如何在Android中将音频原始转换为flac

概述我用类audoiRecord录制音频.现在我想将音频原始文件转换为* flac格式.我将*原始文件转换为wav下一步： private void copyWaveFile(String inFilename,String outFilename){ FileInputStream in = null; FileOutputStream out = null; long to 我用类audoiRecord录制音频.现在我想将音频原始文件转换为* flac格式.我将*原始文件转换为wav下一步：

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();    }}

这段代码负责文件头

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,44);}

我不明白* flac文件的参数应该是什么

解决方法 您需要一个编码器将pcm数据转换为flac格式.您不能只更改标题并期望内容作为flac工作.

AndroID(至少到4.1)不包括FLAC编码器,尽管从3.1开始支持解码器(来源：http://developer.android.com/guide/appendix/media-formats.html).

我没有直接经验,但已经看到人们使用ffmpeg作为flac编码器.该项目audioboo-android包含本机libFLAC / libFLAC编码器,看起来很有趣.

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