文件列表:

jpeg\doc (0, 2006-05-29)
jpeg\makefile_sample_jpeg (6040, 2005-09-29)
jpeg\src\arm_linux\image\jpeg\decoder\jpgdec.c (10403, 2005-09-29)
jpeg\src\arm_linux\image\jpeg\decoder (0, 2006-05-29)
jpeg\src\arm_linux\image\jpeg\encoder\jpgenc.c (15282, 2005-09-29)
jpeg\src\arm_linux\image\jpeg\encoder (0, 2006-05-29)
jpeg\src\arm_linux\image\jpeg\general\jpgmain.c (11711, 2005-09-29)
jpeg\src\arm_linux\image\jpeg\general\jpgmisc.c (18186, 2005-09-29)
jpeg\src\arm_linux\image\jpeg\general\jpgtab.c (5986, 2005-09-29)
jpeg\src\arm_linux\image\jpeg\general (0, 2006-05-29)
jpeg\src\arm_linux\image\jpeg\_include\sampjpeg.h (7494, 2005-09-29)
jpeg\src\arm_linux\image\jpeg\_include (0, 2006-05-29)
jpeg\src\arm_linux\image\jpeg (0, 2006-05-29)
jpeg\src\arm_linux\image (0, 2006-05-29)
jpeg\src\arm_linux\include\sampdefs.h (3249, 2005-09-29)
jpeg\src\arm_linux\include (0, 2006-05-29)
jpeg\src\arm_linux (0, 2006-05-29)
jpeg\src (0, 2006-05-29)
jpeg (0, 2006-05-29)

September 7, 2005 Intel(R) Integrated Performance Primitives Version 5.0 JPEG Sample Code for Linux* on Intel(R) Personal Internet Client Architecture Processors ================================================================ CONTENTS: 1. Overview 2. Package Contents 3. Directory Structure and File List 4. System Requirements 5. Installation and Build 6. Running the software 7. Intel IPP Functional Coverage 8. Key Module Descriptions 9. Known Limitations 10. Technical Support and Feedback 11. License Definition 12. Disclaimer and Legal Information ================================================================ 1. Overview The JPEG encoder/decoder sample code supports encoding and decoding JPEG pictures compatible with CCITT T.81 subsets, which only includes baseline interleave encoding and decoding. The purpose of JPEG encoder/decoder sample code is to provide an example showing how to use Intel(R) Integrated Performance Primitives (Intel(R) IPP) JPEG primitives to build up the basic tools of a JPEG encoder/decoder, such as DCT/IDCT, quantization/dequantization and huffman encoding/decoding Additional information on this software as well as other Intel(R) software performance products is available at http://developer.intel.com/software/products/. ================================================================ 2. Package Contents The JPEG encoder/decoder sample code package contains the following: * Readme file * Makefile * Sample code source files and header files ================================================================ 3. Directory Structure and File List The following files reside in these directories, where ~ is the directory chosen as the root of this sample code package: ~ Root path of Intel(R) IPP 5.0 sample code package makefile_sample_jpeg Make file for the JPEG encoder/decoder sample code ~/doc readme_jpeg.txt Readme file ~/src/arm_linux/image/jpeg/ JPEG sample code source file directory ./general/jpgmain.c Source file for JPEG main entry function ./general/jpgtab.c Source file for tables ./general/jpgmisc.c Source file for mixed functions, such as format parsing functions ./encoder/jpgenc.c Source file for JPEG encoder and encoder initialization/free functions ./decoder/jpgdec.c Source file for JPEG decoder and decoder initialization/free functions ./_include/sampjpeg.h JPEG encoder/decoder header file ~/src/include General header file directory sampdefs.h General header file ================================================================ 4. System Requirements This sample code is targeted for Intel(R) Personal Internet Client Architecture (PCA) Processors with Intel(R) Wireless MMX(TM) Technology. It requires: Hardware requirements: * Host PC: An Intel(R) Pentium(R) 4 processor 1.5 GHz, with 512 MB RAM, or greater * Target platform: platforms that support Intel PCA Processors with Intel Wireless MMX technology, such as the Intel(R) PXA27x Processor Development Kit Software requirements: * Operating system on host machine: Red Hat* Linux* Release 7.2, or higher version * Development tools: -- iwmmxt_le-gcc 3.3.1 (MontaVista), glibc 2.3.2 and binutils 2.14 20030612 -- Red Hat* RPM version 4.0.3 or higher version * Intel IPP 5.0 for Linux on Intel PCA Processors with Intel Wireless MMX Technology Image Coding Component Library ================================================================ 5. Installation and Build Extract all files in l_ipp-PCA-JPEG_*.tgz to a desired folder. Please make sure to preserve the directory structure. The files for this sample are in the ./ipp_sample/PCA/JPEG/ folder. Follow the steps below to build JPEG encoder/decoder application. Before you begin, make sure the Intel IPP 5.0 for Linux on Intel PCA Processors with Intel Wireless MMX Technology has already been installed on the same host machine. 1) Modify makefile_sample_jpeg to make sure the variable PATH_IPP_ROOT is the current Intel Integrated Performance Primitives installation path. With default settings, the variable should be: PATH_IPP_ROOT=/opt/intel/ipp/5.0/pca_wmmx Modify other toolchain paths if necessary in this make file. 2) Make the application with the command: make -f makefile_sample_jpeg. Unzip the package with the command: unzip jpegsample.zip. This step should already be done. Follow the steps below to build the JPEG encoder/decoder application. Before you begin the build, make sure the Intel Integrated Performance Primitives for the Intel(R) PXA25x and PXA26x Processors Version 5.0 (Linux) has already been installed on the same host machine. 1) Modify makefile_sample_jpeg to make sure the variable PATH_IPP_ROOT is the current Intel Integrated Performance Primitives installation path. With the default settings, the variable should be: PATH_IPP_ROOT=/opt/intel/ipp/5.0/pca_wmmx Modify other toolchain paths if necessary in this make file. 2) Make the application with the command: make -f makefile_sample_jpeg ================================================================ 6. Running the Software If successfully built, the executable is generated in the path $(PATH_USR_BIN) defined in the make file, with the default name jpeg. The command line format is: Encoder with high quality: jpeg -enc inputfile outputfile -h Encoder with low quality: jpeg -enc inputfile outputfile -l Decoder: jpeg -dec inputfile outputfile Simply type "jpeg -help" to invoke help information. ================================================================ 7. Intel IPP Functional Coverage The JPEG encoder/decoder sample demonstrates how to combine the DCT-quantization, huffman encoding, huffman decoding, dequantization-IDCT to construct the baseline JPEG encoder/decoder. Correspondingly, the sample incorporates the following Intel IPP JPEG coding domain primitives: Functional Category Primitive Name Initialization ippiDCTQuantFwdTableInit_JPEG_8u16u ippiDCTQuantInvTableInit_JPEG_8u16u ippiEncodeHuffmanSpecInit_JPEG_8u ippiDecodeHuffmanSpecInit_JPEG_8u DCT-Quantization ippiDCTQuantFwd_JPEG_16s Dequantization-IDCT ippiDCTQuantInv_JPEG_16s Huffman Encoding ippiEncodeHuffman8x8_Direct_JPEG_16s1u_C1 Huffman Decoding ippiDecodeHuffman8x8_Direct_JPEG_1u16s_C1 Color Conversion ippiBGRToYCbCr411LS_MCU_8u16s_C3P3R ippiYCbCr411ToBGRLS_MCU_16s8u_P3C3R Please refer to the Intel Integrated Performance Primitives on Intel Personal Internet Client Architecture Processors Reference Manual (Version 5.0) for the use of these primitives. Note: The Intel IPP functions used in Intel IPP 5.0 sample code is different from that used for the Intel IPP 3.0 sample code, please see section 8 for details. ================================================================ 8. Key Module Descriptions Structures: 1) jpeg_enc_state Description: jpeg encoder state structure, which contains picture attributes, including picture size and color format, tables for quantization and huffman encoding. It also contains the quality requirement indicator and DC prediction state values. 2) jpeg_dec_state Description: jpeg decoder state structure, which contains picture attributes, including picture size and color format, tables for dequantization and huffman decoding. It also contains DC prediction state values. Functions: 1) encoder_init_alloc_jpeg() Location: jpgenc.c Description: JPEG encoder initialization function. (1) Parses BMP file header. (2) Converts input data from BGR to YUV format. (3) Loads and initializes tables for quantization and huffman encoding. (4) Allocates memories for input, output, and working buffer. Calling Procedure: It's called by the main function. It calls read_bmp_file to parse BMP file header. It calls ippiDCTQuantFwdTableInit_JPEG_16u and ippiEncodeHuffmanTableInit_JPEG_8u to process the quantization and huffman encoding tables. It calls ippiBGRToYCbCr411LS_MCU_8u16s_C3P3 to convert color format from BGR to YUV411. 2) encode_jpeg() Location: jpgenc.c Description: JPEG encoder function. It encodes the input raw YUV data of a picture into a JPEG file. (1) Writes JPEG header. (2) Does the DCT-quantization. (3) Does the huffman encoding. Calling Procedure: It's called by the main function. It calls write_head_information to write the JPEG header. It calls write_sos_information to write JPEG SOS marker. It calls ippiDCTQuantFwd_JPEG_16s to do the integrated DCT-quantization. It calls ippiEncodeHuffman_Direct_JPEG_16s1u to do the huffman encoding. 3) encoder_free_jpeg() Location: jpgenc.c Description: JPEG encoder free function. (1) Frees the working buffer of the encoder state structure. (2) Frees the input, output buffer. Calling Procedure: It's called by the main function after the JPEG encoder completes successfully. 4) decoder_init_alloc_jpeg() Location: jpgdec.c Description: JPEG decoder initialization function. (1) Parses JPEG header. (2) Loads and initializes tables for dequantization and huffman decoding. (3) Allocates memories for working buffer and input, output buffer. Calling Procedure: It's called by the main function. It calls read_jpeg_header to parse the JPEG file header. It calls ippiDCTQuantInvTableInit_JPEG_16u32s and ippiDecodeHuffmanTableInit_JPEG_8u to initialize the quantization and huffman decoding table. 5) decode_jpeg Location: jpgdec.c Description: JPEG decoder function. It decodes the JPEG format stream into BGR raw data. (1) Decodes huffman encoded coefficients. (2) Does the dequantization and IDCT transform. (3) Does color conversion from YUV to BGR. Calling Procedure: It's called by the main function. It calls ippiDecodeHuffman_Direct_JPEG_1u16s to decode the huffman encoded coefficient. It calls ippiDCTQuantInv_JPEG_16s to do the dequantization-IDCT. It calls ippiYCbCr411ToBGRLS_MCU_16s8u_P3C3 to convert YUV data into BGR data. 6) decoder_free_jpeg Location: jpgdec.c Description: JPEG decoder free function. (1) Frees the working buffer of the decoder state structure. (2) Frees the input, output buffer. Calling Procedure: It's called by the main function after the JPEG decoder completes successfully. 7) read_bmp_file() Location: jpgmisc.c Description: BMP parsing function. Parses the JPEG header information. Calling Procedure: It's called by encoder_init_alloc_jpeg() to parse the BMP header. 8) write_head_information() Location: jpgmisc.c Description: JPEG header packing function. Writes and packs the information to the JPEG file header. Calling Procedure: It's called by function encode_jpeg() to pack the JPEG file header. 9) write_sos_information() Location: jpgmisc.c Description: JPEG SOS information packing function. Writes and packs the information to the JPEG SOS segment. Calling Procedure: It's called by function encode_jpeg() to pack the JPEG SOS segment. 10) read_jpeg_header Location: jpgmisc.c Description: JPEG header parsing function. Reads and parses JPEG header from the JPEG file Calling Procedure: It's called by function decoder_init_alloc_jpeg to parse the JPEG File header information. 11) read_sos Location: jpgmisc.c Description: JPEG SOS information parsing function. Parses the SOS information from the JPEG SOS segment. Calling Procedure: It's called by function decoder_init_alloc_jpeg to parse the JPEG SOS segment information. ================================================================ 9. Known Limitations None known at the time of this document release. ================================================================ 11. Technical Support and Feedback To receive support or provide feedback for AAC decoder sample code, please refer to the "Technical Support and Feedback" section of the release notes provided in the Intel IPP V5.0 for Linux on Intel PCA Processors with Intel Wireless MMX Technology product installation. ================================================================ 11. License Definition By downloading and installing this sample, you hereby agree that the accompanying Materials are being provided to you under the terms and conditions of the End User License Agreement for the Intel IPP product previously accepted by you. ================================================================ 12. 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