Add field VideoEncoderConfig::codec_type.

First step of the transition needed to reland cl
https://webrtc-review.googlesource.com/62062, and move payload_name
and payload_type out of VideoSendStream::Config::EncoderSettings.

If the new field is set to something different than kVideoCodecUnkown,
payload_name from EncoderSettings is ignored.

Bug: webrtc:8830
Change-Id: I515a91f8291cda79017332102cc6a10736d8a648
Reviewed-on: https://webrtc-review.googlesource.com/64001
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22555}
diff --git a/modules/video_coding/video_codec_initializer.cc b/modules/video_coding/video_codec_initializer.cc
index e473a16..02c0c4a 100644
--- a/modules/video_coding/video_codec_initializer.cc
+++ b/modules/video_coding/video_codec_initializer.cc
@@ -31,13 +31,18 @@
     bool nack_enabled,
     VideoCodec* codec,
     std::unique_ptr<VideoBitrateAllocator>* bitrate_allocator) {
-  if (PayloadStringToCodecType(settings.payload_name) == kVideoCodecMultiplex) {
-    VideoSendStream::Config::EncoderSettings associated_codec_settings =
-        settings;
-    associated_codec_settings.payload_name =
-        CodecTypeToPayloadString(kVideoCodecVP9);
-    if (!SetupCodec(config, associated_codec_settings, streams, nack_enabled,
-                    codec, bitrate_allocator)) {
+  VideoCodecType codec_type = config.codec_type;
+  // TODO(nisse): Transition hack, the intention is to delete the
+  // |settings| argument and require configuration via
+  // config.codec_type.
+  if (codec_type == kVideoCodecUnknown) {
+    codec_type = PayloadStringToCodecType(settings.payload_name);
+  }
+  if (codec_type == kVideoCodecMultiplex) {
+    VideoEncoderConfig associated_config = config.Copy();
+    associated_config.codec_type = kVideoCodecVP9;
+    if (!SetupCodec(associated_config, settings /* ignored */, streams,
+                    nack_enabled, codec, bitrate_allocator)) {
       RTC_LOG(LS_ERROR) << "Failed to create stereo encoder configuration.";
       return false;
     }
@@ -46,8 +51,7 @@
   }
 
   *codec =
-      VideoEncoderConfigToVideoCodec(config, streams, settings.payload_name,
-                                     settings.payload_type, nack_enabled);
+      VideoEncoderConfigToVideoCodec(config, streams, codec_type, nack_enabled);
   *bitrate_allocator = CreateBitrateAllocator(*codec);
 
   return true;
@@ -73,8 +77,7 @@
 VideoCodec VideoCodecInitializer::VideoEncoderConfigToVideoCodec(
     const VideoEncoderConfig& config,
     const std::vector<VideoStream>& streams,
-    const std::string& payload_name,
-    int payload_type,
+    VideoCodecType codec_type,
     bool nack_enabled) {
   static const int kEncoderMinBitrateKbps = 30;
   RTC_DCHECK(!streams.empty());
@@ -82,7 +85,7 @@
 
   VideoCodec video_codec;
   memset(&video_codec, 0, sizeof(video_codec));
-  video_codec.codecType = PayloadStringToCodecType(payload_name);
+  video_codec.codecType = codec_type;
 
   switch (config.content_type) {
     case VideoEncoderConfig::ContentType::kRealtimeVideo:
@@ -155,7 +158,9 @@
       break;
   }
 
-  video_codec.plType = payload_type;
+  // TODO(nisse): The plType field should be deleted. Luckily, our
+  // callers don't need it.
+  video_codec.plType = 0;
   video_codec.numberOfSimulcastStreams =
       static_cast<unsigned char>(streams.size());
   video_codec.minBitrate = streams[0].min_bitrate_bps / 1000;