Stream data processing device, stream data processing method, program, and medium

• US 20040215803A1
• Filed: 05/12/2004
• Published: 10/28/2004
• Est. Priority Date: 04/02/2002
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Okamoto, Satoshi, Gotoh, Shouichi, Yamada, Mikihiko
• Granted Patent: US 7,680,946 B2
• Time in Patent Office: Days
• US Class Current: 709/231
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/2441 relying on flow classification, e.g. using integrated services [IntServ]
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04L 65/762 at the source reformatting of additional data in video distribution servers H04N21/2355
• CPC Class Codes: H04L 69/12 Protocol engines
• CPC Class Codes: H04L 69/22 Parsing or analysis of headers
• CPC Class Codes: H04N 21/434 Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream demultiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00

Abstract

A stream data processor suitable for various applications and which performs the process of various types of stream inputs in packet data. In the stream data processor which decides individually and sequentially whether packets forming an input stream are to be processed by a predetermined process, after stream data is temporarily stored packet by packet, packet selection and data processing based on a packet identifier present in any bit position are possible.

Claims

1. A stream data processor of processing and editing one or a plurality of data streams, comprising one or a plurality of stream input portions of receiving an input data stream and performing detection of a packet header and data transfer to a buffer of storing packets;

an arbitration portion of performing arbitration of a request of data transfer to the buffer of storing packets;

a buffer cell allocation directing device of directing allocation of a buffer cell, one of buffers, for input of the packet header;

a buffer cell allocator of allocating an unused buffer cell based on buffer cell allocation information, according to the direction of allocation of the buffer cell;

a buffer cell allocation information storing portion of storing the buffer cell allocation information;

a packet buffer of storing the packet data;

a packet buffer controller of controlling the packet buffer;

a process-waiting buffer cell information storing portion of storing a buffer cell to be processed and its process order;

a packet filter of determining whether to be processed or not based on a packet identifier;

one or a plurality of packet data processing portions of performing a predetermined process for the packet data; and

one or a plurality of stream output portions of reconstructing the packet data as a stream and then outputting the stream.

2. The stream data processor according to claim 1, wherein the packet buffer comprises one storage, and the stream input portions and the processing portions respectively perform arbitration and data transfer for the packet buffer to perform packet data processing.

3. The stream data processor according to claim 1, wherein the packet filter is connected to the arbitration portion, and the packet filter obtains the packet identifier of a packet stored in the packet buffer by performing data transfer request to the arbitration portion and determines whether to be processed or not.

4. The stream data processor according to claim 1, wherein the packet filter is connected to a controller, the controller supplies a packet identifier that is read from a packet stored in the packet buffer to the packet filter, and based on this, the packet filter determines whether to be processed or not.

5. The stream data processor according to claim 1, wherein a plurality of packet filters of determining, from the packet identifier of packet data included in a specific type of stream, whether to be processed or not are provided to enable identification with the packet identifiers of packets included in different types of stream data.

6. The stream data processor according to claim 1, wherein the stream data processor has a packet filter which comprises a packet identifier reference table, a packet identifier mask table of making all or specific part of a packet identifier out of identification, an AND operator, and a comparator, and which determines whether a packet is to be processed or not by comparing a logical product of a packet identifier in the packet data and the packet identifier mask table and a logical product of the packet identifier reference table and the packet identifier mask table, and wherein identification of a packet included in stream data in which a bit length of a packet identifier is different is made possible.

7. The stream data processor according to claim 6, wherein the stream data processor further has a process content table corresponding one-to-one to the packet identifier reference table, a packet having a specific packet identifier is detected by the packet filter, and process of the packet is performed by referring to the process content table.

8. The stream data processor according to claim 1, wherein the stream data processor has a packet filter which comprises a packet identifier reference table, a stream identifier reference table, an AND operator, and a comparator, and which determines whether a packet is to be processed or not by comparing a packet identifier in the packet data and the packet identifier reference table as well as comparing a stream identifier in the packet data and the stream identifier reference table, and wherein packet selection is possible even when there is duplication of packet identifiers among a plurality of streams.

9. The stream data processor according to claim 8, wherein the stream data processor further has a process content table corresponding one-to-one to the stream identifier reference table, and process of a packet having a specific packet identifier included in a specific data stream is performed by referring to the process content table.

10. The stream data processor according to claim 1, wherein the stream data processor has a packet filter which comprises a packet identifier reference table, a packet identifier mask table of making all or specific part of a packet identifier out of identification, a stream identifier reference table, an AND operator, and a comparator, and which determines whether a packet is to be processed or not by comparing a logical product of a packet identifier in the packet data and the packet identifier mask table and a logical product of the packet identifier reference table and the packet identifier mask table as well as comparing a stream identifier in the packet data and the stream identifier mask table, and wherein identification of a packet included in a plurality of stream data in which a packet identifier has a different bit length is possible.

11. The stream data processor according to claim 10, wherein the stream data processor further has a process content table corresponding one-to-one to the packet identifier reference table, and process of a packet having a specific packet identifier included in a specific data stream is performed by referring to the process content table.

12. The stream data processor according to claim 1, wherein the process-waiting buffer cell information storing portion of storing a number of a buffer cell to be processed comprises one storage element of storing the number of a buffer processed in the packet data processing portion in its process order.

13. The stream data processor according to claim 1, wherein the process-waiting buffer cell information storing portion of storing a number of a buffer cell to be processed comprises one storage element of storing the number of a buffer processed in the packet data processing portion in its process order and further stores the content of a predetermined process performed in the packet data processing portion.

14. The stream data processor according to claim 1, wherein the process-waiting buffer cell information storing portion of storing a number of a buffer cell to be processed comprises one storage element of storing the number of a buffer processed in the packet data processing portion in its process order and further stores the number of a table for referring to the process content.

15. The stream data processor according to claim 1, wherein in the buffer cell allocation information storing portion of storing buffer cell allocation information, when there is no buffer to be allocated, that is, all buffers are used, this is detected in the buffer cell allocator, and no buffer is allocated for a buffer cell allocation request.

17. A program of making a computer function as all or part of one or a plurality of stream input portions of receiving an input data stream and performing detection of a packet header and data transfer to a buffer of storing a packet;

an arbitration portion of performing arbitration of a request of data transfer to the buffer of storing the packet;

a buffer cell allocation directing device of directing allocation of a buffer cell, one of buffers, for input of the head of the packet;

a buffer cell allocator of allocating an unused buffer cell based on buffer cell allocation information, according to the direction of allocation of the buffer cell;

a buffer cell allocation information storing portion of storing the buffer cell allocation information;

a packet buffer of storing the packet data;

a packet buffer controller of controlling the packet buffer;

a process-waiting buffer cell information storing portion of storing a buffer cell to be processed and its process order;

a packet filter of determining whether to be processed or not based on a packet identifier;

one or a plurality of packet data processing portions of performing a predetermined process for the packet data; and

one or a plurality of stream output portions of reconstructing the packet data as a stream for output in the stream data processor according to claim 1.

18. A medium supporting the program according to claim 17, which can be processed by a computer.

16. A stream data processing method of processing and editing one or a plurality of data streams, comprising the steps of:

receiving an input data stream by one or a plurality of input portions and performing detection of a packet header and data transfer to a buffer of storing packets;

performing arbitration of a request of data transfer to the buffer of storing packets by an arbitration portion;

directing allocation of a buffer cell, one of buffers, for input of the packet header by a directing device;

allocating an unused buffer cell based on buffer cell allocation information, according to the direction of allocation of the buffer cell by a buffer cell allocator;

storing the buffer cell allocation information by a buffer cell allocation information storing portion;

storing the packet data by a packet buffer;

controlling the packet buffer by a packet buffer controller;

storing a buffer cell to be processed and its process order by a process-waiting buffer cell information storing portion;

determining whether to be processed or not based on a packet identifier by a packet filter;

performing a predetermined process for the packet data by one or a plurality of packet data processing portions; and

reconstructing the packet data as a stream for output by one or a plurality of stream output portions,