RGB to yuv420sp

[morris_horesh]

Hi,
I am trying to encode h264 video in realtime on android. The HW accelerated encoder requires yuv420sp encoded frames. Unfortunately, the input device generates RGB888/RGB565. It takes way too long to make the conversion on the CPU. I need a way to make the conversion on the GPU. I was thinking of a OpenGL shader but I'm not quite sure how to do it. I'm not even sure whether or not it is the best solution.

Help would be appreciated.

Cheers
Morris Horesh

[jasonme]

Back up a sec, it's possible to call HW video encoder on Android devices using Android APIs or native calls? I mean if I have yuv420 data available on the device, I can call the HW encoder interfaces to encode to a H.264 stream? I wonder how that's done, it would be great if you can point me some materials to read.

Thanks a lot in advance.

[morris_horesh]

I come here asking questions and I end up giving answers. I wonder if that would cause a Karma endless loop :)

Android has a NDK OMX interface. I am using a rooted device so I can't tell you whether or not you can use it otherwise.

this code may get you started:

// some of these includes may not be required for this sample. I just copied everything
#include <binder/IServiceManager.h>
#include <binder/ProcessState.h>
#include <media/IMediaPlayerService.h>
#include <media/stagefright/MediaBuffer.h>
#include <media/stagefright/MediaDebug.h>
#include <media/stagefright/MediaDefs.h>
#include <media/stagefright/OMXClient.h>
#include <media/stagefright/MediaSource.h>
#include <pthread.h>
#include <media/IOMX.h>
#include <binder/MemoryDealer.h>
#include <OMX_Component.h>


// get omx handle
sp<IServiceManager> sm = defaultServiceManager();
sp<IBinder> binder = sm->getService(String16("media.player"));
sp<IMediaPlayerService> service = interface_cast<IMediaPlayerService>(binder);
sp<IOMX> iomx = service->getOMX();

List<IOMX::ComponentInfo> list; // list of componentName
List<IOMX::ComponentInfo>::iterator it; // iterator to list through
iomx->listNodes(&list);

// display all supported codecs
for ( it = list.begin(); it != list.end(); ++it)
printf("%s\n",(*it).mName.string());