2 * detect frames that are (almost) black
3 * search for black frames to detect scene transitions
6 * based on code designed for skipping commercials
7 * (c) 2002-2003 Brian J. Murrell
9 * cleanup, simplify, speedup (c) 2006 by Ivo van Poorten
11 * This file is part of MPlayer.
13 * MPlayer is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * MPlayer is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License along
24 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
25 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
35 #include "img_format.h"
40 unsigned int bamount, bthresh, frame, lastkeyframe;
43 static int config(struct vf_instance *vf, int width, int height, int d_width,
44 int d_height, unsigned int flags, unsigned int outfmt) {
45 return vf_next_config(vf,width,height,d_width,d_height,flags,outfmt);
48 static int query_format(struct vf_instance *vf, unsigned fmt) {
64 return vf_next_query_format(vf, fmt);
69 static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts){
72 int nblack=0, pblack=0;
73 unsigned char *yplane = mpi->planes[0];
74 unsigned int ystride = mpi->stride[0];
75 int pict_type = mpi->pict_type;
76 int w = mpi->w, h = mpi->h;
77 int bthresh = vf->priv->bthresh;
78 int bamount = vf->priv->bamount;
79 static const char *const picttypes[4] = { "unknown", "I", "P", "B" };
81 for (y=1; y<=h; y++) {
83 nblack += yplane[x] < bthresh;
84 pblack = nblack*100/(w*y);
85 if (pblack < bamount) break;
89 if (pict_type > 3 || pict_type < 0) pict_type = 0;
90 if (pict_type == 1) vf->priv->lastkeyframe = vf->priv->frame;
92 if (pblack >= bamount)
93 mp_msg(MSGT_VFILTER, MSGL_INFO,"vf_blackframe: %u, %i%%, %s (I:%u)\n",
94 vf->priv->frame, pblack, picttypes[pict_type],
95 vf->priv->lastkeyframe);
99 dmpi = vf_get_image(vf->next, mpi->imgfmt, MP_IMGTYPE_EXPORT, 0,
100 mpi->width, mpi->height);
101 dmpi->planes[0] = mpi->planes[0];
102 dmpi->stride[0] = mpi->stride[0];
103 dmpi->planes[1] = mpi->planes[1];
104 dmpi->stride[1] = mpi->stride[1];
105 dmpi->planes[2] = mpi->planes[2];
106 dmpi->stride[2] = mpi->stride[2];
108 vf_clone_mpi_attributes(dmpi, mpi);
110 return vf_next_put_image(vf, dmpi, pts);
113 static int control(struct vf_instance *vf, int request, void* data){
114 return vf_next_control(vf,request,data);
117 static void uninit(struct vf_instance *vf) {
121 static int vf_open(vf_instance_t *vf, char *args){
122 vf->priv = malloc(sizeof(struct vf_priv_s));
123 if (!vf->priv) return 0;
126 vf->put_image = put_image;
127 vf->control = control;
129 vf->query_format = query_format;
131 vf->priv->bamount = 98;
132 vf->priv->bthresh = 0x20;
134 vf->priv->lastkeyframe = 0;
137 sscanf(args, "%u:%u", &vf->priv->bamount, &vf->priv->bthresh);
141 const vf_info_t vf_info_blackframe = {
142 "detects black frames",
144 "Brian J. Murrell, Julian Hall, Ivo van Poorten",
145 "Useful for detecting scene transitions",