mpv/libass/ass_mp.c

326 lines
8.6 KiB
C

// -*- c-basic-offset: 8; indent-tabs-mode: t -*-
// vim:ts=8:sw=8:noet:ai:
/*
* Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
*
* This file is part of libass.
*
* libass 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.
*
* libass 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 "mp_msg.h"
#include "get_path.h"
#include "ass_mp.h"
#include "help_mp.h"
#include "stream/stream.h"
#ifdef CONFIG_FONTCONFIG
#include <fontconfig/fontconfig.h>
#endif
// libass-related command line options
ass_library_t* ass_library;
int ass_enabled = 0;
float ass_font_scale = 1.;
float ass_line_spacing = 0.;
int ass_top_margin = 0;
int ass_bottom_margin = 0;
#if defined(FC_VERSION) && (FC_VERSION >= 20402)
int extract_embedded_fonts = 1;
#else
int extract_embedded_fonts = 0;
#endif
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_NATIVE + 4; // native 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_t* ass_default_track(ass_library_t* library) {
ass_track_t* 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) {
ass_style_t* style;
int sid;
double fs;
uint32_t c1, c2;
sid = ass_alloc_style(track);
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;
fs = track->PlayResY * text_font_scale_factor / 100.;
// approximate autoscale coefficients
if (subtitle_autoscale == 2)
fs *= 1.3;
else if (subtitle_autoscale == 3)
fs *= 1.4;
style->FontSize = fs;
if (ass_color) c1 = strtoll(ass_color, NULL, 16);
else c1 = 0xFFFF0000;
if (ass_border_color) c2 = strtoll(ass_border_color, NULL, 16);
else c2 = 0x00000000;
style->PrimaryColour = c1;
style->SecondaryColour = c1;
style->OutlineColour = c2;
style->BackColour = 0x00000000;
style->BorderStyle = 1;
style->Alignment = 2;
style->Outline = 2;
style->MarginL = 10;
style->MarginR = 10;
style->MarginV = 5;
style->ScaleX = 1.;
style->ScaleY = 1.;
}
process_force_style(track);
return track;
}
static int check_duplicate_plaintext_event(ass_track_t* track)
{
int i;
ass_event_t* 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_event_t for the given track
* \param ass_track_t 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.
**/
int ass_process_subtitle(ass_track_t* track, subtitle* sub)
{
int eid;
ass_event_t* 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_t* ass_read_subdata(ass_library_t* library, sub_data* subdata, double fps) {
ass_track_t* track;
int i;
track = 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_t* ass_read_stream(ass_library_t* library, char *fname, char *charset) {
int i;
char *buf = NULL;
ass_track_t *track;
size_t sz = 0;
size_t buf_alloc = 0;
stream_t *fd;
fd = open_stream(fname, NULL, &i);
if (!fd) {
mp_msg(MSGT_ASS, MSGL_WARN, MSGTR_LIBASS_FopenFailed, fname);
return NULL;
}
if (fd->end_pos > STREAM_BUFFER_SIZE)
/* read entire file if size is known */
buf_alloc = fd->end_pos;
for (;;) {
if (buf_alloc >= 100*1024*1024) {
mp_msg(MSGT_ASS, MSGL_INFO, MSGTR_LIBASS_RefusingToLoadSubtitlesLargerThan100M, fname);
sz = 0;
break;
}
if (buf_alloc < sz + STREAM_BUFFER_SIZE)
buf_alloc += STREAM_BUFFER_SIZE;
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 ass_configure(ass_renderer_t* priv, int w, int h, int 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 ass_configure_fonts(ass_renderer_t* 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;
#if defined(LIBASS_VERSION) && LIBASS_VERSION >= 0x00907010
ass_set_fonts(priv, path, family, font_fontconfig, NULL, 1);
#else
if (font_fontconfig >= 0)
ass_set_fonts(priv, path, family);
else
ass_set_fonts_nofc(priv, path, family);
#endif
free(dir);
free(path);
free(family);
}
ass_library_t* ass_init(void) {
ass_library_t* priv;
char* path = get_path("fonts");
priv = ass_library_init();
ass_set_fonts_dir(priv, path);
ass_set_extract_fonts(priv, extract_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_t* ass_mp_render_frame(ass_renderer_t *priv, ass_track_t* 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);
}