base: reorganize td_buffer stuff a bit
base: reorganize td_buffer stuff a bit

Makes more sense this way.

No functional changes.

Signed-off-by: Felipe Contreras <de77a8b9cd239b204c19c52ed62e48ab47243362@nokia.com>

community-ssu/gst-dsp,community-ssu/gst-dsp,community-ssu/gst-dsp,felipec/gst-dsp,felipec/gst-dsp