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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_freeinpic
 
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.

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

Enumerator:
MODE_FAST 
MODE_MEDIUM 
MODE_SLOW 
MODE_EXTRA_SLOW 
MODE_NB 

Definition at line 57 of file vf_mcdeint.c.

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 150 of file vf_mcdeint.c.

static int query_formats ( AVFilterContext ctx)
static

Definition at line 160 of file vf_mcdeint.c.

static int filter_frame ( AVFilterLink inlink,
AVFrame inpic 
)
static

Definition at line 171 of file vf_mcdeint.c.

CHECK ( 1)
for ( )

Definition at line 267 of file vf_mcdeint.c.

if ( )

Definition at line 281 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 249 of file vf_mcdeint.c.

Referenced by filter_frame().

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

Definition at line 258 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_mp_image_alloc_planes(), 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(), 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 259 of file vf_mcdeint.c.

Referenced by filter_frame().

else
Initial value:
{
*dstp = *filp

Definition at line 260 of file vf_mcdeint.c.

mcdeint parity = 1
end __pad0__

Definition at line 279 of file vf_mcdeint.c.

av_frame_free& inpic

Definition at line 280 of file vf_mcdeint.c.

Referenced by filter_frame(), and for().

const AVFilterPad mcdeint_inputs[]
static
Initial value:
= {
{
.name = "default",
.filter_frame = filter_frame,
.config_props = config_props,
},
{ NULL }
}

Definition at line 288 of file vf_mcdeint.c.

const AVFilterPad mcdeint_outputs[]
static
Initial value:
= {
{
.name = "default",
},
{ NULL }
}

Definition at line 298 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),
.priv_class = &mcdeint_class,
}

Definition at line 306 of file vf_mcdeint.c.