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4.4. INTRODUCTION TO JPEGFILES
49
• jpegtest.c contains the test program we will use
• testbild.raw is a grayscale image in raw format.
• perfctr.c,perfctr.h This is the place to look if you want to add a new per-
formance counter
• jcdctmgr.c Contains the main computation loop and definitions of static vari-
ables. Also contains the forward_DCT function which calls the 2D DCT kernel
and does the quantization.
• jdct.c Contains the 2D DCT kernel
• jchuff.c Contains the Huffman and RLE encoder.
• webcam.c Another test application we will use
Below is a call graph of the important functions called by jpegtest:
main() (jpegtest.c)
+-- draw_image() (jpegtest.c)
+-- init_encoder() (jcdctmgr.c)
+-- encode_image() (jcdctmgr.c)
| +-- forward_DCT() (jcdctmgr.c)
| | +-- jpeg_fdct_islow() (jdct.c)
| +-- encode_mcu_huff() (jchuff.c)
| +-- emit_bits() (jchuff.c)
+-- finish_pass_huff (jchuff.c)
• encode_image() - Creates a buffer for an 8 × 8 block and calls forward_dct(8x8
buffer), the returned buffer is sent to encode_mcu_huff(8x8 buffer). This will
encode the first block of the image and save it in memory. The procedure is
then repeated until every block is encoded and then finish_pass_huff() is called
to write the memory buffer to file.
• forward_dct() - Extracts the first 8 × 8 block from the image and then runs the
DCT on this block. The result is returned to encode_image().
• encode_mcu_huff() - Uses a predefined Huffman code to compress the data re-
turned from forward_dct() and sends the Huffman codes to emit_bits().
• emit_bits() - Recieves Huffman codes and save them until enough bits to write a
byte are received, then a byte is written to buffer[].
• buffer[] - Storage for the encoded image memory during operation.
• finish_pass_huff() - Calls emit_bits() to write leftover bits to buffer[] and then
calls write_data().
• write_data() - Writes the contents of buffer[] to file.
Preparation task 8
Take a look at the file containing the 2D DCT kernel and figure out how to change it
to use your 2D DCT hardware.
- Laboratory manual for TSEA44 1
- Contents 3
- CONTENTS 4
- The system 7
- 1.2 Hardware 8
- 1.2. HARDWARE 9
- 1.2.3 Virtex-II 4000 FPGA 10
- 1.3 Open RISC 11
- CHAPTER 1. THE SYST EM 12
- 1.3.3 OR1200 CPU 13
- 1.3.5 Memory Controller 15
- 1.3.6 Ethernet Controller 15
- 1.4 Software 16
- 1.4. SOFTWARE 17
- 1.4.4 µClinux 20
- Lab task 0 - Build a UART in 23
- 2.2.2 The hardware 24
- 2.2.3 A simple testbench 24
- 2.2. A SIMPLE UART 25
- 2.3 Exercises 26
- Preparation task 1 26
- Laboration task 1 26
- 2.4 gtkterm usage 27
- Wishbone bus 29
- Master Slave 30
- 3.2.1 A Wishbone Interconnect 31
- 3.3 A Simple Computer 32
- Preparation task 2 33
- Preparation task 3 34
- Preparation task 4 34
- Laboration task 2 35
- 3.4 A Benchmark Program 36
- 3.4. A BENCHMARK PROGRAM 37
- Preparation task 5 38
- Laboration task 3 39
- 3.6 Useful Commands 40
- 3.7.1 A Note on Volatile 41
- Lab task 2 - Design a JPEG 43
- Preparation task 6 44
- 4.2.2 Distributed RAMs 45
- Preparation task 7 46
- Laboration task 4 47
- Laboration task 5 47
- 4.3 Introduction to µClinux 47
- Laboration task 6 47
- Laboration task 7 48
- 4.4 Introduction to jpegfiles 48
- Preparation task 8 49
- Laboration task 8 50
- Laboration task 9 50
- 4.5 Timestamps 50
- 4.6 Quantization 51
- Preparation task 9 52
- 4.7 Tips and tricks 53
- Lab task 3 55
- WAITREADY 56
- GETBLOCK 56
- WAITREADY_LAST RELEASEBUS 56
- 5.1.2 jpeg_dma.sv 56
- Preparation task 10 58
- Laboration task 10 58
- Laboration task 11 58
- Laboration task 12 58
- CHAPTER 5. LAB TASK 3 60
- Chapter 6 61
- Preparation task 11 62
- Preparation task 12 62
- 6.2 Adding a New Instruction 62
- 6.3 Proposed Architecture 63
- 6.4 Hardware Implementation 64
- 6.5 Software Implementation 65
- Laboration task 13 67
- Laboration task 14 67
- 6.7 Tips and tricks 68
- 6.9 Beyond tsea44 70
- Bibliography 71
- BIBLIOGRAPHY 72
- Open RISC Reference Platform 73
- A.2 Interrupts 74
- The Wishbone specification 75
- B.2 Interface signals 76
- −WSS−CLK_I 77
- B.5 System Verilog Interface 79
- Tips & Trix 81
- APPENDIX C. TIPS & TRIX 82
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