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

webrtc/modules/video_coding/video_codec_initializer.cc

Index: webrtc/modules/video_coding/video_codec_initializer.cc
diff --git a/webrtc/modules/video_coding/video_codec_initializer.cc b/webrtc/modules/video_coding/video_codec_initializer.cc
index c759e84a36d8bd19db81cff0af6e291d2f204daa..7917a2789c6fbdef98589c984181334ccf951520 100644
--- a/webrtc/modules/video_coding/video_codec_initializer.cc
+++ b/webrtc/modules/video_coding/video_codec_initializer.cc
@@ -30,9 +30,9 @@ bool VideoCodecInitializer::SetupCodec(
     bool nack_enabled,
     VideoCodec* codec,
     std::unique_ptr<VideoBitrateAllocator>* bitrate_allocator) {
-  *codec =
-      VideoEncoderConfigToVideoCodec(config, streams, settings.payload_name,
-                                     settings.payload_type, nack_enabled);
+  *codec = VideoEncoderConfigToVideoCodec(
+      config, streams, settings.payload_name, settings.payload_type,
+      settings.stereo_associated_payload_name, nack_enabled);
 
   std::unique_ptr<TemporalLayersFactory> tl_factory;
   switch (codec->codecType) {
@@ -88,6 +88,7 @@ VideoCodec VideoCodecInitializer::VideoEncoderConfigToVideoCodec(
     const std::vector<VideoStream>& streams,
     const std::string& payload_name,
     int payload_type,
+    const std::string& stereo_associated_payload_name,
     bool nack_enabled) {
   static const int kEncoderMinBitrateKbps = 30;
   RTC_DCHECK(!streams.empty());
@@ -98,6 +99,13 @@ VideoCodec VideoCodecInitializer::VideoEncoderConfigToVideoCodec(
   video_codec.codecType = PayloadNameToCodecType(payload_name)
                               .value_or(VideoCodecType::kVideoCodecGeneric);
 
+  const bool is_stereo_codec = video_codec.codecType == kVideoCodecStereo;
+  if (is_stereo_codec) {
+    video_codec.codecType =
+        PayloadNameToCodecType(stereo_associated_payload_name)
+            .value_or(VideoCodecType::kVideoCodecGeneric);
+  }
+
   switch (config.content_type) {
     case VideoEncoderConfig::ContentType::kRealtimeVideo:
       video_codec.mode = kRealtimeVideo;
@@ -227,6 +235,10 @@ VideoCodec VideoCodecInitializer::VideoEncoderConfigToVideoCodec(
 
   RTC_DCHECK_GT(streams[0].max_framerate, 0);
   video_codec.maxFramerate = streams[0].max_framerate;
+
+  if (is_stereo_codec)
+    video_codec.codecType = kVideoCodecStereo;
+
   return video_codec;
 }