Android :: Continuous Raw Audio Playback Using AudioTrack
Dec 29, 2009
I am trying to play raw audio samples ( 16 bit, stereo, @ 32000KHz) using AudioTrack, in "MODE_STREAM" mode. I could play the first video buffer successfully but, After having received "onMarkerReached" for that raw audio buffer, I wonder how to push more audio data in AudioTrack ? without closing/stopping it. Writing more data to AudioTrack in "onMarkerReached" callback does not help. I am using the same thread to construct the AudioTrack and pump in audio - buffers and receive callbacks.
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Apr 13, 2010
I'm in the process of wring a music player that can play SID tracks (music from the Commodore 64), and everything is progressing nicely, except that I sometimes get audio stuttering.The stuttering only happens when the player is in the background, and another application has focus. It's most noticeable when a cpu heavy app(like Google Earth) is running in the foreground.I have tried adjusting the priority of my thread and increasing the AudioTrack buffer size, but nothing has solved the stuttering problem.I believe the problem is that generating the audio takes quite a lot of cycles (I'm at 15-30% cpu load), and that my audio thread is being starved and cant keep up with AudioTrack's constant need for data.I'm must be doing something wrong, I can't imagine that gui threads should be able to starve a high priority audio thread.I hope someone have some ideas on how to get my player stutter free, as I'm at a loss :)
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Dec 15, 2009
I am trying to play a 0.1s tone using audio track. I have done this succesfully in stream mode by calling play() then writing the array of short containing the data. However when I use STATIC mode and also in stream mode if I write the data before i call play() only about 0.06s of the audio is played. I have tried changing the buffer size but this has not effect.My understanding is that I have to write the data before I call play for static mode to work. Does anyone know what could be going wrong here?
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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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Oct 26, 2009
I first have to say that I'm biased, 'cus I like to write music apps (like music generation apps). However, this affects games as well. It's somewhat disappointing how OpenGL has made it into the NDK now but there isn't any NDK methods to get to sound to have faster access. Over the weekend I did some more testing and if you make a "drum" app, for example, and play the sound using either SoundPool or AudioTrack, you will get about a 100ms delay buffer, which is clearly audible (gap).
I made a test app where when you touch the screen, upon the DOWN event, it would play a short sound (like a drum sound). It clearly was not real time responsive or even close - you could hear the delay. I'd be interested to know if anyone who has made a game has any trouble with sounds? It seems like they aren't going to really trigger real time enough if you use SoundPool, for example. Am I completely wrong? Seems like your game is going to perform an action, play a sound, but the sound will have latency which I would think would throw off the game a bit..................
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Dec 25, 2009
I need to stop the AudioTrack, regardless what's in the buffer, immediately when executing the stop/release. The AudioTrack plays in the STREAM mode. It appears that the AudioTrack finishes playing what's in the buffer and than stops. It seems that it's such a fundamental flaw since there are so many audio applications out there.
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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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Mar 14, 2010
I'm new to development on Android and thought maybe you could shed some light on my problem. I'm trying to code up a little object to take care of playing a list of songs at a constantly varying playback rate. I just spent a god chunk of time getting it going with SoundPool only to find out about the undocumented 1 mb file limit. Do you guys have any ideas? Should I be using AudioTrack? I was going to try that next. Any tips or code samples for doing this kind of thing? It's such a shame that neither JetPlayer nor MediaPlayer support rate changes.
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Aug 11, 2010
What codec settings will produce valid videos for playback on Android (videoView) and iOS UIWebView)?
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Jun 28, 2010
Started this morning out of the clear blue. During audio playback (music, internet streaming, etc.) faint beeping sound only in the right headphone. Tried multiple headphones and it is there. EXTREMELY ANNOYING..
Looks like it pops up when the unit is accessing data. WFT?
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Nov 5, 2010
Just got a Droid Incredible and love the phone so far. I have a problem however playing back video that I recorded. The video comes out fine but there is no audio track. Same happens when I play back on my PC. I have read some forum posts that were similar but none of the solutions offered have worked for me. I have done the following: Played back on phone, WMP, VLC and Quicktime.
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Jun 17, 2010
Is horrible audio playback just part of the 2.2 leak or is it just me? Kangerade, BB, and the stock 2.2 all have very tinny sounding audio quality regardless of the player used. Anyone else noticed this? Better yet, anyone have a fix?
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Apr 3, 2014
On Android 4.3, and playing any type of media such as MP3 or movies, and a text message, e-mail, or any other type of messages is received, unless the phone is actually muted the audio playback is interrupted with a notification. Has that been addressed in KitKat?
I'd like the option to dis-able audio notifications (blinking LED or vibrate is preferred) so the audio experience isn't interrupted.
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Jun 24, 2010
I have had my Droid since release day, and I am still carrying an iPod Touch as well. My problem is that I keep getting problems with audio playback using headphones with an inline remote. For me, it is absolutely essential to be able to pause/play audio when out and about. People talk to me, I get up to the checkout stand, etc. And, the process of pulling the phone out, swiping it on, getting to the app and pressing pause just won't work. Headphones with inline remotes are the only thing that really work for me.
The problem is that the Droid can't seem to play nicely with these remotes. The volume controls never work at all, and sometimes the pause/play works, sometimes it acts like a skip to the next track. Sometimes it just freaks out and starts cycling through my various audio apps (Listen, Pandora, the stock music app) and then eventually freezes. Has anyone found a workable way to do what I want? I need to be able to pause and play audio while the phone is entirely stashed away.
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Aug 27, 2010
Been struggling with this since receiving my X. Seems like no matter what player I use the playback is jerky. It's very subtle, almost as if the video is dropping a frame or so every second. I've tried the stock player, Astro, Rockplayer, mPlayer, Zimly, Act, and the list goes on and the problem still persists.
I've encoded (using handbrake) with all of the settings suggested on the boards and have tweaked things on my own trying to find the proper setting, but still no luck. The strange and frustrating thing is that the exact same files play just fine on my 1st gen iPod touch (clearly an inferior piece of hardware) and on my wife's incredible. These encodes are of standard def DVDs at average settings (a full movie is about 1.3gb, all h.264 mp4 files.
I was able to improve playback by rebooting the X and then playing the video, but this doesn't seem like an acceptable solution every time I want to watch something. I tend to encode and watch a lot of stuff on my commute to/from work, and I'd really like to replace my touch with the X, but the media capabilities are falling way short. Considering switching to the Inc as I know it's able to play my media properly, but I'd prefer to keep the X for the larger screen size (though the Inc does seem to feel better when using one-handed). I'm on the fence right now, but if the X can't function as expected then it might be going back. Unfortunately I only have until the 1st to return it so I don't think I can hold out and see if 2.2 fixes this issue.
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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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Apr 23, 2009
I'm currently initiating the AudioTrack() for MODE_STREAM. I load some bytes using the write() and I see that it is working but once hit the play() call nothing happens. what is the matter? should I do something else that is not obvious? Any tips Google friends? My settings: streamType - STREAM_MUSIC sampleRateInHz - 44100 channel Config - CHANNEL _CONFIGURATION_STEREO audioFormat - ENCODING_PCM_16BIT bufferSizeInBytes - 256K the total size (in bytes) of the buffer where audio data is read from for playback. mode - MODE_STREAM.
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Feb 8, 2010
Has anyone found a video player that automatically plays the next video when the first video ends like episodic videos?
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Feb 15, 2010
I want to play music from online mp3 link.I am reading the music data into a stream and trying to play it using audio track. But itz giving only noise.No music i could listen.Same buffer I can play in Media Player,But i could not play in audio track.
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Dec 15, 2009
I am getting this clicking sound when playing static pcm data. Anybody out there is having the same problem? This is not the data issue.
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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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Jun 27, 2009
If I create and release multiple AudioTrack objects, the GREF count continually increases which eventually causes an application crash. Even with a forced garbage collection, I end up with the same high GREF count at the end of the loop.In my application, I continuously create AudioTracks from variable lenght buffers.I guess I can try and use a fixed size pool of AudioTracks each with a buffer large enough to fit my longest sound, and try and reuse them.Is there a better/correct way to completely clear resources used by an AudioTrack?
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Aug 10, 2009
There is a AudioTrack Class in SDK 1.5 which can play PCM buffer directly.But it is not exist in SDK 1.1. I want to play PCM buffer in SDK1.1,but i don't know how.
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Oct 2, 2009
I am trying to determine if I should go the ndk way to work on a music synth app, but first wanted to do a sanity check in the java layer by testing how many sine tones i could play concurrently, and so I tried this. And it's pretty low: I can only play about 4 or 5 tones before the obtainBuffer timeouts start increasing in number. Also, changing the media volume while the tones are playing disrupts the output.
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Jan 21, 2010
I am trying to resolve the clicking problem while using the AudioTrack. It takes place only when playing the first part of the wave (pcm) buffer when the offset to the write is 0 (zero). track.write(buffer, offset, minBufferSize); It tells me that there is something wrong with the pcm data. Could it be because the wave data, I generate using Audacity, has some header as opposed to the pure pcm which does not? I was looking for the converter tools to generate pure pcm but found none. Applications I found generate only wave data so I am not able to test this assumption. At this point I am sure that filling the buffer is correct. Any ideas?
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Jan 25, 2010
I'm currently writing an app that uses a Service. A thread in the service generates an infinite stream of audio, and writes it to the AudioTrack. I want the audio to keep playing indefinitely until the user stops it. Based on my understanding of the PowerManager class, it looks like I should need a PARTIAL_WAKE_LOCK to keep the CPU awake so the audio can continue playing.
However, I left the audio playing on my phone with no wake lock, running on battery, in airplane mode, with all five items on the power control widget disabled, and the audio just kept right on playing for at least 15 minutes. Afterwards, I looked at the battery history, and it showed "Running (100%)", even though the Partial wake usage was negligible. Is there something special about AudioTrack which prevents the CPU from entering its deep sleep state? Should it be necessary for my service to grab a PARTIAL_WAKE_LOCK and its associated permission?
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Dec 16, 2009
It doesn't seems as if the the stop and release immediately terminates the audio played by the MODE_STREAM track. It looks like it finishes playing the rest of the buffer and then stops.
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Jul 17, 2010
I own a samsung moment which was rooted about a month+ ago. I started receiving an error message randomly today from HelixLauncher: The application HelixLauncher (process com.helixproject.launcher) has stopped unexpectedly. Please try again. It prompts me to force close then I receive the same error message yet again. I cannot access anything on my phone as this error message renders anything on the phone almost completely inaccessible. I don't understand why I've randomly gotten stuck with this error message. I'm guessing my only option is a hard reset/safemode reboot and eventually re-root; this application seems to fuel a large part of the current 'root' I am running.
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Jun 9, 2010
I'm looking for a way to implement a minimum value in my SeekBar and also have the option to increment decimal numbers. For example, currently my SeekBar's minimum is set to 0, but I need it to start at the value 0.2. Also, I would like to have the functionality to be able to have the user select a number from 0.2 to 10.0 at a .1 precision so they can choose the numbers 5.6 or 7.1.
Here are the style attributes for my SeekBar:
CODE:..............
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Dec 8, 2009
I am getting the 'AudioTrack::start called from thread' when starting an AudioTrack. I am using it in a thread. I asume I shouldn't but why? I see it as a major limitation.
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