Android: Listener pour son enregistrement si aucun son produit

Question

Dans ma demande, je veux mettre en œuvre des méthodes qui enregistrent le son si un son est émis.

Quelque chose de similaire, comme l'application: Talking Tom Cat

Alors, que dois-je faire? Y at-il démo qui écoute pour le son et enregistrements si un son se produit?

Answer 1

Essayez ce code dans votre application ...

private int RECORDER_CHANNELS = AudioFormat.CHANNEL_CONFIGURATION_MONO;
private int RECORDER_AUDIO_ENCODING = AudioFormat.ENCODING_PCM_16BIT;
private int RECORDER_SAMPLERATE = 44100;
private byte RECORDER_BPP = (byte) 16;

private AudioRecord audioRecorder;

public void arm() {
    // Get the minimum buffer size required for the successful creation of an AudioRecord object.
    int bufferSizeInBytes = AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE, RECORDER_CHANNELS,
            RECORDER_AUDIO_ENCODING);

    // Initialize Audio Recorder.
    audioRecorder = new AudioRecord(MediaRecorder.AudioSource.MIC, RECORDER_SAMPLERATE,
            RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING, bufferSizeInBytes);

    // Start Recording.
    audioRecorder.startRecording();

    int numberOfReadBytes = 0;
    byte audioBuffer[] = new byte[bufferSizeInBytes];
    boolean recording = false;
    float tempFloatBuffer[] = new float[3];
    int tempIndex = 0;
    int totalReadBytes = 0;
    byte totalByteBuffer[] = new byte[60 * 44100 * 2];

    // While data come from microphone.
    while (true) {
        float totalAbsValue = 0.0f;
        short sample = 0;

        numberOfReadBytes = audioRecorder.read(audioBuffer, 0, bufferSizeInBytes);

        // Analyze Sound.
        for (int i = 0; i < bufferSizeInBytes; i += 2) {
            sample = (short) ((audioBuffer[i]) | audioBuffer[i + 1] << 8);
            totalAbsValue += Math.abs(sample) / (numberOfReadBytes / 2);
        }

        // Analyze temp buffer.
        tempFloatBuffer[tempIndex % 3] = totalAbsValue;
        float temp = 0.0f;
        for (int i = 0; i < 3; ++i)
            temp += tempFloatBuffer[i];

        if ((temp >= 0 && temp <= 350) && recording == false) {
            Log.i("TAG", "1");
            tempIndex++;
            continue;
        }

        if (temp > 350 && recording == false) {
            Log.i("TAG", "2");
            recording = true;
        }

        if ((temp >= 0 && temp <= 350) && recording == true) {
            Log.i("TAG", "Save audio to file.");

            // Save audio to file.
            String filepath = Environment.getExternalStorageDirectory().getPath();
            File file = new File(filepath, "AudioRecorder");
            if (!file.exists())
                file.mkdirs();

            String fn = file.getAbsolutePath() + "/" + System.currentTimeMillis() + ".wav";

            long totalAudioLen = 0;
            long totalDataLen = totalAudioLen + 36;
            long longSampleRate = RECORDER_SAMPLERATE;
            int channels = 1;
            long byteRate = RECORDER_BPP * RECORDER_SAMPLERATE * channels / 8;
            totalAudioLen = totalReadBytes;
            totalDataLen = totalAudioLen + 36;
            byte finalBuffer[] = new byte[totalReadBytes + 44];

            finalBuffer[0] = 'R'; // RIFF/WAVE header
            finalBuffer[1] = 'I';
            finalBuffer[2] = 'F';
            finalBuffer[3] = 'F';
            finalBuffer[4] = (byte) (totalDataLen & 0xff);
            finalBuffer[5] = (byte) ((totalDataLen >> 8) & 0xff);
            finalBuffer[6] = (byte) ((totalDataLen >> 16) & 0xff);
            finalBuffer[7] = (byte) ((totalDataLen >> 24) & 0xff);
            finalBuffer[8] = 'W';
            finalBuffer[9] = 'A';
            finalBuffer[10] = 'V';
            finalBuffer[11] = 'E';
            finalBuffer[12] = 'f'; // 'fmt ' chunk
            finalBuffer[13] = 'm';
            finalBuffer[14] = 't';
            finalBuffer[15] = ' ';
            finalBuffer[16] = 16; // 4 bytes: size of 'fmt ' chunk
            finalBuffer[17] = 0;
            finalBuffer[18] = 0;
            finalBuffer[19] = 0;
            finalBuffer[20] = 1; // format = 1
            finalBuffer[21] = 0;
            finalBuffer[22] = (byte) channels;
            finalBuffer[23] = 0;
            finalBuffer[24] = (byte) (longSampleRate & 0xff);
            finalBuffer[25] = (byte) ((longSampleRate >> 8) & 0xff);
            finalBuffer[26] = (byte) ((longSampleRate >> 16) & 0xff);
            finalBuffer[27] = (byte) ((longSampleRate >> 24) & 0xff);
            finalBuffer[28] = (byte) (byteRate & 0xff);
            finalBuffer[29] = (byte) ((byteRate >> 8) & 0xff);
            finalBuffer[30] = (byte) ((byteRate >> 16) & 0xff);
            finalBuffer[31] = (byte) ((byteRate >> 24) & 0xff);
            finalBuffer[32] = (byte) (2 * 16 / 8); // block align
            finalBuffer[33] = 0;
            finalBuffer[34] = RECORDER_BPP; // bits per sample
            finalBuffer[35] = 0;
            finalBuffer[36] = 'd';
            finalBuffer[37] = 'a';
            finalBuffer[38] = 't';
            finalBuffer[39] = 'a';
            finalBuffer[40] = (byte) (totalAudioLen & 0xff);
            finalBuffer[41] = (byte) ((totalAudioLen >> 8) & 0xff);
            finalBuffer[42] = (byte) ((totalAudioLen >> 16) & 0xff);
            finalBuffer[43] = (byte) ((totalAudioLen >> 24) & 0xff);

            for (int i = 0; i < totalReadBytes; ++i)
                finalBuffer[44 + i] = totalByteBuffer[i];

            FileOutputStream out;
            try {
                out = new FileOutputStream(fn);
                try {
                    out.write(finalBuffer);
                    out.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

            } catch (FileNotFoundException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }

            // */
            tempIndex++;
            break;
        }

        // -> Recording sound here.
        Log.i("TAG", "Recording Sound.");
        for (int i = 0; i < numberOfReadBytes; i++)
            totalByteBuffer[totalReadBytes + i] = audioBuffer[i];
        totalReadBytes += numberOfReadBytes;
        // */

        tempIndex++;
    }
}

Pour plus de détails, vous pouvez aussi regarder cette démo ...

http://musicg.googlecode.com/files/musicg_android_demo.zip

Answer 2

S'il vous plaît visitez la page sur les développeurs Android Audio capture .

Il a un exemple de code qui montre comment les captures et les sons de jeu.

Answer 3

Je suis en train quelque chose de similaire. D'après ce que je vous ai vu devez commencer l'enregistrement avant de pouvoir lire les niveaux audio. Donc, je suis en train de mesurer l'amplitude et augmenter la durée de l'enregistrement et enregistrez le fichier à un emplacement différent si le MaxAmplitude atteint un point audible.

Cela étant dit, je suis très nouveau à la programmation, et apprécierais vraiment des conseils supplémentaires ou astuces.