Add error reporting on VP8 encoder configuration error

Bug: webrtc:11310
Change-Id: I4ceb565b211a2313add193a3859f3baeaacc3e87
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/182001
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Florent Castelli <orphis@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31964}

modules/video_coding/codecs/vp8/libvpx_interface.cc

@@ -195,6 +195,10 @@ class LibvpxVp8Facade : public LibvpxInterface {
       vpx_codec_iter_t* iter) const override {
     return ::vpx_codec_get_cx_data(ctx, iter);
   }
+
+  const char* codec_error_detail(vpx_codec_ctx_t* ctx) const override {
+    return ::vpx_codec_error_detail(ctx);
+  }
 };
 
 }  // namespace

modules/video_coding/codecs/vp8/libvpx_interface.h

@@ -93,6 +93,8 @@ class LibvpxInterface {
       vpx_codec_ctx_t* ctx,
       vpx_codec_iter_t* iter) const = 0;
 
+  virtual const char* codec_error_detail(vpx_codec_ctx_t* ctx) const = 0;
+
   // Returns interface wrapping the actual libvpx functions.
   static std::unique_ptr<LibvpxInterface> CreateEncoder();
 };

modules/video_coding/codecs/vp8/libvpx_vp8_encoder.cc

@@ -419,7 +419,9 @@ void LibvpxVp8Encoder::SetRates(const RateControlParameters& parameters) {
     vpx_codec_err_t err =
         libvpx_->codec_enc_config_set(&encoders_[i], &vpx_configs_[i]);
     if (err != VPX_CODEC_OK) {
-      RTC_LOG(LS_WARNING) << "Error configuring codec, error code: " << err;
+      RTC_LOG(LS_WARNING) << "Error configuring codec, error code: " << err
+                          << ", details: "
+                          << libvpx_->codec_error_detail(&encoders_[i]);
     }
   }
 }

modules/video_coding/codecs/vp8/test/mock_libvpx_interface.h

@@ -99,6 +99,10 @@ class MockLibvpxVp8Interface : public LibvpxInterface {
               codec_get_cx_data,
               (vpx_codec_ctx_t*, vpx_codec_iter_t*),
               (const, override));
+  MOCK_METHOD(const char*,
+              codec_error_detail,
+              (vpx_codec_ctx_t*),
+              (const, override));
 };
 
 }  // namespace webrtc