mpv/sub/osd_libass.c

368 lines
11 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 "config.h"
#include "talloc.h"
#include "mp_msg.h"
#include "sub.h"
#include "libavutil/common.h"
static const char osd_font_pfb[] =
#include "sub/osd_font.h"
;
#include "sub/ass_mp.h"
#include "mp_core.h"
// Map OSD symbols (e.g. OSD_PLAY) to the glyphs in osd_font_pfb[].
#define OSD_CODEPOINTS 0xE000
// 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);
ass_set_aspect_ratio(osd->osd_render, 1.0, 1.0);
}
void osd_destroy_backend(struct osd_state *osd)
{
if (osd) {
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 eosd_draw_alpha_a8i8(unsigned char *src,
int src_w, int src_h,
int src_stride,
unsigned char *dst_a,
unsigned char *dst_i,
size_t dst_stride,
int dst_x, int dst_y,
uint32_t color)
{
const unsigned int r = (color >> 24) & 0xff;
const unsigned int g = (color >> 16) & 0xff;
const unsigned int b = (color >> 8) & 0xff;
const unsigned int a = 0xff - (color & 0xff);
int gray = (r + g + b) / 3; // not correct
dst_a += dst_y * dst_stride + dst_x;
dst_i += dst_y * dst_stride + dst_x;
int src_skip = src_stride - src_w;
int dst_skip = dst_stride - src_w;
for (int y = 0; y < src_h; y++) {
for (int x = 0; x < src_w; x++) {
unsigned char as = (*src * a) >> 8;
unsigned char bs = (gray * as) >> 8;
// to mplayer scale
as = -as;
unsigned char *a = dst_a;
unsigned char *b = dst_i;
// NOTE: many special cases, because alpha=0 means transparency,
// while alpha=1..255 is opaque..transparent
if (as) {
*b = ((*b * as) >> 8) + bs;
if (*a) {
*a = (*a * as) >> 8;
if (*a < 1)
*a = 1;
} else {
*a = as;
}
}
dst_a++;
dst_i++;
src++;
}
dst_a += dst_skip;
dst_i += dst_skip;
src += src_skip;
}
}
static void eosd_render_a8i8(unsigned char *a, unsigned char *i, size_t stride,
int x, int y, ASS_Image *imgs)
{
for (ASS_Image *p = imgs; p; p = p->next) {
eosd_draw_alpha_a8i8(p->bitmap, p->w, p->h, p->stride, a, i, stride,
x + p->dst_x, y + p->dst_y, p->color);
}
}
static bool ass_bb(ASS_Image *imgs, int *x1, int *y1, int *x2, int *y2)
{
*x1 = *y1 = INT_MAX;
*x2 = *y2 = INT_MIN;
for (ASS_Image *p = imgs; p; p = p->next) {
*x1 = FFMIN(*x1, p->dst_x);
*y1 = FFMIN(*y1, p->dst_y);
*x2 = FFMAX(*x2, p->dst_x + p->w);
*y2 = FFMAX(*y2, p->dst_y + p->h);
}
return *x1 < *x2 && *y1 < *y2;
}
static void draw_ass_osd(struct osd_state *osd, mp_osd_obj_t *obj)
{
ass_set_frame_size(osd->osd_render, osd->w, osd->h);
ASS_Image *imgs = ass_render_frame(osd->osd_render, obj->osd_track, 0,
NULL);
int x1, y1, x2, y2;
if (!ass_bb(imgs, &x1, &y1, &x2, &y2)) {
obj->flags &= ~OSDFLAG_VISIBLE;
return;
}
obj->bbox.x1 = x1;
obj->bbox.y1 = y1;
obj->bbox.x2 = x2;
obj->bbox.y2 = y2;
obj->flags |= OSDFLAG_BBOX;
osd_alloc_buf(obj);
eosd_render_a8i8(obj->alpha_buffer, obj->bitmap_buffer, obj->stride,
-x1, -y1, imgs);
}
static void update_font_scale(ASS_Track *track, ASS_Style *style, double factor)
{
// duplicated from ass_mp.c
double fs = track->PlayResY * 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;
style->FontSize = fs;
style->Outline = style->FontSize / 16;
}
static ASS_Track *create_osd_ass_track(struct osd_state *osd)
{
ASS_Track *track = mp_ass_default_track(osd->osd_ass_library, osd->opts);
ASS_Style *style = track->styles + track->default_style;
track->PlayResX = track->PlayResY * 1.33333;
update_font_scale(track, style, text_font_scale_factor);
style->Alignment = 5;
free(style->FontName);
style->FontName = strdup(font_name ? font_name : "Sans");
return track;
}
static ASS_Event *get_osd_ass_event(ASS_Track *track)
{
ass_flush_events(track);
ass_alloc_event(track);
ASS_Event *event = track->events + 0;
event->Start = 0;
event->Duration = 100;
event->Style = track->default_style;
return event;
}
static char *append_utf8_buffer(char *buffer, uint32_t codepoint)
{
char data[8];
uint8_t tmp;
char *output = data;
PUT_UTF8(codepoint, tmp, *output++ = tmp;);
return talloc_strndup_append_buffer(buffer, data, output - data);
}
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) {
if (in[0] == '\\' && strchr("nNh{}", in[1])) {
// Undo escaping, e.g. \{ -> \\{
// Note that e.g. \\j still must be emitted as \\j
// (libass only understands the escapes listed in the strchr args)
res = talloc_asprintf_append_buffer(res, "\\\\%c", in[1]);
in += 2;
continue;
}
// As used by osd_get_function_sym().
if (in[0] == '\xFF') {
res = talloc_strdup_append_buffer(res, ASS_USE_OSD_FONT);
res = 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);
in++;
}
return res;
}
void vo_update_text_osd(struct osd_state *osd, mp_osd_obj_t* obj)
{
if (!obj->osd_track)
obj->osd_track = create_osd_ass_track(osd);
ASS_Event *event = get_osd_ass_event(obj->osd_track);
event->Text = mangle_ass(osd->osd_text);
draw_ass_osd(osd, obj);
talloc_free(event->Text);
event->Text = NULL;
}
#define OSDBAR_ELEMS 46
void vo_update_text_progbar(struct osd_state *osd, mp_osd_obj_t* obj)
{
obj->flags |= OSDFLAG_CHANGED | OSDFLAG_VISIBLE;
if (vo_osd_progbar_type < 0) {
obj->flags &= ~OSDFLAG_VISIBLE;
return;
}
if (!obj->osd_track)
obj->osd_track = create_osd_ass_track(osd);
ASS_Style *style = obj->osd_track->styles + obj->osd_track->default_style;
style->Alignment = 10;
style->MarginL = style->MarginR = style->MarginV = 0;
// We need a fixed font size with respect to the OSD width.
// Assume the OSD bar takes 2/3 of the OSD width at PlayResY=288 and
// FontSize=22 with an OSD aspect ratio of 16:9. Rescale as needed.
// xxx can fail when unknown fonts are involved
double asp = (double)osd->w / osd->h;
double scale = (asp / 1.77777) * (obj->osd_track->PlayResY / 288.0);
style->ScaleX = style->ScaleY = scale;
style->FontSize = 22.0;
style->Outline = style->FontSize / 16 * scale;
int active = (vo_osd_progbar_value * OSDBAR_ELEMS + 255) / 256;
active = FFMIN(OSDBAR_ELEMS, FFMAX(active, 0));
char *text = talloc_strdup(NULL, "{\\q2}");
if (vo_osd_progbar_type >= 32) {
text = append_utf8_buffer(text, vo_osd_progbar_type);
} else if (vo_osd_progbar_type > 0) {
text = talloc_strdup_append_buffer(text, ASS_USE_OSD_FONT);
text = append_utf8_buffer(text, OSD_CODEPOINTS + vo_osd_progbar_type);
text = talloc_strdup_append_buffer(text, "{\\r}");
}
//xxx space in normal font, because OSD font doesn't have a space
text = talloc_strdup_append_buffer(text, "\\h");
text = talloc_strdup_append_buffer(text, ASS_USE_OSD_FONT);
text = append_utf8_buffer(text, OSD_CODEPOINTS + OSD_PB_START);
for (int n = 0; n < active; n++)
text = append_utf8_buffer(text, OSD_CODEPOINTS + OSD_PB_0);
for (int n = 0; n < OSDBAR_ELEMS - active; n++)
text = append_utf8_buffer(text, OSD_CODEPOINTS + OSD_PB_1);
text = append_utf8_buffer(text, OSD_CODEPOINTS + OSD_PB_END);
ASS_Event *event = get_osd_ass_event(obj->osd_track);
event->Text = text;
draw_ass_osd(osd, obj);
event->Text = NULL;
talloc_free(text);
}
void vo_update_text_sub(struct osd_state *osd, mp_osd_obj_t* obj)
{
struct MPOpts *opts = osd->opts;
obj->flags |= OSDFLAG_CHANGED | OSDFLAG_VISIBLE;
if (!vo_sub || !opts->sub_visibility) {
obj->flags &= ~OSDFLAG_VISIBLE;
return;
}
if (!obj->osd_track)
obj->osd_track = mp_ass_default_track(osd->osd_ass_library, osd->opts);
ASS_Style *style = obj->osd_track->styles + obj->osd_track->default_style;
style->MarginV = obj->osd_track->PlayResY * ((100 - sub_pos)/110.0);
update_font_scale(obj->osd_track, style, text_font_scale_factor);
char *text = talloc_strdup(NULL, "");
for (int n = 0; n < vo_sub->lines; n++)
text = talloc_asprintf_append_buffer(text, "%s\n", vo_sub->text[n]);
ASS_Event *event = get_osd_ass_event(obj->osd_track);
event->Text = mangle_ass(text);
draw_ass_osd(osd, obj);
talloc_free(event->Text);
event->Text = NULL;
talloc_free(text);
}
// unneeded
void osd_font_invalidate(void) {}
void osd_font_load(struct osd_state *osd) {}