Concurrent access shared buffer in a video encoder

Patent metadata

Field	Value
Publication number	US-9300975-B2
Application number	US-201213490549-A
Country	US
Kind code	B2
Filing date	Jun 7, 2012
Priority date	Sep 11, 2011
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

A video encoder includes a buffer, a DMA engine, a motion estimator and a motion compensator. The buffer includes four pages where macroblocks are stored. The motion estimator generates a motion vector for a given macroblock. The motion compensator applies the motion vectors generated by the motion estimator to a previously encoded frame. Each of the four pages is concurrently accessed by one of the motion estimator, the motion compensator, and a channel of the DMA engine. Simultaneously the motion compensator accesses one page of the buffer containing a first set of macroblocks, the motion estimator accesses a second page of the buffer containing a second set of macroblocks, a first DMA engine channel writes a different set of macroblocks to a third page of the buffer and a second DMA engine channel writes another set of macroblocks to a fourth page of the buffer.

First claim

What is claimed is:

1. An apparatus, comprising:
a buffer comprising four pages in which macroblocks of video are stored;
a direct memory access (DMA) engine comprising a plurality of channels, each DMA channel to write encoded macroblocks to the buffer;
a motion estimator to generate a motion vector for a given macroblock stored in the buffer; and
a motion compensator to use the motion vectors generated by the motion estimator to perform interpolation;
wherein, for a give…

Assignees

• Jagannathan Shyam
• Srinivasamurthy Naveen
• Texas Instruments Inc

Inventors

• Jagannathan Shyam
• Srinivasamurthy Naveen

Classifications

• H04N19/43

  Electricity · mapped topic

• H04N19/433 Primary

  Electricity · mapped topic