保存到文件：
void saveToFile(String filename, ByteBuffer buffer) { byte[] bytes = buffer.array(); OutputStream outStream = null; try { File file = new File(filename); String directory = file.getParent(); if(Files.notExists(Paths.get(directory))) { Files.createDirectories(Paths.get(directory)); } //TODO:改成nio FileChannel outStream = new FileOutputStream(file); /** * 8 bit Unsigned * 16 bit Signed 16000 16 */ //TODO:改成直接操作二进制的代码 StdWavFile:signed 16bit pcm le wav WaveFileWriter writer = new WaveFileWriter(); AudioFormat frmt = new AudioFormat(16000, 16, 1, true, false); ByteArrayInputStream bi = new ByteArrayInputStream(bytes); InputStream in = new AudioInputStream(bi, frmt,bytes.length); writer.write((AudioInputStream) in, AudioFileFormat.Type.WAVE, outStream); outStream.close(); } catch (Exception e) { getLogger().error("文件保存失败:{}",e); } }
其他方法：
/*** * 将pcm音频流封装成wave音频流 * @param rawData 音频流 * @param sampleRate 采样率 * @return * @throws IOException */ private byte[] rawToWave(final byte[] rawData, int sampleRate) throws IOException { DataOutputStream output = null; try { ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); output = new DataOutputStream(outputStream); // WAVE header // see http://ccrma.stanford.edu/courses/422/projects/WaveFormat/ writeString(output, "RIFF"); // chunk id writeInt(output, 36 + rawData.length); // chunk size writeString(output, "WAVE"); // format writeString(output, "fmt "); // subchunk 1 id writeInt(output, 16); // subchunk 1 size writeShort(output, (short) 1); // audio format (1 = PCM) writeShort(output, (short) 1); // number of channels writeInt(output, sampleRate); // sample rate writeInt(output, sampleRate * 2); // byte rate writeShort(output, (short) 2); // block align writeShort(output, (short) 16); // bits per sample writeString(output, "data"); // subchunk 2 id writeInt(output, rawData.length); // subchunk 2 size // Audio data (conversion big endian -> little endian) short[] shorts = new short[rawData.length / 2]; ByteBuffer.wrap(rawData).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer().get(shorts); ByteBuffer bytes = ByteBuffer.allocate(shorts.length * 2); for (short s : shorts) { bytes.putShort(s); } output.write(rawData); return outputStream.toByteArray(); } finally { if (output != null) { output.close(); } } } /*** * 将pcm音频流封装成wave音频文件 * @param rawData 原始音频 * @param sampleRate 采样率 * @param waveFile wave声音文件 * @throws IOException */ private void rawToWave(final byte[] rawData, int sampleRate,final File waveFile) throws IOException { DataOutputStream output = null; try { output = new DataOutputStream(new FileOutputStream(waveFile)); // WAVE header // see http://ccrma.stanford.edu/courses/422/projects/WaveFormat/ writeString(output, "RIFF"); // chunk id writeInt(output, 36 + rawData.length); // chunk size writeString(output, "WAVE"); // format writeString(output, "fmt "); // subchunk 1 id writeInt(output, 16); // subchunk 1 size writeShort(output, (short) 1); // audio format (1 = PCM) writeShort(output, (short) 1); // number of channels writeInt(output, sampleRate); // sample rate writeInt(output, sampleRate * 2); // byte rate writeShort(output, (short) 2); // block align writeShort(output, (short) 16); // bits per sample writeString(output, "data"); // subchunk 2 id writeInt(output, rawData.length); // subchunk 2 size // Audio data (conversion big endian -> little endian) short[] shorts = new short[rawData.length / 2]; ByteBuffer.wrap(rawData).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer().get(shorts); ByteBuffer bytes = ByteBuffer.allocate(shorts.length * 2); for (short s : shorts) { bytes.putShort(s); } output.write(rawData); } finally { if (output != null) { output.close(); } } } /*** * 将pcm音频文件封装成wave文件 * @param rawFile pcm音频数据文件 * @param sampleRate 采样率 * @param waveFile wave文件 * @throws IOException */ private void rawToWave(final File rawFile, int sampleRate,final File waveFile) throws IOException { byte[] rawData = new byte[(int) rawFile.length()]; DataInputStream input = null; try { input = new DataInputStream(new FileInputStream(rawFile)); input.read(rawData); } finally { if (input != null) { input.close(); } } DataOutputStream output = null; try { output = new DataOutputStream(new FileOutputStream(waveFile)); // WAVE header // see http://ccrma.stanford.edu/courses/422/projects/WaveFormat/ writeString(output, "RIFF"); // chunk id writeInt(output, 36 + rawData.length); // chunk size writeString(output, "WAVE"); // format writeString(output, "fmt "); // subchunk 1 id writeInt(output, 16); // subchunk 1 size writeShort(output, (short) 1); // audio format (1 = PCM) writeShort(output, (short) 1); // number of channels writeInt(output, sampleRate); // sample rate writeInt(output, sampleRate * 2); // byte rate writeShort(output, (short) 2); // block align writeShort(output, (short) 16); // bits per sample writeString(output, "data"); // subchunk 2 id writeInt(output, rawData.length); // subchunk 2 size // Audio data (conversion big endian -> little endian) short[] shorts = new short[rawData.length / 2]; ByteBuffer.wrap(rawData).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer().get(shorts); ByteBuffer bytes = ByteBuffer.allocate(shorts.length * 2); for (short s : shorts) { bytes.putShort(s); } output.write(fullyReadFileToBytes(rawFile)); } finally { if (output != null) { output.close(); } } } byte[] fullyReadFileToBytes(File f) throws IOException { int size = (int) f.length(); byte bytes[] = new byte[size]; byte tmpBuff[] = new byte[size]; FileInputStream fis= new FileInputStream(f); try { int read = fis.read(bytes, 0, size); if (read < size) { int remain = size - read; while (remain > 0) { read = fis.read(tmpBuff, 0, remain); System.arraycopy(tmpBuff, 0, bytes, size - remain, read); remain -= read; } } } catch (IOException e){ throw e; } finally { fis.close(); } return bytes; } private void writeInt(final DataOutputStream output, final int value) throws IOException { output.write(value >> 0); output.write(value >> 8); output.write(value >> 16); output.write(value >> 24); } private void writeShort(final DataOutputStream output, final short value) throws IOException { output.write(value >> 0); output.write(value >> 8); } private void writeString(final DataOutputStream output, final String value) throws IOException { for (int i = 0; i < value.length(); i++) { output.write(value.charAt(i)); } }
代码来源：https://stackoverflow.com/questions/37281430/how-to-convert-pcm-file-to-wav-or-mp3