I am trying to record sound (using Android's AudioRecord), and simultaneously play the recorded sound (using Android's AudioTrack). I initialize the recorder and output track as follows:
int buffersize = 2*AudioRecord.getMinBufferSize(8000, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT);
AudioRecord recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, 8000, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, buffersize);
AudioTrack output = new AudioTrack(AudioManager.STREAM_MUSIC, 44100, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT, AudioTrack.getMinBufferSize(44100, AudioFormat.CHANNEL_OUT_MONO, AudioFormat.ENCODING_PCM_16BIT), AudioTrack.MODE_STREAM);
Now when I press the start button this method is called:
int buffersize = 5*AudioRecord.getMinBufferSize(8000, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT);
Thread recordThread = new Thread(new Runnable() {
public void run() {
recorder.startRecording();
output.play();
long startTime = System.currentTimeMillis();
while (System.currentTimeMillis() < startTime + 3000) { // Always record 3 seconds
byte[] myBuffer = new byte[buffersize];
recorder.read(myBuffer, 0, buffersize);
output.write(myBuffer, 0, buffersize);
}
recorder.stop();
recorder.release();
output.stop();
output.release();
stopThread(); // void stopThread() {recordThread = null;}
}
}
recordThread.start();
Now all I hear is noise, nothing like the music I am recording.
What am I doing wrong? Please help.
Thanks in advance,
Jeroen D.
EDIT:
I have found the problem, namely that the rate (8000) is way too low. I tried it with 44100 on a real phone (because the android emulator supports only 8000), and now the quality is fine. Thanks for the help.
Related
I am trying to play a wav file of size 230mb and 20 min whose properties are as below:
ffmpeg -i 1.wav
Stream #0:0: Audio: pcm_s16le ([1][0][0][0] / 0x0001), 44100 Hz, stereo, s16, 1411 kb/s
I am learning how to use audiotrack.
I found two solutions to play this audio play using audiotrack.
Solution 1: the following plays the audio
int frequency = 44100;
int channelConfiguration = AudioFormat.CHANNEL_CONFIGURATION_STEREO;
int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;
int bufferSize = AudioTrack.getMinBufferSize(frequency, channelConfiguration,audioEncoding);
AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, frequency,
channelConfiguration, audioEncoding, bufferSize,
AudioTrack.MODE_STREAM);
int count = 0;
byte[] data = new byte[bufferSize];
try{
FileInputStream fileInputStream = new FileInputStream(listMusicFiles.get(0).listmusicfiles_fullfilepath);
DataInputStream dataInputStream = new DataInputStream(fileInputStream);
audioTrack.play();
while((count = dataInputStream.read(data, 0, bufferSize)) > -1){
audioTrack.write(data, 0, count);
}
audioTrack.stop();
audioTrack.release();
dataInputStream.close();
fileInputStream.close();
}
catch (FileNotFoundException e){
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Second Solution: Playing noise
int frequency = 44100;
int channelConfiguration = AudioFormat.CHANNEL_CONFIGURATION_STEREO;
int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;
int bufferSize = AudioTrack.getMinBufferSize(frequency, channelConfiguration,audioEncoding);
short[] audiodata = new short[bufferSize];
try {
DataInputStream dis = new DataInputStream(
new BufferedInputStream(new FileInputStream(
listMusicFiles.get(0).listmusicfiles_fullfilepath)));
AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, frequency,
channelConfiguration, audioEncoding, bufferSize,
AudioTrack.MODE_STREAM);
audioTrack.play();
while (dis.available() > 0) {
int i = 0;
while (dis.available() > 0 && i < audiodata.length) {
audiodata[i] = dis.readShort();
i++;
}
audioTrack.write(audiodata, 0, audiodata.length);
}
dis.close();
} catch (Throwable t) {
Log.e("AudioTrack", "Playback Failed");
}
I am new to short sample and byte samples. I tried to understand but it not so easy.
I could understand the first solution is using byte sample and the second solution is using short samples.
So why is the second solution not working.
The default size of a short type is two bytes. You might have a look at this documentation as well.
The audio track has a recommended buffer size and sample rate which can be found using the way suggested here in this answer. Please have a look.
However, it is important to play the audio using the recommended sample rate which is 44100 Hz in your case and the recommended buffer size that you get using the following code segment.
AudioTrack.getMinBufferSize(frequency, channelConfiguration, audioEncoding)
In your implementation with short array, the buffer size is doubled and hence its creating noises in case of playing the audio. I would suggest, you might consider changing the buffer size by dividing the size by two in your implementation using short.
short[] audiodata = new short[(int) bufferSize / 2];
Hope you have understood the problem.
I am Developing an app in android live streaming. I am able to stream the live videos to the YouTube channel. But the problem was, getting no audio to that live streaming video.
My code will like below
private static final int frequency= 44100;
public void recordThread() {
Log.d(MainActivity.APP_NAME, "recordThread");
int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;
int channelConfiguration = AudioFormat.CHANNEL_IN_STEREO;
int bufferSize = AudioRecord.getMinBufferSize(frequency, channelConfiguration, audioEncoding);
Log.i(MainActivity.APP_NAME, "AudioRecord buffer size: " + bufferSize);
// 16 bit PCM stereo recording was chosen as example.
AudioRecord recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, frequency, channelConfiguration,
audioEncoding, bufferSize);
recorder.startRecording();
// Make bufferSize be in samples instead of bytes.
bufferSize /= 2;
short[] buffer = new short[bufferSize];
while (!cancel) {
int bufferReadResult = recorder.read(buffer, 0, bufferSize);
// Utils.Debug("bufferReadResult: " + bufferReadResult);
if (bufferReadResult > 0) {
frameCallback.handleFrame(buffer, bufferReadResult);
} else if (bufferReadResult < 0) {
Log.w(MainActivity.APP_NAME, "Error calling recorder.read: " + bufferReadResult);
}
}
recorder.stop();
Log.d(MainActivity.APP_NAME, "exit recordThread");
}
please some suggest me the solution to get out of this issue.
Search in github. There you will find a sample project(yasea) for audio encoding. Intermix those two projects, you will get the solution.
Im trying to record speech using AudioRecord object.
It works great on all devices except Galaxy S6 edge.
Here the code
AudioRecord recorder = null;
int desiredRate = 0;
for (int rate : new int[] {44100, 8000, 11025, 16000, 22050}) {
int bufferSize = AudioRecord.getMinBufferSize(rate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT);
if (bufferSize > 0) {
// buffer size is valid, Sample rate supported
recorder = new AudioRecord(MediaRecorder.AudioSource.MIC, rate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSize);
if (recorder.getState() != AudioRecord.STATE_INITIALIZED) {
recorder.release();
} else {
break;
}
}
}
In the Galaxy the state is 0.
What can be the reason for it?
we need recording should be done in a manner that records and overwrites the exiting recording so it will always provide the last X minutes as defined in the app settings.
int bufferSize = 2 * AudioRecord.getMinBufferSize(RECORDER_SAMPLERATE,
RECORDER_CHANNELS, RECORDER_AUDIO_ENCODING);
recorder = new AudioRecord(MediaRecorder.AudioSource.MIC,
RECORDER_SAMPLERATE, RECORDER_CHANNELS,
RECORDER_AUDIO_ENCODING, bufferSize);
recorder.startRecording();
int b = recorder.getState();
if (b == 1)
recorder.startRecording();
in my application, I need to direct sound from microphone directly to speaker. No other actions.
I found a way to direct sound from microphone to earpiece by playing a file and setting speaker off. So I guess speaker can work similarly. However I don' know how to get rid of the playing file thing. Thank you.
speaker() {
m_audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
m_audioManager.setSpeakerphoneOn(true); // not needed I think
//m_audioManager.setRouting(AudioManager.MODE_NORMAL, AudioManager.ROUTE_EARPIECE, AudioManager.ROUTE_ALL); earpiece need this?
setVolumeControlStream(AudioManager.STREAM_VOICE_CALL);
m_audioManager.setMode(AudioManager.MODE_IN_CALL);
use AudioRecord & AudioTrack to record & play (change to ..._MUSIC if speaker needed
static final int bufferSize = 200000;
final short[] buffer = new short[bufferSize];
short[] readBuffer = new short[bufferSize];
public void run() {
isRecording = true;
android.os.Process.setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
int buffersize = AudioRecord.getMinBufferSize(11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT);
arec = new AudioRecord(MediaRecorder.AudioSource.MIC, 11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, buffersize);
atrack = new AudioTrack(AudioManager.STREAM_VOICE_CALL, 11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT, buffersize, AudioTrack.MODE_STREAM);
atrack.setPlaybackRate(11025);
byte[] buffer = new byte[buffersize];
arec.startRecording();
atrack.play();
while(isRecording) {
arec.read(buffer, 0, buffersize);
atrack.write(buffer, 0, buffer.length);
}
}