2 new filters: tile & framestep

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

1 files changed, 193 insertions, 0 deletions

diff --git a/libmpcodecs/vf_framestep.c b/libmpcodecs/vf_framestep.c
new file mode 100644
index 0000000000..3586a99103
--- /dev/null
+++ b/libmpcodecs/vf_framestep.c
@@ -0,0 +1,193 @@
+/*
+ * 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
+};
+
+