如何转换音频生Android中后手

本文介绍了如何转换音频生Android中后手的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 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 developer.android/guide/appendix/media-formats.html ）。

Android (at least till 4.1) does not include a FLAC encoder, although there is a decoder supported from 3.1 onwards (Source: developer.android/guide/appendix/media-formats.html).

我没有直接的经验，但看到人们使用的ffmpeg作为后手EN $ C $铬。该项目 audioboo-的Andr​​oid ，其中包含本地libFLAC / libFLAC ++ EN codeR，看起来很有趣

I do not have direct experience, but have seen people use ffmpeg as a flac encoder. This project audioboo-android, which contains the native libFLAC/libFLAC++ encoder, looks interesting.