Apparatus and method for providing multiple video data streams from a single source
First Claim
1. A method of generating a composite video data stream comprising the steps of:
- receiving a first data stream composed of a sequence of frames of video data each having an x-dimension of a preselected number of pixels and a y-dimension of a preselected number of pixels;
receiving a second data stream composed of a sequence of frames of video data each having an x-dimension of a preselected number of pixels and a y-dimension of a preselected number of pixels;
downscaling the x and y dimensions of the frames of the first data stream to produce a sequence of first blocks of pixels;
downscaling the x and y dimensions of the frames of the second data stream to produce a sequence of first blocks of pixels;
writing the first blocks into a first object buffer associated with a first memory space during first and third ones of four processing phases;
storing the second blocks of data into a second object buffer associated with a second memory space during first, second, third and fourth ones of the four processing phases;
retrieving a pair of blocks each composed of one of the first and one of the second blocks out of a third object buffer associated with both the first and second memory spaces during ones of the first, second, third and fourth processing phases; and
outputting each pair of blocks as a field of the composite video data stream.
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Accused Products
Abstract
A method is provided for generating a composite video data stream. A first data stream composed of a sequence of frames of video data each having an x-dimension of a preselected number of pixels and a y-dimension of a preselected number of pixels is received. A second data stream composed of a sequence of frames of video data each having a x-dimension of a preselected number of pixels and a y-dimension of a preselected number of pixels is also received. The x- and y-dimensions of the frames of the first data stream are downscaled to produce a sequence of first blocks of pixels. The x- and y-dimensions of the frames of the second data stream are downscaled to produce a sequence of second blocks of pixels. The first blocks are written into a first object buffer associated with a first memory space during first and third ones of four processing phases using a set of counters associated with the first object buffer. The second blocks of data are stored in a second object buffer associated with a second memory space during first, second, third and fourth ones of the four processing phases using a set of counters associated with the second object buffer. A pair of blocks each composed of one of the first and one of the second blocks are retrieved out of a third object buffer associated with both the first and second memory spaces during ones of the first, second, third and fourth processing phases using a set of counters associated with the third object buffer. Each pair of blocks are then output as a field of the composite video data stream.
28 Citations
9 Claims
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1. A method of generating a composite video data stream comprising the steps of:
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receiving a first data stream composed of a sequence of frames of video data each having an x-dimension of a preselected number of pixels and a y-dimension of a preselected number of pixels; receiving a second data stream composed of a sequence of frames of video data each having an x-dimension of a preselected number of pixels and a y-dimension of a preselected number of pixels; downscaling the x and y dimensions of the frames of the first data stream to produce a sequence of first blocks of pixels; downscaling the x and y dimensions of the frames of the second data stream to produce a sequence of first blocks of pixels; writing the first blocks into a first object buffer associated with a first memory space during first and third ones of four processing phases; storing the second blocks of data into a second object buffer associated with a second memory space during first, second, third and fourth ones of the four processing phases; retrieving a pair of blocks each composed of one of the first and one of the second blocks out of a third object buffer associated with both the first and second memory spaces during ones of the first, second, third and fourth processing phases; and outputting each pair of blocks as a field of the composite video data stream. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification
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- Resources
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Current AssigneeNVIDIA Corporation
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Original AssigneeCirrus Logic Incorporated
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InventorsXu, Frank, Nally, Robert M.
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Primary Examiner(s)Metjahic, Safet
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Assistant Examiner(s)MURRELL, JEFFREY S
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Application NumberUS08/474,262Time in Patent Office426 DaysField of Search348/715, 348/719, 348/720, 348/385, 348/387, 358/313, 360/11.1US Class Current348/386.1CPC Class CodesH04N 5/9205 the additional signal being...H04N 7/0806 the signals being two or mo...
