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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.
+ */
+
+#ifndef MODULES_VIDEO_CODING_SESSION_INFO_H_
+#define MODULES_VIDEO_CODING_SESSION_INFO_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include <list>
+#include <vector>
+
+#include "modules/video_coding/codecs/h264/include/h264_globals.h"
+#include "modules/video_coding/codecs/vp9/include/vp9_globals.h"
+#include "modules/video_coding/include/video_coding.h"
+#include "modules/video_coding/packet.h"
+
+namespace webrtc {
+// Used to pass data from jitter buffer to session info.
+// This data is then used in determining whether a frame is decodable.
+struct FrameData {
+ int64_t rtt_ms;
+ float rolling_average_packets_per_frame;
+};
+
+class VCMSessionInfo {
+ public:
+ VCMSessionInfo();
+ ~VCMSessionInfo();
+
+ void UpdateDataPointers(const uint8_t* old_base_ptr,
+ const uint8_t* new_base_ptr);
+ void Reset();
+ int InsertPacket(const VCMPacket& packet,
+ uint8_t* frame_buffer,
+ const FrameData& frame_data);
+ bool complete() const;
+
+ // Makes the frame decodable. I.e., only contain decodable NALUs. All
+ // non-decodable NALUs will be deleted and packets will be moved to in
+ // memory to remove any empty space.
+ // Returns the number of bytes deleted from the session.
+ size_t MakeDecodable();
+
+ size_t SessionLength() const;
+ int NumPackets() const;
+ bool HaveFirstPacket() const;
+ bool HaveLastPacket() const;
+ webrtc::VideoFrameType FrameType() const { return frame_type_; }
+ int LowSequenceNumber() const;
+
+ // Returns highest sequence number, media or empty.
+ int HighSequenceNumber() const;
+ int PictureId() const;
+ int TemporalId() const;
+ bool LayerSync() const;
+ int Tl0PicId() const;
+
+ std::vector<NaluInfo> GetNaluInfos() const;
+
+ void SetGofInfo(const GofInfoVP9& gof_info, size_t idx);
+
+ private:
+ enum { kMaxVP8Partitions = 9 };
+
+ typedef std::list<VCMPacket> PacketList;
+ typedef PacketList::iterator PacketIterator;
+ typedef PacketList::const_iterator PacketIteratorConst;
+ typedef PacketList::reverse_iterator ReversePacketIterator;
+
+ void InformOfEmptyPacket(uint16_t seq_num);
+
+ // Finds the packet of the beginning of the next VP8 partition. If
+ // none is found the returned iterator points to `packets_.end()`.
+ // `it` is expected to point to the last packet of the previous partition,
+ // or to the first packet of the frame. `packets_skipped` is incremented
+ // for each packet found which doesn't have the beginning bit set.
+ PacketIterator FindNextPartitionBeginning(PacketIterator it) const;
+
+ // Returns an iterator pointing to the last packet of the partition pointed to
+ // by `it`.
+ PacketIterator FindPartitionEnd(PacketIterator it) const;
+ static bool InSequence(const PacketIterator& it,
+ const PacketIterator& prev_it);
+ size_t InsertBuffer(uint8_t* frame_buffer, PacketIterator packetIterator);
+ size_t Insert(const uint8_t* buffer,
+ size_t length,
+ bool insert_start_code,
+ uint8_t* frame_buffer);
+ void ShiftSubsequentPackets(PacketIterator it, int steps_to_shift);
+ PacketIterator FindNaluEnd(PacketIterator packet_iter) const;
+ // Deletes the data of all packets between `start` and `end`, inclusively.
+ // Note that this function doesn't delete the actual packets.
+ size_t DeletePacketData(PacketIterator start, PacketIterator end);
+ void UpdateCompleteSession();
+
+ bool complete_;
+ webrtc::VideoFrameType frame_type_;
+ // Packets in this frame.
+ PacketList packets_;
+ int empty_seq_num_low_;
+ int empty_seq_num_high_;
+
+ // The following two variables correspond to the first and last media packets
+ // in a session defined by the first packet flag and the marker bit.
+ // They are not necessarily equal to the front and back packets, as packets
+ // may enter out of order.
+ // TODO(mikhal): Refactor the list to use a map.
+ int first_packet_seq_num_;
+ int last_packet_seq_num_;
+};
+
+} // namespace webrtc
+
+#endif // MODULES_VIDEO_CODING_SESSION_INFO_H_