Android :: Decoding Encoded Audio Data On Android Without Playing It
Feb 25, 2010
Short version: What is the best way to get data encoded in an MP3 (and ideally in an AAC/Ogg/WMA) into a Java array or ByteBuffer that I can then manipulate?I'm putting together a program that has slowing down and speeding up sound files as one of its features. This works fine for WAV files,which are a header plus the exact binary data that needs to be sent to the speaker, and now I need to implement it for MP3 (ideally, this would also support AAC, Ogg, and WMA, but since those are less popular formats this is not required). Android does not expose an interface to decode the MP3 without playing it, so I need to create that
interface.
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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.here buffer is the audio data i am reading into.Same buffer I can play in MediaPlayer,,,But i could not play in audio track.
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May 22, 2009
I am using a MediaPlayer instance in order to stream audio files from an Internet location. The audio player is in a separate activity. The user can select from a list of audio files and come to this activity which plays the audio.Now the user might go back to the previous activity (with the list)and select another audio file. In this case, I want to stop any other audio that is playing and start playing the new audio which was selected.Is there any way I can know whether an audio file is playing without having to hold on to the MediaPlayer object?
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Apr 9, 2009
the opencore can not play the audio of wma. is it right? and the total time of the wma file can not be find in the trackbrowseractivity. who know why?
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Oct 13, 2009
I can capture an audio stream from the mic, but can I capture the currently playing audio stream?
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Aug 18, 2010
Can we play the audio(amr file) to the Bluetooth headset(no A2DP support) by using android 2.1/2.2 version APIs? If so can you suggest me which API I have to use to do the same?
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Sep 25, 2010
I'm trying to very quickly port over an html application with plays sound (with soundmanager2) to a native android app using WebView. From my research, I haven't seen any evidence that sound, such as mp3s, can be played via javascript or any other methods using WebView.
My goal now is to quickly port over the html app and then eventually create a truely native application without using WebViews.
If anyone has been able to successfully implement playing audio using WebViews and Javascript or if this is just not possible at this time.
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Jan 30, 2009
I want to accept incoming calls and play an audio file for the caller. Is there a possibility of playing an audio file during a phonecall, so that the caller hears a wav- file? It seems to me that nothing is possible during a phone call since release 1.0. Hope this is getting better in the next release.
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Jan 3, 2010
My self-teaching project is a small application which plays an audio news stream. To be effective, the application really needs to interrupt any currently playing media players (eg: Last FM, Imeem, music player, Spotify etc).I don't know what will be playing or what application will be playing it, but I want to ask them all to pause until I've done. Sounds rather bold, I know, but it must be possible, because when there's an incoming call, that's basically what happens.Can I send a message to all audio players asking them to pause for a moment? Could I spoof an incoming call, just for the time it takes?
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Jun 15, 2010
How do I set up an audiofile to play when a user touches an image.Where should I store the audio file and what code should I use to actually play the file?I don't want to bring up the MediaPlayer interface or anything like that.
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Jun 18, 2010
I have a javascript that plays audio in the browser, using the html5 <audio> tag. It works fine in the iPhone browser, but not in Android. (Testing using a htc desire with android 2.1.) Anyone know why?By the way, I am also trying to enlarge the audio button that shows up in the iphone (the default one is quite small), with no luck so far - would be grateful for any ideas!
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Oct 1, 2010
I think I should know this, but my mind has gone blank. I'm making an app that has a few hundred small sound files and I want it to play a certain file dependent on a String I pass to the function. Where I hit the brick wall is getting the resId of the sound file.
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Jul 1, 2009
My application is making call from application. Now I want to play some audio on speaker when the caller will receive call. So can some one tell me will i have to play audio in new thread or I will have to do some change? Can someone give me any code snippet?
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Jul 5, 2010
I would like to find an media player that plays videos but when I minimize or multitask to another app I want the videos audio to keep playing like pandora does. The reason for this is bcuz I rip videos off of youtube to mainly listen to the music.
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Nov 27, 2009
I am trying to make a very simple radio player for Android and I cannot get the audio streaming to work. In my latest attempt it plays for about 1 second and stops for some streams and it doesnt work at all for some other streams. Logcat doesn't give much useful information to me. I am testing on HTC Hero (Android 1.5).
If I hook the completion and buffer events I see the audio gets a complete event but it keeps buffering. Is there anything wrong with the code below? Should I be able to stream the the audio streams below? Is there a complete example somewhere of a working radio streaming?................
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Aug 7, 2009
Is it possible to play audio over an active phone call, so the other end can hear it?
For example: A and B are talking on the phone. A presses a button that pulls audio from a resource and plays it over the phone call to B.
If so, what libraries should I look into? If not, is this something that could become accessible on rooted phones? (Of course, only other rooted phones would be able to use the application then...)
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Apr 20, 2010
I want to play an audio file on a voice call as following:
The application initiates a call from device X to device Y
When Y replies application on device X should inject an audio file in the stream of the call so device Y hears this audio file.
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Aug 26, 2010
My music application constantly plays music in the background, however I'd like to be able to detect when another application starts playing audio (such as the YouTube app) so I can pause/mute/stop the audio in my application. This will allow a user to continue browsing the web whilst listening to music, but then if they wish to watch a video at any point, they can do so without audio conflict.
One solution might be to listen for a broadcast which states when an application begins using the AudioManager. Does such an Intent Action exist? Edit: As in the answer provided below, there appears to be a method of detecting the loss of audio focus in 2.2 with AudioManager.OnAudioFocusChangeListener.
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Nov 18, 2009
I have a activity which is called from another activity as an intent... This activity loads and starts playing a audio file. All is good - that much works. The activity also has a "stop" button and that stops the audio from playing - that is also fine.
But how do I stop the file from playing if the user uses the back button to leave the activity without clicking on the "Stop" button?
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Nov 16, 2010
I have a requirement where I need to play an audio file in receiver mode(earpiece).I am not sure whether higher versions of Android SDK supports this receiver mode.I went through some links which said about 1.5/1.6 having changes in these Audio APIs and hence not sure.
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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 14, 2009
I'm using the SoundPool to play a series of small audio clips and am having issues with the audio when it starts. I have the audio attached to a button press. When I press the button mulitple times the tick persists. I was wondering if this was the audio file itself or is there something I need to do differently with the SoundPool other than play simply play the clip. These are .ogg files I created using Audacity. When I play them in my dekstop media player, they sound fine.
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Nov 4, 2009
Did anyone try playing audio/video through http/rtsp. I am having a problem with either of the approach.... I am getting an error Command PLAYER_INIT completed with PVMFError I some cases I got Command PLAYER_INIT completed with PVMFErrorContentInvalidForProgressiveDownoload.
Can some one explain what is the problem. The code snippet I am using is given below. Code...
The code works fine when I say mVideoView.setVideoPath("/sdcard/vv.3gp"); but not able to play if I give a rtsp/http urls. In case of http it says PVMFErrorContentInvalid for progressive download.
Can some body tell me what is the problem. Can you please post the code if someone has been successful in playing audio/video through http/rtsp.
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Mar 15, 2010
I have a button that plays an audio file on its click listener. If the button is clicked again and again while the audio file is being played then the app crashes. What's the solution?
Here is some code for reference...
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Mar 25, 2010
I am trying to play the bigger size audio wav file(which is >20 mb) using the following code(AudioTrack) on my Android 1.6 HTC device which basically has less memory. But i found device crash as soon as it executes reading, writing and play. But the same code works fine and plays the lesser size audio wav files(10kb, 20 kb files etc) very well.
P.S: I should play PCM(.wav) buffer sound, the reason behind why i use AudioTrack here. Though my device has lesser memory, how would i read bigger audio files bytes by bytes and play the sound to avoid crashing due to memory constraints. Code...
Could someone guide me please to play the AudioTrack code for bigger size wav files?
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Dec 9, 2009
I am streaming an MP3 audio and instead making this MP3 audio to play, I want it to be converted to PCM format and pass this PCM audio to AudioTrack(as it takes PCM data as input.) instead of passing my MP3 stream to MediaPlayer. Can anyone please help me to convert the MP3 to PCM stream?
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Aug 21, 2010
Invoked device native player to play audio file, it opens android native player on top of the application but when selecting to back out or return to the application, device automatically stops playing the current media.
Sample code:
Intent intent = new Intent();
intent.setAction(android.content.Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(file),"audio/*");
startActivity(intent);
How can I implement so that Device should continue to play audio in the background when selecting to back out or return to the application
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Aug 22, 2010
Has anyone figured out how to play audio from the HTC EVO (mp3, Pandora, etc) through the USB or HDMI ports?I've looked seemingly everywhere and have not found anyone who has done it.I want to be able to amply drive my Grado SR80i headphones.I believe I could do it with a portable amp like HeadRoom's Total AirHead through the headphone jack, but if I'm not mistaken, the headphone jack is sonically inferior to a line out jack. The problem is, the EVO doesn't have a line out jack.my inquiry regarding harnessing audio from either the USB or HDMI ports.Let's assume the answer to my question above is NO.I'm relatively satisfied with the sound quality I get from the EVO using Sennheiser PX 100 headphones and the tiny FiiO amp. The problem is, I blew the Sennheisers. That's why I bought the Grados.Undoubtedly, the Grados will handle more power. Unfortunately, my tiny FiiO amp won't power the Grados. So my second question then is will a better amp sufficiently power the Grados through the headphone jack?
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Nov 23, 2010
Ok so I see a lot of people saying they are having problems with video playback when importing from their SD Card but Im having the opposite problem.
I just switched over from the Metro PCS Samsung Code which is a Windows 6 phone to EVO and I put my SD Card in my EVO. All my music files play and the mp4 video files play but the audio from the mp4 video files dont. Does anyone have advice on how to fix this?
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Apr 24, 2010
Every time I go on youtube the video plays but the audio doesn't.
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