COMMUNICATION APPARATUS AND COMMUNICATION METHOD

• US 20090198713A1
• Filed: 12/04/2008
• Published: 08/06/2009
• Est. Priority Date: 02/06/2008
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Sato, Jun, Kawashima, Yuji
• Granted Patent: US 8,031,717 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04N 2005/91364 the video signal being scrambled
• CPC Class Codes: H04N 21/2541 Rights Management protecting software against unauthorised usage in a vending or licensing environment G06F21/10; security in data switching network management H04L41/28; security management or policies for network security H04L63/20; access security in wireless networks H04W12/08
• CPC Class Codes: H04N 21/4147 PVR [Personal Video Recorder] H04N5/76 takes precedence ; arrangements for broadcast with accumulation-type receivers H04H20/40
• CPC Class Codes: H04N 21/4184 providing storage capabilities, e.g. memory stick
• CPC Class Codes: H04N 21/4408 involving video stream encryption, e.g. re-encrypting a decrypted video stream for redistribution in a home network
• CPC Class Codes: H04N 21/4627 Rights management associated to the content security in data switching network management H04L41/28; security management or policies for network security H04L63/20; access security in wireless networks H04W12/08
• CPC Class Codes: H04N 21/47205 for manipulating displayed content, e.g. interacting with MPEG-4 objects, editing locally
• CPC Class Codes: H04N 21/835 Generation of protective data, e.g. certificates protecting software against unauthorised usage in a vending or licensing environment G06F21/10
• CPC Class Codes: H04N 21/8455 involving pointers to the content, e.g. pointers to the I-frames of the video stream
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection
• CPC Class Codes: H04N 9/8205 involving the multiplexing of an additional signal and the colour video signal

Abstract

When stored stream data is deleted/edited, the packet sequence completely included in a deletion range is deleted from the stream data, and the stream data is segmented into first stream data before the start point of the deletion range and second stream data after the end point of the deletion range. First and second stream management data corresponding to the first and second stream data are generated. The index value of the packet including the start point of the deletion range is written in the header of the first stream management data. The index value of the packet including the end point of the deletion range is written in the header of the second stream management data. In addition, an index base value for correcting the index value is written in the header of the second stream management data.

Claims

1. A communication apparatus comprising:

a receiver which receives a plurality of packets including an encoded content;

a sequence data generating unit which generates a plurality of sequence data including a predetermined number of packets;

a management data generating unit which generates management data including a header and a plurality of data tables generated in correspondence to the packet including an intra-coded content, wherein the data table includes a packet index area identifying the packet number corresponding to the packet including the intra-coded content, and the header includes a number of packet information areas identifying the predetermined packets and a packet index base value area to be used for correcting the packet index in the packet index area;

a storage control unit which stores the plurality of sequence data and the management data; and

a deleting unit which deletes at least one of the sequence data whose packets are to be completely deleted in response to a delete instruction,

wherein the sequence data generating unit generates first sequence data which includes at least one sequence data located before the deleted at least one sequence data and second sequence data which includes at least one sequence data located after the deleted sequence data, and the management data generating unit generates first management data corresponding to the first sequence data and second management data corresponding to the second sequence data.

2. The communication apparatus according to claim 1, wherein the first management data includes a first header whose packet index base value area stores no data and first data tables, and the second management data includes a second header whose packet index base value area stores a packet number indicating the packet at the head of packets included in the second sequence and second data tables.

3. The communication apparatus according to claim 1, wherein the first and second headers further include a start packet index area identifying an initial packet to be played and an end packet index area identifying a last packet to be played.

4. The communication apparatus according to claim 3, wherein the end packet index area included in the first header stores a packet index value of the initial packet designated by the delete instruction and the start packet index area included in the second header stores a packet index value of the last packet designated by the delete instruction.

5. The communication apparatus according to claim 2, further comprising an index correcting unit which corrects the packet number of each data table included in the second management data by subtracting the packet number in the packet index base value are of the second header from the packet number of data table of the second management data.

6. A communication apparatus comprising:

a receiver which receives a plurality of packets including an encoded content;

a sequence data generating unit which generates a plurality of sequence data including a predetermined number of packets;

a management data generating unit which generates management data including a header and a plurality of data tables generated in correspondence to the packet including an intra-coded content, wherein the data table includes a time stamp area identifying the presentation time stamp corresponding to the packet including the intra-coded content, and the header includes a number of packet information areas identifying the predetermined packets and a time stamp base value area to be used for correcting the presentation time stamp in the packet index area;

a storage control unit which stores the plurality of sequence data and the management data; and

deleting unit which deletes at least one of the sequence data whose packets are to be completely deleted in response to a delete instruction,

wherein the sequence data generating unit generates first sequence data which includes at least one sequence data located before the deleted at least one sequence data and second sequence data which includes at least one sequence data located after the deleted sequence data, and the management data generating unit generates first management data corresponding to the first sequence data and second management data corresponding to the second sequence data.

7. The communication apparatus according to claim 6, wherein the first management data includes a first header whose time stamp base value area stores no data and first data tables, and the second management data includes a second header whose time stamp base value area stores a presentation time stamp indicating the packet at the head of packets included in the second sequence and second data tables.

8. The communication apparatus according to claim 6, wherein the first and second headers further include a start time area identifying an initial packet to be played and an end time area identifying a last packet to be played.

9. The communication apparatus according to claim 8, wherein the end time area included in the first header stores a presentation time stamp of the initial packet designated by the delete instruction and the start time area included in the second header stores a presentation time stamp of the last packet designated by the delete instruction.

10. The communication apparatus according to claim 7, further comprising a time correcting unit which corrects a presentation time stamp of each data table included in the second management data by subtracting the presentation time stamp in the time stamp base value of the second header from the presentation time stamp of data table of the second management data.

11. A communication method comprising:

receiving a plurality of packets including an encoded content;

generating a plurality of sequence data including a predetermined number of packets;

generating management data including a header and a plurality of data tables generated in correspondence to the packet including an intra-coded content, wherein the data table includes a packet index area identifying the packet number corresponding to the packet including the intra-coded content, and the header includes a number of packet information areas identifying the predetermined packets and a packet index base value area to be used for correcting the packet index in the packet index area;

storing the plurality of sequence data and the management data; and

deleting at least one of the sequence data whose packets are to be completely deleted in response to a delete instruction,

wherein the generating the plurality of sequence data generates first sequence data which includes at least one sequence data located before the deleted at least one sequence data and second sequence data which includes at least one sequence data located after the deleted sequence data, and the generating the management data generates first management data corresponding to the first sequence data and second management data corresponding to the second sequence data.

12. The communication method according to claim 11, wherein the first management data includes a first header whose packet index base value area stores no data and first data tables, and the second management data includes a second header whose packet index base value area stores packet number indicating the packet at the head of packets included in the second sequence and second data tables.

13. The communication method according to claim 11, wherein the first and second headers further include a start packet index area identifying an initial packet to be played and an end packet index area identifying a last packet to be played.

14. The communication method according to claim 13, wherein the end packet index area included in the first header stores a packet index value of the initial packet designated by the delete instruction and the start packet index area included in the second header stores packet index value of the last packet designated by the delete instruction.

15. The communication method according to claim 12, further comprising correcting the packet number of each data table included in the second management data by subtracting the packet number in the packet index base value of the second header from the packet number of data table of the second management data.

16. A communication method comprising:

receiving a plurality of packets including an encoded content;

generating a plurality of sequence data including a predetermined number of packets;

generating management data including a header and a plurality of data tables generated in correspondence to the packet including an intra-coded content, wherein the data table includes a time stamp area identifying the presentation time stamp corresponding to the packet including the intra-coded content, and the header includes a number of packet information areas identifying the predetermined packets and a time stamp base value area to be used for correcting the presentation time stamp in the packet index area;

storing the plurality of sequence data and the management data; and

deleting at least one of the sequence data whose packets are to be completely deleted in response to a delete instruction,

wherein the generating the plurality of sequence data generates first sequence data which includes at least one sequence data located before the deleted at least one sequence data and second sequence data which includes at least one sequence data located after the deleted sequence data, and the generating the management data generates first management data corresponding to the first sequence data and second management data corresponding to the second sequence data.

17. The communication method according to claim 16, wherein the first management data includes a first header whose time stamp base value area stores no data and first data tables, and the second management data includes a second header whose time stamp base value area stores a presentation time stamp indicating the packet at the head of packets included in the second sequence and second data tables.

18. The communication method according to claim 16, wherein the first and second headers further include a start time area identifying an initial packet to be played and an end time area identifying a last packet to be played.

19. The communication method according to claim 18, wherein the end time area included in the first header stores a presentation time stamp of the initial packet designated by the delete instruction and the start time area included in the second header stores a presentation time stamp of the last packet designated by the delete instruction.

20. The communication method according to claim 17, further comprising correcting the presentation time stamp of each data table included in the second management data by subtracting the presentation time stamp in the time stamp base value of the second header from the presentation time stamp of data table of the second management data.