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

Bug: webrtc:12338
Change-Id: I02613d9fca45d00e2477f334b7a0416e7912e26b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/227037
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34621}

modules/audio_coding/test/TestAllCodecs.cc

@@ -320,7 +320,7 @@ void TestAllCodecs::RegisterSendCodec(char side,
   // If G.722, store half the size to compensate for the timestamp bug in the
   // RFC for G.722.
   // If iSAC runs in adaptive mode, packet size in samples can change on the
-  // fly, so we exclude this test by setting |packet_size_samples_| to -1.
+  // fly, so we exclude this test by setting `packet_size_samples_` to -1.
   int clockrate_hz = sampling_freq_hz;
   size_t num_channels = 1;
   if (absl::EqualsIgnoreCase(codec_name, "G722")) {

modules/audio_coding/test/TestStereo.cc

@@ -509,8 +509,8 @@ void TestStereo::Run(TestPackStereo* channel,
   in_file_mono_->FastForward(100);
 
   while (1) {
-    // Simulate packet loss by setting |packet_loss_| to "true" in
-    // |percent_loss| percent of the loops.
+    // Simulate packet loss by setting `packet_loss_` to "true" in
+    // `percent_loss` percent of the loops.
     if (percent_loss > 0) {
       if (counter_ == floor((100 / percent_loss) + 0.5)) {
         counter_ = 0;

modules/audio_coding/test/TestVADDTX.h

@@ -23,7 +23,7 @@
 namespace webrtc {
 
 // This class records the frame type, and delegates actual sending to the
-// |next_| AudioPacketizationCallback.
+// `next_` AudioPacketizationCallback.
 class MonitoringAudioPacketizationCallback : public AudioPacketizationCallback {
  public:
   explicit MonitoringAudioPacketizationCallback(
@@ -67,9 +67,9 @@ class TestVadDtx {
   // the expectation. Saves result to a file.
   // expects[x] means
   // -1 : do not care,
-  // 0  : there have been no packets of type |x|,
-  // 1  : there have been packets of type |x|,
-  // with |x| indicates the following packet types
+  // 0  : there have been no packets of type `x`,
+  // 1  : there have been packets of type `x`,
+  // with `x` indicates the following packet types
   // 0 - kEmptyFrame
   // 1 - kAudioFrameSpeech
   // 2 - kAudioFrameCN

modules/audio_coding/test/opus_test.cc

@@ -277,8 +277,8 @@ void OpusTest::Run(TestPackStereo* channel,
         ASSERT_GE(bitstream_len_byte_int, 0);
         bitstream_len_byte = static_cast<size_t>(bitstream_len_byte_int);
 
-        // Simulate packet loss by setting |packet_loss_| to "true" in
-        // |percent_loss| percent of the loops.
+        // Simulate packet loss by setting `packet_loss_` to "true" in
+        // `percent_loss` percent of the loops.
         // TODO(tlegrand): Move handling of loss simulation to TestPackStereo.
         if (percent_loss > 0) {
           if (counter_ == floor((100 / percent_loss) + 0.5)) {