Bass库Mp3转wav、samplerate/channel修改[通俗易懂]

全栈程序员站长

发布于 2022-09-27 16:10:58

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发布于 2022-09-27 16:10:58

文章被收录于专栏：全栈程序员必看

代码地址：https://download.csdn.net/download/qq_14931305/10803169

Bass库官网：http://www.un4seen.com/

Bass库参考文档：http://www.un4seen.com/doc/#bass/bass.html

1.Bass库集成

集成请参考我之前的博客：https://blog.csdn.net/qq_14931305/article/details/84374301

需要注意的是，此处集成还需添加 libbassmix.so

2.Mp3转Wav、Channel/Samplerate修改

无论是Mp3转Wav还是Channel/Samplerate的修改都可采用以下方法，操作步骤都是将文件先转成pcm，然后再转成wav文件

3.代码

BassOperationHelper类核心代码

static boolean mp3ToPcm(String pathMp3, String pathPcm,int wavSize) {
        if (!BASS.BASS_Init(-1,mSampleRate,0)) {
            Error("cannot BASS_Init");
            return false;
        }
        // 重采样后的流
        int mixedStream = BASSmix.BASS_Mixer_StreamCreate(mSampleRate, mChannels, BASS.BASS_STREAM_DECODE | BASSmix.BASS_MIXER_END);
        if (mixedStream == 0){
            Error("BASS_Mixer_StreamCreate error");
            return false;
        }
        // 原音频流
        int srcStream = BASS.BASS_StreamCreateFile(pathMp3, 0, 0, BASS.BASS_STREAM_DECODE);
        if (srcStream == 0){
            Error("BASS_StreamCreateFile error");
            return false;
        }

        //将源音频流加入到Mixer里面，以实现重采样转换  
        boolean flag = BASSmix.BASS_Mixer_StreamAddChannelEx(mixedStream,srcStream,0,0,wavSize);// plug in the source  
        //如果全部转换成wav文件，请采用下面这个方法
        //boolean flag = BASSmix.BASS_Mixer_StreamAddChannelEx(mixedStream,srcStream,0);// plug in the source 

        if (!flag){
            Error("BASS_Mixer_StreamAddChannel error");
            return false;
        }
        try {
            // 写到output流
            ByteBuffer byteBuffer = ByteBuffer.allocate(wavSize);
            FileOutputStream fos = new FileOutputStream(pathPcm);
            while (BASS.BASS_ChannelIsActive(mixedStream) != BASS.BASS_ACTIVE_STOPPED)
            {
                BASS.BASS_ChannelGetData(mixedStream, byteBuffer, byteBuffer.capacity());
                fos.write(byteBuffer.array());
            }
            BASSmix.BASS_Mixer_ChannelRemove(mixedStream);
            BASSmix.BASS_Mixer_ChannelRemove(srcStream);
            BASS.BASS_Free();
        } catch (IOException e) {
            e.printStackTrace();
            Error(e.getMessage());
            return false;
        }

        return true;
    }

MainActivity类调用

private static final String oldFilePath ="/storage/emulated/0/夏季.wav";
    private static final String newFilePath ="/storage/emulated/0/夏季"+System.currentTimeMillis()+".wav";

BassOperationHelper.modifyChannelOrSample(oldFilePath, newFilePath, 1024 * 3000, new BassOperationHelper.Mp3ToWavCallBack() {
                    @Override
                    public void onComplete(boolean isSuccess) {
                        //mp3转pcm
                        Log.e("BassOperationHelper","oldFilePath= "+oldFilePath);
                        Log.e("BassOperationHelper","newFilePath= "+newFilePath);
                        if (isSuccess){
                            Toast.makeText(MainActivity.this,"文件操作成功",Toast.LENGTH_SHORT).show();
                        }else {
                            Toast.makeText(MainActivity.this,"文件操作失败",Toast.LENGTH_SHORT).show();
                        }
                    }
                });

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