JPEG Decoder, Blackfin
JPEG Decoder, Blackfin
The JPEG (Joint Photographic Experts Group) Decoder library for the Blackfin processor is fully compliant with ISO/IEC 10918-1:1993 (ITU-T T.81) and can be used to build a Motion-JPEG video system, for example using the AVI file format.
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Overview
Features and Benefits
- Target Processor: Code compatible across the Blackfin ADSP-BF5xx and ADSP-BF6xx processor Family
- Release format: Object code module with C source wrapper
- Input format: JPEG bit streams encoded using Baseline, Extended Sequential DCT Process (Huffman coding), or Progressive DCT Process (Huffman coding)
- Supported Transport Formats: A separate sub-module is required to demux JPEG frames from a transport stream. Example source code is available for M-JPEG AVI
- Supported Meta-data File Formats: A separate sub-module is required to parse meta-data from a JPEG bit stream. Example source code is available for EXIF, JFIF, and Adobe®
- Output format: RGB, YUV 4:4:4, YUV 4:2:2, rotated YUV 4:2:2, YUV 4:2:0, or Y-only (YUV 4:0:0 / monochrome)
- Output data resolution: 8 bits
- Framework dependencies: None
- Multi-threading: Fully re-entrant and multi-instancing capable
- Compliant with ISO/IEC 10918-1:1993 (ITU-T T.81)
- Rigorous interoperability testing across many commercially available platforms and open source viewers/applications
Product Details
JPEG is the image compression standard developed by the Joint Photographic Experts Group. It works best on natural images (scenes).The JPEG decoder has been highly optimized to run on the Analog Devices' Blackfin® processor family. It is a self-contained software module that is fully compliant with ISO/IEC 10918-1:1993 (ITU-T T.81). This software has undergone rigorous interoperability testing across many commercially available platforms, and open source applications. This module can be used to build a Motion-JPEG video system, for example using the AVI file format.
The module uses a C-callable API that includes a number of system interface hooks via user call-back functions. This allows better customization and optimization of data input/output integration, and meta-data processing (for example EXIF). The code has no dependencies on processor peripherals or registers, adding greater system flexibility and ease of use.
Licensing
Each module supports the Analog Devices, Inc. (ADI) Blackfin or SHARC Processor family and is a licensed product that is available in object code format. Recipients must sign or accept a license agreement with ADI prior to being shipped or downloading the modules identified in the license agreement.
Performance Metrics
MIPS/Memory summary table:
| Average Cycles |
|||||
| Blackfin Processor |
Code RAM (KiB) |
Data RAM (KiB) |
Constant Data Tables (KiB) |
Total Cycles (x106) |
Cycles/pixel |
| ADSP-BF533 |
19.9 | 1.2 | 0.9 | 12.2 | 46.5 |
| ADSP-BF609 |
11.1 | 42.5 | |||
- This table highlights example Blackfin processors and average cycle counts. The ADSP-BF609 processor includes additional L2 on-chip memory which can help reduce cycles when fully utilized. Similarly, processors with higher bandwidth external memory interfaces (32-bit versus 16-bit, and DDR versus SDRAM) will also help reduce overall cycle requirements.
- Cycles measured using a compressed Mandrill 512x512 YUV420 image encoded in sequential mode, compression rate 1.8 bits per pixel (compression ratio 14.2), running on BF533/BF609 with optimum memory layout.
- BF533 Core Clock = 594 MHz, System Clock = 118 MHz; BF609 Core Clock = 500 MHz, System Clock = 250 MHz, Dynamic Mem Clock = 250 MHz.
- Code compatible across all Blackfin processors, with silicon anomaly workarounds implemented.
- "Data RAM" for one instance, includes scratch buffer and stack, and minimum heap memory.
- 1 KiB = 1024 Bytes.
Systems Requirements
- Windows XP Professional SP3 (32-bit only)
- Windows Vista Business/Enterprise/Ultimate SP2 (32-bit only). It is recommended to install the software in a non-UAC-protected location.
- Windows 7 Professional/Enterprise/Ultimate (32 and 64-bit). It is recommended to install the software in a non-UAC-protected location.
- Windows 8 Professional/Enterprise (32 and 64-bit). It is recommended to install the software in a non-UAC-protected location.
- Minimum of 2 GHz single core processor, 3.3 GHz dual core is recommended.
- Minimum of 1 GB memory (RAM), 4 GB is recommended.
- Minimum of 2 GB hard disk (HDD) space is required.
- CrossCore Embedded Studio for Analog Devices Processors.
- VisualDSP++ 5.1 for Analog Devices with the latest update.