In the application, songs will have been split into multiple tracks, one track per instrument.
I need to be able to play all the tracks simultaneously.
I have seen that MediaPlayer is not able to do this, indeed having 5 to 10 separate tracks would cause too much latency.
SoundPool states that it is specifically for short sounds and so is inappropriate for this.
It would appear that AudioTrack would be the answer, but that requires decoding each mp3 into pcm data before playing it.
So, here are my questions -
Even though I have not found any, do any tutorials exist demonstrating how to achieve this ?
Can anyone advise on how to play multiple audiotracks simultaneously ?
Are there any existing examples on how to decode mp3 files using the NDK ?
Related
I'm working on an android app that plays video (using video view). the video is meant to have both music (left and right) and narration, but I want to selectively be able to turn off the narration track in the MediaPlayer.
Is the way to do this correctly to encode by mp4 video file with 3 audio tracks (right left and narration) and then turn off the naration audio track with deselectTrack()?
Not clear to me from the documentation that MediaPlayer can handle more than 2 audio tracks.
If the audio tracks are limited to 2, would it make sense to run two media player simultaneously (synching them up with seekTo())when I want the narration track to play?
Thanks.
Sorry to burst your bubble, but...
1) You have a misunderstanding about what a "track" denotes. A track can have multiple channels (e.g., a stereo track has left and right channels). As I understand it, stereo is the extent of the Android AudioTrack implementation at present. I haven't yet checked if the OpenSL implementation is more extensive than the Java API.
2) Only 1 audio track can be selected at a time, so you wouldn't be able to have background and narration simultaneously in the way you were thinking.
3) Audio tracks can only be selected in the prepared state (i.e., not after playback has started). The documentation mentions this limitation is not ideal, so it will probably change in the future. If not for this problem, your goal could be accomplished with two audio tracks encoded in the stream, one with both background & narration, the other just background.
You will probably find it difficult to synchronize two MediaPlayers, but I haven't tried. Maybe this approach would be acceptable for your situation, although be forewarned the seekTo method isn't accurate. It depends on the encoding of the files.
Something I would try if I were you is to have two complete encoded videos, one with narration, the other without. Use two MediaPlayers and keep them both prepared. When you want to switch use seekTo to put the correct one at (or near) the desired location. That way you don't have to worry about synchronization. If the video is large, this method could use significantly more resources, though.
I have a lot of small .ogg sound files (average size of ~35-50KB) that I need to have played from my AWS S3, and then once played, they need to be cached on the device. There are approximately 200 sounds, and that is 1/10th of what the finished application will use.
I'm not sure the Stagefright library is my best bet, or if an entirely different approach is needed. Should I use Stagefright, or go with another option???
From your query, I feel that you could use SoundPool for your application. Please refer to this link SoundPool for more information.
A couple of examples can be found in MediaActionSound.java, SoundPoolTest.java and Soundclips.java.
I need to play multiple audio track at a time from sd card. I was trying to play with SoundPool. But it does not support larger files.
I tried with AudioTrack but it needs pure PCM code. PCM code generation bit of complex from mp3 or 3gp file, as android do not have anything build in to that.
I've look OpenSL Engine, But did not find any good example or tutorial to work with it.
How can I play multiple audio at a time in loopy style? any idea, suggestion would be great a help.
I am doing a cards game for android and I want that everytime a card is thrown, to play throwing sound. It is the same file. I will have also other sounds playing like background music , and certain clicks.
What do you recommend to use, sound pool or create MediaPlayback and play it? What would be the advantage/disdvantage to each one? should I use ogg or mp3/wave file?
Any help in this is appreciated.
Thank you
I would use the sound pool for short clips. I might be wrong but the sound pool has a smaller overhead plus it's the correct way to play short clips, it also allows you to specify how many times per second said sound clip can play which helps slower phones.
With regards to the mp3 vs ogg I use mp3. I don't believe there is any performance issues. Ogg is licence free but that doesn't really matter with regards to your app. Plus it might help if you plan on using these clips on another platform that doesn't play ogg files. No names mentioned :P
I need to be able to have multiple tracks playing at the same time, and also changing to other tracks with as little latency as possible. I don't think SoundPool will work, since it are real audiotracks and not so much samples. I'm trying to make like some sort of mixing application, where you can select certain tracks to play, and others not to play.
Any idea on how to do this, suggestions/tips ?