Ops, sorry for the title. Should be audio chopping from AudioRecord to
AudioTrack.
On 14 mar, 19:00, Gabriel Simões <gsim...@gmail.com> wrote:
> Hello,
>
> Since my day 1 I´ve been facing problems with Android AudioRecord API.
> After a lot of research and a lot more trial and error I´ve found my
> way into the code and was able to write an asynctask for audio streams
> recording which encapsules most of the audiorecord and asynctask
> features as a lib, so the developers doesn´t need to worry about
> finding the best audio parameters, work on stop and release, etc.
> So far, everything was right.
> Yesterday I started trying to process the audio I got from the
> microfone input and my code was reacting bad. I revisited it many
> times and decided then to check the audio I was getting from the mic.
> Created in instance of AudioTrack and tried to play it back. The sound
> was horrible, with lots of chopping, lots of distortion and giving me
> even the sensation of low samplerate playback (a single word spoken
> sometimes lasted for seconds on the earphone).
> To check if it was actually my code I went for the internet and found
> the code above. Tried it and got the same results. The only thing that
> comes to my mind actually is that, it doesn´t matter what I do and the
> configuration I try, I always get the buffer overflow message. Even if
> I don´t actually do anything but read from AudioRecord and write to
> AudioTrack (example above, and not in debug mode). If the emulator can
> ´t do it fast enought .... then I´m completly lost here.
>
> Based on the output of my algorithm I think the audio streams I´m
> reading are not right.
>
> Have anyone faced this? does anyone know how to solve it? Could anyone
> try the code (copy and paste) and check if it´s actually my computer
> or my emulator?
>
> package com.example.test;
>
> import android.app.Activity;
> import android.content.Context;
> import android.media.AudioFormat;
> import android.media.AudioManager;
> import android.media.AudioRecord;
> import android.media.AudioTrack;
> import android.media.MediaRecorder;
> import android.os.Bundle;
>
> public class test extends Activity {
>
> boolean isRecording; //currently not used
> AudioManager am;
>
> /** Called when the activity is first created. */
> �...@override
> public void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
> setContentView(R.layout.main);
> am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
> Record record = new Record();
> record.run();
>
> }
>
> public class Record extends Thread
> {
> // SoundPower sndPower = new SoundPower();
>
> 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(8000,
> AudioFormat.CHANNEL_CONFIGURATION_MONO,
> AudioFormat.ENCODING_PCM_16BIT);
> buffersize = 2048;
>
> AudioRecord arec = new
> AudioRecord(MediaRecorder.AudioSource.MIC,
> 8000,
>
> AudioFormat.CHANNEL_CONFIGURATION_MONO,
>
> AudioFormat.ENCODING_PCM_16BIT,
> buffersize);
>
> AudioTrack atrack = new
> AudioTrack(AudioManager.STREAM_VOICE_CALL,
> 8000,
>
> AudioFormat.CHANNEL_CONFIGURATION_MONO,
>
> AudioFormat.ENCODING_PCM_16BIT,
> buffersize,
>
> AudioTrack.MODE_STREAM);
>
> atrack.setPlaybackRate(8000);
>
> byte[] buffer = new byte[buffersize];
> arec.startRecording();
> atrack.play();
>
> while(isRecording) {
> arec.read(buffer, 0,
> buffersize);
> atrack.write(buffer, 0,
> buffer.length);
> }
>
> arec.stop();
> atrack.stop();
> isRecording = false;
> }
> }
>
> }
>
> This code is not mine. I´ve just cut and replaced some values (as the
> SampleRate) so it would work.
>
> My specs:
>
> AndroidOS 2.1, last emulator and package (downloaded one week ago).
> Dell Vostro 1000 (onboard soundcard), windows XP SP3.
>
> Thank you very much,
> Gabriel Simões
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