Issue #28 - Support new RFC-6381 VPx codec strings

* Add an extraction function to parse the RFC-6381 VP9 codec string.
* Add VP9-in-MP4 support to the decoder
* Use Codec detail extractor helper to tell if it's a new style VP8/VP9 codec string.
* Add a gtest for testing the extraction function.
* Add mBitDepth field to VideoInfo.
* Extract bit depth information from codec parameter string into VideoInfo::mBitDepth.
* Check bit depth in WebMDecoder to determine if we support HDR.
* Add an extraction function to parse the RFC-6381 VP9 codec string.

Based on Bug 1407919

10 files changed, 406 insertions, 12 deletions

diff --git a/dom/media/MediaInfo.h b/dom/media/MediaInfo.h
index 29dcf2cc9..4d37dd674 100644
--- a/dom/media/MediaInfo.h
+++ b/dom/media/MediaInfo.h
@@ -210,6 +210,7 @@ public:
     , mCodecSpecificConfig(aOther.mCodecSpecificConfig)
     , mExtraData(aOther.mExtraData)
     , mRotation(aOther.mRotation)
+    , mBitDepth(aOther.mBitDepth)
     , mImageRect(aOther.mImageRect)
   {
   }
@@ -300,6 +301,9 @@ public:
   // Describing how many degrees video frames should be rotated in clock-wise to
   // get correct view.
   Rotation mRotation;
+  
+  // Bits per channel -- Should be 8, 10 or 12. Default value is 8.
+  uint8_t mBitDepth = 8;
 
 private:
   // mImage may be cropped; currently only used with the WebM container.
diff --git a/dom/media/VideoUtils.cpp b/dom/media/VideoUtils.cpp
index 56033c2fa..cc8d56146 100644
--- a/dom/media/VideoUtils.cpp
+++ b/dom/media/VideoUtils.cpp
@@ -223,12 +223,185 @@ already_AddRefed<SharedThreadPool> GetMediaThreadPool(MediaThreadType aType)
 }
 
 bool
+ExtractVPXCodecDetails(const nsAString& aCodec,
+                       uint8_t& aProfile,
+                       uint8_t& aLevel,
+                       uint8_t& aBitDepth)
+{
+  uint8_t dummyChromaSubsampling = 1;
+  VideoColorSpace dummyColorspace;
+  return ExtractVPXCodecDetails(aCodec,
+                                aProfile,
+                                aLevel,
+                                aBitDepth,
+                                dummyChromaSubsampling,
+                                dummyColorspace);
+}
+
+bool ExtractVPXCodecDetails(const nsAString& aCodec,
+                            uint8_t& aProfile,
+                            uint8_t& aLevel,
+                            uint8_t& aBitDepth,
+                            uint8_t& aChromaSubsampling,
+                            VideoColorSpace& aColorSpace)
+{
+  nsTArray<nsString> fieldsArr;
+
+  // Assign default value.
+  aChromaSubsampling = 1;
+  
+  nsCharSeparatedTokenizer tokenizer(aCodec, '.');
+  while (tokenizer.hasMoreTokens()) {
+    const nsSubstring& token = tokenizer.nextToken();
+    fieldsArr.AppendElement(token);
+  }
+  auto fourCC = fieldsArr[0];
+
+  if (!fourCC.EqualsLiteral("vp09") && !fourCC.EqualsLiteral("vp08")) {
+    // Invalid 4CC
+    return false;
+  }
+  uint8_t *fields[] = { &aProfile, &aLevel, &aBitDepth, &aChromaSubsampling,
+                        &aColorSpace.mPrimaryId, &aColorSpace.mTransferId,
+                        &aColorSpace.mMatrixId, &aColorSpace.mRangeId };
+  int fieldsCount = 0;
+  nsresult rv;
+  for (int fieldsItr = 1; fieldsItr < fieldsArr.Length(); ++fieldsItr, ++fieldsCount) {
+    if (fieldsCount > 7) {
+      // No more than 8 fields are expected.
+      return false;
+    }
+    *(fields[fieldsCount]) =
+      static_cast<uint8_t>(fieldsArr[fieldsItr].ToInteger(&rv));
+    // We got invalid field value, parsing error.
+    NS_ENSURE_SUCCESS(rv, false);
+  }
+  // Mandatory Fields
+  // <sample entry 4CC>.<profile>.<level>.<bitDepth>.
+  // Optional Fields
+  // <chromaSubsampling>.<colourPrimaries>.<transferCharacteristics>.
+  // <matrixCoefficients>.<videoFullRangeFlag>
+  // First three fields are mandatory(we have parsed 4CC).
+  if (fieldsCount < 3) {
+    // Invalid number of fields.
+    return false;
+  }
+  // Start to validate the parsing value.
+
+  // profile should be 0,1,2 or 3.
+  // See https://www.webmproject.org/vp9/profiles/
+  // We don't support more than profile 2
+  if (aProfile > 2) {
+    // Invalid profile.
+    return false;
+  }
+
+ // level, See https://www.webmproject.org/vp9/mp4/#semantics_1
+  switch (aLevel) {
+    case 10:
+    case 11:
+    case 20:
+    case 21:
+    case 30:
+    case 31:
+    case 40:
+    case 41:
+    case 50:
+    case 51:
+    case 52:
+    case 60:
+    case 61:
+    case 62:
+      break;
+    default:
+      // Invalid level.
+      return false;
+  }
+
+  if (aBitDepth != 8 && aBitDepth != 10 && aBitDepth != 12) {
+    // Invalid bitDepth:
+    return false;
+  }
+
+  if (fieldsCount == 3) {
+    // No more options.
+    return true;
+  }
+
+  // chromaSubsampling should be 0,1,2,3...4~7 are reserved.
+  if (aChromaSubsampling > 3) {
+    return false;
+  }
+
+  if (fieldsCount == 4) {
+    // No more options.
+    return true;
+  }
+
+  // It is an integer that is defined by the "Colour primaries"
+  // section of ISO/IEC 23001-8:2016 Table 2.
+  // We treat reserved value as false case.
+  const auto& primaryId = aColorSpace.mPrimaryId;
+  if (primaryId == 0 || primaryId == 3 || primaryId > 22) {
+    // reserved value.
+    return false;
+  }
+  if (primaryId > 12 && primaryId < 22) {
+    // 13~21 are reserved values.
+    return false;
+  }
+
+  if (fieldsCount == 5) {
+    // No more options.
+    return true;
+  }
+
+  // It is an integer that is defined by the
+  // "Transfer characteristics" section of ISO/IEC 23001-8:2016 Table 3.
+  // We treat reserved value as false case.
+  const auto& transferId = aColorSpace.mTransferId;
+  if (transferId == 0 || transferId == 3 || transferId > 18) {
+    // reserved value.
+    return false;
+  }
+
+  if (fieldsCount == 6) {
+    // No more options.
+    return true;
+  }
+
+  // It is an integer that is defined by the
+  // "Matrix coefficients" section of ISO/IEC 23001-8:2016 Table 4.
+  // We treat reserved value as false case.
+  const auto& matrixId = aColorSpace.mMatrixId;
+  if (matrixId == 3 || matrixId > 11) {
+    return false;
+  }
+
+  // If matrixCoefficients is 0 (RGB), then chroma subsampling MUST be 3 (4:4:4).
+  if (matrixId == 0 && aChromaSubsampling != 3) {
+    return false;
+  }
+
+  if (fieldsCount == 7) {
+    // No more options.
+    return true;
+  }
+
+  // videoFullRangeFlag indicates the black level and range of the luma and
+  // chroma signals. 0 = legal range (e.g. 16-235 for 8 bit sample depth);
+  // 1 = full range (e.g. 0-255 for 8-bit sample depth).
+  const auto& rangeId = aColorSpace.mRangeId;
+  return rangeId <= 1;
+}
+
+bool
 ExtractH264CodecDetails(const nsAString& aCodec,
                         int16_t& aProfile,
                         int16_t& aLevel)
 {
   // H.264 codecs parameters have a type defined as avcN.PPCCLL, where
-  // N = avc type. avc3 is avcc with SPS & PPS implicit (within stream)
+  // N = avc type. avc3 is avcc with SPS & PPS implicit (within stream)
   // PP = profile_idc, CC = constraint_set flags, LL = level_idc.
   // We ignore the constraint_set flags, as it's not clear from any
   // documentation what constraints the platform decoders support.
@@ -468,15 +641,25 @@ IsAACCodecString(const nsAString& aCodec)
 bool
 IsVP8CodecString(const nsAString& aCodec)
 {
+  uint8_t profile = 0;
+  uint8_t level = 0;
+  uint8_t bitDepth = 0;
   return aCodec.EqualsLiteral("vp8") ||
-         aCodec.EqualsLiteral("vp8.0");
+         aCodec.EqualsLiteral("vp8.0") ||
+         (StartsWith(NS_ConvertUTF16toUTF8(aCodec), "vp08") &&
+          ExtractVPXCodecDetails(aCodec, profile, level, bitDepth));
 }
 
 bool
 IsVP9CodecString(const nsAString& aCodec)
 {
+  uint8_t profile = 0;
+  uint8_t level = 0;
+  uint8_t bitDepth = 0;
   return aCodec.EqualsLiteral("vp9") ||
-         aCodec.EqualsLiteral("vp9.0");
+         aCodec.EqualsLiteral("vp9.0") ||
+         (StartsWith(NS_ConvertUTF16toUTF8(aCodec), "vp09") &&
+          ExtractVPXCodecDetails(aCodec, profile, level, bitDepth));
 }
 
 #ifdef MOZ_AV1
diff --git a/dom/media/VideoUtils.h b/dom/media/VideoUtils.h
index eee6561fd..421e6bb51 100644
--- a/dom/media/VideoUtils.h
+++ b/dom/media/VideoUtils.h
@@ -257,6 +257,34 @@ ExtractH264CodecDetails(const nsAString& aCodecs,
                         int16_t& aProfile,
                         int16_t& aLevel);
 
+struct VideoColorSpace
+{
+  // TODO: Define the value type as strong type enum
+  // to better know the exact meaning corresponding to ISO/IEC 23001-8:2016.
+  // Default value is listed https://www.webmproject.org/vp9/mp4/#optional-fields
+  uint8_t mPrimaryId = 1; // Table 2
+  uint8_t mTransferId = 1; // Table 3
+  uint8_t mMatrixId = 1; // Table 4
+  uint8_t mRangeId = 0;
+};
+
+// Extracts the VPX codecs parameter string.
+// See https://www.webmproject.org/vp9/mp4/#codecs-parameter-string
+// for more details.
+// Returns false on failure.
+bool
+ExtractVPXCodecDetails(const nsAString& aCodec,
+                       uint8_t& aProfile,
+                       uint8_t& aLevel,
+                       uint8_t& aBitDepth);
+bool
+ExtractVPXCodecDetails(const nsAString& aCodec,
+                       uint8_t& aProfile,
+                       uint8_t& aLevel,
+                       uint8_t& aBitDepth,
+                       uint8_t& aChromaSubsampling,
+                       VideoColorSpace& aColorSpace);
+
 // Use a cryptographic quality PRNG to generate raw random bytes
 // and convert that to a base64 string.
 nsresult
diff --git a/dom/media/fmp4/MP4Decoder.cpp b/dom/media/fmp4/MP4Decoder.cpp
index 8cddfc4f4..9b0886e74 100644
--- a/dom/media/fmp4/MP4Decoder.cpp
+++ b/dom/media/fmp4/MP4Decoder.cpp
@@ -131,6 +131,19 @@ MP4Decoder::CanHandleMediaType(const MediaContentType& aType,
             NS_LITERAL_CSTRING("audio/flac"), aType));
         continue;
       }
+      if (IsVP9CodecString(codec)) {
+        auto trackInfo =
+          CreateTrackInfoWithMIMETypeAndContentTypeExtraParameters(
+            NS_LITERAL_CSTRING("video/vp9"), aType);
+        uint8_t profile = 0;
+        uint8_t level = 0;
+        uint8_t bitDepth = 0;
+        if (ExtractVPXCodecDetails(codec, profile, level, bitDepth)) {
+          trackInfo->GetAsVideoInfo()->mBitDepth = bitDepth;
+        }
+        trackInfos.AppendElement(Move(trackInfo));
+        continue;
+      }
 #ifdef MOZ_AV1
       if (IsAV1CodecString(codec)) {
         trackInfos.AppendElement(
diff --git a/dom/media/mediasource/gtest/TestExtractVPXCodecDetails.cpp b/dom/media/mediasource/gtest/TestExtractVPXCodecDetails.cpp
new file mode 100644
index 000000000..be8a120f6
--- /dev/null
+++ b/dom/media/mediasource/gtest/TestExtractVPXCodecDetails.cpp
@@ -0,0 +1,111 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <gtest/gtest.h>
+#include <stdint.h>
+
+#include "VideoUtils.h"
+
+using namespace mozilla;
+
+struct TestData
+{
+  const char16_t* const mCodecParameterString;
+  const bool mExpectedValue;
+};
+
+TEST(ExtractVPXCodecDetails, TestDataLength) {
+  TestData tests[] =
+  {
+    {u"vp09.00.11.08", true }, // valid case
+    {u"vp09.00.11.08.00", true }, // valid case, have extra optional field
+    {u"vp09.02.10.10.01.09.16.09.01", true}, // maximum length valid case
+    {u"vp09", false }, // lack of mandatory fields
+    {u"vp09.00", false }, // lack of mandatory fields
+    {u"vp09.00.11", false }, // lack of mandatory fields
+    {u"vp09.02.10.10.01.09.16.09.01.00", false} // more than 9 fields, invalid case.
+  };
+
+  for (const auto& data : tests) {
+    uint8_t profile = 0;
+    uint8_t level = 0;
+    uint8_t bitDepth = 0;
+    bool result = ExtractVPXCodecDetails(nsString(data.mCodecParameterString), profile, level, bitDepth);
+    EXPECT_EQ(result, data.mExpectedValue) << NS_ConvertUTF16toUTF8(data.mCodecParameterString).get();
+  }
+}
+
+TEST(ExtractVPXCodecDetails, TestInputData) {
+  TestData tests[] =
+  {
+    {u"vp09.02..08", false}, // malformed
+    {u"vp9.02.10.08", false}, // invalid 4CC
+    {u"vp09.03.11.08", false }, // profile should < 3
+    {u"vp09.00.63.08.00", false }, // invalid level
+    {u"vp09.02.10.13", false}, // invalid bitDepth
+    {u"vp09.02.10.10.04", false}, // invalid chromasubsampling, should < 4
+    {u"vp09.02.10.10.01.00", false}, // invalid Colour primaries, should not be 0,3 or < 23.
+    {u"vp09.02.10.10.01.03", false}, // invalid Colour primaries.
+    {u"vp09.02.10.10.01.23", false}, // invalid Colour primaries.
+    {u"vp09.02.10.10.01.09.00", false}, // invalid Transfer characteristics, should not be 0,3 or < 19.
+    {u"vp09.02.10.10.01.09.03", false}, // invalid Transfer characteristics.
+    {u"vp09.02.10.10.01.09.19", false}, // invalid Transfer characteristics.
+    {u"vp09.02.10.10.01.09.16.12", false}, // invalid Matrix coefficients, should not be 3 or < 12.
+    {u"vp09.02.10.10.01.09.16.03", false}, // invalid matrix.
+    {u"vp09.02.10.10.01.09.16.09.02", false}, // invalid range, should < 2.
+    // Test if matrixCoefficients is 0 (RGB), then chroma subsampling MUST be 3 (4:4:4).
+    {u"vp09.02.10.08.03.09.16.00.00", true} // invalid combination.
+  };
+
+  for (const auto& data : tests) {
+    uint8_t profile = 0;
+    uint8_t level = 0;
+    uint8_t bitDepth = 0;
+    bool result = ExtractVPXCodecDetails(nsString(data.mCodecParameterString), profile, level, bitDepth);
+    EXPECT_EQ(result, data.mExpectedValue) << NS_ConvertUTF16toUTF8(data.mCodecParameterString).get();
+  }
+}
+
+TEST(ExtractVPXCodecDetails, TestParsingOutput) {
+    uint8_t profile = 0;
+    uint8_t level = 0;
+    uint8_t bitDepth = 0;
+    uint8_t chromaSubsampling = 0;
+    VideoColorSpace colorSpace;
+    auto data = u"vp09.01.11.08";
+    bool result = ExtractVPXCodecDetails(nsString(data),
+                                         profile,
+                                         level,
+                                         bitDepth,
+                                         chromaSubsampling,
+                                         colorSpace);
+    EXPECT_EQ(result, true);
+    EXPECT_EQ(profile, 1);
+    EXPECT_EQ(level, 11);
+    EXPECT_EQ(bitDepth, 8);
+    // Should keep spec defined default value.
+    EXPECT_EQ(chromaSubsampling, 1);
+    EXPECT_EQ(colorSpace.mPrimaryId, 1);
+    EXPECT_EQ(colorSpace.mTransferId, 1);
+    EXPECT_EQ(colorSpace.mMatrixId, 1);
+    EXPECT_EQ(colorSpace.mRangeId, 0);
+
+    data = u"vp09.02.10.10.01.09.16.09.01";
+    result = ExtractVPXCodecDetails(nsString(data),
+                                    profile,
+                                    level,
+                                    bitDepth,
+                                    chromaSubsampling,
+                                    colorSpace);
+    EXPECT_EQ(result, true);
+    EXPECT_EQ(profile, 2);
+    EXPECT_EQ(level, 10);
+    EXPECT_EQ(bitDepth, 10);
+    EXPECT_EQ(chromaSubsampling, 1);
+    EXPECT_EQ(colorSpace.mPrimaryId, 9);
+    EXPECT_EQ(colorSpace.mTransferId, 16);
+    EXPECT_EQ(colorSpace.mMatrixId, 9);
+    EXPECT_EQ(colorSpace.mRangeId, 1);
+}
diff --git a/dom/media/mediasource/gtest/moz.build b/dom/media/mediasource/gtest/moz.build
index 2cccc80a2..2a59a8343 100644
--- a/dom/media/mediasource/gtest/moz.build
+++ b/dom/media/mediasource/gtest/moz.build
@@ -5,6 +5,7 @@
 
 UNIFIED_SOURCES += [
     'TestContainerParser.cpp',
+    'TestExtractVPXCodecDetails.cpp',
 ]
 
 LOCAL_INCLUDES += [
diff --git a/dom/media/platforms/PlatformDecoderModule.h b/dom/media/platforms/PlatformDecoderModule.h
index 54feb13c7..1507b4492 100644
--- a/dom/media/platforms/PlatformDecoderModule.h
+++ b/dom/media/platforms/PlatformDecoderModule.h
@@ -125,9 +125,11 @@ public:
   virtual bool Supports(const TrackInfo& aTrackInfo,
                         DecoderDoctorDiagnostics* aDiagnostics) const
   {
-    // By default, fall back to SupportsMimeType with just the MIME string.
-    // (So PDMs do not need to override this method -- yet.)
-    return SupportsMimeType(aTrackInfo.mMimeType, aDiagnostics);
+    if (!SupportsMimeType(aTrackInfo.mMimeType, aDiagnostics)) {
+      return false;
+    }
+    const auto videoInfo = aTrackInfo.GetAsVideoInfo();
+    return !videoInfo || SupportsBitDepth(videoInfo->mBitDepth, aDiagnostics);
   }
 
   enum class ConversionRequired : uint8_t {
@@ -149,6 +151,15 @@ protected:
   friend class PDMFactory;
   friend class dom::RemoteDecoderModule;
 
+  // Indicates if the PlatformDecoderModule supports decoding of aBitDepth.
+  // Should override this method when the platform can support bitDepth != 8.
+  virtual bool SupportsBitDepth(const uint8_t aBitDepth,
+                                DecoderDoctorDiagnostics* aDiagnostics) const
+  {
+    return aBitDepth == 8;
+  }
+
+
   // Creates a Video decoder. The layers backend is passed in so that
   // decoders can determine whether hardware accelerated decoding can be used.
   // Asynchronous decoding of video should be done in runnables dispatched
diff --git a/dom/media/platforms/ffmpeg/FFmpegDecoderModule.h b/dom/media/platforms/ffmpeg/FFmpegDecoderModule.h
index 969ac7e0b..d220fcf91 100644
--- a/dom/media/platforms/ffmpeg/FFmpegDecoderModule.h
+++ b/dom/media/platforms/ffmpeg/FFmpegDecoderModule.h
@@ -77,6 +77,21 @@ public:
     }
   }
 
+protected:
+  bool SupportsBitDepth(const uint8_t aBitDepth,
+                        DecoderDoctorDiagnostics* aDiagnostics) const override
+  {
+    // We don't support bitDepth > 8 when compositor backend is D3D11.
+    // But we don't have KnowsCompositor or any object
+    // that we can ask for the layersbackend type.
+    // We should remove this restriction until
+    // we solve the D3D11 compositor backend issue.
+#if defined(XP_LINUX) || defined(XP_MACOSX)
+    return true;
+#endif
+    return aBitDepth == 8;
+  }
+
 private:
   FFmpegLibWrapper* mLib;
 };
diff --git a/dom/media/platforms/wmf/WMFDecoderModule.cpp b/dom/media/platforms/wmf/WMFDecoderModule.cpp
index 6268135ec..26c01aba5 100644
--- a/dom/media/platforms/wmf/WMFDecoderModule.cpp
+++ b/dom/media/platforms/wmf/WMFDecoderModule.cpp
@@ -213,6 +213,14 @@ bool
 WMFDecoderModule::Supports(const TrackInfo& aTrackInfo,
                            DecoderDoctorDiagnostics* aDiagnostics) const
 {
+  // Check bit depth of video.
+  // XXXMC: This is here in case we want to start accepting HDR video. Do we?
+  //        This currently defaults to a fail if video bitdepth != 8
+  const auto videoInfo = aTrackInfo.GetAsVideoInfo();
+  if (videoInfo && !SupportsBitDepth(videoInfo->mBitDepth, aDiagnostics)) {
+    return false;
+  }
+
   if ((aTrackInfo.mMimeType.EqualsLiteral("audio/mp4a-latm") ||
        aTrackInfo.mMimeType.EqualsLiteral("audio/mp4")) &&
        WMFDecoderModule::HasAAC()) {
@@ -229,7 +237,7 @@ WMFDecoderModule::Supports(const TrackInfo& aTrackInfo,
         return false;
       }
     } else {
-      // Windows <=7 supports at most 1920x1088.
+      // Windows 7 supports at most 1920x1088.
       if (videoInfo->mImage.width > 1920 || videoInfo->mImage.height > 1088) {
         return false;
       }
diff --git a/dom/media/webm/WebMDecoder.cpp b/dom/media/webm/WebMDecoder.cpp
index cbe9ffdb7..b4cc794e7 100644
--- a/dom/media/webm/WebMDecoder.cpp
+++ b/dom/media/webm/WebMDecoder.cpp
@@ -12,6 +12,7 @@
 #include "MediaDecoderStateMachine.h"
 #include "WebMDemuxer.h"
 #include "WebMDecoder.h"
+#include "PDMFactory.h"
 #include "VideoUtils.h"
 #include "nsContentTypeParser.h"
 
@@ -66,11 +67,30 @@ WebMDecoder::CanHandleMediaType(const nsACString& aMIMETypeExcludingCodecs,
     }
     // Note: Only accept VP8/VP9 in a video content type, not in an audio
     // content type.
-    if ((isWebMVideo || isMatroskaVideo) &&
-        (codec.EqualsLiteral("vp8") || codec.EqualsLiteral("vp8.0") ||
-         codec.EqualsLiteral("vp9") || codec.EqualsLiteral("vp9.0"))) {
-
-      continue;
+    if (isWebMVideo || isMatroskaVideo) {
+      UniquePtr<TrackInfo> trackInfo;
+      if (IsVP9CodecString(codec))  {
+        trackInfo = CreateTrackInfoWithMIMEType(
+          NS_LITERAL_CSTRING("video/vp9"));
+      } else if (IsVP8CodecString(codec)) {
+        trackInfo = CreateTrackInfoWithMIMEType(
+          NS_LITERAL_CSTRING("video/vp8"));
+      }
+      // If it is vp8 or vp9, check the bit depth.
+      if (trackInfo) {
+        uint8_t profile = 0;
+        uint8_t level = 0;
+        uint8_t bitDepth = 0;
+        if (ExtractVPXCodecDetails(codec, profile, level, bitDepth)) {
+          trackInfo->GetAsVideoInfo()->mBitDepth = bitDepth;
+        }
+        // Verify that we have a PDM that supports this bit depth.
+        RefPtr<PDMFactory> platform = new PDMFactory();
+        if (!platform->Supports(*trackInfo, nullptr)) {
+          return false;
+        }
+        continue;
+      }
     }
 #ifdef MOZ_AV1
     if (MediaPrefs::AV1Enabled() && IsAV1CodecString(codec)) {