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I want to combine two audio files. (A audio file + B audio file = AB audio file)
After searching around, I think the following steps will work
Using an AudioTrack.
Decode PCM from audio files.
Combine PCM.
Are the above steps right, if not, what would be another way to achieve it?
Is there an example and Library source available to look at?
Check Audio Development for Android for information on the subject. Its going to take some research, I do not know much about Android or I would help further.
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Hi Can I add audio to Video in android(Java).
List item Both are in my SD card and merge and give into mp4 format.
Yes, you can. But it will not be so easy,
You need to learn about these api's
MediaExtractor to extract data/track from file.
MediaCodec if you want to encode/decode
MediaMuxer to mux it into mp4 file
You can use all three of them together if you need to or individually.
You can find some example code here.
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I want to compare two voices(Names) in my App. Can I use Speech to Text api for it? The idea is to first convert them to text and then compare. Has anybody have tried it? If yes how accurate is it?
Comparing two audio files for similarity is an imperfect science best approached with hammers like Fast Fourier Transforms, audio "fingerprinting", and heuristic analysis. You will need to read up on signal analysis to get started. I recommend starting with this thread to get some ideas.
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I have read regarding MP3 and its patent. I'm confuse as to which part of using MP3 I can be sued for.
Like if I create and Android App which record WAV and I want to convert it to MP3, can I get myself to a lot of trouble?
How about those Apps in Play Store which offers converting to MP3, are they paying too?
I don't know if this is the forum for a question like this... The short answer is if you're making money you have to pay. I don't think they are going to get bent out of shape if you aren't intaking any revenue, but tread carefully. You can read about MP3 royalties rates here.
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I'm making a music player for android and I would like to get the average BPM (maybe also frequencies or tones) of a song BEFORE playing it, so I can show the user some info about the song, I know I probably have to open a stream and apply some maths to it to get the data I need, but I don't know how to act, can anyone help me?
I finally found the solution!
I'm using the Minim java audio library, which can performs offline analysis on the audio buffer :)
http://code.compartmental.net/tools/minim/manual-minim/
You can use the FFT
FFT library in android Sdk
This example may be helpful:
Android audio FFT to retrieve specific frequency magnitude using audiorecord
another one:
Get sound frequency with Android FFT
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I want to do a documentation for an Android application. There's no problem with the java files but what about the xml-s? I think they are needed to understand some of the functionalities the application provides.
What is the proper way to visualize the xml files in the documentation or is it necessary to do it?
Only the layout files need some explanation . The rest are pretty much self explanatory. You can probably use XML comments to explain a few things. You don't really need to document an XML file as its not exactly an API.