Information stream syntax for indicating the presence of a splice point
First Claim
1. A method for identifying one of entrance indicium and exit indicium in an MPEG-like transport packet, said entrance indicium being associated with a transport packet suitable for use as a first packet in a splicing segment, said exit indicium being associated with a transport packet suitable for use as a last packet in a splicing segment, said method comprising the steps of:
- examining a valid splice-- countdown field within a portion of a transport packet;
wherein;
said entrance indicium is identified by said splice countdown field being equal to a first value; and
said exit indicium is identified by splice countdown field being equal to a second value.
2 Assignments
0 Petitions
Accused Products
Abstract
A method and apparatus for splicing a first compressed digital information stream into a second compressed digital information stream. The first information stream includes at least one entrance indicium identifying an appropriate stream entrance point, the second information stream includes at least one exit indicium identifying an appropriate stream exit point. A controller monitors the two streams until the appropriate points are found and, in response to a control signal, splices the first stream into the second stream.
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Citations
16 Claims
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1. A method for identifying one of entrance indicium and exit indicium in an MPEG-like transport packet, said entrance indicium being associated with a transport packet suitable for use as a first packet in a splicing segment, said exit indicium being associated with a transport packet suitable for use as a last packet in a splicing segment, said method comprising the steps of:
examining a valid splice-- countdown field within a portion of a transport packet;
wherein;said entrance indicium is identified by said splice countdown field being equal to a first value; and said exit indicium is identified by splice countdown field being equal to a second value. - View Dependent Claims (2, 3, 4)
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5. A method for identifying one of entrance indicium and exit indicium in an MPEG-like transport packet, said entrance indicium being associated with a transport packet suitable for use as a first packet in a splicing segment, said exit indicium being associated with a transport packet suitable for use as a last packet in a splicing segment, said method comprising the steps of:
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examining a splice point flag within a header portion of said transport packet; and in the case of said splice point flag being set to a first value, examining a splice countdown field in said header portion of said transport packet;
wherein;said entrance indicium comprises said splice countdown field being equal to a second value; and said exit indicium comprises said splice countdown field being equal to a third value. - View Dependent Claims (6)
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7. In a system for generating an MPEG-like transport bitstream in response to one or more elementary streams, a method for including one of an entrance indicium and exit indicium in one or more MPEG-like transport packets, said entrance indicium being associated with a transport packet suitable for use as a first packet in a splicing segment, said exit indicium being associated with a transport packet suitable for use as a last packet in a splicing segment, said method comprising the steps of:
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identifying packets suitable for use as first or last packets in a splicing segment; and setting to a first value a splice point flag within a header portion of each of said identified packets to include said entrance or exit indicium; and setting to a second value a splice countdown field within said header portion of said identified packets to include said entrance indicium, and setting to a third value said splice countdown field within said header portion of identified packets to include said exit indicium. - View Dependent Claims (8, 9, 10)
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11. A method for splicing bitstreams, said bitstreams comprising a plurality of information segments representative of a sequence of information frames, said method comprising the steps of:
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monitoring a first bitstream to detect an exit indicium, said first bitstream being coupled to an output and including at least one of said exit indicium, said exit indicium indicative of an appropriate last information segment of a splicing segment; providing a second bitstream, said second bitstream including at least one entrance indicium, said entrance indicium indicative of an appropriate first information segment of a splicing segment; and coupling said second bitstream to said output in response to a control signal, a detection of said exit indicium in said first bitstream and a detection of said entrance indicium in said second bitstream;
whereinsaid exit indicium comprises a valid splice countdown field in said header portion of said information segment being set to a first value. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification