mpv/loader/dshow/DS_Filter.c

#include "DS_Filter.h"
//#include "../loader/loader.h"
#include <libwin32.h>
#include <string>
#include <stdio.h>
#include <string.h>

#define __MODULE__ "DirectShow generic filter"

using namespace std;

extern "C" int STDCALL expLoadLibraryA(const char*);

typedef long STDCALL (*GETCLASS) (const GUID*, const GUID*, void**);

//extern "C" int STDCALL LoadLibraryA(const char*);
//extern "C" STDCALL void* GetProcAddress(int, const char*); // STDCALL has to be first NetBSD
//extern "C" int STDCALL FreeLibrary(int);

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;
}

DS_Filter::~DS_Filter()
{
    //cout << "Destruction of DS_FILTER" << endl;
    Stop();
    destroy();
    //cout << "Destruction of DS_FILTER done" << endl;
}

void DS_Filter::destroy()
{
    if (m_iState == 0)
	return;
    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);
}

void DS_Filter::Create(const char* dllname, const GUID* id,
		       AM_MEDIA_TYPE* in_fmt,
		       AM_MEDIA_TYPE* out_fmt)
{
    try
    {
	m_iHandle = expLoadLibraryA(dllname);
	if (!m_iHandle)
	{
	    char e[256];
	    printf("Could not open DirectShow DLL: %.200s", dllname);
	    throw FATAL(e);
	}
        GETCLASS func = (GETCLASS)GetProcAddress(m_iHandle, "DllGetClassObject");
	if (!func)
	{
	    char e[256];
	    printf("Illegal or corrupt DirectShow DLL: %.200s", 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");;

	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);

	//extern void trapbug();
	//trapbug();
	result = m_pOutputPin->vt->ReceiveConnection(m_pOutputPin,
						     m_pOurOutput,
						     m_pDestType);
	if (result)
	{
	    //printf("Tracking ACELP %d  0%x\n", result);
	    throw FATAL("Error connecting to output pin");
	}

	printf("Using DirectShow codec: %s\n", dllname);
	m_iState = 1;
    }
    catch (FatalError e)
    {
	//e.PrintAll();
	destroy();
	throw;
    }
}

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

    HRESULT hr=m_pFilter->vt->Run(m_pFilter, 0);
    if (hr != 0)
    {
	Debug printf("WARNING: m_Filter->Run() failed, error code %x\n", (int)hr);
    }
    hr = m_pImp->vt->GetAllocator(m_pImp, &m_pAll);
    if (hr)
    {
	Debug printf("Error getting IMemAllocator interface %x\n", (int)hr);
        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_pFilter->vt->Stop(m_pFilter); // causes weird crash ??? FIXME
	m_pAll = 0;
	m_iState = 1;
    }
}