1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
|
/*
* 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 "libavutil/pixdesc.h"
#include "avfilter.h"
#include "internal.h"
#undef NDEBUG
#include <assert.h>
#define HIST_SIZE 4
typedef enum {
TFF,
BFF,
PROGRSSIVE,
UNDETERMINED,
} Type;
typedef struct {
const AVClass *class;
float interlace_threshold;
float progressive_threshold;
Type last_type;
Type prestat[4];
Type poststat[4];
uint8_t history[HIST_SIZE];
AVFilterBufferRef *cur;
AVFilterBufferRef *next;
AVFilterBufferRef *prev;
int (*filter_line)(const uint8_t *prev, const uint8_t *cur, const uint8_t *next, int w);
const AVPixFmtDescriptor *csp;
} IDETContext;
#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 = 1.01}, -1, FLT_MAX, FLAGS },
{ "prog_thres", "set progressive threshold", OFFSET(progressive_threshold), AV_OPT_TYPE_FLOAT, {.dbl = 2.5}, -1, FLT_MAX, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(idet);
static const char *type2str(Type type)
{
switch(type) {
case TFF : return "Top Field First ";
case BFF : return "Bottom Field First";
case PROGRSSIVE : return "Progressive ";
case UNDETERMINED: return "Undetermined ";
}
return NULL;
}
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;
Type type, best_type;
int match = 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];
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 (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 = PROGRSSIVE;
}else{
type = UNDETERMINED;
}
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->video->top_field_first = 1;
idet->cur->video->interlaced = 1;
}else if(idet->last_type == BFF){
idet->cur->video->top_field_first = 0;
idet->cur->video->interlaced = 1;
}else if(idet->last_type == PROGRSSIVE){
idet->cur->video->interlaced = 0;
}
idet->prestat [ type] ++;
idet->poststat[idet->last_type] ++;
av_log(ctx, AV_LOG_DEBUG, "Single frame:%s, Multi frame:%s\n", type2str(type), type2str(idet->last_type));
}
static int filter_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 0;
if (!idet->prev)
idet->prev = avfilter_ref_buffer(idet->cur, ~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 = (void*)filter_line_c_16bit;
filter(ctx);
return ff_filter_frame(ctx->outputs[0], avfilter_ref_buffer(idet->cur, ~0));
}
static int request_frame(AVFilterLink *link)
{
AVFilterContext *ctx = link->src;
IDETContext *idet = ctx->priv;
do {
int ret;
if ((ret = ff_request_frame(link->src->inputs[0])))
return ret;
} while (!idet->cur);
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
IDETContext *idet = ctx->priv;
av_log(ctx, AV_LOG_INFO, "Single frame detection: TFF:%d BFF:%d Progressive:%d Undetermined:%d\n",
idet->prestat[TFF],
idet->prestat[BFF],
idet->prestat[PROGRSSIVE],
idet->prestat[UNDETERMINED]
);
av_log(ctx, AV_LOG_INFO, "Multi frame detection: TFF:%d BFF:%d Progressive:%d Undetermined:%d\n",
idet->poststat[TFF],
idet->poststat[BFF],
idet->poststat[PROGRSSIVE],
idet->poststat[UNDETERMINED]
);
avfilter_unref_bufferp(&idet->prev);
avfilter_unref_bufferp(&idet->cur );
avfilter_unref_bufferp(&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_NE( AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY16LE ),
AV_PIX_FMT_YUV440P,
AV_PIX_FMT_YUVJ440P,
AV_NE( AV_PIX_FMT_YUV420P10BE, AV_PIX_FMT_YUV420P10LE ),
AV_NE( AV_PIX_FMT_YUV422P10BE, AV_PIX_FMT_YUV422P10LE ),
AV_NE( AV_PIX_FMT_YUV444P10BE, AV_PIX_FMT_YUV444P10LE ),
AV_NE( AV_PIX_FMT_YUV420P16BE, AV_PIX_FMT_YUV420P16LE ),
AV_NE( AV_PIX_FMT_YUV422P16BE, AV_PIX_FMT_YUV422P16LE ),
AV_NE( AV_PIX_FMT_YUV444P16BE, AV_PIX_FMT_YUV444P16LE ),
AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_NONE
};
ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
return 0;
}
static av_cold int init(AVFilterContext *ctx, const char *args)
{
IDETContext *idet = ctx->priv;
static const char *shorthand[] = { "intl_thres", "prog_thres", NULL };
int ret;
idet->class = &idet_class;
av_opt_set_defaults(idet);
if ((ret = av_opt_set_from_string(idet, args, shorthand, "=", ":")) < 0)
return ret;
idet->last_type = UNDETERMINED;
memset(idet->history, UNDETERMINED, HIST_SIZE);
idet->filter_line = filter_line_c;
return 0;
}
static const AVFilterPad idet_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
.min_perms = AV_PERM_PRESERVE,
},
{ NULL }
};
static const AVFilterPad idet_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.rej_perms = AV_PERM_WRITE,
.request_frame = request_frame,
},
{ NULL }
};
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 = idet_inputs,
.outputs = idet_outputs,
.priv_class = &idet_class,
};
|