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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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1cf3cae5e1
Add an element that converts AYUV video frames to a DVB subpicture stream. It's fairly simple for now. Later it would be good to support input via a stream that contains only GstVideoOverlayComposition meta. The element searches each input video frame for the largest sub-region containing non-transparent pixels and encodes that as a single DVB subpicture region. It can also do palette reduction of the input frames using code taken from libimagequant. There are various FIXME for potential improvements for now, but it works. Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/1227>
19 lines
933 B
C
19 lines
933 B
C
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#ifndef VITER_H
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#define VITER_H
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// Spread memory touched by different threads at least 64B apart which I assume is the cache line size. This should avoid memory write contention.
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#define VITER_CACHE_LINE_GAP ((64+sizeof(viter_state)-1)/sizeof(viter_state))
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typedef struct {
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double a, r, g, b, total;
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} viter_state;
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typedef void (*viter_callback)(hist_item *item, float diff);
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LIQ_PRIVATE void viter_init(const colormap *map, const unsigned int max_threads, viter_state state[]);
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LIQ_PRIVATE void viter_update_color(const f_pixel acolor, const float value, const colormap *map, unsigned int match, const unsigned int thread, viter_state average_color[]);
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LIQ_PRIVATE void viter_finalize(colormap *map, const unsigned int max_threads, const viter_state state[]);
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LIQ_PRIVATE double viter_do_iteration(histogram *hist, colormap *const map, const float min_opaque_val, viter_callback callback, const bool fast_palette);
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#endif
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