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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 <limits>
#include <numeric>
#include "base/logging.h"
namespace media {
constexpr size_t VideoBitrateAllocation::kMaxSpatialLayers;
constexpr size_t VideoBitrateAllocation::kMaxTemporalLayers;
VideoBitrateAllocation::VideoBitrateAllocation() : 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);
if (GetSumBps() - bitrates_[spatial_index][temporal_index] >
std::numeric_limits<int>::max() - bitrate_bps) {
return false; // Would cause overflow of the sum.
}
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 {
int sum = 0;
for (size_t spatial_index = 0; spatial_index < kMaxSpatialLayers;
++spatial_index) {
for (size_t temporal_index = 0; temporal_index < kMaxTemporalLayers;
++temporal_index) {
sum += bitrates_[spatial_index][temporal_index];
}
}
return sum;
}
} // namespace media
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