| /* |
| * detect frames that are (almost) black |
| * search for black frames to detect scene transitions |
| * (c) 2006 Julian Hall |
| * |
| * based on code designed for skipping commercials |
| * (c) 2002-2003 Brian J. Murrell |
| * |
| * cleanup, simplify, speedup (c) 2006 by Ivo van Poorten |
| * |
| * This file is part of MPlayer. |
| * |
| * MPlayer is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * MPlayer 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 General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with MPlayer; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #include "config.h" |
| #include "mp_msg.h" |
| |
| #include "img_format.h" |
| #include "mp_image.h" |
| #include "vf.h" |
| |
| struct vf_priv_s { |
| unsigned int bamount, bthresh, frame, lastkeyframe; |
| }; |
| |
| static int config(struct vf_instance *vf, int width, int height, int d_width, |
| int d_height, unsigned int flags, unsigned int outfmt) { |
| return vf_next_config(vf,width,height,d_width,d_height,flags,outfmt); |
| } |
| |
| static int query_format(struct vf_instance *vf, unsigned fmt) { |
| switch(fmt) { |
| case IMGFMT_YVU9: |
| case IMGFMT_IF09: |
| case IMGFMT_YV12: |
| case IMGFMT_I420: |
| case IMGFMT_IYUV: |
| case IMGFMT_CLPL: |
| case IMGFMT_Y800: |
| case IMGFMT_Y8: |
| case IMGFMT_NV12: |
| case IMGFMT_NV21: |
| case IMGFMT_444P: |
| case IMGFMT_422P: |
| case IMGFMT_411P: |
| case IMGFMT_HM12: |
| return vf_next_query_format(vf, fmt); |
| } |
| return 0; |
| } |
| |
| static int put_image(struct vf_instance *vf, mp_image_t *mpi, double pts){ |
| mp_image_t *dmpi; |
| int x, y; |
| int nblack=0, pblack=0; |
| unsigned char *yplane = mpi->planes[0]; |
| unsigned int ystride = mpi->stride[0]; |
| int pict_type = mpi->pict_type; |
| int w = mpi->w, h = mpi->h; |
| int bthresh = vf->priv->bthresh; |
| int bamount = vf->priv->bamount; |
| static const char *const picttypes[4] = { "unknown", "I", "P", "B" }; |
| |
| for (y=1; y<=h; y++) { |
| for (x=0; x<w; x++) |
| nblack += yplane[x] < bthresh; |
| pblack = nblack*100/(w*y); |
| if (pblack < bamount) break; |
| yplane += ystride; |
| } |
| |
| if (pict_type > 3 || pict_type < 0) pict_type = 0; |
| if (pict_type == 1) vf->priv->lastkeyframe = vf->priv->frame; |
| |
| if (pblack >= bamount) |
| mp_msg(MSGT_VFILTER, MSGL_INFO,"vf_blackframe: %u, %i%%, %s (I:%u)\n", |
| vf->priv->frame, pblack, picttypes[pict_type], |
| vf->priv->lastkeyframe); |
| |
| vf->priv->frame++; |
| |
| dmpi = vf_get_image(vf->next, mpi->imgfmt, MP_IMGTYPE_EXPORT, 0, |
| mpi->width, mpi->height); |
| dmpi->planes[0] = mpi->planes[0]; |
| dmpi->stride[0] = mpi->stride[0]; |
| dmpi->planes[1] = mpi->planes[1]; |
| dmpi->stride[1] = mpi->stride[1]; |
| dmpi->planes[2] = mpi->planes[2]; |
| dmpi->stride[2] = mpi->stride[2]; |
| |
| vf_clone_mpi_attributes(dmpi, mpi); |
| |
| return vf_next_put_image(vf, dmpi, pts); |
| } |
| |
| static int control(struct vf_instance *vf, int request, void* data){ |
| return vf_next_control(vf,request,data); |
| } |
| |
| static void uninit(struct vf_instance *vf) { |
| free(vf->priv); |
| } |
| |
| static int vf_open(vf_instance_t *vf, char *args){ |
| vf->priv = malloc(sizeof(struct vf_priv_s)); |
| if (!vf->priv) return 0; |
| |
| vf->config = config; |
| vf->put_image = put_image; |
| vf->control = control; |
| vf->uninit = uninit; |
| vf->query_format = query_format; |
| |
| vf->priv->bamount = 98; |
| vf->priv->bthresh = 0x20; |
| vf->priv->frame = 0; |
| vf->priv->lastkeyframe = 0; |
| |
| if (args) |
| sscanf(args, "%u:%u", &vf->priv->bamount, &vf->priv->bthresh); |
| return 1; |
| } |
| |
| const vf_info_t vf_info_blackframe = { |
| "detects black frames", |
| "blackframe", |
| "Brian J. Murrell, Julian Hall, Ivo van Poorten", |
| "Useful for detecting scene transitions", |
| vf_open, |
| NULL |
| }; |