问题描述
我记录带班audoiRecord音频。现在我想转换音频原始文件为* FLAC格式。我转换*原始文件为WAV下一方式:
I recording audio with class audoiRecord. Now I want convert audio raw file to *flac format. I convert *raw file to wav next way:
private void copyWaveFile(String inFilename,String outFilename){
FileInputStream in = null;
FileOutputStream out = null;
long totalAudioLen = 0;
long totalDataLen = totalAudioLen + 36;
long longSampleRate = sampleRate;
int channels = 2;
long byteRate = RECORDER_BPP * sampleRate * channels/8;
byte[] data_pcm = new byte[mAudioBufferSize];
try {
in = new FileInputStream(inFilename);
out = new FileOutputStream(outFilename);
totalAudioLen = in.getChannel().size();
totalDataLen = totalAudioLen + 36;
Log.i(TAG,"File size: " + totalDataLen);
WriteWaveFileHeader(out, totalAudioLen, totalDataLen,
longSampleRate, channels, byteRate);
while(in.read(data_pcm) != -1){
out.write(data_pcm);
}
in.close();
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
这件code是负责文件标题
This piece of code is responsible for the file header
private void WriteWaveFileHeader(
FileOutputStream out, long totalAudioLen,
long totalDataLen, long longSampleRate, int channels,
long byteRate) throws IOException {
byte[] header = new byte[44];
header[0] = 'R'; // RIFF/WAVE header
header[1] = 'I';
header[2] = 'F';
header[3] = 'F';
header[4] = (byte) (totalDataLen & 0xff);
header[5] = (byte) ((totalDataLen >> 8) & 0xff);
header[6] = (byte) ((totalDataLen >> 16) & 0xff);
header[7] = (byte) ((totalDataLen >> 24) & 0xff);
header[8] = 'W';
header[9] = 'A';
header[10] = 'V';
header[11] = 'E';
header[12] = 'f'; // 'fmt ' chunk
header[13] = 'm';
header[14] = 't';
header[15] = ' ';
header[16] = 16; // 4 bytes: size of 'fmt ' chunk
header[17] = 0;
header[18] = 0;
header[19] = 0;
header[20] = 1; // format = 1
header[21] = 0;
header[22] = (byte) channels;
header[23] = 0;
header[24] = (byte) (longSampleRate & 0xff);
header[25] = (byte) ((longSampleRate >> 8) & 0xff);
header[26] = (byte) ((longSampleRate >> 16) & 0xff);
header[27] = (byte) ((longSampleRate >> 24) & 0xff);
header[28] = (byte) (byteRate & 0xff);
header[29] = (byte) ((byteRate >> 8) & 0xff);
header[30] = (byte) ((byteRate >> 16) & 0xff);
header[31] = (byte) ((byteRate >> 24) & 0xff);
header[32] = (byte) (2 * 16 / 8); // block align
header[33] = 0;
header[34] = RECORDER_BPP; // bits per sample
header[35] = 0;
header[36] = 'd';
header[37] = 'a';
header[38] = 't';
header[39] = 'a';
header[40] = (byte) (totalAudioLen & 0xff);
header[41] = (byte) ((totalAudioLen >> 8) & 0xff);
header[42] = (byte) ((totalAudioLen >> 16) & 0xff);
header[43] = (byte) ((totalAudioLen >> 24) & 0xff);
out.write(header, 0, 44);
}
我不明白什么应该是* FLAC文件的参数
I do not understand what should be the parameters of the *flac file
推荐答案
您需要一间codeR到PCM数据转换成FLAC格式。你不能只是改变标题,并期望内容为后手工作。
You need an encoder to convert pcm data to flac format. You cannot just change the header and expect the content to work as flac.
Android的(至少到4.1),不包括FLAC连接codeR,虽然有3.1起(资料来源支持的德codeR:的)。
Android (at least till 4.1) does not include a FLAC encoder, although there is a decoder supported from 3.1 onwards (Source: http://developer.android.com/guide/appendix/media-formats.html).
这篇关于如何转换音频生Android中后手的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!