1 /* 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 /* 12 * This file defines classes for doing reference picture selection, primarily 13 * with VP8. 14 */ 15 16 #ifndef WEBRTC_MODULES_VIDEO_CODING_CODECS_REFERENCE_PICTURE_SELECTION_H_ 17 #define WEBRTC_MODULES_VIDEO_CODING_CODECS_REFERENCE_PICTURE_SELECTION_H_ 18 19 #include "webrtc/typedefs.h" 20 21 namespace webrtc { 22 23 class ReferencePictureSelection { 24 public: 25 ReferencePictureSelection(); 26 void Init(); 27 28 // Report a received reference picture selection indication. This will 29 // introduce a new established reference if the received RPSI isn't too late. 30 void ReceivedRPSI(int rpsi_picture_id); 31 32 // Report a received slice loss indication. Returns true if a refresh frame 33 // must be sent to the receiver, which is accomplished by only predicting 34 // from the established reference. 35 // |now_ts| is the RTP timestamp corresponding to the current time. Typically 36 // the capture timestamp of the frame currently being processed. 37 // Returns true if it's time to encode a decoder refresh, otherwise false. 38 bool ReceivedSLI(uint32_t now_ts); 39 40 // Returns the recommended VP8 encode flags needed. May refresh the decoder 41 // and/or update the reference buffers. 42 // |picture_id| picture id of the frame to be encoded. 43 // |send_refresh| should be set to true if a decoder refresh should be 44 // encoded, otherwise false. 45 // |now_ts| is the RTP timestamp corresponding to the current time. Typically 46 // the capture timestamp of the frame currently being processed. 47 // Returns the flags to be given to the libvpx encoder when encoding the next 48 // frame. 49 int EncodeFlags(int picture_id, bool send_refresh, uint32_t now_ts); 50 51 // Notify the RPS that the frame with picture id |picture_id| was encoded as 52 // a key frame, effectively updating all reference buffers. 53 void EncodedKeyFrame(int picture_id); 54 55 // Set the round-trip time between the sender and the receiver to |rtt| 56 // milliseconds. 57 void SetRtt(int64_t rtt); 58 59 private: 60 static int64_t TimestampDiff(uint32_t new_ts, uint32_t old_ts); 61 62 const double kRttConfidence; 63 64 bool update_golden_next_; 65 bool established_golden_; 66 bool received_ack_; 67 int last_sent_ref_picture_id_; 68 uint32_t last_sent_ref_update_time_; 69 int established_ref_picture_id_; 70 uint32_t last_refresh_time_; 71 int64_t rtt_; 72 }; 73 74 } // namespace webrtc 75 76 #endif // WEBRTC_MODULES_VIDEO_CODING_CODECS_REFERENCE_PICTURE_SELECTION_H_ 77
