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

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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
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31
examples/src/bin/appsrc.rs
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@ -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 // When we want to access its content, we have to map it while requesting the required
// mode of access (read, read/write). // mode of access (read, read/write).
// See: https://gstreamer.freedesktop.org/documentation/plugin-development/advanced/allocation.html // 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) { // Remember some values from the frame for later usage
assert_eq!(p.len(), 4); let width = vframe.width() as usize;
p[0] = b; let height = vframe.height() as usize;
p[1] = g;
p[2] = r; // Each line of the first plane has this many bytes
p[3] = 0; 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;
}
} }
} }