/*
 *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

/*
 * This file defines classes for doing reference picture selection, primarily
 * with VP8.
 */

/* Modified by Yoann Blein, 2012 (remove time handling for simplicity)
 */

#pragma once

#include <stdint.h>

namespace Swift {
	class ReferencePictureSelection {
		public:
			ReferencePictureSelection();

			// Report a received reference picture selection indication. This will
			// introduce a new established reference if the received RPSI isn't too late.
			void ReceivedRPSI(int rpsi_picture_id);

			// Report a received slice loss indication. Returns true if a refresh frame
			// must be sent to the receiver, which is accomplished by only predicting
			// from the established reference.
			// |now_ts| is the RTP timestamp corresponding to the current time. Typically
			// the capture timestamp of the frame currently being processed.
			// Returns true if it's time to encode a decoder refresh, otherwise false.
			void ReceivedSLI();

			// Returns the recommended VP8 encode flags needed. May refresh the decoder
			// and/or update the reference buffers.
			// |picture_id| picture id of the frame to be encoded.
			// |send_refresh| should be set to true if a decoder refresh should be
			// encoded, otherwise false.
			// |now_ts| is the RTP timestamp corresponding to the current time. Typically
			// the capture timestamp of the frame currently being processed.
			// Returns the flags to be given to the libvpx encoder when encoding the next
			// frame.
			int EncodeFlags(int picture_id);

			// Notify the RPS that the frame with picture id |picture_id| was encoded as
			// a key frame, effectively updating all reference buffers.
			void refFrameSent(int picture_id);

		private:
			bool update_golden_next_;
			bool established_golden_;
			bool received_ack_;
			int last_sent_ref_picture_id_;
			int established_ref_picture_id_;
			bool send_refresh;
	};
}