[EXPERIMENTAL] Generic stereo codec with index header sending merged frames

webrtc/media/engine/webrtcvideoengine.h

Index: webrtc/media/engine/webrtcvideoengine.h
diff --git a/webrtc/media/engine/webrtcvideoengine.h b/webrtc/media/engine/webrtcvideoengine.h
index 0d51aa758fb7e7d412301b6542615a08f48edba3..184ab2076af2f814d39470f68d684efb89f62a5d 100644
--- a/webrtc/media/engine/webrtcvideoengine.h
+++ b/webrtc/media/engine/webrtcvideoengine.h
@@ -205,6 +205,7 @@ class WebRtcVideoChannel : public VideoMediaChannel, public webrtc::Transport {
                                           const VideoCodecSettings& b);
 
     VideoCodec codec;
+    rtc::Optional<VideoCodec> stereo_codec;
     webrtc::UlpfecConfig ulpfec;
     int flexfec_payload_type;
     int rtx_payload_type;
@@ -328,6 +329,7 @@ class WebRtcVideoChannel : public VideoMediaChannel, public webrtc::Transport {
     // matches.
     AllocatedEncoder CreateVideoEncoder(const VideoCodec& codec,
                                         bool force_encoder_allocation);
+    AllocatedEncoder CreateStereoVideoEncoder(const VideoCodec& codec);
     void DestroyVideoEncoder(AllocatedEncoder* encoder);
     void SetCodec(const VideoCodecSettings& codec,
                   bool force_encoder_allocation);
@@ -357,6 +359,8 @@ class WebRtcVideoChannel : public VideoMediaChannel, public webrtc::Transport {
         ACCESS_ON(&thread_checker_);
     const std::unique_ptr<WebRtcVideoEncoderFactory> internal_encoder_factory_
         ACCESS_ON(&thread_checker_);
+    std::unique_ptr<WebRtcVideoEncoderFactory> stereo_encoder_factory_
+        ACCESS_ON(&thread_checker_);
 
     webrtc::VideoSendStream* stream_ ACCESS_ON(&thread_checker_);
     rtc::VideoSinkInterface<webrtc::VideoFrame>* encoder_sink_
@@ -430,6 +434,7 @@ class WebRtcVideoChannel : public VideoMediaChannel, public webrtc::Transport {
     AllocatedDecoder CreateOrReuseVideoDecoder(
         std::vector<AllocatedDecoder>* old_decoder,
         const VideoCodec& codec);
+    AllocatedDecoder CreateStereoVideoDecoder(const VideoCodec& codec);
     void ClearDecoders(std::vector<AllocatedDecoder>* allocated_decoders);
 
     std::string GetCodecNameFromPayloadType(int payload_type);
@@ -447,6 +452,8 @@ class WebRtcVideoChannel : public VideoMediaChannel, public webrtc::Transport {
     webrtc::FlexfecReceiveStream* flexfec_stream_;
 
     WebRtcVideoDecoderFactory* const external_decoder_factory_;
+    const std::unique_ptr<WebRtcVideoDecoderFactory> internal_decoder_factory_;
+    std::unique_ptr<WebRtcVideoDecoderFactory> stereo_decoder_factory_;
     std::vector<AllocatedDecoder> allocated_decoders_;
 
     rtc::CriticalSection sink_lock_;
@@ -475,6 +482,9 @@ class WebRtcVideoChannel : public VideoMediaChannel, public webrtc::Transport {
   // codec that is supported locally will be selected.
   rtc::Optional<VideoCodecSettings> SelectSendVideoCodec(
       const std::vector<VideoCodecSettings>& remote_mapped_codecs) const;
+  rtc::Optional<WebRtcVideoChannel::VideoCodecSettings>
+  SelectStereoAssociatedVideoCodec(
+      const std::vector<VideoCodecSettings>& remote_mapped_codecs) const;
 
   static bool NonFlexfecReceiveCodecsHaveChanged(
       std::vector<VideoCodecSettings> before,