Skip to content

Adds end-to-end audio latency test to pywalt scripts #110

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
jkammerl wants to merge 2 commits into
base: master
Choose a base branch
from
Open

Adds end-to-end audio latency test to pywalt scripts #110

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
9f81f60
Adds end-to-end audio latency test to walt.py
jkammerl Aug 27, 2017
16fc467
Merge branch 'master' of https://github.com/google/walt
jkammerl Aug 27, 2017
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
37 changes: 36 additions & 1 deletion pywalt/pywalt/walt.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -92,6 +92,8 @@ class Walt(object):
CMD_VERSION = 'V'
CMD_SAMPLE_ALL = 'Q'
CMD_BRIGHTNESS_CURVE = 'U'
CMD_BEEP = 'B'
CMD_STOP_BEEP = 'S'
CMD_AUDIO = 'A'


Expand Down Expand Up @@ -300,7 +302,7 @@ def parse_args(argv):
help='WALT serial port')
parser.add_argument('-t', '--type',
help='Test type: drag|tap|screen|sanity|curve|bridge|'
'tapaudio|tapblink')
'tapaudio|tapblink|e2e_audio')
parser.add_argument('-l', '--logdir', default=temp_dir,
help='where to store logs')
parser.add_argument('-n', default=40, type=int,
Expand Down Expand Up @@ -596,6 +598,37 @@ def run_walt_sanity_test(args):
print(s.strip() + '\tmin-max: ' + minmax)
time.sleep(0.1)

def run_audio_e2e_latency(args):
print('Starting end-to-end audio latency test')
with Walt(args.serial) as walt:
walt.sndrcv(Walt.CMD_RESET)
tstart = time.time()
t_zero = walt.zero_clock()
if t_zero < 0:
print('Error: Couldn\'t zero clock, exitting')
sys.exit(1)

# Sleep to ensure no previous beeps interfere the measurement
walt.sndrcv(Walt.CMD_STOP_BEEP)
time.sleep(1)

# Trigger beep & execute latency test
walt.sndrcv(Walt.CMD_BEEP)
walt.sndrcv(Walt.CMD_AUDIO)

print('waiting for response')
# The following line blocks until a message from WALT arrives
trigger_line = walt.readline()
walt.sndrcv(Walt.CMD_STOP_BEEP)

parts = trigger_line.strip().split()
if len(parts) != 5:
raise Exception('Malformed trigger line: "%s"\n' % trigger_line)
# Convert microseconds to milliseconds
latency_ms = float(parts[2]) * 0.001

print('Measured end-to-end latency: %f ms' % latency_ms)


class TcpServer:
"""
Expand Down Expand Up @@ -772,6 +805,8 @@ def main(argv=sys.argv[1:]):
run_screen_curve(args)
elif args.type == 'bridge':
run_tcp_bridge(args)
elif args.type == 'e2e_audio':
run_audio_e2e_latency(args)
elif args.type == 'tapaudio':
run_tap_audio_test(args)
elif args.type == 'tapblink':
Expand Down