WO2006007322B1 - Providing synchronized information to multiple devices - Google Patents

Providing synchronized information to multiple devices

Info

Publication number
WO2006007322B1
WO2006007322B1 PCT/US2005/020139 US2005020139W WO2006007322B1 WO 2006007322 B1 WO2006007322 B1 WO 2006007322B1 US 2005020139 W US2005020139 W US 2005020139W WO 2006007322 B1 WO2006007322 B1 WO 2006007322B1
Authority
WO
WIPO (PCT)
Prior art keywords
ring buffer
information
communicated information
communicated
current position
Prior art date
Application number
PCT/US2005/020139
Other languages
French (fr)
Other versions
WO2006007322A3 (en
WO2006007322A2 (en
Inventor
Jeffrey C Moore
William G Stewart
Gerhard H Lengeling
Original Assignee
Apple Computer
Jeffrey C Moore
William G Stewart
Gerhard H Lengeling
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Apple Computer, Jeffrey C Moore, William G Stewart, Gerhard H Lengeling filed Critical Apple Computer
Priority to EP05758075.5A priority Critical patent/EP1769639B1/en
Priority to EP19154011.1A priority patent/EP3503540A1/en
Publication of WO2006007322A2 publication Critical patent/WO2006007322A2/en
Publication of WO2006007322A3 publication Critical patent/WO2006007322A3/en
Publication of WO2006007322B1 publication Critical patent/WO2006007322B1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/4302—Content synchronisation processes, e.g. decoder synchronisation
    • H04N21/4307—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen
    • H04N21/43076—Synchronising the rendering of multiple content streams or additional data on devices, e.g. synchronisation of audio on a mobile phone with the video output on the TV screen of the same content streams on multiple devices, e.g. when family members are watching the same movie on different devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/16—Sound input; Sound output
    • G06F3/165—Management of the audio stream, e.g. setting of volume, audio stream path
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/16—Sound input; Sound output
    • G06F3/162—Interface to dedicated audio devices, e.g. audio drivers, interface to CODECs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G11B20/10527—Audio or video recording; Data buffering arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/414—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance
    • H04N21/4143—Specialised client platforms, e.g. receiver in car or embedded in a mobile appliance embedded in a Personal Computer [PC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/44004—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video buffer management, e.g. video decoder buffer or video display buffer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/80—Generation or processing of content or additional data by content creator independently of the distribution process; Content per se
    • H04N21/81—Monomedia components thereof
    • H04N21/8106—Monomedia components thereof involving special audio data, e.g. different tracks for different languages
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements

Abstract

A system communicates with an aggregate device that includes multiple devices. When providing to-be-communicated information for playback, the system compensates for presentation latency differences between the various devices. In addition, the system adjusts for device clock drift by selecting a master device and resampling the to-be-communicated information provided to the other devices based on the difference between the device clock of the master device and the device clocks of the other devices.

Claims

AMENDED CLAIMS[received by the International Bureau on 12 May 2006 (12.05.06); original claims 2, 5, 8, 12, and 21 amended; remaining claims unchanged (10 pages)]+ STATEMENT
1. (original) A method of handling to-be-communicated information, the method comprising: placing to-be-communicated information into each of a plurality of buffers for synchronized consumption by a plurality of devices ; wherein each device of the plurality of devices consumes to-b e-eommunicated information from a corresponding buffer of the plurality of buffers; and determining where to place to-be-communicated information within a particular buffer of the plurality of buffers based, at least in part, on presentation latency of a device that corresponds to a different buffer of the plurality of buffers.
2. (currently amended) The method of Claim [[2]] 1 further comprising: allocating the plurality of ring buffers for the plurality of devices, including a first ring buffer for a first device and a second ring buffer for a second device; writing to-be-communicated information, for synchronized playback on each of the plurality of devices, into each of the plurality of ring buffers; upon reaching the end of any ring buffer while writing to-be-communicated information to the ring buffer, performing a wrap-around operation to continue writing the to-be-communicated information, beginning at the start of the ring buffer; upon reaching the end of any ring buffer while reading to-be-communicated information from the ring buffer, the corresponding device performing a wrap-around operation to continue reading the to-be-communicated information beginnhig at the start of the ring buffer; the first device currently reading to-be-communicated information from a first current position in the first ring buffer; the second device currently reading to-be-communicated information from a second current position in the second ring buffer; and wherein writing the to-be-communicated information includes selecting how far ahead of the first current position to write to-be-communicated information in the first ring buffer based, at least in part, on latency between when the second device reads data from the second ring buffer and when the second device plays the to-be-communicated information.
3. (original) The method of Claim 2 further comprising: storing first timestamp information when the first device performs a wrap-around operation while reading to-bo-communicated information from the first ring buffer; and storing second timestamp information when the second device performs a wrap- around operation while reading to-be-communicated information from the second ring buffer.
4. (original) The method of Claim 2 wherein selecting how far ahead of said first current position to write to-be-communicated information in said first ring buffer includes: receiving first latency information from said first device; and receiving second latency information from said second device.
5. (currently amended) The method of Claim 2, further comprising: receiving first safety offset information from said first device, wherein said first safety offset information identifies a minimum amount ahead of said first current position to write to-be-communicated information in said first ring buffer; receiving second safety offset information from said second device, wherein said second safety offset information identifies a minimum amount ahead of said second current position to write to-be-communicated information in said second ring buffer; and based on said first safety offset information and said second safety offset information, selecting how far ahead of said first current position to write to-be- communicated information in said first ring buffer based on latency between when the second device reads data from the second ring buffer and when the second device plays the to-be-communicated information.
6. (original) A computer apparatus comprising: a memory; and one or more processors coupled to the memory and configured to execute one or more sequence of instructions for providing to-be-communicated information to multiple devices, wherein execution of the one or more sequences of instructions by one or more processors causes the one or more processors to perform the steps of: allocating a plurality of ring buffers for a plurality of devices, including a first ring buffer for a first device and a second ring buffer for a second device; writing to-be-cornmunicated information, for synchronized playback on each of the plurality of devices, into each of the plurality of ring buffers; upon reaching the end of any ring buffer while writing to-be-communicated information to the ring buffer, performing a wrap-around operation to continue writing the to-be-communicated information beginning at the start of the ring buffer; upon reaching the end of any ring buffer while reading to-be-communicated information from the ring buffer, the corresponding device performing a wrap-around operation to continue reading the to-be-communicated information beginning at the start of the ring buffer; the first device currently reading to-be-communicated information from a first current position in the first ring buffer; the second device currently reading to-be-communicated information from a second current position in the second ring buffer; and wherein writing the to-be-communicated information includes selecting how far ahead of the first current position to write to-be-communicated information in the first ring buffer based, at least in part, on latency between when the second device reads data from the second ring buffer and when the second device plays the to-be-communicated information.
7. (original) The computer apparatus of Claim 6 further comprising the steps of: storing first timestamp information when the first device performs a wrap-around operation while reading to-be-communicated information from the first ring buffer; and storing second timestamp information when the second device performs a wrap- around operation while reading to-be-communicated information from the second ring buffer.
8. (currently amended) The computer apparatus of Claim 6 wherein selecting how far ahead of said first current position to write to-be-communicated information in said first ring buffer includes: receiving first latency information from said first device; and receiving second latency information from said second device[[;]].
9. (original) The computer apparatus of Claim 6, further comprising instructions for providing to-be-communicated information to multiple devices, which rastructions, when executed by one or more processors, cause the one or more processors to carry out the steps of: receiving first safety offset information from said first device, wherein said first safety offset information identifies a minimum amount ahead of said first current position to write to-be-communicated information in said first ring buffer; receiving second safety offset information from said second device, wherein said second safety offset information identifies a minimum amount ahead of said second current position to write to-be-communicated information in said second ring buffer; and, based on said first safely offset information and said second safety offset information, selecting how far ahead of said first current position to write to-be- communicated information in said first ring buffer based on latency between when the second device reads data from the second ring buffer and when the second device plays the to-be-communicated information.
10. (original) A method of handling to-be-communicated information, the method comprising: placing to-be-communicated information into each of a plurality of buffers for synchronized consumption by a plurality of devices; wherein each device of the plurality of devices consumes to-be-communicated information from a corresponding buffer of the plurality of buffers; and resampling the to-be-communicated information placed into a particular buffer of the plurality of buffers based, at least in part, on device clock rate difference between the device that corresponds to the buffer and one or device clock rates of one or more other devices of the plurality of devices.
11. (original) The method of Claim 10, further comprising: allocating the plurality of ring buffers for the plurality of devices, including a first ring buffer for a first device and a second ring buffer for a second device; writing to-be-communicated information, for synchronized playback on each of the plurality of devices, into each of the plurality of ring buffers; upon reaching the end of any ring buffer while writing to-be-communicated information to the ring buffer, performing a wrap-around operation to continue writing the to-be-communicated information beginning at the start of the ring buffer; upon reaching the end of any ring buffer while reading to-be-communicated information from the ring buffer, the corresponding device performing a wrap-around operation to continue reading the to-be-communicated information beginning at the start of the ring buffer; the first device currently reading to-be-communicated information from a first current position in the first ring buffer; the second device currently reading to-be-communicated information from a second current position in the second ring buffer; storing first timestamp information when the first device performs a wrap-around operation while reading to-be-communicated information from the first buffer; storing second timestamp information when the second device performs a wrap- around operation while reading to-be-cornmunicated information from the second buffer; determining a timing difference between the first device and the second device based, at least in part, on the first timestamp information and the second timestamp information; and resampling the to-be-communicated information to be written, to the second ring buffer based on the timing difference.
12, (currently amended) The method of Claim 11, further comprising: selecting one of said first and second devices as a master device based, at least in part, on latency information received from said first and second devices: and determining a timing difference between said master device and any device of said plurality of devices; wherein, resampling the to-be-communicated information to be written to any buffer of said plurality of buffers for a plurality of devices is based on said timing difference,
13. (original) The method of Claim 11, wherein resampling the to-be-communicated information to be written to said second ring buffer based on said timing difference further comprises increasing the rate at which to-be-communicated information is written to said second ring buffer.
14, (original) The method of Claim 11 , wherein resampling the to-be-communicated information to be written to said second ring buffer based on said timing difference further comprises decreasing the rate at which to-be-communicated information is written to said second ring buffer.
15. (original) A method of handling to-be-communicated information, the method comprising: using a single thread of execution to place to-be-communicated information into each of a plurality of ring buffers for synchronized consumption by a plurality of devices; and wherein each device of the plurality of devices consumes to-be-communicated information from a corresponding buffer of the plurality of buffer.
16. (original) The method of Claim 15 further comprising: allocating the plurality of ring buffers for the plurality of devices, including a first ring buffer for a first device and a second ring buffer for a second device; within a single thread of execution, writing to-be-communicated information, for synchronized playback on each of the plurality of devices, into each of the plurality of ring buffers; upon reaching the end of any ring buffer while writing to-be-comrαunicated information to the ring buffer, performing a wrap-around operation to continue writing the to-be-communicated information beginning at the start of the ring buffer; upon reaching the end of any ring buffer while reading to-be-communicated information from the ring buffer, the corresponding device performing a wrap-around operation to continue reading the to-be-communicated information beginning at the start of the ring buffer; storing first timestamp information when the first device performs a wrap-around operation while reading to-be-communicated information from the first buffer; storing second timestamp information when the second device performs a wrap- around operation while reading to-be-communicated information from the second buffer; within the single thread of execution, determining where to insert to-be- communicated information into the first ring buffer based on the first timestamp information; and within the single thread of execution, determining where to insert to-be- communicated information into the second ring buffer based on the second timestamp information.
17. (original) The method of Claim 16 wherein: the single thread of execution is executing in a computer system that has a CPU clock; the step of storing first timestamp information includes storing data that indicates: (a) current time of the CPU clock; and (b) which samples of to-be-communicated information have been read by the first device.
18. (original) The method of Claim 16 wherein: the step of determining where to insert to-be-communicated information into the first ring buffer includes: based on the first timestarap information, estimating a first rate at which the first device consumes to-be-communicated information from the first ring buffer; estimating a current position of the first device based on the first rate, wherein the current position of the first device is a position within the first ring buffer from which the first device is currently reading to-be- communicated information; and determining where to insert to-be-communicated information into the first ring buffer based on the current position of the first device; and the step of determining where to insert to-be-communicated information into the second ring buffer includes: based on the second timestamp information, estimating a second rate at which the second device consumes to-be-communicated information from the second ring buffer; estimating a current position of the second device based on the second rate, wherein the current position of the second device is a position within the second ring buffer from which the second device is currently reading to-be-communicated information; and determining where to insert to-be-communicated information into the second ring buffer based on the current position of the second device.
19. (original) The method of Claim 16 wherein: the single thread of execution is one of a plurality of threads of execution that are writing to-be-communicated information, for synchronized playback on each of the plurality of devices, into each of the plurality of ring buffers; and each thread of the plurality of threads of execution performs the steps of: determining where to insert to-be-communicated information into the first ring buffer based on the first timestamp information; and determining where to insert to-be-communicated information into the second ring buffer based on the second timestamp information.
20. (original) The method of Claim 16 wherein: the plurality of ring buffers into which the single thread of execution is writing to- be-communicated information does not include a third ring buffer associated with a third device; and concurrent with the single thread of execution writing to-be-communicated information into each of the plurality of ring buffers, a second thread of execution is writing to-be-communicated information, for synchronized playback, into the third ring buffer and at least one of the plurality of ring buffers.
21. (currently amended) The method of Claim 16 further comprising: estimating a current position of the first device based on said first timestamp information, wherein the current position of the first device is a position within the first ring buffer from which the first device is currently reading to-be-communicated information; within said single thread of execution, identifying a minimum amount ahead of said current position of the first device to write to-be-communicated information in said first ring buffer; estimating a current position of the second device based on said second timestamp information, wherein the current position of the second device is a position within the second ring buffer from which the second device is currently reading to-be-communicated information; and, within said single thread of execution, identifying a minimum amount ahead of said current position of the second device to write to-be-communicated information in said second ring buffer.
22. (original) A computer-readable medium comprising one or more sequences of instructions for providing to-be-communicated information to multiple devices, which instructions, when executed by one or more processors, cause the one or more processors to carry out the steps of any one of Claims 1-5 and 10-21.
PCT/US2005/020139 2004-06-25 2005-06-08 Providing synchronized information to multiple devices WO2006007322A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP05758075.5A EP1769639B1 (en) 2004-06-25 2005-06-08 Providing synchronized information to multiple devices
EP19154011.1A EP3503540A1 (en) 2004-06-25 2005-06-08 Providing synchronized information to multiple devices

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/877,762 US7631119B2 (en) 2004-06-25 2004-06-25 Techniques for providing audio for synchronized playback by multiple devices
US10/877,762 2004-06-25

Publications (3)

Publication Number Publication Date
WO2006007322A2 WO2006007322A2 (en) 2006-01-19
WO2006007322A3 WO2006007322A3 (en) 2006-06-15
WO2006007322B1 true WO2006007322B1 (en) 2006-08-03

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PCT/US2005/020139 WO2006007322A2 (en) 2004-06-25 2005-06-08 Providing synchronized information to multiple devices

Country Status (3)

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US (8) US7631119B2 (en)
EP (3) EP1769639B1 (en)
WO (1) WO2006007322A2 (en)

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