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Old 6th June 2016, 03:10   #1  |  Link
Stephen R. Savage
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Join Date: Nov 2009
Posts: 345
C++ API for VapourSynth

Do you miss the AviSynth plugin API? Can't remember the signatures for all those VSAPI plugin callbacks? Dealing with optional filter arguments got you down? Memory leaks driving you crazy? Try VapourSynth++.

Consider the SDK invert example with VS++:

Code:
#include <stdexcept>
#include "vsxx_pluginmain.h"

using namespace vsxx;

class InvertFilter : public FilterBase {
	FilterNode m_node;
	VSVideoInfo m_vi;
	bool m_enabled;
public:
	InvertFilter(void * = nullptr) : m_vi(), m_enabled{} {}

	const char *get_name(int) noexcept override
	{
		return "Invert";
	}

	std::pair<VSFilterMode, int> init(const ConstPropertyMap &in, const PropertyMap &out, const VapourCore &core)
	{
		m_node = in.get_prop<FilterNode>("clip");
		m_vi = m_node.video_info();
		m_enabled = in.get_prop<bool>("enabled", map::default_val(true));

		if (!m_vi.format || m_vi.format->sampleType != stInteger || m_vi.format->bitsPerSample != 8)
			throw std::runtime_error{ "clip must be 8-bit integer" };

		return{ fmParallel, 0 };
	}

	std::pair<const VSVideoInfo *, size_t> get_video_info() noexcept override
	{
		return{ &m_vi, 1 };
	}

	void get_frame_initial(int n, const VapourCore &, VSFrameContext *frame_ctx) override
	{
		m_node.request_frame_filter(n, frame_ctx);
	}

	ConstVideoFrame get_frame(int n, const VapourCore &core, VSFrameContext *frame_ctx) override
	{
		ConstVideoFrame src = m_node.get_frame_filter(n, frame_ctx);

		if (!m_enabled)
			return src;

		const VSFormat &format = src.format();
		VideoFrame dst = core.new_video_frame(format, src.width(0), src.height(0));

		for (int p = 0; p < format.numPlanes; ++p) {
			const uint8_t *src_p = src.read_ptr(p);
			uint8_t *dst_p = dst.write_ptr(p);

			int src_stride = src.stride(p);
			int dst_stride = dst.stride(p);
			int w = src.width(p);
			int h = src.height(p);

			for (int i = 0; i < h; ++i) {
				for (int j = 0; j < w; ++j) {
					dst_p[j] = ~src_p[j];
				}
				src_p += src_stride;
				dst_p += dst_stride;
			}
		}
		return dst;
	}
};

const PluginInfo g_plugin_info = {
	"com.example.invert", "invert", "VapourSynth Invert Example", {
		{ &FilterBase::filter_create<InvertFilter>, "Invert", "clip:clip;enabled:int:opt;" }
	}
};
VS++ eliminates boilerplate and lets you focus on your algorithm.

Download: CatHub

Last edited by Stephen R. Savage; 6th June 2016 at 18:42.
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