我在解决基于它的字节的mp3文件中的数据时遇到问题.
输出的第一部分是正确的,我有一个长达254秒的mp3文件,我从Github的mp3解析库mp3agic获取它的信息.
但是,关于帧长度和持续时间的信息的第二部分是不正确的.
Length of this mp3 is: 254 seconds
Bitrate: 320 kbps (CBR)
Sample rate: 44100 Hz
Has ID3v1 tag?: NO
Has ID3v2 tag?: YES
Has custom tag?: NO
framelength -1
framerate 38.28125
duration -271265.06
我用来获取帧长度,帧速率和持续时间的代码是:
File file = musicFile.getFileValue();
this.audioStream.startMusicStream(file);
try {
AudioInputStream audioInputStream = AudioSystem.getAudioInputStream(file);
AudioFormat format = audioInputStream.getFormat();
long audioFileLength = file.length();
int frameSize = format.getFrameSize();
float frameRate = format.getFrameRate();
float durationInSeconds = (audioFileLength / (frameSize * frameRate));
System.out.println("framelength "+frameSize);
System.out.println("framerate "+frameRate);
System.out.println("duration "+durationInSeconds);
this.setDurationLabel(durationInSeconds);
} catch (Exception e) {
e.printStackTrace();
}
所有的拳头,为什么帧长和其他测量甚至是负的?那有什么意思?如何使用audioinputstream和audioformat中的信息准确计算mp3文件的持续时间?
最佳答案 对于帧长度和持续时间,您可以使用:
long frameLen = audioInputStream.getFrameLength();
double durationInSeconds = (frameLen+0.0) / format.getFrameRate();
功能说明:
getFrameLength:Obtains the length of the stream, expressed in sample frames rather than bytes.Returns:the length in sample frames
getFrameRate:Obtains the frame rate in frames per second.Returns:the number of frames per second, or AudioSystem.NOT_SPECIFIED
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