Expose codec implementation names in stats.

webrtc/video/video_decoder_unittest.cc

Index: webrtc/video/video_decoder_unittest.cc
diff --git a/webrtc/video/video_decoder_unittest.cc b/webrtc/video/video_decoder_unittest.cc
index be09b191ac1813596c62439f298608c43a1948ed..645be5597fc9b9725d4b7b427e3358ff5302ff52 100644
--- a/webrtc/video/video_decoder_unittest.cc
+++ b/webrtc/video/video_decoder_unittest.cc
@@ -52,6 +52,11 @@ class VideoDecoderSoftwareFallbackWrapperTest : public ::testing::Test {
       ++reset_count_;
       return WEBRTC_VIDEO_CODEC_OK;
     }
+
+    const char* ImplementationName() const override {
+      return "fake-decoder";
+    }
+
     int init_decode_count_ = 0;
     int decode_count_ = 0;
     int32_t decode_return_code_ = WEBRTC_VIDEO_CODEC_OK;
@@ -143,7 +148,7 @@ TEST_F(VideoDecoderSoftwareFallbackWrapperTest, ForwardsResetCall) {
 }
 
 // TODO(pbos): Fake a VP8 frame well enough to actually receive a callback from
-// the software encoder.
+// the software decoder.
 TEST_F(VideoDecoderSoftwareFallbackWrapperTest,
        ForwardsRegisterDecodeCompleteCallback) {
   class FakeDecodedImageCallback : public DecodedImageCallback {
@@ -162,4 +167,19 @@ TEST_F(VideoDecoderSoftwareFallbackWrapperTest,
   EXPECT_EQ(&callback2, fake_decoder_.decode_complete_callback_);
 }
 
+TEST_F(VideoDecoderSoftwareFallbackWrapperTest,
+       ReportsFallbackImplementationName) {
+  VideoCodec codec = {};
+  fallback_wrapper_.InitDecode(&codec, 2);
+
+  fake_decoder_.decode_return_code_ = WEBRTC_VIDEO_CODEC_FALLBACK_SOFTWARE;
+  EncodedImage encoded_image;
+  fallback_wrapper_.Decode(encoded_image, false, nullptr, nullptr, -1);
+  // Hard coded expected value since libvpx is the software implementation name
+  // for VP8. Change accordingly if the underlying implementation does.
+  EXPECT_STREQ("libvpx (fallback from: fake-decoder)",
+               fallback_wrapper_.ImplementationName());
+  fallback_wrapper_.Release();
+}
+
 }  // namespace webrtc