Android :: NexusOne AudioRecord Randomly Goes To Standby

May 9, 2010

On the nexus one, my app goes into Audio Record Stanby randomly after 0-40 seconds. I'm using the AudioRecord class, and while the standby is reported in the terminal, the AudioRecord instance reports the same states of RECORDSTATE_RECORDING and STATE_INITIALIZED throughout the entire sequence.

The bottom line is that when this anomaly occurs, audio is not captured. and this is what im working to prevent was only able to reproduce on nexus one android2.1 not g1 android1.6

I have looked extensively through the Android C/C++ libraries such as at this file: http://android.git.kernel.org/?p=platform/hardware/msm7k.git;a=blob_p... and [url]

Most interesting to me, is this line in AudioFlinger: [url]

Specifically the bool AudioFlinger::RecordThread::threadLoop()

As you can see, minput->standby() occurs in 4 different places in the code.

Android :: NexusOne AudioRecord Randomly goes to standby


Samsung Vibrant :: When On Sleep/standby Mode Will Randomly Flash On

Sep 25, 2010

Just bought a Vibrant off of CL. I got it unlocked and it seems to be running well off of AT&T. I had a few questions though.

1) Whenever it is in the sleep/standby mode it will randomly flash on. I won't get any new emails or txt messages but it does stay on for a while until the screen timeout period ends

2) It does display a "Refreshing SIM data" message at the bottomish area every few minutes. Is this normal or is this an AT&T thing...

3) I was able to reset everything from going to the Settings>privacy>factory data reset but the instructions for a hard reset of "turning on the phone while holding down the volume down button" did not work. Has anyone been able to pull this off?

All in all I'm pretty jazzed about the phone. I like the Swype typing a lot as well as the overall speed and app installs. I'm coming from a work iPhone and an old school bar phone that could only call and txt. My wife has a iPhone4 and even though the facetime feature is nice I still don't like the restrictiveness of Apple products.

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Android :: Difference In Behavior Between HTC / NexusOne / SDK 2.1-update1

Jun 7, 2010

I wrote an app that invokes the contact manager in the following way: Intent pickcontact = new Intent(Intent.ACTION_PICK, People.CONTENT_URI); startActivityForResult(pickcontact, CONTACTPICKED); I am experiencing 2 different behavior between HTC phones and the NexusOne, all with firmware 2.1-update1. (i.e., my application is getting access to all my contact along the primary phone number of that contact list). On HTC phones however (incredible and the hero), the list of contact I get represents some sort of index as opposed to the actual contact name/phone number.

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Android :: Using AudioRecord API

May 15, 2009

I'm trying to figure out how to use the AudioRecord class.I created a callback with a logging message, but don't ever see it called.Do you see anything wrong with what I'm doing? Do you have an example of how to use the API?

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Android :: How To Use AudioRecord And AudioTrack?

Apr 30, 2009

I want to use AudioRecord and AudioTrack classes(in SDK 1.5) in my program. Where can I find how to use it. Is there any API demo program for this?. If not it is greatly appreciated if someone can post a sample code in this forum.

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Android :: Synchronizing AudioTrack And AudioRecord

Jan 21, 2010

My application uses AudioTrack in streaming mode and AudioRecord simultaneously.My problem is that I start them at the same time, but I have no guarantee that they will actually start playback ecording in the same timestamp. The reason I need this kind of accuracy is because I use echo cancellation (subtracting audio played to speaker from the recording).My echo canceller doesn't require an exact delay, but the delay introduced between AudioTrack and AudioRecord moves in the range of 250ms (between different runs), and that's too much - each run is different because they start themselves asynchronously. The API doesn't provide me a way to make sure they start in the same time, so I thought about measuring this starting delay somehow and then using it in my calculation.Does anyone have an idea how to do that, utilizing their API or in any other way?

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Android :: How To Add Own Audio Codec To AudioRecord?

Mar 10, 2010

I currently have a Loop back program for testing Audio on Android devices.It uses AudioRecord and AudioTrack to record PCM audio from the Mic and play PCM audio out the earpiece. So as you can see in the creation of the AudioTrack and AudioRecord the Encoding is supplied via the AudioFormat but this only allows 16 bit or 8 bit PCM.I have my own G711 Codec implementation now and I want to be able to encode the audio from the Mic and decode it going into the EarPiece, So I have encode(short lin[], int offset, byte enc[], int frames) and decode(byte enc[], short lin[], int frames) methods but I'm unsure as to how to use them to encode and the decode the audio from the AudioRecord and AudioTrack.

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Android :: AudioRecord Is Not Working On Emulator

Nov 11, 2010

I used AudioRecord on emulator and phone. I found that AudioRecord is not working on phone: 1> the min-buffer-size on simulator is much smaller than phone 2> The audio data I read from phone is all zero.

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Android :: AudioRecord On Emulator With Frequency 8 KHz

Mar 25, 2010

I'm doing a voice recording using AudioRecord class and the main requirement that the frequency must be 16000 Hz. I'm using only emulator in development process for now and met the problem that I can't set frequency more than 8000, otherwise I get bufferSize -2, and can't create instance of AudioRecord with such buffer. Thank you to Szabolcs Vrbos, he told me that this problem is only with emulator and several Samsung phones, device can record with higher frequency.I need a word from Android engineers that I will be able to record voice with 16000 Hz frequency on for instance HTC Hero (Android 1.5)or similar device with os 1.5 or higher.

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Android :: Relation Between MediaRecorder And AudioRecord?

Apr 1, 2010

the location where the audioflinger, surfaceflinger and cameraservice talk to MediaRecorder's APIs? Is there any relation between MediaRecorder and AudioRecord?

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Android :: AudioRecord On Samsung Moment

Sep 25, 2010

We have been getting reports of audio recording not working on Samsung Moment phones on 2.1-update1.

int bufferSize = AudioRecord.getMinBufferSize(sampleRate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT); this.audioRecord = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_16BIT, bufferSize);

generates these logs: I/AudioPolicyManager( 1889): getInput() inputSource 1, samplingRate 16000, format 1, channels 10, acoustics 0 W/AudioHardwareALSA( 1889): openInputStream : mInput already exists!! E/AudioRecord( 2618): Could not get audio input for record source 1 E/AudioRecord-JNI( 2618): Error creating AudioRecord instance: initialization check failed. E/AudioRecord-Java( 2618): [ android.media.AudioRecord ] Error code -20 when initializing native AudioRecord object. I can't find the "mInput already exists". anywhere in the source base, could this perhaps be an error message included by the OEM?

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Android :: How Can I Get Amplitude Volume / When Recording With AudioRecord?

Apr 6, 2010

How can I get the amplitude/volume when recording with AudioRecord?

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Motorola :: Android AudioRecord Fails To Initialize

Nov 12, 2010

I've been having an issue with using AudioRecord for Android. I've read as much as I can find online about it, but I cannot seem to get a good initialization. I have tried the Android 2.2 emulator, 1.5 emulator and my phone, an HTC Incredible running Froyo. The emulators and my phone fail initialization. I've tried sampling rates of 8000, 11025, and 44100, formats of CHANNEL_IN_MONO/STEREO and CHANNEL_CONFIGURATION_MONO/STEREO, 8bit and 16bit encoding (8 bit makes the getMinBufferSize fail), and Audio Source of MIC and DEFAULT. All result in the variable test becoming 0 after running a get state(failed initialization). It seems from everything I've read that this should correctly initialize the object. I have played around with the multiplier on buflen, to have it range from 512 (the result of the function) to 102400 because I had heard that HTC devices require something above 8192. For testing my problem I made a new, small project that recreates my problem as simply as possible. I pull out the constants needed into local ints then run the constructor and access the getState method for checking if it worked. Code...

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Android :: AudioRecord Producing No Sound Data

Dec 6, 2009

Here is my AudioRecorder class, using audio record, why is it not producing any sound data?

import java.io.FileOutputStream; import java.io.IOException; import android.content.Context; import android.media.AudioFormat; import android.media.AudioRecord; import android.media.MediaRecorder; public class AudioRecorder implements Runnable {public boolean isRecording = false; byte[] tempBuffer = new byte[AudioRecord.getMinBufferSize(44100, AudioFormat.CHANNEL_CONFIGURATION_STEREO,......

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Android :: AudioRecord Class To Analize Raw Pcm Bytes As It Comes In The Mic

May 27, 2010

I am using the AudioRecord class to analize raw pcm bytes as it comes in the mic.

So thats working nicely. Now i need convert the pcm bytes into decibel.

I have a formula that takes sound presure in Pa into db. db = 20 * log10(Pa/ref Pa)

So the question is the bytes i am getting from audiorecorder from the buffer what is it is it amplitude pascal sound pressure or what.

I tried to putting the value into te formula but it comes back with very hight db so i do not think its right

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Android :: Improper Audio Format While Using AudioRecord API / What To Do?

Oct 12, 2010

I am doing recording in following way and storing byte array in a binary file. But the binary file I am getting is not in any format. what can be the problem? code...

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Android :: AudioRecord Class - Callback Is Never Called

Feb 15, 2010

My Android Java Application needs to record audio data into the RAM and process it. This is why I use the class "AudioRecord" and not the "MediaRecorder" (records only to file).

Till now, I used a busy loop polling with "read()" for the audio data. this has been working so far, but it peggs the CPU too much. Between two polls, I put the thread to sleep to avoid 100% CPU usage. However, this is not really a clean solution, since the time of the sleep is not guaranteed and you must subtract a security time in order not to loose audio snippets. This is not CPU optimal. I need as many free CPU cycles as possible for a parallel running thread.

Now I implemented the recording using the "OnRecordPositionUpdateListener". This looks very promising and the right way to do it according the SDK Docs. Everything seems to work (opening the audio device, read()ing the data etc.) but the Listner is never called.

I am working with a real Device, not under the Emulator. The Recording using a Busy Loop basically works (however not satifiying). Only the Callback Listener is never called.

Here is a snippet from my Sourcecode:
CODE:.........................

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Android :: AudioRecord - OnPeriodicNotification And OnMarkerReached Are Not Called

May 13, 2010

I've seen posts regarding problems with the AudioRecord OnRecordPositionUpdateListener, but I haven't seen any real answers.

I'm using AudioRecord to record from the mic, and I want to get the input from the mic periodically so I can check sound levels and update a meter.

I set up the listener like this:

CODE:...........

What happens is that onMarkerReached gets called once, after the recorder is released, so that's not very useful.

Do I need to change the marker position and notification period? Is the listener working? Is there another way to accomplish periodically getting the mic input?

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Android :: Catching AudioRecord Exception When Not Processing Fast Enough

Jun 19, 2009

In the Eclipse log I can clearly see a warning pop up (something about buffer overflow) every time I don't read from the AudioRecord buffer fast enough and consequently miss a chunk of audio samples. Is there any way I can detect that notification programatically so I know exactly when I have missed a chunk?

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Android :: AudioRecord Doesn't Work For Motorola Milestone

May 4, 2010

I'm having this problem only on Motorola Milestone. Code:

CODE:................

The errorinformation I have (can't find more for the moment since I don't have a milestone myself for debugging):

CODE:..........................

Apparantly I'm not the only one with this problem. Some very similar threads I found (without solution):

http://groups.google.com/group/android-developers/browse_thread/thread/6dd24aeb484b2e40
[url]
[url]
[url]
[url]

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Android :: AudioRecord Works With Short But Static With Byte

Jan 8, 2010

Any idea why reading bytes from AudioRecord would cause an error while reading shorts would not? The sound comes through great with short but I get only static with bytes.

Working code with short[]:

CODE:.......................

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Android :: AudioRecord Can't Get Any Notification When Record/marker Position Updated

Apr 23, 2009

hello everyone, I would like to use the new AudioRecord class to record in PCM format. Create class and setRecordPositionUpdateListener to it, then start recording, I can't get any notification from system forever,why?(I didn't get any error when running)

The next is my code.

CODE:.............................

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Media :: System Sleep While AudioRecord Is Recording?

Sep 8, 2009

I am new to Android and has been trying to find out if Android 1.5 on HTC magic is able to put system to sleep while collecting audio data through microphone.

What I am trying to accomplish is to continously collecting audio (PCM 16bit at 8K Hz) from microphone as long as possible. I have tested with AudioRecord class and is able to record audio continously for 7 hours before battery running out. 7 hours is good but not enough.

I noticed that during recording, although screen is turned off automatically, the system is never put into sleep mode. I wish sleep mode will allow recording go much longer. I found out by comparing SystemClock.uptimeMillis() and System.currentTimeMillis() before and after recording.

However as I reviewed David Sparks presentation at Google I/O (Google I/O - Mastering the Android Media Framework). David suggested at the end of the presentation that system should be automatically go to sleep mode while AudioRecord is collecting data into the preconfigured buffer(1 M bytes in my example). There are two problems I was facing while trying a simple recording 8k PCM 16bit using buffer of 1 Mbytes.

1. AudioRecord.setPositionNotificationPeriod() or AudioReocrd.setNotificationMarkerPosition() does not seem to work. I wish to periodically wake up to retrieve data by calling AudioRecord.read().
However, I do not get call back at all as I configured. Eventually AudioRecord stopped when record buffer overflowed. Below is the code.


2. With problem 1, I have to call AudioRecord.read() in a while loop from a separate thread. When I read(), the thread will block on the read() until read buffer is filled. During the block, I hope the system may go to sleep mode. My program works and audio data were successfully read but system never went to sleep during the block.

My idea of putting system into sleep while recording audio continously.

CODE:.........................

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Error Recording Audio Using Native AudioRecord Interface

May 25, 2009

Record audio using the native AudioRecord interface? I'm trying to do this on my Neo Freerunner but all I get in logcat is:

I/AudioHardwareALSA( 787): Initialized ALSA CAPTURE device AndroidRecord_Microphone
D/AudioHardwareALSA( 787): Set CAPTURE PCM format to S16_LE (Signed 16 bit Little Endian)
D/AudioHardwareALSA( 787): Using 1 channel for CAPTURE.
D/AudioHardwareALSA( 787): Set CAPTURE sample rate to 8000 HZ
E/AudioFlinger( 787): Error reading audio input
W/AudioRecord( 947): obtainBuffer timed out (is the CPU pegged?) user=00000000, server=00000000

The android::AudioRecord::read() function returns the number of bytes I'm trying to read, but the resulting buffer is filled with zeroes.

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Android :: Android AudioRecord And AudioTrack Codec Options?

Feb 3, 2010

I currently use the AudioTrack and AudioRecord classes in Android.I use the pure PCM data but I was wondering what my options are for other codecs?From this page it seems I can only encode and decode using AMR narrowband?The code runs properly but I'm wondering does it actually encode the Audio as AMR_NB and if this is not a proper way to do it?I was getting a buffer overflow when using raw PCM but none have appeared since using the new code with the MediaRecorder.AudioEncoder.AMR_NB used instead of the AudioFormat.PCM

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Android :: Android: AudioRecord Class - Callback Is Never Called

Feb 15, 2010

My Android Java Application needs to record audio data into the RAM and process it. This is why I use the class "AudioRecord" and not the "MediaRecorder" (records only to file).

Till now, I used a busy loop polling with "read()" for the audio data. this has been working so far, but it peggs the CPU too much. Between two polls, I put the thread to sleep to avoid 100% CPU usage.

However, this is not really a clean solution, since the time of the sleep is not guaranteed and you must subtract a security time in order not to loose audio snippets. This is not CPU optimal. I need as many free CPU cycles as possible for a parallel running thread.

Now I implemented the recording using the "OnRecordPositionUpdateListener". This looks very promising and the right way to do it according the SDK Docs. Everything seems to work (opening the audio device, read()ing the data etc.) but the Listner is never called.

I am working with a real Device, not under the Emulator. The Recording using a Busy Loop basically works (however not satifiying). Only the Callback Listener is never called.

Here is a snippet from my Sourcecode:

CODE:...............................

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Android :: Standby Clock App?

May 11, 2010

Just got myself a new HTC Incredible.It's my first Android phone, and hell my first smartphone at all, and I'm loving it.One aspect that's kind of bugging me, on previous phones I had, it was very easy to glance at the phone to see what time it is.With the Incredible, the screen shuts off completely when it goes into standby, and I have to press the top button to see the clock.It's not the worst thing in the world, but does anyone know of an app out there that can make standby mode display a clock instead?

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Android :: How To Keep Running App When Phone Goes Standby?

Aug 9, 2010

i'm programming an app that reads sensors values, and I need that it continue saving data while the phone goes standby (the screen go black after 1 minute).

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Android :: Sensor Not Being Notified When In Standby

May 28, 2009

I am listening events from accelerometer sensor and everything is going right. The problem occurs when phone gets in standby mode and I am not being notified by sensors anymore. Does Anyone know if it's possible to get sensor notifications, by implementing a listener, even if phone is in standby?

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Android : AudioRecord Creates A Stereo File Instead Of A Mono File

Apr 29, 2010

I'm developing with Android 2.1 on a Nexus One with firmware 2.1 update 1. I'm using the RehearsalAudioRecorder class from here: http://rehearsalassist.svn.sourceforge.net/viewvc/rehearsalassist/ Code...

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