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#include <assert.h>
#include <stdlib.h>
#include <SDL2/SDL_surface.h>
#include "kitchensink/kiterror.h"
#include "kitchensink/internal/utils/kitlog.h"
#include "kitchensink/internal/kitlibstate.h"
#include "kitchensink/internal/subtitle/kitsubtitlepacket.h"
#include "kitchensink/internal/subtitle/kitatlas.h"
#include "kitchensink/internal/utils/kithelpers.h"
#include "kitchensink/internal/subtitle/renderers/kitsubass.h"
typedef struct Kit_ASSSubtitleRenderer {
ASS_Renderer *renderer;
ASS_Track *track;
} Kit_ASSSubtitleRenderer;
static void Kit_ProcessAssImage(SDL_Surface *surface, const ASS_Image *img) {
unsigned char r = ((img->color) >> 24) & 0xFF;
unsigned char g = ((img->color) >> 16) & 0xFF;
unsigned char b = ((img->color) >> 8) & 0xFF;
unsigned char a = (img->color) & 0xFF;
unsigned char *src = img->bitmap;
unsigned char *dst = surface->pixels;
unsigned int x, y, rx;
for(y = 0; y < img->h; y++) {
for(x = 0; x < img->w; x++) {
rx = x * 4;
dst[rx + 0] = r;
dst[rx + 1] = g;
dst[rx + 2] = b;
dst[rx + 3] = ((255 - a) * src[x]) >> 8;
}
src += img->stride;
dst += surface->pitch;
}
}
static void ren_render_ass_cb(Kit_SubtitleRenderer *ren, void *src, double start_pts, double end_pts) {
assert(ren != NULL);
assert(src != NULL);
Kit_ASSSubtitleRenderer *ass_ren = ren->userdata;
AVSubtitle *sub = src;
// Read incoming subtitle packets to libASS
if(Kit_LockDecoderOutput(ren->dec) == 0) {
for(int r = 0; r < sub->num_rects; r++) {
if(sub->rects[r]->ass == NULL)
continue;
ass_process_data(ass_ren->track, sub->rects[r]->ass, strlen(sub->rects[r]->ass));
}
Kit_UnlockDecoderOutput(ren->dec);
}
}
static void ren_close_ass_cb(Kit_SubtitleRenderer *ren) {
if(ren == NULL) return;
Kit_ASSSubtitleRenderer *ass_ren = ren->userdata;
ass_free_track(ass_ren->track);
ass_renderer_done(ass_ren->renderer);
free(ass_ren);
}
static int ren_get_ass_data_cb(Kit_SubtitleRenderer *ren, Kit_TextureAtlas *atlas, double current_pts) {
Kit_ASSSubtitleRenderer *ass_ren = ren->userdata;
SDL_Surface *dst = NULL;
ASS_Image *src = NULL;
int change = 0;
unsigned int now = current_pts * 1000;
if(Kit_LockDecoderOutput(ren->dec) == 0) {
// Tell ASS to render some images
src = ass_render_frame(ass_ren->renderer, ass_ren->track, now, &change);
// If there was no change, stop here
if(change == 0) {
Kit_UnlockDecoderOutput(ren->dec);
return 0;
}
// There was some change, process images and add them to atlas
Kit_ClearAtlasContent(atlas);
for(; src; src = src->next) {
if(src->w == 0 || src->h == 0)
continue;
dst = SDL_CreateRGBSurfaceWithFormat(0, src->w, src->h, 32, SDL_PIXELFORMAT_RGBA32);
Kit_ProcessAssImage(dst, src);
SDL_Rect target;
target.x = src->dst_x;
target.y = src->dst_y;
target.w = dst->w;
target.h = dst->h;
Kit_AddAtlasItem(atlas, dst, &target);
SDL_FreeSurface(dst);
}
Kit_UnlockDecoderOutput(ren->dec);
}
ren->dec->clock_pos = current_pts;
return 0;
}
static void ren_set_ass_size_cb(Kit_SubtitleRenderer *ren, int w, int h) {
Kit_ASSSubtitleRenderer *ass_ren = ren->userdata;
ass_set_frame_size(ass_ren->renderer, w, h);
}
Kit_SubtitleRenderer* Kit_CreateASSSubtitleRenderer(Kit_Decoder *dec, int video_w, int video_h, int screen_w, int screen_h) {
assert(dec != NULL);
assert(video_w >= 0);
assert(video_h >= 0);
assert(screen_w >= 0);
assert(screen_h >= 0);
// Make sure that libass library has been initialized + get handle
Kit_LibraryState *state = Kit_GetLibraryState();
if(state->libass_handle == NULL) {
Kit_SetError("Libass library has not been initialized");
return NULL;
}
// First allocate the generic decoder component
Kit_SubtitleRenderer *ren = Kit_CreateSubtitleRenderer(dec);
if(ren == NULL) {
goto exit_0;
}
// Next, allocate ASS subtitle renderer context.
Kit_ASSSubtitleRenderer *ass_ren = calloc(1, sizeof(Kit_ASSSubtitleRenderer));
if(ass_ren == NULL) {
Kit_SetError("Unable to allocate ass subtitle renderer");
goto exit_1;
}
// Initialize libass renderer
ASS_Renderer *ass_renderer = ass_renderer_init(state->libass_handle);
if(ass_renderer == NULL) {
Kit_SetError("Unable to initialize libass renderer");
goto exit_2;
}
// Read fonts from attachment streams and give them to libass
for(int j = 0; j < dec->format_ctx->nb_streams; j++) {
AVStream *st = dec->format_ctx->streams[j];
if(st->codec->codec_type == AVMEDIA_TYPE_ATTACHMENT && attachment_is_font(st)) {
const AVDictionaryEntry *tag = av_dict_get(
st->metadata,
"filename",
NULL,
AV_DICT_MATCH_CASE);
if(tag) {
ass_add_font(
state->libass_handle,
tag->value,
(char*)st->codec->extradata,
st->codec->extradata_size);
}
}
}
// Init libass fonts and window frame size
ass_set_fonts(
ass_renderer,
NULL, "sans-serif",
ASS_FONTPROVIDER_AUTODETECT,
NULL, 1);
ass_set_storage_size(ass_renderer, video_w, video_h);
ass_set_frame_size(ass_renderer, screen_w, screen_h);
ass_set_hinting(ass_renderer, state->font_hinting);
// Initialize libass track
ASS_Track *ass_track = ass_new_track(state->libass_handle);
if(ass_track == NULL) {
Kit_SetError("Unable to initialize libass track");
goto exit_3;
}
// Set up libass track headers (ffmpeg provides these)
if(dec->codec_ctx->subtitle_header) {
ass_process_codec_private(
ass_track,
(char*)dec->codec_ctx->subtitle_header,
dec->codec_ctx->subtitle_header_size);
}
// Set callbacks and userdata, and we're go
ass_ren->renderer = ass_renderer;
ass_ren->track = ass_track;
ren->ren_render = ren_render_ass_cb;
ren->ren_close = ren_close_ass_cb;
ren->ren_get_data = ren_get_ass_data_cb;
ren->ren_set_size = ren_set_ass_size_cb;
ren->userdata = ass_ren;
return ren;
exit_3:
ass_renderer_done(ass_renderer);
exit_2:
free(ass_ren);
exit_1:
Kit_CloseSubtitleRenderer(ren);
exit_0:
return NULL;
}
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