/usr/include/pjmedia-codec/ is in libpjproject-dev 2.1.0.0.ast20130823-1+deb8u1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/pjmedia-codec/amr_helper.h
/usr/include/pjmedia-codec/amr_sdp_match.h
/usr/include/pjmedia-codec/audio_codecs.h
/usr/include/pjmedia-codec/config.h
/usr/include/pjmedia-codec/config_auto.h
/usr/include/pjmedia-codec/config_auto.h.in
/usr/include/pjmedia-codec/ffmpeg_vid_codecs.h
/usr/include/pjmedia-codec/g722.h
/usr/include/pjmedia-codec/g7221.h
/usr/include/pjmedia-codec/g7221_sdp_match.h
/usr/include/pjmedia-codec/gsm.h
/usr/include/pjmedia-codec/h263_packetizer.h
/usr/include/pjmedia-codec/h264_packetizer.h
/usr/include/pjmedia-codec/ilbc.h
/usr/include/pjmedia-codec/ipp_codecs.h
/usr/include/pjmedia-codec/l16.h
/usr/include/pjmedia-codec/opencore_amr.h
/usr/include/pjmedia-codec/passthrough.h
/usr/include/pjmedia-codec/silk.h
/usr/include/pjmedia-codec/speex.h
/usr/include/pjmedia-codec/types.h