Job offer for freelance library developers

Djembefola

Djembefola

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i need the help of experienced freelance library developers for accomplishing the following tasks:

1. Finished! Thank you, warwound Decoding mp3 to wav

2. Finished! Thank you, warwound Encoding wav file and/or in-memory wav buffer to mp3

3. Time-Shift algorithm for wav (= changing tempo and keeping pitch)

4. Finished! (Thank you, Informatix) Microphone level

5. Finished! (Thank you, thedesolatesoul) Mixing/combining two or more wav files/buffers

6. Finished! (Thank you, Informatix) Asynchronously unzipping files from a zip or tar archive (without blocking the application)
see this thread:[LIB] Archiver

7. Library for Google Play expansion files
see this post

8. Library for Google Play subscriptions (In-App-Billing)


I don't need exclusive rights on the source code. I'm just interested in getting a reliable solution for my application.
That means: you may resell the source code to other clients or provide the members of this forum with a free library/free source code.
Payment via Paypal.
 
Last edited:
Informatix

Informatix

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Djembefola said:
i need the help of experienced freelance library developers for accomplishing the following tasks:

1. Decoding mp3 to wav

2. Encoding wav file and/or in-memory wav buffer to mp3

3. Time-Shift algorithm for wav file/in-memory wav buffer(= changing tempo and keeping pitch)

4. Measuring/displaying microphone level

5. Mixing/combining 44100hz 16bit wav files/in-memory wav buffers

6. Asynchronously unzipping files from a zip or tar archive (without blocking the application)

7. Library for Google Play expansion files

8. Library for Google Play subscriptions (In-App-Billing)


I don't need exclusive rights on the source code. I'm just interested in getting a reliable solution for my application. That means: you may resell the source code to other clients or provide the members of this forum with a free library/free source code. Payment via Paypal.
Click to expand...

About 6: I never saw the tar format on the Android platform and I wonder if there's really a need for it.
A zip/unzip function that works asynchronously is very easy to do (there's a class in the Android API: ZipFile). I can do it if you wish.
Note: there's already a zip/unzip library for B4A but it is not based on the API class and doesn't seem to work well.
 
Djembefola

Djembefola

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Hi Informatix,

thank you for your reply.

Informatix said:
About 6: I never saw the tar format on the Android platform and I wonder if there's really a need for it.
Click to expand...
Tar archives could be interesting for b4a users because of Erel's gzip/zlib functions : gzip-zlib-compressions

Note: there's already a zip/unzip library for B4A but it is not based on the API class and doesn't seem to work well.
Click to expand...

I know the existing zip/unzip library and i know its limitations (blocking, stripping characters in filenames).

A zip/unzip function that works asynchronously is very easy to do (there's a class in the Android API: ZipFile). I can do it if you wish.
Click to expand...

Oh yes i wish. Please send me a pm (with the price you have in mind)
 
Informatix

Informatix

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The Erel's GZip comes from the same class as Zip. The TAR format is not very difficult to implement (fortunately because I found almost nothing for Android). I think it's feasible before the end of the week. I'll post my conditions tomorrow (I think it's time to change my Ferrari :)).
 
Djembefola

Djembefola

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Ok, list item No. 6 (extracting files asynchronously from an archive): done.

No. 1, 2, 3, 4, 5, 7 and 8 still remain.

:sign0163:
 
Djembefola

Djembefola

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Come on, freelancers! Are you too busy or are you all on vacation?

No. 5 should be pretty easy!

(for someone who knows how to do :)). i suppose it is even possible to write
such a function in pure b4a. Unfortunately my math skills fall far short.
 
thedesolatesoul

thedesolatesoul

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Mixing two wavefiles.
Are you saying just read them as a byte stream, read the values and mix them like:
outval = amp1 * wavevalue1 + amp2 * wavevalue2

Thats incredibly simple! okay maybe i oversimplified

Who is doing the decode/encode to wave, that might give a better 'wav' file reader. Unless someone is trying to import lamemp3 encoder.
 
Djembefola

Djembefola

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thedesolatesoul said:
outval = amp1 * wavevalue1 + amp2 * wavevalue2
Thats incredibly simple! okay maybe i oversimplified
Click to expand...

Unfortunately it's not incredibly simple. My knowledge about audio dsp programming tends towards zero but i know for sure, that the bytes need to be converted and a floating point calculation is required.
 
Djembefola

Djembefola

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For No. 4 (Get/Set Microphone Level)

With a little help by Informatix i have already found a simple solution for getting the microphone level.

Setting the microphone level seems to be more difficult. The one and only hint i found was this one on stackoverflow.com:

Set your audio source as "MIC" using MediaRecorder.AudioSource class and adjust volume by calling onVolumeSetRequest method.
Click to expand...
 
warwound

warwound

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Is there anything in musicg library that would be useful to you?

It might be able to open PCM audio files and return the contents as two byte arrays or streams - i PMd you earlier saying we need something like this for the LAME encoder.

So i'll take a look at musicg over the next couple of days and see what it has to offer.

Martin.
 
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