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116 lines
4 KiB
C++
116 lines
4 KiB
C++
/*
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* Copyright (c) 2012 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 "common_video/video_render_frames.h"
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#include <type_traits>
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#include <utility>
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#include "rtc_base/checks.h"
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#include "rtc_base/logging.h"
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#include "rtc_base/time_utils.h"
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#include "system_wrappers/include/metrics.h"
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namespace webrtc {
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namespace {
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// Don't render frames with timestamp older than 500ms from now.
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const int kOldRenderTimestampMS = 500;
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// Don't render frames with timestamp more than 10s into the future.
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const int kFutureRenderTimestampMS = 10000;
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const uint32_t kEventMaxWaitTimeMs = 200;
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const uint32_t kMinRenderDelayMs = 10;
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const uint32_t kMaxRenderDelayMs = 500;
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const size_t kMaxIncomingFramesBeforeLogged = 100;
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uint32_t EnsureValidRenderDelay(uint32_t render_delay) {
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return (render_delay < kMinRenderDelayMs || render_delay > kMaxRenderDelayMs)
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? kMinRenderDelayMs
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: render_delay;
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}
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} // namespace
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VideoRenderFrames::VideoRenderFrames(uint32_t render_delay_ms)
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: render_delay_ms_(EnsureValidRenderDelay(render_delay_ms)) {}
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VideoRenderFrames::~VideoRenderFrames() {
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frames_dropped_ += incoming_frames_.size();
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RTC_HISTOGRAM_COUNTS_1000("WebRTC.Video.DroppedFrames.RenderQueue",
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frames_dropped_);
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RTC_LOG(LS_INFO) << "WebRTC.Video.DroppedFrames.RenderQueue "
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<< frames_dropped_;
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}
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int32_t VideoRenderFrames::AddFrame(VideoFrame&& new_frame) {
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const int64_t time_now = rtc::TimeMillis();
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// Drop old frames only when there are other frames in the queue, otherwise, a
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// really slow system never renders any frames.
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if (!incoming_frames_.empty() &&
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new_frame.render_time_ms() + kOldRenderTimestampMS < time_now) {
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RTC_LOG(LS_WARNING) << "Too old frame, timestamp=" << new_frame.timestamp();
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++frames_dropped_;
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return -1;
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}
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if (new_frame.render_time_ms() > time_now + kFutureRenderTimestampMS) {
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RTC_LOG(LS_WARNING) << "Frame too long into the future, timestamp="
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<< new_frame.timestamp();
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++frames_dropped_;
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return -1;
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}
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if (new_frame.render_time_ms() < last_render_time_ms_) {
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RTC_LOG(LS_WARNING) << "Frame scheduled out of order, render_time="
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<< new_frame.render_time_ms()
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<< ", latest=" << last_render_time_ms_;
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// For more details, see bug:
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// https://bugs.chromium.org/p/webrtc/issues/detail?id=7253
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++frames_dropped_;
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return -1;
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}
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last_render_time_ms_ = new_frame.render_time_ms();
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incoming_frames_.emplace_back(std::move(new_frame));
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if (incoming_frames_.size() > kMaxIncomingFramesBeforeLogged) {
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RTC_LOG(LS_WARNING) << "Stored incoming frames: "
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<< incoming_frames_.size();
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}
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return static_cast<int32_t>(incoming_frames_.size());
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}
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absl::optional<VideoFrame> VideoRenderFrames::FrameToRender() {
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absl::optional<VideoFrame> render_frame;
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// Get the newest frame that can be released for rendering.
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while (!incoming_frames_.empty() && TimeToNextFrameRelease() <= 0) {
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if (render_frame) {
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++frames_dropped_;
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}
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render_frame = std::move(incoming_frames_.front());
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incoming_frames_.pop_front();
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}
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return render_frame;
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}
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uint32_t VideoRenderFrames::TimeToNextFrameRelease() {
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if (incoming_frames_.empty()) {
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return kEventMaxWaitTimeMs;
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}
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const int64_t time_to_release = incoming_frames_.front().render_time_ms() -
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render_delay_ms_ - rtc::TimeMillis();
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return time_to_release < 0 ? 0u : static_cast<uint32_t>(time_to_release);
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}
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bool VideoRenderFrames::HasPendingFrames() const {
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return !incoming_frames_.empty();
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}
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} // namespace webrtc
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