Injectable audio encoders: BuiltinAudioEncoderFactory

webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.h

Index: webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.h
diff --git a/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.h b/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.h
index 3d0483b9ca5bbb12b34b40860c543bf05ccc914d..7167d1962c4ccb23d027be80eb41aed4a74c6279 100644
--- a/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.h
+++ b/webrtc/modules/audio_coding/codecs/opus/audio_encoder_opus.h
@@ -16,6 +16,7 @@
 #include <string>
 #include <vector>
 
+#include "webrtc/api/audio_codecs/audio_format.h"
 #include "webrtc/base/constructormagic.h"
 #include "webrtc/base/optional.h"
 #include "webrtc/common_audio/smoothing_filter.h"
@@ -78,6 +79,9 @@ class AudioEncoderOpus final : public AudioEncoder {
 #endif
   };
 
+  static Config CreateConfig(int payload_type, const SdpAudioFormat& format);
+  static Config CreateConfig(const CodecInst& codec_inst);
+
   using AudioNetworkAdaptorCreator =
       std::function<std::unique_ptr<AudioNetworkAdaptor>(const std::string&,
                                                          RtcEventLog*,
@@ -88,9 +92,14 @@ class AudioEncoderOpus final : public AudioEncoder {
       std::unique_ptr<SmoothingFilter> bitrate_smoother = nullptr);
 
   explicit AudioEncoderOpus(const CodecInst& codec_inst);
-
+  AudioEncoderOpus(int payload_type, const SdpAudioFormat& format);
   ~AudioEncoderOpus() override;
 
+  // Static interface for use by BuiltinAudioEncoderFactory.
+  static constexpr const char* GetPayloadName() { return "opus"; }
+  static rtc::Optional<AudioCodecInfo> QueryAudioEncoder(
+      const SdpAudioFormat& format);
+
   int SampleRateHz() const override;
   size_t NumChannels() const override;
   size_t Num10MsFramesInNextPacket() const override;