1 files changed, 49 insertions, 0 deletions
diff --git a/third_party/libwebrtc/api/audio_codecs/opus_audio_decoder_factory.cc b/third_party/libwebrtc/api/audio_codecs/opus_audio_decoder_factory.cc
new file mode 100644
index 0000000000..ed68f2584e
--- /dev/null
+++ b/third_party/libwebrtc/api/audio_codecs/opus_audio_decoder_factory.cc
@@ -0,0 +1,49 @@
+/*
+ *  Copyright (c) 2019 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "api/audio_codecs/opus_audio_decoder_factory.h"
+
+#include <memory>
+#include <vector>
+
+#include "api/audio_codecs/audio_decoder_factory_template.h"
+#include "api/audio_codecs/opus/audio_decoder_multi_channel_opus.h"
+#include "api/audio_codecs/opus/audio_decoder_opus.h"
+
+namespace webrtc {
+
+namespace {
+
+// Modify an audio decoder to not advertise support for anything.
+template <typename T>
+struct NotAdvertised {
+  using Config = typename T::Config;
+  static absl::optional<Config> SdpToConfig(
+      const SdpAudioFormat& audio_format) {
+    return T::SdpToConfig(audio_format);
+  }
+  static void AppendSupportedDecoders(std::vector<AudioCodecSpec>* specs) {
+    // Don't advertise support for anything.
+  }
+  static std::unique_ptr<AudioDecoder> MakeAudioDecoder(
+      const Config& config,
+      absl::optional<AudioCodecPairId> codec_pair_id = absl::nullopt) {
+    return T::MakeAudioDecoder(config, codec_pair_id);
+  }
+};
+
+}  // namespace
+
+rtc::scoped_refptr<AudioDecoderFactory> CreateOpusAudioDecoderFactory() {
+  return CreateAudioDecoderFactory<
+      AudioDecoderOpus, NotAdvertised<AudioDecoderMultiChannelOpus>>();
+}
+
+}  // namespace webrtc