OpenSL ES tutorial

[alex dashevski]

Hi,

I'm looking for a tutorial for OpenSL ES.

I'm interested in audio manipulation function(algorithm as WSOLA or pitch shifting).

Thanks,

Alex

[Glenn Kasten]

For OpenSL ES native audio API, see https://developer.android.com/ndk/guides/audio/opensl/

and the links from there to other articles.

For the newer AAudio native audio API, see https://developer.android.com/ndk/guides/audio/

For the Oboe wrapper above both OpenSL ES and AAudio, see

https://github.com/google/oboe

None of these has tutorials about writing DSP code. 

For learning DSP, I suggest you search for introductory books.

There are also discussion groups such as

https://lists.columbia.edu/pipermail/music-dsp/

but you'll often get better answers if you have first skimmed a book.

[Alex Dashevski]

Where can I find all API with examples? 

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[Glenn Kasten]

Unfortunately, the link structure is fairly deep, so you will need

to follow the initial links below to find the information you want.

For example, to find the OpenSL ES API reference,

start at the first link I shared, then click on

OpenSL ES Programming Notes, then click on

OpenSL ES 1.0.1 specification in first paragraph.

Similarly to find the sample code for OpenSL ES you need to start at first link,

then click on Getting Started, then Code samples.

See also the other APIs AAudio and Oboe.

On Sunday, July 29, 2018 at 4:25:20 AM UTC-7, alex dashevski wrote:

Where can I find all API with examples? 

On Sun, Jul 29, 2018, 14:09 Glenn Kasten <gka...@android.com> wrote:

For OpenSL ES native audio API, see https://developer.android.com/ndk/guides/audio/opensl/

and the links from there to other articles.

For the newer AAudio native audio API, see https://developer.android.com/ndk/guides/audio/

For the Oboe wrapper above both OpenSL ES and AAudio, see

https://github.com/google/oboe

None of these has tutorials about writing DSP code. 

For learning DSP, I suggest you search for introductory books.

There are also discussion groups such as

https://lists.columbia.edu/pipermail/music-dsp/

but you'll often get better answers if you have first skimmed a book.

On Saturday, July 28, 2018 at 6:55:30 AM UTC-7, alex dashevski wrote:

Hi,

I'm looking for a tutorial for OpenSL ES.

I'm interested in audio manipulation function(algorithm as WSOLA or pitch shifting).

Thanks,

Alex

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[Alex Dashevski]

Hi,

I'm looking for an example of using setPitch or setRate.

From: https://www.khronos.org/registry/OpenSL-ES/specs/OpenSL_ES_Specification_1.1.pdf

Could you help ?

Thanks,

Alex

To view this discussion on the web visit https://groups.google.com/d/msgid/android-ndk/10580a9c-d248-4860-8d8a-f0fcd3e3d98f%40googlegroups.com.

[Glenn Kasten]

This is a command-line unit test, and was written several years ago so may

have suffered bit rot and might no longer be executable as-is. But it could be a starting point:

https://android.googlesource.com/platform/frameworks/wilhelm/+/master/tests/mimeUri/slesTestSlowDownUri.cpp