From ca7cbc07244e261910cd651e2005bd6a9a7132be Mon Sep 17 00:00:00 2001
From: greg <greg@b3059339-0415-0410-9bf9-f77b7e298cf2>
Date: Fri, 5 Mar 2010 23:13:08 +0000
Subject: Enable ASS/SSA subtitle support in mencoder

Enable ASS/SSA rendering through libass in mencoder. This duplicates a
bit of code (to parse font attachments, for example). Additionally, add
a filter "fixpts" that generates PTS, simulating fixed fps. PTS
generated by this filter are then used for subtitle timing.

Original patch by Nicolas George. (nicolas.george normalesup.org)

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@30849 b3059339-0415-0410-9bf9-f77b7e298cf2
---
 libmpcodecs/vf_fixpts.c | 137 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 libmpcodecs/vf_fixpts.c

(limited to 'libmpcodecs/vf_fixpts.c')

diff --git a/libmpcodecs/vf_fixpts.c b/libmpcodecs/vf_fixpts.c
new file mode 100644
index 0000000000..5ceb516c6b
--- /dev/null
+++ b/libmpcodecs/vf_fixpts.c
@@ -0,0 +1,137 @@
+/*
+ * 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 <inttypes.h>
+
+#include "config.h"
+#include "mp_msg.h"
+#include "help_mp.h"
+
+#include "img_format.h"
+#include "mp_image.h"
+#include "vf.h"
+
+struct vf_priv_s {
+    double current;
+    double step;
+    int autostart;
+    int autostep;
+    unsigned have_step:1;
+    unsigned print:1;
+};
+
+static int put_image(vf_instance_t *vf, mp_image_t *src, double pts)
+{
+    struct vf_priv_s *p = vf->priv;
+
+    if (p->print) {
+        if (pts == MP_NOPTS_VALUE)
+            mp_msg(MSGT_VFILTER, MSGL_INFO, "PTS: undef\n");
+        else
+            mp_msg(MSGT_VFILTER, MSGL_INFO, "PTS: %f\n", pts);
+    }
+    if (pts != MP_NOPTS_VALUE && p->autostart != 0) {
+        p->current = pts;
+        if (p->autostart > 0)
+            p->autostart--;
+    } else if (pts != MP_NOPTS_VALUE && p->autostep > 0) {
+        p->step = pts - p->current;
+        p->current = pts;
+        p->autostep--;
+        p->have_step = 1;
+    } else if (p->have_step) {
+        p->current += p->step;
+        pts = p->current;
+    } else {
+        pts = MP_NOPTS_VALUE;
+    }
+    return vf_next_put_image(vf, src, pts);
+}
+
+static void uninit(vf_instance_t *vf)
+{
+    free(vf->priv);
+}
+
+static int parse_args(struct vf_priv_s *p, const char *args)
+{
+    int pos;
+    double num, denom = 1;
+    int iarg;
+
+    while (*args != 0) {
+        pos = 0;
+        if (sscanf(args, "print%n", &pos) == 0 && pos > 0) {
+            p->print = 1;
+        } else if (sscanf(args, "fps=%lf%n/%lf%n", &num, &pos, &denom, &pos) >=
+                   1 && pos > 0) {
+            p->step = denom / num;
+            p->have_step = 1;
+        } else if (sscanf(args, "start=%lf%n", &num, &pos) >= 1 && pos > 0) {
+            p->current = num;
+        } else if (sscanf(args, "autostart=%d%n", &iarg, &pos) == 1 && pos > 0) {
+            p->autostart = iarg;
+        } else if (sscanf(args, "autofps=%d%n", &iarg, &pos) == 1 && pos > 0) {
+            p->autostep = iarg;
+        } else {
+            mp_msg(MSGT_VFILTER, MSGL_FATAL,
+                   "fixpts: unknown suboption: %s\n", args);
+            return 0;
+        }
+        args += pos;
+        if (*args == ':')
+            args++;
+    }
+    return 1;
+}
+
+static int open(vf_instance_t *vf, char *args)
+{
+    struct vf_priv_s *p;
+    struct vf_priv_s ptmp = {
+        .current = 0,
+        .step = 0,
+        .autostart = 0,
+        .autostep = 0,
+        .have_step = 0,
+        .print = 0,
+    };
+
+    if (!parse_args(&ptmp, args == NULL ? "" : args))
+        return 0;
+
+    vf->put_image = put_image;
+    vf->uninit = uninit;
+    vf->priv = p = malloc(sizeof(struct vf_priv_s));
+    *p = ptmp;
+    p->current = -p->step;
+
+    return 1;
+}
+
+vf_info_t vf_info_fixpts = {
+    "Fix presentation timestamps",
+    "fixpts",
+    "Nicolas George",
+    "",
+    &open,
+    NULL
+};
-- 
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