科大讯飞语音合成，pcm转wav

pcm转wav相关参数：

Pcm转Wav工具类：

import android.media.AudioFormat;
import android.media.AudioRecord;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * Created by hmy
 */
public class PcmToWavUtil {
private int mBufferSize;
private int mSampleRate = 8000;//科大讯飞只接受 8000|16000
private int mChannel = AudioFormat.CHANNEL_IN_STEREO;
private int mEncoding = AudioFormat.ENCODING_PCM_16BIT;

/**
 * @param sampleRate sample rate、采样率
 * @param channel    channel、声道
 * @param encoding   Audio data format、音频格式
 */
public PcmToWavUtil(int sampleRate, int channel, int encoding) {
    this.mSampleRate = sampleRate;
    this.mChannel = channel;
    this.mEncoding = encoding;
    this.mBufferSize = AudioRecord.getMinBufferSize(mSampleRate, mChannel, mEncoding);
}

public PcmToWavUtil() {
    this.mBufferSize = AudioRecord.getMinBufferSize(mSampleRate, mChannel, mEncoding);
}

public void pcmToWav(String inFilename, String outFilename) {
    FileInputStream in;
    FileOutputStream out;
    long totalAudioLen;
    long totalDataLen;
    long longSampleRate = mSampleRate;
    int channels = 2;
    long byteRate = 16 * mSampleRate * channels / 8;
    byte[] data = new byte[mBufferSize];
    try {
        in = new FileInputStream(inFilename);
        out = new FileOutputStream(outFilename);
        totalAudioLen = in.getChannel().size();
        totalDataLen = totalAudioLen + 36;

        writeWaveFileHeader(out, totalAudioLen, totalDataLen,
                longSampleRate, channels, byteRate);
        while (in.read(data) != -1) {
            out.write(data);
        }
        in.close();
        out.close();
    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

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] = 16; // 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);
}
}