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→Download Play UDS protocol
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−Total_frames is at least 0x4 normally. When a sysupdate is included, total_frames is 0x4+<total frames required for the titlelist(normally 0x1)>.
+Total_frames is at least 0x4 normally. When a sysupdate is included, total_frames is 0x4+<total frames required for the titlelist(normally 0x1)>. Total_frames should be <=0x20, but the code doesn't check for this specific value.
−Frames:
+==== Checksum ====
+The checksum seed is the 4-byte output from [[PS:EncryptDecryptAes|encrypting]] zeros with AES-CTR using [[PSPXI:EncryptDecryptAes|keytype5]]. The CTR is the output from this: "for(i=0; i<0x10; i++)ctr[i] = ctrseed[i] ^ host_macaddress[i % 6];" This ctrseed is a fixed 0x10-byte random-data block stored in DLP-sysmodule .rodata.
+This seed is initialized after connecting to/creating the DLP network.
+The checksum stored in the above data frame header is then calculated using this checksum seed.
+==== Frames ====
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
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The structure of each spectator frame relative to "frame-specific payload" is described below.
The structure of each spectator frame relative to "frame-specific payload" is described below.
−==== Metadata frame ====
+===== Metadata frame =====
{| class="wikitable" border="1"
{| class="wikitable" border="1"
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If the u16 at frameheader+0x6 is less than 0x101, the 8-bytes at outptr are cleared to all-zero, instead of copying the data from offset 0x2E8.
If the u16 at frameheader+0x6 is less than 0x101, the 8-bytes at outptr are cleared to all-zero, instead of copying the data from offset 0x2E8.
−==== Icon gfx frame ====
+===== Icon gfx frame =====
{| class="wikitable" border="1"
{| class="wikitable" border="1"
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−==== Sysupdate titlelist frame ====
+===== Sysupdate titlelist frame =====
{| class="wikitable" border="1"
{| class="wikitable" border="1"
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