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View Code? Open in Web Editor NEWJAVA开源程序,包含MP3解码器库和播放器
License: Other
JAVA开源程序,包含MP3解码器库和播放器
License: Other
jmp123 版本0.400 迄今为止最快的MP3解码器[1] 2012.09.23 ======================================================================== 1.注意事项 ------------------------------------------------------------------------ (1)使用本程序之前请先阅读Copyright.txt。 (2)发现bug请到主页报告。 2.如何编译、启动播放 ------------------------------------------------------------------------ (1)编译 windows 平台用户运行 build.cmd 批命令脚本; linux 平台用户运行 build.sh 批命令脚本; (2)启动控制台迷你播放器 java -jar jmp123.jar <文件名> 或 java -cp bin jmp123.demo.Play <文件名> 指定的文件名是本地磁盘MP3文件。 3.解码速度测试(只解码不播放)[2] ------------------------------------------------------------------------ java -cp jmp123.jar jmp123.demo.Test <文件名> 或 java -cp bin jmp123.demo.Test <文件名> 指定 JVM 参数,解码速度更快: java -server -XX:+AggressiveOpts -cp jmp123.jar jmp123.demo.Test <文件名> 指定的文件名为本地磁盘MP3文件。 4.主页 ------------------------------------------------------------------------ http://jmp123.sf.net/ ======================================================================== 注:[1]必须是在2核心及以上CPU并且指定JVM参数"-server -XX:+AggressiveOpts" 的条件下测试解码速度才足够快。和其它任何计算机语言写的并且目前是开源的 MP3解码器实测对比,jmp123 v0.400是最快的。 [2]由于解码速度很快,指定的MP3文件播放时长60分钟以上测试结果更可信,MP3文 件的位率越大越好。 ======================================================================== 附:jmp123 v0.400 的一组解码速度实测数据 java -server -XX:+AggressiveOpts -cp bin jmp123.demo.Test image.mp3 [busy waits: outputLock.wait=17007, ch=0, ciLock.wait=11689, pcmbufLock.wait=3335] [busy waits: outputLock.wait=17007, ch=1, ciLock.wait=10132, pcmbufLock.wait=7918] MPEG-1, Layer 3, 44100Hz, Joint Stereo(M/S) length: 110815600 bytes, 176293 frames elapsed time: 9,146,123,553ns (9.146123553s, 19275.16 fps) 测试环境: (1) JDK java version "1.6.0_29" Java(TM) SE Runtime Environment (build 1.6.0_29-b11) Java HotSpot(TM) Client VM (build 20.4-b02, mixed mode, sharing) (2) CPU intel e5800(2核心,3.2GHz) (2) 目标文件 image.mp3 编码VBR,平均位率196 kbps,共176293帧,播放时长76:45
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