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mpv/sub/ass_mp.c

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/*
* 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);
}
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