starting android development

[Chuck Crisler-2]

I am trying to learn Java and Android development at the same time. Fortunately, I know GStreamer fairly well. I have the Android Studio, the SDK and the NDK installed on my Linux system and have downloaded the GStreamer 1.4.5 ARM v7 binaries. I have also downloaded the GStreamer SDK and have been looking at ~slomo/gst-sdk-tutorials. I am confused and can't seem to 'put it all together'. I have read and built and executed (on my Android phone) some of the pure Android samples, including JNI samples. I feel that I could convert a GStreamer Android SDK based tutorial to the Android Studio structure.

Here are the questions that I immediately don't understand.

1. Do I need both the 1.4.5 binaries and the GStreamer SDK?

2. Do I need to build anything to get started working with the GStreamer tutorials?

3. Tutorial #1 imports package org.freedesktop.gstreamer.GStreamer, which I don't think that I have. How should I build it, or where is it?

4. Which tutorials are more current, ~slomo or the GStreamer SDK?

5. Is it possible to run something like the command line gst-launch application on Android to test pipelines and installations?

All guidance is greatly appreciated.

Thank you,

Chuck Crisler

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[Sebastian Dröge-3]

On Do, 2015-03-19 at 22:30 -0400, Chuck Crisler wrote:

> I am trying to learn Java and Android development at the same time.
> Fortunately, I know GStreamer fairly well. I have the Android Studio, the
> SDK and the NDK installed on my Linux system and have downloaded the
> GStreamer 1.4.5 ARM v7 binaries. I have also downloaded the GStreamer SDK
> and have been looking at ~slomo/gst-sdk-tutorials. I am confused and can't
> seem to 'put it all together'. I have read and built and executed (on my
> Android phone) some of the pure Android samples, including JNI samples. I
> feel that I could convert a GStreamer Android SDK based tutorial to the
> Android Studio structure.
>
> Here are the questions that I immediately don't understand.
> 1. Do I need both the 1.4.5 binaries and the GStreamer SDK?

The GStreamer 1.4.5 binaries contain everything that the "GStreamer SDK"
contains, just 3 years newer.

> 2. Do I need to build anything to get started working with the GStreamer
> tutorials?

You just need to extract the binaries to some please and then set
GSTREAMER_ROOT_ANDROID in the environment to that place. Then you can
just build them like any other Android project.

> 3. Tutorial #1 imports package org.freedesktop.gstreamer.GStreamer, which I
> don't think that I have. How should I build it, or where is it?

That's autogenerated by ndk-build.

> 4. Which tutorials are more current, ~slomo or the GStreamer SDK?

See above :)

> 5. Is it possible to run something like the command line gst-launch
> application on Android to test pipelines and installations?

Yes but command line applications don't have access to the hardware
codecs and other things, and you need a rooted device.

See
https://coaxion.net/blog/2014/10/gstreamer-remote-controlled-testing-application-for-android-ios-and-more/
for some gst-launch style application for Android/iOS.

Also see
https://github.com/sdroege/gst-player
for some (hopefully) cleaner code (than the tutorials) for how to do
GStreamer Android development by properly splitting the backend (C) and
the frontend (Java).

--
Sebastian Dröge, Centricular Ltd · http://www.centricular.com

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[Sérgio Agostinho]

Hi Chuck, 

This might also be useful. I remember I struggled for a while to properly build Gstreamer with Android Studio. Place your Android.mk and Application.mk inside src/main/jni

Add these snippets to your local.properties file

android{
    //otherstuff
    sourceSets.main {
        jniLibs.srcDir 'src/main/libs'
        jni.srcDirs = [];
    }
    tasks.withType(JavaCompile) {
        compileTask -> compileTask.dependsOn ndkBuild
    }
    task('ndkBuild', type: Exec) {
        // normal building tool
        commandLine 'ndk-build', 'clean'
        commandLine 'ndk-build', 'APP_PLATFORM=<replace with target version e.g. android-19>', '-C', file('src/main').absolutePath
    }
}

This ensures your ndk code will always be compiled before your java code, and that the Gstreamer.java will be already in your src folder. 

Cheers

2015-03-20 9:41 GMT+01:00 Sebastian Dröge <[hidden email]>:

On Do, 2015-03-19 at 22:30 -0400, Chuck Crisler wrote:
> I am trying to learn Java and Android development at the same time.
> Fortunately, I know GStreamer fairly well. I have the Android Studio, the
> SDK and the NDK installed on my Linux system and have downloaded the
> GStreamer 1.4.5 ARM v7 binaries. I have also downloaded the GStreamer SDK
> and have been looking at ~slomo/gst-sdk-tutorials. I am confused and can't
> seem to 'put it all together'. I have read and built and executed (on my
> Android phone) some of the pure Android samples, including JNI samples. I
> feel that I could convert a GStreamer Android SDK based tutorial to the
> Android Studio structure.
>
> Here are the questions that I immediately don't understand.
> 1. Do I need both the 1.4.5 binaries and the GStreamer SDK?

The GStreamer 1.4.5 binaries contain everything that the "GStreamer SDK"
contains, just 3 years newer.

> 2. Do I need to build anything to get started working with the GStreamer
> tutorials?

You just need to extract the binaries to some please and then set
GSTREAMER_ROOT_ANDROID in the environment to that place. Then you can
just build them like any other Android project.

> 3. Tutorial #1 imports package org.freedesktop.gstreamer.GStreamer, which I
> don't think that I have. How should I build it, or where is it?

That's autogenerated by ndk-build.

> 4. Which tutorials are more current, ~slomo or the GStreamer SDK?

See above :)

> 5. Is it possible to run something like the command line gst-launch
> application on Android to test pipelines and installations?

Yes but command line applications don't have access to the hardware
codecs and other things, and you need a rooted device.

See
https://coaxion.net/blog/2014/10/gstreamer-remote-controlled-testing-application-for-android-ios-and-more/
for some gst-launch style application for Android/iOS.

Also see
https://github.com/sdroege/gst-player
for some (hopefully) cleaner code (than the tutorials) for how to do
GStreamer Android development by properly splitting the backend (C) and
the frontend (Java).

--
Sebastian Dröge, Centricular Ltd · http://www.centricular.com

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[Chuck Crisler-2]

Thank you *VERY MUCH* for the help. I suspected that the SDK was old. It would be helpful if there was a note added to the (real) GStreamer website to that effect.

On Fri, Mar 20, 2015 at 4:54 AM, Sérgio Agostinho <[hidden email]> wrote:

Hi Chuck, 

This might also be useful. I remember I struggled for a while to properly build Gstreamer with Android Studio. Place your Android.mk and Application.mk inside src/main/jni

Add these snippets to your local.properties file

android{
    //otherstuff
    sourceSets.main {
        jniLibs.srcDir 'src/main/libs'
        jni.srcDirs = [];
    }
    tasks.withType(JavaCompile) {
        compileTask -> compileTask.dependsOn ndkBuild
    }
    task('ndkBuild', type: Exec) {
        // normal building tool
        commandLine 'ndk-build', 'clean'
        commandLine 'ndk-build', 'APP_PLATFORM=<replace with target version e.g. android-19>', '-C', file('src/main').absolutePath
    }
}

This ensures your ndk code will always be compiled before your java code, and that the Gstreamer.java will be already in your src folder. 

Cheers

2015-03-20 9:41 GMT+01:00 Sebastian Dröge <[hidden email]>:

On Do, 2015-03-19 at 22:30 -0400, Chuck Crisler wrote:
> I am trying to learn Java and Android development at the same time.
> Fortunately, I know GStreamer fairly well. I have the Android Studio, the
> SDK and the NDK installed on my Linux system and have downloaded the
> GStreamer 1.4.5 ARM v7 binaries. I have also downloaded the GStreamer SDK
> and have been looking at ~slomo/gst-sdk-tutorials. I am confused and can't
> seem to 'put it all together'. I have read and built and executed (on my
> Android phone) some of the pure Android samples, including JNI samples. I
> feel that I could convert a GStreamer Android SDK based tutorial to the
> Android Studio structure.
>
> Here are the questions that I immediately don't understand.
> 1. Do I need both the 1.4.5 binaries and the GStreamer SDK?

The GStreamer 1.4.5 binaries contain everything that the "GStreamer SDK"
contains, just 3 years newer.

> 2. Do I need to build anything to get started working with the GStreamer
> tutorials?

You just need to extract the binaries to some please and then set
GSTREAMER_ROOT_ANDROID in the environment to that place. Then you can
just build them like any other Android project.

> 3. Tutorial #1 imports package org.freedesktop.gstreamer.GStreamer, which I
> don't think that I have. How should I build it, or where is it?

That's autogenerated by ndk-build.

> 4. Which tutorials are more current, ~slomo or the GStreamer SDK?

See above :)

> 5. Is it possible to run something like the command line gst-launch
> application on Android to test pipelines and installations?

Yes but command line applications don't have access to the hardware
codecs and other things, and you need a rooted device.

See
https://coaxion.net/blog/2014/10/gstreamer-remote-controlled-testing-application-for-android-ios-and-more/
for some gst-launch style application for Android/iOS.

Also see
https://github.com/sdroege/gst-player
for some (hopefully) cleaner code (than the tutorials) for how to do
GStreamer Android development by properly splitting the backend (C) and
the frontend (Java).

--
Sebastian Dröge, Centricular Ltd · http://www.centricular.com

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gstreamer-devel mailing list
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[Forzaferrarileo]

Hi , I'm trying to use your snippet , but ndk-build isn't generating java packages (  org.freedesktop.gstreamer.Gstreamer ... they're missing ).  native libs are generated without problems .

I'm using ndk r10d and gstreamer 1.4.5 . There are other steps beyond those provided ?

I'm trying tutorial 1 from slomo's repo : http://cgit.freedesktop.org/~slomo/gst-sdk-tutorials/

[Sérgio Agostinho]

If you we're mentioning the snippet I posted for Android studio, you need to have this env defined in your Android.mk

GSTREAMER_JAVA_SRC_DIR := java

Otherwise, the file will not be copied into the proper place.

Cheers

2015-04-02 22:46 GMT+02:00 Forzaferrarileo <[hidden email]>:

Hi , I'm trying to use your snippet , but ndk-build isn't generating java
packages (  org.freedesktop.gstreamer.Gstreamer ... they're missing ).
native libs are generated without problems .

I'm using ndk r10d and gstreamer 1.4.5 . There are other steps beyond those
provided ?

I'm trying tutorial 1 from slomo's repo :
http://cgit.freedesktop.org/~slomo/gst-sdk-tutorials/



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[Forzaferrarileo]

Thank you,  I'm going to try it as soon as possible

[Forzaferrarileo]

i tried to add GSTREAMER_JAVA_SRC_DIR := java  , but the result is the same.. I can't figure out the problem ( in eclipse everything works fine )

I uploaded the whole code here :
https://bitbucket.org/Forzaferrarileo/gstreamer-androidstudio
could you please watch it ?


Thank you
Leonardo

[Sérgio Agostinho]

Hi Leonardo, 

So I downloaded your code, created a new project and imported your 'app' module into it. Then I noticed your Android.mk had these lines

ifndef GSTREAMER_SDK_ROOT

ifndef GSTREAMER_SDK_ROOT_ANDROID

$(error GSTREAMER_SDK_ROOT_ANDROID is not defined!)

endif

GSTREAMER_SDK_ROOT        := $(GSTREAMER_SDK_ROOT_ANDROID)

endif

GSTREAMER_NDK_BUILD_PATH  := $(GSTREAMER_SDK_ROOT)/share/gst-android/ndk-build

which is strange since the env that 1.4.5 uses is

GSTREAMER_ROOT

So I set the env, added 

import org.freedesktop.gstreamer.GStreamer;

into your main activity and voilá, the file got copied into the right place and no more complains about the missing Gstreamer class. Then I noticed you had the following file and folder structure (from a previous build I guess)

src/main/src/com/gstreamer/Gstreamer.java

My preliminary conclusion is that you are not using 1.4.5 and you're using the android binaries from gstreamer.com.

Cheers, 

Sérgio

2015-04-03 22:45 GMT+02:00 Forzaferrarileo <[hidden email]>:

i tried to add GSTREAMER_JAVA_SRC_DIR := java  , but the result is the same..
I can't figure out the problem ( in eclipse everything works fine )

I uploaded the whole code here :
https://bitbucket.org/Forzaferrarileo/gstreamer-androidstudio
could you please watch it ?


Thank you
Leonardo



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[Forzaferrarileo]

Thanks for the tips ; anyway I resolved downloading again ndk and gstreamer sdk ( i was using 1.4.4 , but maybe something got broken ).

Although wasn't the right one , the env didn't cause any trouble because I defined the gst sdk path in it.

Leonardo

[pedjaman]

There are very helpful instructions.
However, latest gstreamer is asking for gold linker which doesn't seems to exists in NDK linux where I'm developing for armv7.
Any idea how to install gold linker?

[pedjaman]

Additional info:
it is building using mipsel-linux-android-4.9 and r12 NDK for linux if that matters.

[pedjaman]

After some research, only after downgrading ndk to 10e, changing targt to arm (isntead of armv7) it finds gold linker (and it doesn't look for mipsel) but this code is failing in gstreamer-1.0.mk:

        @$(foreach plugin,$(GSTREAMER_PLUGINS_WITH_CLASSES), \
                $(call host-mkdir,$(GSTREAMER_JAVA_SRC_DIR)/org/freedesktop/gstreamer/$(plugin)) && ) echo Done mkdir

with error:
/bin/sh: Done: command not found

It seems

echo Done mkdir

is not interpreted as message. It is threated asn command instead.

[Arun Raghavan-4]

On Sat, 10 Sep 2016, at 06:12 PM, pedjaman wrote:
> There are very helpful instructions.
> However, latest gstreamer is asking for gold linker which doesn't seems
> to
> exists on linux where I'm developing.
> Any idea how to install gold linker?

With the most recent unstable releases (1.9.2), we made some changes to
support NDK r12b. I wrote about these at:

  https://arunraghavan.net/2016/09/gstreamer-on-android-and-universal-builds/

Our documentation on this can certainly improve, but in the mean time, a
more complete example of how you can integrate GStreamer on Android can
be seen at:

  https://cgit.freedesktop.org/gstreamer/gst-examples/tree/playback/player/android

Cheers,
Arun
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[enthusiastic geek]

One may start from here. I have tested this on Android Studio 3.0 and
Gstreamer prebuilt binaries 1.4.4
https://github.com/enthusiasticgeek/Gstreamer_Android_Tutorials



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