Add frame_helpers

A number of utility functions to be shared between frame buffer 2
and the new frame scheduling implementation based on frame buffer 3.

Change-Id: Icc932c6c76fddeeedc8aa64ec27c7e0c955abfd0
Bug: webrtc:13343
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/241604
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Evan Shrubsole <eshr@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#35743}

modules/video_coding/BUILD.gn

@@ -148,6 +148,18 @@ rtc_library("h264_packet_buffer") {
   absl_deps = [ "//third_party/abseil-cpp/absl/types:optional" ]
 }
 
+rtc_library("frame_helpers") {
+  sources = [
+    "frame_helpers.cc",
+    "frame_helpers.h",
+  ]
+  deps = [
+    "../../api/video:encoded_frame",
+    "../../rtc_base:logging",
+  ]
+  absl_deps = [ "//third_party/abseil-cpp/absl/container:inlined_vector" ]
+}
+
 rtc_library("frame_buffer") {
   sources = [
     "frame_buffer3.cc",
@@ -227,6 +239,7 @@ rtc_library("video_coding") {
     ":codec_globals_headers",
     ":encoded_frame",
     ":frame_buffer",
+    ":frame_helpers",
     ":packet_buffer",
     ":video_codec_interface",
     ":video_coding_utility",

modules/video_coding/frame_buffer2.cc

@@ -18,8 +18,10 @@
 #include <utility>
 #include <vector>
 
+#include "absl/container/inlined_vector.h"
 #include "api/video/encoded_image.h"
 #include "api/video/video_timing.h"
+#include "modules/video_coding/frame_helpers.h"
 #include "modules/video_coding/include/video_coding_defines.h"
 #include "modules/video_coding/jitter_estimator.h"
 #include "modules/video_coding/timing.h"
@@ -250,7 +252,8 @@ std::unique_ptr<EncodedFrame> FrameBuffer::GetNextFrame() {
   int64_t render_time_ms = first_frame.RenderTime();
   int64_t receive_time_ms = first_frame.ReceivedTime();
   // Gracefully handle bad RTP timestamps and render time issues.
-  if (HasBadRenderTiming(first_frame, now_ms)) {
+  if (FrameHasBadRenderTiming(first_frame.RenderTimeMs(), now_ms,
+                              timing_->TargetVideoDelay())) {
     jitter_estimator_.Reset();
     timing_->Reset();
     render_time_ms = timing_->RenderTimeMs(first_frame.Timestamp(), now_ms);
@@ -318,35 +321,6 @@ std::unique_ptr<EncodedFrame> FrameBuffer::GetNextFrame() {
   }
 }
 
-bool FrameBuffer::HasBadRenderTiming(const EncodedFrame& frame,
-                                     int64_t now_ms) {
-  // Assume that render timing errors are due to changes in the video stream.
-  int64_t render_time_ms = frame.RenderTimeMs();
-  // Zero render time means render immediately.
-  if (render_time_ms == 0) {
-    return false;
-  }
-  if (render_time_ms < 0) {
-    return true;
-  }
-  const int64_t kMaxVideoDelayMs = 10000;
-  if (std::abs(render_time_ms - now_ms) > kMaxVideoDelayMs) {
-    int frame_delay = static_cast<int>(std::abs(render_time_ms - now_ms));
-    RTC_LOG(LS_WARNING)
-        << "A frame about to be decoded is out of the configured "
-           "delay bounds ("
-        << frame_delay << " > " << kMaxVideoDelayMs
-        << "). Resetting the video jitter buffer.";
-    return true;
-  }
-  if (static_cast<int>(timing_->TargetVideoDelay()) > kMaxVideoDelayMs) {
-    RTC_LOG(LS_WARNING) << "The video target delay has grown larger than "
-                        << kMaxVideoDelayMs << " ms.";
-    return true;
-  }
-  return false;
-}
-
 void FrameBuffer::SetProtectionMode(VCMVideoProtection mode) {
   TRACE_EVENT0("webrtc", "FrameBuffer::SetProtectionMode");
   MutexLock lock(&mutex_);
@@ -660,39 +634,11 @@ void FrameBuffer::ClearFramesAndHistory() {
 std::unique_ptr<EncodedFrame> FrameBuffer::CombineAndDeleteFrames(
     std::vector<std::unique_ptr<EncodedFrame>> frames) const {
   RTC_DCHECK(!frames.empty());
-  size_t total_length = 0;
-  for (const auto& frame : frames) {
-    total_length += frame->size();
+  absl::InlinedVector<std::unique_ptr<EncodedFrame>, 4> inlined;
+  for (auto& frame : frames) {
+    inlined.push_back(std::move(frame));
   }
-  const EncodedFrame& last_frame = *frames.back();
-  std::unique_ptr<EncodedFrame> first_frame = std::move(frames[0]);
-  auto encoded_image_buffer = EncodedImageBuffer::Create(total_length);
-  uint8_t* buffer = encoded_image_buffer->data();
-  first_frame->SetSpatialLayerFrameSize(first_frame->SpatialIndex().value_or(0),
-                                        first_frame->size());
-  memcpy(buffer, first_frame->data(), first_frame->size());
-  buffer += first_frame->size();
-
-  // Spatial index of combined frame is set equal to spatial index of its top
-  // spatial layer.
-  first_frame->SetSpatialIndex(last_frame.SpatialIndex().value_or(0));
-
-  first_frame->video_timing_mutable()->network2_timestamp_ms =
-      last_frame.video_timing().network2_timestamp_ms;
-  first_frame->video_timing_mutable()->receive_finish_ms =
-      last_frame.video_timing().receive_finish_ms;
-
-  // Append all remaining frames to the first one.
-  for (size_t i = 1; i < frames.size(); ++i) {
-    // Let |next_frame| fall out of scope so it is deleted after copying.
-    std::unique_ptr<EncodedFrame> next_frame = std::move(frames[i]);
-    first_frame->SetSpatialLayerFrameSize(
-        next_frame->SpatialIndex().value_or(0), next_frame->size());
-    memcpy(buffer, next_frame->data(), next_frame->size());
-    buffer += next_frame->size();
-  }
-  first_frame->SetEncodedData(encoded_image_buffer);
-  return first_frame;
+  return webrtc::CombineAndDeleteFrames(std::move(inlined));
 }
 
 FrameBuffer::FrameInfo::FrameInfo() = default;

modules/video_coding/frame_buffer2.h

@@ -147,9 +147,6 @@ class FrameBuffer {
 
   void ClearFramesAndHistory() RTC_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
 
-  bool HasBadRenderTiming(const EncodedFrame& frame, int64_t now_ms)
-      RTC_EXCLUSIVE_LOCKS_REQUIRED(mutex_);
-
   // The cleaner solution would be to have the NextFrame function return a
   // vector of frames, but until the decoding pipeline can support decoding
   // multiple frames at the same time we combine all frames to one frame and

modules/video_coding/frame_helpers.cc

@@ -0,0 +1,90 @@
+/*
+ *  Copyright (c) 2021 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 "modules/video_coding/frame_helpers.h"
+
+#include <utility>
+
+#include "rtc_base/logging.h"
+
+namespace webrtc {
+
+bool FrameHasBadRenderTiming(int64_t render_time_ms,
+                             int64_t now_ms,
+                             int target_video_delay) {
+  // Zero render time means render immediately.
+  if (render_time_ms == 0) {
+    return false;
+  }
+  if (render_time_ms < 0) {
+    return true;
+  }
+  const int64_t kMaxVideoDelayMs = 10000;
+  if (std::abs(render_time_ms - now_ms) > kMaxVideoDelayMs) {
+    int frame_delay = static_cast<int>(std::abs(render_time_ms - now_ms));
+    RTC_LOG(LS_WARNING)
+        << "A frame about to be decoded is out of the configured "
+           "delay bounds ("
+        << frame_delay << " > " << kMaxVideoDelayMs
+        << "). Resetting the video jitter buffer.";
+    return true;
+  }
+  if (target_video_delay > kMaxVideoDelayMs) {
+    RTC_LOG(LS_WARNING) << "The video target delay has grown larger than "
+                        << kMaxVideoDelayMs << " ms.";
+    return true;
+  }
+  return false;
+}
+
+std::unique_ptr<EncodedFrame> CombineAndDeleteFrames(
+    absl::InlinedVector<std::unique_ptr<EncodedFrame>, 4> frames) {
+  RTC_DCHECK(!frames.empty());
+
+  if (frames.size() == 1) {
+    return std::move(frames[0]);
+  }
+
+  size_t total_length = 0;
+  for (const auto& frame : frames) {
+    total_length += frame->size();
+  }
+  const EncodedFrame& last_frame = *frames.back();
+  std::unique_ptr<EncodedFrame> first_frame = std::move(frames[0]);
+  auto encoded_image_buffer = EncodedImageBuffer::Create(total_length);
+  uint8_t* buffer = encoded_image_buffer->data();
+  first_frame->SetSpatialLayerFrameSize(first_frame->SpatialIndex().value_or(0),
+                                        first_frame->size());
+  memcpy(buffer, first_frame->data(), first_frame->size());
+  buffer += first_frame->size();
+
+  // Spatial index of combined frame is set equal to spatial index of its top
+  // spatial layer.
+  first_frame->SetSpatialIndex(last_frame.SpatialIndex().value_or(0));
+
+  first_frame->video_timing_mutable()->network2_timestamp_ms =
+      last_frame.video_timing().network2_timestamp_ms;
+  first_frame->video_timing_mutable()->receive_finish_ms =
+      last_frame.video_timing().receive_finish_ms;
+
+  // Append all remaining frames to the first one.
+  for (size_t i = 1; i < frames.size(); ++i) {
+    // Let |next_frame| fall out of scope so it is deleted after copying.
+    std::unique_ptr<EncodedFrame> next_frame = std::move(frames[i]);
+    first_frame->SetSpatialLayerFrameSize(
+        next_frame->SpatialIndex().value_or(0), next_frame->size());
+    memcpy(buffer, next_frame->data(), next_frame->size());
+    buffer += next_frame->size();
+  }
+  first_frame->SetEncodedData(encoded_image_buffer);
+  return first_frame;
+}
+
+}  // namespace webrtc

modules/video_coding/frame_helpers.h

@@ -0,0 +1,31 @@
+/*
+ *  Copyright (c) 2021 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.
+ */
+
+#ifndef MODULES_VIDEO_CODING_FRAME_HELPERS_H_
+#define MODULES_VIDEO_CODING_FRAME_HELPERS_H_
+
+#include <memory>
+
+#include "absl/container/inlined_vector.h"
+#include "api/video/encoded_frame.h"
+
+namespace webrtc {
+
+// TODO(https://bugs.webrtc.org/13589): Switch to using Timestamp and TimeDelta.
+bool FrameHasBadRenderTiming(int64_t render_time_ms,
+                             int64_t now_ms,
+                             int target_video_delay);
+
+std::unique_ptr<EncodedFrame> CombineAndDeleteFrames(
+    absl::InlinedVector<std::unique_ptr<EncodedFrame>, 4> frames);
+
+}  // namespace webrtc
+
+#endif  // MODULES_VIDEO_CODING_FRAME_HELPERS_H_