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mpv/sub/osd_libass.c

409 lines
12 KiB
C

/*
* This file is part of mplayer2.
*
* mplayer2 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.
*
* mplayer2 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 mplayer2. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <libavutil/common.h>
#include "config.h"
#include "talloc.h"
#include "core/mp_common.h"
#include "core/mp_msg.h"
#include "sub.h"
static const char osd_font_pfb[] =
#include "sub/osd_font.h"
;
#include "sub/ass_mp.h"
#include "core/mp_core.h"
// NOTE: \fs-5 to reduce the size of the symbols in relation to normal text.
// Done because libass doesn't center characters that are too high.
#define ASS_USE_OSD_FONT "{\\fnOSD\\fs-5}"
void osd_init_backend(struct osd_state *osd)
{
osd->osd_ass_library = mp_ass_init(osd->opts);
ass_add_font(osd->osd_ass_library, "OSD", (void *)osd_font_pfb,
sizeof(osd_font_pfb) - 1);
osd->osd_render = ass_renderer_init(osd->osd_ass_library);
mp_ass_configure_fonts(osd->osd_render, osd->opts->osd_style);
ass_set_aspect_ratio(osd->osd_render, 1.0, 1.0);
}
void osd_destroy_backend(struct osd_state *osd)
{
for (int n = 0; n < MAX_OSD_PARTS; n++) {
struct osd_object *obj = osd->objs[n];
if (obj->osd_track)
ass_free_track(obj->osd_track);
obj->osd_track = NULL;
}
if (osd->osd_render)
ass_renderer_done(osd->osd_render);
osd->osd_render = NULL;
ass_library_done(osd->osd_ass_library);
osd->osd_ass_library = NULL;
}
static void create_osd_ass_track(struct osd_state *osd, struct osd_object *obj)
{
ASS_Track *track = obj->osd_track;
if (!track)
track = ass_new_track(osd->osd_ass_library);
double aspect = 1.0 * obj->vo_res.w / FFMAX(obj->vo_res.h, 1) /
obj->vo_res.display_par;
track->track_type = TRACK_TYPE_ASS;
track->Timer = 100.;
track->PlayResY = MP_ASS_FONT_PLAYRESY;
track->PlayResX = track->PlayResY * aspect;
track->WrapStyle = 1; // end-of-line wrapping instead of smart wrapping
if (track->n_styles == 0) {
track->Kerning = true;
int sid = ass_alloc_style(track);
track->default_style = sid;
ASS_Style *style = track->styles + sid;
style->Alignment = 5; // top-title, left
style->Name = strdup("OSD");
mp_ass_set_style(style, MP_ASS_FONT_PLAYRESY, osd->opts->osd_style);
// Set to neutral base direction, as opposed to VSFilter LTR default
style->Encoding = -1;
}
obj->osd_track = track;
}
static ASS_Event *add_osd_ass_event(ASS_Track *track, const char *text)
{
int n = ass_alloc_event(track);
ASS_Event *event = track->events + n;
event->Start = 0;
event->Duration = 100;
event->Style = track->default_style;
assert(event->Text == NULL);
if (text)
event->Text = strdup(text);
return event;
}
static void clear_obj(struct osd_object *obj)
{
if (obj->osd_track)
ass_flush_events(obj->osd_track);
}
void osd_get_function_sym(char *buffer, size_t buffer_size, int osd_function)
{
// 0xFF is never valid UTF-8, so we can use it to escape OSD symbols.
snprintf(buffer, buffer_size, "\xFF%c", osd_function);
}
static char *mangle_ass(const char *in)
{
char *res = talloc_strdup(NULL, "");
while (*in) {
// As used by osd_get_function_sym().
if (in[0] == '\xFF' && in[1]) {
res = talloc_strdup_append_buffer(res, ASS_USE_OSD_FONT);
res = mp_append_utf8_buffer(res, OSD_CODEPOINTS + in[1]);
res = talloc_strdup_append_buffer(res, "{\\r}");
in += 2;
continue;
}
if (*in == '{')
res = talloc_strdup_append_buffer(res, "\\");
res = talloc_strndup_append_buffer(res, in, 1);
// Break ASS escapes with U+2060 WORD JOINER
if (*in == '\\')
res = mp_append_utf8_buffer(res, 0x2060);
in++;
}
return res;
}
static void update_osd(struct osd_state *osd, struct osd_object *obj)
{
struct MPOpts *opts = osd->opts;
create_osd_ass_track(osd, obj);
clear_obj(obj);
if (!osd->osd_text[0])
return;
struct osd_style_opts font = *opts->osd_style;
font.font_size *= opts->osd_scale;
ASS_Style *style = obj->osd_track->styles + obj->osd_track->default_style;
mp_ass_set_style(style, obj->osd_track->PlayResY, &font);
char *text = mangle_ass(osd->osd_text);
add_osd_ass_event(obj->osd_track, text);
talloc_free(text);
}
// align: -1 .. +1
// frame: size of the containing area
// obj: size of the object that should be positioned inside the area
// margin: min. distance from object to frame (as long as -1 <= align <= +1)
static float get_align(float align, float frame, float obj, float margin)
{
frame -= margin * 2;
return margin + frame / 2 - obj / 2 + (frame - obj) / 2 * align;
}
struct ass_draw {
int scale;
char *text;
};
static void ass_draw_start(struct ass_draw *d)
{
d->scale = FFMAX(d->scale, 1);
d->text = talloc_asprintf_append(d->text, "{\\p%d}", d->scale);
}
static void ass_draw_stop(struct ass_draw *d)
{
d->text = talloc_strdup_append(d->text, "{\\p0}");
}
static void ass_draw_c(struct ass_draw *d, float x, float y)
{
int ix = round(x * (1 << (d->scale - 1)));
int iy = round(y * (1 << (d->scale - 1)));
d->text = talloc_asprintf_append(d->text, " %d %d", ix, iy);
}
static void ass_draw_append(struct ass_draw *d, const char *t)
{
d->text = talloc_strdup_append(d->text, t);
}
static void ass_draw_move_to(struct ass_draw *d, float x, float y)
{
ass_draw_append(d, " m");
ass_draw_c(d, x, y);
}
static void ass_draw_line_to(struct ass_draw *d, float x, float y)
{
ass_draw_append(d, " l");
ass_draw_c(d, x, y);
}
static void ass_draw_rect_ccw(struct ass_draw *d, float x0, float y0,
float x1, float y1)
{
ass_draw_move_to(d, x0, y0);
ass_draw_line_to(d, x0, y1);
ass_draw_line_to(d, x1, y1);
ass_draw_line_to(d, x1, y0);
}
static void ass_draw_rect_cw(struct ass_draw *d, float x0, float y0,
float x1, float y1)
{
ass_draw_move_to(d, x0, y0);
ass_draw_line_to(d, x1, y0);
ass_draw_line_to(d, x1, y1);
ass_draw_line_to(d, x0, y1);
}
static void ass_draw_reset(struct ass_draw *d)
{
talloc_free(d->text);
d->text = NULL;
}
static void get_osd_bar_box(struct osd_state *osd, struct osd_object *obj,
float *o_x, float *o_y, float *o_w, float *o_h,
float *o_border)
{
struct MPOpts *opts = osd->opts;
bool new_track = !obj->osd_track;
create_osd_ass_track(osd, obj);
ASS_Track *track = obj->osd_track;
ASS_Style *style = track->styles + track->default_style;
*o_w = track->PlayResX * (opts->osd_bar_w / 100.0);
*o_h = track->PlayResY * (opts->osd_bar_h / 100.0);
if (new_track) {
float base_size = 0.03125;
style->Outline *= *o_h / track->PlayResY / base_size;
// So that the chapter marks have space between them
style->Outline = FFMIN(style->Outline, *o_h / 5.2);
// So that the border is not 0
style->Outline = FFMAX(style->Outline, *o_h / 32.0);
// Rendering with shadow is broken (because there's more than one shape)
style->Shadow = 0;
}
*o_border = style->Outline;
*o_x = get_align(opts->osd_bar_align_x, track->PlayResX, *o_w, *o_border);
*o_y = get_align(opts->osd_bar_align_y, track->PlayResY, *o_h, *o_border);
}
static void update_progbar(struct osd_state *osd, struct osd_object *obj)
{
float px, py, width, height, border;
get_osd_bar_box(osd, obj, &px, &py, &width, &height, &border);
clear_obj(obj);
if (osd->progbar_type < 0)
return;
float sx = px - border * 2 - height / 4; // includes additional spacing
float sy = py + height / 2;
char *text = talloc_asprintf(NULL, "{\\an6\\pos(%f,%f)}", sx, sy);
if (osd->progbar_type == 0 || osd->progbar_type >= 256) {
// no sym
} else if (osd->progbar_type >= 32) {
text = mp_append_utf8_buffer(text, osd->progbar_type);
} else {
text = talloc_strdup_append_buffer(text, ASS_USE_OSD_FONT);
text = mp_append_utf8_buffer(text, OSD_CODEPOINTS + osd->progbar_type);
text = talloc_strdup_append_buffer(text, "{\\r}");
}
add_osd_ass_event(obj->osd_track, text);
talloc_free(text);
struct ass_draw *d = &(struct ass_draw) { .scale = 4 };
// filled area
d->text = talloc_asprintf_append(d->text, "{\\bord0\\pos(%f,%f)}", px, py);
ass_draw_start(d);
float pos = osd->progbar_value * width - border / 2;
ass_draw_rect_cw(d, 0, 0, pos, height);
ass_draw_stop(d);
add_osd_ass_event(obj->osd_track, d->text);
ass_draw_reset(d);
// position marker
d->text = talloc_asprintf_append(d->text, "{\\bord%f\\pos(%f,%f)}",
border / 2, px, py);
ass_draw_start(d);
ass_draw_move_to(d, pos + border / 2, 0);
ass_draw_line_to(d, pos + border / 2, height);
ass_draw_stop(d);
add_osd_ass_event(obj->osd_track, d->text);
ass_draw_reset(d);
d->text = talloc_asprintf_append(d->text, "{\\pos(%f,%f)}", px, py);
ass_draw_start(d);
// the box
ass_draw_rect_cw(d, -border, -border, width + border, height + border);
// the "hole"
ass_draw_rect_ccw(d, 0, 0, width, height);
// chapter marks
for (int n = 0; n < osd->progbar_num_stops; n++) {
float s = osd->progbar_stops[n] * width;
float dent = border * 1.3;
if (s > dent && s < width - dent) {
ass_draw_move_to(d, s + dent, 0);
ass_draw_line_to(d, s, dent);
ass_draw_line_to(d, s - dent, 0);
ass_draw_move_to(d, s - dent, height);
ass_draw_line_to(d, s, height - dent);
ass_draw_line_to(d, s + dent, height);
}
}
ass_draw_stop(d);
add_osd_ass_event(obj->osd_track, d->text);
ass_draw_reset(d);
}
static void update_sub(struct osd_state *osd, struct osd_object *obj)
{
struct MPOpts *opts = osd->opts;
clear_obj(obj);
if (!osd->sub_text || !osd->sub_text[0])
return;
if (!obj->osd_track)
obj->osd_track = mp_ass_default_track(osd->osd_ass_library, osd->opts);
struct osd_style_opts font = *opts->sub_text_style;
font.font_size *= opts->sub_scale;
ASS_Style *style = obj->osd_track->styles + obj->osd_track->default_style;
mp_ass_set_style(style, obj->osd_track->PlayResY, &font);
#if LIBASS_VERSION >= 0x01010000
ass_set_line_position(osd->osd_render, 100 - opts->sub_pos);
#endif
char *escaped_text = mangle_ass(osd->sub_text);
add_osd_ass_event(obj->osd_track, escaped_text);
talloc_free(escaped_text);
}
static void update_object(struct osd_state *osd, struct osd_object *obj)
{
switch (obj->type) {
case OSDTYPE_OSD:
update_osd(osd, obj);
break;
case OSDTYPE_SUBTEXT:
update_sub(osd, obj);
break;
case OSDTYPE_PROGBAR:
update_progbar(osd, obj);
break;
}
}
void osd_object_get_bitmaps(struct osd_state *osd, struct osd_object *obj,
struct sub_bitmaps *out_imgs)
{
if (obj->force_redraw)
update_object(osd, obj);
*out_imgs = (struct sub_bitmaps) {0};
if (!obj->osd_track)
return;
ass_set_frame_size(osd->osd_render, obj->vo_res.w, obj->vo_res.h);
ass_set_aspect_ratio(osd->osd_render, obj->vo_res.display_par, 1.0);
mp_ass_render_frame(osd->osd_render, obj->osd_track, 0,
&obj->parts_cache, out_imgs);
talloc_steal(obj, obj->parts_cache);
}