Neighboring Context Management
In one aspect, there is provided a system including a video decoder and a context manager. The context manager is coupled to the video decoder. The context manager may manage context information for decoding video data (e.g., macroblocks). Specifically, the context manager may prefetch context information representative of a first macroblock before a second macroblock is decoded by the video decoder. The first macroblock may be adjacent to the second macroblock. The prefetched context enables the video decoder to decode the second macroblock.
1 . A system comprising
a video decoder; and
a context manager, coupled to the video decoder, for managing context information, the context manager fetches context information representative of a first macroblock adjacent to a second macroblock being decoded by the video decoder, the fetched context information enabling the video decoder to decode the second macroblock.
2 . The system of claim 1 , wherein the context manager further comprises:
fetching the context information by prefetching the context information before the context information is used to decode the second macroblock.
3 . The system of claim 1 , wherein the context manager further comprises:
an arbiter to enable the context manager to communicate with the video decoder.
4 . The system of claim 1 , wherein the context manager further comprises:
an arbiter to enable the context manager to communicate with one or more of the following blocks of the video decoder; a reverse entropy block, an inverse transform block, a motion compensation block, and a deblocker block.
5 . The system of claim 4 , wherein the arbiter further comprises:
controlling, by the arbiter, traffic between the context manager and one or more of the following: the reverse entropy block, the inverse transform block, the motion compensation block, and the deblocker block.
6 . The system of claim 5 , wherein the arbiter further comprises:
controlling, by the arbiter, traffic during a read operation from the context manager to one or more of the following: the reverse entropy block, the inverse transform block, the motion compensation block, and the deblocker block.
7 . The system of claim 5 , wherein the arbiter further comprises:
controlling, by the arbiter, traffic using a handshaking protocol to enable the context manager to communication with one or more of the following: the reveres entropy block, the inverse transform block, the motion compensation block, and the deblocker block.
8 . The system of claim 1 , wherein the context manager further comprises:
a first arbiter block for controlling communication to memory of the context manager; and
a second arbiter for controlling communication among a processor, a memory interface, and one or more of the following blocks of the video decoder: a reveres entropy block, an inverse transform block, a motion compensation block, and a deblocker block.
9 . The system of claim 1 further comprising:
a frame buffer coupled to the video decoder, the frame buffer storing images for use in motion compensation.
10 . The system of claim 1 further comprising:
implementing the first macroblock as a data structure including data representative of pixels.
11 . The system of claim 1 , wherein the context manager further comprises:
a buffer for storing the context information representing one or more of the following: a motion vector, an absolute motion vector differential, reference indices, context adaptive variable length coding (CAVLC) coefficients, and inverse transform prediction modes.
12 . The system of claim 1 , wherein the context manager further comprises:
prefetching context information for a set of macroblocks, the prefetched context information enabling the video decoder to decode the second macroblock.
13 . The system of claim 1 , wherein the context manage further comprises:
implementing the context manager and the video decoder in a package comprising one or more of the following: a chip, an integrated circuit, a field programmable gate array (FPGA) chip, and an application specific integrated circuit (ASIC) chip.
14 . The system of claim 1 , wherein the context manager further comprises:
implementing the context manager on a package separate from another package implementing the video decoder.
15 . A method comprising:
fetching, by a context manager, context information representative of a first macroblock adjacent to a second macroblock being decoded by the video decoder; and
providing the fetched context information to a video decoder to enable the video decoder to decode the second macroblock.
16 . The method of claim 15 , wherein fetching further comprises:
fetching the context information by prefetching the context information before the context information is used to decode the second macroblock.
17 . The method of claim 15 , wherein fetching further comprises:
enabling, by an arbiter, the context manager to communicate with the video decoder.
18 . The method of claim 15 , wherein fetching further comprises:
enabling, by an arbiter, the context manager to communicate with one or more of the following blocks of the video decoder: a reverse entropy block, an inverse transform block, a motion compensation block, and a deblocker block.
19 . The method of claim 18 , wherein enabling further comprises:
controlling, by the arbiter, traffic between the context manager and one or more of the following: the reverse entropy block, the inverse transform block, the motion compensation block, and the deblocker block.
20 . The method of claim 19 , wherein controlling further comprises:
controlling, by the arbiter, traffic during a read operation to one or more of the following: the reverse entropy block, the inverse transform block, the motion compensation block, and the deblocker block.
21 . The method of claim 19 , wherein controlling further comprises:
controlling, by the arbiter, traffic using a handshaking protocol to enable the context manager to communication with one or more of the following: the reverse entropy block, the inverse transform block, the motion compensation block, and the deblocker block.
22 . The method of claim 15 further comprising:
controlling, at a first arbiter block, communication to memory of the context manager; and
controlling, at a second arbiter, communication among a processor, a memory interface, and one or more of the following blocks of the video decoder: a reverse entropy block, an inverse transform block, a motion compensation block, and a deblocker block.
23 . The method of claim 15 further comprising:
storing, at a frame buffer coupled to the video decoder, images for use in motion compensation.
24 . The method of claim 15 further comprising:
implementing the first macroblock as a data structure including data representative of pixels.
25 . The method of claim 15 further comprising:
storing, at a buffer, the context information representing one or more of the following: a motion vector, an absolute motion vector differential, reference indices, context adaptive variable length coding (CAVLC) coefficients, and inverse transform prediction modes.
26 . The method of claim 15 further comprising:
prefetching the context information for a set of macroblocks, the prefetched context information enabling the video decoder to decode the second macroblock.
27 . The method of claim 15 further comprising:
implementing the context manager and the video decoder in a package comprising one or more of the following: a chip, an integrated circuit, a field programmable gate array (FPGA) chip, and an application specific integrated circuit (ASIC) chip.
28 . The method of claim 15 further comprising:
implementing the context manager on a package separate from another package implementing the video decoder.
29 . A device comprising:
a context manager for managing context information, the context manager prefetches context information for a first macroblock adjacent to a second macroblock, the context information prefetched to enable decoding of a second macroblock.
30 . The device of claim 29 , wherein the context manager further comprises:
an output coupled to a video decoder, the output providing the prefetched information to the video decoder.