Support Opus Ambisonics playback

media/ffmpeg/ffmpeg_common_unittest.cc

 // Copyright (c) 2011 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 <stddef.h>
 #include <stdint.h>
 
 #include <cstring>
 
 #include "base/bind.h"
@@ skipping 107 matching lines @@
     } else {
       // Only process audio/video.
       continue;
     }
   }
 
   ASSERT_TRUE(found_audio);
   ASSERT_TRUE(found_video);
 }
 
+TEST_F(FFmpegCommonTest, AVStreamToAudioDecoderConfig_OpusAmbisonics) {
+  base::MemoryMappedFile file;
+  // TODO (flim): Upload this ogg file
+  file.Initialize(GetTestDataFilePath("4ch-opus-channel-mapping-2.ogg"));
+  InMemoryUrlProtocol protocol(file.data(), file.length(), false);
+  FFmpegGlue glue(&protocol);
+  ASSERT_TRUE(glue.OpenContext());
+
+  AVFormatContext* format_context = glue.format_context();
+  EXPECT_EQ(static_cast<unsigned int>(1), format_context->nb_streams);
+  AVStream* stream = format_context->streams[0];
+
+  AVCodecParameters* codec_parameters = stream->codecpar;
+  EXPECT_EQ(AVMEDIA_TYPE_AUDIO, codec_parameters->codec_type);
+
+  AudioDecoderConfig audio_config;
+  ASSERT_TRUE(AVStreamToAudioDecoderConfig(stream, &audio_config));
+
+  EXPECT_EQ(kCodecOpus, audio_config.codec());
+  EXPECT_EQ(CHANNEL_LAYOUT_DISCRETE, audio_config.channel_layout());
+  EXPECT_EQ(4, audio_config.channels());
+}
+
 TEST_F(FFmpegCommonTest, TimeBaseConversions) {
   const int64_t test_data[][5] = {
       {1, 2, 1, 500000, 1}, {1, 3, 1, 333333, 1}, {1, 3, 2, 666667, 2},
   };
 
   for (size_t i = 0; i < arraysize(test_data); ++i) {
     SCOPED_TRACE(i);
 
     AVRational time_base;
     time_base.num = static_cast<int>(test_data[i][0]);
@@ skipping 59 matching lines @@
   // values; diff should verify.
 #if 0
   printf("<enum name=\"FFmpegCodecHashes\" type=\"int\">\n");
   for (const auto& kv : sorted_hashes)
     printf("  <int value=\"%d\" label=\"%s\"/>\n", kv.first, kv.second);
   printf("</enum>\n");
 #endif
 }
 
 }  // namespace media