An H.264/AVC Main Profile Video Decoder Accelerator in a Multimedia SOC Platform
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1 An H.264/AVC Main Profile Video Decoder Accelerator in a Multimedia SOC Platform Youn-Long Lin Department of Computer Science National Tsing Hua University Hsin-Chu, TAIWAN 300 ylin@cs.nthu.edu.tw 2006/08/16 MPSOC Colorado, USA
2 Main Points Hardwired design has excellent area, performance, power advantages If it is to be used by 1B people everyday, every bit and every cycle count It is not difficult 15 CS student-years, no background in video nor HDL-based design; neither is the professor RTL design is the easy part; Understanding algorithm and designing architecture are most critical YLLIN NTHU-CS 2
3 Video Coding Standards Standard MPEG-1 MPEG-2 MPEG-4 H.264 MB size 16*16 16*16(frame) 16*16 16*16 Block size 8*8 8*8 16*16, 8*8 16*16, 16*8, 8*16, 8*8, 8*4, 4*8, 4*4 Transform DCT DCT DCT/ Wavelet 4*4 int transform Entropy coding VLC VLC VLC VLC, CAVLC and CABAC ME, MC Yes Yes Yes 41 MVs per MB Pixel accuracy ½ pel ½ pel ¼ pel ¼ pel Reference frames One frame One frame One frame Multiple (5) frames Picture type I, P, B I, P, B I, P, B I, P, B Transmission rate Up to 1.5 Mbps 2-15 Mbps 64kbps~2Mbps 64kbps ~ 150Mbps YLLIN NTHU-CS 3
4 Get More for Less H.264 MPEG-2 YLLIN NTHU-CS 4
5 H.264/AVC Profiles Extended profile SP, SI slice Data partition B slice Weighted prediction Interlace CABAC Main profile Baseline profile Slice group ASO Redundant Slice I slice P slice CAVLC 8x8 transform Quantization matrix Color Sampling FREext (High) profile 8/10/12 bit sampling YLLIN NTHU-CS 5
6 NTHU H.264/AVC Main Profile Video Decoder Prototype Multimedia SOC Platform 10MHz Main Profile CIF(352x288)@ 30 fps 24MHz Main Profile D1 (720x480)@30fps YLLIN NTHU-CS 6
7 A Multimedia SOC Platform CPU Accelerator (FPGA) USB(PHY) Daughter Board ROM/ Flash Memory SDRAM FPGA VIC USB 2.0 Static memory SDRAM Controller(4-CH) High-Speed Bus JPEG Codec DMA PWM WDT TIMER APB Bridge Capture Display Controller Peripheral Bus DAI SSI SD SM UART GPIO 12C Audio Codec I2S Flash memory with SSI Video-In Flash Card Button LED CCIR601 TV/LCD YLLIN NTHU-CS 7
8 H.264/AVC Decoder System Diagram ARM926EJS TV Master Timer Slave SD Card Slave UART Slave AHB1 Slave H264 Master Slave SDC Slave Slave SDC Slave SDRAM LM SDRAM AHB2 YLLIN NTHU-CS 8
9 H.264/AVC Decoder Architecture SD Card SDRAM CPU Storage Device Input/Ref./Display Frame Display AHB MV Parser Para MC Ref idx reconstruct CABAD MBinfo Intra pred Pred Pic Rec unfilter DF CAVLD Coeff IQ/IDCT Residual DECODER YLLIN NTHU-CS 9
10 Hierarchical FSM in Main Controller Frame Level MB Level CABAC FSM CABAC MC FSM MC rden rd_addr rd_data Type decoder Main FSM IPRED FSM IQ/IDCT FSM IPRED IQ/IDCT PICREC FSM PICREC Main controller DF FSM DF YLLIN NTHU-CS 10
11 AMBA interface AHB A slave wrapper LM control register H.264 Decoder MFU VLC & TV OUT DF & MC arbiter 1 arbiter 2 SDC master wrapper 1 master wrapper 2 YLLIN NTHU-CS AHB B 11
12 Our Design Flow Software spec. in C & Acceleration specify User Spec. SW lib. C models, drivers API Platform spec. Embedded Software Compilation System.h Acceleration System configuration System description Co-Sim Evaluation No Software image HW/SW co-simulation Area & Timing & Power evaluation Performance constraint Yes FPGA prototyping Acceleration HW lib. HDL IPs Platform model Hardware image System Integrate HW IP Synthesizer Accelerator.v System generation System.v Integration Pin assignment & Hardware compilation Parameterized ISS FPGA Verify YLLIN NTHU-CS 12
13 Memory Traffic Consideration One SDRAM for All External Storage SDRAM Burst Mode Internal Storage for Compact Access & Data Reuse SDRAM Encoded Bitstream Reference Frames Currently Reconstructed Frame Display Buffer YLLIN NTHU-CS 13
14 Buffer Size vs Bus Traffic Frame per Sec MHz/TV 16MHz/LCD 24MHz/TV 24MHz/LCD Buffer Size YLLIN NTHU-CS 14
15 Performance Comparison DSP Core HW Accelerated Gate Count 230K 180K 180K MHz Profile Baseline Main Main Resolution QCIF (176x144) CIF (352x288) D1 (720x480) Frame Rate YLLIN NTHU-CS 15
16 Summary An H.264/AVC main profile decoder on an ad hoc multimedia SOC platform Hardware-accelerated approach is highperformance and energy-efficient Memory traffic has major impact on performance It is not as difficult as you may think; algorithm and architecture are critical; writing Verilog is no difference from writing C Do not try to parallelize Reference Software; it is just proof of concept; not an implementation YLLIN NTHU-CS 16
17 Demo Video YLLIN NTHU-CS 17
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