/* * Copyright (c) 2012 Clément Bœsch * * This file is part of FFmpeg. * * FFmpeg 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. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * JACOsub subtitle decoder * @see http://unicorn.us.com/jacosub/jscripts.html */ #include #include "ass.h" #include "codec_internal.h" #include "jacosub.h" #include "libavutil/avstring.h" #include "libavutil/bprint.h" #include "libavutil/time_internal.h" #undef time static int insert_text(AVBPrint *dst, const char *in, const char *arg) { av_bprintf(dst, "%s", arg); return 0; } static int insert_datetime(AVBPrint *dst, const char *in, const char *arg) { char buf[16] = {0}; time_t now = time(0); struct tm ltime; localtime_r(&now, <ime); if (strftime(buf, sizeof(buf), arg, <ime)) av_bprintf(dst, "%s", buf); return 0; } static int insert_color(AVBPrint *dst, const char *in, const char *arg) { return 1; // skip id } static int insert_font(AVBPrint *dst, const char *in, const char *arg) { return 1; // skip id } static const struct { const char *from; const char *arg; int (*func)(AVBPrint *dst, const char *in, const char *arg); } ass_codes_map[] = { {"\\~", "~", insert_text}, // tilde doesn't need escaping {"~", "{\\h}", insert_text}, // hard space {"\\n", "\\N", insert_text}, // newline {"\\D", "%d %b %Y", insert_datetime}, // current date {"\\T", "%H:%M", insert_datetime}, // current time {"\\N", "{\\r}", insert_text}, // reset to default style {"\\I", "{\\i1}", insert_text}, // italic on {"\\i", "{\\i0}", insert_text}, // italic off {"\\B", "{\\b1}", insert_text}, // bold on {"\\b", "{\\b0}", insert_text}, // bold off {"\\U", "{\\u1}", insert_text}, // underline on {"\\u", "{\\u0}", insert_text}, // underline off {"\\C", "", insert_color}, // TODO: color {"\\F", "", insert_font}, // TODO: font }; enum { ALIGN_VB = 1<<0, // vertical bottom, default ALIGN_VM = 1<<1, // vertical middle ALIGN_VT = 1<<2, // vertical top ALIGN_JC = 1<<3, // justify center, default ALIGN_JL = 1<<4, // justify left ALIGN_JR = 1<<5, // justify right }; static void jacosub_to_ass(AVCodecContext *avctx, AVBPrint *dst, const char *src) { int i, valign = 0, halign = 0; char c = av_toupper(*src); char directives[128] = {0}; /* extract the optional directives */ if ((c >= 'A' && c <= 'Z') || c == '[') { char *p = directives; char *pend = directives + sizeof(directives) - 1; do *p++ = av_toupper(*src++); while (*src && !jss_whitespace(*src) && p < pend); *p = 0; src = jss_skip_whitespace(src); } /* handle directives (TODO: handle more of them, and more reliably) */ if (strstr(directives, "VB")) valign = ALIGN_VB; else if (strstr(directives, "VM")) valign = ALIGN_VM; else if (strstr(directives, "VT")) valign = ALIGN_VT; if (strstr(directives, "JC")) halign = ALIGN_JC; else if (strstr(directives, "JL")) halign = ALIGN_JL; else if (strstr(directives, "JR")) halign = ALIGN_JR; if (valign || halign) { if (!valign) valign = ALIGN_VB; if (!halign) halign = ALIGN_JC; switch (valign | halign) { case ALIGN_VB | ALIGN_JL: av_bprintf(dst, "{\\an1}"); break; // bottom left case ALIGN_VB | ALIGN_JC: av_bprintf(dst, "{\\an2}"); break; // bottom center case ALIGN_VB | ALIGN_JR: av_bprintf(dst, "{\\an3}"); break; // bottom right case ALIGN_VM | ALIGN_JL: av_bprintf(dst, "{\\an4}"); break; // middle left case ALIGN_VM | ALIGN_JC: av_bprintf(dst, "{\\an5}"); break; // middle center case ALIGN_VM | ALIGN_JR: av_bprintf(dst, "{\\an6}"); break; // middle right case ALIGN_VT | ALIGN_JL: av_bprintf(dst, "{\\an7}"); break; // top left case ALIGN_VT | ALIGN_JC: av_bprintf(dst, "{\\an8}"); break; // top center case ALIGN_VT | ALIGN_JR: av_bprintf(dst, "{\\an9}"); break; // top right } } /* process timed line */ while (*src && *src != '\n') { /* text continue on the next line */ if (src[0] == '\\' && src[1] == '\n') { src += 2; while (jss_whitespace(*src)) src++; continue; } /* special character codes */ for (i = 0; i < FF_ARRAY_ELEMS(ass_codes_map); i++) { const char *from = ass_codes_map[i].from; const char *arg = ass_codes_map[i].arg; size_t codemap_len = strlen(from); if (!strncmp(src, from, codemap_len)) { src += codemap_len; src += ass_codes_map[i].func(dst, src, arg); break; } } /* simple char copy */ if (i == FF_ARRAY_ELEMS(ass_codes_map)) av_bprintf(dst, "%c", *src++); } } static int jacosub_decode_frame(AVCodecContext *avctx, AVSubtitle *sub, int *got_sub_ptr, const AVPacket *avpkt) { int ret; const char *ptr = avpkt->data; FFASSDecoderContext *s = avctx->priv_data; if (avpkt->size <= 0) goto end; if (*ptr) { AVBPrint buffer; // skip timers ptr = jss_skip_whitespace(ptr); ptr = strchr(ptr, ' '); if (!ptr) goto end; ptr++; ptr = strchr(ptr, ' '); if (!ptr) goto end; ptr++; av_bprint_init(&buffer, JSS_MAX_LINESIZE, JSS_MAX_LINESIZE); jacosub_to_ass(avctx, &buffer, ptr); ret = ff_ass_add_rect(sub, buffer.str, s->readorder++, 0, NULL, NULL); av_bprint_finalize(&buffer, NULL); if (ret < 0) return ret; } end: *got_sub_ptr = sub->num_rects > 0; return avpkt->size; } const FFCodec ff_jacosub_decoder = { .p.name = "jacosub", CODEC_LONG_NAME("JACOsub subtitle"), .p.type = AVMEDIA_TYPE_SUBTITLE, .p.id = AV_CODEC_ID_JACOSUB, .init = ff_ass_subtitle_header_default, FF_CODEC_DECODE_SUB_CB(jacosub_decode_frame), .flush = ff_ass_decoder_flush, .priv_data_size = sizeof(FFASSDecoderContext), };