To M56: Use ffmpeg for opus decoding, no need to maintain our decoder.

media/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/buildflag_header.gni")
 import("//build/config/android/config.gni")
 import("//build/config/arm.gni")
 import("//build/config/features.gni")
 import("//build/config/linux/pkg_config.gni")
 import("//build/config/ui.gni")
@@ skipping 144 matching lines @@
     "filters/h264_bit_reader.cc",
     "filters/h264_bit_reader.h",
     "filters/h264_parser.cc",
     "filters/h264_parser.h",
     "filters/ivf_parser.cc",
     "filters/ivf_parser.h",
     "filters/jpeg_parser.cc",
     "filters/jpeg_parser.h",
     "filters/memory_data_source.cc",
     "filters/memory_data_source.h",
-    "filters/opus_audio_decoder.cc",
-    "filters/opus_audio_decoder.h",
     "filters/opus_constants.cc",
     "filters/opus_constants.h",
     "filters/pipeline_controller.cc",
     "filters/pipeline_controller.h",
     "filters/source_buffer_range.cc",
     "filters/source_buffer_range.h",
     "filters/source_buffer_state.cc",
     "filters/source_buffer_state.h",
     "filters/source_buffer_stream.cc",
     "filters/source_buffer_stream.h",
@@ skipping 99 matching lines @@
   ]
 
   public_configs = [ "//third_party/libwebm:libwebm_config" ]
   public_deps = [
     ":filters_common",
   ]
 
   include_dirs = [ "." ]
   if (media_use_ffmpeg) {
     public_deps += [ "//media/ffmpeg" ]
-    deps += [ "//third_party/ffmpeg" ]
+    deps += [
+      "//third_party/ffmpeg",
+      "//third_party/opus",
+    ]
     sources += [
       "filters/audio_file_reader.cc",
       "filters/audio_file_reader.h",
       "filters/blocking_url_protocol.cc",
       "filters/ffmpeg_audio_decoder.cc",
       "filters/ffmpeg_audio_decoder.h",
       "filters/ffmpeg_bitstream_converter.h",
       "filters/ffmpeg_demuxer.cc",
       "filters/ffmpeg_demuxer.h",
       "filters/ffmpeg_glue.cc",
@@ skipping 182 matching lines @@
       "device_monitors/device_monitor_udev.cc",
       "device_monitors/device_monitor_udev.h",
     ]
   }
 
   public_deps += [
     ":media_features",
     ":shared_memory_support",
     "//media/audio",
     "//media/base",
-    "//third_party/opus",
   ]
 
   deps += [
     "//base",
     "//base:i18n",
     "//base/third_party/dynamic_annotations",
     "//crypto",
     "//crypto:platform",
     "//gpu/command_buffer/client:gles2_interface",
     "//gpu/command_buffer/common",
@@ skipping 429 matching lines @@
   fuzzer_test("media_mp4_avcc_parser_fuzzer") {
     sources = [
       "formats/mp4/mp4_avcc_parser_fuzzer.cc",
     ]
     deps = [
       ":media",
       "//base",
     ]
   }
 }