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/*
* 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.
*/
#ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_REFERENCE_PICTURE_SELECTION_H_
#define WEBRTC_MODULES_VIDEO_CODING_CODECS_REFERENCE_PICTURE_SELECTION_H_
#include "webrtc/typedefs.h"
namespace webrtc {
class ReferencePictureSelection {
public:
ReferencePictureSelection();
void Init();
// 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.
bool ReceivedSLI(uint32_t now_ts);
// 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, bool send_refresh, uint32_t now_ts);
// Notify the RPS that the frame with picture id |picture_id| was encoded as
// a key frame, effectively updating all reference buffers.
void EncodedKeyFrame(int picture_id);
// Set the round-trip time between the sender and the receiver to |rtt|
// milliseconds.
void SetRtt(int rtt);
private:
static uint32_t TimestampDiff(uint32_t new_ts, uint32_t old_ts);
// The minimum time between reference frame updates.
enum { kMinUpdateInterval = 90 * 10 }; // Timestamp frequency
const double kRttConfidence;
bool update_golden_next_;
bool established_golden_;
bool received_ack_;
int last_sent_ref_picture_id_;
uint32_t last_sent_ref_update_time_;
int established_ref_picture_id_;
uint32_t last_refresh_time_;
uint32_t rtt_;
};
} // namespace webrtc
#endif // WEBRTC_MODULES_VIDEO_CODING_CODECS_REFERENCE_PICTURE_SELECTION_H_
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