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libavfilter: Add interlace detect filter. 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-04-03 15:56:04 +02:00
parent 12292f35a3
commit e3e89b6d8b
4 changed files with 277 additions and 0 deletions
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5
doc/filters.texi
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@ -1695,6 +1695,11 @@ a float number which specifies chroma temporal strength, defaults to
@var{luma_tmp}*@var{chroma_spatial}/@var{luma_spatial}
@end table
@section idet
Interlaceing detect filter. This filter tries to detect if the input is
interlaced or progressive. Top or bottom field first.
@section lut, lutrgb, lutyuv
Compute a look-up table for binding each pixel component input value

1
libavfilter/Makefile
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@ -67,6 +67,7 @@ OBJS-$(CONFIG_FREI0R_FILTER) += vf_frei0r.o
OBJS-$(CONFIG_GRADFUN_FILTER) += vf_gradfun.o
OBJS-$(CONFIG_HFLIP_FILTER) += vf_hflip.o
OBJS-$(CONFIG_HQDN3D_FILTER) += vf_hqdn3d.o
OBJS-$(CONFIG_IDET_FILTER) += vf_idet.o
OBJS-$(CONFIG_LUT_FILTER) += vf_lut.o
OBJS-$(CONFIG_LUTRGB_FILTER) += vf_lut.o
OBJS-$(CONFIG_LUTYUV_FILTER) += vf_lut.o

1
libavfilter/allfilters.c
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@ -75,6 +75,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (GRADFUN, gradfun, vf);
REGISTER_FILTER (HFLIP, hflip, vf);
REGISTER_FILTER (HQDN3D, hqdn3d, vf);
REGISTER_FILTER (IDET, idet, vf);
REGISTER_FILTER (LUT, lut, vf);
REGISTER_FILTER (LUTRGB, lutrgb, vf);
REGISTER_FILTER (LUTYUV, lutyuv, vf);

270
libavfilter/vf_idet.c Normal file
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@ -0,0 +1,270 @@
/*
* Copyright (C) 2012 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/cpu.h"
#include "libavutil/common.h"
#include "libavutil/pixdesc.h"
#include "avfilter.h"
#undef NDEBUG
#include <assert.h>
typedef struct {
float interlace_threshold;
float progressive_threshold;
AVFilterBufferRef *cur;
AVFilterBufferRef *next;
AVFilterBufferRef *prev;
AVFilterBufferRef *out;
int (*filter_line)(uint8_t *prev, uint8_t *cur, uint8_t *next, int w);
const AVPixFmtDescriptor *csp;
} IDETContext;
static int filter_line_c(const uint8_t *a, const uint8_t *b, const uint8_t *c, int w)
{
int x;
int ret=0;
for(x=0; x<w; x++){
ret += FFABS((*a++ + *c++) - 2 * *b++);
}
return ret;
}
static int filter_line_c_16bit(const uint16_t *a, const uint16_t *b, const uint16_t *c, int w)
{
int x;
int ret=0;
for(x=0; x<w; x++){
ret += FFABS((*a++ + *c++) - 2 * *b++);
}
return ret;
}
static void filter(AVFilterContext *ctx)
{
IDETContext *idet = ctx->priv;
int y, i;
int64_t alpha[2]={0};
int64_t delta=0;
static int p=0, t=0, b=0, u=0;
for (i = 0; i < idet->csp->nb_components; i++) {
int w = idet->cur->video->w;
int h = idet->cur->video->h;
int refs = idet->cur->linesize[i];
int df = (idet->csp->comp[i].depth_minus1 + 8) / 8;
if (i && i<3) {
w >>= idet->csp->log2_chroma_w;
h >>= idet->csp->log2_chroma_h;
}
for (y = 2; y < h - 2; y++) {
uint8_t *prev = &idet->prev->data[i][y*refs];
uint8_t *cur = &idet->cur ->data[i][y*refs];
uint8_t *next = &idet->next->data[i][y*refs];
alpha[ y &1] += idet->filter_line(cur-refs, prev, cur+refs, w);
alpha[(y^1)&1] += idet->filter_line(cur-refs, next, cur+refs, w);
delta += idet->filter_line(cur-refs, cur, cur+refs, w);
}
}
#if HAVE_MMX
__asm__ volatile("emms \n\t" : : : "memory");
#endif
if (alpha[0] / (float)alpha[1] > idet->interlace_threshold){
av_log(0, AV_LOG_INFO, "Interlaced, top field first\n");
t++;
}else if(alpha[1] / (float)alpha[0] > idet->interlace_threshold){
av_log(0, AV_LOG_INFO, "Interlaced, bottom field first\n");
b++;
}else if(alpha[1] / (float)delta > idet->progressive_threshold){
av_log(0, AV_LOG_INFO, "Progressive\n");
p++;
}else{
av_log(0, AV_LOG_INFO, "Undetermined\n");
u++;
}
// av_log(0,0, "t%d b%d p%d u%d\n", t,b,p,u);
}
static void return_frame(AVFilterContext *ctx)
{
}
static void start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
{
AVFilterContext *ctx = link->dst;
IDETContext *idet = ctx->priv;
if (idet->prev)
avfilter_unref_buffer(idet->prev);
idet->prev = idet->cur;
idet->cur = idet->next;
idet->next = picref;
if (!idet->cur)
return;
if (!idet->prev)
idet->prev = avfilter_ref_buffer(idet->cur, AV_PERM_READ);
avfilter_start_frame(ctx->outputs[0], avfilter_ref_buffer(idet->cur, AV_PERM_READ));
}
static void end_frame(AVFilterLink *link)
{
AVFilterContext *ctx = link->dst;
IDETContext *idet = ctx->priv;
if (!idet->cur)
return;
if (!idet->csp)
idet->csp = &av_pix_fmt_descriptors[link->format];
if (idet->csp->comp[0].depth_minus1 / 8 == 1)
idet->filter_line = (void*)filter_line_c_16bit;
filter(ctx);
avfilter_draw_slice(ctx->outputs[0], 0, link->h, 1);
avfilter_end_frame(ctx->outputs[0]);
}
static int request_frame(AVFilterLink *link)
{
AVFilterContext *ctx = link->src;
IDETContext *idet = ctx->priv;
do {
int ret;
if ((ret = avfilter_request_frame(link->src->inputs[0])))
return ret;
} while (!idet->cur);
return 0;
}
static int poll_frame(AVFilterLink *link)
{
IDETContext *idet = link->src->priv;
int ret, val;
val = avfilter_poll_frame(link->src->inputs[0]);
if (val >= 1 && !idet->next) { //FIXME change API to not requre this red tape
if ((ret = avfilter_request_frame(link->src->inputs[0])) < 0)
return ret;
val = avfilter_poll_frame(link->src->inputs[0]);
}
assert(idet->next || !val);
return val;
}
static av_cold void uninit(AVFilterContext *ctx)
{
IDETContext *idet = ctx->priv;
if (idet->prev) avfilter_unref_buffer(idet->prev);
if (idet->cur ) avfilter_unref_buffer(idet->cur );
if (idet->next) avfilter_unref_buffer(idet->next);
}
static int query_formats(AVFilterContext *ctx)
{
static const enum PixelFormat pix_fmts[] = {
PIX_FMT_YUV420P,
PIX_FMT_YUV422P,
PIX_FMT_YUV444P,
PIX_FMT_YUV410P,
PIX_FMT_YUV411P,
PIX_FMT_GRAY8,
PIX_FMT_YUVJ420P,
PIX_FMT_YUVJ422P,
PIX_FMT_YUVJ444P,
AV_NE( PIX_FMT_GRAY16BE, PIX_FMT_GRAY16LE ),
PIX_FMT_YUV440P,
PIX_FMT_YUVJ440P,
AV_NE( PIX_FMT_YUV420P10BE, PIX_FMT_YUV420P10LE ),
AV_NE( PIX_FMT_YUV422P10BE, PIX_FMT_YUV422P10LE ),
AV_NE( PIX_FMT_YUV444P10BE, PIX_FMT_YUV444P10LE ),
AV_NE( PIX_FMT_YUV420P16BE, PIX_FMT_YUV420P16LE ),
AV_NE( PIX_FMT_YUV422P16BE, PIX_FMT_YUV422P16LE ),
AV_NE( PIX_FMT_YUV444P16BE, PIX_FMT_YUV444P16LE ),
PIX_FMT_YUVA420P,
PIX_FMT_NONE
};
avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
return 0;
}
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
{
IDETContext *idet = ctx->priv;
int cpu_flags = av_get_cpu_flags();
idet->csp = NULL;
idet->interlace_threshold = 1.01;
idet->progressive_threshold = 2.5;
if (args) sscanf(args, "%f:%f", &idet->interlace_threshold, &idet->progressive_threshold);
idet->filter_line = filter_line_c;
return 0;
}
static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { }
AVFilter avfilter_vf_idet = {
.name = "idet",
.description = NULL_IF_CONFIG_SMALL("Interlace detect Filter."),
.priv_size = sizeof(IDETContext),
.init = init,
.uninit = uninit,
.query_formats = query_formats,
.inputs = (const AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.start_frame = start_frame,
.draw_slice = null_draw_slice,
.end_frame = end_frame,
.rej_perms = AV_PERM_REUSE2, },
{ .name = NULL}},
.outputs = (const AVFilterPad[]) {{ .name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.poll_frame = poll_frame,
.request_frame = request_frame, },
{ .name = NULL}},
};