最近做语音合成的项目，需要把PCM格式的音频文件转换成MP3或WAV，记录一下。
Java实现的PCM格式音频文件转换MP3格式
import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;/*** PCM 转 MP3** @author QC班长* @since -02-02*/public class PcmToMp3 {public static void main(String[] agrs) throws Exception {//convertAudioFiles("resource/茯茶素是什么，有什么效果，生产工艺有哪些？.pcm", "resource/茯茶素是什么，有什么效果，生产工艺有哪些？.mp3");convertAudioFiles("tnafcs.pcm", "tnafcs.mp3");}/*** @param src 待转换文件路径* @param target 目标文件路径* @throws IOException 抛出异常*/public static String convertAudioFiles(String src, String target) throws IOException {FileInputStream fis = new FileInputStream(src);FileOutputStream fos = new FileOutputStream(target);//计算长度byte[] buf = new byte[1024 * 4];int size = fis.read(buf);int PCMSize = 0;while (size != -1) {PCMSize += size;size = fis.read(buf);}fis.close();//填入参数，比特率等等。这里用的是16位单声道 8000 hzWaveHeader header = new WaveHeader();//长度字段 = 内容的大小（PCMSize) + 头部字段的大小(不包括前面4字节的标识符RIFF以及fileLength本身的4字节)header.fileLength = PCMSize + (44 - 8);header.FmtHdrLeth = 16;header.BitsPerSample = 16;header.Channels = 1;header.FormatTag = 0x0001;header.SamplesPerSec = 16000;//正常速度是8000，这里写成了16000，速度加快一倍header.BlockAlign = (short) (header.Channels * header.BitsPerSample / 8);header.AvgBytesPerSec = header.BlockAlign * header.SamplesPerSec;header.DataHdrLeth = PCMSize;byte[] h = header.getHeader();assert h.length == 44; //WAV标准，头部应该是44字节//write headerfos.write(h, 0, h.length);//write data streamfis = new FileInputStream(src);size = fis.read(buf);while (size != -1) {fos.write(buf, 0, size);size = fis.read(buf);}fis.close();fos.close();System.out.println("PCM Convert to MP3 OK!");return "ok";}}
Java实现的PCM格式音频文件转换WAV格式
import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;/*** PCM 转 WAV** @author QC班长* @since -02-02*/public class PcmToWav {public static void main(String[] agrs) throws Exception {//convertAudioFiles("resource/茯茶素是什么，有什么效果，生产工艺有哪些？.pcm", "resource/茯茶素是什么，有什么效果，生产工艺有哪些？.mp3");convertAudioFiles("tnafcs.pcm", "tnafcs.mp3");}/*** @param src 待转换文件路径* @param target 目标文件路径* @throws IOException 抛出异常*/public static void convertAudioFiles(String src, String target) throws IOException {FileInputStream fis = new FileInputStream(src);FileOutputStream fos = new FileOutputStream(target);//计算长度byte[] buf = new byte[1024 * 4];int size = fis.read(buf);int PCMSize = 0;while (size != -1) {PCMSize += size;size = fis.read(buf);}fis.close();//填入参数，比特率等等。这里用的是16位单声道 8000 hzWaveHeader header = new WaveHeader();//长度字段 = 内容的大小（PCMSize) + 头部字段的大小(不包括前面4字节的标识符RIFF以及fileLength本身的4字节)header.fileLength = PCMSize + (44 - 8);header.FmtHdrLeth = 16;header.BitsPerSample = 16;header.Channels = 2;header.FormatTag = 0x0001;header.SamplesPerSec = 8000;header.BlockAlign = (short) (header.Channels * header.BitsPerSample / 8);header.AvgBytesPerSec = header.BlockAlign * header.SamplesPerSec;header.DataHdrLeth = PCMSize;byte[] h = header.getHeader();assert h.length == 44; //WAV标准，头部应该是44字节// write headerfos.write(h, 0, h.length);// write data streamfis = new FileInputStream(src);size = fis.read(buf);while (size != -1) {fos.write(buf, 0, size);size = fis.read(buf);}fis.close();fos.close();System.out.println("Convert OK!");}}
WaveHeader类
import java.io.ByteArrayOutputStream;import java.io.IOException;/*** WaveHeader** @author QC班长* @since -04-03*/public class WaveHeader {public final char fileID[] = {'R', 'I', 'F', 'F'};public int fileLength;public char wavTag[] = {'W', 'A', 'V', 'E'};public char FmtHdrID[] = {'f', 'm', 't', ' '};public int FmtHdrLeth;public short FormatTag;public short Channels;public int SamplesPerSec;public int AvgBytesPerSec;public short BlockAlign;public short BitsPerSample;public char DataHdrID[] = {'d', 'a', 't', 'a'};public int DataHdrLeth;public byte[] getHeader() throws IOException {ByteArrayOutputStream bos = new ByteArrayOutputStream();WriteChar(bos, fileID);WriteInt(bos, fileLength);WriteChar(bos, wavTag);WriteChar(bos, FmtHdrID);WriteInt(bos, FmtHdrLeth);WriteShort(bos, FormatTag);WriteShort(bos, Channels);WriteInt(bos, SamplesPerSec);WriteInt(bos, AvgBytesPerSec);WriteShort(bos, BlockAlign);WriteShort(bos, BitsPerSample);WriteChar(bos, DataHdrID);WriteInt(bos, DataHdrLeth);bos.flush();byte[] r = bos.toByteArray();bos.close();return r;}private void WriteShort(ByteArrayOutputStream bos, int s) throws IOException {byte[] mybyte = new byte[2];mybyte[1] = (byte) ((s << 16) >> 24);mybyte[0] = (byte) ((s << 24) >> 24);bos.write(mybyte);}private void WriteInt(ByteArrayOutputStream bos, int n) throws IOException {byte[] buf = new byte[4];buf[3] = (byte) (n >> 24);buf[2] = (byte) ((n << 8) >> 24);buf[1] = (byte) ((n << 16) >> 24);buf[0] = (byte) ((n << 24) >> 24);bos.write(buf);}private void WriteChar(ByteArrayOutputStream bos, char[] id) {for (char c : id) {bos.write(c);}}}
