Android: Wave file creation using Raw PCM, wave file not playing

Question

I created a header for the wave file, but the created wave file does not play.

I used this https://ccrma.stanford.edu/courses/422/projects/WaveFormat/ as a link to create the wave header.

public void WriteWaveFileHeader() throws IOException { File f = new File(Environment.getExternalStorageDirectory().getAbsolutePath()+"/aaa.wav"); f.createNewFile(); FileOutputStream fos = new FileOutputStream(f); long longSampleRate=44100; int channels= AudioFormat.CHANNEL_IN_MONO; long totalAudioLen=fos.getChannel().size(); long byteRate=(16 * 44100)/8; long totalDataLen=totalAudioLen+36; 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); fos.write(header, 0, 44); File l = new File(Environment.getExternalStorageDirectory().getAbsolutePath() + "/Notate/" + MainActivity.filepath); FileInputStream fis = new FileInputStream(Environment.getExternalStorageDirectory().getAbsolutePath() + "/Notate/" + MainActivity.filepath); byte[] buffer = new byte[(int) l.length()]; int intSize = android.media.AudioTrack.getMinBufferSize(44100, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT); AudioTrack at = new AudioTrack(AudioManager.STREAM_MUSIC, 44100, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT, intSize, AudioTrack.MODE_STREAM); at.write(buffer,0,(int)l.length()); fos.write(buffer); fos.flush(); fos.close(); } 

Answer 1

try the following code:

 private void rawToWave(final File rawFile, 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, SAMPLE_RATE); // sample rate writeInt(output, SAMPLE_RATE * 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(bytes.array()); } finally { if (output != null) { output.close(); } } } 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)); } }