h264_metadata: Add option to delete filler data
[libav.git] / libavfilter / vf_cropdetect.c
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68b79bfc 1/*
3fa77bde 2 * Copyright (c) 2002 A'rpi
2912e87a 3 * This file is part of Libav.
68b79bfc 4 *
2912e87a 5 * Libav is free software; you can redistribute it and/or modify
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6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
2912e87a 10 * Libav is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
2912e87a 16 * with Libav; if not, write to the Free Software Foundation, Inc.,
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17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20/**
21 * @file
22 * border detection filter
23 * Ported from MPlayer libmpcodecs/vf_cropdetect.c.
24 */
25
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26#include <stdio.h>
27
737eb597 28#include "libavutil/imgutils.h"
1d9c2dc8 29#include "libavutil/internal.h"
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30#include "libavutil/opt.h"
31
68b79bfc 32#include "avfilter.h"
b74a1da4 33#include "formats.h"
9d0bfc50 34#include "internal.h"
c04c533f 35#include "video.h"
68b79bfc 36
58400ac1 37typedef struct CropDetectContext {
460e7b4f 38 const AVClass *class;
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39 int x1, y1, x2, y2;
40 int limit;
41 int round;
42 int reset_count;
43 int frame_nb;
44 int max_pixsteps[4];
45} CropDetectContext;
46
47static int query_formats(AVFilterContext *ctx)
48{
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49 static const enum AVPixelFormat pix_fmts[] = {
50 AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P,
51 AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P,
52 AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P,
53 AV_PIX_FMT_YUV411P, AV_PIX_FMT_GRAY8,
54 AV_PIX_FMT_NV12, AV_PIX_FMT_NV21,
55 AV_PIX_FMT_NONE
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56 };
57
b74a1da4 58 ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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59 return 0;
60}
61
62static int checkline(void *ctx, const unsigned char *src, int stride, int len, int bpp)
63{
64 int total = 0;
65 int div = len;
66
67 switch (bpp) {
68 case 1:
69 while (--len >= 0) {
70 total += src[0];
71 src += stride;
72 }
73 break;
74 case 3:
75 case 4:
76 while (--len >= 0) {
77 total += src[0] + src[1] + src[2];
78 src += stride;
79 }
80 div *= 3;
81 break;
82 }
83 total /= div;
84
85 av_log(ctx, AV_LOG_DEBUG, "total:%d\n", total);
86 return total;
87}
88
c43a7eca 89static av_cold int init(AVFilterContext *ctx)
68b79bfc 90{
e16e23d7 91 CropDetectContext *s = ctx->priv;
68b79bfc 92
e16e23d7 93 s->frame_nb = -2;
68b79bfc 94
1a49a169 95 av_log(ctx, AV_LOG_VERBOSE, "limit:%d round:%d reset_count:%d\n",
e16e23d7 96 s->limit, s->round, s->reset_count);
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97
98 return 0;
99}
100
101static int config_input(AVFilterLink *inlink)
102{
103 AVFilterContext *ctx = inlink->dst;
e16e23d7 104 CropDetectContext *s = ctx->priv;
68b79bfc 105
e16e23d7 106 av_image_fill_max_pixsteps(s->max_pixsteps, NULL,
59ee9f78 107 av_pix_fmt_desc_get(inlink->format));
68b79bfc 108
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109 s->x1 = inlink->w - 1;
110 s->y1 = inlink->h - 1;
111 s->x2 = 0;
112 s->y2 = 0;
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113
114 return 0;
115}
116
7e350379 117static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
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118{
119 AVFilterContext *ctx = inlink->dst;
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120 CropDetectContext *s = ctx->priv;
121 int bpp = s->max_pixsteps[0];
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122 int w, h, x, y, shrink_by;
123
124 // ignore first 2 frames - they may be empty
e16e23d7 125 if (++s->frame_nb > 0) {
68b79bfc 126 // Reset the crop area every reset_count frames, if reset_count is > 0
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127 if (s->reset_count > 0 && s->frame_nb > s->reset_count) {
128 s->x1 = frame->width - 1;
129 s->y1 = frame->height - 1;
130 s->x2 = 0;
131 s->y2 = 0;
132 s->frame_nb = 1;
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133 }
134
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135 for (y = 0; y < s->y1; y++) {
136 if (checkline(ctx, frame->data[0] + frame->linesize[0] * y, bpp, frame->width, bpp) > s->limit) {
137 s->y1 = y;
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138 break;
139 }
140 }
141
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142 for (y = frame->height - 1; y > s->y2; y--) {
143 if (checkline(ctx, frame->data[0] + frame->linesize[0] * y, bpp, frame->width, bpp) > s->limit) {
144 s->y2 = y;
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145 break;
146 }
147 }
148
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149 for (y = 0; y < s->x1; y++) {
150 if (checkline(ctx, frame->data[0] + bpp*y, frame->linesize[0], frame->height, bpp) > s->limit) {
151 s->x1 = y;
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152 break;
153 }
154 }
155
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156 for (y = frame->width - 1; y > s->x2; y--) {
157 if (checkline(ctx, frame->data[0] + bpp*y, frame->linesize[0], frame->height, bpp) > s->limit) {
158 s->x2 = y;
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159 break;
160 }
161 }
162
163 // round x and y (up), important for yuv colorspaces
164 // make sure they stay rounded!
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165 x = (s->x1+1) & ~1;
166 y = (s->y1+1) & ~1;
68b79bfc 167
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168 w = s->x2 - x + 1;
169 h = s->y2 - y + 1;
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170
171 // w and h must be divisible by 2 as well because of yuv
172 // colorspace problems.
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173 if (s->round <= 1)
174 s->round = 16;
175 if (s->round % 2)
176 s->round *= 2;
68b79bfc 177
e16e23d7 178 shrink_by = w % s->round;
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179 w -= shrink_by;
180 x += (shrink_by/2 + 1) & ~1;
181
e16e23d7 182 shrink_by = h % s->round;
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183 h -= shrink_by;
184 y += (shrink_by/2 + 1) & ~1;
185
186 av_log(ctx, AV_LOG_INFO,
7e350379 187 "x1:%d x2:%d y1:%d y2:%d w:%d h:%d x:%d y:%d pts:%"PRId64" t:%f crop=%d:%d:%d:%d\n",
e16e23d7 188 s->x1, s->x2, s->y1, s->y2, w, h, x, y, frame->pts,
565e4993 189 frame->pts == AV_NOPTS_VALUE ? -1 : frame->pts * av_q2d(inlink->time_base),
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190 w, h, x, y);
191 }
192
565e4993 193 return ff_filter_frame(inlink->dst->outputs[0], frame);
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194}
195
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196#define OFFSET(x) offsetof(CropDetectContext, x)
197#define FLAGS AV_OPT_FLAG_VIDEO_PARAM
198static const AVOption options[] = {
199 { "limit", "Threshold below which the pixel is considered black", OFFSET(limit), AV_OPT_TYPE_INT, { .i64 = 24 }, 0, INT_MAX, FLAGS },
200 { "round", "Value by which the width/height should be divisible", OFFSET(round), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
201 { "reset", "Recalculate the crop area after this many frames", OFFSET(reset_count), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, FLAGS },
202 { NULL },
203};
204
205static const AVClass cropdetect_class = {
206 .class_name = "cropdetect",
207 .item_name = av_default_item_name,
208 .option = options,
209 .version = LIBAVUTIL_VERSION_INT,
210};
211
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212static const AVFilterPad avfilter_vf_cropdetect_inputs[] = {
213 {
214 .name = "default",
215 .type = AVMEDIA_TYPE_VIDEO,
216 .config_props = config_input,
217 .get_video_buffer = ff_null_get_video_buffer,
565e4993 218 .filter_frame = filter_frame,
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219 },
220 { NULL }
221};
222
223static const AVFilterPad avfilter_vf_cropdetect_outputs[] = {
224 {
225 .name = "default",
226 .type = AVMEDIA_TYPE_VIDEO
227 },
228 { NULL }
229};
230
cd43ca04 231AVFilter ff_vf_cropdetect = {
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232 .name = "cropdetect",
233 .description = NULL_IF_CONFIG_SMALL("Auto-detect crop size."),
234
235 .priv_size = sizeof(CropDetectContext),
460e7b4f 236 .priv_class = &cropdetect_class,
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237 .init = init,
238
239 .query_formats = query_formats,
240
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241 .inputs = avfilter_vf_cropdetect_inputs,
242
243 .outputs = avfilter_vf_cropdetect_outputs,
68b79bfc 244};