Use backticks not vertical bars to denote variables in comments for /api

Bug: webrtc:12338
Change-Id: Ib97b2c3d64dbd895f261ffa76a2e885bd934a87f
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/226940
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34554}
diff --git a/api/video_codecs/test/video_decoder_software_fallback_wrapper_unittest.cc b/api/video_codecs/test/video_decoder_software_fallback_wrapper_unittest.cc
index 30d5287..89298d0 100644
--- a/api/video_codecs/test/video_decoder_software_fallback_wrapper_unittest.cc
+++ b/api/video_codecs/test/video_decoder_software_fallback_wrapper_unittest.cc
@@ -75,7 +75,7 @@
     int reset_count_ = 0;
   };
   test::ScopedFieldTrials override_field_trials_;
-  // |fake_decoder_| is owned and released by |fallback_wrapper_|.
+  // `fake_decoder_` is owned and released by `fallback_wrapper_`.
   CountingFakeDecoder* fake_decoder_;
   std::unique_ptr<VideoDecoder> fallback_wrapper_;
 };
diff --git a/api/video_codecs/test/video_encoder_software_fallback_wrapper_unittest.cc b/api/video_codecs/test/video_encoder_software_fallback_wrapper_unittest.cc
index 2d8b002..84229dd 100644
--- a/api/video_codecs/test/video_encoder_software_fallback_wrapper_unittest.cc
+++ b/api/video_codecs/test/video_encoder_software_fallback_wrapper_unittest.cc
@@ -172,7 +172,7 @@
 
   test::ScopedFieldTrials override_field_trials_;
   FakeEncodedImageCallback callback_;
-  // |fake_encoder_| is owned and released by |fallback_wrapper_|.
+  // `fake_encoder_` is owned and released by `fallback_wrapper_`.
   CountingFakeEncoder* fake_encoder_;
   CountingFakeEncoder* fake_sw_encoder_;
   bool wrapper_initialized_;
diff --git a/api/video_codecs/video_decoder_factory.h b/api/video_codecs/video_decoder_factory.h
index 0b6ea4f..ef90809 100644
--- a/api/video_codecs/video_decoder_factory.h
+++ b/api/video_codecs/video_decoder_factory.h
@@ -40,7 +40,7 @@
   // power efficient, which is currently interpreted as if there is support for
   // hardware acceleration.
   // See https://w3c.github.io/webrtc-svc/#scalabilitymodes* for a specification
-  // of valid values for |scalability_mode|.
+  // of valid values for `scalability_mode`.
   // NOTE: QueryCodecSupport is currently an experimental feature that is
   // subject to change without notice.
   virtual CodecSupport QueryCodecSupport(
diff --git a/api/video_codecs/video_encoder.h b/api/video_codecs/video_encoder.h
index caf0697..8191f47 100644
--- a/api/video_codecs/video_encoder.h
+++ b/api/video_codecs/video_encoder.h
@@ -167,7 +167,7 @@
     ScalingSettings scaling_settings;
 
     // The width and height of the incoming video frames should be divisible
-    // by |requested_resolution_alignment|. If they are not, the encoder may
+    // by `requested_resolution_alignment`. If they are not, the encoder may
     // drop the incoming frame.
     // For example: With I420, this value would be a multiple of 2.
     // Note that this field is unrelated to any horizontal or vertical stride
@@ -175,12 +175,12 @@
     int requested_resolution_alignment;
 
     // Same as above but if true, each simulcast layer should also be divisible
-    // by |requested_resolution_alignment|.
-    // Note that scale factors |scale_resolution_down_by| may be adjusted so a
+    // by `requested_resolution_alignment`.
+    // Note that scale factors `scale_resolution_down_by` may be adjusted so a
     // common multiple is not too large to avoid largely cropped frames and
     // possibly with an aspect ratio far from the original.
     // Warning: large values of scale_resolution_down_by could be changed
-    // considerably, especially if |requested_resolution_alignment| is large.
+    // considerably, especially if `requested_resolution_alignment` is large.
     bool apply_alignment_to_all_simulcast_layers;
 
     // If true, encoder supports working with a native handle (e.g. texture
@@ -215,7 +215,7 @@
     bool has_internal_source;
 
     // For each spatial layer (simulcast stream or SVC layer), represented as an
-    // element in |fps_allocation| a vector indicates how many temporal layers
+    // element in `fps_allocation` a vector indicates how many temporal layers
     // the encoder is using for that spatial layer.
     // For each spatial/temporal layer pair, the frame rate fraction is given as
     // an 8bit unsigned integer where 0 = 0% and 255 = 100%.
@@ -243,8 +243,8 @@
     // Recommended bitrate limits for different resolutions.
     std::vector<ResolutionBitrateLimits> resolution_bitrate_limits;
 
-    // Obtains the limits from |resolution_bitrate_limits| that best matches the
-    // |frame_size_pixels|.
+    // Obtains the limits from `resolution_bitrate_limits` that best matches the
+    // `frame_size_pixels`.
     absl::optional<ResolutionBitrateLimits>
     GetEncoderBitrateLimitsForResolution(int frame_size_pixels) const;
 
@@ -279,7 +279,7 @@
     VideoBitrateAllocation bitrate;
     // Target framerate, in fps. A value <= 0.0 is invalid and should be
     // interpreted as framerate target not available. In this case the encoder
-    // should fall back to the max framerate specified in |codec_settings| of
+    // should fall back to the max framerate specified in `codec_settings` of
     // the last InitEncode() call.
     double framerate_fps;
     // The network bandwidth available for video. This is at least
@@ -299,15 +299,15 @@
     uint32_t timestamp_of_last_received;
     // Describes whether the dependencies of the last received frame were
     // all decodable.
-    // |false| if some dependencies were undecodable, |true| if all dependencies
-    // were decodable, and |nullopt| if the dependencies are unknown.
+    // `false` if some dependencies were undecodable, `true` if all dependencies
+    // were decodable, and `nullopt` if the dependencies are unknown.
     absl::optional<bool> dependencies_of_last_received_decodable;
     // Describes whether the received frame was decodable.
-    // |false| if some dependency was undecodable or if some packet belonging
+    // `false` if some dependency was undecodable or if some packet belonging
     // to the last received frame was missed.
-    // |true| if all dependencies were decodable and all packets belonging
+    // `true` if all dependencies were decodable and all packets belonging
     // to the last received frame were received.
-    // |nullopt| if no packet belonging to the last frame was missed, but the
+    // `nullopt` if no packet belonging to the last frame was missed, but the
     // last packet in the frame was not yet received.
     absl::optional<bool> last_received_decodable;
   };
diff --git a/api/video_codecs/video_encoder_config.h b/api/video_codecs/video_encoder_config.h
index 5916374..5440f1f 100644
--- a/api/video_codecs/video_encoder_config.h
+++ b/api/video_codecs/video_encoder_config.h
@@ -24,7 +24,7 @@
 
 namespace webrtc {
 
-// The |VideoStream| struct describes a simulcast layer, or "stream".
+// The `VideoStream` struct describes a simulcast layer, or "stream".
 struct VideoStream {
   VideoStream();
   ~VideoStream();
@@ -46,7 +46,7 @@
   int max_bitrate_bps;
 
   // Scaling factor applied to the stream size.
-  // |width| and |height| values are already scaled down.
+  // `width` and `height` values are already scaled down.
   double scale_resolution_down_by;
 
   // Maximum Quantization Parameter to use when encoding the stream.
@@ -171,7 +171,7 @@
   // The simulcast layer's configurations set by the application for this video
   // sender. These are modified by the video_stream_factory before being passed
   // down to lower layers for the video encoding.
-  // |simulcast_layers| is also used for configuring non-simulcast (when there
+  // `simulcast_layers` is also used for configuring non-simulcast (when there
   // is a single VideoStream).
   std::vector<VideoStream> simulcast_layers;
 
diff --git a/api/video_codecs/video_encoder_factory.h b/api/video_codecs/video_encoder_factory.h
index c2d66cf..2768079 100644
--- a/api/video_codecs/video_encoder_factory.h
+++ b/api/video_codecs/video_encoder_factory.h
@@ -29,7 +29,7 @@
  public:
   // TODO(magjed): Try to get rid of this struct.
   struct CodecInfo {
-    // |has_internal_source| is true if encoders created by this factory of the
+    // `has_internal_source` is true if encoders created by this factory of the
     // given codec will use internal camera sources, meaning that they don't
     // require/expect frames to be delivered via webrtc::VideoEncoder::Encode.
     // This flag is used as the internal_source parameter to
@@ -88,7 +88,7 @@
   // power efficient, which is currently interpreted as if there is support for
   // hardware acceleration.
   // See https://w3c.github.io/webrtc-svc/#scalabilitymodes* for a specification
-  // of valid values for |scalability_mode|.
+  // of valid values for `scalability_mode`.
   // NOTE: QueryCodecSupport is currently an experimental feature that is
   // subject to change without notice.
   virtual CodecSupport QueryCodecSupport(
diff --git a/api/video_codecs/video_encoder_software_fallback_wrapper.cc b/api/video_codecs/video_encoder_software_fallback_wrapper.cc
index bcce9dc..e95c088 100644
--- a/api/video_codecs/video_encoder_software_fallback_wrapper.cc
+++ b/api/video_codecs/video_encoder_software_fallback_wrapper.cc
@@ -39,8 +39,8 @@
 // If forced fallback is allowed, either:
 //
 // 1) The forced fallback is requested if the resolution is less than or equal
-//    to |max_pixels_|. The resolution is allowed to be scaled down to
-//    |min_pixels_|.
+//    to `max_pixels_`. The resolution is allowed to be scaled down to
+//    `min_pixels_`.
 //
 // 2) The forced fallback is requested if temporal support is preferred and the
 //    SW fallback supports temporal layers while the HW encoder does not.
@@ -274,8 +274,8 @@
 void VideoEncoderSoftwareFallbackWrapper::SetFecControllerOverride(
     FecControllerOverride* fec_controller_override) {
   // It is important that only one of those would ever interact with the
-  // |fec_controller_override| at a given time. This is the responsibility
-  // of |this| to maintain.
+  // `fec_controller_override` at a given time. This is the responsibility
+  // of `this` to maintain.
 
   fec_controller_override_ = fec_controller_override;
   current_encoder()->SetFecControllerOverride(fec_controller_override);
diff --git a/api/video_codecs/video_encoder_software_fallback_wrapper.h b/api/video_codecs/video_encoder_software_fallback_wrapper.h
index 5282dcb..6e6902e 100644
--- a/api/video_codecs/video_encoder_software_fallback_wrapper.h
+++ b/api/video_codecs/video_encoder_software_fallback_wrapper.h
@@ -32,7 +32,7 @@
     bool prefer_temporal_support);
 
 // Default fallback for call-sites not yet updated with
-// |prefer_temporal_support|.
+// `prefer_temporal_support`.
 // TODO(sprang): Remove when usage is gone.
 RTC_EXPORT inline std::unique_ptr<VideoEncoder>
 CreateVideoEncoderSoftwareFallbackWrapper(
diff --git a/api/video_codecs/vp8_frame_buffer_controller.h b/api/video_codecs/vp8_frame_buffer_controller.h
index d3f6bc4..852008f 100644
--- a/api/video_codecs/vp8_frame_buffer_controller.h
+++ b/api/video_codecs/vp8_frame_buffer_controller.h
@@ -66,7 +66,7 @@
     // Number of active temporal layers. Set to 0 if not used.
     uint32_t ts_number_layers;
 
-    // Arrays of length |ts_number_layers|, indicating (cumulative) target
+    // Arrays of length `ts_number_layers`, indicating (cumulative) target
     // bitrate and rate decimator (e.g. 4 if every 4th frame is in the given
     // layer) for each active temporal layer, starting with temporal id 0.
     std::array<uint32_t, kMaxLayers> ts_target_bitrate;
@@ -75,7 +75,7 @@
     // The periodicity of the temporal pattern. Set to 0 if not used.
     uint32_t ts_periodicity;
 
-    // Array of length |ts_periodicity| indicating the sequence of temporal id's
+    // Array of length `ts_periodicity` indicating the sequence of temporal id's
     // to assign to incoming frames.
     std::array<uint32_t, kMaxPeriodicity> ts_layer_id;
   };
@@ -106,7 +106,7 @@
   // The limits are suggestion-only; the controller is allowed to exceed them.
   virtual void SetQpLimits(size_t stream_index, int min_qp, int max_qp) = 0;
 
-  // Number of streamed controlled by |this|.
+  // Number of streamed controlled by `this`.
   virtual size_t StreamCount() const = 0;
 
   // If this method returns true, the encoder is free to drop frames for
@@ -121,7 +121,7 @@
   virtual bool SupportsEncoderFrameDropping(size_t stream_index) const = 0;
 
   // New target bitrate for a stream (each entry in
-  // |bitrates_bps| is for another temporal layer).
+  // `bitrates_bps` is for another temporal layer).
   virtual void OnRatesUpdated(size_t stream_index,
                               const std::vector<uint32_t>& bitrates_bps,
                               int framerate_fps) = 0;
@@ -130,7 +130,7 @@
   // the controller wishes to enact in the encoder's configuration.
   // If a value is not overridden, previous overrides are still in effect.
   // However, if |Vp8EncoderConfig::reset_previous_configuration_overrides|
-  // is set to |true|, all previous overrides are reset.
+  // is set to `true`, all previous overrides are reset.
   virtual Vp8EncoderConfig UpdateConfiguration(size_t stream_index) = 0;
 
   // Returns the recommended VP8 encode flags needed.
@@ -142,13 +142,13 @@
   virtual Vp8FrameConfig NextFrameConfig(size_t stream_index,
                                          uint32_t rtp_timestamp) = 0;
 
-  // Called after the encode step is done. |rtp_timestamp| must match the
+  // Called after the encode step is done. `rtp_timestamp` must match the
   // parameter use in the NextFrameConfig() call.
-  // |is_keyframe| must be true iff the encoder decided to encode this frame as
+  // `is_keyframe` must be true iff the encoder decided to encode this frame as
   // a keyframe.
-  // If |info| is not null, the encoder may update |info| with codec specific
-  // data such as temporal id. |qp| should indicate the frame-level QP this
-  // frame was encoded at. If the encoder does not support extracting this, |qp|
+  // If `info` is not null, the encoder may update `info` with codec specific
+  // data such as temporal id. `qp` should indicate the frame-level QP this
+  // frame was encoded at. If the encoder does not support extracting this, `qp`
   // should be set to 0.
   virtual void OnEncodeDone(size_t stream_index,
                             uint32_t rtp_timestamp,
@@ -161,7 +161,7 @@
   virtual void OnFrameDropped(size_t stream_index, uint32_t rtp_timestamp) = 0;
 
   // Called by the encoder when the packet loss rate changes.
-  // |packet_loss_rate| runs between 0.0 (no loss) and 1.0 (everything lost).
+  // `packet_loss_rate` runs between 0.0 (no loss) and 1.0 (everything lost).
   virtual void OnPacketLossRateUpdate(float packet_loss_rate) = 0;
 
   // Called by the encoder when the round trip time changes.