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 #ifndef WEBRTC_MODULES_VIDEO_CODING_DECODING_STATE_H_ 12 #define WEBRTC_MODULES_VIDEO_CODING_DECODING_STATE_H_ 13 14 #include "webrtc/typedefs.h" 15 16 namespace webrtc { 17 18 // Forward declarations 19 class VCMFrameBuffer; 20 class VCMPacket; 21 22 class VCMDecodingState { 23 public: 24 VCMDecodingState(); 25 ~VCMDecodingState(); 26 // Check for old frame 27 bool IsOldFrame(const VCMFrameBuffer* frame) const; 28 // Check for old packet 29 bool IsOldPacket(const VCMPacket* packet) const; 30 // Check for frame continuity based on current decoded state. Use best method 31 // possible, i.e. temporal info, picture ID or sequence number. 32 bool ContinuousFrame(const VCMFrameBuffer* frame) const; 33 void SetState(const VCMFrameBuffer* frame); 34 void CopyFrom(const VCMDecodingState& state); 35 bool UpdateEmptyFrame(const VCMFrameBuffer* frame); 36 // Update the sequence number if the timestamp matches current state and the 37 // sequence number is higher than the current one. This accounts for packets 38 // arriving late. 39 void UpdateOldPacket(const VCMPacket* packet); 40 void SetSeqNum(uint16_t new_seq_num); 41 void Reset(); 42 uint32_t time_stamp() const; 43 uint16_t sequence_num() const; 44 // Return true if at initial state. 45 bool in_initial_state() const; 46 // Return true when sync is on - decode all layers. 47 bool full_sync() const; 48 49 private: 50 void UpdateSyncState(const VCMFrameBuffer* frame); 51 // Designated continuity functions 52 bool ContinuousPictureId(int picture_id) const; 53 bool ContinuousSeqNum(uint16_t seq_num) const; 54 bool ContinuousLayer(int temporal_id, int tl0_pic_id) const; 55 bool UsingPictureId(const VCMFrameBuffer* frame) const; 56 57 // Keep state of last decoded frame. 58 // TODO(mikhal/stefan): create designated classes to handle these types. 59 uint16_t sequence_num_; 60 uint32_t time_stamp_; 61 int picture_id_; 62 int temporal_id_; 63 int tl0_pic_id_; 64 bool full_sync_; // Sync flag when temporal layers are used. 65 bool in_initial_state_; 66 }; 67 68 } // namespace webrtc 69 70 #endif // WEBRTC_MODULES_VIDEO_CODING_DECODING_STATE_H_ 71
