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print frame type and keep track of last encountered keyframe

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@19101 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
ivo 2006-07-15 10:35:22 +00:00
parent 12b3cae987
commit b6fa4fa203
2 changed files with 13 additions and 3 deletions
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3
DOCS/man/en/mplayer.1
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@ -6263,6 +6263,9 @@ Only useful with the \-ass option.
.B blackframe[=amount:threshold]
Detect frames that are (almost) completely black.
Can be useful to detect chapter transitions or commercials.
Output lines consist of the frame number of the detected frame, the
percentage of blackness, the frame type and the frame number of the last
encountered keyframe.
.RSs
.IPs <amount>
percentage of the pixels that have to be below the threshold (default: 98)

13
libmpcodecs/vf_blackframe.c
View File

@ -37,7 +37,7 @@
#include "vf.h"
struct vf_priv_s {
unsigned int bamount, bthresh, frame;
unsigned int bamount, bthresh, frame, lastkeyframe;
};
static int config(struct vf_instance_s* vf, int width, int height, int d_width,
@ -72,9 +72,11 @@ static int put_image(struct vf_instance_s* vf, mp_image_t *mpi, double pts){
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 *picttypes[4] = { "unknown", "I", "P", "B" };
for (y=1; y<=h; y++) {
for (x=0; x<w; x++)
@ -84,9 +86,13 @@ static int put_image(struct vf_instance_s* vf, mp_image_t *mpi, double pts){
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,"\nBlack frame: frame %u (%2d%%)\n",
vf->priv->frame, pblack);
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++;
@ -125,6 +131,7 @@ static int open(vf_instance_t *vf, char* args){
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);