我想要做的是从音频文件生成10秒片段,并在过程中将它们转换为WAV。我正在使用javazoom vorbisspi和mp3spi库。它适用于mp3和WAV文件,但不适用于.ogg文件。虽然列为可用格式,但将ogg转换为wav无法正常工作
我试图列出我想要的编码(PCM签名)和奇怪的可用目标格式,对于mp3文件,可用格式列表是空的(虽然它有效),而ogg文件列表则表示我想要的PCM编码(尽管它不起作用)。尽管如此,播放.ogg文件仍然有效。这里是我的代码:
AudioInputStream in = null;
AudioInputStream din = null;
AudioFileFormat fileFormat = null;
AudioFormat format = null;
fileFormat = AudioSystem.getAudioFileFormat(input);
in = AudioSystem.getAudioInputStream(input);
format = in.getFormat();
float frameRate = 44100;
int channels = format.getChannels();
AudioFormat targetFormat = new AudioFormat(
AudioFormat.Encoding.PCM_SIGNED,
frameRate,
16,
channels,
channels*2,
frameRate,
false
);
AudioFormat[] available = AudioSystem.getTargetFormats(
AudioFormat.Encoding.PCM_SIGNED, format);
System.out.println("------------------------------------");
System.out.println("Available for: " + format.toString());
for (AudioFormat e : available) {
System.out.println(e.toString());
}
if (AudioSystem.isConversionSupported(targetFormat, format)) {
din = AudioSystem.getAudioInputStream(targetFormat, in);
long frames = this.thumbNailLength * (long)frameRate;
AudioInputStream shortenedStream = new AudioInputStream(
din, targetFormat, frames);
AudioSystem.write(shortenedStream,
new AudioFileFormat.Type("WAVE", "wav"), outputFile);
}
else {
throw new IllegalArgumentException(
"Conversion to WAV from this format is not supported by the System.");
}
一个.OGG文件输出:
[java] Available for: VORBISENC 44100.0 Hz, unknown bits per sample, stereo, unknown frame size, unknown frame rate,
[java] PCM_SIGNED 44100.0 Hz, 16 bit, stereo, 4 bytes/frame, little-endian
[java] PCM_SIGNED 44100.0 Hz, 16 bit, stereo, 4 bytes/frame, big-endian
为什么不这项工作预计 ?我甚至没有例外,生成一个.wav文件,但不能由任何播放器播放。