@[TOC](錄制音頻后 播放速度變快)

錄制音頻文件

我使用aduiorecord錄制pcm文件 錄制代碼如下

創(chuàng)建實(shí)例

mAudioRecorder = new AudioRecord(
                        mRecorderBuilder.mAudioSource,
                        sample_rate,
                        channel_config, 
                        format,
                        mRecorderBuilder.bufferSize);
                        

其中參數(shù)含義

private int mAudioSource = MediaRecorder.AudioSource.VOICE_COMMUNICATION;//自動(dòng)降噪,也嘗試過 MIC
        private int mSampleRate = SAMPLE_RATE_44K_HZ;//44100
        private int mChannelConfig = AudioFormat.CHANNEL_IN_MONO;//單聲道
        private int mAudioFormat = AudioFormat.ENCODING_PCM_16BIT;//每次采樣位數(shù)
        mRecorderBuilder.bufferSize//緩沖區(qū)大小,其值大于 用AudioRecord.getMinBufferSize(sample_rate, channel_config, format) 獲取的最小值

錄音

//mPcmBuffer.size就是上面的mRecorderBuilder.bufferSize 大小
//private short[] mPcmBuffer
    mAudioRecorder.read(mPcmBuffer, 0, mPcmBuffer.length);

存儲(chǔ)

我是通過隨機(jī)存儲(chǔ)文件對(duì)象,進(jìn)行數(shù)據(jù)的存儲(chǔ).
由于需要存儲(chǔ)為wav格式的文件,因此需要寫頭文件.
頭文件中需要計(jì)算 當(dāng)前錄音的格式 數(shù)據(jù)
第一次寫,網(wǎng)上找的格式寫的^[1]

RandomAccessFile rand = new RandomAccessFile(saveFile, "rw");

RandomAccessFile rand = randomAccessFile;


        long totalDataLen = totalAudioLen + 36;
        rand.seek(0);

        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) (nChannels & 0xff);
        header[23] = (byte) ((nChannels >> 8) & 0xff);

        header[24] = (byte) (sampleRate & 0xff);//采樣率
        header[25] = (byte) ((sampleRate >> 8) & 0xff);
        header[26] = (byte) ((sampleRate >> 16) & 0xff);
        header[27] = (byte) ((sampleRate >> 24) & 0xff);

        header[28] = (byte) (byteRate & 0xff);//取八位
        header[29] = (byte) ((byteRate >> 8) & 0xff);
        header[30] = (byte) ((byteRate >> 16) & 0xff);
        header[31] = (byte) ((byteRate >> 24) & 0xff);

        int b = weikuan * nChannels / 8;//每次采樣的大小
        header[32] = (byte) (b & 0xff); // block align
        header[33] = (byte) ((b >> 8) & 0xff);
        header[34] = (byte) (weikuan & 0xff);
        header[35] = (byte) ((weikuan >> 8) & 0xff);
        header[36] = 'd';//data
        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);

        rand.write(header, 0, 44);

寫完之后將寫入pcm數(shù)據(jù)流 我這里分裝了一個(gè)對(duì)象,單獨(dú)開了一個(gè)寫文件線程.
通過handler 開啟工作線程(之前的錄音也是一個(gè)單獨(dú)的線程具體看demo)

saveFileThread = new SaveFileThread();
        saveFileThread.start();
        saveHandler = new SaveFileThread.SaveHandler(saveFileThread);

                if (msg.what == SAVEING) {
                    saving = true;
                    while (saveFileThread.doWork() > 0) ;
//                  Log.e(SaveFileThreadTAG, "收到 msg");

                    saving = false;
                } else if (msg.what == STOP) {
                    saveFileThread.finish();
                    removeCallbacksAndMessages(null);
                    getLooper().quit();

                }

            SaveTask remove = saveDatas.remove(0);
            int mSize = remove.mSize;
            saveFile.saveByet(remove.saveData, 0, mSize);

至此wav文件錄制完畢

遇見的問題

錄出來的wav文件,播放時(shí) 語(yǔ)速非车福快, 感覺是快進(jìn)了兩倍.
找了很多原因都找不到,網(wǎng)上搜了幾天,無果.只有一篇帖子很像^[2]

但是該帖子并沒有解決我的問題

特此發(fā)帖,一方面是記錄一下自己的demo
二來,希望哪位大神可以幫我看一下,我的demo到底出了說明問題

ps :demo中還實(shí)現(xiàn)了 lame庫(kù) 將 pcm格式轉(zhuǎn)換為mp3 格式的文件.使用 pcm格式文件轉(zhuǎn)換可以正常使用

我的demo地址 https://github.com/MartinLi89/myrecorder.git

1. wav頭文件說明(https://blog.csdn.net/hsy12342611/article/details/80075836) ?

2. 帖子https://blog.csdn.net/marller/article/details/52882387 ?