Racing-Mode Ring Buffer Access Control for Low-Latency Video Processing
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Solution Overview
Problem
Conventional video systems face challenges in achieving low-latency and high-performance video playback due to long playback latency in video receiving systems, which is a limitation for ultra-low latency applications such as virtual reality.
Innovation Solution
A video processing system utilizing a ring buffer and a racing-mode ring buffer access control scheme is implemented, with storage devices and processing stages configured to prevent data overflow and underflow, ensuring seamless data access and processing between stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If conventional video receiving system design is used, then system stability is maintained, but playback latency becomes too long for ultra-low latency applications
Solution Approach 1:
The video receiving system is divided into multiple independent processing stages (receiving circuit, audio/video demultiplexing circuit, video decoder, display engine), each with dedicated ring buffers. This segmentation allows parallel processing and reduces overall latency while maintaining system stability through modular design.
Solution Approach 2:
Ring buffers are pre-configured with sufficient capacity to hold video data packets before processing. The racing-mode access control scheme is pre-established to manage buffer access, allowing data to be staged and prepared in advance, reducing waiting time and latency in the video playback pipeline.
2Reliability
If buffer size is increased to prevent underflow and overflow, then data access reliability improves, but buffer cost increases
Solution Approach 1:
The racing-mode ring buffer access control scheme dynamically adjusts buffer access based on real-time read and write pointer positions. This dynamic control allows smaller buffer sizes to be used effectively, as the system adapts to varying data flow rates, preventing overflow and underflow without requiring excessive buffer capacity.
Solution Approach 2:
The access control scheme continuously monitors the positions of read and write pointers in the ring buffers, providing feedback control. When the write pointer approaches the read pointer, the system adjusts data flow to prevent overflow, and when the read pointer approaches the write pointer, it prevents underflow, ensuring reliable data access with optimized buffer sizes.
3Loss of time
If racing-mode ring buffer access control scheme is implemented, then access latency is reduced, but system complexity increases
Solution Approach 1:
The ring buffer access control scheme is designed to be self-managing through automated pointer comparison and conditional blocking. The system automatically detects when read and write pointers are in conflict and manages data flow without external intervention, reducing access latency while keeping control logic integrated within the buffer management structure rather than requiring complex external control mechanisms.
Data Source
AI summary
A video processing system includes a storage device, a receiving circuit, an audio/video demultiplexing circuit, a video decoder, and a display engine. The storage device includes a data buffer, a bitstream buffer, and a display buffer. An output of the receiving circuit is written into the data buffer. An input of the audio/video demultiplexing circuit is read from the data buffer, and an output of the audio/video demultiplexing circuit is written into the bitstream buffer. An input of the video decoder is read from the bitstream buffer, and an output of the video decoder is written into the display buffer. An input of the display engine is read from the display buffer. Each of the data buffer, the bitstream buffer, and the display buffer is a ring buffer.