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