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

src/audio_device.h

@@ -0,0 +1,91 @@
+/*  audio_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 AUDIO_DEVICE_H
+#define AUDIO_DEVICE_H
+
+#define OPENAL_BUFS 5
+#define MAX_DEVICES 32
+#include <inttypes.h>
+#include "windows.h"
+
+typedef enum DeviceType {
+    input,
+    output,
+} DeviceType;
+
+typedef enum DeviceError {
+    de_None,
+    de_InternalError = -1,
+    de_InvalidSelection = -2,
+    de_FailedStart = -3,
+    de_Busy = -4,
+    de_AllDevicesBusy = -5,
+    de_DeviceNotActive = -6,
+    de_BufferError = -7,
+    de_UnsupportedMode = -8,
+    de_AlError = -9,
+} DeviceError;
+
+typedef void (*DataHandleCallback) (const int16_t*, uint32_t size, void* data);
+
+
+#ifdef AUDIO
+DeviceError init_devices(ToxAv* av);
+#else
+DeviceError init_devices();
+#endif /* AUDIO */
+
+DeviceError terminate_devices();
+
+/* Callback handles ready data from INPUT device */
+DeviceError register_device_callback(int32_t call_idx, uint32_t device_idx, DataHandleCallback callback, void* data, bool enable_VAD);
+void* get_device_callback_data(uint32_t device_idx);
+
+/* toggle device mute */
+DeviceError device_mute(DeviceType type, uint32_t device_idx);
+
+#ifdef AUDIO
+DeviceError device_set_VAD_treshold(uint32_t device_idx, float value);
+#endif
+
+DeviceError set_primary_device(DeviceType type, int32_t selection);
+DeviceError open_primary_device(DeviceType type, uint32_t* device_idx, uint32_t sample_rate, uint32_t frame_duration, uint8_t channels);
+/* Start device */
+DeviceError open_device(DeviceType type, int32_t selection, uint32_t* device_idx, uint32_t sample_rate, uint32_t frame_duration, uint8_t channels);
+/* Stop device */
+DeviceError close_device(DeviceType type, uint32_t device_idx);
+
+/* Write data to device */
+DeviceError write_out(uint32_t device_idx, const int16_t* data, uint32_t length, uint8_t channels);
+
+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 /* AUDIO_DEVICE_H */