1 files changed, 173 insertions, 0 deletions
diff --git a/third_party/libwebrtc/call/adaptation/video_source_restrictions.cc b/third_party/libwebrtc/call/adaptation/video_source_restrictions.cc
new file mode 100644
index 0000000000..719bc53278
--- /dev/null
+++ b/third_party/libwebrtc/call/adaptation/video_source_restrictions.cc
@@ -0,0 +1,173 @@
+/*
+ *  Copyright 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 "call/adaptation/video_source_restrictions.h"
+
+#include <algorithm>
+#include <limits>
+
+#include "rtc_base/checks.h"
+#include "rtc_base/strings/string_builder.h"
+
+namespace webrtc {
+
+VideoSourceRestrictions::VideoSourceRestrictions()
+    : max_pixels_per_frame_(absl::nullopt),
+      target_pixels_per_frame_(absl::nullopt),
+      max_frame_rate_(absl::nullopt) {}
+
+VideoSourceRestrictions::VideoSourceRestrictions(
+    absl::optional<size_t> max_pixels_per_frame,
+    absl::optional<size_t> target_pixels_per_frame,
+    absl::optional<double> max_frame_rate)
+    : max_pixels_per_frame_(std::move(max_pixels_per_frame)),
+      target_pixels_per_frame_(std::move(target_pixels_per_frame)),
+      max_frame_rate_(std::move(max_frame_rate)) {
+  RTC_DCHECK(!max_pixels_per_frame_.has_value() ||
+             max_pixels_per_frame_.value() <
+                 static_cast<size_t>(std::numeric_limits<int>::max()));
+  RTC_DCHECK(!max_frame_rate_.has_value() ||
+             max_frame_rate_.value() < std::numeric_limits<int>::max());
+  RTC_DCHECK(!max_frame_rate_.has_value() || max_frame_rate_.value() > 0.0);
+}
+
+std::string VideoSourceRestrictions::ToString() const {
+  rtc::StringBuilder ss;
+  ss << "{";
+  if (max_frame_rate_)
+    ss << " max_fps=" << max_frame_rate_.value();
+  if (max_pixels_per_frame_)
+    ss << " max_pixels_per_frame=" << max_pixels_per_frame_.value();
+  if (target_pixels_per_frame_)
+    ss << " target_pixels_per_frame=" << target_pixels_per_frame_.value();
+  ss << " }";
+  return ss.Release();
+}
+
+const absl::optional<size_t>& VideoSourceRestrictions::max_pixels_per_frame()
+    const {
+  return max_pixels_per_frame_;
+}
+
+const absl::optional<size_t>& VideoSourceRestrictions::target_pixels_per_frame()
+    const {
+  return target_pixels_per_frame_;
+}
+
+const absl::optional<double>& VideoSourceRestrictions::max_frame_rate() const {
+  return max_frame_rate_;
+}
+
+void VideoSourceRestrictions::set_max_pixels_per_frame(
+    absl::optional<size_t> max_pixels_per_frame) {
+  max_pixels_per_frame_ = std::move(max_pixels_per_frame);
+}
+
+void VideoSourceRestrictions::set_target_pixels_per_frame(
+    absl::optional<size_t> target_pixels_per_frame) {
+  target_pixels_per_frame_ = std::move(target_pixels_per_frame);
+}
+
+void VideoSourceRestrictions::set_max_frame_rate(
+    absl::optional<double> max_frame_rate) {
+  max_frame_rate_ = std::move(max_frame_rate);
+}
+
+void VideoSourceRestrictions::UpdateMin(const VideoSourceRestrictions& other) {
+  if (max_pixels_per_frame_.has_value()) {
+    max_pixels_per_frame_ = std::min(*max_pixels_per_frame_,
+                                     other.max_pixels_per_frame().value_or(
+                                         std::numeric_limits<size_t>::max()));
+  } else {
+    max_pixels_per_frame_ = other.max_pixels_per_frame();
+  }
+  if (target_pixels_per_frame_.has_value()) {
+    target_pixels_per_frame_ = std::min(
+        *target_pixels_per_frame_, other.target_pixels_per_frame().value_or(
+                                       std::numeric_limits<size_t>::max()));
+  } else {
+    target_pixels_per_frame_ = other.target_pixels_per_frame();
+  }
+  if (max_frame_rate_.has_value()) {
+    max_frame_rate_ = std::min(
+        *max_frame_rate_,
+        other.max_frame_rate().value_or(std::numeric_limits<double>::max()));
+  } else {
+    max_frame_rate_ = other.max_frame_rate();
+  }
+}
+
+bool DidRestrictionsIncrease(VideoSourceRestrictions before,
+                             VideoSourceRestrictions after) {
+  bool decreased_resolution = DidDecreaseResolution(before, after);
+  bool decreased_framerate = DidDecreaseFrameRate(before, after);
+  bool same_resolution =
+      before.max_pixels_per_frame() == after.max_pixels_per_frame();
+  bool same_framerate = before.max_frame_rate() == after.max_frame_rate();
+
+  return (decreased_resolution && decreased_framerate) ||
+         (decreased_resolution && same_framerate) ||
+         (same_resolution && decreased_framerate);
+}
+
+bool DidRestrictionsDecrease(VideoSourceRestrictions before,
+                             VideoSourceRestrictions after) {
+  bool increased_resolution = DidIncreaseResolution(before, after);
+  bool increased_framerate = DidIncreaseFrameRate(before, after);
+  bool same_resolution =
+      before.max_pixels_per_frame() == after.max_pixels_per_frame();
+  bool same_framerate = before.max_frame_rate() == after.max_frame_rate();
+
+  return (increased_resolution && increased_framerate) ||
+         (increased_resolution && same_framerate) ||
+         (same_resolution && increased_framerate);
+}
+
+bool DidIncreaseResolution(VideoSourceRestrictions restrictions_before,
+                           VideoSourceRestrictions restrictions_after) {
+  if (!restrictions_before.max_pixels_per_frame().has_value())
+    return false;
+  if (!restrictions_after.max_pixels_per_frame().has_value())
+    return true;
+  return restrictions_after.max_pixels_per_frame().value() >
+         restrictions_before.max_pixels_per_frame().value();
+}
+
+bool DidDecreaseResolution(VideoSourceRestrictions restrictions_before,
+                           VideoSourceRestrictions restrictions_after) {
+  if (!restrictions_after.max_pixels_per_frame().has_value())
+    return false;
+  if (!restrictions_before.max_pixels_per_frame().has_value())
+    return true;
+  return restrictions_after.max_pixels_per_frame().value() <
+         restrictions_before.max_pixels_per_frame().value();
+}
+
+bool DidIncreaseFrameRate(VideoSourceRestrictions restrictions_before,
+                          VideoSourceRestrictions restrictions_after) {
+  if (!restrictions_before.max_frame_rate().has_value())
+    return false;
+  if (!restrictions_after.max_frame_rate().has_value())
+    return true;
+  return restrictions_after.max_frame_rate().value() >
+         restrictions_before.max_frame_rate().value();
+}
+
+bool DidDecreaseFrameRate(VideoSourceRestrictions restrictions_before,
+                          VideoSourceRestrictions restrictions_after) {
+  if (!restrictions_after.max_frame_rate().has_value())
+    return false;
+  if (!restrictions_before.max_frame_rate().has_value())
+    return true;
+  return restrictions_after.max_frame_rate().value() <
+         restrictions_before.max_frame_rate().value();
+}
+
+}  // namespace webrtc