AVPacket argument rather than a const uint8_t *buf + int buf_size. This allows
passing of packet-specific flags from demuxer to decoder, such as the keyframe
flag, which appears necessary to playback corePNG P-frames.

Patch by Thilo Borgmann thilo.borgmann googlemail com, see also the thread
"Google Summer of Code participation" on the mailinglist.



git-svn-id: file:///var/local/repositories/ffmpeg/trunk@18351 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b