Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 87 insertions, 0 deletions

diff --git a/third_party/libwebrtc/video/adaptation/bitrate_constraint.cc b/third_party/libwebrtc/video/adaptation/bitrate_constraint.cc
new file mode 100644
index 0000000000..bc36723d48
--- /dev/null
+++ b/third_party/libwebrtc/video/adaptation/bitrate_constraint.cc
@@ -0,0 +1,87 @@
+/*
+ *  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 "video/adaptation/bitrate_constraint.h"
+
+#include <utility>
+#include <vector>
+
+#include "api/sequence_checker.h"
+#include "call/adaptation/video_stream_adapter.h"
+#include "video/adaptation/video_stream_encoder_resource_manager.h"
+
+namespace webrtc {
+
+BitrateConstraint::BitrateConstraint()
+    : encoder_settings_(absl::nullopt),
+      encoder_target_bitrate_bps_(absl::nullopt) {
+  sequence_checker_.Detach();
+}
+
+void BitrateConstraint::OnEncoderSettingsUpdated(
+    absl::optional<EncoderSettings> encoder_settings) {
+  RTC_DCHECK_RUN_ON(&sequence_checker_);
+  encoder_settings_ = std::move(encoder_settings);
+}
+
+void BitrateConstraint::OnEncoderTargetBitrateUpdated(
+    absl::optional<uint32_t> encoder_target_bitrate_bps) {
+  RTC_DCHECK_RUN_ON(&sequence_checker_);
+  encoder_target_bitrate_bps_ = std::move(encoder_target_bitrate_bps);
+}
+
+// Checks if resolution is allowed to adapt up based on the current bitrate and
+// ResolutionBitrateLimits.min_start_bitrate_bps for the next higher resolution.
+// Bitrate limits usage is restricted to a single active stream/layer (e.g. when
+// quality scaling is enabled).
+bool BitrateConstraint::IsAdaptationUpAllowed(
+    const VideoStreamInputState& input_state,
+    const VideoSourceRestrictions& restrictions_before,
+    const VideoSourceRestrictions& restrictions_after) const {
+  RTC_DCHECK_RUN_ON(&sequence_checker_);
+  // Make sure bitrate limits are not violated.
+  if (DidIncreaseResolution(restrictions_before, restrictions_after)) {
+    if (!encoder_settings_.has_value()) {
+      return true;
+    }
+
+    uint32_t bitrate_bps = encoder_target_bitrate_bps_.value_or(0);
+    if (bitrate_bps == 0) {
+      return true;
+    }
+
+    if (VideoStreamEncoderResourceManager::IsSimulcastOrMultipleSpatialLayers(
+            encoder_settings_->encoder_config())) {
+      // Resolution bitrate limits usage is restricted to singlecast.
+      return true;
+    }
+
+    absl::optional<int> current_frame_size_px =
+        input_state.single_active_stream_pixels();
+    if (!current_frame_size_px.has_value()) {
+      return true;
+    }
+
+    absl::optional<VideoEncoder::ResolutionBitrateLimits> bitrate_limits =
+        encoder_settings_->encoder_info().GetEncoderBitrateLimitsForResolution(
+            // Need some sort of expected resulting pixels to be used
+            // instead of unrestricted.
+            GetHigherResolutionThan(*current_frame_size_px));
+
+    if (bitrate_limits.has_value()) {
+      RTC_DCHECK_GE(bitrate_limits->frame_size_pixels, *current_frame_size_px);
+      return bitrate_bps >=
+             static_cast<uint32_t>(bitrate_limits->min_start_bitrate_bps);
+    }
+  }
+  return true;
+}
+
+}  // namespace webrtc