| // 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" |
| #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 |