[英]How to recognize the audio stream format?
Here I have the code which records a audio stream to file. 这里我有将音频流录制到文件的代码。 The problem is I'd like to save this file with correct file extension (mainly .mp3 and .aac). 问题是我想用正确的文件扩展名(主要是.mp3和.aac)保存这个文件。 How can I achieve this? 我怎样才能做到这一点?
URLConnection conn = new URL(StringUrls[0]).openConnection();
InputStream in = conn.getInputStream();
BufferedOutputStream bufOutstream = new BufferedOutputStream(new FileOutputStream(new File(env.getExternalStorageDirectory()+"/temp.file")));
byte[] buffer = new byte[4096];
int len = in.read(buffer);
while (len != -1) {
bufOutstream.write(buffer, 0, len);
len = in.read(buffer);
if (Recorder.this.isCancelled) break;
}
bufOutstream.close();
One way would be to take a look at the binary data while you already have it in your hands. 一种方法是在您掌握二进制数据的同时查看二进制数据。 According to this File signatures table both MP3 and AAC have unique magic headers: 根据这个文件签名表 ,MP3和AAC都有独特的魔术标题:
49 44 33
for MPEG-1 Audio Layer 3 (MP3) audio file 49 44 33
用于MPEG-1音频第3层(MP3)音频文件 FF F1
for MPEG-4 Advanced Audio Coding (AAC) Low Complexity (LC) audio FF F1
用于MPEG-4高级音频编码(AAC)低复杂度(LC)音频 FF F9
for MPEG-2 Advanced Audio Coding (AAC) Low Complexity (LC) audio FF F9
用于MPEG-2高级音频编码(AAC)低复杂度(LC)音频
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