Make media loop many times with direct show c++ - c++

I am using direct show to play media files within my program, and i have been able to play a media file a single time using the following code.
void main()
{
IGraphBuilder *pGraph = NULL;
IMediaControl *pControl = NULL;
IMediaEvent *pEvent = NULL;
HRESULT hr = CoInitialize(NULL);
if (FAILED(hr))
{
printf("ERROR - Could not initialize COM library");
}
hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&pGraph);
if (FAILED(hr))
{
printf("ERROR - Could not create the Filter Graph Manager.");
}
hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl);
hr = pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);
hr = pGraph->RenderFile(L"C:\\Example.mp3", NULL);
if (SUCCEEDED(hr))
{
hr = pControl->Run();
if (SUCCEEDED(hr))
{
long evCode;
pEvent->WaitForCompletion(INFINITE, &evCode);
}
}
pControl->Release();
pEvent->Release();
pGraph->Release();
CoUninitialize();
return;
}
My question then becomes how would i make the file continue to play and repeat itself a given number of times, or infinitely if i so desired. IMediaControl has no member named loop.

There is no built in way to do this. Once way of implementing this is that instead of exiting you function when you get the completion event, you seek to the beginning of the file an start playback again.
The following link on event handling may help: Learning When an Event Occurs. EC_COMPLETE event/notification is issued when streaming is complete.

Related

Create borderless DirectShow Window

I am referring to this simple video player using DirectShow example provided here.
The code runs and builds however I need to make the video player window borderless.
I could not find a parameter to set in the CoCreateInstance function or the CoInitialize function which I can set to make the window borderless.
Here is my complete code for reference:
#include <dshow.h>
#pragma comment (lib, "strmiids.lib")
void main(void)
{
IGraphBuilder *pGraph = NULL;
IMediaControl *pControl = NULL;
IMediaEvent *pEvent = NULL;
// Initialize the COM library.
HRESULT hr = CoInitialize(NULL);
if (FAILED(hr))
{
printf("ERROR - Could not initialize COM library");
return;
}
// Create the filter graph manager and query for interfaces.
hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER,
IID_IGraphBuilder, (void **)&pGraph);
if (FAILED(hr))
{
printf("ERROR - Could not create the Filter Graph Manager.");
return;
}
hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl);
hr = pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);
// Build the graph. IMPORTANT: Change this string to a file on your system.
hr = pGraph->RenderFile(L"D:\\dfs.avi", NULL);
if (SUCCEEDED(hr))
{
// Run the graph.
hr = pControl->Run();
if (SUCCEEDED(hr))
{
// Wait for completion.
long evCode;
pEvent->WaitForCompletion(INFINITE, &evCode);
// Note: Do not use INFINITE in a real application, because it
// can block indefinitely.
}
}
pControl->Release();
pEvent->Release();
pGraph->Release();
CoUninitialize();
}
What additional piece of code do I need to add in order to achieve this?
I found this code here which does the job!
#pragma comment(lib, "strmiids.lib")
#pragma comment(lib, "quartz.lib")
#include <string>
#include <dshow.h>
int PlayVideo(const std::string& pFile)
{
IGraphBuilder* pGraph = NULL;
IVideoWindow* pWin = NULL;
IMediaControl* pControl = NULL;
IMediaEvent* pEvent = NULL;
// Initialize the COM library.
HRESULT hr = CoInitialize(NULL);
if (FAILED(hr)) return 1;
// Create the filter graph manager and query for interfaces.
hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **)&pGraph);
if (FAILED(hr)) return 1;
// Get interfaces
hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl);
hr = pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);
hr = pGraph->QueryInterface(IID_IVideoWindow, (void **)&pWin);
// Build the graph (convert unicode filename)
size_t _size = mbstowcs(NULL,pFile.c_str(),2); // Add 2 for ZT
wchar_t* _wfile = new wchar_t[_size + 2];
_size = mbstowcs(_wfile, pFile.c_str(), pFile.length() + 1); // Add 1 for ZT
hr = pGraph->RenderFile(_wfile, NULL);
delete[] _wfile;
// Uncomment next line for borderless window display
pWin->put_WindowStyle(WS_CHILD | WS_CLIPSIBLINGS);
// For fullscreen play, get Windows screen parameters and replace
pWin->SetWindowPosition(0, 0, 800, 600);
if (SUCCEEDED(hr))
{
hr = pControl->Run();
if (SUCCEEDED(hr))
{
long evCode;
pEvent->WaitForCompletion(INFINITE, &evCode);
}
}
pControl->Release();
pEvent->Release();
pWin->Release();
pGraph->Release();
CoUninitialize();
return 0;
}
int main()
{
PlayVideo("D:\\dfs.avi"); // play any format Windows can handle, avi/mpg etc.
return 0;
}

DShow Sample Code for playing video does not play the video MSDN C++

I was referring to the example program provided here to run a video file, in my case mp4 format using DShow.
Refer to the complete code:
#include <dshow.h>
#pragma comment (lib, "strmiids.lib")
void main(void)
{
IGraphBuilder *pGraph = NULL;
IMediaControl *pControl = NULL;
IMediaEvent *pEvent = NULL;
// Initialize the COM library.
HRESULT hr = CoInitialize(NULL);
if (FAILED(hr))
{
printf("ERROR - Could not initialize COM library");
return;
}
// Create the filter graph manager and query for interfaces.
hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER,
IID_IGraphBuilder, (void **)&pGraph);
if (FAILED(hr))
{
printf("ERROR - Could not create the Filter Graph Manager.");
return;
}
hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl);
hr = pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);
// Build the graph. IMPORTANT: Change this string to a file on your system.
hr = pGraph->RenderFile(L"C:\\Example.avi", NULL);
if (SUCCEEDED(hr))
{
// Run the graph.
hr = pControl->Run();
if (SUCCEEDED(hr))
{
// Wait for completion.
long evCode;
pEvent->WaitForCompletion(INFINITE, &evCode);
// Note: Do not use INFINITE in a real application, because it
// can block indefinitely.
}
}
pControl->Release();
pEvent->Release();
pGraph->Release();
CoUninitialize();
}
However when I build the program, the build is sucessful but when I run it, the console window pops up and disappears within a second.
I referred to the comments on the same page and many others faced the same issue. However a few were able to successfully run the program.
What is it that I am doing wrong?
Is it the type of project I am selecting? I am selecting win32 console application. Should I select something else? Or is there something else that I am doing wrong?

How to use DirectShow and webcam to preview an image

I'm trying to use C++ and DirectShow to display my webcam... but I'm having some troubles.
The following code gives me a segmentation fault on:
m_pDF->EnumPins(&pinEnum);
my cpp code:
#include <tchar.h>
#include <strsafe.h>
#include <dshow.h>
#include <atlbase.h>
#include <d3d9.h>
#include <vmr9.h>
#pragma comment(lib,"Strmiids.lib")
#define SAFE_RELEASE(x) { if (x) x->Release(); x = NULL; }
HRESULT EnumerateDevices(REFGUID category, IEnumMoniker **ppEnum)
{
// Create the System Device Enumerator.
ICreateDevEnum *pDevEnum; // Video and Audio interface object
HRESULT hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pDevEnum)); // Creates the system device enumerator
if (SUCCEEDED(hr))
{
// Create an enumerator for the category.
hr = pDevEnum->CreateClassEnumerator(category, ppEnum, 0); // Enumeration of 'category' objects
if (hr == S_FALSE)
{
hr = VFW_E_NOT_FOUND; // The category is empty. Treat as an error.
}
pDevEnum->Release(); // Deletes Enumeration object
}
return hr;
}
void main(void)
{
IGraphBuilder *pGraph = NULL;
IMediaControl *pControl = NULL; // contains methods for stopping and starting the graph
IMediaEvent *pEvent = NULL; // methods for getting events from the Filter Graph Manager
IPin *m_pCamOutPin;
IBaseFilter *m_pDF=NULL;
IMoniker *pM;
IEnumMoniker *pEnum; // Enumerator object
// Initialize the COM library.
HRESULT hr = CoInitialize(NULL);
if (FAILED(hr))
{
printf("ERROR - Could not initialize COM library");
return;
}
// Create the filter graph manager and query for interfaces.
hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER,
IID_IGraphBuilder, (void **)&pGraph);
if (FAILED(hr))
{
printf("ERROR - Could not create the Filter Graph Manager.");
return;
}
// Bind
hr = EnumerateDevices(CLSID_VideoInputDeviceCategory, &pEnum);
pEnum->Next(1, &pM, NULL);
pM->BindToObject(0, 0, IID_IBaseFilter, (void**)m_pDF);
pM->Release();
hr=pGraph->AddFilter(m_pDF, L"Video Capture");
CComPtr<IEnumPins> pinEnum;
m_pDF->EnumPins(&pinEnum);
hr = pinEnum->Reset();
hr = pinEnum->Next(1, &m_pCamOutPin, NULL);
if (FAILED(hr))
return;
// control
hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl);
hr = pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);
// Build the graph. IMPORTANT: Change this string to a file on your system.
hr = pGraph->Render(m_pCamOutPin);
if (SUCCEEDED(hr))
{
// Run the graph.
hr = pControl->Run();
if (SUCCEEDED(hr))
{
// Wait for completion.
long evCode;
pEvent->WaitForCompletion(INFINITE, &evCode);
// Note: Do not use INFINITE in a real application, because it
// can block indefinitely.
}
}
SAFE_RELEASE(pControl);
SAFE_RELEASE(pEvent);
SAFE_RELEASE(pGraph);
CoUninitialize();
}
Any ideas on what am I doing wrong and what do I have to do to get this to work?
m_pDF is a pointer to IBaseFilter:
IBaseFilter *m_pDF=NULL;
BindToObject last parameter is a pointer to a pointer. Which means this functioncall is wrong:
pM->BindToObject(0, 0, IID_IBaseFilter, (void**)m_pDF);
Instead you need to pass the address of m_pDF to get a pointer to a pointer:
pM->BindToObject(0, 0, IID_IBaseFilter, (void**)&m_pDF);
It is not a problem to cast IBaseFilter** to void**, but you can't cast IBaseFilter* to void**.
The crash should be related m_pDF, it not be a valid pointer.
you should add check for pM->BindToObject(0, 0, IID_IBaseFilter, (void**)m_pDF); to know that m_pDF is initialize sucess or not.
and you should also check hr=pGraph->AddFilter(m_pDF, L"Video Capture"); hr is ok or not.
if fail, you can get the error code know the reason.

DirectShow dilemma - Not able to record

That's the actual main code, preview works fine:
int main()
{
HRESULT hr = CoInitialize(NULL);
ICaptureGraphBuilder2 *pBuild;
IGraphBuilder *pGraph;
IMoniker *pMoniker;
IMediaControl *pControl;
IMediaEvent *pEvent;
InitCaptureGraphBuilder(&pGraph, &pBuild);
hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl);
hr = pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);
IBaseFilter *pCap; // Video capture filter
IEnumMoniker *pEnum;
hr = EnumerateDevices(CLSID_VideoInputDeviceCategory, &pEnum);
DisplayDeviceInformation(pEnum, &pMoniker);
hr = pMoniker->BindToObject(0, 0, IID_IBaseFilter, (void**)&pCap);
if (SUCCEEDED(hr))
{
hr = pGraph->AddFilter(pCap, L"Capture Filter");
}
hr = pBuild->RenderStream(&PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video, pCap, NULL, NULL);
hr = pControl->Run();
_getch();
pControl->Release();
pCap->Release();
pGraph->Release();
pBuild->Release();
CoUninitialize();
return 0;
}
Now, I know that for recording I need this piece of code:
IBaseFilter *pMux;
hr = pBuild->SetOutputFileName(&MEDIASUBTYPE_Avi, L"D:\\test.avi", &pMux, NULL);
hr = pBuild->RenderStream(&PIN_CATEGORY_CAPTURE, &MEDIATYPE_Video, pCap, NULL, pMux);
If I replace this to the preview code, it actually create the AVI file (a very big one), but it's empty, no video.
I mean I'm replacing the:
hr = pBuild->RenderStream(&PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video, pCap, NULL, NULL);
code, with the one above.
What I'm doing wrong, or better, what I'm missing?
RenderStream is high level method that internally embeds other calls through public documented APIs, typically for the ease of use. While it looks simple, it's not so easy to troubleshoot in case something does not work well and as expected. Even harder to tell inspecting just code visually. It also is not the most efficient because there is something you can do yourself to get closer to the solution, which is:
Your further steps are along either of the two:
You take working sample code and compare to yours looking at differences and locating the source of the problem.
You inspect the resulting filter graph topology putting your graph onto ROT, and checking using GraphEdit or a similar tool to ensure the topology is matching your expectations.
You also certainly need to check HRESULT codes, what you already seem to be doing.

How to write an avi file with DirectShow

I'm trying to write an avi video file based on the streaming of my Decklink SDI card, after looking in the internet and here I wrote this code by my problem is that the program doesn't write the file here 's the code:
#include <Windows.h>
#include <DShow.h>
#include <iostream>
int main(void)
{
IGraphBuilder* pGraph = NULL;
ICaptureGraphBuilder2* pBuild = NULL;
IMediaControl* pControl = NULL;
ICreateDevEnum* pDevEnum = NULL;
IEnumMoniker* pEnum = NULL;
IMoniker *pMoniker = NULL;
IMoniker* goodMoniker = NULL;
IBaseFilter* pCap;
HRESULT hr;
//Initialize pGraph
hr = CoInitialize(NULL);
hr = CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC_SERVER, IID_IGraphBuilder, (void **) &pGraph);
if(FAILED(hr))
{
printf("ERROR - Could not initialize COM library");
return 1;
}
//Initialize pBuild
hr = CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL, CLSCTX_INPROC_SERVER, IID_ICaptureGraphBuilder2, (void**) &pBuild);
if(FAILED(hr))
{
printf("ERROR - Could not create the Filter Graph Manager.");
return 2;
}
pBuild->SetFiltergraph(pGraph);
hr = CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER, IID_ICreateDevEnum, reinterpret_cast<void**>(&pDevEnum));
if(SUCCEEDED(hr))
{
hr = pDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pEnum, 0);
}
HWND hList;
while(pEnum->Next(1, &pMoniker, NULL) == S_OK)
{
IPropertyBag* pPropBag;
hr = pMoniker->BindToStorage(0, 0, IID_IPropertyBag, (void**)(&pPropBag));
if(FAILED(hr))
{
pMoniker->Release();
continue;
}
VARIANT varName;
VariantInit(&varName);
hr = pPropBag->Read(L"Description", &varName, 0);
if(FAILED(hr))
{
hr = pPropBag->Read(L"FriendlyName", &varName, 0);
}
if(SUCCEEDED(hr))
{
for(int i=0;i<20;i++)
{
std::cout<<(char)*(varName.bstrVal + i);
}
char yn;
std::cin>>yn;
if(yn=='Y')
{
std::cout<<"SUCCESSFUL"<<std::endl;
goodMoniker = pMoniker;
VariantClear(&varName);
}
}
pPropBag->Release();
if(pMoniker != goodMoniker)
{
pMoniker->Release();
}
}
hr = goodMoniker->BindToObject(0, 0, IID_IBaseFilter, (void**)(&pCap));
if(SUCCEEDED(hr))
{
hr = pGraph->AddFilter(pCap, L"Capture Filter");
}
IBaseFilter *pMux = NULL;
// hr = pBuild->RenderStream(&PIN_CATEGORY_PREVIEW, &MEDIATYPE_Video, pCap, NULL, NULL);
hr = pBuild->SetOutputFileName(
&MEDIASUBTYPE_Avi, // Specifies AVI for the target file.
L"C:\\stuff.avi", // File name.
&pCap, // Receives a pointer to the mux.
NULL); // (Optional) Receives a pointer to the file sink.
hr =pBuild->RenderStream(
&PIN_CATEGORY_CAPTURE, // Pin category.
&MEDIATYPE_Video, // Media type.
pCap, // Capture filter.
NULL, // Intermediate filter (optional).
pMux); // Mux or file sink filter.
hr = pCap->QueryInterface(IID_IMediaControl,(void**) pControl);
printf("START ");
hr = pControl->Run();
Sleep(100000);
hr = pControl->Stop();
CoUninitialize();
pGraph->Release();
pBuild->Release();
pCap->Release();
}
here is the error message that I get when I try to debbug it :
Unhandled exception at 0x776015de in STREAMMMMM.exe: 0xC0000005: Access violation reading location 0x00000000.
the program crashes in this line :
r = pCap->QueryInterface(IID_IMediaControl,(void**) pControl);
There are tens, if not hundreds, of examples on how to write into AVI with DirectShow on Internet.
This particular code snippet does not even start writing. It only prepares the pipeline and you are not even doing IMediaControl::Run, what you are supposed to do. Further on, you should wait until you wrote enough, and then stop recording and only then release the interface pointers.
Have a look at this Q: Using a DirectShow filter without registering it, via a private CoCreateInstance on what you are missing to start actual capture and writing (IMediaControl::Run and Sleep in particular).