Java实现PCM格式音频转MP3或WAV
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 2020-02-02
*/
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 hz
WaveHeader 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;
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 header
fos.write(h, 0, h.length);
//write data stream
fis = 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 2020-02-02
*/
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 hz
WaveHeader 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 header
fos.write(h, 0, h.length);
// write data stream
fis = 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 2020-04-03
*/
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);
}
}
}