News, but no good news... I´ve tried the source code above on another machine running the sdk 2.1, an AVD with default parameters plus audio record and audio playback capabilities, another operational system (linux), etc. The results? the same we had before .... audio delay (long delay), chopping, distortion and a metalic voice.
I can not believe nobody here in this forum hasn´t been able to develop any app that can record from the microfone using AudioRecord. Also, anyone here hasn´t even made a loop back from microfone to line out to check the audio being recorded? Please, c´mon guys ... this is not a commercial secret, this won´t increase competition, and I really can´t see any other reasons not to see some posts from developers who work with audio or other signal processing using Android. Please, show us a way to go because I´ve tried almost all the possibilities here (the only one left is to try using a real device) and revising the code I can´t find what else it could be. *Obs: once again, a program with a thread only to read from AudioRecord and play with AudioTrack is giving warnings about buffer overflows (Audio Record). There´s no processing going on and since I haven´t found anything related to "AudioTrack.play() blocks until the audio stream is played", based on it´s actuall behavior in my app I can ´t see how this class could be useful for online audio processing applications. Thank you, Gabriel On 15 mar, 20:53, Gabriel Simões <gsim...@gmail.com> wrote: > Well, just to try I´ve downloaded the SDK 1.6 (v. 4), created a new > AVD based on that and then tried the source code from the first post > in two different situations: > > - App compiled using SDK 1.6 on an AVD running 1.6 > - App compiled using SDK 1.6 on an AVD running 2.1 > > Had exactly the same results as "compiling" and running on 2.1: audio > chopping, distortion and artfacts even if I solo the microfone input > level (using a 1 second buffer, sometimes the audio decays in a lot > longer) and AudioRecord buffer overflow messages even if all I do in > the thread is to read from AudioRecord and to play using AudioTrack. > > Tomorrow I will try to test my code using another computer and even > on > a real device. In the mean time, any other ideas? > > Gabriel > > On 15 mar, 01:31, HeHe <cnm...@gmail.com> wrote: > > > > > no chopping, likely because my computer (Core2 E8400) is lightening > > fast. > > > my AudioRecord.read() returns a value equal to my buffer size, too. > > > however, it returns recorded samples in a speed "faster than 8khz", > > which makes later playback sound like my voice is slowed. > > > again, the same code works correctly on 1.5 emulator. > > > so, seems your problem is not the same as mine :( > > > On Mar 14, 6:53 pm, Gabriel Simões <gsim...@gmail.com> wrote: > > > > Audio chopping also? > > > Could you please test the code above? > > > > I´ve checked and AudioRecord.read() returns a value equal to my buffer > > > size. Based on that I understand that AudioRecord.read() blocks the > > > execution, waits for the buffer to get a number of samples at least > > > equal to the buffer size and then it returns the audio stream (older > > > "buffer size" number of samples in the AudioRecord internal buffer). > > > > On 14 mar, 22:34, HeHe <cnm...@gmail.com> wrote: > > > > > seems i am experiencing similar issue as you > > > > r.http://groups.google.com/group/android-developers/browse_thread/threa... > > > > > without any single line of code modification to my app, the count of > > > > frames recorded by app running on sdk 1.6 emulator is significantly > > > > more than that recorded by the same app running on sdk 1.5 emulator. > > > > > however, the same app runs equally well on both 1.5/1.6 emulators. > > > > > it is weird..... > > > > > On Mar 14, 3:00 pm, 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- Ocultar texto das mensagens anteriores - > > > > > - Mostrar texto das mensagens anteriores -- Ocultar texto das mensagens > > > > anteriores - > > > - Mostrar texto das mensagens anteriores -- Ocultar texto das mensagens > > anteriores - > > - Mostrar texto das mensagens anteriores - -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
