Android :: Microphone Access / Audio Processing And Recording Simultaneously

Mar 8, 2010

Is it only possible for one object to access the microphone at a time? That is, could I simultaneously use an AudioRecord to do some audio processing and use a MediaRecorder to record the incoming audio?

Android :: Microphone Access / Audio Processing and Recording Simultaneously


Android :: Processing Raw Audio Data

Apr 10, 2009

I want to develop an app that lets one intercept raw audio data sent for playback (possibly by a different app), and apply audio enhancements over this raw data.Does Cupcake allow such filtering of audio data? If so, which API should I use? I understand this may not be possible at an application level for security reasons.I'm trying to see if this is possible with native code linking to public or private API of Android.

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Android :: Audio Programming / Sound Processing And DSP

Jun 23, 2010

The application allowed its users to control the volume of the artist; even mute it.How is this possible?Does adjusting artist sound/setting equalizer etc. mean performing some transformation of required frequencies? What sort of mathematics is required here(frequency domain transformations)?The application recorded users voice input via a mic. Assuming that the sound is recorded in some format, the application was able to mix the recording with the karaoke track(with artists voice muted). How can this be done?Did they play both the track and voice recording simultaneously? Or maybe they inserted additional frequency(channel?) in the original track, maybe replaced it?What sort of DSP is involved here? Is this possible in Java, Objective C?

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Android :: Real Time Audio Processing

Feb 13, 2010

I'm trying to figure out how to write an app that can decode audio morse code on the fly. I found this document which explains how to record audio from the microphone in Android. What I'd like to know is whether it's possible to access the raw input from the microphone or whether it has to be written/read to a file.

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Microphone Stops Recording When Screen Times Out

Mar 31, 2012

I'm writing an app part of whose functionality is to record audio through the microphone. The recording seems to stop as soon as the screen times out and the phone enters what I think is sleep mode. I've noticed that some apps(Tokasiki's Voice Recorder, for one) don't seem to have this problem on this phone(Motorola Atrix) and continue to record audio long after the screen has faded to black. I've tried using a partial wake lock but it doesn't seem to maintain the recording. Should I use AudioRecord instead of MediaRecorder? Voice Recorder seems to get by without using AudioRecord.

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General :: Motorola Atrix - Microphone Stops Recording When Screen Times Out

Mar 31, 2012

I'm writing an app part of whose functionality is to record audio through the microphone. The recording seems to stop as soon as the screen times out and the phone enters what I think is sleep mode. I've noticed that some apps(Tokasiki's Voice Recorder, for one) don't seem to have this problem on this phone(Motorola Atrix) and continue to record audio long after the screen has faded to black. I've tried using a partial wake lock but it doesn't seem to maintain the recording. Should I use AudioRecord instead of MediaRecorder? Voice Recorder seems to get by without using AudioRecord.

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Sony Ericsson Xperia X10 :: Camera Recording Sound Levels / External Microphone

Oct 23, 2010

Is there any way to control and adjust the sound level when recording video? I recently took a video at a concert and the sound is clipping really bad. I also tried to connect various external microphones to the phone but then I only get statics / clicking noises.

Is it possible to connect an external microphone to the phone? (except for the one from the hands free set). Especially with the coming HD video recording feature for the X10 the sound quality really doesn't measure up to the video quality.

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Android :: Can We Get Raw Audio Off Microphone Using Droid

Nov 23, 2009

I've read a lot of posts in this group regarding raw audio processing. Most of them include references by Mr. Sparks about support for this in "future releases". I hope maybe he was referring to Android 2.0? To be clear, all I want to do is obtain audio data from the microphone in as high a fidelity as possible to perform DSP against it. This is blissfully outside the realm of any DRM-laden audio output issues (I hope).

So, in short, can we get raw audio off the microphone using Android 2.0 and a Droid, for example?

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General :: Get Working Steaming Audio To Wireless And Wired Headphones Simultaneously?

Nov 2, 2013

is that possible (at least theoretically) to get working steaming audio to wireless and wired headphones simultaneously [Android 4]? It doesn't matter, if you steam the whole system sound or just sound of single program (for example music player). The idea is to get audio output on 2 devices at the same time. If that is not possible, can confirm possibility to steam audio using A2DP to 2 separate headsets? I've met some old devices (for example samsung cell phones on their own OS) which allowed to select multiple bluetooth devices as clients and steam music from the player simultaneously to multiple headsets.

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Android :: Modify Audio Recorded With Microphone?

Sep 28, 2010

How do i get access to the audio recorded by the microphone before it is accessed by the other applications.

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Android : Way To Loop An Audio Through Microphone In Droid?

Oct 20, 2010

Is there anyway in android to loop a recorded audio through microphone. I mean that instead of speaking in microphone, i should be able to send a recorded audio from code into it.

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Android :: Record Audio Uncompressed / Want To Record Audio From Microphone

Jan 17, 2010

I have searched the whole group but wasn't able to find a answer for my problem.I want to record audio from the microphone, apply some audio signal processing and than save the processed audio data in a compressed format.I figured out, how to record audio uncompressed but now I wonder if I can use some api functions to store this data in a supported compressed format.

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Android :: Voice Calls Uses Its Own Audio Instead Of Build In Microphone

Apr 22, 2009

we're a group of students and trying to implement some kind of voice cryptography over a gsm connection (without modifing any gsm related codecs, we render pure audio which gets transmitted via gsm). Is it possible to initiate a voice call and transmit our generated audio signal (means bypassing the microphone as the primary audio source for that call)? I write this because I'm slightly worried after reading some posts on this list/group which states that the android.telphony APIs are private and can't be called from processes outside the the telephone subsystem.

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Android :: App That Can Record Digital Audio From Microphone Input?

Jun 19, 2010

1st. Are our phones (HTC Incredible) capable of digitally recording audio from a mic? For example, can I plug a microphone into the 3.5mm jack and start recording the audio. (given the hardware is capable) Which leads me to my next question, if so, is there an app for it? I searched and searched but couldn't find much info on it...

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Android :: Inject Audio To Microphone Source During A Call?

Sep 29, 2009

Is possible to inject audio such as mp3 in the output of microphone streaming? I've found an application : spoofApp that change the voice during a call. How is possible?

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Android :: Get Volume Of Audio Stream Coming In Through Droid Microphone?

Oct 13, 2010

How can I get the volume of the audio stream coming in through the android microphone?

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Android : Determine Audio Frequency Of Sound Received Via Microphone

Oct 11, 2010

I am trying to understand how to go about determining the frequency of various sounds captured on the phone via microphone. I am attempting to display a graph plotting the frequency of the note.

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Android :: Poor Audio Quality Captured From Microphone With MediaRecorder / Implement Them?

Aug 11, 2009

I've implemented "Audio Capture Setup and Start" example (http:// developer.android.com/guide/topics/media/index.html) with small modification - the output format is MPEG_4 not THREE_GPP.

The result - records with extremely poor audio quality.

Could you help me to understand where is error and how is possible to do really good audio records with Android?

I've done an experiment with Camcorder - standard Android application. Sound quality of the video is same poor. The audio signal is extremely low (quite).

Is it "by design" or may be some hardware problem (T-Mobile G1)?

I've found description similar problem here - http://osdir.com/ml/AndroidDevelopers/2009-06/msg00752.html - "Microphone audio capture with emulator is of very poor quality". In my case this problem reproduces on the real device. Unfortunately I have not found answer. I read about some "custom" encoders.. but have not found any example how implement them.

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Android :: Microphone Audio Capture With Emulator Is Of Very Poor Quality / Make It High?

Jun 2, 2009

As a first step toward a speech recognition project, we wrote a simple voice recording application based on the information in this thread: http://groups.google.com/group/android-developers/browse_thread/threa...

It is working; however, the audio is extremely poor -- too staticy for our needs code...

As a comparison, here is a similar audio file captured with audacity on a PC: http://juzzam.org:9090/myAudioFile_onPC.mp3

Has anyone been able to record high quality audio with the emulator? If not, is it any better on the android dev phone?

According to the documentation of MediaRecorder, there is only one audio encoder "AMR (Narrowband) audio codec" and three output formats--3gpp, mpeg, and raw AMR: http://developer.android.com/reference/android/media/MediaRecorder.html

Here is the Activity source: http://juzzam.org:9090/RecordMicrophone.java.txt

We are testing on Windows XP, with a Logitec USB microphone, eclipse ganymede, and we are using all the defaults for an android 1.5 app (no emulator command-line options.. we defined the sdcard in the avd manager).

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Android :: Recording Audio With 1.5 SDK

Apr 16, 2009

One known limitation of SDK 1.1 was that audio can be recorded only to a File and not to a network stream. Is this still an issue with 1.5 SDK?

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General :: How To Record Audio Via Bluetooth Headset Not Phone Microphone

Jan 25, 2013

I have a Galaxy Note 2 and can't figure out how to record via my bluetooth headset not via the phone mic. Tried 20+ apps that record great via the phone mic but not via my headset.

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Android :: Create Audio Recording?

Feb 24, 2009

I'd like to create an audio recording in Android. (Actually, I just want access to the mic without recording it, but it seems that's not supported so I'll have to create a recording and tail the file). I'm having a very hard time getting started. Mostly I'm just hoping that someone from Google reads this and will update the documentation because the example won't compile - it looks like it's from some previous version of the SDK because there's an error in every other line. I made my best guess as to what the usage should be, but I keep getting a number of different exceptions. One question I had is whether I can just specify an arbitrary path to the MediaRecorder to start recording or whether I have to create an entry in the content database. The JavaDoc for MediaRecorder.setOutputFile isn't clear on what it's expecting.

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Android :: Audio Playback Error While Recording

Oct 16, 2009

I have a Java application where in I am trying to read Audio samples from the mic into a buffer and then write the samples back to speaker from a buffer for playing. I have used AudioRecord and AudioTrack interfaces. Below are my configurations for the Record and Track object creation. AudioTrack(0, 8000, 2, 2, playBufSize, 1); AudioRecord(1, 8000, 2, 2, recBufSize); Using AudioRecord interface I am able to read the samples from mic continiously (8000 sampling rate and 640 samples per read). In the similar way I am also able to write some pcm samples to the speaker from a buffer and play it continuously using the AudioTrack interface (without record). But when I try to do both record and play simultaneously I am able to only record audio from mic but I am not able to play any samples to speaker. I am getting this error " ------- attemp playback while recording, cheat it! ----- " in the log cat.

I have given the following permissions "android.permission.RECORD_AUDIO" and "android.permission.MODIFY_AUDIO_SETTINGS" in the Manifest file. I didn't find any special permission to play the audio. Is there anything else that I need to enable?

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Android :: Audio Recording From Bluetooth Headset?

Apr 9, 2009

I am developing a recorder application It works fine with Microphone. I want to record from Bluetooth headset. I set it like

my_Aud_Mgr.setMicrophoneMute(true);
//AudioManager my_Aud_Mgr;
my_Aud_Mgr.setBluetoothScoOn(true);

But it cant record from Bluetooth device. How to record from Bluetooth device.

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Android :: Audio Recording With High Volume

Sep 7, 2009

I will describe briefly my trouble with audio recording.

So, I am doing audio recording using MediaRecorder, but unfortunately when I playback the recorded audio, I have media with a very low volume. I don't here anything (almost anything).

Is there any possibility to setup recording volume?

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Android :: Recording Direct System Audio?

Nov 9, 2009

Im trying to record audio directly from the system. Using the standard API, you can only record from the MIC or phonecalls, ala: MediaRecorder.Some ways I've tried is to read from /dev/audio and /dev/eac from my app, but I think the sandbox of the app is preventing this.Im thinking about using the NDK, but Im not sure if that would overcome the sandbox aspect ? Ideally, there is some solution outthere to access the audio sub- system directly. Whether it be directly to alsa, to the AudioFlinger, to /dev/eac

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Android :: Write App To Continuous Audio Recording In Memory

Jan 6, 2010

I'm trying to write an App that continuously record audio in memory (in a circular buffer).

Could anyone point me towards a piece of code (perhaps in the kernel) that shows how to best to this?

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General :: Extracting Audio From Android Game Or Recording It Somehow Possible?

Jul 7, 2013

I just finished Final fantasy 4 (android), and I wanted to have the remastered soundtracks from it. But on the internet the remastered version is not available yet, I could only find the old soundtracks.

I tried screencast recorder, z screen recorder etc(to record video+audio then extract audio), but they all record audio from the microphone, so that didn't work out. is there a way to extract the audio from the game somehow, or some on screen audio recorder for android devices?

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Android :: Bad Sound Quality When Recording / Playing Audio Files

Oct 16, 2010

Hey, I have a problem with android programing when I try to record and then play the file that was just recored. I can both record and play the sound but the quality stinks. Its not just bad is really hard to listen to and sound abit like its a computer generated voice. I use the andriod SDK-emulator. The code that sets up the recording looks like this;

MediaRecorder recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setOutputFormat(MediaRecorder.OutputFormat.RAW_AMR);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setOutputFile(path);
recorder.prepare();
recorder.start();

And the code playing the file later looks like this;
MediaPlayer mp = new MediaPlayer(); mp.reset();
mp.setDataSource(path); mp.prepare(); mp.start();
I don't know what part that makes the audio file sound really bad or if its just the emulator that makes it bad and that it would work on a real phone.

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Android :: Tying To Develop An App For Audio Video Recording On Phone

Dec 21, 2009

I am trying to develop an app which streams live audio/video. I have the mediarecorder to record both audio, video frames , and it does so. But the thing is it records a chunk of audio and then records a chunk of video frames and then records a chunk of audio frames to the file. How do I determine where my audio frames start and where the video frames start?. Also is there any way to figure out the Video frame length ?. Iam really stuck at this point and any help will be greatly appreciated. This is how I initialize the mediarecorder in my app, Code...

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