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mpv/sub/osd_libass.c

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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. 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 "mpv_talloc.h"
#include "misc/bstr.h"
#include "common/common.h"
#include "common/msg.h"
#include "osd.h"
#include "osd_state.h"
static const char osd_font_pfb[] =
#include "sub/osd_font.h"
;
#include "sub/ass_mp.h"
#include "options/options.h"
#define ASS_USE_OSD_FONT "{\\fnmpv-osd-symbols}"
void osd_init_backend(struct osd_state *osd)
{
}
static void create_ass_renderer(struct osd_state *osd, struct ass_state *ass)
{
if (ass->render)
return;
ass->log = mp_log_new(NULL, osd->log, "libass");
ass->library = mp_ass_init(osd->global, ass->log);
ass_add_font(ass->library, "mpv-osd-symbols", (void *)osd_font_pfb,
sizeof(osd_font_pfb) - 1);
ass->render = ass_renderer_init(ass->library);
if (!ass->render)
abort();
mp_ass_configure_fonts(ass->render, osd->opts->osd_style,
osd->global, ass->log);
ass_set_aspect_ratio(ass->render, 1.0, 1.0);
}
static void destroy_ass_renderer(struct ass_state *ass)
{
if (ass->track)
ass_free_track(ass->track);
ass->track = NULL;
if (ass->render)
ass_renderer_done(ass->render);
ass->render = NULL;
if (ass->library)
ass_library_done(ass->library);
ass->library = NULL;
talloc_free(ass->log);
ass->log = NULL;
}
static void destroy_external(struct osd_external *ext)
{
talloc_free(ext->text);
destroy_ass_renderer(&ext->ass);
}
void osd_destroy_backend(struct osd_state *osd)
{
for (int n = 0; n < MAX_OSD_PARTS; n++) {
struct osd_object *obj = osd->objs[n];
destroy_ass_renderer(&obj->ass);
for (int i = 0; i < obj->num_externals; i++)
destroy_external(&obj->externals[i]);
obj->num_externals = 0;
}
}
static void create_ass_track(struct osd_state *osd, struct osd_object *obj,
struct ass_state *ass, int res_x, int res_y)
{
create_ass_renderer(osd, ass);
ASS_Track *track = ass->track;
if (!track)
track = ass_new_track(ass->library);
int old_res_x = track->PlayResX;
int old_res_y = track->PlayResY;
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 = res_y ? res_y : MP_ASS_FONT_PLAYRESY;
track->PlayResX = res_x ? res_x : track->PlayResY * aspect;
track->WrapStyle = 1; // end-of-line wrapping instead of smart wrapping
track->Kerning = true;
// Force libass to clear its internal cache - it doesn't check for
// PlayRes changes itself.
if (old_res_x != track->PlayResX || old_res_y != track->PlayResY)
ass_set_frame_size(ass->render, 1, 1);
ass->track = track;
}
static int find_style(ASS_Track *track, const char *name, int def)
{
for (int n = 0; n < track->n_styles; n++) {
if (track->styles[n].Name && strcmp(track->styles[n].Name, name) == 0)
return n;
}
return def;
}
// Find a given style, or add it if it's missing.
static ASS_Style *get_style(struct ass_state *ass, char *name)
{
ASS_Track *track = ass->track;
if (!track)
return NULL;
int sid = find_style(track, name, -1);
if (sid >= 0)
return &track->styles[sid];
sid = ass_alloc_style(track);
ASS_Style *style = &track->styles[sid];
style->Name = strdup(name);
// Set to neutral base direction, as opposed to VSFilter LTR default
style->Encoding = -1;
return style;
}
static ASS_Event *add_osd_ass_event(ASS_Track *track, const char *style,
const char *text)
{
int n = ass_alloc_event(track);
ASS_Event *event = track->events + n;
event->Start = 0;
event->Duration = 100;
event->Style = find_style(track, style, 0);
event->ReadOrder = n;
assert(event->Text == NULL);
if (text)
event->Text = strdup(text);
return event;
}
static void clear_ass(struct ass_state *ass)
{
if (ass->track)
ass_flush_events(ass->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.
// (Same trick as OSD_ASS_0/OSD_ASS_1.)
snprintf(buffer, buffer_size, "\xFF%c", osd_function);
}
static void mangle_ass(bstr *dst, const char *in)
{
bool escape_ass = true;
while (*in) {
// As used by osd_get_function_sym().
if (in[0] == '\xFF' && in[1]) {
bstr_xappend(NULL, dst, bstr0(ASS_USE_OSD_FONT));
mp_append_utf8_bstr(NULL, dst, OSD_CODEPOINTS + in[1]);
bstr_xappend(NULL, dst, bstr0("{\\r}"));
in += 2;
continue;
}
if (*in == OSD_ASS_0[0] || *in == OSD_ASS_1[0]) {
escape_ass = *in == OSD_ASS_1[0];
in += 1;
continue;
}
if (escape_ass && *in == '{')
bstr_xappend(NULL, dst, bstr0("\\"));
bstr_xappend(NULL, dst, (bstr){(char *)in, 1});
// Break ASS escapes with U+2060 WORD JOINER
if (escape_ass && *in == '\\')
mp_append_utf8_bstr(NULL, dst, 0x2060);
in++;
}
}
static ASS_Event *add_osd_ass_event_escaped(ASS_Track *track, const char *style,
const char *text)
{
bstr buf = {0};
mangle_ass(&buf, text);
ASS_Event *e = add_osd_ass_event(track, style, buf.start);
talloc_free(buf.start);
return e;
}
static void update_osd_text(struct osd_state *osd, struct osd_object *obj)
{
struct MPOpts *opts = osd->opts;
if (!obj->text[0])
return;
create_ass_track(osd, obj, &obj->ass, 0, 0);
struct osd_style_opts font = *opts->osd_style;
font.font_size *= opts->osd_scale;
double playresy = obj->ass.track->PlayResY;
// Compensate for libass and mp_ass_set_style scaling the font etc.
if (!opts->osd_scale_by_window)
playresy *= 720.0 / obj->vo_res.h;
mp_ass_set_style(get_style(&obj->ass, "OSD"), playresy, &font);
add_osd_ass_event_escaped(obj->ass.track, "OSD", obj->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;
create_ass_track(osd, obj, &obj->ass, 0, 0);
ASS_Track *track = obj->ass.track;
ASS_Style *style = get_style(&obj->ass, "progbar");
if (!style) {
*o_x = *o_y = *o_w = *o_h = *o_border = 0;
return;
}
mp_ass_set_style(style, track->PlayResY, opts->osd_style);
*o_w = track->PlayResX * (opts->osd_bar_w / 100.0);
*o_h = track->PlayResY * (opts->osd_bar_h / 100.0);
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;
style->Alignment = 5;
*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)
{
if (obj->progbar_state.type < 0)
return;
float px, py, width, height, border;
get_osd_bar_box(osd, obj, &px, &py, &width, &height, &border);
ASS_Track *track = obj->ass.track;
float sx = px - border * 2 - height / 4; // includes additional spacing
float sy = py + height / 2;
bstr buf = bstr0(talloc_asprintf(NULL, "{\\an6\\pos(%f,%f)}", sx, sy));
if (obj->progbar_state.type == 0 || obj->progbar_state.type >= 256) {
// no sym
} else if (obj->progbar_state.type >= 32) {
mp_append_utf8_bstr(NULL, &buf, obj->progbar_state.type);
} else {
bstr_xappend(NULL, &buf, bstr0(ASS_USE_OSD_FONT));
mp_append_utf8_bstr(NULL, &buf, OSD_CODEPOINTS + obj->progbar_state.type);
bstr_xappend(NULL, &buf, bstr0("{\\r}"));
}
add_osd_ass_event(track, "progbar", buf.start);
talloc_free(buf.start);
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 = obj->progbar_state.value * width - border / 2;
ass_draw_rect_cw(d, 0, 0, pos, height);
ass_draw_stop(d);
add_osd_ass_event(track, "progbar", 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(track, "progbar", 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 < obj->progbar_state.num_stops; n++) {
float s = obj->progbar_state.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(track, "progbar", d->text);
ass_draw_reset(d);
}
static void update_osd(struct osd_state *osd, struct osd_object *obj)
{
obj->osd_changed = false;
clear_ass(&obj->ass);
update_osd_text(osd, obj);
update_progbar(osd, obj);
}
static void update_external(struct osd_state *osd, struct osd_object *obj,
struct osd_external *ext)
{
bstr t = bstr0(ext->text);
if (!t.len)
return;
create_ass_track(osd, obj, &ext->ass, ext->res_x, ext->res_y);
clear_ass(&ext->ass);
int resy = ext->ass.track->PlayResY;
mp_ass_set_style(get_style(&ext->ass, "OSD"), resy, osd->opts->osd_style);
// Some scripts will reference this style name with \r tags.
const struct osd_style_opts *def = osd_style_conf.defaults;
mp_ass_set_style(get_style(&ext->ass, "Default"), resy, def);
while (t.len) {
bstr line;
bstr_split_tok(t, "\n", &line, &t);
if (line.len) {
char *tmp = bstrdup0(NULL, line);
add_osd_ass_event(ext->ass.track, "OSD", tmp);
talloc_free(tmp);
}
}
}
void osd_set_external(struct osd_state *osd, void *id, int res_x, int res_y,
char *text)
{
pthread_mutex_lock(&osd->lock);
struct osd_object *obj = osd->objs[OSDTYPE_EXTERNAL];
struct osd_external *entry = 0;
for (int n = 0; n < obj->num_externals; n++) {
if (obj->externals[n].id == id) {
entry = &obj->externals[n];
break;
}
}
if (!entry && !text)
goto done;
if (!entry) {
struct osd_external new = { .id = id };
MP_TARRAY_APPEND(obj, obj->externals, obj->num_externals, new);
entry = &obj->externals[obj->num_externals - 1];
}
if (!text) {
int index = entry - &obj->externals[0];
destroy_external(entry);
MP_TARRAY_REMOVE_AT(obj->externals, obj->num_externals, index);
goto done;
}
if (!entry->text || strcmp(entry->text, text) != 0 ||
entry->res_x != res_x || entry->res_y != res_y)
{
talloc_free(entry->text);
entry->text = talloc_strdup(NULL, text);
entry->res_x = res_x;
entry->res_y = res_y;
update_external(osd, obj, entry);
obj->changed = true;
osd->want_redraw_notification = true;
}
done:
pthread_mutex_unlock(&osd->lock);
}
static void append_ass(struct ass_state *ass, struct mp_osd_res *res,
ASS_Image **img_list, bool *changed)
{
if (!ass->render || !ass->track) {
*img_list = NULL;
return;
}
ass_set_frame_size(ass->render, res->w, res->h);
ass_set_aspect_ratio(ass->render, res->display_par, 1.0);
int ass_changed;
*img_list = ass_render_frame(ass->render, ass->track, 0, &ass_changed);
*changed |= ass_changed;
}
void osd_object_get_bitmaps(struct osd_state *osd, struct osd_object *obj,
int format, struct sub_bitmaps *out_imgs)
{
if (obj->type == OSDTYPE_OSD && obj->osd_changed)
update_osd(osd, obj);
if (!obj->ass_packer)
obj->ass_packer = mp_ass_packer_alloc(obj);
MP_TARRAY_GROW(obj, obj->ass_imgs, obj->num_externals + 1);
append_ass(&obj->ass, &obj->vo_res, &obj->ass_imgs[0], &obj->changed);
for (int n = 0; n < obj->num_externals; n++) {
append_ass(&obj->externals[n].ass, &obj->vo_res, &obj->ass_imgs[n + 1],
&obj->changed);
}
mp_ass_packer_pack(obj->ass_packer, obj->ass_imgs, obj->num_externals + 1,
obj->changed, format, out_imgs);
obj->changed = false;
}
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