Android :: How Can I Get Amplitude Volume / When Recording With AudioRecord?
Apr 6, 2010How can I get the amplitude/volume when recording with AudioRecord?
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Media :: System Sleep While AudioRecord Is Recording?
Sep 8, 2009I 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:.........................
Error Recording Audio Using Native AudioRecord Interface
May 25, 2009Record 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.
Android :: Audio Recording With High Volume
Sep 7, 2009I 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?
Android :: Using AudioRecord API
May 15, 2009I'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?
View 6 Replies View RelatedAndroid :: How To Use AudioRecord And AudioTrack?
Apr 30, 2009I 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.
View 7 Replies View RelatedAndroid :: Synchronizing AudioTrack And AudioRecord
Jan 21, 2010My 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?
View 2 Replies View RelatedAndroid :: How To Add Own Audio Codec To AudioRecord?
Mar 10, 2010I 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.
View 2 Replies View RelatedAndroid :: AudioRecord Is Not Working On Emulator
Nov 11, 2010I 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.
View 2 Replies View RelatedAndroid :: AudioRecord On Emulator With Frequency 8 KHz
Mar 25, 2010I'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.
View 2 Replies View RelatedAndroid :: Relation Between MediaRecorder And AudioRecord?
Apr 1, 2010the location where the audioflinger, surfaceflinger and cameraservice talk to MediaRecorder's APIs? Is there any relation between MediaRecorder and AudioRecord?
View 6 Replies View RelatedAndroid :: AudioRecord On Samsung Moment
Sep 25, 2010We 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?
Motorola :: Android AudioRecord Fails To Initialize
Nov 12, 2010I'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...
View 1 Replies View RelatedAndroid :: AudioRecord Producing No Sound Data
Dec 6, 2009Here 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,......
Android :: AudioRecord Class To Analize Raw Pcm Bytes As It Comes In The Mic
May 27, 2010I 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
Android :: Improper Audio Format While Using AudioRecord API / What To Do?
Oct 12, 2010I 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...
View 3 Replies View RelatedAndroid :: AudioRecord Class - Callback Is Never Called
Feb 15, 2010My 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:.........................
Android :: NexusOne AudioRecord Randomly Goes To Standby
May 9, 2010On 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 :: AudioRecord - OnPeriodicNotification And OnMarkerReached Are Not Called
May 13, 2010I'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?
Android :: Catching AudioRecord Exception When Not Processing Fast Enough
Jun 19, 2009In 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?
View 2 Replies View RelatedAndroid :: AudioRecord Doesn't Work For Motorola Milestone
May 4, 2010I'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]
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Android :: AudioRecord Works With Short But Static With Byte
Jan 8, 2010Any 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:.......................
Android :: AudioRecord Can't Get Any Notification When Record/marker Position Updated
Apr 23, 2009hello 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:.............................
Android :: How To Play Audio Files At Phone Volume Level / Not Speaker Volume
Nov 22, 2010I'm writing an Android application that plays back voice mails using Media Player, which are just WAV files that have been sent to the device. When I play the file, it's played on the device's speaker, or else it plays through headphones if they're plugged in. What I want to do is play the file so that it sounds to the user as if it's at the same volume level as a normal phone call. Is there a way to route playback so that the file is played through the phone's ear piece instead of out of the speaker?
View 2 Replies View RelatedAndroid :: How To Change From Ringer Volume To Media Volume?
Oct 12, 2010On one page of my app there are sounds. Is there a line of code to allow the volume up/down buttons to switch to media volume control for that page of the app only? Or do I need to set it for the entire app, and how do I do that?
View 4 Replies View RelatedMotorola Droid :: Disable Volume Control Button As It Works On Ringer Volume?
Jan 6, 2010Is there any way to disable the volume control button as it works on the ringer volume? I use locale, but I bump those buttons often enough and turn the ringer off completely.
View 27 Replies View RelatedGeneral :: Sprint Vital ZTE N9810 - Separate Ringtone Volume From Notification Volume?
May 21, 2014Recently purchased the Virgin Mobile Supreme (Sprint Vital, ZTE N9810). The one thing that is bothering me is that there is only one volume setting for the combined ringtone and notifications. I would like to set these volumes separately.
I tried one volume control tool, but even though it had 'separate' controls changing ringtone changed notification and vice versa.
Samsung Vibrant :: Set Volume Rocker To Adjust Notification / Ringer Volume
Jul 17, 2010I noticed that when turning down the volume of the ringer with the volume rocker it doesn't automatically turn down the notification volume as well. Is there a way to set the volume rocker to adjust both notification and ringer volume to the same level? You can test this by going under Settings/Sound and Display/Ringer Volume...and try adjusting the volume with the rocker and it only adjust the Ringer Volume.
View 2 Replies View RelatedJelly Bean :: Alarm Clock Volume Resets Itself To Low Volume?
Apr 16, 2014I have Android 4.2 on my mobile phone which I have bought recently.
Everything is running fine on my phone so far but with the exception of my clock's alarm volume.
For example:I set the alarm volume to max, I go and set my clock alarm to ring and when the alarm rings the volume is set to very low.When I check back to verify the volume, the volume is set to very low. I am very sure that I have set it to max though.
I have tried to reset my phone to factory settings, it didn't work..
Android :: Android AudioRecord And AudioTrack Codec Options?
Feb 3, 2010I 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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