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https://github.com/moonlight-stream/moonlight-android.git
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63 lines
1.5 KiB
Lua
63 lines
1.5 KiB
Lua
-- H264 NAL Parser
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-- Version: 1.0
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-- Cameron Gutman
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-- NAL header
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local nal_start = ProtoField.bytes("nal.start", "H264 NAL Start Sequence") -- 4 Byte Start
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local nal_type = ProtoField.uint8("nal.type", "H264 NAL Type") -- 1 byte NAL type
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local nal_data = ProtoField.bytes("nal.data", "H264 NAL Data") -- variable byte NAL data
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p_h264raw = Proto("h264raw", "H264 Raw NAL Parser")
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p_h264raw.fields = {
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nal_start,
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nal_type,
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nal_data
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}
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function p_h264raw.dissector(buf, pkt, root)
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pkt.cols.protocol = p_h264raw.name
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subtree = root:add(p_h264raw, buf(0))
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local i = 0
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local data_start = -1
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while i < buf:len() do
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-- Make sure we have a potential start sequence and type
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if buf:len() - i < 5 then
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-- We need more data
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pkt.desegment_len = DESEGMENT_ONE_MORE_SEGMENT
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pkt.desegment_offset = 0
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return
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end
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-- Check for start sequence
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start = buf(i, 4):uint()
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if start == 1 then
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if data_start ~= -1 then
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-- End the last NAL
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subtree:add(nal_data, buf(data_start, i-data_start))
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end
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-- This is the start of a NAL
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subtree:add(nal_start, buf(i, 4))
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i = i + 4
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-- Next byte is NAL type
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subtree:add(nal_type, buf(i, 1), buf(i, 1):uint8())
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i = i + 1
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-- Data begins here
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data_start = i
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else
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-- This must be a data byte
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i = i + 1
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end
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end
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end
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function p_h264raw.init()
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end
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local udp_dissector_table = DissectorTable.get("rtp.pt")
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udp_dissector_table:add(96, p_h264raw)
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