rafaelcaricio/gstreamer-rs
1
0
Fork 0
forked from mirrors/gstreamer-rs
Code Pull requests Activity

examples/appsrc: Make use of the VideoFrame API for accessing the data

Browse source 
This is not really needed here but useful to have an example for the
videoframe API usage.
This commit is contained in:
Sebastian Dröge 2020-10-03 17:55:36 +03:00
parent b59b5ada7e
commit 9379098a3f
1 changed files with 24 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

31
examples/src/bin/appsrc.rs
View file

@ -107,14 +107,31 @@ fn create_pipeline() -> Result<gst::Pipeline, Error> {
// When we want to access its content, we have to map it while requesting the required
// mode of access (read, read/write).
// See: https://gstreamer.freedesktop.org/documentation/plugin-development/advanced/allocation.html
let mut data = buffer.map_writable().unwrap();
let mut vframe =
gst_video::VideoFrameRef::from_buffer_ref_writable(buffer, &video_info)
.unwrap();
for p in data.as_mut_slice().chunks_mut(4) {
assert_eq!(p.len(), 4);
p[0] = b;
p[1] = g;
p[2] = r;
p[3] = 0;
// Remember some values from the frame for later usage
let width = vframe.width() as usize;
let height = vframe.height() as usize;
// Each line of the first plane has this many bytes
let stride = vframe.plane_stride()[0] as usize;
// Iterate over each of the height many lines of length stride
for line in vframe
.plane_data_mut(0)
.unwrap()
.chunks_exact_mut(stride)
.take(height)
{
// Iterate over each pixel of 4 bytes in that line
for pixel in line[..(4 * width)].chunks_exact_mut(4) {
pixel[0] = b;
pixel[1] = g;
pixel[2] = r;
pixel[3] = 0;
}
}
}