webkit2gtk3/gstreamer-1.16.1.patch

diff --git a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp
index 77a0d6507240..353fb87900ba 100644
--- a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp
+++ b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp
@@ -479,7 +479,6 @@ bool MediaPlayerPrivateGStreamer::doSeek(const MediaTime& position, float rate)
 
     auto seekStart = toGstClockTime(startTime);
     auto seekStop = toGstClockTime(endTime);
-    GST_DEBUG_OBJECT(pipeline(), "[Seek] Performing actual seek to %" GST_TIMEP_FORMAT " (endTime: %" GST_TIMEP_FORMAT ") at rate %f", &seekStart, &seekStop, rate);
     return gst_element_seek(m_pipeline.get(), rate, GST_FORMAT_TIME, m_seekFlags, GST_SEEK_TYPE_SET, seekStart, GST_SEEK_TYPE_SET, seekStop);
 }
 
@@ -3296,9 +3295,6 @@ static uint32_t fourccValue(GstVideoFormat format)
     case GST_VIDEO_FORMAT_P010_10LE:
     case GST_VIDEO_FORMAT_P010_10BE:
         return uint32_t(DMABufFormat::FourCC::P010);
-    case GST_VIDEO_FORMAT_P016_LE:
-    case GST_VIDEO_FORMAT_P016_BE:
-        return uint32_t(DMABufFormat::FourCC::P016);
     default:
         break;
     }

From bbc469a2b43531275243850693af65f5f7d11bc6 Mon Sep 17 00:00:00 2001
From: Michael Catanzaro <mcatanzaro@redhat.com>
Date: Wed, 20 Sep 2023 13:07:44 -0500
Subject: [PATCH 1/2] Revert GStreamer 1.18 dependency

This reverts https://commits.webkit.org/263218@main
---
 .../AudioSourceProviderGStreamer.cpp          |  5 +-
 .../gstreamer/GLVideoSinkGStreamer.cpp        | 11 ++--
 .../gstreamer/GStreamerAudioMixer.cpp         |  2 +-
 .../graphics/gstreamer/GStreamerCommon.cpp    | 52 +++++++++++++++++++
 .../graphics/gstreamer/GStreamerCommon.h      | 16 ++++++
 .../gstreamer/GStreamerRegistryScanner.cpp    |  9 +++-
 .../gstreamer/MediaPlayerPrivateGStreamer.cpp | 46 +++++++++++++---
 .../gstreamer/MediaPlayerPrivateGStreamer.h   |  1 +
 Source/cmake/GStreamerChecks.cmake            |  2 +-
 9 files changed, 127 insertions(+), 17 deletions(-)

diff --git a/Source/WebCore/platform/audio/gstreamer/AudioSourceProviderGStreamer.cpp b/Source/WebCore/platform/audio/gstreamer/AudioSourceProviderGStreamer.cpp
index a97e6431802c..d8b1a1f4bd8b 100644
--- a/Source/WebCore/platform/audio/gstreamer/AudioSourceProviderGStreamer.cpp
+++ b/Source/WebCore/platform/audio/gstreamer/AudioSourceProviderGStreamer.cpp
@@ -122,7 +122,10 @@ AudioSourceProviderGStreamer::AudioSourceProviderGStreamer(MediaStreamTrackPriva
     g_signal_connect_swapped(decodebin, "pad-added", G_CALLBACK(+[](AudioSourceProviderGStreamer* provider, GstPad* pad) {
         auto padCaps = adoptGRef(gst_pad_query_caps(pad, nullptr));
         bool isAudio = doCapsHaveType(padCaps.get(), "audio");
-        RELEASE_ASSERT(isAudio);
+        if (webkitGstCheckVersion(1, 18, 0))
+            RELEASE_ASSERT(isAudio);
+        else if (!isAudio)
+            return;
 
         auto sinkPad = adoptGRef(gst_element_get_static_pad(provider->m_audioSinkBin.get(), "sink"));
         gst_pad_link(pad, sinkPad.get());
diff --git a/Source/WebCore/platform/graphics/gstreamer/GLVideoSinkGStreamer.cpp b/Source/WebCore/platform/graphics/gstreamer/GLVideoSinkGStreamer.cpp
index 1a7480828861..f3a51be68534 100644
--- a/Source/WebCore/platform/graphics/gstreamer/GLVideoSinkGStreamer.cpp
+++ b/Source/WebCore/platform/graphics/gstreamer/GLVideoSinkGStreamer.cpp
@@ -186,12 +186,13 @@ static void webKitGLVideoSinkGetProperty(GObject* object, guint propertyId, GVal
     WebKitGLVideoSink* sink = WEBKIT_GL_VIDEO_SINK(object);
 
     switch (propertyId) {
-    case PROP_STATS: {
-        GUniqueOutPtr<GstStructure> stats;
-        g_object_get(sink->priv->appSink.get(), "stats", &stats.outPtr(), nullptr);
-        gst_value_set_structure(value, stats.get());
+    case PROP_STATS:
+        if (webkitGstCheckVersion(1, 18, 0)) {
+            GUniqueOutPtr<GstStructure> stats;
+            g_object_get(sink->priv->appSink.get(), "stats", &stats.outPtr(), nullptr);
+            gst_value_set_structure(value, stats.get());
+        }
         break;
-    }
     default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID(object, propertyId, paramSpec);
         RELEASE_ASSERT_NOT_REACHED();
diff --git a/Source/WebCore/platform/graphics/gstreamer/GStreamerAudioMixer.cpp b/Source/WebCore/platform/graphics/gstreamer/GStreamerAudioMixer.cpp
index ad4b1ae3f77e..fb7e617b5d56 100644
--- a/Source/WebCore/platform/graphics/gstreamer/GStreamerAudioMixer.cpp
+++ b/Source/WebCore/platform/graphics/gstreamer/GStreamerAudioMixer.cpp
@@ -32,7 +32,7 @@ GST_DEBUG_CATEGORY_STATIC(webkit_media_gst_audio_mixer_debug);
 
 bool GStreamerAudioMixer::isAvailable()
 {
-    return isGStreamerPluginAvailable("inter") && isGStreamerPluginAvailable("audiomixer");
+    return webkitGstCheckVersion(1, 18, 0) && isGStreamerPluginAvailable("inter") && isGStreamerPluginAvailable("audiomixer");
 }
 
 GStreamerAudioMixer& GStreamerAudioMixer::singleton()
diff --git a/Source/WebCore/platform/graphics/gstreamer/GStreamerCommon.cpp b/Source/WebCore/platform/graphics/gstreamer/GStreamerCommon.cpp
index 794beaa6932a..5f6b3826f182 100644
--- a/Source/WebCore/platform/graphics/gstreamer/GStreamerCommon.cpp
+++ b/Source/WebCore/platform/graphics/gstreamer/GStreamerCommon.cpp
@@ -105,6 +105,24 @@ GstPad* webkitGstGhostPadFromStaticTemplate(GstStaticPadTemplate* staticPadTempl
     return pad;
 }
 
+#if !GST_CHECK_VERSION(1, 18, 0)
+void webkitGstVideoFormatInfoComponent(const GstVideoFormatInfo* info, guint plane, gint components[GST_VIDEO_MAX_COMPONENTS])
+{
+    guint c, i = 0;
+
+    /* Reverse mapping of info->plane. */
+    for (c = 0; c < GST_VIDEO_FORMAT_INFO_N_COMPONENTS(info); c++) {
+        if (GST_VIDEO_FORMAT_INFO_PLANE(info, c) == plane) {
+            components[i] = c;
+            i++;
+        }
+    }
+
+    for (c = i; c < GST_VIDEO_MAX_COMPONENTS; c++)
+        components[c] = -1;
+}
+#endif
+
 #if ENABLE(VIDEO)
 bool getVideoSizeAndFormatFromCaps(const GstCaps* caps, WebCore::IntSize& size, GstVideoFormat& format, int& pixelAspectRatioNumerator, int& pixelAspectRatioDenominator, int& stride)
 {
@@ -748,6 +766,36 @@ String gstStructureToJSONString(const GstStructure* structure)
     return value->toJSONString();
 }
 
+#if !GST_CHECK_VERSION(1, 18, 0)
+GstClockTime webkitGstElementGetCurrentRunningTime(GstElement* element)
+{
+    g_return_val_if_fail(GST_IS_ELEMENT(element), GST_CLOCK_TIME_NONE);
+
+    auto baseTime = gst_element_get_base_time(element);
+    if (!GST_CLOCK_TIME_IS_VALID(baseTime)) {
+        GST_DEBUG_OBJECT(element, "Could not determine base time");
+        return GST_CLOCK_TIME_NONE;
+    }
+
+    auto clock = adoptGRef(gst_element_get_clock(element));
+    if (!clock) {
+        GST_DEBUG_OBJECT(element, "Element has no clock");
+        return GST_CLOCK_TIME_NONE;
+    }
+
+    auto clockTime = gst_clock_get_time(clock.get());
+    if (!GST_CLOCK_TIME_IS_VALID(clockTime))
+        return GST_CLOCK_TIME_NONE;
+
+    if (clockTime < baseTime) {
+        GST_DEBUG_OBJECT(element, "Got negative current running time");
+        return GST_CLOCK_TIME_NONE;
+    }
+
+    return clockTime - baseTime;
+}
+#endif
+
 GstClockTime webkitGstInitTime()
 {
     return s_webkitGstInitTime;
@@ -805,6 +853,7 @@ PlatformVideoColorSpace videoColorSpaceFromInfo(const GstVideoInfo& info)
     case GST_VIDEO_TRANSFER_BT709:
         colorSpace.transfer = PlatformVideoTransferCharacteristics::Bt709;
         break;
+#if GST_CHECK_VERSION(1, 18, 0)
     case GST_VIDEO_TRANSFER_BT601:
         colorSpace.transfer = PlatformVideoTransferCharacteristics::Smpte170m;
         break;
@@ -817,6 +866,7 @@ PlatformVideoColorSpace videoColorSpaceFromInfo(const GstVideoInfo& info)
     case GST_VIDEO_TRANSFER_BT2020_10:
         colorSpace.transfer = PlatformVideoTransferCharacteristics::Bt2020_10bit;
         break;
+#endif
     case GST_VIDEO_TRANSFER_BT2020_12:
         colorSpace.transfer = PlatformVideoTransferCharacteristics::Bt2020_12bit;
         break;
@@ -935,6 +985,7 @@ void fillVideoInfoColorimetryFromColorSpace(GstVideoInfo* info, const PlatformVi
         case PlatformVideoTransferCharacteristics::Bt709:
             GST_VIDEO_INFO_COLORIMETRY(info).transfer = GST_VIDEO_TRANSFER_BT709;
             break;
+#if GST_CHECK_VERSION(1, 18, 0)
         case PlatformVideoTransferCharacteristics::Smpte170m:
             GST_VIDEO_INFO_COLORIMETRY(info).transfer = GST_VIDEO_TRANSFER_BT601;
             break;
@@ -947,6 +998,7 @@ void fillVideoInfoColorimetryFromColorSpace(GstVideoInfo* info, const PlatformVi
         case PlatformVideoTransferCharacteristics::Bt2020_10bit:
             GST_VIDEO_INFO_COLORIMETRY(info).transfer = GST_VIDEO_TRANSFER_BT2020_10;
             break;
+#endif
         case PlatformVideoTransferCharacteristics::Bt2020_12bit:
             GST_VIDEO_INFO_COLORIMETRY(info).transfer = GST_VIDEO_TRANSFER_BT2020_12;
             break;
diff --git a/Source/WebCore/platform/graphics/gstreamer/GStreamerCommon.h b/Source/WebCore/platform/graphics/gstreamer/GStreamerCommon.h
index fae7ef96d6c5..65ef4bfefdaa 100644
--- a/Source/WebCore/platform/graphics/gstreamer/GStreamerCommon.h
+++ b/Source/WebCore/platform/graphics/gstreamer/GStreamerCommon.h
@@ -56,6 +56,15 @@ inline bool webkitGstCheckVersion(guint major, guint minor, guint micro)
     return true;
 }
 
+// gst_video_format_info_component() is GStreamer 1.18 API, so for older versions we use a local
+// vendored copy of the function.
+#if !GST_CHECK_VERSION(1, 18, 0)
+#define GST_VIDEO_MAX_COMPONENTS 4
+void webkitGstVideoFormatInfoComponent(const GstVideoFormatInfo*, guint, gint components[GST_VIDEO_MAX_COMPONENTS]);
+
+#define gst_video_format_info_component webkitGstVideoFormatInfoComponent
+#endif
+
 #define GST_VIDEO_CAPS_TYPE_PREFIX  "video/"
 #define GST_AUDIO_CAPS_TYPE_PREFIX  "audio/"
 #define GST_TEXT_CAPS_TYPE_PREFIX   "text/"
@@ -323,6 +332,13 @@ GstElement* makeGStreamerBin(const char* description, bool ghostUnlinkedPads);
 
 String gstStructureToJSONString(const GstStructure*);
 
+// gst_element_get_current_running_time() is GStreamer 1.18 API, so for older versions we use a local
+// vendored copy of the function.
+#if !GST_CHECK_VERSION(1, 18, 0)
+GstClockTime webkitGstElementGetCurrentRunningTime(GstElement*);
+#define gst_element_get_current_running_time webkitGstElementGetCurrentRunningTime
+#endif
+
 GstClockTime webkitGstInitTime();
 
 PlatformVideoColorSpace videoColorSpaceFromCaps(const GstCaps*);
diff --git a/Source/WebCore/platform/graphics/gstreamer/GStreamerRegistryScanner.cpp b/Source/WebCore/platform/graphics/gstreamer/GStreamerRegistryScanner.cpp
index 7cd1926e6d15..032f086b43c0 100644
--- a/Source/WebCore/platform/graphics/gstreamer/GStreamerRegistryScanner.cpp
+++ b/Source/WebCore/platform/graphics/gstreamer/GStreamerRegistryScanner.cpp
@@ -900,8 +900,13 @@ GStreamerRegistryScanner::CodecLookupResult GStreamerRegistryScanner::isAVC1Code
         return checkH264Caps(makeString("video/x-h264, level=(string)", maxLevelString).utf8().data());
     }
 
-    GST_DEBUG("Checking video decoders for constrained caps");
-    return checkH264Caps(makeString("video/x-h264, level=(string)", level, ", profile=(string)", profile).utf8().data());
+    if (webkitGstCheckVersion(1, 18, 0)) {
+        GST_DEBUG("Checking video decoders for constrained caps");
+        return checkH264Caps(makeString("video/x-h264, level=(string)", level, ", profile=(string)", profile).utf8().data());
+    }
+
+    GST_DEBUG("Falling back to unconstrained caps");
+    return checkH264Caps("video/x-h264");
 }
 
 const char* GStreamerRegistryScanner::configurationNameForLogging(Configuration configuration) const
diff --git a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp
index aad2c0bc432b..77a0d6507240 100644
--- a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp
+++ b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.cpp
@@ -4114,7 +4114,29 @@ GstElement* MediaPlayerPrivateGStreamer::createVideoSink()
         g_signal_connect_swapped(m_videoSink.get(), "repaint-cancelled", G_CALLBACK(repaintCancelledCallback), this);
     }
 
-    return m_videoSink.get();
+    GstElement* videoSink = nullptr;
+    if (!webkitGstCheckVersion(1, 18, 0)) {
+        m_fpsSink = makeGStreamerElement("fpsdisplaysink", "sink");
+        if (m_fpsSink) {
+            g_object_set(m_fpsSink.get(), "silent", TRUE , nullptr);
+
+            // Turn off text overlay unless tracing is enabled.
+            if (gst_debug_category_get_threshold(webkit_media_player_debug) < GST_LEVEL_TRACE)
+                g_object_set(m_fpsSink.get(), "text-overlay", FALSE , nullptr);
+
+            if (gstObjectHasProperty(m_fpsSink.get(), "video-sink")) {
+                g_object_set(m_fpsSink.get(), "video-sink", m_videoSink.get(), nullptr);
+                videoSink = m_fpsSink.get();
+            } else
+                m_fpsSink = nullptr;
+        }
+    }
+
+    if (!m_fpsSink)
+        videoSink = m_videoSink.get();
+
+    ASSERT(videoSink);
+    return videoSink;
 }
 
 void MediaPlayerPrivateGStreamer::setStreamVolumeElement(GstStreamVolume* volume)
@@ -4147,16 +4169,26 @@ bool MediaPlayerPrivateGStreamer::updateVideoSinkStatistics()
     if (!m_videoSink)
         return false;
 
+    if (!webkitGstCheckVersion(1, 18, 0) && !m_fpsSink)
+        return false;
+
     uint64_t totalVideoFrames = 0;
     uint64_t droppedVideoFrames = 0;
-    GUniqueOutPtr<GstStructure> stats;
-    g_object_get(m_videoSink.get(), "stats", &stats.outPtr(), nullptr);
+    if (webkitGstCheckVersion(1, 18, 0)) {
+        GUniqueOutPtr<GstStructure> stats;
+        g_object_get(m_videoSink.get(), "stats", &stats.outPtr(), nullptr);
 
-    if (!gst_structure_get_uint64(stats.get(), "rendered", &totalVideoFrames))
-        return false;
+        if (!gst_structure_get_uint64(stats.get(), "rendered", &totalVideoFrames))
+            return false;
 
-    if (!gst_structure_get_uint64(stats.get(), "dropped", &droppedVideoFrames))
-        return false;
+        if (!gst_structure_get_uint64(stats.get(), "dropped", &droppedVideoFrames))
+            return false;
+    } else if (m_fpsSink) {
+        unsigned renderedFrames, droppedFrames;
+        g_object_get(m_fpsSink.get(), "frames-rendered", &renderedFrames, "frames-dropped", &droppedFrames, nullptr);
+        totalVideoFrames = renderedFrames;
+        droppedVideoFrames = droppedFrames;
+    }
 
     // Caching is required so that metrics queries performed after EOS still return valid values.
     if (totalVideoFrames)
diff --git a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.h b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.h
index e0cdb0a2d01f..f33a674481e1 100644
--- a/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.h
+++ b/Source/WebCore/platform/graphics/gstreamer/MediaPlayerPrivateGStreamer.h
@@ -578,6 +578,7 @@ private:
     uint64_t m_networkReadPosition { 0 };
     mutable uint64_t m_readPositionAtLastDidLoadingProgress { 0 };
 
+    GRefPtr<GstElement> m_fpsSink { nullptr };
     uint64_t m_totalVideoFrames { 0 };
     uint64_t m_droppedVideoFrames { 0 };
     uint64_t m_decodedVideoFrames { 0 };
diff --git a/Source/cmake/GStreamerChecks.cmake b/Source/cmake/GStreamerChecks.cmake
index 5380617afc9c..8774f1d2aca8 100644
--- a/Source/cmake/GStreamerChecks.cmake
+++ b/Source/cmake/GStreamerChecks.cmake
@@ -36,7 +36,7 @@ if (ENABLE_VIDEO OR ENABLE_WEB_AUDIO)
               list(APPEND GSTREAMER_COMPONENTS webrtc)
           endif ()
 
-          find_package(GStreamer 1.18.4 REQUIRED COMPONENTS ${GSTREAMER_COMPONENTS})
+          find_package(GStreamer 1.16.2 REQUIRED COMPONENTS ${GSTREAMER_COMPONENTS})
 
           if (ENABLE_WEB_AUDIO)
               if (NOT PC_GSTREAMER_AUDIO_FOUND OR NOT PC_GSTREAMER_FFT_FOUND)
-- 
2.41.0

From 9046961d80cc168aab253e3e0eda2268bd956293 Mon Sep 17 00:00:00 2001
From: Michael Catanzaro <mcatanzaro@redhat.com>
Date: Wed, 20 Sep 2023 13:09:28 -0500
Subject: [PATCH 2/2] Revert GStreamer 1.16 dependency

This (mostly) reverts https://commits.webkit.org/256284@main
---
 .../gstreamer/GLVideoSinkGStreamer.cpp        | 20 ++++++++++++++++++-
 .../gstreamer/eme/GStreamerEMEUtilities.h     | 10 ++++++++++
 ...bKitCommonEncryptionDecryptorGStreamer.cpp |  7 +++++--
 Source/cmake/GStreamerChecks.cmake            |  2 +-
 4 files changed, 35 insertions(+), 4 deletions(-)

diff --git a/Source/WebCore/platform/graphics/gstreamer/GLVideoSinkGStreamer.cpp b/Source/WebCore/platform/graphics/gstreamer/GLVideoSinkGStreamer.cpp
index f3a51be68534..bf8ebeda1725 100644
--- a/Source/WebCore/platform/graphics/gstreamer/GLVideoSinkGStreamer.cpp
+++ b/Source/WebCore/platform/graphics/gstreamer/GLVideoSinkGStreamer.cpp
@@ -88,7 +88,25 @@ static void webKitGLVideoSinkConstructed(GObject* object)
     ASSERT(colorconvert);
     gst_bin_add_many(GST_BIN_CAST(sink), upload, colorconvert, sink->priv->appSink.get(), nullptr);
 
-    GRefPtr<GstCaps> caps = adoptGRef(gst_caps_from_string("video/x-raw, format = (string) " GST_GL_CAPS_FORMAT));
+    // Workaround until we can depend on GStreamer 1.16.2.
+    // https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/commit/8d32de090554cf29fe359f83aa46000ba658a693
+    // Forcing a color conversion to RGBA here allows glupload to internally use
+    // an uploader that adds a VideoMeta, through the TextureUploadMeta caps
+    // feature, without needing the patch above. However this specific caps
+    // feature is going to be removed from GStreamer so it is considered a
+    // short-term workaround. This code path most likely will have a negative
+    // performance impact on embedded platforms as well. Downstream embedders
+    // are highly encouraged to cherry-pick the patch linked above in their BSP
+    // and set the WEBKIT_GST_NO_RGBA_CONVERSION environment variable until
+    // GStreamer 1.16.2 is released.
+    // See also https://bugs.webkit.org/show_bug.cgi?id=201422
+    GRefPtr<GstCaps> caps;
+    if (webkitGstCheckVersion(1, 16, 2) || getenv("WEBKIT_GST_NO_RGBA_CONVERSION"))
+        caps = adoptGRef(gst_caps_from_string("video/x-raw, format = (string) " GST_GL_CAPS_FORMAT));
+    else {
+        GST_INFO_OBJECT(sink, "Forcing RGBA as GStreamer is not new enough.");
+        caps = adoptGRef(gst_caps_from_string("video/x-raw, format = (string) RGBA"));
+    }
     gst_caps_set_features(caps.get(), 0, gst_caps_features_new(GST_CAPS_FEATURE_MEMORY_GL_MEMORY, nullptr));
     g_object_set(sink->priv->appSink.get(), "caps", caps.get(), nullptr);
 
diff --git a/Source/WebCore/platform/graphics/gstreamer/eme/GStreamerEMEUtilities.h b/Source/WebCore/platform/graphics/gstreamer/eme/GStreamerEMEUtilities.h
index 6dbf6a67dfd1..184c5c3e5f77 100644
--- a/Source/WebCore/platform/graphics/gstreamer/eme/GStreamerEMEUtilities.h
+++ b/Source/WebCore/platform/graphics/gstreamer/eme/GStreamerEMEUtilities.h
@@ -61,8 +61,10 @@ public:
     const String& systemId() const { return m_systemId; }
     String payloadContainerType() const
     {
+#if GST_CHECK_VERSION(1, 16, 0)
         if (m_systemId == GST_PROTECTION_UNSPECIFIED_SYSTEM_ID ""_s)
             return "webm"_s;
+#endif
         return "cenc"_s;
     }
 
@@ -111,8 +113,10 @@ public:
     static constexpr auto s_WidevineKeySystem = "com.widevine.alpha"_s;
     static constexpr auto s_PlayReadyUUID = WEBCORE_GSTREAMER_EME_UTILITIES_PLAYREADY_UUID ""_s;
     static constexpr std::array<ASCIILiteral, 2> s_PlayReadyKeySystems = { "com.microsoft.playready"_s,  "com.youtube.playready"_s };
+#if GST_CHECK_VERSION(1, 16, 0)
     static constexpr auto s_unspecifiedUUID = GST_PROTECTION_UNSPECIFIED_SYSTEM_ID ""_s;
     static constexpr auto s_unspecifiedKeySystem = GST_PROTECTION_UNSPECIFIED_SYSTEM_ID ""_s;
+#endif
 
     static bool isClearKeyKeySystem(const String& keySystem)
     {
@@ -144,6 +148,7 @@ public:
         return equalIgnoringASCIICase(uuid, s_PlayReadyUUID);
     }
 
+#if GST_CHECK_VERSION(1, 16, 0)
     static bool isUnspecifiedKeySystem(const String& keySystem)
     {
         return equalIgnoringASCIICase(keySystem, s_unspecifiedKeySystem);
@@ -153,6 +158,7 @@ public:
     {
         return equalIgnoringASCIICase(uuid, s_unspecifiedUUID);
     }
+#endif
 
     static const char* keySystemToUuid(const String& keySystem)
     {
@@ -165,8 +171,10 @@ public:
         if (isPlayReadyKeySystem(keySystem))
             return s_PlayReadyUUID;
 
+#if GST_CHECK_VERSION(1, 16, 0)
         if (isUnspecifiedKeySystem(keySystem))
             return s_unspecifiedUUID;
+#endif
 
         ASSERT_NOT_REACHED();
         return { };
@@ -183,8 +191,10 @@ public:
         if (isPlayReadyUUID(uuid))
             return s_PlayReadyKeySystems[0];
 
+#if GST_CHECK_VERSION(1, 16, 0)
         if (isUnspecifiedUUID(uuid))
             return s_unspecifiedKeySystem;
+#endif
 
         ASSERT_NOT_REACHED();
         return ""_s;
diff --git a/Source/WebCore/platform/graphics/gstreamer/eme/WebKitCommonEncryptionDecryptorGStreamer.cpp b/Source/WebCore/platform/graphics/gstreamer/eme/WebKitCommonEncryptionDecryptorGStreamer.cpp
index 0cde37e1f83f..a7bbf7fc569c 100644
--- a/Source/WebCore/platform/graphics/gstreamer/eme/WebKitCommonEncryptionDecryptorGStreamer.cpp
+++ b/Source/WebCore/platform/graphics/gstreamer/eme/WebKitCommonEncryptionDecryptorGStreamer.cpp
@@ -171,8 +171,11 @@ static GstCaps* transformCaps(GstBaseTransform* base, GstPadDirection direction,
 
                 // GST_PROTECTION_UNSPECIFIED_SYSTEM_ID was added in the GStreamer
                 // developement git master which will ship as version 1.16.0.
-                gst_structure_set_name(outgoingStructure.get(), !g_strcmp0(klass->protectionSystemId(self),
-                    GST_PROTECTION_UNSPECIFIED_SYSTEM_ID) ? "application/x-webm-enc" : "application/x-cenc");
+                gst_structure_set_name(outgoingStructure.get(),
+#if GST_CHECK_VERSION(1, 16, 0)
+                    !g_strcmp0(klass->protectionSystemId(self), GST_PROTECTION_UNSPECIFIED_SYSTEM_ID) ? "application/x-webm-enc" :
+#endif
+                    "application/x-cenc");
             }
         }
 
diff --git a/Source/cmake/GStreamerChecks.cmake b/Source/cmake/GStreamerChecks.cmake
index 8774f1d2aca8..d43093ec7824 100644
--- a/Source/cmake/GStreamerChecks.cmake
+++ b/Source/cmake/GStreamerChecks.cmake
@@ -36,7 +36,7 @@ if (ENABLE_VIDEO OR ENABLE_WEB_AUDIO)
               list(APPEND GSTREAMER_COMPONENTS webrtc)
           endif ()
 
-          find_package(GStreamer 1.16.2 REQUIRED COMPONENTS ${GSTREAMER_COMPONENTS})
+          find_package(GStreamer 1.14.0 REQUIRED COMPONENTS ${GSTREAMER_COMPONENTS})
 
           if (ENABLE_WEB_AUDIO)
               if (NOT PC_GSTREAMER_AUDIO_FOUND OR NOT PC_GSTREAMER_FFT_FOUND)
-- 
2.41.0