Ok, I get your point
Thanks for your help
On Oct 26, 5:56 pm, David Turner <di...@android.com> wrote:
> On Wed, Oct 26, 2011 at 1:19 AM, HamdiHamZ <hamdi.zr...@gmail.com> wrote:
> > Hi Dianne and thank you for your reply,
>
> > Sorry, I can't get your point, do you mean that we can't use C++
> > at all with the NDK? So why we can see cpp classes in the android
> > sources? is it only to build libs and after that libs should be used
> > from Java?
>
> No, it simply means you can't write code that tries to access internal C++
> classes from the platform because these are not exposed by the NDK.
>
> In other words, you're trying to access functions that are used by the
> system, but not available to applications because they can (and will be) be
> modified or removed at will between platform releases, or simply in custom
> ROMs.
>
>
>
>
>
>
>
> > Regards,
>
> > On Oct 25, 8:38 pm, Dianne Hackborn <hack...@android.com> wrote:
> > > This is not part of the NDK. *NO* C++ classes are part of the NDK.
>
> > > Even if you manage to get this to work, you are using private
> > implementation
> > > details of the platform, and I can guarantee you that your app will break
> > > all over the place on different devices.
>
> > > On Tue, Oct 25, 2011 at 1:36 AM, HamdiHamZ <hamdi.zr...@gmail.com>
> > wrote:
> > > > Hi folks,
>
> > > > I ma trying to write a media player for Android 2.2. I am using
> > > > NDK_rb6 to build my JNI library written i C/C++ (under Ubuntu
> > > > 11.04)... Actually, I faced a lot of problems of linking and
> > > > dependencies, I resolved a lot of the and I am stuck with this one:
>
> > > > ~/dev/workspace/MyApp/jni/android-out.cpp:95: undefined reference to
> > > > `android::AudioTrack::set(int, unsigned int, int, int, int, unsigned
> > > > int, void (*)(int, void*, void*), void*, int,
> > > > android::sp<android::IMemory> const&, bool, int)'
> > > > collect2: ld returned 1 exit status
>
> > > > However, I found its definition in $(ANDROID_SRC)/frameworks/base/
> > > > media/libmedia/AudioTrack.cpp:
>
> > > > status_t AudioTrack::set(
> > > > int streamType,
> > > > uint32_t sampleRate,
> > > > int format,
> > > > int channels,
> > > > int frameCount,
> > > > uint32_t flags,
> > > > callback_t cbf,
> > > > void* user,
> > > > int notificationFrames,
> > > > const sp<IMemory>& sharedBuffer,
> > > > bool threadCanCallJava,
> > > > int sessionId)
> > > > {
> > > > ...
> > > > }
>
> > > > and in the header that I included (media/audioTrack.h):
>
> > > > /* Initialize an uninitialized AudioTrack.
> > > > * Returned status (from utils/Errors.h) can be:
> > > > * - NO_ERROR: successful intialization
> > > > * - INVALID_OPERATION: AudioTrack is already intitialized
> > > > * - BAD_VALUE: invalid parameter (channels, format,
> > > > sampleRate...)
> > > > * - NO_INIT: audio server or audio hardware not initialized
> > > > * */
> > > > status_t set(int streamType =-1,
> > > > uint32_t sampleRate = 0,
> > > > int format = 0,
> > > > int channels = 0,
> > > > int frameCount = 0,
> > > > uint32_t flags = 0,
> > > > callback_t cbf = 0,
> > > > void* user = 0,
> > > > int notificationFrames = 0,
> > > > const sp<IMemory>& sharedBuffer = 0,
> > > > bool threadCanCallJava = false,
> > > > int sessionId = 0);
>
> > > > and I am using it this way:
>
> > > > status = track->set(AudioSystem::MUSIC,
> > > > audec->samplerate,
> > > > AudioSystem::PCM_16_BIT,
> > > > (audec->channels == 1) ?
> > > > AudioSystem::CHANNEL_OUT_MONO : AudioSystem::CHANNEL_OUT_STEREO,
> > > > 0, // frameCount
> > > > 0, // flags
> > > > audioCallback,
> > > > audec, // user when callback
> > > > 0, // notificationFrames
> > > > 0, // shared buffer
> > > > 0);
>
> > > > So I am not able to see where am I wrong?
>
> > > > --
> > > > You received this message because you are subscribed to the Google
> > > > Groups "Android Developers" group.
> > > > To post to this group, send email to
> > android-developers@googlegroups.com
> > > > To unsubscribe from this group, send email to
> > > > android-developers+unsubscr...@googlegroups.com
> > > > For more options, visit this group at
> > > >http://groups.google.com/group/android-developers?hl=en
>
> > > --
> > > Dianne Hackborn
> > > Android framework engineer
> > > hack...@android.com
>
> > > Note: please don't send private questions to me, as I don't have time to
> > > provide private support, and so won't reply to such e-mails. All such
> > > questions should be posted on public forums, where I and others can see
> > and
> > > answer them.
>
> > --
> > You received this message because you are subscribed to the Google
> > Groups "Android Developers" group.
> > To post to this group, send email to android-developers@googlegroups.com
> > To unsubscribe from this group, send email to
> > android-developers+unsubscr...@googlegroups.com
> > For more options, visit this group at
> >http://groups.google.com/group/android-developers?hl=en
--
You received this message because you are subscribed to the Google
Groups "Android Developers" group.
To post to this group, send email to android-developers@googlegroups.com
To unsubscribe from this group, send email to
android-developers+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en
