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/*
* Copyright (c) 2020 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 "modules/video_coding/frame_dependencies_calculator.h"
#include <stdint.h>
#include <iterator>
#include <set>
#include "absl/algorithm/container.h"
#include "absl/container/inlined_vector.h"
#include "api/array_view.h"
#include "rtc_base/checks.h"
#include "rtc_base/logging.h"
namespace webrtc {
absl::InlinedVector<int64_t, 5> FrameDependenciesCalculator::FromBuffersUsage(
int64_t frame_id,
rtc::ArrayView<const CodecBufferUsage> buffers_usage) {
absl::InlinedVector<int64_t, 5> dependencies;
RTC_DCHECK_GT(buffers_usage.size(), 0);
for (const CodecBufferUsage& buffer_usage : buffers_usage) {
RTC_CHECK_GE(buffer_usage.id, 0);
if (buffers_.size() <= static_cast<size_t>(buffer_usage.id)) {
buffers_.resize(buffer_usage.id + 1);
}
}
std::set<int64_t> direct_depenendencies;
std::set<int64_t> indirect_depenendencies;
for (const CodecBufferUsage& buffer_usage : buffers_usage) {
if (!buffer_usage.referenced) {
continue;
}
const BufferUsage& buffer = buffers_[buffer_usage.id];
if (buffer.frame_id == absl::nullopt) {
RTC_LOG(LS_ERROR) << "Odd configuration: frame " << frame_id
<< " references buffer #" << buffer_usage.id
<< " that was never updated.";
continue;
}
direct_depenendencies.insert(*buffer.frame_id);
indirect_depenendencies.insert(buffer.dependencies.begin(),
buffer.dependencies.end());
}
// Reduce references: if frame #3 depends on frame #2 and #1, and frame #2
// depends on frame #1, then frame #3 needs to depend just on frame #2.
// Though this set diff removes only 1 level of indirection, it seems
// enough for all currently used structures.
absl::c_set_difference(direct_depenendencies, indirect_depenendencies,
std::back_inserter(dependencies));
// Update buffers.
for (const CodecBufferUsage& buffer_usage : buffers_usage) {
if (!buffer_usage.updated) {
continue;
}
BufferUsage& buffer = buffers_[buffer_usage.id];
buffer.frame_id = frame_id;
buffer.dependencies.assign(direct_depenendencies.begin(),
direct_depenendencies.end());
}
return dependencies;
}
} // namespace webrtc
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