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| 1 | /* | | |
| 2 | * detect frames that are (almost) black | | |
| 3 | * search for black frames to detect scene transitions | | |
| 4 | * (c) 2006 Julian Hall | | |
| 5 | * | | |
| 6 | * based on code designed for skipping commercials | | |
| 7 | * (c) 2002-2003 Brian J. Murrell | | |
| 8 | * | | |
| 9 | * cleanup, simplify, speedup (c) 2006 by Ivo van Poorten | | |
| 10 | * | | |
| 11 | * This file is part of MPlayer. | | |
| 12 | * | | |
| 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. | | |
| 17 | * | | |
| 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. | | |
| 22 | * | | |
| 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. | | |
| 26 | */ | | |
| 27 | | | |
| 28 | #include <stdio.h> | | |
| 29 | #include <stdlib.h> | | |
| 30 | #include <string.h> | | |
| 31 | | | |
| 32 | #include "config.h" | | |
| 33 | #include "mp_msg.h" | | |
| 34 | | | |
| 35 | #include "img_format.h" | | |
| 36 | #include "mp_image.h" | | |
| 37 | #include "vf.h" | | |
| 38 | | | |
| 39 | struct vf_priv_s { | | |
| 40 | unsigned int bamount, bthresh, frame, lastkeyframe; | | |
| 41 | }; | | |
| 42 | | | |
| 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); | | |
| 46 | } | | |
| 47 | | | |
| 48 | static int query_format(struct vf_instance *vf, unsigned fmt) { | | |
| 49 | switch(fmt) { | | |
| 50 | case IMGFMT_YVU9: | | |
| 51 | case IMGFMT_IF09: | | |
| 52 | case IMGFMT_YV12: | | |
| 53 | case IMGFMT_I420: | | |
| 54 | case IMGFMT_IYUV: | | |
| 55 | case IMGFMT_CLPL: | | |
| 56 | case IMGFMT_Y800: | | |
| 57 | case IMGFMT_Y8: | | |
| 58 | case IMGFMT_NV12: | | |
| 59 | case IMGFMT_NV21: | | |
| 60 | case IMGFMT_444P: | | |
| 61 | case IMGFMT_422P: | | |
| 62 | case IMGFMT_411P: | | |
| 63 | case IMGFMT_HM12: | | |
| 64 | return vf_next_query_format(vf, fmt); | | |
| 65 | } | | |
| 66 | return 0; | | |
| 67 | } | | |
| 68 | | | |
| 69 | static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts){ | | |
| 70 | mp_image_t *dmpi; | | |
| 71 | int x, y; | | |
| 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" }; | | |
| 80 | | | |
| 81 | for (y=1; y<=h; y++) { | | |
| 82 | for (x=0; x<w; x++) | | |
| 83 | nblack += yplane[x] < bthresh; | | |
| 84 | pblack = nblack*100/(w*y); | | |
| 85 | if (pblack < bamount) break; | | |
| 86 | yplane += ystride; | | |
| 87 | } | | |
| 88 | | | |
| 89 | if (pict_type > 3 || pict_type < 0) pict_type = 0; | | |
| 90 | if (pict_type == 1) vf->priv->lastkeyframe = vf->priv->frame; | | |
| 91 | | | |
| 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); | | |
| 96 | | | |
| 97 | vf->priv->frame++; | | |
| 98 | | | |
| 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]; | | |
| 107 | | | |
| 108 | vf_clone_mpi_attributes(dmpi, mpi); | | |
| 109 | | | |
| 110 | return vf_next_put_image(vf, dmpi, pts); | | |
| 111 | } | | |
| 112 | | | |
| 113 | static int control(struct vf_instance *vf, int request, void* data){ | | |
| 114 | return vf_next_control(vf,request,data); | | |
| 115 | } | | |
| 116 | | | |
| 117 | static void uninit(struct vf_instance *vf) { | | |
| 118 | free(vf->priv); | | |
| 119 | } | | |
| 120 | | | |
| 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; | | |
| 124 | | | |
| 125 | vf->config = config; | | |
| 126 | vf->put_image = put_image; | | |
| 127 | vf->control = control; | | |
| 128 | vf->uninit = uninit; | | |
| 129 | vf->query_format = query_format; | | |
| 130 | | | |
| 131 | vf->priv->bamount = 98; | | |
| 132 | vf->priv->bthresh = 0x20; | | |
| 133 | vf->priv->frame = 0; | | |
| 134 | vf->priv->lastkeyframe = 0; | | |
| 135 | | | |
| 136 | if (args) | | |
| 137 | sscanf(args, "%u:%u", &vf->priv->bamount, &vf->priv->bthresh); | | |
| 138 | return 1; | | |
| 139 | } | | |
| 140 | | | |
| 141 | const vf_info_t vf_info_blackframe = { | | |
| 142 | "detects black frames", | | |
| 143 | "blackframe", | | |
| 144 | "Brian J. Murrell, Julian Hall, Ivo van Poorten", | | |
| 145 | "Useful for detecting scene transitions", | | |
| 146 | vf_open, | | |
| 147 | NULL | | |
| 148 | }; | | |