mirror of
https://github.com/mpv-player/mpv
synced 2024-12-17 20:34:58 +00:00
280fa83b42
patch by Daniele Forghieri ( guru@digitalfantasy.it ) (little cleanup by me) git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@10752 b3059339-0415-0410-9bf9-f77b7e298cf2
194 lines
5.1 KiB
C
194 lines
5.1 KiB
C
/*
|
|
* vf_fstep.c - filter to ouput only 1 every n frame, or only the I (key)
|
|
* frame
|
|
*
|
|
* The parameters are:
|
|
*
|
|
* [I] | [i]num
|
|
*
|
|
* if you call the filter with I (uppercase) as the parameter
|
|
* ... -vf framestep=I ...
|
|
* then ONLY the keyframes are outputted.
|
|
* For DVD it means, generally, one every 15 frames (IBBPBBPBBPBBPBB), for avi it means
|
|
* every scene change or every keyint value (see -lavcopts).
|
|
*
|
|
* if you call the filter with the i (lowercase)
|
|
* ... -vf framestep=i ...
|
|
* then a I! followed by a cr is printed when a key frame (eg Intra frame) is
|
|
* found, leaving the current line of mplayer/mencoder, where you got the
|
|
* time, in seconds, and frame of the key. Use this information to split the
|
|
* AVI.
|
|
*
|
|
* After the i or alone you can put a positive number and only one frame every
|
|
* x (the number you set) is passed on the filter chain, limiting the output
|
|
* of the frame.
|
|
*
|
|
* Example
|
|
* ... -vf framestep=i20 ...
|
|
* Dump one every 20 frames, printing on the console when a I-Frame is encounter.
|
|
*
|
|
* ... -vf framestep=25
|
|
* Dump one every 25 frames.
|
|
*
|
|
* If you call the filter without parameter it does nothing (except using memory
|
|
* and resource of your system,. of course).
|
|
*
|
|
* This filter doesn' t work like the option -sstep seconds.
|
|
*
|
|
* The -sstep seek to the new position, without decoding all frames but,
|
|
* expecially on avi file coded whith mpeg4 (lavc or xvid or divx), the
|
|
* seek is not always too much precise.
|
|
*
|
|
* This filter simply discard the unwanted frames, so you are very precise in
|
|
* counting the frame but sometime you use a lot of CPU for nothing.
|
|
*
|
|
* As usual it depends on what you're doing.
|
|
*
|
|
* Daniele Forghieri ( guru@digitalfantasy.it )
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "../config.h"
|
|
#include "../mp_msg.h"
|
|
#include "../cpudetect.h"
|
|
|
|
#include "img_format.h"
|
|
#include "mp_image.h"
|
|
#include "vf.h"
|
|
|
|
#include "../libvo/fastmemcpy.h"
|
|
|
|
/* Uncomment if you want to print some info on the format */
|
|
// #define DUMP_FORMAT_DATA
|
|
|
|
/* Private data */
|
|
struct vf_priv_s {
|
|
/* Current frame */
|
|
int frame_cur;
|
|
/* Frame output step, 0 = all */
|
|
int frame_step;
|
|
/* Only I-Frame (2), print on I-Frame (1) */
|
|
int dump_iframe;
|
|
};
|
|
|
|
/* Filter handler */
|
|
static int put_image(struct vf_instance_s* vf, mp_image_t *mpi)
|
|
{
|
|
mp_image_t *dmpi;
|
|
struct vf_priv_s *priv;
|
|
int skip;
|
|
|
|
priv = vf->priv;
|
|
|
|
/* Print the 'I' if is a intra frame. The \n advance the current line so you got the
|
|
* current file time (in second) and the frame number on the console ;-)
|
|
*/
|
|
if (priv->dump_iframe) {
|
|
if (mpi->pict_type == 1) {
|
|
printf("I!\n");
|
|
}
|
|
}
|
|
|
|
/* decide if frame must be shown */
|
|
if (priv->dump_iframe == 2) {
|
|
/* Only key frame */
|
|
skip = mpi->pict_type == 1 ? 0 : 1;
|
|
}
|
|
else {
|
|
/* Only 1 every frame_step */
|
|
skip = 0;
|
|
if ((priv->frame_step != 0) && ((priv->frame_cur % priv->frame_step) != 0)) {
|
|
skip = 1;
|
|
}
|
|
}
|
|
/* Increment current frame */
|
|
++priv->frame_cur;
|
|
|
|
if (skip == 0) {
|
|
/* Get image, export type (we don't modify tghe image) */
|
|
dmpi=vf_get_image(vf->next, mpi->imgfmt,
|
|
MP_IMGTYPE_EXPORT, 0,
|
|
mpi->w, mpi->h);
|
|
/* Copy only the pointer ( MP_IMGTYPE_EXPORT ! ) */
|
|
dmpi->planes[0] = mpi->planes[0];
|
|
dmpi->planes[1] = mpi->planes[1];
|
|
dmpi->planes[2] = mpi->planes[2];
|
|
|
|
dmpi->stride[0] = mpi->stride[0];
|
|
dmpi->stride[1] = mpi->stride[1];
|
|
dmpi->stride[2] = mpi->stride[2];
|
|
|
|
dmpi->width = mpi->width;
|
|
dmpi->height = mpi->height;
|
|
|
|
/* Chain to next filter / output ... */
|
|
return vf_next_put_image(vf, dmpi);
|
|
}
|
|
|
|
/* Skip the frame */
|
|
return 0;
|
|
}
|
|
|
|
static void uninit(struct vf_instance_s* vf)
|
|
{
|
|
/* Free private data */
|
|
free(vf->priv);
|
|
}
|
|
|
|
/* Main entry funct for the filter */
|
|
static int open(vf_instance_t *vf, char* args)
|
|
{
|
|
struct vf_priv_s *p;
|
|
|
|
vf->put_image = put_image;
|
|
vf->uninit = uninit;
|
|
vf->default_reqs = VFCAP_ACCEPT_STRIDE;
|
|
vf->priv = p = calloc(1, sizeof(struct vf_priv_s));
|
|
if (p == NULL) {
|
|
return(0);
|
|
}
|
|
|
|
if (args != NULL) {
|
|
#ifdef DUMP_FORMAT_DATA
|
|
if (*args == 'd') {
|
|
p->dump_iframe = 3;
|
|
}
|
|
else
|
|
#endif
|
|
if (*args == 'I') {
|
|
/* Dump only KEY (ie INTRA) frame */
|
|
p->dump_iframe = 2;
|
|
}
|
|
else {
|
|
if (*args == 'i') {
|
|
/* Print a 'I!' when a i-frame is encounter */
|
|
p->dump_iframe = 1;
|
|
++args;
|
|
}
|
|
|
|
if (*args != '\0') {
|
|
p->frame_step = atoi(args);
|
|
if (p->frame_step <= 0) {
|
|
printf("Error parsing argument\n");
|
|
return(0);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
vf_info_t vf_info_framestep = {
|
|
"Dump one every n / key frames",
|
|
"framestep",
|
|
"Daniele Forghieri",
|
|
"",
|
|
open,
|
|
NULL
|
|
};
|
|
|
|
|