Burst mode memory fetches when decoding compressed image data
AssigneeBroadcom Corporation
InventorMark Taunton
Life of this patent
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Abstract
An image data decompression apparatus for decoding blocks of motion compensated non-intra coded data uses a memory (14) storing reference picture data. A decoding processor (12) decodes a current block of a generated picture using lines of previously decoded image data from the memory (14) that are selected in dependence upon a motion vector (V1) for the current block. In order to improve access efficiency to the memory (14) the decoding processor (12) concatenates fetches into bursts for different sections of lines of previously decoded data that lie within a predetermined range within the memory addresses of the memory (14).
Claims11
Apparatus for decoding blocks of motion compensated non-intra coded compressed image data, said apparatus comprising:
- a memory for storing previously decoded image data;
- a decoding processor responsive to a motion vector of a block being decoded for fetching previously decoded image data from said memory for use in decoding said block;
- wherein
- decoding of a motion vector for a block being decoded takes place before a fetch is made for decoding of a preceding block;
- and
- said decoding processor concatenates fetches for at least one line of previously decoded data for different blocks being decoded into burst mode fetches.
A method of decoding blocks of motion compensated non-intra coded compressed image data, said method comprising the steps of:
- storing previously decoded image data in a memory;
- in response to a motion vector of a block being decoded, fetching previously decoded image data from said memory for use in decoding said block;
- wherein
- decoding of a motion vector for a block being decoded takes place before a fetch is made for decoding of a preceding block;
- and
- fetches for at least one line of previously decoded data for different blocks being decoded are concatenated into burst mode fetches.
Dependencies are inferred from the claim text.