Add av1 svc configuration for target bitrates

This configuration mostly copies vp9 configuration for regular video,
but is done separately to allow tune av1 svc bitrates independently of vp9.

Bug: webrtc:12148
Change-Id: Icd11817ada8f9b6135ee2da57204eadb50de3954
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/195329
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32713}
diff --git a/modules/video_coding/video_codec_initializer.cc b/modules/video_coding/video_codec_initializer.cc
index 4777fe5..983e2a0 100644
--- a/modules/video_coding/video_codec_initializer.cc
+++ b/modules/video_coding/video_codec_initializer.cc
@@ -20,6 +20,7 @@
 #include "api/units/data_rate.h"
 #include "api/video/video_bitrate_allocation.h"
 #include "api/video_codecs/video_encoder.h"
+#include "modules/video_coding/codecs/av1/av1_svc_config.h"
 #include "modules/video_coding/codecs/vp9/svc_config.h"
 #include "modules/video_coding/include/video_coding_defines.h"
 #include "rtc_base/checks.h"
@@ -56,7 +57,6 @@
   RTC_DCHECK_GE(config.min_transmit_bitrate_bps, 0);
 
   VideoCodec video_codec;
-  memset(&video_codec, 0, sizeof(video_codec));
   video_codec.codecType = config.codec_type;
 
   switch (config.content_type) {
@@ -255,6 +255,11 @@
 
       break;
     }
+    case kVideoCodecAV1:
+      if (!SetAv1SvcConfig(video_codec)) {
+        RTC_LOG(LS_WARNING) << "Failed to configure svc bitrates for av1.";
+      }
+      break;
     case kVideoCodecH264: {
       if (!config.encoder_specific_settings)
         *video_codec.H264() = VideoEncoder::GetDefaultH264Settings();