First off, thank you for you attention and your help!
I´ve been trying to create a simple application to learn how android
handles audio streams for computer music and digital audio processing
applications.
Before I start coding I´ve read a lot of material (threads and
tutorials) about AudioRecorder so I could find my way but
unfortunately I´m facing a problem that neither google search can find
recurrencies. Believe it or not! hehehe
Here is the deal ...
When my application tries to create a new object from AudioRecorder I
get 3 error messages (Logcat):
03-07 02:58:43.048: ERROR/AudioRecord(371): Could not get audio input
for record source 1
03-07 02:58:43.048: ERROR/AudioRecord-JNI(371): Error creating
AudioRecord instance: initialization check failed.
03-07 02:58:43.109: ERROR/AudioRecord-Java(371):
[ android.media.AudioRecord ] Error code -20 when initializing native
AudioRecord object.
Here is the code I´m using for creating a new AudioRecorder object:
//-------------------------------------------
package com.examples.audio;
import android.app.Activity;
import android.media.AudioFormat;
import android.media.AudioRecord;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
public class main extends Activity {
/** Called when the activity is first created. */
private TextView tvGravacao;
private AudioRecord audioRecord;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tvGravacao = (TextView) findViewById(R.id.tvGravacao);
int BUFFER_SIZE = AudioRecord.getMinBufferSize(8000,
AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT);
audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC,
SAMPLE_RATE,
AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT,
BUFFER_SIZE);
}
//-------------------------------------------------------
Does anyone have an idea of what could cause this error? My AVD has
been set up to handle audio input and output, I have recreated it
twice, have tried adding a permission in AndroidManifest.xml but none
of them solved my problem.
I hope someone has figured this out before.
Thanks,
Gabriel Simões
things I have noticed: sample rate must be 8000 and audioformat must
be ENCODING_PCM_16BIT. SR = 44100 or AF = 8 bit crashes app when
running AudioRecord.getMinBufferSize();
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