to window handling input event
Please note InputReader 'iq' will be set to 1 whenever InputReader
had event to process. This could be disabled in some systems.
"""
last_timestamp = self._trace.interval.start
for ir_event in filter_by_task(all_tasks, 'name', 'InputReader',
'any'):
yield Interval(last_timestamp, ir_event.interval.end)
last_timestamp = ir_event.interval.end
for interval in _input_intervals():
irqs = touch_irqs.slice(interval=interval, trimmed=False)
# Necessary as we may be interested in different IRQ name
if irqs:
# Use longest IRQ
start_ts = max(
irqs, key=lambda x: x.interval.duration).interval.start
end_ts = start_ts
post_ir_interval = Interval(start_ts, self._trace.duration)
di_events = self.event_intervals(
name=['deliverInputEvent', 'input'],
interval=post_ir_interval)
if di_events:
# IMPORTANT: If InputDispatcher sythesizes multiple
# events to same application, we ignore consequent event
# and only parse 1st event. This is because we heuristically
# can't determine start of next input event to differentiate.
di_event = di_events[0]
# necessary in case a synthetic events is cancelled
# canceled appropriately when the events are no longer
# being resynthesized (because the application or IME is
# already handling them or dropping them entirely)
# This is done by checking for dumping input latencies when
# active input event queue length (aq) is > 1 for same task.
# For more details, see
# https://android.googlesource.com/platform/frameworks/base.git/+
# /f9e989d5f09e72f5c9a59d713521f37d3fdd93dd%5E!/
# This returns first interval when aq has pending event(s)
di_event_name = getattr(di_event, 'name', None)
if di_event_name and di_event_name == 'input':
pfb_events = self.event_intervals(
name='doComposition', interval=post_ir_interval)
else:
aq_event = filter_by_task(
all_aq_events.slice(interval=post_ir_interval),
'pid', di_event.event.task.pid)
if aq_event and aq_event.value > 0:
post_di_start = aq_event.interval.start
else:
if aq_event:
continue # if AQ event exists.
post_di_start = di_events[0].interval.start
post_di_interval = Interval(post_di_start,
self._trace.duration)
pfb_events = self.event_intervals(
name='doComposition', interval=post_di_interval)
if pfb_events:
end_ts = pfb_events[0].interval.end
if start_ts != end_ts and end_ts > start_ts and start_ts not in self._input_latencies._start_timestamps:
input_interval = Interval(start=start_ts, end=end_ts)
self._input_latencies.append(
InputLatency(interval=input_interval,
latency=input_interval.duration))
return self._input_latencies
