64 lines
2.0 KiB
C++
64 lines
2.0 KiB
C++
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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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#include "modules/video_coding/timestamp_map.h"
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#include <stdlib.h>
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#include "modules/include/module_common_types_public.h"
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namespace webrtc {
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VCMTimestampMap::VCMTimestampMap(size_t capacity)
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: ring_buffer_(new TimestampDataTuple[capacity]),
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capacity_(capacity),
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next_add_idx_(0),
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next_pop_idx_(0) {}
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VCMTimestampMap::~VCMTimestampMap() {}
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void VCMTimestampMap::Add(uint32_t timestamp, VCMFrameInformation* data) {
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ring_buffer_[next_add_idx_].timestamp = timestamp;
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ring_buffer_[next_add_idx_].data = data;
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next_add_idx_ = (next_add_idx_ + 1) % capacity_;
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if (next_add_idx_ == next_pop_idx_) {
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// Circular list full; forget oldest entry.
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next_pop_idx_ = (next_pop_idx_ + 1) % capacity_;
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}
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}
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VCMFrameInformation* VCMTimestampMap::Pop(uint32_t timestamp) {
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while (!IsEmpty()) {
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if (ring_buffer_[next_pop_idx_].timestamp == timestamp) {
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// Found start time for this timestamp.
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VCMFrameInformation* data = ring_buffer_[next_pop_idx_].data;
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ring_buffer_[next_pop_idx_].data = nullptr;
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next_pop_idx_ = (next_pop_idx_ + 1) % capacity_;
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return data;
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} else if (IsNewerTimestamp(ring_buffer_[next_pop_idx_].timestamp,
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timestamp)) {
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// The timestamp we are looking for is not in the list.
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return nullptr;
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}
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// Not in this position, check next (and forget this position).
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next_pop_idx_ = (next_pop_idx_ + 1) % capacity_;
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}
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// Could not find matching timestamp in list.
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return nullptr;
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}
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bool VCMTimestampMap::IsEmpty() const {
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return (next_add_idx_ == next_pop_idx_);
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}
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} // namespace webrtc
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