1 files changed, 87 insertions, 0 deletions
diff --git a/third_party/libwebrtc/moz-patch-stack/0027.patch b/third_party/libwebrtc/moz-patch-stack/0027.patch
new file mode 100644
index 0000000000..f7b3a22adf
--- /dev/null
+++ b/third_party/libwebrtc/moz-patch-stack/0027.patch
@@ -0,0 +1,87 @@
+From: Dan Minor <dminor@mozilla.com>
+Date: Wed, 8 Jul 2020 17:35:00 +0000
+Subject: Bug 1650572 - Check V4L2_CAP_DEVICE_CAPS before accessing
+ device_caps; r=ng
+
+The capabilities field is for the physical device, device_caps is for the
+specific /dev/videoX device that has been opened. The device_caps field is
+only populated if V4L2_CAP_DEVICE_CAPS is set, so we should check that, and
+fall back to capabilities if it is not set.
+
+Differential Revision: https://phabricator.services.mozilla.com/D82377
+Mercurial Revision: https://hg.mozilla.org/mozilla-central/rev/b5acbf536c46a66c939a61bde34ad93b1977a604
+---
+ modules/video_capture/linux/device_info_v4l2.cc | 17 ++++++++++++-----
+ modules/video_capture/linux/device_info_v4l2.h  |  3 +++
+ 2 files changed, 15 insertions(+), 5 deletions(-)
+
+diff --git a/modules/video_capture/linux/device_info_v4l2.cc b/modules/video_capture/linux/device_info_v4l2.cc
+index a2435bcd4f..cd0ba6e3df 100644
+--- a/modules/video_capture/linux/device_info_v4l2.cc
++++ b/modules/video_capture/linux/device_info_v4l2.cc
+@@ -220,8 +220,7 @@ uint32_t DeviceInfoV4l2::NumberOfDevices() {
+     snprintf(device, sizeof(device), "/dev/video%d", n);
+     if ((fd = open(device, O_RDONLY)) != -1) {
+       // query device capabilities and make sure this is a video capture device
+-      if (ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0 ||
+-          !(cap.device_caps & V4L2_CAP_VIDEO_CAPTURE)) {
++      if (ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0 || !IsVideoCaptureDevice(&cap)) {
+         close(fd);
+         continue;
+       }
+@@ -252,8 +251,7 @@ int32_t DeviceInfoV4l2::GetDeviceName(uint32_t deviceNumber,
+     snprintf(device, sizeof(device), "/dev/video%d", n);
+     if ((fd = open(device, O_RDONLY)) != -1) {
+       // query device capabilities and make sure this is a video capture device
+-      if (ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0 ||
+-          !(cap.device_caps & V4L2_CAP_VIDEO_CAPTURE)) {
++      if (ioctl(fd, VIDIOC_QUERYCAP, &cap) < 0 || !IsVideoCaptureDevice(&cap)) {
+         close(fd);
+         continue;
+       }
+@@ -331,7 +329,7 @@ int32_t DeviceInfoV4l2::CreateCapabilityMap(const char* deviceUniqueIdUTF8) {
+     struct v4l2_capability cap;
+     if (ioctl(fd, VIDIOC_QUERYCAP, &cap) == 0) {
+       // skip devices without video capture capability
+-      if (!(cap.device_caps & V4L2_CAP_VIDEO_CAPTURE)) {
++      if (!IsVideoCaptureDevice(&cap)) {
+         continue;
+       }
+ 
+@@ -393,6 +391,15 @@ bool DeviceInfoV4l2::IsDeviceNameMatches(const char* name,
+   return false;
+ }
+ 
++bool DeviceInfoV4l2::IsVideoCaptureDevice(struct v4l2_capability* cap)
++{
++  if (cap->capabilities & V4L2_CAP_DEVICE_CAPS) {
++    return cap->device_caps & V4L2_CAP_VIDEO_CAPTURE;
++  } else {
++    return cap->capabilities & V4L2_CAP_VIDEO_CAPTURE;
++  }
++}
++
+ int32_t DeviceInfoV4l2::FillCapabilities(int fd) {
+   // set image format
+   struct v4l2_format video_fmt;
+diff --git a/modules/video_capture/linux/device_info_v4l2.h b/modules/video_capture/linux/device_info_v4l2.h
+index 95432a509d..e3c2395f49 100644
+--- a/modules/video_capture/linux/device_info_v4l2.h
++++ b/modules/video_capture/linux/device_info_v4l2.h
+@@ -18,6 +18,8 @@
+ #include "rtc_base/platform_thread.h"
+ #include <sys/inotify.h>
+ 
++struct v4l2_capability;
++
+ namespace webrtc {
+ namespace videocapturemodule {
+ class DeviceInfoV4l2 : public DeviceInfoImpl {
+@@ -49,6 +51,7 @@ class DeviceInfoV4l2 : public DeviceInfoImpl {
+ 
+  private:
+   bool IsDeviceNameMatches(const char* name, const char* deviceUniqueIdUTF8);
++  bool IsVideoCaptureDevice(struct v4l2_capability* cap);
+ 
+ #ifdef WEBRTC_LINUX
+   void HandleEvent(inotify_event* event, int fd);