Implemented OpenCV demo to demonstrate video device listing and set up code structure for video

cfg/checks/av.mk

@@ -1,10 +1,18 @@
 # Variables for audio call support
 AUDIO_LIBS = libtoxav openal
+VIDEO_LIBS = libtoxav opencv
 AUDIO_CFLAGS = -DAUDIO
-ifneq (, $(findstring device.o, $(OBJ)))
+VIDEO_CFLAGS = -DVIDEO
+ifneq (, $(findstring audio_device.o, $(OBJ)))
     AUDIO_OBJ = audio_call.o
 else
-    AUDIO_OBJ = audio_call.o device.o
+    AUDIO_OBJ = audio_call.o audio_device.o
+endif
+
+ifneq (, $(findstring video_device.o, $(OBJ)))
+	VIDEO_OBJ = video_call.o
+else
+	VIDEO_OBJ = video_call.o video_device.o
 endif
 
 # Check if we can build audio support
@@ -19,3 +27,16 @@ else ifneq ($(MAKECMDGOALS), clean)
     $(warning WARNING -- You need these libraries for audio support)
     $(warning WARNING -- $(MISSING_AUDIO_LIBS))
 endif
+
+# Check if we can build video support
+CHECK_VIDEO_LIBS = $(shell pkg-config --exists $VIDEO_LIBS) || echo -n "error")
+ifneq ($(CHECK_VIDEO_LIBS), error)
+    LIBS += $(VIDEO_LIBS)
+    CFLAGS += $(VIDEO_CFLAGS)
+    OBJ += $(VIDEO_OBJ)
+else ifneq ($(MAKECMDGOALS), clean)
+    MISSING_VIDEO_LIBS = $(shell for lib in $(VIDEO_LIBS) ; do if ! pkg-config --exists $$lib ; then echo $$lib ; fi ; done)
+    $(warning WARNING -- Toxic will be compiled without video support)
+    $(warning WARNING -- You need these libraries for video support)
+    $(warning WARNING -- $(MISSING_VIDEO_LIBS))
+endif

opencv_demo/Makefile

@@ -0,0 +1,7 @@
+CC=gcc
+
+capture_playback: capture_playback.c
+	$(CC) -o capture_playback capture_playback.c -lopencv_core -lopencv_highgui
+
+clean:
+	rm -f capture_playback *.o

opencv_demo/README.md

@@ -0,0 +1 @@
+gcc -o example.exe -I C:/opencv/build/include -L C:/opencv/build/x86/vc12/lib capture_playback.c -lopencv_core2411d -lopencv_highgui2411d -luuid -strmiids -lole32 -loleaut32

opencv_demo/capture_playback.c

@@ -0,0 +1,156 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <opencv2/core/core.hpp>
+#include <opencv2/highgui/highgui.hpp>
+
+#ifdef __linux__
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <linux/videodev2.h>
+#endif /* __linux __ */
+
+#ifdef __WIN32
+#include <windows.h>
+#include <dshow.h>
+
+#pragma comment(lib, "strmiids.lib")
+#endif /* __WIN32 */
+
+#define MAX_DEVICES 32
+
+int main(int argc, char *argv[])
+{
+    const char *device_names[MAX_DEVICES];
+    int amt_cameras = 0;
+    int i = 0;
+
+    #ifdef __linux__
+    // Enumerate video capture devices
+    while(i <= MAX_DEVICES)
+    {
+        int fd;
+        struct v4l2_capability video_cap;
+        char device_address[256];
+        snprintf(device_address, sizeof device_address, "/dev/video%d",i);
+
+        if((fd = open(device_address, O_RDONLY)) == -1) {
+            break;
+        }
+        else {
+            // Query capture device information
+            if(ioctl(fd, VIDIOC_QUERYCAP, &video_cap) == -1)
+                perror("cam_info: Can't get capabilities");
+            else {
+                //printf("Card:\t\t '%s'\n", video_cap.card);
+                int name_length = sizeof(video_cap.card);
+                char* name = (char*)malloc(name_length+1);
+                name = video_cap.card;
+                device_names[i] = name;
+            }
+            close(fd);
+            amt_cameras = i;
+        }
+        ++i;
+    }
+    #endif /* __linux__ */
+    
+    #ifdef __WIN32
+    HRESULT hr;
+    CoInitialize(NULL);
+    ICreateDevEnum *pSysDevEnum = NULL;
+    hr = CoCreateInstance(&CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER, &IID_ICreateDevEnum, (void**)&pSysDevEnum);
+    if(FAILED(hr)) {
+        printf("CoCreateInstance failed()\n");
+    }
+    // Obtain a class enumerator for the video compressor category.
+    IEnumMoniker *pEnumCat = NULL;
+    hr = pSysDevEnum->lpVtbl->CreateClassEnumerator(pSysDevEnum, &CLSID_VideoInputDeviceCategory, &pEnumCat, 0);
+    if(hr != S_OK) {
+        pSysDevEnum->lpVtbl->Release(pSysDevEnum);
+        printf("CreateClassEnumerator failed()\n");
+    }
+
+    IMoniker *pMoniker = NULL;
+
+    ULONG cFetched;
+    while(pEnumCat->lpVtbl->Next(pEnumCat, 1, &pMoniker, &cFetched) == S_OK && i <= MAX_DEVICES) {
+        IPropertyBag *pPropBag;
+        hr = pMoniker->lpVtbl->BindToStorage(pMoniker, 0, 0, &IID_IPropertyBag, (void **)&pPropBag);
+        if(SUCCEEDED(hr)) {
+            // To retrieve the filter's friendly name, do the following:
+            VARIANT varName;
+            VariantInit(&varName);
+            hr = pPropBag->lpVtbl->Read(pPropBag, L"FriendlyName", &varName, 0);
+            if (SUCCEEDED(hr)) {
+                if(varName.vt == VT_BSTR) {
+                    //printf("friendly name: %ls\n", varName.bstrVal);
+                    int name_length = wcslen(varName.bstrVal);
+                    char* name = (char*)malloc(name_length + 1);
+                    wcstombs(name, varName.bstrVal, name_length + 1);
+                    device_names[i] = name;
+                    //free(name);
+                } else {
+                    //printf("unfriendly name\n");
+                    device_names[i] = "Unknown Device";
+                }
+                ++i;
+            }
+            
+            VariantClear(&varName);
+            pPropBag->lpVtbl->Release(pPropBag);
+        }
+        pMoniker->lpVtbl->Release(pMoniker);
+    }
+    amt_cameras = i-1;
+    pEnumCat->lpVtbl->Release(pEnumCat);
+    pSysDevEnum->lpVtbl->Release(pSysDevEnum);
+    
+    #endif /* __WIN32 */
+
+    // TODO: Windows video capture enumeration
+
+    // Obtain user camera selection
+    int select_camera = -1;
+    while(select_camera < 0 || select_camera > amt_cameras || select_camera >= MAX_DEVICES) {
+        printf("Select a camera from %d cameras...\n", amt_cameras+1);
+        int i = 0;
+        // Print all collected devices
+        while(i <= amt_cameras)
+        {
+            printf("%d: %s\n", i, device_names[i]);
+            ++i;
+        }
+        printf("\nCamera #:");
+        scanf(" %d", &select_camera);
+    }
+    printf("\nPress spacebar to exit.\n\n");
+
+    // Initialize window
+    cvNamedWindow("Camera", 1);
+    // Initialize camera
+    CvCapture* capture = cvCreateCameraCapture(select_camera);
+    char key = 0;
+    // Run until spacebar is pressed
+    while(key != 32 && capture != NULL) {
+        // Obtains frame from camera and show it on window
+        IplImage* frame = cvQueryFrame(capture);
+        cvShowImage("Camera", frame);
+        key = cvWaitKey(10);
+    } 
+    
+    // Free device list allocations
+    i = 0;
+    while(i <= amt_cameras)
+    {
+        free(device_names[i]);
+        ++i;
+    }
+    
+    // Collapse camera and window
+    cvReleaseCapture(&capture);
+    cvDestroyWindow("Camera");
+
+    return 0;
+}

src/audio_call.c

@@ -23,7 +23,7 @@
 #include "toxic.h"
 #include "windows.h"
 #include "audio_call.h"
-#include "device.h"
+#include "audio_device.h"
 #include "chat_commands.h"
 #include "global_commands.h"
 #include "line_info.h"
@@ -69,7 +69,7 @@ static int set_call(Call* call, bool start)
     else {
         call->ttid = 0;
         if (pthread_mutex_destroy(&call->mutex) != 0)
-            return -1;
+               return -1;
     }
 
     return 0;

src/audio_call.h

@@ -25,7 +25,7 @@
 
 #include <tox/toxav.h>
 
-#include "device.h"
+#include "audio_device.h"
 
 typedef enum _AudioError {
     ae_None = 0,

src/audio_device.c

@@ -1,4 +1,4 @@
-/*  device.c
+/*  audio_device.c
  *
  *
  *  Copyright (C) 2014 Toxic All Rights Reserved.
@@ -20,7 +20,7 @@
  *
  */
 
-#include "device.h"
+#include "audio_device.h"
 
 #ifdef AUDIO
 #include "audio_call.h"

src/audio_device.h

@@ -1,4 +1,4 @@
-/*  device.h
+/*  audio_device.h
  *
  *
  *  Copyright (C) 2014 Toxic All Rights Reserved.
@@ -26,8 +26,8 @@
  * Read from running input device(s) via select()/callback combo.
  */
 
-#ifndef DEVICE_H
+#ifndef AUDIO_DEVICE_H
-#define DEVICE_H
+#define AUDIO_DEVICE_H
 
 #define OPENAL_BUFS 5
 #define MAX_DEVICES 32
@@ -88,4 +88,4 @@ void print_devices(ToxWindow* self, DeviceType type);
 void get_primary_device_name(DeviceType type, char *buf, int size);
 
 DeviceError selection_valid(DeviceType type, int32_t selection);
-#endif /* DEVICE_H */
+#endif /* AUDIO_DEVICE_H */

src/chat.c

@@ -101,6 +101,12 @@ static const char chat_cmd_list[AC_NUM_CHAT_COMMANDS][MAX_CMDNAME_SIZE] = {
     { "/mute"       },
     { "/sense"      },
 
+#ifdef VIDEO
+
+    { "/enablevid"      },
+    { "/disablevid"     },
+
+#endif /* VIDEO */
 #endif /* AUDIO */
 };
 

src/chat_commands.h

@@ -41,6 +41,10 @@ void cmd_cancel(WINDOW *, ToxWindow *, Tox *, int argc, char (*argv)[MAX_STR_SIZ
 void cmd_ccur_device(WINDOW *, ToxWindow *, Tox *, int argc, char (*argv)[MAX_STR_SIZE]);
 void cmd_mute(WINDOW *, ToxWindow *, Tox *, int argc, char (*argv)[MAX_STR_SIZE]);
 void cmd_sense(WINDOW *, ToxWindow *, Tox *, int argc, char (*argv)[MAX_STR_SIZE]);
+#ifdef VIDEO
+void cmd_enablevid(WINDOW *, ToxWindow *, Tox *, int argc, char (*argv)[MAX_STR_SIZE]);
+void cmd_disablevid(WINDOW *, ToxWindow *, Tox *, int argc, char (*argv)[MAX_STR_SIZE]);
+#endif /* VIDEO */
 #endif /* AUDIO */
 
 #endif /* #define CHAT_COMMANDS_H */

src/execute.c

@@ -77,6 +77,10 @@ static struct cmd_func chat_commands[] = {
     { "/hangup",    cmd_hangup      },
     { "/mute",      cmd_mute        },
     { "/sense",     cmd_sense       },
+#ifdef VIDEO
+    { "/enablevid", cmd_enablevid   },
+    { "/disablevid",cmd_disablevid  },
+#endif /* VIDEO */
 #endif /* AUDIO */
     { NULL,         NULL            },
 };

src/groupchat.c

@@ -59,7 +59,7 @@
 #include "help.h"
 #include "notify.h"
 #include "autocomplete.h"
-#include "device.h"
+#include "audio_device.h"
 
 extern char *DATA_FILE;
 

src/notify.c

@@ -31,7 +31,7 @@
 #include <sys/stat.h>
 
 #include "notify.h"
-#include "device.h"
+#include "audio_device.h"
 #include "settings.h"
 #include "line_info.h"
 #include "misc_tools.h"

src/settings.c

@@ -32,7 +32,7 @@
 #include "misc_tools.h"
 
 #ifdef AUDIO
-    #include "device.h"
+    #include "audio_device.h"
 #endif /* AUDIO */
 
 #include "settings.h"

src/toxic.c

@@ -54,7 +54,8 @@
 #include "settings.h"
 #include "log.h"
 #include "notify.h"
-#include "device.h"
+#include "audio_device.h"
+#include "video_device.h"
 #include "message_queue.h"
 #include "execute.h"
 #include "term_mplex.h"
@@ -65,6 +66,9 @@
 
 #ifdef AUDIO
 #include "audio_call.h"
+#ifdef VIDEO
+#include "video_call.h"
+#endif /* VIDEO */
 ToxAv *av;
 #endif /* AUDIO */
 
@@ -131,6 +135,10 @@ void exit_toxic_success(Tox *m)
     terminate_audio();
 #endif /* AUDIO */
 
+#ifdef VIDEO
+    terminate_video();
+#endif /* VIDEO */
+
     free(DATA_FILE);
     free(BLOCK_FILE);
     free(user_settings);
@@ -1131,6 +1139,11 @@ int main(int argc, char *argv[])
 #ifdef AUDIO
 
     av = init_audio(prompt, m);
+    
+#ifdef VIDEO
+    av = init_video(prompt, m, av);
+
+#endif /* VIDEO*/
 
     /* audio thread */
     if (pthread_create(&audio_thread.tid, NULL, thread_audio, (void *) av) != 0)

src/video_call.c

@@ -0,0 +1,119 @@
+/*  video_call.c
+ *
+ *
+ *  Copyright (C) 2014 Toxic All Rights Reserved.
+ *
+ *  This file is part of Toxic.
+ *
+ *  Toxic is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Toxic is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Toxic.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "toxic.h"
+#include "windows.h"
+#include "video_call.h"
+#include "video_device.h"
+#include "chat_commands.h"
+#include "global_commands.h"
+#include "line_info.h"
+#include "notify.h"
+
+#include <stdbool.h>
+#include <curses.h>
+#include <string.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#define cbend pthread_exit(NULL)
+
+#define MAX_CALLS 10
+
+struct VSettings {
+    VideoError errors;
+
+    ToxAv *av;
+
+    ToxAvCSettings cs;
+
+    Call calls[MAX_CALLS];
+} VSettins;
+
+ToxAv *init_video(ToxWindow *self, Tox *tox, ToxAv *av)
+{
+    VSettins.cs = av_DefaultSettings;
+    VSettins.cs.max_video_height = 1024;
+    VSettins.cs.max_video_width = 1024;
+
+    VSettins.errors = ve_None;
+
+    VSettins.av = av;
+
+    memset(VSettins.calls, 0, sizeof(VSettins.calls));
+
+    if( !VSettins.av ) {
+        //line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, 0, "New toxav instance");
+        VSettins.av = toxav_new(tox, MAX_CALLS);
+    }
+
+    if ( !VSettins.av ) {
+        VSettins.errors |= ve_StartingCoreVideo;
+        return NULL;
+    }
+
+    if ( init_video_devices(VSettins.av) == vde_InternalError ) {
+        line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, 0, "Failed to init video devices");
+        //toxav_kill(VSettins.av);
+        return VSettins.av = NULL;
+    }
+
+    return VSettins.av;	
+}
+
+void terminate_video()
+{
+    int i;
+    for (i = 0; i < MAX_CALLS; ++i)
+        stop_video_transmission(&VSettins.calls[i], i);
+
+    terminate_video_devices();
+}
+
+int start_video_transmission(ToxWindow *self, Call *call)
+{
+
+    return 0;
+}
+
+int stop_video_transmission(Call *call, int call_index)
+{
+
+    return 0;
+}
+
+/*
+ * Commands from chat_commands.h
+ */
+void cmd_enablevid(WINDOW *window, ToxWindow *self, Tox *m, int argc, char (*argv)[MAX_STR_SIZE])
+{
+    line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, 0, "Video Enabled");
+    return;
+}
+
+void cmd_disablevid(WINDOW *window, ToxWindow *self, Tox *m, int argc, char (*argv)[MAX_STR_SIZE])
+{
+    line_info_add(self, NULL, NULL, NULL, SYS_MSG, 0, 0, "Video Disabled");
+    return;
+}

src/video_call.h

@@ -0,0 +1,45 @@
+/*  video_call.h
+ *
+ *
+ *  Copyright (C) 2014 Toxic All Rights Reserved.
+ *
+ *  This file is part of Toxic.
+ *
+ *  Toxic is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Toxic is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Toxic.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef VIDEO_H
+#define VIDEO_H
+
+#include <tox/toxav.h>
+
+#include "audio_call.h"
+#include "video_device.h"
+
+typedef enum _VideoError {
+    ve_None = 0,
+    ve_StartingCaptureDevice = 1 << 0,
+    ve_StartingOutputDevice = 1 << 1,
+    ve_StartingCoreVideo = 1 << 2
+} VideoError;
+
+/* You will have to pass pointer to first member of 'windows' declared in windows.c */
+ToxAv *init_video(ToxWindow *self, Tox *tox, ToxAv *av);
+void terminate_video();
+int start_video_transmission(ToxWindow *self, Call *call);
+int stop_video_transmission(Call *call, int call_index);
+void stop_current_video_call(ToxWindow *self);
+
+ #endif /* VIDEO_H */

src/video_device.c

@@ -0,0 +1,326 @@
+/*  video_device.c
+ *
+ *
+ *  Copyright (C) 2014 Toxic All Rights Reserved.
+ *
+ *  This file is part of Toxic.
+ *
+ *  Toxic is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Toxic is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Toxic.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "video_device.h"
+
+#ifdef VIDEO
+#include "video_call.h"
+#endif
+
+#include "line_info.h"
+#include "settings.h"
+
+#include <opencv2/core/core.hpp>
+#include <opencv2/highgui/highgui.hpp>
+#include <vpx/vpx_image.h>
+
+#ifdef __linux__
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/ioctl.h>
+#include <linux/videodev2.h>
+#endif /* __linux __ */
+
+#ifdef __WIN32
+#include <windows.h>
+#include <dshow.h>
+
+#pragma comment(lib, "strmiids.lib")
+#endif /* __WIN32 */
+
+#include <stdbool.h>
+#include <string.h>
+#include <pthread.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#define inline__ inline __attribute__((always_inline))
+
+extern struct user_settings *user_settings;
+
+ typedef struct VideoDevice {
+    CvCapture* dhndl;
+    char* window;
+    IplImage* frame;
+    int32_t call_idx;
+
+    uint32_t ref_count;
+    int32_t selection;
+    pthread_mutex_t mutex[1];
+    uint16_t frame_width;
+    uint16_t frame_height;
+ } VideoDevice;
+
+const char *default_video_device_names[2];
+const char *video_device_names[2][MAX_DEVICES];
+static int video_device_size[2];
+VideoDevice *video_device_running[2][MAX_DEVICES] = {{NULL}};
+uint32_t primary_video_device[2];
+
+#ifdef VIDEO
+static ToxAv* av = NULL;
+#endif /* VIDEO */
+
+pthread_mutex_t video_mutex;
+
+bool video_thread_running = true,
+      video_thread_paused =  true;
+
+void* video_thread_poll(void*);
+/* Meet devices */
+#ifdef VIDEO
+VideoDeviceError init_video_devices(ToxAv* av_)
+#else
+VideoDeviceError init_video_devices()
+#endif /* AUDIO */
+{
+    video_device_size[input] = 0;
+    uint32_t i;
+#ifdef __linux__
+    /* Enumerate video capture devices using v4l */
+    for(i = 0; i <= MAX_DEVICES; ++i)
+    {
+        int fd;
+        struct v4l2_capability video_cap;
+        char device_address[256];
+        snprintf(device_address, sizeof device_address, "/dev/video%d",i);
+
+        if((fd = open(device_address, O_RDONLY)) == -1) {
+            break;
+        }
+        else {
+            // Query capture device information
+            if(ioctl(fd, VIDIOC_QUERYCAP, &video_cap) == -1)
+                perror("cam_info: Can't get capabilities");
+            else {
+                int name_length = sizeof(video_cap.card);
+                char* name = (char*)malloc(name_length+1);
+                name = video_cap.card;
+                video_device_names[input][i] = name;
+            }
+            close(fd);
+            video_device_size[input] = i;
+        }
+    }
+#endif /* __linux__ */
+    
+#ifdef __WIN32
+    /* Enumerate video capture devices using win32 api */
+
+    HRESULT hr;
+    CoInitialize(NULL);
+    ICreateDevEnum *pSysDevEnum = NULL;
+    hr = CoCreateInstance(&CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC_SERVER, &IID_ICreateDevEnum, (void**)&pSysDevEnum);
+    if(FAILED(hr)) {
+        printf("CoCreateInstance failed()\n");
+    }
+    // Obtain a class enumerator for the video compressor category.
+    IEnumMoniker *pEnumCat = NULL;
+    hr = pSysDevEnum->lpVtbl->CreateClassEnumerator(pSysDevEnum, &CLSID_VideoInputDeviceCategory, &pEnumCat, 0);
+    if(hr != S_OK) {
+        pSysDevEnum->lpVtbl->Release(pSysDevEnum);
+        printf("CreateClassEnumerator failed()\n");
+    }
+
+    IMoniker *pMoniker = NULL;
+
+    ULONG cFetched;
+    i = 0;
+    while( pEnumCat->lpVtbl->Next(pEnumCat, 1, &pMoniker, &cFetched) == S_OK && i <= MAX_DEVICES ) {
+        IPropertyBag *pPropBag;
+        hr = pMoniker->lpVtbl->BindToStorage(pMoniker, 0, 0, &IID_IPropertyBag, (void **)&pPropBag);
+        if(SUCCEEDED(hr)) {
+            /* To retrieve the filter's friendly name, do the following: */
+            VARIANT varName;
+            VariantInit(&varName);
+            hr = pPropBag->lpVtbl->Read(pPropBag, L"FriendlyName", &varName, 0);
+            if (SUCCEEDED(hr)) {
+                if(varName.vt == VT_BSTR) {
+                    int name_length = wcslen(varName.bstrVal);
+                    char* name = (char*)malloc(name_length + 1);
+                    wcstombs(name, varName.bstrVal, name_length + 1);
+                    video_device_names[input][i] = name;
+                } else {
+                    video_device_names[input][i] = "Unknown Device";
+                }
+                ++i;
+            }
+            
+            VariantClear(&varName);
+            pPropBag->lpVtbl->Release(pPropBag);
+        }
+        pMoniker->lpVtbl->Release(pMoniker);
+    }
+    video_device_size[input] = i-1;
+    pEnumCat->lpVtbl->Release(pEnumCat);
+    pSysDevEnum->lpVtbl->Release(pSysDevEnum);
+#endif /* __WIN32 */
+
+    /* Start poll thread */
+    if (pthread_mutex_init(&video_mutex, NULL) != 0)
+        return vde_InternalError;
+    
+    pthread_t thread_id;
+    if ( pthread_create(&thread_id, NULL, video_thread_poll, NULL) != 0 || pthread_detach(thread_id) != 0) 
+        return vde_InternalError;    
+
+#ifdef VIDEO
+    av = av_;
+#endif /* VIDEO */
+
+    return (VideoDeviceError) vde_None;
+}
+
+VideoDeviceError terminate_video_devices()
+{
+    /* Cleanup if needed */
+    video_thread_running = false;
+    usleep(20000);
+    
+    if (pthread_mutex_destroy(&video_mutex) != 0)
+        return (VideoDeviceError) vde_InternalError;
+    
+    return (VideoDeviceError) vde_None;    
+}
+
+void* video_thread_poll(void* arg)
+{
+    (void)arg;
+    uint32_t i;
+
+    while(video_thread_running)
+    {
+        if (video_thread_paused) usleep(10000); /* Wait for unpause. */
+        else
+        {
+            for (i = 0; i < video_device_size[input]; ++i)
+            {
+                pthread_mutex_lock(&video_mutex);
+
+                if (video_device_running[input][i] != NULL)
+                {
+                    /* Capture video frame data of input device */
+                    video_device_running[input][i]->frame = cvQueryFrame(video_device_running[input][i]->dhndl);
+                }
+
+                pthread_mutex_unlock(&video_mutex);
+            }
+            usleep(5000);
+        }
+    }
+
+    pthread_exit(NULL);
+}
+
+
+VideoDeviceError set_primary_video_device(DeviceType type, int32_t selection)
+{
+    if (video_device_size[type] <= selection || selection < 0) return (VideoDeviceError) vde_InvalidSelection;
+    primary_video_device[type] = selection;
+    
+    return (VideoDeviceError) vde_None;
+}
+
+VideoDeviceError open_video_device(DeviceType type, int32_t selection, uint32_t* device_idx)
+{
+    if (video_device_size[type] <= selection || selection < 0) return vde_InvalidSelection;
+
+    pthread_mutex_lock(&video_mutex);
+    uint32_t i;
+    for (i = 0; i < MAX_DEVICES; ++i) { /* Check if any device has the same selection */
+        if ( video_device_running[type][i] && video_device_running[type][i]->selection == selection ) {
+
+            video_device_running[type][*device_idx] = video_device_running[type][i];
+            video_device_running[type][i]->ref_count++;
+
+            pthread_mutex_unlock(&video_mutex);
+            return vde_None;
+        }
+    }
+
+    VideoDevice* device = video_device_running[type][*device_idx] = calloc(1, sizeof(VideoDevice));
+    device->selection = selection;
+
+    if (pthread_mutex_init(device->mutex, NULL) != 0) {
+        free(device);
+        pthread_mutex_unlock(&video_mutex);
+        return vde_InternalError;
+    }
+
+    if (type  == input) {
+        device->window = video_device_names[input][selection];
+        cvNamedWindow(device->window, 1);
+        device->dhndl = cvCreateCameraCapture(selection);
+    }
+    else {
+        device->dhndl = NULL;
+        device->window = video_device_names[output][selection];
+        if ( device->dhndl || !device->window ) {
+            free(device);
+            video_device_running[type][*device_idx] = NULL;
+            pthread_mutex_unlock(&video_mutex);
+            return vde_FailedStart;
+        }
+
+        cvNamedWindow(device->window,1);
+    }
+
+    if (type == input) {
+        video_thread_paused = false;
+    }
+
+    pthread_mutex_unlock(&video_mutex);
+    return vde_None;
+}
+
+VideoDeviceError close_video_device(DeviceType type, uint32_t device_idx)
+{
+    if (device_idx >= MAX_DEVICES) return vde_InvalidSelection;
+
+    pthread_mutex_lock(&video_mutex);
+    VideoDevice* device = video_device_running[type][device_idx];
+    VideoDeviceError rc = de_None;
+
+    if (!device) {
+        pthread_mutex_unlock(&video_mutex);
+        return vde_DeviceNotActive;
+    }
+
+    video_device_running[type][device_idx] = NULL;
+
+    if ( !device->ref_count ) {
+        if (type == input) {
+            cvReleaseCapture(&device->dhndl);
+            cvDestroyWindow(device->window);
+        }
+        else {
+            cvDestroyWindow(device->window);
+        }
+
+        free(device);
+    }
+    else device->ref_count--;
+
+    pthread_mutex_unlock(&video_mutex);
+    return rc;
+}

src/video_device.h

@@ -0,0 +1,66 @@
+/*  video_device.h
+ *
+ *
+ *  Copyright (C) 2014 Toxic All Rights Reserved.
+ *
+ *  This file is part of Toxic.
+ *
+ *  Toxic is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Toxic is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Toxic.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/*
+ * You can have multiple sources (Input devices) but only one output device.
+ * Pass buffers to output device via write(); 
+ * Read from running input device(s) via select()/callback combo.
+ */
+
+#ifndef VIDEO_DEVICE_H
+#define VIDEO_DEVICE_H
+
+#define MAX_DEVICES 32
+#include <inttypes.h>
+#include "windows.h"
+
+#include "audio_device.h"
+
+typedef enum VideoDeviceError {
+    vde_None,
+    vde_InternalError = -1,
+    vde_InvalidSelection = -2,
+    vde_FailedStart = -3,
+    vde_Busy = -4,
+    vde_AllDevicesBusy = -5,
+    vde_DeviceNotActive = -6,
+    vde_BufferError = -7,
+    vde_UnsupportedMode = -8,
+    vde_OpenCVError = -9,
+} VideoDeviceError;
+
+#ifdef VIDEO
+VideoDeviceError init_video_devices(ToxAv* av);
+#else
+VideoDeviceError init_video_devices();
+#endif /* VIDEO */
+
+VideoDeviceError terminate_video_devices();
+
+VideoDeviceError set_primary_video_device(DeviceType type, int32_t selection);
+VideoDeviceError open_primary_video_device(DeviceType type);
+/* Start device */
+VideoDeviceError open_video_device(DeviceType type, int32_t selection, uint32_t* device_idx);
+/* Stop device */
+VideoDeviceError close_video_device(DeviceType type, uint32_t device_idx);
+
+#endif /* VIDEO_DEVICE_H */