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/*
* Copyright (c) 2019 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_UTILITY_DECODED_FRAMES_HISTORY_H_
#define MODULES_VIDEO_CODING_UTILITY_DECODED_FRAMES_HISTORY_H_
#include <stdint.h>
#include <bitset>
#include <vector>
#include "absl/types/optional.h"
#include "api/video/encoded_frame.h"
namespace webrtc {
namespace video_coding {
class DecodedFramesHistory {
public:
// window_size - how much frames back to the past are actually remembered.
explicit DecodedFramesHistory(size_t window_size);
~DecodedFramesHistory();
// Called for each decoded frame. Assumes picture id's are non-decreasing.
void InsertDecoded(const VideoLayerFrameId& frameid, uint32_t timestamp);
// Query if the following (picture_id, spatial_id) pair was inserted before.
// Should be at most less by window_size-1 than the last inserted picture id.
bool WasDecoded(const VideoLayerFrameId& frameid);
void Clear();
absl::optional<VideoLayerFrameId> GetLastDecodedFrameId();
absl::optional<uint32_t> GetLastDecodedFrameTimestamp();
private:
struct LayerHistory {
LayerHistory();
~LayerHistory();
// Cyclic bitset buffer. Stores last known |window_size| bits.
// last_stored_index is the last actually stored bit. Previous
// |window_size-1| bits are also in the memory. Value for i-th bit is at
// buffer[i % window_size].
std::vector<bool> buffer;
int64_t last_stored_index;
};
const int window_size_;
std::vector<LayerHistory> layers_;
absl::optional<VideoLayerFrameId> last_decoded_frame_;
absl::optional<uint32_t> last_decoded_frame_timestamp_;
};
} // namespace video_coding
} // namespace webrtc
#endif // MODULES_VIDEO_CODING_UTILITY_DECODED_FRAMES_HISTORY_H_