103 lines
3.6 KiB
C++
103 lines
3.6 KiB
C++
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/*
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* Copyright 2020 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "video/adaptation/pixel_limit_resource.h"
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#include "api/sequence_checker.h"
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#include "api/units/time_delta.h"
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#include "call/adaptation/video_stream_adapter.h"
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#include "rtc_base/checks.h"
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#include "rtc_base/ref_counted_object.h"
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namespace webrtc {
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namespace {
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constexpr TimeDelta kResourceUsageCheckIntervalMs = TimeDelta::Seconds(5);
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} // namespace
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// static
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rtc::scoped_refptr<PixelLimitResource> PixelLimitResource::Create(
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TaskQueueBase* task_queue,
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VideoStreamInputStateProvider* input_state_provider) {
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return rtc::make_ref_counted<PixelLimitResource>(task_queue,
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input_state_provider);
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}
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PixelLimitResource::PixelLimitResource(
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TaskQueueBase* task_queue,
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VideoStreamInputStateProvider* input_state_provider)
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: task_queue_(task_queue),
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input_state_provider_(input_state_provider),
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max_pixels_(absl::nullopt) {
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RTC_DCHECK(task_queue_);
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RTC_DCHECK(input_state_provider_);
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}
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PixelLimitResource::~PixelLimitResource() {
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RTC_DCHECK(!listener_);
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RTC_DCHECK(!repeating_task_.Running());
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}
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void PixelLimitResource::SetMaxPixels(int max_pixels) {
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RTC_DCHECK_RUN_ON(task_queue_);
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max_pixels_ = max_pixels;
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}
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void PixelLimitResource::SetResourceListener(ResourceListener* listener) {
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RTC_DCHECK_RUN_ON(task_queue_);
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listener_ = listener;
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if (listener_) {
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repeating_task_.Stop();
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repeating_task_ = RepeatingTaskHandle::Start(task_queue_, [&] {
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RTC_DCHECK_RUN_ON(task_queue_);
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if (!listener_) {
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// We don't have a listener so resource adaptation must not be running,
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// try again later.
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return kResourceUsageCheckIntervalMs;
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}
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if (!max_pixels_.has_value()) {
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// No pixel limit configured yet, try again later.
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return kResourceUsageCheckIntervalMs;
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}
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absl::optional<int> frame_size_pixels =
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input_state_provider_->InputState().frame_size_pixels();
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if (!frame_size_pixels.has_value()) {
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// We haven't observed a frame yet so we don't know if it's going to be
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// too big or too small, try again later.
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return kResourceUsageCheckIntervalMs;
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}
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int current_pixels = frame_size_pixels.value();
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int target_pixel_upper_bounds = max_pixels_.value();
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// To avoid toggling, we allow any resolutions between
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// |target_pixel_upper_bounds| and video_stream_adapter.h's
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// GetLowerResolutionThan(). This is the pixels we end up if we adapt down
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// from |target_pixel_upper_bounds|.
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int target_pixels_lower_bounds =
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GetLowerResolutionThan(target_pixel_upper_bounds);
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if (current_pixels > target_pixel_upper_bounds) {
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listener_->OnResourceUsageStateMeasured(this,
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ResourceUsageState::kOveruse);
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} else if (current_pixels < target_pixels_lower_bounds) {
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listener_->OnResourceUsageStateMeasured(this,
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ResourceUsageState::kUnderuse);
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}
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return kResourceUsageCheckIntervalMs;
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});
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} else {
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repeating_task_.Stop();
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}
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// The task must be running if we have a listener.
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RTC_DCHECK(repeating_task_.Running() || !listener_);
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}
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} // namespace webrtc
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