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A Tutorial to DirectShow презентация
Содержание
- 1. A Tutorial to DirectShow
- 2. What is DirectShow A part of the
- 3. DirectShow Overview
- 4. Pros and Cons Benefits Very very flexible
- 5. DirectShow Filters The basic building block, which
- 6. Filter Graph Several filters connected together to perform a specific task
- 7. Filter Graph Manager High-level API to the
- 8. Demo Graph Builder (mssdk→DirectX utility→Graph Builder)
- 9. Writing a Dshow App. DirectShow API through
- 10. Three steps Create filter graph ganager (FGM)
- 11. “Hello World” COM Init, Remember this
- 12. Building Filter Graph Add filters to the
- 13. Frame grabber Sample Grabber Filter
- 14. A Few Tips Multi-thread Avoid in-place transform
- 15. References MSDN
What is DirectShow A part of the DirectX family Play almost any type of media Dx8.1
Слайд 4Pros and Cons
Benefits
Very very flexible architecture
Reusable components (filters)
Downside
You are doomed with
M$
Learn the Window programming
MFC (you don’t have to, but better to)
Learn the Window programming
MFC (you don’t have to, but better to)
Слайд 5DirectShow Filters
The basic building block, which can
Read files.
Get video from
a video capture device.
Code/decode streams
Pass data to the graphics or sound card.
Code/decode streams
Pass data to the graphics or sound card.
An sample MPEG filter
Слайд 7Filter Graph Manager
High-level API to the APP
Controls the data flow in
the filters
Simple API
AddFilter, queryInterface
Run, stop, and pause
Simple API
AddFilter, queryInterface
Run, stop, and pause
Слайд 9Writing a Dshow App.
DirectShow API through COM interface
Component Object Model (COM)
Getting
a pointer to the interface
ptr = CoCreateInstance(…)
Release the pointer after you are done
ptr->Release()
ptr = CoCreateInstance(…)
Release the pointer after you are done
ptr->Release()
Слайд 10Three steps
Create filter graph ganager (FGM)
Create the filter graph (through FGM)
Run
the graph and respond to event
Слайд 11
“Hello World”
COM Init, Remember this
Release COM pointer
#include
void main(void) {
IGraphBuilder *pGraph; IMediaControl *pMediaControl; IMediaEvent *pEvent;
CoInitialize(NULL);
// Create the filter graph manager and query for interfaces. CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&pGraph);
pGraph->QueryInterface(IID_IMediaControl, (void **)&pMediaControl);
pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);
// Build the graph.
pGraph->RenderFile(L"C:\\Hello_World.avi", NULL);
pMediaControl->Run(); // Run the graph.
pEvent->WaitForCompletion(INFINITE, &evCode); // Wait for completion.
// Clean up.
pMediaControl->Release(); pEvent->Release(); pGraph->Release();
CoUninitialize(); }
Слайд 12Building Filter Graph
Add filters to the FGM
Two ways
“Intelligent” connect (as in
previous example)
Manual connect (pout→ pin)
Format negotiation
Manual connect (pout→ pin)
Format negotiation
Слайд 14A Few Tips
Multi-thread
Avoid in-place transform filter
Image origins
A few useful filters
Color space
converter
T-adaptor
Stream-multiplex
T-adaptor
Stream-multiplex
