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.

Originally committed as revision 18351 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 13759 to svn://svn.ffmpeg.org/ffmpeg/trunk

patch by Stefano Sabatini, stefano.sabatini-lala poste it

Originally committed as revision 13005 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 12525 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 11717 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 9484 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 8675 to svn://svn.ffmpeg.org/ffmpeg/trunk

Originally committed as revision 8674 to svn://svn.ffmpeg.org/ffmpeg/trunk

patch by Anssi Hannula, anssi.hannula gmail com

Originally committed as revision 8643 to svn://svn.ffmpeg.org/ffmpeg/trunk