SPRADE7 November   2023 AM62A3 , AM62A3-Q1 , AM62A7 , AM62A7-Q1 , AM62P-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2AM62A Processor
  6. 3AM62A Video Processing Unit (VPU) Capability
  7. 4AM62A JPEG Encode Capability
    1. 4.1 Open Source GStreamer Overview
    2. 4.2 TI-Provided V4L2 Drivers for Multimedia
    3. 4.3 Hardware-Accelerated GStreamer Plugins
  8. 5Software Driver Architecture
  9. 6Performance Measurements
  10. 7Multimedia Use Cases
    1. 7.1 Smart AI Box
    2. 7.2 Surveillance
  11. 8Summary
  12. 9References

4 AM62A JPEG Encode Capability

The JPEG hardware IP block in AM62A is a stateful and scalable performance still image encoder. It is capable of real time encoding of YUV420/YUV422 raw picture data to fully compressed image (jpeg) or a sequence of compressed images (MJPEG).

Table 4-1 illustrates some of the high-level specifications of the MJPEG encoder.

Table 4-1 JPEG Specifications
Maximum Resolution 8k x 8k
Clock Rate 250MHz
Encode Rate 4bytes/cycle (2pixels/cycle in YUV422, 2.66 pixels/cycle in YUV420)
Feature Support JPEG baseline profile
Configuration compression ratio
Two Quantization tables

Table 4-2 lists the theoretical throughput. Measured throughput is typically around the 80% mark and for YUV 4:2:2 format this was measured to be 416MP/s.

Table 4-2 Theoretical Throughput for the JPEG Encoder
Color Subsampling Throughput
YUV 4:2:0 250x2.66= 666 MP/s
YUV 4:2:2 250x2 = 500MP/s

The hardware and software latency (which considers generating headers, bitstream) for JPEG encoding a single stream 1080P@30FPS is measured to be ~8.04 ms.

Detailed information on the JPEG encoder can be found in [6].