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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Aug 7, 2010
Dear PV engineer: I have try several days for this. We want to add video conference function in PV opencore, so we need to create video capture node in native mode, I try the following code to capture video, My code is like this:
CODE:......................
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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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Apr 6, 2010
How can I get the amplitude/volume when recording with AudioRecord?
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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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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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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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Nov 14, 2010
I'm working on an android app and I'm stuck. Here's the scenario that I have: The user picks a contact to call The user presses the dialer button to call that contact Android's native dial screen pops up i.e. Dialing Contact screen Here's what I want to do: after pressing the dialer button, is there any way for my app to control what pops up after pressing the dialer button?
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Jul 31, 2010
I've seen a lot of remarks about good call recorder apps for the EVO 4G. None of them are really that good or reliable.
To take advantage of native call recording on the EVO 4G, all you need to do is set the phone call to speaker after connected and then start the Voice Recorder app that comes with the phone. It records both sides of the conversation very clearly and you can adjust the speaker volume to about 75% for optimum audio capturing.
In the state of Texas, it is legal to record any conversation without informing the other party that you are doing so. Be sure to check with your state before recording any phone calls covertly.
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Sep 23, 2010
Does HTC Incredible...
1) Comes with native call recording functionality...?
2) Support call recording with 3rd party applications...? (not using the speakerphone)
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Sep 23, 2010
Does HTC Desire...
1) Comes with native call recording functionality?
2) Support call recording with 3rd party applications? (not using the speakerphone)
Reference: Android Phone with Call Recording Function
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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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May 14, 2010
Voice recorder and all other 3rd party apps record audio like absolute garbage. I am very disappointed. Such an awesome camera and camcorder but it sounds like I am speaking through a damn kazoo. I am dying to know if it's firmware or just cheap hardware, not to sound bitter but the iphone has a SUPER high quality mic being that Incredible just came out I was very surprised at the low quality of the audio recording
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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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Sep 20, 2010
I have no problems with the video recording on my Evo it looks amazing but I go to a ton of concerts and such and I love recording them with my Evo but it just sounds Awful, I was wondering if there was any setting to make or change to make the aduio recording sound much better?
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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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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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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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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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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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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?
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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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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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Jul 6, 2009
AudioRecord can record audio data in pcm format in realtime, but there is no audio-encoder who can encode pcm data to amr format. may be third-party java code can do this, but the performance may be very low.MediaRecorder just record audio data to disk. not realtime.It seems that this is a real miss-impossible?
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Jan 16, 2010
I'm writing an App that needs to continuously record audio in memory and email the last 30 seconds of audio when required. Much of the mediarecorder API is designed to store linear audio in files. Could anybody point me towards a way to continuously record audio in memory, using a circular buffer using the SDK?
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Jul 19, 2010
I need to record audio and video files in 3gp/mp4 format at the same file and same time.
When i run my application file is created with videofile.3gp but video does not record in sd card on the emulator.please let me clear one thing does video records on the emulator? if i run this code on android supported device do these error clear.
Please help me. I am new to this topic.please find the code and errors below.
package com.video;
* @copy Rights
* audio.java
* sample code for Eminosoft Developerworks Article
* Android development Team
* www.eminosoft.cm
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.provider.Settings;
import android.util.Log;
import android.view.View;
import android.widget.Button;
public class video extends Activity {
public MediaRecorder mrec = null;
private Button startRecording = null;
private Button stopRecording = null;
private static final String TAG = "SoundRecordingDemo";
File audiofile;
File video;
private MediaPlayer mMediaPlayer;}
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Oct 1, 2013
i've installed super jelly bean its awsome but video recording volume is very very low.
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Sep 3, 2010
The audio/video works perfectly if I watch the recording on my phone, but when I email the video to my gmail account and save it to my computer, it opens in Media Player and there's no sound. Does anyone know how to fix this?
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Jun 16, 2009
I have the following native source code that is supposed to display video. It plays 3gp file ok and I can hear the audio, but the video is not shown.
CODE:..............
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Jul 16, 2010
When the stock Android media player is playing a song, if you tap the album art box, you will discover that the Droid X has a visualizer for your viewing pleasure.
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