[특허]System, server, and method for variable bit rate multimedia streaming

Kasenna, Inc.

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특허 상세정보

MyON담기

내보내기 페이스북 공유 트위터 공유 카카오톡 공유

System, server, and method for variable bit rate multimedia streaming

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	G06F-015/16
미국특허분류(USC)	709/230; 709/223; 709/224; 709/232; 370/229; 370/231; 370/232
출원번호	US-0917198 (2001-07-27)
등록번호	US-7310678 (2007-12-18)
발명자 / 주소	Gunaseelan,Lakshminarayanan Kordale,Rammohan
출원인 / 주소	Kasenna, Inc.
대리인 / 주소	Perkins Coie LLP
인용정보	피인용 횟수 : 28 인용 특허 : 7

초록
▼

System, method, and computer program products for implementing techniques for efficient delivery of variable bit rate streaming media assets having a variety of data formats. An embodiment provides delivery system for use in client server computer architecture in which server provides streaming media assets to at least one client over computer network, wherein media assets can have plurality of data formats, including a packet producer that acquires a streaming media asset in packetized form and places time stamps on packets that specify delivery time for each packet, a time stamp packet queue containing the packets with time stamps in a first in, first out order; and a feeder module that removes packets from the time stamp packet queue and transmits the removed packets to a client via the computer network, transmission for each packet concluded at least by the specified delivery time in each packet.

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청구항
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What is claimed is: 1. A delivery system for use in a client server computer architecture in which the server provides streaming media assets to at least one client over a computer network, wherein the media assets can have a plurality of data formats, comprising: a packet producer that acquires at least one streaming media asset in packetized form and places time stamps on the packets, each time stamp specifying a delivery time for its respective packet, wherein the packet producer adjusts the delivery time of at least one time stamp in accordance with a value indicating a maximum buffer size of a receiving client; a time stamp packet queue containing the packets with time stamps in a first in, first out order; and a feeder module that removes packets from the time stamp packet queue and transmits the removed packets to a client via the computer network according to the time stamp in each packet, the transmission for each packet concluded at least by the specified delivery time in each packet; wherein the feeder module is further operative to control the admission of streaming media assets into the feeder that are to be delivered to a client, the control of admission and comprising: defining a time window in terms of a first duration of time; computing a number of bytes that need to be delivered during the time window, the bytes comprising a first streaming media asset; translating the computed number of bytes into a first time to process value for the first streaming media asset; and admitting for delivery the first streaming media asset if the first time to process value is smaller than the time window. 2. The delivery system of claim 1, wherein the packet producer further comprises: a stream reader; and a stream processor. 3. The delivery system of claim 1, further comprising a plurality of packet producers, each packet producer of said plurality supporting a different data format. 4. The delivery system of claim 1, wherein the stream reader obtains a streaming media asset in the form of a packetized stream of data and passes it to the stream processor. 5. The delivery system of claim 4, wherein the stream processor is configured to process data in accordance with a predetermined format and places delivery time stamps on data packets received from the stream reader. 6. The delivery system of claim 4, wherein the stream reader and stream processor share a common thread of control. 7. The delivery system of claim 1, wherein the streaming media asset comprises packets having uniform size and delivery times at irregular intervals. 8. The delivery system of claim 1, wherein the streaming media asset comprises packets having variable size and delivery times at irregular intervals. 9. The delivery system of claim 1, wherein the streaming media asset comprises packets having uniform size and delivery times of regular intervals. 10. The delivery system of claim 1, further comprising multiple feeder modules. 11. The delivery system of claim 1, further comprising multiple time stamped packet queues. 12. A delivery system for use in a client server computer architecture in which the server provides streaming media assets to at least one client over a computer network, wherein the media assets can have a plurality of data formats, comprising: a packet producer that acquires at least one streaming media asset in packetized form and places time stamps on the packets, each time stamp specifying a delivery time for its respective packet, wherein the packet producer adjusts the delivery time of at least one time stamp in accordance with a value indicating a pre read size capability of a receiving client; a time stamp packet queue containing the packets with time stamps in a first in, first out order; a feeder module that removes packets from the time stamp packet queue and transmits the removed packets to a client via the computer network, the transmission for each packet concluded at least by the specified delivery time in each packet; wherein the feeder module further operative to control the admission of streaming media assets into the feeder that are to be delivered to a client, the control of admission comprising defining a time window in terms of a first duration of time; computing a number of bytes that need to be delivered during the time window, the bytes comprising a first streaming media asset; translating the computed number of bytes into a first time to process value for the first streaming media asset; and admitting for delivery the first streaming media asset if the first time to process value is smaller than the time window. 13. The delivery system of claim 12, wherein the packet producer further comprises: a stream reader; and a stream processor. 14. The delivery system of claim 12, further comprising a plurality of packet producers, each packet producer of said plurality supporting a different data format. 15. The delivery system of claim 12, wherein the stream reader obtains a streaming media asset in the form of a packetized stream of data and passes it to the stream processor. 16. The delivery system of claim 15, wherein the stream processor is configured to process data in accordance with a predetermined format and places delivery time stamps on data packets received from the stream reader. 17. The delivery system of claim 16, wherein the stream reader and stream processor share a common thread of control. 18. The delivery system of claim 12, wherein the streaming media asset comprises packets having uniform size and delivery times at irregular intervals. 19. The delivery system of claim 12, wherein the streaming media asset comprises packets having variable size and delivery times at irregular intervals. 20. The delivery system of claim 12, wherein the streaming media asset comprises packets having uniform size and delivery times of regular intervals. 21. The delivery system of claim 12, further comprising multiple feeder modules. 22. The delivery system of claim 12, further comprising multiple time stamped packet queues. 23. The delivery system of claim 12, wherein the control of admission further comprising: computing a number of bytes that need to be delivered during the time window, the bytes comprising at least one additional streaming media asset; translating the computed number of bytes into at least one additional time to process value for the at least one additional streaming media asset; adding the at least one additional time to process value to the first time to process value; and admitting for delivery the at least one additional streaming media asset if the at least one additional time to process value is smaller than the time window. 24. The delivery system of claim 12, wherein the packet producer comprises a stream reader and a stream processor, the stream processor configured to process data in accordance with a predetermined data format, the stream reader obtaining a streaming media asset in the form of a packetized stream of data and passing it to the stream processor, the stream processor placing delivery time stamps on the received data packets, wherein at least one of the time stamps is adjusted for an early delivery in accordance with the receiving client's pre-read size capability. 25. In a delivery system for use in a client server computer architecture in which the server provides streaming media assets that can have a plurality of data formats to at least one client over a computer network, a method for delivering the streaming media assets comprising: acquiring at least one streaming media asset in packetized form, placing time stamps on the packets specifying a delivery time for its respective packet, and adjusting the delivery time of at least one time stamp in accordance with a value indicating a pre read size capability of a receiving client; maintaining a time stamp packet queue containing the packets with time stamps in a first in, first out order; removing packets from the time stamp packet queue and transmitting the removed packets to a client via the computer network according to the time stamp in each packet, the transmission for each packet concluded at least by the specified delivery time in each packet; and controlling the admission of streaming media assets into the time stamp packet queue that are to be delivered to a client; wherein the control of admission further comprising: defining a time window in terms of a first duration of time; computing a number of bytes that need to be delivered during the time window, the bytes comprising a first streaming media asset; translating the computed number of bytes into a first time to process value for the first streaming media asset; adding the first time to process value to a cumulative time to process value; and admitting for delivery the first streaming media asset if the cumulative time to process value is smaller than the time window. 26. The method for delivering the streaming media assets in claim 25, further comprising: resolving delivery conflicts between at least two streaming media assets delivered simultaneously by the server to at least one client, wherein the at least one client has a pre read size value that indicates a capability of the client to pre read data, the streaming media assets comprising data packets having delivery time stamps. 27. The method for delivering the streaming media assets of claim 26, wherein the resolving of delivery conflicts further comprising: detecting a delivery conflict between the at least two streaming media assets; adjusting at least one of the time stamps to indicate an early delivery for at least one of the packets, wherein the adjusted time stamp is adjusted in accordance with the pre read size value; and delivering the packets at least by times specified by the time stamps. 28. The method for delivering the streaming media assets of claim 27, further comprising the step of the client communicating the pre read size value to the server when the client requests delivery of a streaming media asset. 29. The method for delivering the streaming media assets of claim 28, further comprising the steps of the server communicating to the client an optimum value for the pre read size value; and the client allocating sufficient resources to accommodate the optimum value for the pre read size value. 30. The method for delivering the streaming media assets of claim 25, further comprising: resolving delivery conflicts between at least two streaming media assets delivered simultaneously by the server to at least one client, wherein the at least one client has a max buffer size value that indicates a capability of the client to accept delayed data, the streaming media assets comprising data packets having delivery time stamps. 31. The method for delivering the streaming media assets of claim 30, wherein the resolving of delivery conflicts further comprising: detecting a delivery conflict between the at least two streaming media assets; adjusting at least one of the time stamps to indicate a delayed delivery for at least one of the packets, wherein the adjusted time stamp is adjusted in accordance with the max buffer size value; and delivering the packets at least by times specified by the time stamps. 32. The method for delivering the streaming media assets of claim 31, further comprising the step of the client communicating the max buffer size value to the server when the client requests delivery of a streaming media asset. 33. The method for delivering the streaming media assets of claim 31, further comprising the steps of the server communicating to the client an optimum value for the max buffer size value; and the client allocating sufficient resources to accommodate the max buffer size value having the optimum value. 34. The method for delivering the streaming media assets of claim 25, further comprising: controlling the admission of streaming media assets into the time stamp packet queue that are to be delivered to a client. 35. The method for delivering the streaming media assets of claim 25, further comprising: resolving delivery conflicts between at least two streaming media assets delivered simultaneously by the server to at least one client, wherein the at least one client has a pre read size value that indicates a capability of the client to pre read data, the streaming media assets comprising data packets having delivery time stamps. 36. The method for delivering the streaming media assets of claim 35, wherein the resolving of delivery conflicts further comprising: detecting a delivery conflict between the at least two streaming media assets; adjusting at least one of the time stamps to indicate an early delivery for at least one of the packets, wherein the adjusted time stamp is adjusted in accordance with the pre read size value; and delivering the packets at least by times specified by the time stamps. 37. The method for delivering the streaming media assets of claim 25, wherein the control of admission comprising: providing a space window comprising a value representing an amount of contiguously stored data; scanning with the space window a file containing a media asset to be transmitted from the server computer system to the client computer system; and returning a value representing the shortest duration of time over which the data contained in the space window can be delivered. 38. A computer program product stored on a computer readable medium for use in a client server computer architecture for delivering streaming media assets that can have a plurality of data formats to at least one client over a computer network, the computer program product including a program module that executes the steps of: acquiring at least one streaming media asset in packetized form; placing time stamps on the packets specifying a delivery time for its respective packet; adjusting the delivery time of at least one time stamp in accordance with a value indicating at least one of a pre read size capability and a maximum buffer size of a receiving client; maintaining a time stamp packet queue containing the packets with time stamps in a first-in, first-out order; removing packets from the time stamp packet queue and transmitting the removed packets to a client via the computer network according to the time stamp in each packet, the transmission for each packet concluded at least by the specified delivery time in each packet. controlling the admission of streaming media assets into the time stamp packet queue that are to be delivered to a client; the control of admission further comprising: defining a time window in terms of a first duration of time; computing a number of bytes that need to be delivered during the time window, the bytes comprising a first streaming media asset; translating the computed number of bytes into a first time to process value for the first streaming media asset; adding the first time to process value to a cumulative time to process value; and admitting for delivery the first streaming media asset if the cumulative time to process value is smaller than the time window. 39. A computer program product as in claim 38, further comprising: providing a space window comprising a value representing an amount of contiguously stored data; scanning with the space window a file containing a media asset to be transmitted from the server computer system to the client computer system; and returning a value representing the shortest duration of time over which the data contained in the space window can be delivered according to time stamps placed in the plurality of packets.

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System, server, and method for variable bit rate multimedia streaming

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System, server, and method for variable bit rate multimedia streaming

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