layer.md

layer

Layer i guess is the most important, and the most complicated part of the project file.

XML code for layer has quite "foldable" structure, which reminds exact structure of the layer in GUI. Also worth mentioning that the structure is quite repetetive:

<Layr>
    <ldta bdata="0000000c000200000000000100000000000078000000000000007800000e100000007800000000870000000000000000000000000000000000000001000100003c656d7074792074657874206c617965723e000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000"/>
    <string>&lt;empty text layer&gt;</string>
    <tdgp>
        <tdsb bdata="00000001"/>
        <tdsn>
            <string/>
        </tdsn>
        <tdmn bdata="4144424520546578742050726f706572746965730000000000000000000000000000000000000000"/>
        <tdgp>
            <tdsb bdata="00000001"/>
            <tdsn>
                <string>-_0_/-</string>
            </tdsn>
            <tdmn bdata="41444245205465787420446f63756d656e7400000000000000000000000000000000000000000000"/>
            <btds>
                <tdbs>
                    <tdsb bdata="00000001"/>
                    <tdsn>
                        <string>-_0_/-</string>
                    </tdsn>
                    <tdb4 bdata="db9900010001000000010004000078003f1a36e2eb1c432d3ff00000000000003ff00000000000003ff00000000000003ff00000000000000001000800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"/>
                    <cdat bdata="00000000"/>
                </tdbs>
                <btdk bdata="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            </btds>
            <btgu>
                <pgui bdata="4844b2a408be48af822cceec9c0cfd5c"/>
                <pgui bdata="00000000000000000000000000000000"/>
            </btgu>
            <tdmn bdata="4144424520546578742050617468204f7074696f6e73000000000000000000000000000000000000"/>
            <tdgp>
                <tdsb bdata="00000001"/>
                <tdsn>
                    <string>-_0_/-</string>
                </tdsn>
                <tdmn bdata="414442452047726f757020456e640000000000000000000000000000000000000000000000000000"/>
            </tdgp>
            <tdmn bdata="414442452054657874204d6f7265204f7074696f6e73000000000000000000000000000000000000"/>
            <tdgp>
                <tdsb bdata="00000001"/>
                <tdsn>
                    <string>-_0_/-</string>
                </tdsn>
                <tdmn bdata="414442452047726f757020456e640000000000000000000000000000000000000000000000000000"/>
            </tdgp>
            <tdmn bdata="414442452047726f757020456e640000000000000000000000000000000000000000000000000000"/>
        </tdgp>
        <tdmn bdata="41444245205472616e73666f726d2047726f75700000000000000000000000000000000000000000"/>
        <tdgp>
            <tdsb bdata="00000001"/>
            <tdsn>
                <string>-_0_/-</string>
            </tdsn>
            <tdmn bdata="4144424520506f736974696f6e5f3000000000000000000000000000000000000000000000000000"/>
            <tdbs>
                <tdsb bdata="00000003"/>
                <tdsn>
                    <string>-_0_/-</string>
                </tdsn>
                <tdb4 bdata="db990001000100000001ffff000078003f1a36e2eb1c432d3ff00000000000003ff00000000000003ff00000000000003ff00000000000000000000809000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"/>
                <cdat bdata="00000000000000000000000000000000000000000000000000000000000000000000000000000000"/>
                <tdum bdata="0000000000000000"/>
                <tduM bdata="0000000000000000"/>
            </tdbs>
            ...
        </tdgp>
        <tdmn bdata="41444245204c61796572205374796c65730000000000000000000000000000000000000000000000"/>
        <tdgp>
            <tdsb bdata="00000003"/>
            <tdsn>
                <string>-_0_/-</string>
            </tdsn>
            <tdmn bdata="4144424520426c656e64204f7074696f6e732047726f757000000000000000000000000000000000"/>
            <tdgp>
                <tdsb bdata="00000003"/>
                <tdsn>
                    <string>-_0_/-</string>
                </tdsn>
                <tdmn bdata="414442452041647620426c656e642047726f75700000000000000000000000000000000000000000"/>
                <tdgp>
                    <tdsb bdata="00000001"/>
                    <tdsn>
                        <string>-_0_/-</string>
                    </tdsn>
                    <tdmn bdata="414442452047726f757020456e640000000000000000000000000000000000000000000000000000"/>
                </tdgp>
                <tdmn bdata="414442452047726f757020456e640000000000000000000000000000000000000000000000000000"/>
            </tdgp>
            <tdmn bdata="64726f70536861646f772f656e61626c656400000000000000000000000000000000000000000000"/>
            <tdgp>
                <tdsb bdata="00000002"/>
                <tdsn>
                    <string>-_0_/-</string>
                </tdsn>
                <tdmn bdata="414442452047726f757020456e640000000000000000000000000000000000000000000000000000"/>
            </tdgp>
            ...
        </tdgp>
        <tdmn bdata="414442452045787472736e204f7074696f6e732047726f7570000000000000000000000000000000"/>
        <tdgp>
            <tdsb bdata="00000003"/>
            <tdsn>
                <string>-_0_/-</string>
            </tdsn>
            <tdmn bdata="4144424520426576656c20446972656374696f6e0000000000000000000000000000000000000000"/>
            <tdbs>
                <tdsb bdata="00000003"/>
                <tdsn>
                    <string>-_0_/-</string>
                </tdsn>
                <tdb4 bdata="db9900010001000000020000000078003f1a36e2eb1c432d3ff00000000000003ff00000000000003ff00000000000003ff00000000000000000000404000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"/>
                <cdat bdata="3ff00000000000000000000000000000000000000000000000000000000000000000000000000000"/>
            </tdbs>
            <tdmn bdata="414442452047726f757020456e640000000000000000000000000000000000000000000000000000"/>
        </tdgp>
        <tdmn bdata="41444245204d6174657269616c204f7074696f6e732047726f757000000000000000000000000000"/>
        <tdgp>
            <tdsb bdata="00000003"/>
            <tdsn>
                <string>-_0_/-</string>
            </tdsn>
            <tdmn bdata="41444245204170706561727320696e205265666c656374696f6e7300000000000000000000000000"/>
            <tdbs>
                <tdsb bdata="00000003"/>
                <tdsn>
                    <string>-_0_/-</string>
                </tdsn>
                <tdb4 bdata="db99000100010000ffff0004000078003f1a36e2eb1c432d3ff00000000000003ff00000000000003ff00000000000003ff00000000000000000000404000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"/>
                <cdat bdata="3ff00000000000000000000000000000000000000000000000000000000000000000000000000000"/>
            </tdbs>
            ...
        </tdgp>
        <tdmn bdata="4144424520417564696f2047726f7570000000000000000000000000000000000000000000000000"/>
        <tdgp>
            <tdsb bdata="00000003"/>
            <tdsn>
                <string>-_0_/-</string>
            </tdsn>
            <tdmn bdata="414442452047726f757020456e640000000000000000000000000000000000000000000000000000"/>
        </tdgp>
        <tdmn bdata="414442452047726f757020456e640000000000000000000000000000000000000000000000000000"/>
    </tdgp>
    <Gide>
        <gdta bdata="0000000000000000"/>
        <list>
            <lhd3 bdata="00d00bee000000000000000000000001000000100000000200000001000000020000000000000000000000000000000000000000"/>
        </list>
    </Gide>
</Layr>

Important note: every layer has a first child tag: <ldta>. This tag is quite important. From our experiments we found out that it contains not only some meta information.
But also information about position of the layer on the timeline, its size, what assset is used.

We were comparing the values of every layer in few saved variations of the same project:

// sample A
<ldta bdata="00000026000200000000000100000000000078000000000000007800000697800000003c0000008700000000000000000000000000000000000000010001000030303a303000000000000000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="000000240002000000000001000000000000780000000000000078000d1c5a00000078000000008700000000000000000000000000000000000000010001000030303a303100000000000000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="00000022000200000000000100000000000078000000000000007800000697800000003c00000087000000000000000000000000000000000000000100010000233030000000000000000000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="0000001c000200000000000100000000000078000000000000007800000697800000003c00000087000000000000000000000000000000000000000100010000747261636b206e616d650000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="0000001a000200000000000100000000000078000000000000007800000697800000003c00010087000000000000000000000000000000000000000100010000617274697374000000000000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="00000014000200000000000100000000000078000000000000007800000697800000003c0001008700000000000000000000000000000000000000010008000070726f677265737300000000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="00000016000200000000000100000000000078000000000000007800000697800000003c000100a700000000000000000000000000000000000000010008000070726f67726573735f626700000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="00000013000200000000000100000000000078000000000000007800000697800000003c00000027000000120000000000000000000000000000000100050000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="0000002d000200000000000100000000000078000000000000007800000697800000003c000100070000002c0000000000000000000000000000000100010000617564696f5f737065637472756d00000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="0000000e000200000000000100000000000078000000000000007800000697800000003c000000070000000d0000000000000000000000000000000100010000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="00000011000200000000000100003c00000078000000000000007800000697800000003c00000007000000100000000000000000000000000000000100050000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="0000002800020000000000010000000000007800000000000000780007c680000000780000000007000000270000000000000000000000000000000100070000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"/>

// sample B (second layer has been resized)
<ldta bdata="00000026000200000000000100000000000078000000000000007800000697800000003c0000008700000000000000000000000000000000000000010001000030303a303000000000000000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="000000240002000000000001000000000000780000000000000078000d2e8800000078000000008700000000000000000000000000000000000000010001000030303a303100000000000000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="00000022000200000000000100000000000078000000000000007800000697800000003c00000087000000000000000000000000000000000000000100010000233030000000000000000000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="0000001c000200000000000100000000000078000000000000007800000697800000003c00000087000000000000000000000000000000000000000100010000747261636b206e616d650000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="0000001a000200000000000100000000000078000000000000007800000697800000003c00010087000000000000000000000000000000000000000100010000617274697374000000000000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000300000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="00000014000200000000000100000000000078000000000000007800000697800000003c0001008700000000000000000000000000000000000000010008000070726f677265737300000000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="00000016000200000000000100000000000078000000000000007800000697800000003c000100a700000000000000000000000000000000000000010008000070726f67726573735f626700000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="00000013000200000000000100000000000078000000000000007800000697800000003c00000027000000120000000000000000000000000000000100050000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="0000002d000200000000000100000000000078000000000000007800000697800000003c000100070000002c0000000000000000000000000000000100010000617564696f5f737065637472756d00000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="0000000e000200000000000100000000000078000000000000007800000697800000003c000000070000000d0000000000000000000000000000000100010000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="00000011000200000000000100003c00000078000000000000007800000697800000003c00000007000000100000000000000000000000000000000100050000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"/>
<ldta bdata="0000002800020000000000010000000000007800000000000000780007c680000000780000000007000000270000000000000000000000000000000100070000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000001000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"/>

Byte decomposition:

• Byte 14 shows a starting time of the layer in frames. I'm not sure where it starts, maybe it's byte 12 or 10, and im not sure about lenght of the field.
• Bytes 28-32 most likely show the length in frames or final frame position of the layer.
• From byte 64 field contains the name of the layer, hex encoded, terminated with the value 0x00.
• Byte 131 shows some of predefined type for non-footage assets, as far as i understood, where 03 is a text, and 04 is a solid.
• And following that, bytes 40-43 reference the id, used in bytes 16-19 of the item footage definition in the fold.
• Byte 61 most likely describes an layer (used item in layer) type:

value	type
01	text
03	video
05	image (png)
07	audio (mp3)
08	solid
0f	composition (nested)