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// Copyright 2018 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "video_bitrate_allocation.h"
#include <cstring>
#include <limits>
#include <numeric>
#include "base/check_op.h"
#include "base/numerics/checked_math.h"
namespace media {
constexpr size_t VideoBitrateAllocation::kMaxSpatialLayers;
constexpr size_t VideoBitrateAllocation::kMaxTemporalLayers;
VideoBitrateAllocation::VideoBitrateAllocation() : sum_(0), bitrates_{} {}
bool VideoBitrateAllocation::SetBitrate(size_t spatial_index,
size_t temporal_index,
int bitrate_bps) {
CHECK_LT(spatial_index, kMaxSpatialLayers);
CHECK_LT(temporal_index, kMaxTemporalLayers);
CHECK_GE(bitrate_bps, 0);
base::CheckedNumeric<int> checked_sum = sum_;
checked_sum -= bitrates_[spatial_index][temporal_index];
checked_sum += bitrate_bps;
if (!checked_sum.IsValid()) {
return false; // Would cause overflow of the sum.
}
sum_ = checked_sum.ValueOrDie();
bitrates_[spatial_index][temporal_index] = bitrate_bps;
return true;
}
int VideoBitrateAllocation::GetBitrateBps(size_t spatial_index,
size_t temporal_index) const {
CHECK_LT(spatial_index, kMaxSpatialLayers);
CHECK_LT(temporal_index, kMaxTemporalLayers);
return bitrates_[spatial_index][temporal_index];
}
int VideoBitrateAllocation::GetSumBps() const {
return sum_;
}
bool VideoBitrateAllocation::operator==(
const VideoBitrateAllocation& other) const {
if (sum_ != other.sum_) {
return false;
}
return memcmp(bitrates_, other.bitrates_, sizeof(bitrates_)) == 0;
}
} // namespace media
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