convert: Limit sc12 converter buffer overwrite

This patch addresses issue #648 "B200: TX with SC12 format and MIMO".

The observed MIMO header corruption was caused by overwriting the
end of the packed 12-bit sample output buffer. The overwrite was due to
the converter call always writing out 4 complex samples even if less
than 4 samples were available. The extra samples would corrupt data with
zero padding.

Avoid the overwrite condition by only writing the minimum number of
32-bit lines necessary rather than the entire 12 byte struct.

Samples        32-bit lines
  1                 1
  2                 2
  3                 3
  4                 3

Signed-off-by: Tom Tsou <tom@tsou.cc>

0 files changed, 0 insertions, 0 deletions