| 摘要 |
Apparatus for processing a compressed input bitstream representing an information signal. The apparatus processes the compressed input bitstream in a way that changes the information signal represented by the compressed input bitstream, and comprises a layered decoder that decodes the compressed input bitstream to provide a decoded bitstream, a decoded bitstream processor that processes the decoded bitstream to provide a modified bitstream, a layered encoder that re-encodes the modified bitstream to provide a compressed output bitstream, and a selective interconnection path. The layered decoder includes serially-connected decoding modules. The decoded bitstream processor processes the decoded bitstream in a way that modifies the information signal. The layered encoder includes serially-connected encoding modules, each of which corresponds to one of the decoding modules in the layered decoder. The selective interconnection path selectively connects the output of one of the decoding modules to the input of the decoded bitstream processor and selectively connects the output of the decoded bitstream processor to the input of the one of the encoding modules corresponding to the one of the decoding modules. The layered decoder may include an element that derives bitstream parameters from the compressed input bitstream, and the apparatus may additionally comprise a bitstream parameter forwarding path that interconnects the layered decoder to the layered encoder. At least one of the encoding modules may be connected to the parameter forwarding path and may perform an encoding operation using the bitstream parameters derived from the compressed input bitstream.
|
