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/*
* 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 <float.h> /* FLT_MAX */
#include "libavutil/cpu.h"
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "internal.h"
#include "vf_idet.h"
#define OFFSET(x) offsetof(IDETContext, x)
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption idet_options[] = {
{ "intl_thres", "set interlacing threshold", OFFSET(interlace_threshold), AV_OPT_TYPE_FLOAT, {.dbl = 1.04}, -1, FLT_MAX, FLAGS },
{ "prog_thres", "set progressive threshold", OFFSET(progressive_threshold), AV_OPT_TYPE_FLOAT, {.dbl = 1.5}, -1, FLT_MAX, FLAGS },
{ "rep_thres", "set repeat threshold", OFFSET(repeat_threshold), AV_OPT_TYPE_FLOAT, {.dbl = 3.0}, -1, FLT_MAX, FLAGS },
{ "half_life", "half life of cumulative statistics", OFFSET(half_life), AV_OPT_TYPE_FLOAT, {.dbl = 0.0}, -1, INT_MAX, FLAGS },
{ "analyze_interlaced_flag", "set number of frames to use to determine if the interlace flag is accurate", OFFSET(analyze_interlaced_flag), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT_MAX, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(idet);
static const char *type2str(Type type)
{
switch(type) {
case TFF : return "tff";
case BFF : return "bff";
case PROGRESSIVE : return "progressive";
case UNDETERMINED : return "undetermined";
}
return NULL;
}
#define PRECISION 1048576
static uint64_t uintpow(uint64_t b,unsigned int e)
{
uint64_t r=1;
while(e--) r*=b;
return r;
}
static int av_dict_set_fxp(AVDictionary **pm, const char *key, uint64_t value, unsigned int digits,
int flags)
{
char valuestr[44];
uint64_t print_precision = uintpow(10, digits);
value = av_rescale(value, print_precision, PRECISION);
snprintf(valuestr, sizeof(valuestr), "%"PRId64".%0*"PRId64,
value / print_precision, digits, value % print_precision);
return av_dict_set(pm, key, valuestr, flags);
}
static const char *rep2str(RepeatedField repeated_field)
{
switch(repeated_field) {
case REPEAT_NONE : return "neither";
case REPEAT_TOP : return "top";
case REPEAT_BOTTOM : return "bottom";
}
return NULL;
}
int ff_idet_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++){
int v = (*a++ + *c++) - 2 * *b++;
ret += FFABS(v);
}
return ret;
}
int ff_idet_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++){
int v = (*a++ + *c++) - 2 * *b++;
ret += FFABS(v);
}
return ret;
}
static void filter(AVFilterContext *ctx)
{
IDETContext *idet = ctx->priv;
int y, i;
int64_t alpha[2]={0};
int64_t delta=0;
int64_t gamma[2]={0};
Type type, best_type;
RepeatedField repeat;
int match = 0;
AVDictionary **metadata = avpriv_frame_get_metadatap(idet->cur);
for (i = 0; i < idet->csp->nb_components; i++) {
int w = idet->cur->width;
int h = idet->cur->height;
int refs = idet->cur->linesize[i];
if (i && i<3) {
w = FF_CEIL_RSHIFT(w, idet->csp->log2_chroma_w);
h = FF_CEIL_RSHIFT(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);
gamma[(y^1)&1] += idet->filter_line(cur , prev, cur , w);
}
}
if (alpha[0] > idet->interlace_threshold * alpha[1]){
type = TFF;
}else if(alpha[1] > idet->interlace_threshold * alpha[0]){
type = BFF;
}else if(alpha[1] > idet->progressive_threshold * delta){
type = PROGRESSIVE;
}else{
type = UNDETERMINED;
}
if ( gamma[0] > idet->repeat_threshold * gamma[1] ){
repeat = REPEAT_TOP;
} else if ( gamma[1] > idet->repeat_threshold * gamma[0] ){
repeat = REPEAT_BOTTOM;
} else {
repeat = REPEAT_NONE;
}
memmove(idet->history+1, idet->history, HIST_SIZE-1);
idet->history[0] = type;
best_type = UNDETERMINED;
for(i=0; i<HIST_SIZE; i++){
if(idet->history[i] != UNDETERMINED){
if(best_type == UNDETERMINED)
best_type = idet->history[i];
if(idet->history[i] == best_type) {
match++;
}else{
match=0;
break;
}
}
}
if(idet->last_type == UNDETERMINED){
if(match ) idet->last_type = best_type;
}else{
if(match>2) idet->last_type = best_type;
}
if (idet->last_type == TFF){
idet->cur->top_field_first = 1;
idet->cur->interlaced_frame = 1;
}else if(idet->last_type == BFF){
idet->cur->top_field_first = 0;
idet->cur->interlaced_frame = 1;
}else if(idet->last_type == PROGRESSIVE){
idet->cur->interlaced_frame = 0;
}
for(i=0; i<3; i++)
idet->repeats[i] = av_rescale(idet->repeats [i], idet->decay_coefficient, PRECISION);
for(i=0; i<4; i++){
idet->prestat [i] = av_rescale(idet->prestat [i], idet->decay_coefficient, PRECISION);
idet->poststat[i] = av_rescale(idet->poststat[i], idet->decay_coefficient, PRECISION);
}
idet->total_repeats [ repeat] ++;
idet->repeats [ repeat] += PRECISION;
idet->total_prestat [ type] ++;
idet->prestat [ type] += PRECISION;
idet->total_poststat[idet->last_type] ++;
idet->poststat [idet->last_type] += PRECISION;
av_log(ctx, AV_LOG_DEBUG, "Repeated Field:%12s, Single frame:%12s, Multi frame:%12s\n",
rep2str(repeat), type2str(type), type2str(idet->last_type));
av_dict_set (metadata, "lavfi.idet.repeated.current_frame", rep2str(repeat), 0);
av_dict_set_fxp(metadata, "lavfi.idet.repeated.neither", idet->repeats[REPEAT_NONE], 2, 0);
av_dict_set_fxp(metadata, "lavfi.idet.repeated.top", idet->repeats[REPEAT_TOP], 2, 0);
av_dict_set_fxp(metadata, "lavfi.idet.repeated.bottom", idet->repeats[REPEAT_BOTTOM], 2, 0);
av_dict_set (metadata, "lavfi.idet.single.current_frame", type2str(type), 0);
av_dict_set_fxp(metadata, "lavfi.idet.single.tff", idet->prestat[TFF], 2 , 0);
av_dict_set_fxp(metadata, "lavfi.idet.single.bff", idet->prestat[BFF], 2, 0);
av_dict_set_fxp(metadata, "lavfi.idet.single.progressive", idet->prestat[PROGRESSIVE], 2, 0);
av_dict_set_fxp(metadata, "lavfi.idet.single.undetermined", idet->prestat[UNDETERMINED], 2, 0);
av_dict_set (metadata, "lavfi.idet.multiple.current_frame", type2str(idet->last_type), 0);
av_dict_set_fxp(metadata, "lavfi.idet.multiple.tff", idet->poststat[TFF], 2, 0);
av_dict_set_fxp(metadata, "lavfi.idet.multiple.bff", idet->poststat[BFF], 2, 0);
av_dict_set_fxp(metadata, "lavfi.idet.multiple.progressive", idet->poststat[PROGRESSIVE], 2, 0);
av_dict_set_fxp(metadata, "lavfi.idet.multiple.undetermined", idet->poststat[UNDETERMINED], 2, 0);
}
static int filter_frame(AVFilterLink *link, AVFrame *picref)
{
AVFilterContext *ctx = link->dst;
IDETContext *idet = ctx->priv;
// initial frame(s) and not interlaced, just pass through for
// the analyze_interlaced_flag mode
if (idet->analyze_interlaced_flag &&
!picref->interlaced_frame &&
!idet->next) {
return ff_filter_frame(ctx->outputs[0], picref);
}
if (idet->analyze_interlaced_flag_done) {
if (picref->interlaced_frame && idet->interlaced_flag_accuracy < 0)
picref->interlaced_frame = 0;
return ff_filter_frame(ctx->outputs[0], picref);
}
av_frame_free(&idet->prev);
if( picref->width != link->w
|| picref->height != link->h
|| picref->format != link->format) {
link->dst->inputs[0]->format = picref->format;
link->dst->inputs[0]->w = picref->width;
link->dst->inputs[0]->h = picref->height;
av_frame_free(&idet->cur );
av_frame_free(&idet->next);
}
idet->prev = idet->cur;
idet->cur = idet->next;
idet->next = picref;
if (!idet->cur &&
!(idet->cur = av_frame_clone(idet->next)))
return AVERROR(ENOMEM);
if (!idet->prev)
return 0;
if (!idet->csp)
idet->csp = av_pix_fmt_desc_get(link->format);
if (idet->csp->comp[0].depth_minus1 / 8 == 1){
idet->filter_line = (ff_idet_filter_func)ff_idet_filter_line_c_16bit;
if (ARCH_X86)
ff_idet_init_x86(idet, 1);
}
if (idet->analyze_interlaced_flag) {
if (idet->cur->interlaced_frame) {
idet->cur->interlaced_frame = 0;
filter(ctx);
if (idet->last_type == PROGRESSIVE) {
idet->interlaced_flag_accuracy --;
idet->analyze_interlaced_flag --;
} else if (idet->last_type != UNDETERMINED) {
idet->interlaced_flag_accuracy ++;
idet->analyze_interlaced_flag --;
}
if (idet->analyze_interlaced_flag == 1) {
ff_filter_frame(ctx->outputs[0], av_frame_clone(idet->cur));
if (idet->next->interlaced_frame && idet->interlaced_flag_accuracy < 0)
idet->next->interlaced_frame = 0;
idet->analyze_interlaced_flag_done = 1;
av_log(ctx, AV_LOG_INFO, "Final flag accuracy %d\n", idet->interlaced_flag_accuracy);
return ff_filter_frame(ctx->outputs[0], av_frame_clone(idet->next));
}
}
} else {
filter(ctx);
}
return ff_filter_frame(ctx->outputs[0], av_frame_clone(idet->cur));
}
static int request_frame(AVFilterLink *link)
{
AVFilterContext *ctx = link->src;
IDETContext *idet = ctx->priv;
do {
int ret;
if (idet->eof)
return AVERROR_EOF;
ret = ff_request_frame(link->src->inputs[0]);
if (ret == AVERROR_EOF && idet->cur && !idet->analyze_interlaced_flag_done) {
AVFrame *next = av_frame_clone(idet->next);
if (!next)
return AVERROR(ENOMEM);
filter_frame(link->src->inputs[0], next);
idet->eof = 1;
} else if (ret < 0) {
return ret;
}
} while (link->frame_requested);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
IDETContext *idet = ctx->priv;
int level = strncmp(ctx->name, "auto-inserted", 13) ? AV_LOG_INFO : AV_LOG_DEBUG;
av_log(ctx, level, "Repeated Fields: Neither:%6"PRId64" Top:%6"PRId64" Bottom:%6"PRId64"\n",
idet->total_repeats[REPEAT_NONE],
idet->total_repeats[REPEAT_TOP],
idet->total_repeats[REPEAT_BOTTOM]
);
av_log(ctx, level, "Single frame detection: TFF:%6"PRId64" BFF:%6"PRId64" Progressive:%6"PRId64" Undetermined:%6"PRId64"\n",
idet->total_prestat[TFF],
idet->total_prestat[BFF],
idet->total_prestat[PROGRESSIVE],
idet->total_prestat[UNDETERMINED]
);
av_log(ctx, level, "Multi frame detection: TFF:%6"PRId64" BFF:%6"PRId64" Progressive:%6"PRId64" Undetermined:%6"PRId64"\n",
idet->total_poststat[TFF],
idet->total_poststat[BFF],
idet->total_poststat[PROGRESSIVE],
idet->total_poststat[UNDETERMINED]
);
av_frame_free(&idet->prev);
av_frame_free(&idet->cur );
av_frame_free(&idet->next);
}
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV444P,
AV_PIX_FMT_YUV410P,
AV_PIX_FMT_YUV411P,
AV_PIX_FMT_GRAY8,
AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUVJ422P,
AV_PIX_FMT_YUVJ444P,
AV_PIX_FMT_GRAY16,
AV_PIX_FMT_YUV440P,
AV_PIX_FMT_YUVJ440P,
AV_PIX_FMT_YUV420P9,
AV_PIX_FMT_YUV422P9,
AV_PIX_FMT_YUV444P9,
AV_PIX_FMT_YUV420P10,
AV_PIX_FMT_YUV422P10,
AV_PIX_FMT_YUV444P10,
AV_PIX_FMT_YUV420P12,
AV_PIX_FMT_YUV422P12,
AV_PIX_FMT_YUV444P12,
AV_PIX_FMT_YUV420P14,
AV_PIX_FMT_YUV422P14,
AV_PIX_FMT_YUV444P14,
AV_PIX_FMT_YUV420P16,
AV_PIX_FMT_YUV422P16,
AV_PIX_FMT_YUV444P16,
AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_NONE
};
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
static int config_output(AVFilterLink *outlink)
{
outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
return 0;
}
static av_cold int init(AVFilterContext *ctx)
{
IDETContext *idet = ctx->priv;
idet->eof = 0;
idet->last_type = UNDETERMINED;
memset(idet->history, UNDETERMINED, HIST_SIZE);
if( idet->half_life > 0 )
idet->decay_coefficient = (uint64_t) round( PRECISION * exp2(-1.0 / idet->half_life) );
else
idet->decay_coefficient = PRECISION;
idet->filter_line = ff_idet_filter_line_c;
if (ARCH_X86)
ff_idet_init_x86(idet, 0);
return 0;
}
static const AVFilterPad idet_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
{ NULL }
};
static const AVFilterPad idet_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_output,
.request_frame = request_frame
},
{ NULL }
};
AVFilter ff_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 = idet_inputs,
.outputs = idet_outputs,
.priv_class = &idet_class,
};
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