#include "libavutil/opt.h"
#include "libavutil/avassert.h"
#include "libavutil/pixdesc.h"
#include "filters.h"
#include "video.h"

Data Structures
struct	HQXContext

struct	ThreadData
	Used for passing data between threads. More...

Macros
#define	OFFSET(x) offsetof(HQXContext, x)

#define	FLAGS AV_OPT_FLAG_FILTERING_PARAM\|AV_OPT_FLAG_VIDEO_PARAM

#define	YMASK 0xff0000

#define	UMASK 0x00ff00

#define	VMASK 0x0000ff

#define	ABSDIFF(a, b) (abs((int)(a)-(int)(b)))

#define	P(m, r) ((k_shuffled & (m)) == (r))

#define	DROP4(z) ((z) > 4 ? (z)-1 : (z))

#define	SHF(x, rot, n) (((x) >> ((rot) ? 7-DROP4(n) : DROP4(n)) & 1) << DROP4(p##n))

#define	WDIFF(c1, c2) yuv_diff(rgb2yuv(r2y, c1), rgb2yuv(r2y, c2))

#define	INTERP_BOOTSTRAP(rot)

#define	HQX_FUNC(size)

Typedefs
typedef int(*	hqxfunc_t) (AVFilterContext ctx, void arg, int jobnr, int nb_jobs)

Functions
	AVFILTER_DEFINE_CLASS (hqx)

static av_always_inline uint32_t	rgb2yuv (const uint32_t *r2y, uint32_t c)

static av_always_inline int	yuv_diff (uint32_t yuv1, uint32_t yuv2)

static av_always_inline uint32_t	interp_2px (uint32_t c1, int w1, uint32_t c2, int w2, int s)

static av_always_inline uint32_t	interp_3px (uint32_t c1, int w1, uint32_t c2, int w2, uint32_t c3, int w3, int s)

static av_always_inline uint32_t	hq2x_interp_1x1 (const uint32_t r2y, int k, const uint32_t w, int p0, int p1, int p2, int p3, int p4, int p5, int p6, int p7, int p8)

static av_always_inline void	hq3x_interp_2x1 (uint32_t dst, int dst_linesize, const uint32_t r2y, int k, const uint32_t *w, int pos00, int pos01, int p0, int p1, int p2, int p3, int p4, int p5, int p6, int p7, int p8, int rotate)

static av_always_inline void	hq4x_interp_2x2 (uint32_t dst, int dst_linesize, const uint32_t r2y, int k, const uint32_t *w, int pos00, int pos01, int pos10, int pos11, int p0, int p1, int p2, int p3, int p4, int p5, int p6, int p7, int p8)

static av_always_inline void	hqx_filter (const ThreadData *td, int jobnr, int nb_jobs, int n)

static int	config_output (AVFilterLink *outlink)

static int	filter_frame (AVFilterLink inlink, AVFrame in)

static av_cold int	init (AVFilterContext *ctx)

Variables
static const AVOption	hqx_options []

static const AVFilterPad	hqx_inputs []

static const AVFilterPad	hqx_outputs []

const AVFilter	ff_vf_hqx

Detailed Description

hqx magnification filters (hq2x, hq3x, hq4x)

Originally designed by Maxim Stephin.

See also: http://en.wikipedia.org/wiki/Hqx; http://web.archive.org/web/20131114143602/http://www.hiend3d.com/hq3x.html; http://blog.pkh.me/p/19-butchering-hqx-scaling-filters.html

Definition in file vf_hqx.c.

Macro Definition Documentation

◆ OFFSET

#define OFFSET ( x ) offsetof(HQXContext, x)

Definition at line 50 of file vf_hqx.c.

◆ FLAGS

#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 51 of file vf_hqx.c.

◆ YMASK

#define YMASK 0xff0000

◆ UMASK

#define UMASK 0x00ff00

◆ VMASK

#define VMASK 0x0000ff

◆ ABSDIFF

#define ABSDIFF	(	a,
		b
	)	(abs((int)(a)-(int)(b)))

◆ P

#define P	(	m,
		r
	)	((k_shuffled & (m)) == (r))

Definition at line 93 of file vf_hqx.c.

◆ DROP4

#define DROP4 ( z ) ((z) > 4 ? (z)-1 : (z))

Definition at line 97 of file vf_hqx.c.

◆ SHF

#define SHF	(	x,
		rot,
		n
	)	(((x) >> ((rot) ? 7-DROP4(n) : DROP4(n)) & 1) << DROP4(p##n))

Definition at line 100 of file vf_hqx.c.

◆ WDIFF

#define WDIFF	(	c1,
		c2
	)	yuv_diff(rgb2yuv(r2y, c1), rgb2yuv(r2y, c2))

Definition at line 103 of file vf_hqx.c.

◆ INTERP_BOOTSTRAP

#define INTERP_BOOTSTRAP ( rot )

Value:

    const int k_shuffled = SHF(k,rot,0) | SHF(k,rot,1) | SHF(k,rot,2)   \
                         | SHF(k,rot,3) |       0      | SHF(k,rot,5)   \
                         | SHF(k,rot,6) | SHF(k,rot,7) | SHF(k,rot,8);  \
                                                                        \
    const uint32_t w0 = w[p0], w1 = w[p1],                              \
                   w3 = w[p3], w4 = w[p4], w5 = w[p5],                  \
                               w7 = w[p7]

Definition at line 108 of file vf_hqx.c.

◆ HQX_FUNC

#define HQX_FUNC ( size )

Value:

static int hq##size##x(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs) \
{ \
    hqx_filter(arg, jobnr, nb_jobs, size); \
    return 0; \
}

Definition at line 454 of file vf_hqx.c.

Typedef Documentation

◆ hqxfunc_t

typedef int(* hqxfunc_t) (AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)

Definition at line 36 of file vf_hqx.c.

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS ( hqx )

◆ rgb2yuv()

static av_always_inline uint32_t rgb2yuv	(	const uint32_t *	r2y,
		uint32_t	c
	)

static

Definition at line 59 of file vf_hqx.c.

Referenced by hqx_filter().

◆ yuv_diff()

static av_always_inline int yuv_diff	(	uint32_t	yuv1,
		uint32_t	yuv2
	)

static

Definition at line 64 of file vf_hqx.c.

Referenced by hqx_filter().

◆ interp_2px()

static av_always_inline uint32_t interp_2px	(	uint32_t	c1,
		int	w1,
		uint32_t	c2,
		int	w2,
		int	s
	)

static

Definition at line 77 of file vf_hqx.c.

Referenced by hq2x_interp_1x1(), hq3x_interp_2x1(), and hq4x_interp_2x2().

◆ interp_3px()

static av_always_inline uint32_t interp_3px	(	uint32_t	c1,
		int	w1,
		uint32_t	c2,
		int	w2,
		uint32_t	c3,
		int	w3,
		int	s
	)

static

Definition at line 84 of file vf_hqx.c.

Referenced by hq2x_interp_1x1(), hq3x_interp_2x1(), and hq4x_interp_2x2().

◆ hq2x_interp_1x1()

static av_always_inline uint32_t hq2x_interp_1x1	(	const uint32_t *	r2y,
		int	k,
		const uint32_t *	w,
		int	p0,
		int	p1,
		int	p2,
		int	p3,
		int	p4,
		int	p5,
		int	p6,
		int	p7,
		int	p8
	)

static

Definition at line 120 of file vf_hqx.c.

Referenced by hqx_filter().

◆ hq3x_interp_2x1()

static av_always_inline void hq3x_interp_2x1	(	uint32_t *	dst,
		int	dst_linesize,
		const uint32_t *	r2y,
		int	k,
		const uint32_t *	w,
		int	pos00,
		int	pos01,
		int	p0,
		int	p1,
		int	p2,
		int	p3,
		int	p4,
		int	p5,
		int	p6,
		int	p7,
		int	p8,
		int	rotate
	)

static

Definition at line 170 of file vf_hqx.c.

Referenced by hqx_filter().

◆ hq4x_interp_2x2()

static av_always_inline void hq4x_interp_2x2	(	uint32_t *	dst,
		int	dst_linesize,
		const uint32_t *	r2y,
		int	k,
		const uint32_t *	w,
		int	pos00,
		int	pos01,
		int	pos10,
		int	pos11,
		int	p0,
		int	p1,
		int	p2,
		int	p3,
		int	p4,
		int	p5,
		int	p6,
		int	p7,
		int	p8
	)

static

Definition at line 236 of file vf_hqx.c.

Referenced by hqx_filter().

◆ hqx_filter()

static av_always_inline void hqx_filter	(	const ThreadData *	td,
		int	jobnr,
		int	nb_jobs,
		int	n
	)

static

Definition at line 384 of file vf_hqx.c.

◆ config_output()

static int config_output ( AVFilterLink * outlink )

static

Definition at line 465 of file vf_hqx.c.

◆ filter_frame()

static int filter_frame	(	AVFilterLink *	inlink,
		AVFrame *	in
	)

static

Definition at line 479 of file vf_hqx.c.

◆ init()

static av_cold int init ( AVFilterContext * ctx )

static

Definition at line 504 of file vf_hqx.c.

Variable Documentation

◆ hqx_options

const AVOption hqx_options[]

static

Initial value:

= {
    { "n", "set scale factor", OFFSET(n), AV_OPT_TYPE_INT, {.i64 = 3}, 2, 4, .flags = FLAGS },
    { NULL }
}

Definition at line 52 of file vf_hqx.c.

◆ hqx_inputs

const AVFilterPad hqx_inputs[]

static

Initial value:

= {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .filter_frame = filter_frame,
    },
}

Definition at line 531 of file vf_hqx.c.

◆ hqx_outputs

const AVFilterPad hqx_outputs[]

static

Initial value:

= {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .config_props = config_output,
    },
}

Definition at line 539 of file vf_hqx.c.

◆ ff_vf_hqx

const AVFilter ff_vf_hqx

Initial value:

= {
    .name          = "hqx",
    .description   = NULL_IF_CONFIG_SMALL("Scale the input by 2, 3 or 4 using the hq*x magnification algorithm."),
    .priv_size     = sizeof(HQXContext),
    .init          = init,
    FILTER_INPUTS(hqx_inputs),
    FILTER_OUTPUTS(hqx_outputs),
    FILTER_SINGLE_PIXFMT(AV_PIX_FMT_RGB32),
    .priv_class    = &hqx_class,
    .flags         = AVFILTER_FLAG_SLICE_THREADS,
}

Definition at line 547 of file vf_hqx.c.

Data Structures

Macros

Typedefs

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ OFFSET

◆ FLAGS

◆ YMASK

◆ UMASK

◆ VMASK

◆ ABSDIFF

◆ P

◆ DROP4

◆ SHF

◆ WDIFF

◆ INTERP_BOOTSTRAP

◆ HQX_FUNC

Typedef Documentation

◆ hqxfunc_t

Function Documentation

◆ AVFILTER_DEFINE_CLASS()

◆ rgb2yuv()

◆ yuv_diff()

◆ interp_2px()

◆ interp_3px()

◆ hq2x_interp_1x1()

◆ hq3x_interp_2x1()

◆ hq4x_interp_2x2()

◆ hqx_filter()

◆ config_output()

◆ filter_frame()

◆ init()

Variable Documentation

◆ hqx_options

◆ hqx_inputs

◆ hqx_outputs

◆ ff_vf_hqx