Thanks Mike, Your a legend, have that working now,
I owe you a pint! Many thanks, Regards, Donal On Thu, Jan 21, 2010 at 5:02 PM, Michael <[email protected]> wrote: > Hi Donal, > > I have pulled together some of my code to form an example. I have no > idea if this code would compile, but it should be pretty close and > should serve as an example to get you going. > > > > android.os.Process.setThreadPriority > (android.os.Process.THREAD_PRIORITY_URGENT_AUDIO); > > int buffersize = AudioRecord.getMinBufferSize(11025, > AudioFormat.CHANNEL_CONFIGURATION_MONO, > AudioFormat.ENCODING_PCM_16BIT); > > AudioRecord arec = new > AudioRecord(MediaRecorder.AudioSource.MIC, > 11025, > AudioFormat.CHANNEL_CONFIGURATION_MONO, > AudioFormat.ENCODING_PCM_16BIT, > buffersize); > > AudioTrack atrack = new > AudioTrack(AudioManager.STREAM_MUSIC, > 11025, > AudioFormat.CHANNEL_CONFIGURATION_MONO, > AudioFormat.ENCODING_PCM_16BIT, > ba.size(), > AudioTrack.MODE_STREAMING); > > atrack.setPlaybackRate(11025); > > byte[] buffer = new byte[buffersize]; > arec.startRecording(); > atrack.play(); > > while(isRecording) { > arec.read(buffer, 0, buffersize); > try { > atrack.write(buffer, 0, buffer.size()); > } catch (IOException e) { > > e.printStackTrace(); > } > } > > arec.stop(); > atrack.stop(); > > This sets up an AudioRecord and an AudioTrack, tells the one to record > and the other to play. You then have the while loop which reads the > data out of the record and writes it to the play. This should > reproduce the microphone audio as output for you (the code above will > most likely put it out the speaker, play with the stream in the > AudioTrack constructor for earpiece). > > You will need to run this code on a seperate thread and control the > lifetime of the thread using the isRecording boolean. > The first line elevates the thread to a higher priority, this may or > may not be correct, so you should play with it and see. > As for your delay, you may need to increase your buffer sizes to hold > a few seconds worth of data and then just write the data to the > AudioTrack later to create the delay. > > Oh and watch for feedback if the sound does come out of the speaker as > it can be exponential if it's loud. You can always call: > > setVolumeControlStream(AudioManager.STREAM_MUSIC); > > from your activity and just make sure you pass the same stream as the > one you pass to AudioTrack and your volume control will control the > volume of that stream, enabling you to turn it down ;-) > > Hope that helps, > Mike > > On Jan 21, 3:49 pm, Donal Rafferty <[email protected]> wrote: > > Really sorry to keep annoying you Micheal, head just doesn't seem to be > > functioning properly today. > > > > I currenlty have the AudiRecord buffer set up like this: > > > > static final int bufferSize = 80000; > > final short[] buffer = new short[bufferSize]; > > short[] readBuffer = new short[bufferSize]; > > > > File file = new File(Environment.getExternalStorageDirectory > > ().getAbsolutePath() + "/record.pcm"); > > > > OutputStream os = new FileOutputStream(file); > > BufferedOutputStream bos = new BufferedOutputStream(os); > > DataOutputStream dos = new DataOutputStream(bos); > > > > So that sets up to buffer to the file record.pcm and the > AudioRecord.read() > > methos is as follows: > > > > int bufferReadResult = audioRecord.read(readBuffer, 0,bufferSize); > > > > for (int i = 0; i < bufferSize; i++) > > buffer[i] = readBuffer[i]; > > for (int i = 0; i < bufferReadResult; i++) > > dos.writeShort(buffer[i]); > > > > So it ends up reading to the file that way, so instead of the > OutputStream > > os being set > > to a FileOutputStream do I set it to something else? and then add the > > OutputStream to > > a BufferedOutputStream and then that to DaraOutPutStream? > > > > Or does buffer[i] hold exactly what I need and I just need to get whats > in > > buffer[i] to > > the AudioTrack? > > > > Thanks again and sorry to be so much hassle > > > > On Thu, Jan 21, 2010 at 3:19 PM, Michael <[email protected]> > wrote: > > > Hi Donal, > > > > > Once you have constructed an AudioRecord instance you can call > > > startRecording and then you can use the various read methods to pull > > > the PCM data out. > > > Likewise once you have constructed an AudioTrack and called play you > > > can use one of the write methods to push the data you got from > > > AudioRecord into the play buffer. > > > > > Mike > > > > > On Jan 21, 3:12 pm, "[email protected]" <[email protected]> wrote: > > > > Hi Micheal, > > > > > > Thanks again, > > > > > > I now have it recording in PCM format from the mic and saving it to > > > > the sd card and then > > > > playing it back through the ear piece. > > > > > > So I just have to look into how to into piping the AudioRecord > > > > straight into the AuditTrack. > > > > > > So with the AudioRecord instead of creating a file to save to what > > > > should I look into doing? > > > > > > And with the AudioTrack, instead of looking for a file to read in > what > > > > should I look into doing? > > > > > > Thanks, > > > > Kind Regards, > > > > Donal > > > > > > On Jan 21, 1:10 pm, Michael <[email protected]> wrote: > > > > > > > Hi Donal, > > > > > > > Yeah if you kick the record off and the play, then you can sit in a > > > > > loop reading the data out of Record and putting it into play (on a > > > > > thread other than the UI thread of course). > > > > > > > Not 100% sure about the earpiece, but you specify a stream when you > > > > > create the AudioTrack and I think a stream encpsulates audio > routing > > > > > and volume amongst possibly other things. > > > > > > > If you set the stream to STREAM_VOICE_CALL it might come through > the > > > > > earpiece as this is where a call would be routed, although I guess > > > > > that depends on headsets and stuff. > > > > > > > Can anyone clarify if I am right? > > > > > > > Mike > > > > > > > On Jan 21, 11:49 am, "[email protected]" <[email protected]> > wrote: > > > > > > > > Hi Mike, > > > > > > > > Thanks for the prompt reply. > > > > > > > > I was looking at the AudioRecord class but had somehow missed the > > > > > > AudioTrack class, > > > > > > > > thanks for pointing it out. > > > > > > > > From looking at the classes I think what I have to do is read the > > > > > > recording data and put it straight into a streamed > > > > > > AudioTrack, would I be correct in saying that? > > > > > > > > And then is it possible to send it to the earpiece? > > > > > > > > Thanks again, > > > > > > > > Donal > > > > > > > > On Jan 21, 11:36 am, Michael <[email protected]> wrote: > > > > > > > > > AudioRecord and AudioTrack are the classes you need. > > > > > > > > > If you use them in streaming mode then you can pipe data out of > > > > > > > AudioRecord straight into AudioTrack and you should be able to > > > acheive > > > > > > > the desired effect. > > > > > > > > > I have done something similar, but without the delay. > > > > > > > > > Mike > > > > > > > > > On Jan 21, 11:28 am, "[email protected]" <[email protected]> > > > wrote: > > > > > > > > > > Hi all, > > > > > > > > > > I was wondering is it possible with Android to record from > the > > > mic and > > > > > > > > play the sound back out the earpiece with just a 1 second > delay? > > > > > > > > > > I have seen the tutorials and can currently record from the > mike > > > and > > > > > > > > save a 3gp file to the sd card. > > > > > > > > > > However is it posssible to record and say stream the audio > > > straight to > > > > > > > > the ear piece with just a 1 - 2 second delay? > > > > > > > > > > If so how would I go about doing this? > > > > > > > > > > Would I need to record from the mic and save it to a file and > > > then > > > > > > > > repaly to the ear piece? and continually do this? > > > > > > > > > > Or would it be possible to record from the mic and stream it > > > directly > > > > > > > > to the ear piece with just a slight delay? > > > > > > > > > > Any help, info or directions to tutorials would be greatly > > > > > > > > appreciated, > > > > > > > > > > Thanks in advance > > > > > -- > > > You received this message because you are subscribed to the Google > > > Groups "Android Developers" group. > > > To post to this group, send email to > [email protected] > > > To unsubscribe from this group, send email to > > > [email protected]<android-developers%[email protected]> > <android-developers%[email protected]<android-developers%[email protected]> > > > > > For more options, visit this group at > > >http://groups.google.com/group/android-developers?hl=en > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected]<android-developers%[email protected]> > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en >
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