2020-08-14 16:58:22 +00:00
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/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_VIDEO_CODING_DECODING_STATE_H_
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#define MODULES_VIDEO_CODING_DECODING_STATE_H_
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2021-06-25 00:43:10 +00:00
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#include <cstdint>
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2020-08-14 16:58:22 +00:00
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#include <map>
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#include <set>
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#include <vector>
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namespace webrtc {
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// Forward declarations
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struct NaluInfo;
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class VCMFrameBuffer;
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class VCMPacket;
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class VCMDecodingState {
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public:
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// The max number of bits used to reference back
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// to a previous frame when using flexible mode.
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static const uint16_t kNumRefBits = 7;
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static const uint16_t kFrameDecodedLength = 1 << kNumRefBits;
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VCMDecodingState();
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~VCMDecodingState();
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// Check for old frame
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bool IsOldFrame(const VCMFrameBuffer* frame) const;
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// Check for old packet
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bool IsOldPacket(const VCMPacket* packet) const;
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// Check for frame continuity based on current decoded state. Use best method
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// possible, i.e. temporal info, picture ID or sequence number.
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bool ContinuousFrame(const VCMFrameBuffer* frame) const;
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void SetState(const VCMFrameBuffer* frame);
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void CopyFrom(const VCMDecodingState& state);
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bool UpdateEmptyFrame(const VCMFrameBuffer* frame);
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// Update the sequence number if the timestamp matches current state and the
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// sequence number is higher than the current one. This accounts for packets
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// arriving late.
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void UpdateOldPacket(const VCMPacket* packet);
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void SetSeqNum(uint16_t new_seq_num);
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void Reset();
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uint32_t time_stamp() const;
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uint16_t sequence_num() const;
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// Return true if at initial state.
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bool in_initial_state() const;
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// Return true when sync is on - decode all layers.
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bool full_sync() const;
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private:
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void UpdateSyncState(const VCMFrameBuffer* frame);
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// Designated continuity functions
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bool ContinuousPictureId(int picture_id) const;
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bool ContinuousSeqNum(uint16_t seq_num) const;
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bool ContinuousLayer(int temporal_id, int tl0_pic_id) const;
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bool ContinuousFrameRefs(const VCMFrameBuffer* frame) const;
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bool UsingPictureId(const VCMFrameBuffer* frame) const;
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bool UsingFlexibleMode(const VCMFrameBuffer* frame) const;
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bool AheadOfFramesDecodedClearedTo(uint16_t index) const;
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bool HaveSpsAndPps(const std::vector<NaluInfo>& nalus) const;
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// Keep state of last decoded frame.
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// TODO(mikhal/stefan): create designated classes to handle these types.
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uint16_t sequence_num_;
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uint32_t time_stamp_;
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int picture_id_;
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int temporal_id_;
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int tl0_pic_id_;
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bool full_sync_; // Sync flag when temporal layers are used.
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bool in_initial_state_;
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// Used to check references in flexible mode.
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bool frame_decoded_[kFrameDecodedLength];
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uint16_t frame_decoded_cleared_to_;
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std::set<int> received_sps_;
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std::map<int, int> received_pps_;
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};
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} // namespace webrtc
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#endif // MODULES_VIDEO_CODING_DECODING_STATE_H_
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