stagefright框架(五)-Video Rendering
来源:互联网 发布:独上织造棉麻淘宝 女装 编辑:程序博客网 时间:2024/05/22 13:37
(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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