This adds the exact bits per sample for DFPWM to 
av_get_exact_bits_per_sample.
Previously, the DTS and PTS were set to 0 because the codec never 
reported them, but adding this allows libavformat to automatically
set DTS and PTS from the byte position of the stream.

Signed-off-by: Jack Bruienne <jackbruienne@gmail.com>
---
  libavcodec/utils.c | 2 ++
  1 file changed, 2 insertions(+)