基于OpenMAX IL的安卓曲面HW渲染
我想使用OMX渲染器，如下所述：http://www.slideshare.net/RaghavanVenkateswaran/iomx-in-android
操作系统：Android2.3.4
使用的系统库： libmedia，libbinder，libstagefright，libutils
我的设备上的OMX组件：
componentName: OMX.ITTIAM.AAC.decode，componentRole: audio_decoder.aac
componentName: OMX.ITTIAM.AAC.encode，componentRole: audio_encoder.aac
componentName: OMX.TI.720P.Decoder，componentRole: video_decoder.mpeg4
componentName: OMX.TI.720P.Decoder，componentRole: video_decoder.avc
componentName: OMX.TI.720P.Encoder，componentRole: video_encoder.mpeg4
componentName: OMX.TI.720P.Encoder，componentRole: video_encoder.avc
componentName: OMX.TI.AAC.decode，componentRole: audio_decoder.aac
componentName: OMX.TI.AAC.encode，componentRole: audio_encoder.aac
componentName: OMX.TI.AMR.decode，componentRole: audio_decoder.amrnb
componentName: OMX.TI.AMR.encode，componentRole: audio_encoder.amrnb
componentName: OMX.TI.Camera，componentRole: camera.yuv
componentName: OMX.TI.JPEG.decoder，componentRole: image_decoder.jpeg
componentName: OMX.TI.JPEG.encoder，componentRole: image_encoder.jpeg
componentName: OMXTI.MP3.解码器，componentRole: audio_decoder.mp3
componentName: OMX.TI.VPP，componentRole: iv_renderer.yuv.overlay
componentName: OMX.TI.Video.Decoder，componentRole: video_decoder.h263
componentName: OMX.TI.Video.Decoder，componentRole: video_decoder.avc
componentName: OMX.TI.Video.Decoder，componentRole: video_decoder.mpeg2
componentName: OMX.TI.Video.Decoder，componentRole: video_decoder.mpeg4
componentName: OMX.TI.Video.Decoder，componentRole: video_decoder.wmv
componentName: OMX.TI.Video.encoder，componentRole: video_encoder.mpeg4
componentName: OMX.TI.Video.encoder，componentRole: video_encoder.h263
componentName: OMX.TI.Video.encoder，componentRole: video_encoder.avc
componentName: OMX.TI.WBAMR.decode，componentRole: audio_decoder.amrwb
componentName: OMX.TI.WBAMR.encode，componentRole: audio_encoder.amrwb
componentName: OMX.TI.WMA.decode，componentRole: audio_decoder.wma
我已经完成了以下步骤：
1 )以这种方式通过JNI传递Android对象(与本机MediaPlayer完全相同)：
JNI (C++):
static void com_mautilus_media_MMediaPlayer_setVideoSurface(JNIEnv *env, jobject thiz)
{
__android_log_print(ANDROID_LOG_INFO, TAG, "setVideoSurface");
MMediaPlayer *mp = getMediaPlayer(env, thiz);
if (mp == NULL )
{
jniThrowException(env, "java/lang/IllegalStateException", NULL);
return;
}
setVideoSurface(mp, env, thiz);
}
static void setVideoSurface(MMediaPlayer *mp, JNIEnv *env, jobject thiz)
{
__android_log_print(ANDROID_LOG_INFO, TAG, "setVideoSurface");
jobject surface = env->GetObjectField(thiz, fields.surface);
if (surface != NULL && mp != NULL)
{
const android::sp<android::Surface> native_surface = get_surface(env, surface);
mp->setVideoSurface(native_surface);
}
}MMediaPlayer中的表面变量声明为：
android::sp<android::Surface> surface;Java:
private Surface mSurface; // accessed by native methods
private SurfaceHolder mSurfaceHolder;
public void setDisplay(SurfaceHolder sh)
{
mSurfaceHolder = sh;
if (sh != null)
{
mSurface = sh.getSurface();
}
else
{
mSurface = null;
}
setVideoSurface(); // Native function call
}2，初始化IOMX节点：
注意:硬编码的值仅用于简单性和测试目的。
android::sp<android::IServiceManager> serviceManager = android::defaultServiceManager();
android::sp<android::IBinder> binder = serviceManager>getService(android::String16("media.player"));
android::sp<android::IMediaPlayerService> mediaPlayerService = android::interface_cast<android::IMediaPlayerService>(binder);
android::sp<android::IOMX> iomx = mediaPlayerService->getOMX();
android::IOMX::node_id node;
// observer is instance of class derived from android::BnOMXObserver class
iomx->allocateNode("OMX.TI.VPP", observer, &mRendererNode->node);
OMX_PARAM_PORTDEFINITIONTYPE portDefn;
portDefn.nPortIndex = 1;
iomx->getParameter(node, OMX_IndexParamPortDefinition, &portDefn, sizeof(portDefn));
//portDefn.nBufferCountActual = mInBufCnt; // set some suitable value here or don’t update to
//use default value
portDefn.format.video.nFrameWidth = 256; // width of the video to be played
portDefn.format.video.nFrameHeight = 144; // height of video to be played
portDefn.format.video.nStride = 256;
portDefn.format.video.nSliceHeight = 144;
iomx->setParameter(node, OMX_IndexParamPortDefinition, &portDefn, sizeof(portDefn));
portDefn.nPortIndex = 2;
iomx->getParameter(node, OMX_IndexParamPortDefinition, &portDefn, sizeof(portDefn));
//portDefn.nBufferCountActual = iOutBufCnt; // set suitable value or leave to default.
portDefn.nBufferSize = (256 * 144 * 3) / 2;
portDefn.format.video.nFrameWidth = 256;
portDefn.format.video.nFrameHeight = 144;
portDefn.format.video.nStride = 256;
portDefn.format.video.nSliceHeight = 144;
iomx->setParameter(node, OMX_IndexParamPortDefinition, &portDefn, sizeof(portDefn));3，尝试创建OMX：
android::sp<android::IOMXRenderer> mOMXRenderer;
mOMXRenderer = omxContext->iomx->createRenderer(surface, "OMX.TI.VPP", OMX_COLOR_FormatYUV420Planar, 256, 144, displayWidth, displayHeight, 0);它总是返回NULL。
有人知道这是怎么回事吗？我是否初始化了错误的组件？还是一定有一些特殊的呼叫顺序？还是别的什么？
回答 1
Stack Overflow用户
发布于 2012-12-18 19:11:10
使用IOMX.h中定义的createRendererFromJavaSurface
https://stackoverflow.com/questions/13730356
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