def get_current_stream_formats(self):
playback = AvcStreamFormatInfo.get_format(self.fcp, 'input', 0)
if not self._playback_only:
capture = AvcStreamFormatInfo.get_format(self.fcp, 'output', 0)
else:
capture = None
return {'playback': playback, 'capture': capture}
def _parse_supported_stream_formats(self):
supported_stream_formats = {}
supported_stream_formats['playback'] = \
AvcStreamFormatInfo.get_formats(self.fcp, 'input', 0)
if len(supported_stream_formats['playback']) == 0:
supported_stream_formats['playback'] = \
self._assume_supported_stram_formats('input', 0)
self._assumed = True
else:
self._assumed = False
if not self._playback_only:
supported_stream_formats['capture'] = \
AvcStreamFormatInfo.get_formats(self.fcp, 'output', 0)
if len(supported_stream_formats['capture']) == 0:
supported_stream_formats['capture'] = \
self._assume_supported_stram_formats('output', 0)
return supported_stream_formats
def set_stream_formats(self, playback, capture):
if playback not in self.supported_stream_formats['playback']:
raise ValueError('Invalid argument for playback stream format')
if capture:
if self._playback_only:
raise ValueError('This unit is playback only')
if capture not in self.supported_stream_formats['capture']:
raise ValueError('Invalid argument for capture stream format')
if playback['sampling-rate'] != capture['sampling-rate']:
raise ValueError('Sampling rate mis-match between playback and capture')
if self._assumed:
rate = playback['sampling-rate']
AvcConnection.set_plug_signal_format(self.fcp, 'output', 0, rate)
AvcConnection.set_plug_signal_format(self.fcp, 'input', 0, rate)
else:
AvcStreamFormatInfo.set_format(self.fcp, 'input', 0, playback)
if not self._playback_only:
AvcStreamFormatInfo.set_format(self.fcp, 'output', 0, capture)
def _assume_supported_stram_formats(self, direction, plug):
assumed_stream_formats = []
fmt = AvcStreamFormatInfo.get_format(self.fcp, 'input', 0)
for rate, state in self.supported_sampling_rates.items():
if state:
assumed = {
'sampling-rate': rate,
'rate-control': fmt['rate-control'],
'formation': fmt['formation']}
assumed_stream_formats.append(assumed)
return assumed_stream_formats
