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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 | | −}; |