Adding 120 ms frame length support in NetEq.

BUG=webrtc:1015

Review-Url: https://codereview.webrtc.org/1901633002
Cr-Commit-Position: refs/heads/master@{#12592}

webrtc/modules/audio_coding/neteq/normal_unittest.cc

@@ -27,9 +27,20 @@
 #include "webrtc/modules/audio_coding/neteq/sync_buffer.h"
 
 using ::testing::_;
+using ::testing::Invoke;
 
 namespace webrtc {
 
+namespace {
+
+int ExpandProcess120ms(AudioMultiVector* output) {
+  AudioMultiVector dummy_audio(1, 11520u);
+  dummy_audio.CopyTo(output);
+  return 0;
+}
+
+} // namespace
+
 TEST(Normal, CreateAndDestroy) {
   MockDecoderDatabase db;
   int fs = 8000;
@@ -121,6 +132,45 @@ TEST(Normal, InputLengthAndChannelsDoNotMatch) {
   EXPECT_CALL(expand, Die());  // Called when |expand| goes out of scope.
 }
 
+TEST(Normal, LastModeExpand120msPacket) {
+  WebRtcSpl_Init();
+  MockDecoderDatabase db;
+  const int kFs = 48000;
+  const size_t kPacketsizeBytes = 11520u;
+  const size_t kChannels = 1;
+  BackgroundNoise bgn(kChannels);
+  SyncBuffer sync_buffer(kChannels, 1000);
+  RandomVector random_vector;
+  StatisticsCalculator statistics;
+  MockExpand expand(&bgn, &sync_buffer, &random_vector, &statistics, kFs,
+                    kChannels);
+  Normal normal(kFs, &db, bgn, &expand);
+
+  int16_t input[kPacketsizeBytes] = {0};
+
+  std::unique_ptr<int16_t[]> mute_factor_array(new int16_t[kChannels]);
+  for (size_t i = 0; i < kChannels; ++i) {
+    mute_factor_array[i] = 16384;
+  }
+
+  AudioMultiVector output(kChannels);
+
+  EXPECT_CALL(expand, SetParametersForNormalAfterExpand());
+  EXPECT_CALL(expand, Process(_)).WillOnce(Invoke(ExpandProcess120ms));
+  EXPECT_CALL(expand, Reset());
+  EXPECT_EQ(static_cast<int>(kPacketsizeBytes),
+            normal.Process(input,
+                           kPacketsizeBytes,
+                           kModeExpand,
+                           mute_factor_array.get(),
+                           &output));
+
+  EXPECT_EQ(kPacketsizeBytes, output.Size());
+
+  EXPECT_CALL(db, Die());      // Called when |db| goes out of scope.
+  EXPECT_CALL(expand, Die());  // Called when |expand| goes out of scope.
+}
+
 // TODO(hlundin): Write more tests.
 
 }  // namespace webrtc