PeerStreamer

    while (!url_feof(s->pb)) {

        if (klv_read_packet(&klv, s->pb) < 0)

            return -1;

        PRINT_KEY(s, "read packet", klv.key);

        if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key)) {

            int res = mxf_decrypt_triplet(s, pkt, &klv);

            if (res < 0) {

            return -1;

        }

        PRINT_KEY(mxf->fc, "data definition   ul", source_track->sequence->data_definition_ul);

        st->codec->codec_type = mxf_get_codec_type(ff_mxf_data_definition_uls, &source_track->sequence->data_definition_ul);

        source_package->descriptor = mxf_resolve_strong_ref(mxf, &source_package->descriptor_ref, AnyType);

            av_log(mxf->fc, AV_LOG_INFO, "source track %d: stream %d, no descriptor found\n", source_track->track_id, st->index);

            continue;

        }

        PRINT_KEY(mxf->fc, "essence codec     ul", descriptor->essence_codec_ul);

        PRINT_KEY(mxf->fc, "essence container ul", descriptor->essence_container_ul);

        essence_container_ul = &descriptor->essence_container_ul;

        /* HACK: replacing the original key with mxf_encrypted_essence_container

         * is not allowed according to s429-6, try to find correct information anyway */

                if (local_tag == tag) {

                    memcpy(uid, mxf->local_tags+i*18+2, 16);

                    dprintf(mxf->fc, "local tag 0x%04X\n", local_tag);

                    PRINT_KEY(mxf->fc, "uid", uid);

                }

            }

        }

        if (klv_read_packet(&klv, s->pb) < 0)

            return -1;

        PRINT_KEY(s, "read header", klv.key);

        if (IS_KLV_KEY(klv.key, mxf_encrypted_triplet_key) ||

            IS_KLV_KEY(klv.key, mxf_essence_element_key)) {

            /* FIXME avoid seek */