Stagefright (5) - Video Rendering
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AwesomePlayer::onVideoEvent除了透過OMXCodec::read取得解碼後的資料外,還必須將這些資料(mVideoBuffer)傳給video renderer,以便畫到螢幕上去。
(1) 要將mVideoBuffer中的資料畫出來之前,必須先建立mVideoRenderer
void AwesomePlayer::onVideoEvent()
{
...
if (mVideoRenderer == NULL)
{
initRenderer_l();
}
...
}
void AwesomePlayer::initRenderer_l()
{
if (!strncmp("OMX.", component, 4))
{
mVideoRenderer = new AwesomeRemoteRenderer(
mClient.interface()->createRenderer(
mISurface,
component,
...)); .......... (2)
}
else
{
mVideoRenderer = new AwesomeLocalRenderer(
...,
component,
mISurface); ............................ (3)
}
}
(2) 如果video decoder是OMX component,則建立一個AwesomeRemoteRenderer作為mVideoRenderer
從上段的程式碼(1)來看,AwesomeRemoteRenderer的本質是由OMX::createRenderer所創建的。createRenderer會先建立一個hardware renderer -- SharedVideoRenderer (libstagefrighthw.so);若失敗,則建立software renderer -- SoftwareRenderer (surface)。
sp<IOMXRenderer> OMX::createRenderer(...)
{
VideoRenderer *impl = NULL;
libHandle = dlopen("libstagefrighthw.so", RTLD_NOW);
if (libHandle)
{
CreateRendererFunc func = dlsym(libHandle, ...);
impl = (*func)(...); <----------------- Hardware Renderer
}
if (!impl)
{
impl = new SoftwareRenderer(...); <---- Software Renderer
}
}
(3) 如果video decoder是software component,則建立一個AwesomeLocalRenderer作為mVideoRenderer
AwesomeLocalRenderer的constructor會呼叫本身的init函式,其所做的事和OMX::createRenderer一模一樣。
void AwesomeLocalRenderer::init(...)
{
mLibHandle = dlopen("libstagefrighthw.so", RTLD_NOW);
if (mLibHandle)
{
CreateRendererFunc func = dlsym(...);
mTarget = (*func)(...); <---------------- Hardware Renderer
}
if (mTarget == NULL)
{
mTarget = new SoftwareRenderer(...); <--- Software Renderer
}
}
(4) mVideoRenderer一經建立就可以開始將解碼後的資料傳給它
void AwesomePlayer::onVideoEvent()
{
if (!mVideoBuffer)
{
mVideoSource->read(&mVideoBuffer, ...);
}
[Check Timestamp]
if (mVideoRenderer == NULL)
{
initRenderer_l();
}
mVideoRenderer->render(mVideoBuffer); <----- Render Data
}
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