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From: Dan Minor <dminor@mozilla.com>
Date: Fri, 29 Mar 2019 18:43:00 +0000
Subject: Bug 1539220 - Prefer non-RGB24 capabilities when available;
 r=pehrsons

We've hit a number of problems with handling of RGB24 video capture on
Windows. This adds a check that will ignore any RGB24 capture capabilities
when determining a best match if there are other capabilities available to
workaround the problems.

Differential Revision: https://phabricator.services.mozilla.com/D25449
Mercurial Revision: https://hg.mozilla.org/mozilla-central/rev/c12307f3817bec87712ab5930493c3135c76b0a0
---
 modules/video_capture/device_info_impl.cc | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/modules/video_capture/device_info_impl.cc b/modules/video_capture/device_info_impl.cc
index 7cccdb51a7..2a6afb3147 100644
--- a/modules/video_capture/device_info_impl.cc
+++ b/modules/video_capture/device_info_impl.cc
@@ -100,10 +100,23 @@ int32_t DeviceInfoImpl::GetBestMatchedCapability(
   const int32_t numberOfCapabilies =
       static_cast<int32_t>(_captureCapabilities.size());
 
+  bool hasNonRGB24Capability = false;
   for (int32_t tmp = 0; tmp < numberOfCapabilies;
        ++tmp)  // Loop through all capabilities
   {
     VideoCaptureCapability& capability = _captureCapabilities[tmp];
+    if (capability.videoType != VideoType::kRGB24) {
+      hasNonRGB24Capability = true;
+    }
+  }
+
+  for (int32_t tmp = 0; tmp < numberOfCapabilies;
+       ++tmp)  // Loop through all capabilities
+  {
+    VideoCaptureCapability& capability = _captureCapabilities[tmp];
+    if (hasNonRGB24Capability && capability.videoType == VideoType::kRGB24) {
+      continue;
+    }
 
     const int32_t diffWidth = capability.width - requested.width;
     const int32_t diffHeight = capability.height - requested.height;
-- 
2.34.1