Cisco Technology, Inc.

Other

Promos Technologies, Inc

Augusta Technology, Inc.

Dayin Gou

Shuguang Gong

Hain-Ching Liu

Xiaomei Liu

Yuen-Wen Lee

Madhavi Kadiyala

Apparatus having corresponding methods and tangible computer-readable media comprise: an input module to receive a bitstream representing data words encoded according to a variable-length code; a peek module to select a peek block comprising a predetermined number of consecutive bits in the bitstream; and a decoder to provide a plurality of the data words based on the peek block.

Combining transform coefficient decoding with variable length decoding

Inverse transforms used in video and image compression/decompression, such as DCT/IDCT used in MPEG-2 and MPEG-4, or the integer transforms used in H.264, are usually calculated with fast algorithms, which only take advantage of the symmetry existing in the transform matrix but ignores the peculiarities in the input data. While these kind of fast algorithms can apply to both forward and inverse transforms, they tend to be inefficient in calculating inverse transforms. In inverse transforms, most of the coefficients become zero after quantization, this invention takes advantage of this fact to further simplify the general fast algorithm and speed up the calculation.

Methods for calculating video inverse transform

The present invention addresses the issue of jitter and clock drifting in streaming media applications. The present invention utilizes the Real Time Transaction Protocol (RTP) to embed MPEG packets within RTP packets in a Multiple Program Transport Stream (MPTS). Each MPEG packet in an MPTS stream is tagged at a gateway with: an arrival timestamp, a per-flow index and internal index to identify where the packet resides in an RTP packet and within a stream. After demultiplexing, this information is utilized in conjunction with the sending timestamp of each RTP packet to create a sending time for each MPEG packet to aid in the reduction of jitter and clock drifting.

Removing jitter in RTP streaming media streams

An encapsulation method and an apparatus for encapsulating compressed media packet into IP packets. The encapsulating method includes accepting a compressed media data stream that may include null packets. The method further includes identifying any null packets in the accepted stream and the null packets' relative position in the stream, encapsulating the non-null compressed media data packets into a set of IP packets; and adding information to each IP packet sufficient to reconstruct a reconstructed compressed media data stream from the set of IP packets. The reconstructed stream may include null packets that were not present in the set of IP packets. The encapsulating includes discarding at least some of the null packets in the case that the compressed media data stream contains null packets. Also a method and apparatus for determining the timing of packets of compressed media data that are encapsulated by an encapsulation method that includes discarding null packets and including information about such discarding. The timing determining method includes accepting an IP packet encapsulating a subset of compressed media data packets of a compressed media data stream, and ascertaining if the IP packet includes information indicating whether or not null packets have been removed from the compressed media data stream. If such indicating information is included, the method includes determining from the included indicating information the timing of the encapsulated subset of packets and of any null packets that were removed from the section of the compressed media data stream that includes the encapsulated subset of packets.

Method and apparatus for transporting MPEG streams on IP networks including removing null packets

The present invention addresses the issue of jitter compounded by clock drifting in streaming media applications. In addressing jitter, the present invention attempts to recover the desired (de-jittered) arrival time at a gateway even if there is a frequency difference between the clocks of the original media source and the gateway. The desired arrival time is used with the addition of a constant to schedule the packet delivery time for delivery to a user via a network. Each packet arriving at the gateway contains an arrival timestamp. Using packets, which also contain sending time stamps, the invention determines the delivery time for each packet.

Removing jitter by adaptive slope tracking

A method and system of configuring an array of data is disclosed. The method and system comprise generating an array of data an order and reconfiguring the array of data into a plurality sub arrays of data, the plurality of sub arrays of data being in a desired order. By utilizing the method and system in accordance with the present invention, a converted data array can be processed in a parallel fashion thereby increasing the overall processing speed of the computer system. The present invention has particular utility when converting data either from a bit reverse order to a natural order or from a natural order to a bit reverse order. In accordance with the present invention, the array of data is reconfigured utilizing a swap operation to allow for conversion of the data array from either a bit reverse order to a natural order or from a natural order to a bit reversed order.

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San Jose, CA, United States of America

Dayin Gou