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example: Use do_fill in AudioTestSrc instead of do_create

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With the new mapping API we can efficiently use the ->fill vmethod
which is sensibly better.
This commit is contained in:
Thibault Saunier 2019-12-11 08:14:16 -03:00
parent d365954fc0
commit 986d6d12fb
1 changed files with 14 additions and 11 deletions
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25
examples/plugins/python/py_audiotestsrc.py
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@ -148,7 +148,7 @@ class AudioTestSrc(GstBase.BaseSrc):
return start, end
def do_create(self, offset, length):
def do_fill(self, offset, length, buf):
if length == -1:
samples = SAMPLESPERBUFFER
else:
@ -162,16 +162,19 @@ class AudioTestSrc(GstBase.BaseSrc):
next_byte = self.next_byte + bytes_
next_time = Gst.util_uint64_scale_int(next_sample, Gst.SECOND, self.info.rate)
if not self.mute:
r = np.repeat(
np.arange(self.accumulator, self.accumulator + samples),
self.info.channels)
data = ((np.sin(2 * np.pi * r * self.freq / self.info.rate) * self.volume)
.astype(np.float32))
else:
data = [0] * bytes_
buf = Gst.Buffer.new_wrapped(bytes(data))
try:
with buf.map(Gst.MapFlags.WRITE) as info:
array = np.ndarray(shape = self.info.channels * samples, dtype = np.float32, buffer = info.data)
if not self.mute:
r = np.repeat(np.arange(self.accumulator, self.accumulator + samples),
self.info.channels)
np.sin(2 * np.pi * r * self.freq / self.info.rate, out=array)
array *= self.volume
else:
array[:] = 0
except Exception as e:
Gst.error("Mapping error: %s" % e)
return Gst.FlowReturn.ERROR
buf.offset = self.next_sample
buf.offset_end = next_sample