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      1 /*
      2  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 #include <initguid.h>  // Must come before the help_functions_ds.h include so
     12                        // that DEFINE_GUID() entries will be defined in this
     13                        // object file.
     14 
     15 #include "webrtc/modules/video_capture/windows/help_functions_ds.h"
     16 
     17 #include <cguid.h>
     18 
     19 namespace webrtc
     20 {
     21 namespace videocapturemodule
     22 {
     23 // This returns minimum :), which will give max frame rate...
     24 LONGLONG GetMaxOfFrameArray(LONGLONG *maxFps, long size)
     25 {
     26     LONGLONG maxFPS = maxFps[0];
     27     for (int i = 0; i < size; i++)
     28     {
     29         if (maxFPS > maxFps[i])
     30             maxFPS = maxFps[i];
     31     }
     32     return maxFPS;
     33 }
     34 
     35 IPin* GetInputPin(IBaseFilter* filter)
     36 {
     37     HRESULT hr;
     38     IPin* pin = NULL;
     39     IEnumPins* pPinEnum = NULL;
     40     filter->EnumPins(&pPinEnum);
     41     if (pPinEnum == NULL)
     42     {
     43         return NULL;
     44     }
     45 
     46     // get first unconnected pin
     47     hr = pPinEnum->Reset(); // set to first pin
     48 
     49     while (S_OK == pPinEnum->Next(1, &pin, NULL))
     50     {
     51         PIN_DIRECTION pPinDir;
     52         pin->QueryDirection(&pPinDir);
     53         if (PINDIR_INPUT == pPinDir) // This is an input pin
     54         {
     55             IPin* tempPin = NULL;
     56             if (S_OK != pin->ConnectedTo(&tempPin)) // The pint is not connected
     57             {
     58                 pPinEnum->Release();
     59                 return pin;
     60             }
     61         }
     62         pin->Release();
     63     }
     64     pPinEnum->Release();
     65     return NULL;
     66 }
     67 
     68 IPin* GetOutputPin(IBaseFilter* filter, REFGUID Category)
     69 {
     70     HRESULT hr;
     71     IPin* pin = NULL;
     72     IEnumPins* pPinEnum = NULL;
     73     filter->EnumPins(&pPinEnum);
     74     if (pPinEnum == NULL)
     75     {
     76         return NULL;
     77     }
     78     // get first unconnected pin
     79     hr = pPinEnum->Reset(); // set to first pin
     80     while (S_OK == pPinEnum->Next(1, &pin, NULL))
     81     {
     82         PIN_DIRECTION pPinDir;
     83         pin->QueryDirection(&pPinDir);
     84         if (PINDIR_OUTPUT == pPinDir) // This is an output pin
     85         {
     86             if (Category == GUID_NULL || PinMatchesCategory(pin, Category))
     87             {
     88                 pPinEnum->Release();
     89                 return pin;
     90             }
     91         }
     92         pin->Release();
     93         pin = NULL;
     94     }
     95     pPinEnum->Release();
     96     return NULL;
     97 }
     98 
     99 BOOL PinMatchesCategory(IPin *pPin, REFGUID Category)
    100 {
    101     BOOL bFound = FALSE;
    102     IKsPropertySet *pKs = NULL;
    103     HRESULT hr = pPin->QueryInterface(IID_PPV_ARGS(&pKs));
    104     if (SUCCEEDED(hr))
    105     {
    106         GUID PinCategory;
    107         DWORD cbReturned;
    108         hr = pKs->Get(AMPROPSETID_Pin, AMPROPERTY_PIN_CATEGORY, NULL, 0, &PinCategory,
    109                       sizeof(GUID), &cbReturned);
    110         if (SUCCEEDED(hr) && (cbReturned == sizeof(GUID)))
    111         {
    112             bFound = (PinCategory == Category);
    113         }
    114         pKs->Release();
    115     }
    116     return bFound;
    117 }
    118 }  // namespace videocapturemodule
    119 }  // namespace webrtc
    120