sub/OSD: move some related files to sub/

1 files changed, 355 insertions, 0 deletions

diff --git a/sub/ass_mp.c b/sub/ass_mp.c
new file mode 100644
index 0000000000..98602ace03
--- /dev/null
+++ b/sub/ass_mp.c
@@ -0,0 +1,355 @@
+/*
+ * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
+ *
+ * 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 libass; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <inttypes.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <stdbool.h>
+
+#include <ass/ass.h>
+#include <ass/ass_types.h>
+
+#include <libavutil/common.h>
+
+#include "config.h"
+#include "mp_msg.h"
+#include "path.h"
+#include "ass_mp.h"
+#include "subreader.h"
+#include "stream/stream.h"
+
+#ifdef CONFIG_FONTCONFIG
+#include <fontconfig/fontconfig.h>
+#endif
+
+// libass-related command line options
+ASS_Library *ass_library;
+float ass_font_scale = 1.;
+float ass_line_spacing = 0.;
+int ass_top_margin = 0;
+int ass_bottom_margin = 0;
+int use_embedded_fonts = 1;
+char **ass_force_style_list = NULL;
+int ass_use_margins = 0;
+char *ass_color = NULL;
+char *ass_border_color = NULL;
+char *ass_styles_file = NULL;
+int ass_hinting = ASS_HINTING_LIGHT + 4;       // light hinting for unscaled osd
+
+#ifdef CONFIG_FONTCONFIG
+extern int font_fontconfig;
+#else
+static int font_fontconfig = -1;
+#endif
+extern char *font_name;
+extern char *sub_font_name;
+extern float text_font_scale_factor;
+extern int subtitle_autoscale;
+
+#ifdef CONFIG_ICONV
+extern char *sub_cp;
+#else
+static char *sub_cp = 0;
+#endif
+
+ASS_Track *mp_ass_default_track(ASS_Library *library)
+{
+    ASS_Track *track = ass_new_track(library);
+
+    track->track_type = TRACK_TYPE_ASS;
+    track->Timer = 100.;
+    track->PlayResY = 288;
+    track->WrapStyle = 0;
+
+    if (ass_styles_file)
+        ass_read_styles(track, ass_styles_file, sub_cp);
+
+    if (track->n_styles == 0) {
+        track->Kerning = true;
+        int sid = ass_alloc_style(track);
+        ASS_Style *style = track->styles + sid;
+        style->Name = strdup("Default");
+        style->FontName = (font_fontconfig >= 0
+                           && sub_font_name) ? strdup(sub_font_name)
+            : (font_fontconfig >= 0
+               && font_name) ? strdup(font_name) : strdup("Sans");
+        style->treat_fontname_as_pattern = 1;
+
+        double fs = track->PlayResY * text_font_scale_factor / 100.;
+        /* The font size is always proportional to video height only;
+         * real -subfont-autoscale behavior is not implemented.
+         * Apply a correction that corresponds to about 4:3 aspect ratio
+         * video to get a size somewhat closer to what non-libass rendering
+         * would produce with the same text_font_scale_factor
+         * and subtitle_autoscale.
+         */
+        if (subtitle_autoscale == 2)
+            fs *= 1.3;
+        else if (subtitle_autoscale == 3)
+            fs *= 1.7;
+
+        uint32_t c1 = 0xFFFFFF00;
+        uint32_t c2 = 0x00000000;
+        if (ass_color)
+            c1 = strtoll(ass_color, NULL, 16);
+        if (ass_border_color)
+            c2 = strtoll(ass_border_color, NULL, 16);
+
+        style->FontSize = fs;
+        style->PrimaryColour = c1;
+        style->SecondaryColour = c1;
+        style->OutlineColour = c2;
+        style->BackColour = 0x00000000;
+        style->BorderStyle = 1;
+        style->Alignment = 2;
+        style->Outline = fs / 16;
+        style->MarginL = 10;
+        style->MarginR = 10;
+        style->MarginV = 5;
+        style->ScaleX = 1.;
+        style->ScaleY = 1.;
+    }
+
+    ass_process_force_style(track);
+    return track;
+}
+
+static int check_duplicate_plaintext_event(ASS_Track *track)
+{
+    int i;
+    ASS_Event *evt = track->events + track->n_events - 1;
+
+    for (i = 0; i < track->n_events - 1; ++i)   // ignoring last event, it is the one we are comparing with
+        if (track->events[i].Start == evt->Start &&
+            track->events[i].Duration == evt->Duration &&
+            strcmp(track->events[i].Text, evt->Text) == 0)
+            return 1;
+    return 0;
+}
+
+/**
+ * \brief Convert subtitle to ASS_Events for the given track
+ * \param track track
+ * \param sub subtitle to convert
+ * \return event id
+ * note: assumes that subtitle is _not_ fps-based; caller must manually correct
+ *   Start and Duration in other case.
+ **/
+static int ass_process_subtitle(ASS_Track *track, subtitle *sub)
+{
+    int eid;
+    ASS_Event *event;
+    int len = 0, j;
+    char *p;
+    char *end;
+
+    eid = ass_alloc_event(track);
+    event = track->events + eid;
+
+    event->Start = sub->start * 10;
+    event->Duration = (sub->end - sub->start) * 10;
+    event->Style = 0;
+
+    for (j = 0; j < sub->lines; ++j)
+        len += sub->text[j] ? strlen(sub->text[j]) : 0;
+
+    len += 2 * sub->lines;      // '\N', including the one after the last line
+    len += 6;                   // {\anX}
+    len += 1;                   // '\0'
+
+    event->Text = malloc(len);
+    end = event->Text + len;
+    p = event->Text;
+
+    if (sub->alignment)
+        p += snprintf(p, end - p, "{\\an%d}", sub->alignment);
+
+    for (j = 0; j < sub->lines; ++j)
+        p += snprintf(p, end - p, "%s\\N", sub->text[j]);
+
+    if (sub->lines > 0)
+        p -= 2;                 // remove last "\N"
+    *p = 0;
+
+    if (check_duplicate_plaintext_event(track)) {
+        ass_free_event(track, eid);
+        track->n_events--;
+        return -1;
+    }
+
+    mp_msg(MSGT_ASS, MSGL_V,
+           "plaintext event at %" PRId64 ", +%" PRId64 ": %s  \n",
+           (int64_t) event->Start, (int64_t) event->Duration, event->Text);
+
+    return eid;
+}
+
+
+/**
+ * \brief Convert subdata to ASS_Track
+ * \param subdata subtitles struct from subreader
+ * \param fps video framerate
+ * \return newly allocated ASS_Track, filled with subtitles from subdata
+ */
+ASS_Track *mp_ass_read_subdata(ASS_Library *library, sub_data *subdata,
+                               double fps)
+{
+    ASS_Track *track;
+    int i;
+
+    track = mp_ass_default_track(library);
+    track->name = subdata->filename ? strdup(subdata->filename) : 0;
+
+    for (i = 0; i < subdata->sub_num; ++i) {
+        int eid = ass_process_subtitle(track, subdata->subtitles + i);
+        if (eid < 0)
+            continue;
+        if (!subdata->sub_uses_time) {
+            track->events[eid].Start *= 100. / fps;
+            track->events[eid].Duration *= 100. / fps;
+        }
+    }
+    return track;
+}
+
+ASS_Track *mp_ass_read_stream(ASS_Library *library, const char *fname,
+                              char *charset)
+{
+    int i;
+    char *buf = NULL;
+    ASS_Track *track;
+    size_t sz = 0;
+    size_t buf_alloc = 0;
+    stream_t *fd;
+
+    fd = open_stream(fname, NULL, NULL);
+    if (!fd)
+        // Stream code should have printed an error already
+        return NULL;
+    if (fd->end_pos > STREAM_BUFFER_SIZE)
+        /* read entire file if size is known */
+        buf_alloc = fd->end_pos;
+    else
+        buf_alloc = 1000;
+    for (;;) {
+        if (sz > 100000000) {
+            mp_tmsg(MSGT_ASS, MSGL_ERR, "Refusing to load subtitle file "
+                    "larger than 100 MB: %s\n", fname);
+            sz = 0;
+            break;
+        }
+        buf_alloc = FFMAX(buf_alloc, sz + (sz >> 1));
+        buf_alloc = FFMIN(buf_alloc, 100000001);
+        buf = realloc(buf, buf_alloc + 1);
+        i = stream_read(fd, buf + sz, buf_alloc - sz);
+        if (i <= 0)
+            break;
+        sz += i;
+    }
+    free_stream(fd);
+    if (!sz) {
+        free(buf);
+        return NULL;
+    }
+    buf[sz] = 0;
+    buf = realloc(buf, sz + 1);
+    track = ass_read_memory(library, buf, sz, charset);
+    if (track) {
+        free(track->name);
+        track->name = strdup(fname);
+    }
+    free(buf);
+    return track;
+}
+
+void mp_ass_configure(ASS_Renderer *priv, int w, int h, bool unscaled)
+{
+    int hinting;
+    ass_set_frame_size(priv, w, h);
+    ass_set_margins(priv, ass_top_margin, ass_bottom_margin, 0, 0);
+    ass_set_use_margins(priv, ass_use_margins);
+    ass_set_font_scale(priv, ass_font_scale);
+    if (!unscaled && (ass_hinting & 4))
+        hinting = 0;
+    else
+        hinting = ass_hinting & 3;
+    ass_set_hinting(priv, hinting);
+    ass_set_line_spacing(priv, ass_line_spacing);
+}
+
+void mp_ass_configure_fonts(ASS_Renderer *priv)
+{
+    char *dir, *path, *family;
+    dir = get_path("fonts");
+    if (font_fontconfig < 0 && sub_font_name)
+        path = strdup(sub_font_name);
+    else if (font_fontconfig < 0 && font_name)
+        path = strdup(font_name);
+    else
+        path = get_path("subfont.ttf");
+    if (font_fontconfig >= 0 && sub_font_name)
+        family = strdup(sub_font_name);
+    else if (font_fontconfig >= 0 && font_name)
+        family = strdup(font_name);
+    else
+        family = 0;
+
+    ass_set_fonts(priv, path, family, font_fontconfig + 1, NULL, 1);
+
+    free(dir);
+    free(path);
+    free(family);
+}
+
+static void message_callback(int level, const char *format, va_list va, void *ctx)
+{
+    mp_msg(MSGT_ASS, level, "[ass] ");
+    mp_msg_va(MSGT_ASS, level, format, va);
+    // libass messages lack trailing \n
+    mp_msg(MSGT_ASS, level, "\n");
+}
+
+ASS_Library *mp_ass_init(void)
+{
+    ASS_Library *priv;
+    char *path = get_path("fonts");
+    priv = ass_library_init();
+    ass_set_message_cb(priv, message_callback, NULL);
+    ass_set_fonts_dir(priv, path);
+    ass_set_extract_fonts(priv, use_embedded_fonts);
+    ass_set_style_overrides(priv, ass_force_style_list);
+    free(path);
+    return priv;
+}
+
+int ass_force_reload = 0;       // flag set if global ass-related settings were changed
+
+ASS_Image *mp_ass_render_frame(ASS_Renderer *priv, ASS_Track *track,
+                               long long now, int *detect_change)
+{
+    if (ass_force_reload) {
+        ass_set_margins(priv, ass_top_margin, ass_bottom_margin, 0, 0);
+        ass_set_use_margins(priv, ass_use_margins);
+        ass_set_font_scale(priv, ass_font_scale);
+        ass_force_reload = 0;
+    }
+    return ass_render_frame(priv, track, now, detect_change);
+}