Support Opus Ambisonics playback

media/renderers/audio_renderer_impl_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/renderers/audio_renderer_impl.h"
 
 #include <memory>
 #include <utility>
 #include <vector>
 
@@ skipping 661 matching lines @@
   DeliverBuffer(DecodeStatus::OK, buffer);
 
   // All channels should now be enabled.
   mask = channel_mask();
   EXPECT_FALSE(mask.empty());
   ASSERT_EQ(mask.size(), static_cast<size_t>(hw_params.channels()));
   for (int ch = 0; ch < hw_params.channels(); ++ch)
     ASSERT_TRUE(mask[ch]);
 }
 
+// Verify that the proper channel mask is configured when downmixing is applied
+// to the input with discrete layout. The default hardware layout is stereo.
+TEST_F(AudioRendererImplTest, ChannelMask_DownmixDiscreteLayout) {
+  int audio_channels = 9;
+
+  AudioDecoderConfig audio_config(
+      kCodecOpus, kSampleFormat, CHANNEL_LAYOUT_DISCRETE,
+      kInputSamplesPerSecond, EmptyExtraData(), Unencrypted());
+  audio_config.SetChannelsForDiscrete(audio_channels);
+  demuxer_stream_.set_audio_decoder_config(audio_config);
+  ConfigureDemuxerStream(true);
+
+  // Fake an attached webaudio client.
+  sink_->SetIsOptimizedForHardwareParameters(false);
+
+  Initialize();
+  std::vector<bool> mask = channel_mask();
+  EXPECT_FALSE(mask.empty());
+  ASSERT_EQ(mask.size(), static_cast<size_t>(audio_channels));
+  for (int ch = 0; ch < audio_channels; ++ch)
+    ASSERT_TRUE(mask[ch]);
+}
+
 TEST_F(AudioRendererImplTest, Underflow_Flush) {
   Initialize();
   Preroll();
   StartTicking();
 
   // Force underflow.
   EXPECT_TRUE(ConsumeBufferedData(frames_buffered()));
   WaitForPendingRead();
   EXPECT_CALL(*this, OnBufferingStateChange(BUFFERING_HAVE_NOTHING));
   EXPECT_FALSE(ConsumeBufferedData(OutputFrames(1)));
@@ skipping 402 matching lines @@
   // Advance far enough that we shouldn't be clamped to current time (tested
   // already above).
   tick_clock_->Advance(kOneSecond);
   EXPECT_EQ(
       current_time + timestamp_helper.GetFrameDuration(frames_to_consume.value),
       CurrentMediaWallClockTime(&is_time_moving));
   EXPECT_TRUE(is_time_moving);
 }
 
 }  // namespace media