vf_hqx.c File Reference

hqx magnification filters (hq2x, hq3x, hq4x) More...

#include "libavutil/opt.h"
#include "libavutil/avassert.h"
#include "libavutil/pixdesc.h"
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	HQXContext
struct	ThreadData

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	query_formats (AVFilterContext *ctx)
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 []
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

#define OFFSET

(

x

)

offsetof(HQXContext, x)

Definition at line 49 of file vf_hqx.c.

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 50 of file vf_hqx.c.

#define YMASK   0xff0000

Referenced by yuv_diff().

#define UMASK   0x00ff00

Referenced by yuv_diff().

#define VMASK   0x0000ff

Referenced by yuv_diff().

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

Referenced by yuv_diff().

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

Definition at line 92 of file vf_hqx.c.

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

#define DROP4

(

z

)

((z) > 4 ? (z)-1 : (z))

Definition at line 96 of file vf_hqx.c.

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

Definition at line 99 of file vf_hqx.c.

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

Definition at line 102 of file vf_hqx.c.

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

#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 107 of file vf_hqx.c.

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

#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 453 of file vf_hqx.c.

Typedef Documentation

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

Definition at line 35 of file vf_hqx.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

hqx

)

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

static

Definition at line 58 of file vf_hqx.c.

Referenced by hqx_filter().

static av_always_inline int yuv_diff ( uint32_t  yuv1, uint32_t  yuv2  )

static

Definition at line 63 of file vf_hqx.c.

Referenced by hqx_filter().

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

static

Definition at line 76 of file vf_hqx.c.

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

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 83 of file vf_hqx.c.

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

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 119 of file vf_hqx.c.

Referenced by hqx_filter().

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 169 of file vf_hqx.c.

Referenced by hqx_filter().

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 235 of file vf_hqx.c.

Referenced by hqx_filter().

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

static

Definition at line 383 of file vf_hqx.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 464 of file vf_hqx.c.

static int config_output ( AVFilterLink *  outlink )

static

Definition at line 473 of file vf_hqx.c.

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

static

Definition at line 487 of file vf_hqx.c.

static av_cold int init ( AVFilterContext *  ctx )

static

Definition at line 511 of file vf_hqx.c.

Variable Documentation

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 51 of file vf_hqx.c.

const AVFilterPad hqx_inputs[]

static

Initial value:

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

Definition at line 538 of file vf_hqx.c.

const AVFilterPad hqx_outputs[]

static

Initial value:

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

Definition at line 547 of file vf_hqx.c.

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,
    .query_formats = query_formats,
    .inputs        = hqx_inputs,
    .outputs       = hqx_outputs,
    .priv_class    = &hqx_class,
    .flags         = AVFILTER_FLAG_SLICE_THREADS,
}

Definition at line 556 of file vf_hqx.c.