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 "filters.h"
#include "video.h"

Go to the source code of this file.

Data Structures
struct	HQXContext
struct	ThreadData
	Used for passing data between threads. More...

Macros
#define	OFFSET(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)
#define	P(m, r)
#define	DROP4(z)
#define	SHF(x, rot, n)
#define	WDIFF(c1, 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 FFFilter	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

)

Value:

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

Referenced by pixel_diff(), and yuv_diff().

UMASK

#define UMASK   0x00ff00

Referenced by pixel_diff(), and yuv_diff().

VMASK

#define VMASK   0x0000ff

Referenced by pixel_diff(), and yuv_diff().

ABSDIFF

#define ABSDIFF	(		a,
			b )

Value:

(abs((int)(a)-(int)(b)))

Referenced by yuv_diff().

P

#define P	(		m,
			r )

Value:

((k_shuffled & (m)) == (r))

Definition at line 93 of file vf_hqx.c.

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

DROP4

#define DROP4

(

z

)

Value:

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

Definition at line 97 of file vf_hqx.c.

SHF

#define SHF	(		x,
			rot,
			n )

Value:

(((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 )

Value:

yuv_diff(rgb2yuv(r2y, c1), rgb2yuv(r2y, c2))

Definition at line 103 of file vf_hqx.c.

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

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.

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

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 FFFilter ff_vf_hqx

Initial value:

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

Definition at line 547 of file vf_hqx.c.