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