GPU Variable Bitstream Interleaving Without Metadata Overhead
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Solution Overview
Problem
Existing methods for interleaving variable bitrate streams for GPU implementations require significant metadata, leading to increased data overhead and inefficient memory access patterns.
Innovation Solution
The solution involves interleaving variable bitrate streams using cascaded dictionary and entropy encoders without additional metadata, by fusing the decoding stages to minimize GPU divergence and improve compression efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If variable bitrate streams are interleaved using traditional methods, then decoding can be performed in parallel, but significant metadata overhead is required leading to increased data overhead
Solution Approach 1:
The patent merges the bitrate information from multiple variable bitrate streams into a single interleaved stream, eliminating the need for separate metadata headers for each stream. This combining approach allows parallel decoding to proceed while significantly reducing the total metadata overhead, as the merged stream contains consolidated rate information that can be efficiently processed by decoders.
Solution Approach 2:
The interleaved stream structure serves multiple functions simultaneously: it enables parallel decoding of multiple streams while providing a unified metadata structure that reduces overhead. The single interleaved stream acts as a universal container that carries both the compressed data and consolidated rate information, eliminating the need for separate metadata structures for each individual stream.
2Reliability
If variable bitrate streams are interleaved with separate metadata, then stream information is preserved, but memory access patterns become inefficient
Solution Approach 1:
The patent segments the interleaved stream into regularly spaced blocks that can be processed in parallel by multiple decoders. This segmentation creates a structured pattern where each decoder can access its assigned portion of the stream independently, improving memory access efficiency while preserving all necessary stream information through the consolidated metadata structure.
Solution Approach 2:
The patent changes the parameter of metadata organization from separate per-stream headers to a consolidated structure within the interleaved stream. This parameter change transforms the data layout to enable more efficient memory access patterns, allowing decoders to retrieve rate information in a systematic manner rather than navigating scattered metadata structures.
3Productivity
If supercompression is applied to texture compressed data, then compression efficiency is improved, but the data requires rapid and efficient compression to perform smoothly
Solution Approach 1:
The patent applies preliminary texture compression before supercompression, pre-organizing the data into a format that is optimized for the subsequent supercompression stage. This preliminary action reduces the complexity of the data entering the supercompression algorithm, enabling faster processing while achieving higher overall compression ratios, thus resolving the speed-efficiency tradeoff.
Data Source
AI summary
Interleaving of variable bitrate streams for GPU implementations is described. An example of an apparatus includes one or more processors including a graphic processor, the graphics processor including a super-compression encoder pipeline to provide variable width interleaved coding; and memory for storage of data, wherein the graphics processor is to perform parallel dictionary encoding on a bitstream of symbols one of multiple workgroups, the workgroup to employ a plurality of encoders to generate a plurality of token-streams of variable lengths; create a histogram including at least tokens from the plurality of token-streams for the workgroup to generate an optimized entropy code; entropy code each of the plurality of token-streams for the workgroup into an encoded bitstream; and variably interleave the encoded bitstreams to generate an interleaved bitstream and bookkeep a size of the interleaved bitstream.