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Description: 该目录下包含了实施ISO/IEC DIS 13818-2标准的源程序。它可以将为压缩的图像 转化成MPEG-1和MPEG-2视频编码流，同时也可以进行逆变换。 doc/目录下的mpeg2enc.doc和mpeg2dec.doc文件包含了关于解码器的进一步的信 息。verify/目录下是一组用来进行验证的图像和小的数据流，以及用来自动检测编码 器和解码器输出的Unix shell脚本文件。 在src/目录下有两个子目录mpeg2enc/和mpeg2dec/，其中包含了编码器和解码器 的源代码，以及在VC下编译过的可执行程序。par/目录下给出了一组可在每秒25和30帧 的速率下进行MPEG-2和MPEG-1编码的编码器参数文件。 可以在标准的C编译器中，编译makefile文件来运行该程序。 在bin/目录下，给出了该文件的可执行程序。 在mpeg2ply/目录下包含了一个用来播放mpeg1和mpeg2视频流的windows可执行程序。-this directory contains the implementation of the ISO / IEC DIS 13818-2 standards of the source. It will be compressed images into MPEG-1 and MPEG-2 video encoding flow, but also for inverse transform. Doc / directory and the mpeg2enc.doc mpeg2dec.doc document contains decoders for further information. Verify / directory is a group used for the certification of small images and data flow, and used to automatically detect encoder and decoder output of the Unix shell script file. In src / directory there are two subdirectories mpeg2enc and / mpeg2dec /, which includes the encoder and decoder source code, and the VC compiled executable programs. Par / directory is given in a second group of 25 and 30 under the rate of MPEG-2 and MPEG-1 encoding of the document encoding parameters. The standar
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Size: 603236 |
Author: 万祥兵 |
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Description: MPEG第2層和第3層基于ISO 或者MPEG 音頻的譯碼器源碼的音頻的譯碼器或者播放器，帶有速度最優化 -MPEG Layer 2 and Layer 3 or based on the ISO MPEG audio decoder source audio decoder, or players, with speed optimization
Platform: |
Size: 91540 |
Author: 蔡智傑 |
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Description: Mpeg的來源音頻的編碼器和譯碼器負責MPEG的ISO 組分發的1，2個第1，2，3層 -Mpeg the source audio encoder and decoder for MPEG ISO group distributed 1,2-layer 1, 2, 3
Platform: |
Size: 554131 |
Author: 蔡智傑 |
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Description: Sklmp4 consists in portable C++ sources of a library capable of encoding
and decoding MPEG-4 video bitstream. Bitstreams conforming to ISO/IEC 14496-2
(version 2) Advance Simple Profile are fully supported by the
decoder. Partial support for MPEG-1/2 bitstreams (ISO/IEC 13818-2)
is also supplied.-Sklmp4 consists in portable C sources of a l ibrary capable of encoding and decoding MPEG-4 video bitstream. Bitstreams conforming to ISO / IEC 14496-2 (version 2) Advance Simple Profil e are fully supported by the decoder. Partial su 17 for MPEG-1 / 2 bitstreams (ISO / IEC 13818 - 2) is also supplied.
Platform: |
Size: 487778 |
Author: eckuk |
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Description: MPEG-4的解码器。 This MoMuSys implementation of MPEG-4 was originally
developed in the course of development of the MPEG-4 Video
(ISO/IEC 14496-2) standard. This software module is an
implementation of a part of one or more MPEG-4 Video
(ISO/IEC 14496-2) tools as specified by the MPEG-4 Video
(ISO/IEC 14496-2) standard.-MPEG-4 decoder. This MoMuSys implementation of the MPEG-4 was orig inally developed in the course of development o f the MPEG-4 Video (ISO / IEC 14496-2) standard. This software module is an implementation of a p art of one or more MPEG-4 Video (ISO / IEC 14496-2 ) tools as specified by the MPEG-4 Video (ISO / IE C 14496-2) standard.
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Size: 132816 |
Author: 凌波 |
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Description: Jbig2解码代码包。包中有样例程序。
jbig2dec is a decoder library and example utility implementing the JBIG2
bi-level image compression spec. Also known as ITU T.88 and ISO IEC
14492, and now included by reference in Adobe s PDF 1.4.
Platform: |
Size: 123229 |
Author: shihong |
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Description: iso standard source code including encoder and decoder.
Platform: |
Size: 1879437 |
Author: zhaozhendong |
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Description: ISO mp3 sources (distribution 10)
Layer 1/2/3, C Source, 512 k
Sources of the Mpeg 1,2 layer 1,2,3 audio encoder and decoder distributed by the ISO group in charge of the MPEG.
Platform: |
Size: 590575 |
Author: Eddy |
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Description: It s a JPEG decoder and need a lot of promotion and correction,This distribution contains the sixth public release of the Independent JPEG
Group s free JPEG software. You are welcome to redistribute this software and
to use it for any purpose, subject to the conditions under LEGAL ISSUES, below.
Serious users of this software (particularly those incorporating it into
larger programs) should contact IJG at jpeg-info@uunet.uu.net to be added to
our electronic mailing list. Mailing list members are notified of updates
and have a chance to participate in technical discussions, etc.
This software is the work of Tom Lane, Philip Gladstone, Jim Boucher,
Lee Crocker, Julian Minguillon, Luis Ortiz, George Phillips, Davide Rossi,
Guido Vollbeding, Ge Weijers, and other members of the Independent JPEG
Group.
IJG is not affiliated with the official ISO JPEG standards committee.
Platform: |
Size: 647354 |
Author: Ken |
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Description: 该目录下包含了实施ISO/IEC DIS 13818-2标准的源程序。它可以将为压缩的图像转化成MPEG-1和MPEG-2视频编码流，同时也可以进行逆变换。doc/目录下的mpeg2enc.doc和mpeg2dec.doc文件包含了关于解码器的进一步的信息。verify/目录下是一组用来进行验证的图像和小的数据流，以及用来自动检测编码器和解码器输出的Unix shell脚本文件。 在src/目录下有两个子目录mpeg2enc/和mpeg2dec/，其中包含了编码器和解码器的源代码，以及在VC下编译过的可执行程序。par/目录下给出了一组可在每秒25和30帧的速率下进行MPEG-2和MPEG-1编码的编码器参数文件。可以在标准的C编译器中，编译makefile文件来运行该程序。在bin/目录下，给出了该文件的可执行程序。 在mpeg2ply/目录下包含了一个用来播放mpeg1和mpeg2视频流的windows可执行程序。-this directory contains the implementation of the ISO / IEC DIS 13818-2 standards of the source. It will be compressed images into MPEG-1 and MPEG-2 video encoding flow, but also for inverse transform. Doc / directory and the mpeg2enc.doc mpeg2dec.doc document contains decoders for further information. Verify / directory is a group used for the certification of small images and data flow, and used to automatically detect encoder and decoder output of the Unix shell script file. In src / directory there are two subdirectories mpeg2enc and / mpeg2dec /, which includes the encoder and decoder source code, and the VC compiled executable programs. Par / directory is given in a second group of 25 and 30 under the rate of MPEG-2 and MPEG-1 encoding of the document encoding parameters. The standar
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Size: 604185 |
Author: 邓志国 |
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Description: 一系列缓冲区类支撑起了 Java 2 平台标准版的新 I/O（NIO）包。这些类的数据容器形成了其它 NIO 操作（如套接字通道上的非阻塞读取）的基础。在本月的 Merlin 的魔力中，常驻 Java 编程专家 John Zukowski 展示了如何操作那些数据缓冲区来执行如读／写原语这样的任务以及如何使用内存映射文件。在以后的文章里，他将把这里所提到的概念扩展到套接字通道的使用。 Java 2 平台标准版（Java 2 Platform Standard Edition，J2SE）1.4 对 Java 平台的 I/O 处理能力做了大量更改。它不仅用流到流的链接方式继续支持以前 J2SE 发行版的基于流的 I/O 操作，而且 Merlin 还添加了新的功能 — 称之为新 I/O 类（NIO），现在这些类位于 java.nio 包中。
I/O 执行输入和输出操作，将数据从文件或系统控制台等传送至或传送出应用程序。（有关 Java I/O 的其它信息，请参阅 参考资料）。
缓冲区基础
抽象的 Buffer 类是 java.nio 包支持缓冲区的基础。 Buffer的工作方式就象内存中用于读写基本数据类型的 RandomAccessFile 。象 RandomAccessFile一样，使用 Buffer ，所执行的下一个操作（读／写）在当前某个位置发生。执行这两个操作中的任一个都会改变那个位置，所以在写操作之后进行读操作不会读到刚才所写的内容，而会读到刚才所写内容之后的数据。 Buffer 提供了四个指示方法，用于访问线性结构（从最高值到最低值）：
"capacity() ：表明缓冲区的大小
"limit() ：告诉您到目前为止已经往缓冲区填了多少字节，或者让您用 :limit(int newLimit) 来改变这个限制
"position() ：告诉您当前的位置，以执行下一个读／写操作
"mark() ：为了稍后用 reset() 进行重新设置而记住某个位置
缓冲区的基本操作是 get() 和 put() ；然而，这些方法在子类中都是针对每种数据类型的特定方法。为了说明这一情况，让我们研究一个简单示例，该示例演示了从同一个缓冲区读和写一个字符。在清单 1 中， flip() 方法交换限制和位置，然后将位置置为 0，并废弃标记，让您读刚才所写的数据：
清单 1. 读／写示例
import java.nio.*;
...
CharBuffer buff = ...;
buff.put('A');
buff.flip();
char c = buff.get();
System.out.println("An A: " + c);
现在让我们研究一些具体的 Buffer 子类。
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缓冲区类型
Merlin 具有 7 种特定的 Buffer 类型，每种类型对应着一个基本数据类型（不包括 boolean）：
"ByteBuffer
"CharBuffer
"DoubleBuffer
"FloatBuffer
"IntBuffer
"LongBuffer
"ShortBuffer
在本文后面，我将讨论第 8 种类型 MappedByteBuffer ，它用于内存映射文件。如果您必须使用的类型不是这些基本类型，则可以先从 ByteBuffer 获得字节类型，然后将其转换成 Object 或其它任何类型。
正如前面所提到的，每个缓冲区包含 get() 和 put() 方法，它们可以提供类型安全的版本。通常，需要重载这些 get() 和 put() 方法。例如，有了 CharBuffer ，可以用 get() 获得下一个字符，用 get(int index) 获得某个特定位置的字符，或者用 get(char[] destination) 获得一串字符。静态方法也可以创建缓冲区，因为不存在构造函数。那么，仍以 CharBuffer为例，用 CharBuffer.wrap(aString) 可以将 String对象转换成 CharBuffer 。为了演示，清单 2 接受第一个命令行参数，将它转换成 CharBuffer ，并显示参数中的每个字符：
清单 2. CharBuffer 演示
import java.nio.*;
public class ReadBuff {
public static void main(String args[]) {
if (args.length != 0) {
CharBuffer buff = CharBuffer.wrap(args[0]);
for (int i=0, n=buff.length(); i<n; i++) {
System.out.println(i + " : " + buff.get());
}
}
}
}
请注意，这里我使用了 get() ，而没有使用 get(index) 。我这样做的原因是，在每次执行 get() 操作之后，位置都会移动，所以不需要手工来声明要检索的位置。
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直接 vs. 间接
既然已经了解了典型的缓冲区，那么让我们研究直接缓冲区与间接缓冲区之间的差别。在创建缓冲区时，可以要求创建直接缓冲区，创建直接缓冲区的成本要比创建间接缓冲区高，但这可以使运行时环境直接在该缓冲区上进行较快的本机 I/O 操作。因为创建直接缓冲区所增加的成本，所以直接缓冲区只用于长生存期的缓冲区，而不用于短生存期、一次性且用完就丢弃的缓冲区。而且，只能在 ByteBuffer 这个级别上创建直接缓冲区，如果希望使用其它类型，则必须将 Buffer 转换成更具体的类型。为了演示，清单 3 中代码的行为与清单 2 的行为一样，但清单 3 使用直接缓冲区：
清单 3. 列出网络接口
import java.nio.*;
public class ReadDirectBuff {
public static void main(String args[]) {
if (args.length != 0) {
String arg = args[0];
int size = arg.length();
ByteBuffer byteBuffer = ByteBuffer.allocateDirect(size*2);
CharBuffer buff = byteBuffer.asCharBuffer();
buff.put(arg);
buff.rewind();
for (int i=0, n=buff.length(); i<n; i++) {
System.out.println(i + " : " + buff.get());
}
}
}
}
在上面的代码中，请注意，不能只是将 String 包装在直接 ByteBuffer中。必须首先创建一个缓冲区，先填充它，然后将位置倒回起始点，这样才能从头读。还要记住，字符长度是字节长度的两倍，因此示例中会有 size*2 。
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内存映射文件
第 8 种 Buffer 类型 MappedByteBuffer 只是一种特殊的 ByteBuffer 。 MappedByteBuffer 将文件所在区域直接映射到内存。通常，该区域包含整个文件，但也可以只映射部分文件。所以，必须指定要映射文件的哪部分。而且，与其它 Buffer 对象一样，这里没有构造函数；必须让 java.nio.channels.FileChannel的 map() 方法来获取 MappedByteBuffer 。此外，无需过多涉及通道就可以用 getChannel() 方法从 FileInputStream 或 FileOutputStream获取 FileChannel 。通过从命令行传入文件名来读取文本文件的内容，清单 4 显示了 MappedByteBuffer ：
清单 4. 读取内存映射文本文件
import java.io.*;
import java.nio.*;
import java.nio.channels.*;
import java.nio.charset.*;
public class ReadFileBuff {
public static void main(String args[]) throws IOException {
if (args.length != 0) {
String filename = args[0];
FileInputStream fis = new FileInputStream(filename);
FileChannel channel = fis.getChannel();
int length = (int)channel.size();
MappedByteBuffer byteBuffer =
channel.map(FileChannel.MapMode.READ_ONLY, 0, length);
Charset charset = Charset.forName("ISO-8859-1");
CharsetDecoder decoder = charset.newDecoder();
CharBuffer charBuffer = decoder.decode(byteBuffer);
for (int i=0, n=charBuffer.length(); i<n; i++) {
System.out.print(charBuffer.get());
}
}
}
}
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Size: 5876 |
Author: 635868631@qq.com |
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Description: 该目录下包含了实施ISO/IEC DIS 13818-2标准的源程序。它可以将为压缩的图像 转化成MPEG-1和MPEG-2视频编码流，同时也可以进行逆变换。 doc/目录下的mpeg2enc.doc和mpeg2dec.doc文件包含了关于解码器的进一步的信 息。verify/目录下是一组用来进行验证的图像和小的数据流，以及用来自动检测编码 器和解码器输出的Unix shell脚本文件。 在src/目录下有两个子目录mpeg2enc/和mpeg2dec/，其中包含了编码器和解码器 的源代码，以及在VC下编译过的可执行程序。par/目录下给出了一组可在每秒25和30帧 的速率下进行MPEG-2和MPEG-1编码的编码器参数文件。 可以在标准的C编译器中，编译makefile文件来运行该程序。 在bin/目录下，给出了该文件的可执行程序。 在mpeg2ply/目录下包含了一个用来播放mpeg1和mpeg2视频流的windows可执行程序。-this directory contains the implementation of the ISO/IEC DIS 13818-2 standards of the source. It will be compressed images into MPEG-1 and MPEG-2 video encoding flow, but also for inverse transform. Doc/directory and the mpeg2enc.doc mpeg2dec.doc document contains decoders for further information. Verify/directory is a group used for the certification of small images and data flow, and used to automatically detect encoder and decoder output of the Unix shell script file. In src/directory there are two subdirectories mpeg2enc and/mpeg2dec /, which includes the encoder and decoder source code, and the VC compiled executable programs. Par/directory is given in a second group of 25 and 30 under the rate of MPEG-2 and MPEG-1 encoding of the document encoding parameters. The standar
Platform: |
Size: 603136 |
Author: 万祥兵 |
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Description: 该目录下包含了实施ISO/IEC DIS 13818-2标准的源程序。它可以将为压缩的图像转化成MPEG-1和MPEG-2视频编码流，同时也可以进行逆变换。doc/目录下的mpeg2enc.doc和mpeg2dec.doc文件包含了关于解码器的进一步的信息。verify/目录下是一组用来进行验证的图像和小的数据流，以及用来自动检测编码器和解码器输出的Unix shell脚本文件。 在src/目录下有两个子目录mpeg2enc/和mpeg2dec/，其中包含了编码器和解码器的源代码，以及在VC下编译过的可执行程序。par/目录下给出了一组可在每秒25和30帧的速率下进行MPEG-2和MPEG-1编码的编码器参数文件。可以在标准的C编译器中，编译makefile文件来运行该程序。在bin/目录下，给出了该文件的可执行程序。 在mpeg2ply/目录下包含了一个用来播放mpeg1和mpeg2视频流的windows可执行程序。-this directory contains the implementation of the ISO/IEC DIS 13818-2 standards of the source. It will be compressed images into MPEG-1 and MPEG-2 video encoding flow, but also for inverse transform. Doc/directory and the mpeg2enc.doc mpeg2dec.doc document contains decoders for further information. Verify/directory is a group used for the certification of small images and data flow, and used to automatically detect encoder and decoder output of the Unix shell script file. In src/directory there are two subdirectories mpeg2enc and/mpeg2dec /, which includes the encoder and decoder source code, and the VC compiled executable programs. Par/directory is given in a second group of 25 and 30 under the rate of MPEG-2 and MPEG-1 encoding of the document encoding parameters. The standar
Platform: |
Size: 604160 |
Author: 邓志国 |
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Description: Sklmp4 consists in portable C++ sources of a library capable of encoding
and decoding MPEG-4 video bitstream. Bitstreams conforming to ISO/IEC 14496-2
(version 2) Advance Simple Profile are fully supported by the
decoder. Partial support for MPEG-1/2 bitstreams (ISO/IEC 13818-2)
is also supplied.-Sklmp4 consists in portable C sources of a l ibrary capable of encoding and decoding MPEG-4 video bitstream. Bitstreams conforming to ISO/IEC 14496-2 (version 2) Advance Simple Profil e are fully supported by the decoder. Partial su 17 for MPEG-1/2 bitstreams (ISO/IEC 13818- 2) is also supplied.
Platform: |
Size: 487424 |
Author: eckuk |
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Description: MPEG-4的解码器。 This MoMuSys implementation of MPEG-4 was originally
developed in the course of development of the MPEG-4 Video
(ISO/IEC 14496-2) standard. This software module is an
implementation of a part of one or more MPEG-4 Video
(ISO/IEC 14496-2) tools as specified by the MPEG-4 Video
(ISO/IEC 14496-2) standard.-MPEG-4 decoder. This MoMuSys implementation of the MPEG-4 was orig inally developed in the course of development o f the MPEG-4 Video (ISO/IEC 14496-2) standard. This software module is an implementation of a p art of one or more MPEG-4 Video (ISO/IEC 14496-2 ) tools as specified by the MPEG-4 Video (ISO/IE C 14496-2) standard.
Platform: |
Size: 132096 |
Author: 凌波 |
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Description: codec for mpeg2. include encoder and decoder for audio and video
Platform: |
Size: 6885376 |
Author: 和王峰 |
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Description: Jbig2解码代码包。包中有样例程序。
jbig2dec is a decoder library and example utility implementing the JBIG2
bi-level image compression spec. Also known as ITU T.88 and ISO IEC
14492, and now included by reference in Adobe s PDF 1.4.-Jbig2 decoder code package. Package has a sample program. jbig2dec is a decoder library and example utility implementing the JBIG2bi-level image compression spec. Also known as ITU T.88 and ISO IEC14492, and now included by reference in Adobe s PDF 1.4.
Platform: |
Size: 122880 |
Author: shihong |
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Description: It s a JPEG decoder and need a lot of promotion and correction,This distribution contains the sixth public release of the Independent JPEG
Group s free JPEG software. You are welcome to redistribute this software and
to use it for any purpose, subject to the conditions under LEGAL ISSUES, below.
Serious users of this software (particularly those incorporating it into
larger programs) should contact IJG at jpeg-info@uunet.uu.net to be added to
our electronic mailing list. Mailing list members are notified of updates
and have a chance to participate in technical discussions, etc.
This software is the work of Tom Lane, Philip Gladstone, Jim Boucher,
Lee Crocker, Julian Minguillon, Luis Ortiz, George Phillips, Davide Rossi,
Guido Vollbeding, Ge Weijers, and other members of the Independent JPEG
Group.
IJG is not affiliated with the official ISO JPEG standards committee.
Platform: |
Size: 678912 |
Author: Ken |
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Description:
This package contains the following source code files:
- demo.c
Demo application source, with message packing/unpacking example
- benchmark.c
Benchmark source, to benchmark pack/unpack operations
- dl_c_iso8583_v0_0_3 (16th July 2008)
DL ISO-8583 library source files
- dl_c_common_v0_0_2 (14th October 2007)
DL Common source files (used by DL ISO-8583)
- benchmark / demo
Sample MSVC 6.0 project files-
This package contains the following source code files:
- demo.c
Demo application source, with message packing/unpacking example
- benchmark.c
Benchmark source, to benchmark pack/unpack operations
- dl_c_iso8583_v0_0_3 (16th July 2008)
DL ISO-8583 library source files
- dl_c_common_v0_0_2 (14th October 2007)
DL Common source files (used by DL ISO-8583)
- benchmark/demo
Sample MSVC 6.0 project files
Platform: |
Size: 2124800 |
Author: Daniel |
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Description: This package contains source code for the MPEG-2 audio encoder and decoder.
Platform: |
Size: 582656 |
Author: nana |
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