def numpy_array_to_gst_buffer(frames, chunk_size, num_samples, sample_rate):
from gst import Buffer
""" gstreamer buffer to numpy array conversion """
buf = Buffer(getbuffer(frames.astype("float32")))
# Set its timestamp and duration
buf.timestamp = gst.util_uint64_scale(num_samples, gst.SECOND, sample_rate)
buf.duration = gst.util_uint64_scale(chunk_size, gst.SECOND, sample_rate)
return buf
