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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 WEBRTC_MODULES_VIDEO_CODING_DECODING_STATE_H_
#define WEBRTC_MODULES_VIDEO_CODING_DECODING_STATE_H_
#include "webrtc/typedefs.h"
namespace webrtc {
// Forward declarations
class VCMFrameBuffer;
class VCMPacket;
class VCMDecodingState {
public:
// The max number of bits used to reference back
// to a previous frame when using flexible mode.
static const uint16_t kNumRefBits = 7;
static const uint16_t kFrameDecodedLength = 1 << kNumRefBits;
VCMDecodingState();
~VCMDecodingState();
// Check for old frame
bool IsOldFrame(const VCMFrameBuffer* frame) const;
// Check for old packet
bool IsOldPacket(const VCMPacket* packet) const;
// Check for frame continuity based on current decoded state. Use best method
// possible, i.e. temporal info, picture ID or sequence number.
bool ContinuousFrame(const VCMFrameBuffer* frame) const;
void SetState(const VCMFrameBuffer* frame);
void CopyFrom(const VCMDecodingState& state);
bool UpdateEmptyFrame(const VCMFrameBuffer* frame);
// Update the sequence number if the timestamp matches current state and the
// sequence number is higher than the current one. This accounts for packets
// arriving late.
void UpdateOldPacket(const VCMPacket* packet);
void SetSeqNum(uint16_t new_seq_num);
void Reset();
uint32_t time_stamp() const;
uint16_t sequence_num() const;
// Return true if at initial state.
bool in_initial_state() const;
// Return true when sync is on - decode all layers.
bool full_sync() const;
private:
void UpdateSyncState(const VCMFrameBuffer* frame);
// Designated continuity functions
bool ContinuousPictureId(int picture_id) const;
bool ContinuousSeqNum(uint16_t seq_num) const;
bool ContinuousLayer(int temporal_id, int tl0_pic_id) const;
bool ContinuousFrameRefs(const VCMFrameBuffer* frame) const;
bool UsingPictureId(const VCMFrameBuffer* frame) const;
bool UsingFlexibleMode(const VCMFrameBuffer* frame) const;
bool AheadOfFramesDecodedClearedTo(uint16_t index) const;
// Keep state of last decoded frame.
// TODO(mikhal/stefan): create designated classes to handle these types.
uint16_t sequence_num_;
uint32_t time_stamp_;
int picture_id_;
int temporal_id_;
int tl0_pic_id_;
bool full_sync_; // Sync flag when temporal layers are used.
bool in_initial_state_;
// Used to check references in flexible mode.
bool frame_decoded_[kFrameDecodedLength];
uint16_t frame_decoded_cleared_to_;
};
} // namespace webrtc
#endif // WEBRTC_MODULES_VIDEO_CODING_DECODING_STATE_H_
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