Multistandard video decoder and decompression system for processing encoded bit streams including a standard-independent stage and methods relating thereto
A pipeline video decoder and decompression system handles a plurality of separately encoded bit streams arranged as a single serial bit stream of digital bits and having separately encoded pairs of control codes and corresponding data carried in the serial bit stream. The pipeline system employs a plurality of interconnected stages to decode and decompress the single bit stream, including a start code detector. When in a search mode, the start code detector searches for a specific start code corresponding to one of multiple compression standards. The start code detector responding to the single serial bit stream generates control tokens and data tokens. A respective one of the tokens includes a plurality of data words. Each data word has an extension bit which indicates a presence of additional words therein. The data words are thereby unlimited in number. A token decode circuit positioned in certain of the stages recognizes certain of the tokens as control tokens pertinent to that stage and passes unrecognized control tokens to a succeeding stage. A reconfigurable decode and parser processing means positioned in certain of the stages is responsive to a recognized control token and reconfigures a particular stage to handle an identified data token. Methods relating to the decoder and decompression system include processing steps relating thereto.
1. A multi-standard decoder for decoding data streams comprising:
processing stages interconnected to form a pipeline and for processing tokens derived from one or more of the data streams, the processing stages including standard-independent and standard-dependent processing stages, the standard-dependent processing stages capable of reconfiguration to operate in accordance with different data encoding standards; and
wherein the tokens provide reconfiguration information to the standard-dependent processing stages at an intermediate stage between an original stage and a final stage.
2. The multi-standard decoder of claim 1 , wherein each of the tokens includes an extension indicator that indicates whether additional words are present.
3. The multi-standard decoder of claim 1 , wherein one of the standard-dependent processing stages comprises an inverse quantizer.
4. The multi-standard decoder of claim 3 , wherein one of the tokens comprises a first QUANT_TABLE token.
5. The multi-standard decoder of claim 4 , wherein the inverse quantizer recognizes the first QUANT_TABLE token and, responsive to a first state of the extension indicator in a first word of the first QUANT_TABLE token, generates a second QUANT_TABLE token to be conveyed to another of the processing stages.
6. The multi-standard decoder of claim 5 , wherein the second QUANT_TABLE token includes quantization table values.
7. The multi-standard decoder of claim 4 , wherein responsive to a second state of the extension indicator of the first word of the QUANT_TABLE token, the inverse quantizer installs a quantization table of the first QUANT_TABLE token in a memory.
8. A method of decoding data streams of data encoded by different standards comprising:
receiving tokens at a standard-dependent processor, the standard-dependent processor capable of reconfiguration of a multi-state pipeline to operate in accordance with the different standards; and
reconfiguring for standard-dependent processing in response to the received tokens at an intermediate state between an original stage and a final stage of said multi-stage pipeline.
9. The method of claim 8 , wherein each token includes an extension indicator that indicates whether additional words are present and has a first and a second state to indicate reconfiguration information.
10. The method of claim 8 , wherein one of the conveyed tokens is a first QUANT_TABLE token, and further comprising:
recognizing the first QUANT_TABLE token; and
responsive to the first state of the extension indicator in a first word of the first QUANT_TABLE token, generating a second QUANT_TABLE token to be conveyed to another processor.
11. The method of claim 7 , wherein the second QUANT_TABLE token includes quantization table values to be used by the another processor.
12. The method of claim 9 , further comprising:
responsive to a second state of the extension indicator of the first word of the QUANT_TABLE token, installing a quantization table of the first QUANT_TABLE token in memory.
13. A system comprising:
processing stages including standard-independent and standard-dependent processing stages, the standard-dependent processing stages capable of reconfiguration to operate in accordance with different data encoding standards; and
tokens for interacting with the processing stages, the tokens providing reconfiguration information to the standard-dependent processing stages to cause the standard-dependent processing stages to reconfigure stages at an intermediate stage between an original stage and a final stage.