vf_mcdeint.c File Reference

Motion Compensation Deinterlacer Ported from MPlayer libmpcodecs/vf_mcdeint.c. More...

#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavcodec/avcodec.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"

Go to the source code of this file.

Data Structures
struct	MCDeintContext

Macros
#define	OFFSET(x)   offsetof(MCDeintContext, x)
#define	FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
#define	CONST(name, help, val, unit)   { name, help, 0, AV_OPT_TYPE_CONST, {.i64=val}, INT_MIN, INT_MAX, FLAGS, unit }
#define	DELTA(j)   av_clip(j, -x, w-1-x)
#define	GET_SCORE_EDGE(j)
#define	GET_SCORE(j)
#define	CHECK_EDGE(j)
#define	CHECK(j)

Enumerations
enum	MCDeintMode {   MODE_FAST = 0, MODE_MEDIUM, MODE_SLOW, MODE_EXTRA_SLOW,   MODE_NB }
enum	MCDeintParity { PARITY_TFF = 0, PARITY_BFF = 1 }

Functions
	AVFILTER_DEFINE_CLASS (mcdeint)
static int	config_props (AVFilterLink *inlink)
static av_cold void	uninit (AVFilterContext *ctx)
static int	query_formats (AVFilterContext *ctx)
static int	filter_frame (AVFilterLink *inlink, AVFrame *inpic)
	CHECK (-1) CHECK(-2)}}}}CHECK(1) CHECK(2)}}}}}if(diff0+diff1 > 0) temp-
	for (y=0;y< h;y++)
	if (ret< 0)
return	ff_filter_frame (outlink, outpic)

Variables
static const AVOption	mcdeint_options []
else int	spatial_score = GET_SCORE(0) - 1
else	temp = (diff0 + diff1 + FFABS(FFABS(diff0) - FFABS(diff1)) / 2) / 2
*	filp = *dstp = temp > 255U ? ~(temp>>31) : temp
	else
mcdeint	parity = 1
end	__pad0__
av_frame_free &	inpic
static const AVFilterPad	mcdeint_inputs []
static const AVFilterPad	mcdeint_outputs []
AVFilter	ff_vf_mcdeint

Detailed Description

Motion Compensation Deinterlacer Ported from MPlayer libmpcodecs/vf_mcdeint.c.

Known Issues:

The motion estimation is somewhat at the mercy of the input, if the input frames are created purely based on spatial interpolation then for example a thin black line or another random and not interpolateable pattern will cause problems. Note: completely ignoring the "unavailable" lines during motion estimation did not look any better, so the most obvious solution would be to improve tfields or penalize problematic motion vectors.

If non iterative ME is used then snow currently ignores the OBMC window and as a result sometimes creates artifacts.

Only past frames are used, we should ideally use future frames too, something like filtering the whole movie in forward and then backward direction seems like a interesting idea but the current filter framework is FAR from supporting such things.

Combining the motion compensated image with the input image also is not as trivial as it seems, simple blindly taking even lines from one and odd ones from the other does not work at all as ME/MC sometimes has nothing in the previous frames which matches the current. The current algorithm has been found by trial and error and almost certainly can be improved...

Definition in file vf_mcdeint.c.

Macro Definition Documentation

#define OFFSET

(

x

)

offsetof(MCDeintContext, x)

Definition at line 78 of file vf_mcdeint.c.

#define FLAGS   AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM

Definition at line 79 of file vf_mcdeint.c.

#define CONST	(		name,
			help,
			val,
			unit
	)		{ name, help, 0, AV_OPT_TYPE_CONST, {.i64=val}, INT_MIN, INT_MAX, FLAGS, unit }

Definition at line 80 of file vf_mcdeint.c.

#define DELTA

(

j

)

av_clip(j, -x, w-1-x)

#define GET_SCORE_EDGE

(

j

)

Value:

FFABS(srcp[-srcs+DELTA(-1+(j))] - srcp[+srcs+DELTA(-1-(j))])+\
   FFABS(srcp[-srcs+DELTA(j)     ] - srcp[+srcs+DELTA(  -(j))])+\
   FFABS(srcp[-srcs+DELTA(1+(j)) ] - srcp[+srcs+DELTA( 1-(j))])

Referenced by filter_frame().

#define GET_SCORE

(

j

)

Value:

FFABS(srcp[-srcs-1+(j)] - srcp[+srcs-1-(j)])+\
   FFABS(srcp[-srcs  +(j)] - srcp[+srcs  -(j)])+\
   FFABS(srcp[-srcs+1+(j)] - srcp[+srcs+1-(j)])

#define CHECK_EDGE

(

j

)

Value:

{   int score = GET_SCORE_EDGE(j);\
        if (score < spatial_score){\
            spatial_score = score;\
            diff0 = filp[-fils+DELTA(j)]    - srcp[-srcs+DELTA(j)];\
            diff1 = filp[+fils+DELTA(-(j))] - srcp[+srcs+DELTA(-(j))];\

Referenced by filter_frame().

#define CHECK

(

j

)

Value:

{   int score = GET_SCORE(j);\
        if (score < spatial_score){\
            spatial_score= score;\
            diff0 = filp[-fils+(j)] - srcp[-srcs+(j)];\
            diff1 = filp[+fils-(j)] - srcp[+srcs-(j)];\

Enumeration Type Documentation

enum MCDeintMode

Enumerator
MODE_FAST
MODE_MEDIUM
MODE_SLOW
MODE_EXTRA_SLOW
MODE_NB

Definition at line 57 of file vf_mcdeint.c.

enum MCDeintParity

Enumerator
PARITY_TFF	top field first
PARITY_BFF	bottom field first

Definition at line 65 of file vf_mcdeint.c.

Function Documentation

AVFILTER_DEFINE_CLASS

(

mcdeint

)

static int config_props ( AVFilterLink *  inlink )

static

Definition at line 99 of file vf_mcdeint.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 151 of file vf_mcdeint.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 161 of file vf_mcdeint.c.

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

static

Definition at line 172 of file vf_mcdeint.c.

CHECK

(

-

1

)

for

(

)

Definition at line 266 of file vf_mcdeint.c.

if

(

)

Definition at line 280 of file vf_mcdeint.c.

return ff_filter_frame	(	outlink	,
		outpic
	)

Variable Documentation

const AVOption mcdeint_options[]

static

Initial value:

= {
    { "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_FAST}, 0, MODE_NB-1, FLAGS, .unit="mode" },
    CONST("fast",       NULL, MODE_FAST,       "mode"),
    CONST("medium",     NULL, MODE_MEDIUM,     "mode"),
    CONST("slow",       NULL, MODE_SLOW,       "mode"),
    CONST("extra_slow", NULL, MODE_EXTRA_SLOW, "mode"),

    { "parity", "set the assumed picture field parity", OFFSET(parity), AV_OPT_TYPE_INT, {.i64=PARITY_BFF}, -1, 1, FLAGS, "parity" },
    CONST("tff", "assume top field first",    PARITY_TFF, "parity"),
    CONST("bff", "assume bottom field first", PARITY_BFF, "parity"),

    { "qp", "set qp", OFFSET(qp), AV_OPT_TYPE_INT, {.i64=1}, INT_MIN, INT_MAX, FLAGS },
    { NULL }
}

Definition at line 82 of file vf_mcdeint.c.

else int spatial_score = GET_SCORE(0) - 1

Definition at line 248 of file vf_mcdeint.c.

Referenced by filter_frame().

else temp = (diff0 + diff1 + FFABS(FFABS(diff0) - FFABS(diff1)) / 2) / 2

Definition at line 257 of file vf_mcdeint.c.

Referenced by a64_compress_colram(), at1_subband_synthesis(), av_opencl_buffer_read_image(), av_opencl_buffer_write_image(), backward_filter(), bink_idct_c(), bink_idct_put_c(), bit8x8_c(), celt_decode_allocation(), comp_interp_index(), config_input(), dct_max8x8_c(), dct_sad8x8_c(), decode_8_pulses_31bits(), decode_plane(), decode_rgb_frame(), encode_mode(), ff_atrac_iqmf(), ff_block_permute(), ff_ea_idct_put_c(), ff_faandct(), ff_faandct248(), ff_faanidct(), ff_faanidct_add(), ff_faanidct_put(), ff_h264_chroma422_dc_dequant_idct(), ff_h264_luma_dc_dequant_idct(), ff_put_wav_header(), ff_svq3_luma_dc_dequant_idct_c(), ff_vorbis_inverse_coupling(), filter(), filter_frame(), find_new_headers(), flac_parse(), flac_parse_close(), formant_postfilter(), gain_scale(), gen_fcb_excitation(), get_tilt_comp(), h261_loop_filter(), hadamard8_diff8x8_c(), hadamard8_intra8x8_c(), handle_file(), hnm_flip_buffers(), http_write(), hybrid6_cx(), idct(), idct_put(), idctRowCondDC(), imdct_and_windowing(), imdct_and_windowing_eld(), inverse_quant(), ls_encode_runterm(), ls_get_code_runterm(), main(), matroska_parse_laces(), on2avc_reconstruct_channel(), postfilter(), pp_get_mode_by_name_and_quality(), quant_psnr8x8_c(), rd8x8_c(), read16(), read32(), read_time(), render_slice(), rtmp_server_handshake(), rv34_idct_add_c(), rv34_inv_transform_noround_c(), sbr_gain_calc(), sbr_make_f_derived(), sbr_make_f_master(), scale_coefs(), setup_classifs(), store_slice16_c(), store_slice2_c(), store_slice_c(), sub_left_prediction(), svq1_encode_plane(), tta_encode_frame(), unpack_bitstream(), vc1_inv_trans_8x8_c(), and wavpack_encode_block().

* filp = *dstp = temp > 255U ? ~(temp>>31) : temp

Definition at line 258 of file vf_mcdeint.c.

Referenced by filter_frame().

else

Initial value:

{
                        *dstp = *filp

Definition at line 259 of file vf_mcdeint.c.

mcdeint parity = 1

Definition at line 275 of file vf_mcdeint.c.

Referenced by filter(), pic_as_field(), pullup_submit_field(), read_access_unit(), and split_field_copy().

end __pad0__

Definition at line 278 of file vf_mcdeint.c.

av_frame_free& inpic

Definition at line 279 of file vf_mcdeint.c.

Referenced by filter_frame(), and for().

const AVFilterPad mcdeint_inputs[]

static

Initial value:

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

Definition at line 287 of file vf_mcdeint.c.

const AVFilterPad mcdeint_outputs[]

static

Initial value:

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

Definition at line 297 of file vf_mcdeint.c.

AVFilter ff_vf_mcdeint

Initial value:

= {
    .name          = "mcdeint",
    .description   = NULL_IF_CONFIG_SMALL("Apply motion compensating deinterlacing."),
    .priv_size     = sizeof(MCDeintContext),
    .uninit        = uninit,
    .query_formats = query_formats,
    .inputs        = mcdeint_inputs,
    .outputs       = mcdeint_outputs,
    .priv_class    = &mcdeint_class,
}

Definition at line 305 of file vf_mcdeint.c.