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Difference between revisions of "Cine/Specifications"
Added subheadings to the "Bit sequences in the compressed stream" section.
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(Added subheadings to the "Bit sequences in the compressed stream" section.) |
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depleted of bits then another chunk is read in etc. Each chunk's least significant | depleted of bits then another chunk is read in etc. Each chunk's least significant | ||
bit is the first bit read from it, the most significant bit is the last bit read from it etc. | bit is the first bit read from it, the most significant bit is the last bit read from it etc. | ||
=====First 32-bit chunk===== | |||
Because of the way the Delphine's decompressor routine handled the bit stream the first | Because of the way the Delphine's decompressor routine handled the bit stream the first | ||
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So all the less significant bits than the first chunk's highest set bit are valid source stream | So all the less significant bits than the first chunk's highest set bit are valid source stream | ||
bits (That means the highest set bit in the first chunk is always discarded). | bits (That means the highest set bit in the first chunk is always discarded). | ||
=====Command length===== | |||
First bit of a command always tells how many bits the whole command takes. | First bit of a command always tells how many bits the whole command takes. | ||
If the first bit of a command is zero, then the whole command (Including the | If the first bit of a command is zero, then the whole command (Including the | ||
first bit) takes two bits total, otherwise it takes three bits (i.e. the first bit is one). | first bit) takes two bits total, otherwise it takes three bits (i.e. the first bit is one). | ||
=====Command types===== | |||
There are two possible types of commands: | There are two possible types of commands: | ||
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Commands may have predefined values or a restricted value range for some of their parameters. | Commands may have predefined values or a restricted value range for some of their parameters. | ||
If a command's parameter isn't a predefined value then it is read from the source stream. | If a command's parameter isn't a predefined value then it is read from the source stream. | ||
=====All possible commands===== | |||
Here are all the possible commands (Including their first bit that tells the command's length): | Here are all the possible commands (Including their first bit that tells the command's length): | ||
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1 1 0 => copyRelocatedBytes(12 bits, 8 bits + 1) i.e. copyRelocatedBytes(0..4095, 1..256) | 1 1 0 => copyRelocatedBytes(12 bits, 8 bits + 1) i.e. copyRelocatedBytes(0..4095, 1..256) | ||
</pre> | </pre> | ||
=====Examples of parsing commands===== | |||
Some examples of parsing the commands: | Some examples of parsing the commands: | ||