mpv/loader/dshow/DS_Filter.c

#include <stdio.h>
#include <string.h>
#include "DS_Filter.h"
#include <except.h>
//#include "../loader/loader.h"
#include <string>
#include <iostream>
#define __MODULE__ "DirectShow generic filter"

using namespace std;

typedef long STDCALL (*GETCLASS) (const GUID*, const GUID*, void**);
extern "C" char* def_path;

extern "C" int STDCALL expLoadLibraryA(const char*);
extern "C" STDCALL void* GetProcAddress(int, const char*);
extern "C" int STDCALL FreeLibrary(int);

extern "C" void Setup_LDT_Keeper();
extern "C" void setup_FS_Segment();

DS_Filter::DS_Filter()
    :m_iHandle(0), m_pFilter(0), m_pInputPin(0),
    m_pOutputPin(0), m_pSrcFilter(0), m_pParentFilter(0),
    m_pOurInput(0), m_pOurOutput(0), m_pAll(0), m_pImp(0),
    m_iState(0)
{
}

void DS_Filter::clean()
{
    m_iState = 0;

    if (m_pOurInput)
	m_pOurInput->vt->Release((IUnknown*)m_pOurInput);
    if (m_pInputPin)
	m_pInputPin->vt->Disconnect(m_pInputPin);
    if (m_pOutputPin)
	m_pOutputPin->vt->Disconnect(m_pOutputPin);
    if (m_pFilter)
	m_pFilter->vt->Release((IUnknown*)m_pFilter);
    if (m_pOutputPin)
	m_pOutputPin->vt->Release((IUnknown*)m_pOutputPin);
    if (m_pInputPin)
	m_pInputPin->vt->Release((IUnknown*)m_pInputPin);
    if (m_pImp)
	m_pImp->vt->Release((IUnknown*)m_pImp);

    delete m_pOurOutput;
    delete m_pParentFilter;
    delete m_pSrcFilter;

    // FIXME - we are still leaving few things allocated!
    if (m_iHandle)
	FreeLibrary(m_iHandle);

}

DS_Filter::~DS_Filter()
{
    //cout << "Destruction of DS_FILTER" << endl;
    Stop();
    if (m_iState == 1)
	clean();
    //cout << "Destruction of DS_FILTER done" << endl;
}

void DS_Filter::Create(char*  dllname, const GUID* id, AM_MEDIA_TYPE* in_fmt, AM_MEDIA_TYPE* out_fmt)
{

    Setup_LDT_Keeper();

    try
    {
//	string _fullname=def_path;
//	_fullname+="/";
//	_fullname+=dllname;
	m_iHandle= expLoadLibraryA(dllname);
	if (!m_iHandle)
	{
	    char e[1024];
	    sprintf(e, "Could not open DirectShow DLL: %s", dllname);
	    throw FATAL(e);
	}
        GETCLASS func=(GETCLASS)GetProcAddress(m_iHandle, "DllGetClassObject");
	if (!func)
	{
	    char e[1024];
	    sprintf(e, "Illegal or corrupt DirectShow DLL: %s", dllname);
	    throw FATAL(e);
	}

	HRESULT result;
	IClassFactory* factory=0;
	result=func(id, &IID_IClassFactory, (void**)&factory);
	if(result || (!factory)) throw FATAL("No such class object");;

	setup_FS_Segment();

	IUnknown* object=0;
	result=factory->vt->CreateInstance(factory, 0, &IID_IUnknown, (void**)&object);
	factory->vt->Release((IUnknown*)factory);
	if(result || (!object)) throw FATAL("Class factory failure");

	result=object->vt->QueryInterface(object, &IID_IBaseFilter, (void**)&m_pFilter);
	object->vt->Release((IUnknown*)object);
	if(result || (!m_pFilter)) throw FATAL("Object does not have IBaseFilter interface");

	IEnumPins* enum_pins=0;
    //	enumerate pins
	result=m_pFilter->vt->EnumPins(m_pFilter, &enum_pins);
	if(result || (!enum_pins)) throw FATAL("Could not enumerate pins");
	IPin* array[256];
	ULONG fetched;
	enum_pins->vt->Reset(enum_pins);
	result=enum_pins->vt->Next(enum_pins, (ULONG)256, (IPin**)array, &fetched);
	Debug printf("Pins enumeration returned %ld pins, error is %x\n", fetched, (int)result);

	for (unsigned i = 0; i < fetched; i++)
	{
	    int direction = -1;
	    array[i]->vt->QueryDirection(array[i], (PIN_DIRECTION*)&direction);
	    if (!m_pInputPin && direction == 0)
	    {
		m_pInputPin = array[i];
		m_pInputPin->vt->AddRef((IUnknown*)m_pInputPin);
	    }
	    if (!m_pOutputPin && direction == 1)
	    {
		m_pOutputPin = array[i];
		m_pOutputPin->vt->AddRef((IUnknown*)m_pOutputPin);
	    }
	    array[i]->vt->Release((IUnknown*)(array[i]));
	}
	if (!m_pInputPin)
	    throw FATAL("Input pin not found");
	if (!m_pOutputPin)
	    throw FATAL("Output pin not found");

	result = m_pInputPin->vt->QueryInterface((IUnknown*)m_pInputPin,
						 &IID_IMemInputPin,
						 (void**)&m_pImp);
        if(result)
	    throw FATAL("Error getting IMemInputPin interface");
	m_pOurType=in_fmt;
	m_pDestType=out_fmt;
        result=m_pInputPin->vt->QueryAccept(m_pInputPin, m_pOurType);
	if (result)
	    throw FATAL("Source format is not accepted");

	m_pParentFilter=new CBaseFilter2;
        m_pSrcFilter=new CBaseFilter(*m_pOurType, m_pParentFilter);
	m_pOurInput=m_pSrcFilter->GetPin();
	m_pOurInput->vt->AddRef((IUnknown*)m_pOurInput);

	result=m_pInputPin->vt->ReceiveConnection(m_pInputPin, m_pOurInput,
						  m_pOurType);
	if (result)
	    throw FATAL("Error connecting to input pin");

	m_pOurOutput = new COutputPin(*m_pDestType);

	result = m_pOutputPin->vt->ReceiveConnection(m_pOutputPin,
						     m_pOurOutput,
						     m_pDestType);
	if (result)
	    throw FATAL("Error connecting to output pin");
	cout << "Using DirectShow codec: " << dllname << endl;
	m_iState = 1;
    }
    catch(FatalError e)
    {
	e.PrintAll();
        clean();
	throw;
    }
}

void DS_Filter::Start()
{
    if (m_iState != 1)
	return;

    HRESULT hr=m_pFilter->vt->Run(m_pFilter, 0);
    if (hr != 0)
    {
	Debug cerr<<"WARNING: m_Filter->Run() failed, error code "<<hex<<hr<<dec<<endl;
    }
    hr=m_pImp->vt->GetAllocator(m_pImp, &m_pAll);
    if (hr)
    {
        Debug cerr<<"Error getting IMemAllocator interface "<<hex<<hr<<dec<<endl;
        m_pImp->vt->Release((IUnknown*)m_pImp);
        return;
    }
    m_pImp->vt->NotifyAllocator(m_pImp, m_pAll,	0);
    m_iState = 2;
}

void DS_Filter::Stop()
{
    if (m_iState == 2)
    {
	m_pAll->vt->Release((IUnknown*)m_pAll);
	m_pAll=0;
	m_pFilter->vt->Stop(m_pFilter);
	m_iState=1;
    }
}