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gl: Reset video frame size/stride/offset to 0 for GL mapped frames

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The memory pointers are actually the GL texture IDs, and accessing them
like raw video memory will read random memory areas.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1173>
This commit is contained in:
Sebastian Dröge 2022-12-22 21:12:35 +02:00 committed by GStreamer Marge Bot
parent d6cc452cf3
commit dcfea9c35a
2 changed files with 20 additions and 10 deletions
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1
gstreamer-gl/Cargo.toml
View file

@ -18,7 +18,6 @@ rust-version = "1.63"
[dependencies] [dependencies]
bitflags = "1.0" bitflags = "1.0"
byteorder = "1"
libc = "0.2" libc = "0.2"
once_cell = "1.0" once_cell = "1.0"
ffi = { package = "gstreamer-gl-sys", path = "sys" } ffi = { package = "gstreamer-gl-sys", path = "sys" }

29
gstreamer-gl/src/gl_video_frame.rs
View file

@ -3,7 +3,6 @@
use glib::translate::{from_glib, ToGlibPtr}; use glib::translate::{from_glib, ToGlibPtr};
use gst_video::video_frame::Readable; use gst_video::video_frame::Readable;
use byteorder::{NativeEndian, ReadBytesExt};
use std::mem; use std::mem;
pub trait VideoFrameGLExt { pub trait VideoFrameGLExt {
@ -76,7 +75,14 @@ impl<'a> VideoFrameGLExt for gst_video::VideoFrameRef<&'a gst::BufferRef> {
if !res { if !res {
Err(buffer) Err(buffer)
} else { } else {
Ok(gst_video::VideoFrame::from_glib_full(frame.assume_init())) let mut frame = frame.assume_init();
// Reset size/stride/offset to 0 as the memory pointers
// are the GL texture ID and accessing them would read
// random memory.
frame.info.size = 0;
frame.info.stride.fill(0);
frame.info.offset.fill(0);
Ok(gst_video::VideoFrame::from_glib_full(frame))
} }
} }
} }
@ -117,9 +123,14 @@ impl<'a> VideoFrameGLExt for gst_video::VideoFrameRef<&'a gst::BufferRef> {
"Failed to fill in the values of GstVideoFrame" "Failed to fill in the values of GstVideoFrame"
)) ))
} else { } else {
Ok(gst_video::VideoFrameRef::from_glib_full( let mut frame = frame.assume_init();
frame.assume_init(), // Reset size/stride/offset to 0 as the memory pointers
)) // are the GL texture ID and accessing them would read
// random memory.
frame.info.size = 0;
frame.info.stride.fill(0);
frame.info.offset.fill(0);
Ok(gst_video::VideoFrameRef::from_glib_full(frame))
} }
} }
} }
@ -136,10 +147,10 @@ impl<'a> VideoFrameGLExt for gst_video::VideoFrameRef<&'a gst::BufferRef> {
return None; return None;
} }
let mut data = self.plane_data(idx).ok()?; unsafe {
let id = &data.read_u32::<NativeEndian>().ok()?; let ptr = (*self.as_ptr()).data[idx as usize] as *const u32;
Some(*ptr)
Some(*id) }
} }
} }