| /* |
| * 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 <time.h> |
| #include "ass.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, |
| void *data, int *got_sub_ptr, AVPacket *avpkt) |
| { |
| int ret; |
| AVSubtitle *sub = data; |
| 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; |
| } |
| |
| AVCodec ff_jacosub_decoder = { |
| .name = "jacosub", |
| .long_name = NULL_IF_CONFIG_SMALL("JACOsub subtitle"), |
| .type = AVMEDIA_TYPE_SUBTITLE, |
| .id = AV_CODEC_ID_JACOSUB, |
| .init = ff_ass_subtitle_header_default, |
| .decode = jacosub_decode_frame, |
| .flush = ff_ass_decoder_flush, |
| .priv_data_size = sizeof(FFASSDecoderContext), |
| }; |