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+%{
+/* toxav.h
+ * 
+ * Copyright (C) 2013-2015 Tox project All Rights Reserved.
+ *
+ * This file is part of Tox.
+ *
+ * Tox 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.
+ *
+ * Tox 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 Tox. If not, see <http://www.gnu.org/licenses/>.
+ * 
+ */
+
+#ifndef TOXAV_H
+#define TOXAV_H
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+%}
+
+/** \page av Public audio/video API for Tox clients.
+ * 
+ * This API can handle multiple calls. Each call has its state, in very rare
+ * occasions the library can change the state of the call without apps knowledge.
+ * 
+ */
+
+/** \subsection events Events and callbacks
+ *
+ * As in Core API, events are handled by callbacks. One callback can be 
+ * registered per event. All events have a callback function type named 
+ * `toxav_{event}_cb` and a function to register it named `tox_callback_{event}`. 
+ * Passing a NULL callback will result in no callback being registered for that 
+ * event. Only one callback per event can be registered, so if a client needs 
+ * multiple event listeners, it needs to implement the dispatch functionality 
+ * itself. Unlike Core API, lack of some event handlers will cause the the 
+ * library to drop calls before they are started. Hanging up call from a 
+ * callback causes undefined behaviour.
+ * 
+ */
+
+/** \subsection threading Threading implications
+ *
+ * Unlike the Core API, this API is fully thread-safe. The library will ensure
+ * the proper synchronisation of parallel calls. 
+ * 
+ * A common way to run ToxAV (multiple or single instance) is to have a thread,
+ * separate from tox instance thread, running a simple ${toxAV.iterate} loop, 
+ * sleeping for ${toxAV.iteration_interval} * milliseconds on each iteration.
+ *
+ */
+
+/**
+ * External Tox type.
+ */
+class tox {
+  struct this;
+}
+
+/**
+ * ToxAV.
+ */
+class toxAV {
+
+/**
+ * The ToxAV instance type. Each ToxAV instance can be bound to only one Tox
+ * instance, and Tox instance can have only one ToxAV instance. One must make
+ * sure to close ToxAV instance prior closing Tox instance otherwise undefined
+ * behaviour occurs. Upon closing of ToxAV instance, all active calls will be 
+ * forcibly terminated without notifying peers.
+ * 
+ */
+struct this;
+/*******************************************************************************
+ *
+ * :: API version
+ *
+ ******************************************************************************/
+/**
+ * The major version number. Incremented when the API or ABI changes in an
+ * incompatible way.
+ */
+#define TOXAV_VERSION_MAJOR               0u
+/**
+ * The minor version number. Incremented when functionality is added without
+ * breaking the API or ABI. Set to 0 when the major version number is
+ * incremented.
+ */
+#define TOXAV_VERSION_MINOR               0u
+/**
+ * The patch or revision number. Incremented when bugfixes are applied without
+ * changing any functionality or API or ABI.
+ */
+#define TOXAV_VERSION_PATCH               0u
+
+/**
+ * A macro to check at preprocessing time whether the client code is compatible
+ * with the installed version of ToxAV.
+ */
+#define TOXAV_VERSION_IS_API_COMPATIBLE(MAJOR, MINOR, PATCH)        \
+  (TOXAV_VERSION_MAJOR == MAJOR &&                                \
+   (TOXAV_VERSION_MINOR > MINOR ||                                \
+    (TOXAV_VERSION_MINOR == MINOR &&                              \
+     TOXAV_VERSION_PATCH >= PATCH)))
+
+/**
+ * A macro to make compilation fail if the client code is not compatible with
+ * the installed version of ToxAV.
+ */
+#define TOXAV_VERSION_REQUIRE(MAJOR, MINOR, PATCH)                \
+  typedef char toxav_required_version[TOXAV_IS_COMPATIBLE(MAJOR, MINOR, PATCH) ? 1 : -1]
+
+/**
+ * A convenience macro to call ${version.is_compatible} with the currently
+ * compiling API version.
+ */
+#define TOXAV_VERSION_IS_ABI_COMPATIBLE()                         \
+  toxav_version_is_compatible(TOXAV_VERSION_MAJOR, TOXAV_VERSION_MINOR, TOXAV_VERSION_PATCH)
+
+
+static namespace version {
+
+  /**
+   * Return the major version number of the library. Can be used to display the
+   * ToxAV library version or to check whether the client is compatible with the
+   * dynamically linked version of ToxAV.
+   */
+  uint32_t major();
+
+  /**
+   * Return the minor version number of the library.
+   */
+  uint32_t minor();
+
+  /**
+   * Return the patch number of the library.
+   */
+  uint32_t patch();
+
+  /**
+   * Return whether the compiled library version is compatible with the passed
+   * version numbers.
+   */
+  bool is_compatible(uint32_t major, uint32_t minor, uint32_t patch);
+
+}
+/*******************************************************************************
+ * 
+ * :: Creation and destruction
+ *
+ ******************************************************************************/
+/**
+ * Start new A/V session. There can only be only one session per Tox instance.
+ */
+static this new (tox::this *tox) {
+  NULL,
+  /**
+   * Memory allocation failure while trying to allocate structures required for
+   * the A/V session.
+   */
+  MALLOC,
+  /**
+   * Attempted to create a second session for the same Tox instance.
+   */
+  MULTIPLE,
+}
+/**
+ * Releases all resources associated with the A/V session.
+ *
+ * If any calls were ongoing, these will be forcibly terminated without
+ * notifying peers. After calling this function, no other functions may be
+ * called and the av pointer becomes invalid.
+ */
+void kill();
+/**
+ * Returns the Tox instance the A/V object was created for.
+ */
+tox::this *tox { get(); }
+/*******************************************************************************
+ * 
+ * :: A/V event loop
+ *
+ ******************************************************************************/
+/**
+ * Returns the interval in milliseconds when the next toxav_iterate call should
+ * be. If no call is active at the moment, this function returns 200.
+ */
+const uint32_t iteration_interval();
+/**
+ * Main loop for the session. This function needs to be called in intervals of
+ * toxav_iteration_interval() milliseconds. It is best called in the separate 
+ * thread from tox_iterate.
+ */
+void iterate();
+/*******************************************************************************
+ * 
+ * :: Call setup
+ *
+ ******************************************************************************/
+/**
+ * Call a friend. This will start ringing the friend.
+ *
+ * It is the client's responsibility to stop ringing after a certain timeout,
+ * if such behaviour is desired. If the client does not stop ringing, the
+ * library will not stop until the friend is disconnected.
+ *
+ * @param friend_number The friend number of the friend that should be called.
+ * @param audio_bit_rate Audio bit rate in Kb/sec. Set this to 0 to disable
+ * audio sending.
+ * @param video_bit_rate Video bit rate in Kb/sec. Set this to 0 to disable
+ * video sending.
+ */
+bool call(uint32_t friend_number, uint32_t audio_bit_rate, uint32_t video_bit_rate) {
+  /**
+   * A resource allocation error occurred while trying to create the structures
+   * required for the call.
+   */
+  MALLOC,
+  /**
+   * The friend number did not designate a valid friend.
+   */
+  FRIEND_NOT_FOUND,
+  /**
+   * The friend was valid, but not currently connected.
+   */
+  FRIEND_NOT_CONNECTED,
+  /**
+   * Attempted to call a friend while already in an audio or video call with
+   * them.
+   */
+  FRIEND_ALREADY_IN_CALL,
+  /**
+   * Audio or video bit rate is invalid.
+   */
+  INVALID_BIT_RATE,
+}
+event call {
+  /**
+   * The function type for the ${event call} callback.
+   * 
+   * @param friend_number The friend number from which the call is incoming.
+   * @param audio_enabled True if friend is sending audio.
+   * @param video_enabled True if friend is sending video.
+   */
+  typedef void(uint32_t friend_number, bool audio_enabled, bool video_enabled);
+}
+/**
+ * Accept an incoming call.
+ *
+ * If answering fails for any reason, the call will still be pending and it is
+ * possible to try and answer it later.
+ *
+ * @param friend_number The friend number of the friend that is calling.
+ * @param audio_bit_rate Audio bit rate in Kb/sec. Set this to 0 to disable
+ * audio sending.
+ * @param video_bit_rate Video bit rate in Kb/sec. Set this to 0 to disable
+ * video sending.
+ */
+bool answer(uint32_t friend_number, uint32_t audio_bit_rate, uint32_t video_bit_rate) {
+  /**
+   * Failed to initialize codecs for call session. Note that codec initiation
+   * will fail if there is no receive callback registered for either audio or
+   * video.
+   */
+  CODEC_INITIALIZATION,
+  /**
+   * The friend number did not designate a valid friend.
+   */
+  FRIEND_NOT_FOUND,
+  /**
+   * The friend was valid, but they are not currently trying to initiate a call.
+   * This is also returned if this client is already in a call with the friend.
+   */
+  FRIEND_NOT_CALLING,
+  /**
+   * Audio or video bit rate is invalid.
+   */
+  INVALID_BIT_RATE,
+}
+/*******************************************************************************
+ * 
+ * :: Call state graph
+ *
+ ******************************************************************************/
+bitmask CALL_STATE {
+  /**
+   * Set by the AV core if an error occurred on the remote end or if friend 
+   * timed out. This is the final state after which no more state
+   * transitions can occur for the call. This call state will never be triggered
+   * in combination with other call states.
+   */
+  ERROR,
+  /**
+   * The call has finished. This is the final state after which no more state
+   * transitions can occur for the call. This call state will never be 
+   * triggered in combination with other call states.
+   */
+  FINISHED,
+  /**
+   * The flag that marks that friend is sending audio.
+   */
+  SENDING_A,
+  /**
+   * The flag that marks that friend is sending video.
+   */
+  SENDING_V,
+  /**
+   * The flag that marks that friend is receiving audio.
+   */
+  RECEIVING_A,
+  /**
+   * The flag that marks that friend is receiving video.
+   */
+  RECEIVING_V,
+}
+event call_state {
+ /**
+  * The function type for the ${event call_state} callback.
+  *
+  * @param friend_number The friend number for which the call state changed.
+  * @param state The new call state which is guaranteed to be different than 
+  * the previous state. The state is set to 0 when the call is paused.
+  */
+  typedef void(uint32_t friend_number, uint32_t state);
+}
+/*******************************************************************************
+ * 
+ * :: Call control
+ *
+ ******************************************************************************/
+enum class CALL_CONTROL {
+  /**
+     * Resume a previously paused call. Only valid if the pause was caused by this
+     * client, if not, this control is ignored. Not valid before the call is accepted.
+     */
+    RESUME,
+    /**
+     * Put a call on hold. Not valid before the call is accepted.
+     */
+    PAUSE,
+    /**
+     * Reject a call if it was not answered, yet. Cancel a call after it was
+     * answered.
+     */
+    CANCEL,
+    /**
+     * Request that the friend stops sending audio. Regardless of the friend's
+     * compliance, this will cause the ${event audio.receive_frame} event to stop being
+     * triggered on receiving an audio frame from the friend.
+     */
+    MUTE_AUDIO,
+    /**
+     * Calling this control will notify client to start sending audio again.
+     */
+    UNMUTE_AUDIO,
+    /**
+     * Request that the friend stops sending video. Regardless of the friend's
+     * compliance, this will cause the ${event video.receive_frame} event to stop being
+     * triggered on receiving an video frame from the friend.
+     */
+    HIDE_VIDEO,
+    /**
+     * Calling this control will notify client to start sending video again.
+     */
+    SHOW_VIDEO,
+}
+/**
+ * Sends a call control command to a friend.
+ *
+ * @param friend_number The friend number of the friend this client is in a call
+ * with.
+ * @param control The control command to send.
+ *
+ * @return true on success.
+ */
+bool call_control (uint32_t friend_number, CALL_CONTROL control) {
+  /**
+   * The friend_number passed did not designate a valid friend.
+   */
+  FRIEND_NOT_FOUND,
+  /**
+   * This client is currently not in a call with the friend. Before the call is
+   * answered, only CANCEL is a valid control.
+   */
+  FRIEND_NOT_IN_CALL,
+  /**
+   * Happens if user tried to pause an already paused call or if trying to
+   * resume a call that is not paused.
+   */
+  INVALID_TRANSITION,
+}
+/*******************************************************************************
+ * 
+ * :: Controlling bit rates
+ *
+ ******************************************************************************/
+error for set_bit_rate {
+  /**
+   * The bit rate passed was not one of the supported values.
+   */
+  INVALID,
+  /**
+   * The friend_number passed did not designate a valid friend.
+   */
+  FRIEND_NOT_FOUND,
+  /**
+   * This client is currently not in a call with the friend.
+   */
+  FRIEND_NOT_IN_CALL,
+}
+namespace audio {
+  namespace bit_rate {
+    event status {
+      /**
+       * The function type for the ${event status} callback.
+       * 
+       * @param friend_number The friend number of the friend for which to set the
+       * audio bit rate.
+       * @param stable Is the stream stable enough to keep the bit rate. 
+       * Upon successful, non forceful, bit rate change, this is set to 
+       * true and 'bit_rate' is set to new bit rate.
+       * The stable is set to false with bit_rate set to the unstable
+       * bit rate when either current stream is unstable with said bit rate
+       * or the non forceful change failed.
+       * @param bit_rate The bit rate in Kb/sec.
+       */
+      typedef void(uint32_t friend_number, bool stable, uint32_t bit_rate);
+    }
+    /**
+     * Set the audio bit rate to be used in subsequent audio frames. If the passed 
+     * bit rate is the same as the current bit rate this function will return true 
+     * without calling a callback. If there is an active non forceful setup with the
+     * passed audio bit rate and the new set request is forceful, the bit rate is 
+     * forcefully set and the previous non forceful request is cancelled. The active
+     * non forceful setup will be canceled in favour of new non forceful setup.
+     *
+     * @param friend_number The friend number of the friend for which to set the
+     * audio bit rate.
+     * @param audio_bit_rate The new audio bit rate in Kb/sec. Set to 0 to disable
+     * audio sending.
+     * @param force True if the bit rate change is forceful.
+     * 
+     */
+    bool set(uint32_t friend_number, uint32_t audio_bit_rate, bool force) with error for set_bit_rate;
+  }
+}
+namespace video {
+  namespace bit_rate {
+    event status {
+      /**
+       * The function type for the ${event status} callback.
+       * 
+       * @param friend_number The friend number of the friend for which to set the
+       * video bit rate.
+       * @param stable Is the stream stable enough to keep the bit rate. 
+       * Upon successful, non forceful, bit rate change, this is set to 
+       * true and 'bit_rate' is set to new bit rate.
+       * The stable is set to false with bit_rate set to the unstable
+       * bit rate when either current stream is unstable with said bit rate
+       * or the non forceful change failed.
+       * @param bit_rate The bit rate in Kb/sec.
+       */
+      typedef void(uint32_t friend_number, bool stable, uint32_t bit_rate);
+    }
+    /**
+     * Set the video bit rate to be used in subsequent video frames. If the passed 
+     * bit rate is the same as the current bit rate this function will return true 
+     * without calling a callback. If there is an active non forceful setup with the
+     * passed video bit rate and the new set request is forceful, the bit rate is 
+     * forcefully set and the previous non forceful request is cancelled. The active
+     * non forceful setup will be canceled in favour of new non forceful setup.
+     *
+     * @param friend_number The friend number of the friend for which to set the
+     * video bit rate.
+     * @param audio_bit_rate The new video bit rate in Kb/sec. Set to 0 to disable
+     * video sending.
+     * @param force True if the bit rate change is forceful.
+     * 
+     */
+    bool set(uint32_t friend_number, uint32_t audio_bit_rate, bool force) with error for set_bit_rate;
+  }
+}
+/*******************************************************************************
+ * 
+ * :: A/V sending
+ *
+ ******************************************************************************/
+error for send_frame {
+  /**
+   * In case of video, one of Y, U, or V was NULL. In case of audio, the samples
+   * data pointer was NULL.
+   */
+  NULL,
+  /**
+   * The friend_number passed did not designate a valid friend.
+   */
+  FRIEND_NOT_FOUND,
+  /**
+   * This client is currently not in a call with the friend.
+   */
+  FRIEND_NOT_IN_CALL,
+  /**
+   * One of the frame parameters was invalid. E.g. the resolution may be too
+   * small or too large, or the audio sampling rate may be unsupported.
+   */
+  INVALID,
+  /**
+   * Failed to push frame through rtp interface.
+   */
+  RTP_FAILED,
+}
+namespace audio {
+  /**
+   * Send an audio frame to a friend.
+   *
+   * The expected format of the PCM data is: [s1c1][s1c2][...][s2c1][s2c2][...]...
+   * Meaning: sample 1 for channel 1, sample 1 for channel 2, ...
+   * For mono audio, this has no meaning, every sample is subsequent. For stereo,
+   * this means the expected format is LRLRLR... with samples for left and right
+   * alternating.
+   *
+   * @param friend_number The friend number of the friend to which to send an
+   * audio frame.
+   * @param pcm An array of audio samples. The size of this array must be
+   * sample_count * channels.
+   * @param sample_count Number of samples in this frame. Valid numbers here are
+   * ((sample rate) * (audio length) / 1000), where audio length can be
+   * 2.5, 5, 10, 20, 40 or 60 millseconds.
+   * @param channels Number of audio channels. Supported values are 1 and 2.
+   * @param sampling_rate Audio sampling rate used in this frame. Valid sampling
+   * rates are 8000, 12000, 16000, 24000, or 48000.
+   */
+  bool send_frame(uint32_t friend_number, const int16_t *pcm, size_t sample_count, 
+                  uint8_t channels, uint32_t sampling_rate) with error for send_frame;
+}
+namespace video {
+  /**
+   * Send a video frame to a friend.
+   *
+   * Y - plane should be of size: height * width
+   * U - plane should be of size: (height/2) * (width/2)
+   * V - plane should be of size: (height/2) * (width/2)
+   *
+   * @param friend_number The friend number of the friend to which to send a video
+   * frame.
+   * @param width Width of the frame in pixels.
+   * @param height Height of the frame in pixels.
+   * @param y Y (Luminance) plane data.
+   * @param u U (Chroma) plane data.
+   * @param v V (Chroma) plane data.
+   * @param a A (Alpha) plane data.
+   */
+  bool send_frame(uint32_t friend_number, uint16_t width, uint16_t height,
+                  const uint8_t *y, const uint8_t *u, const uint8_t *v, const uint8_t *a) with error for send_frame;
+}
+/*******************************************************************************
+ * 
+ * :: A/V receiving
+ *
+ ******************************************************************************/
+namespace audio {
+  event receive_frame {
+    /**
+     * The function type for the ${event receive_frame} callback.
+     *
+     * @param friend_number The friend number of the friend who sent an audio frame.
+     * @param pcm An array of audio samples (sample_count * channels elements).
+     * @param sample_count The number of audio samples per channel in the PCM array.
+     * @param channels Number of audio channels.
+     * @param sampling_rate Sampling rate used in this frame.
+     *
+     */
+    typedef void(uint32_t friend_number, const int16_t *pcm, size_t sample_count,
+                 uint8_t channels, uint32_t sampling_rate);
+  }
+}
+namespace video {
+  event receive_frame {
+    /**
+     * The function type for the ${event receive_frame} callback.
+     *
+     * @param friend_number The friend number of the friend who sent a video frame.
+     * @param width Width of the frame in pixels.
+     * @param height Height of the frame in pixels.
+     * @param y 
+     * @param u 
+     * @param v Plane data.
+     *          The size of plane data is derived from width and height where
+     *          Y = MAX(width, abs(ystride)) * height, 
+     *          U = MAX(width/2, abs(ustride)) * (height/2) and 
+     *          V = MAX(width/2, abs(vstride)) * (height/2).
+     *          A = MAX(width, abs(astride)) * height.
+     * @param ystride
+     * @param ustride
+     * @param vstride
+     * @param astride Strides data. Strides represent padding for each plane
+     *                that may or may not be present. You must handle strides in
+     *                your image processing code. Strides are negative if the 
+     *                image is bottom-up hence why you MUST abs() it when
+     *                calculating plane buffer size.
+     */
+    typedef void(uint32_t friend_number, uint16_t width, uint16_t height,
+                 const uint8_t *y, const uint8_t *u, const uint8_t *v, const uint8_t *a, 
+                 int32_t ystride, int32_t ustride, int32_t vstride, int32_t astride);
+  }
+}
+
+}
+%{
+#endif
+%}
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