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- /*
- * filter to output 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.
- *
- * copyright (c) 2003 Daniele Forghieri ( guru@digitalfantasy.it )
- *
- * 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 "help_mp.h"
- #include "cpudetect.h"
- #include "img_format.h"
- #include "mp_image.h"
- #include "vf.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 *vf, mp_image_t *mpi, double pts)
- {
- 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) {
- mp_msg(MSGT_VFILTER, MSGL_INFO, "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, pts);
- }
- /* Skip the frame */
- return 0;
- }
- static void uninit(struct vf_instance *vf)
- {
- /* Free private data */
- free(vf->priv);
- }
- /* Main entry funct for the filter */
- static int vf_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) {
- mp_msg(MSGT_VFILTER, MSGL_WARN, MSGTR_MPCODECS_ErrorParsingArgument);
- return 0;
- }
- }
- }
- }
- return 1;
- }
- const vf_info_t vf_info_framestep = {
- "Dump one every n / key frames",
- "framestep",
- "Daniele Forghieri",
- "",
- vf_open,
- NULL
- };
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