| /* | |
| * 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 | |
| * MicroDVD subtitle decoder | |
| * | |
| * Based on the specifications found here: | |
| * https://trac.videolan.org/vlc/ticket/1825#comment:6 | |
| */ | |
| #include "libavutil/avstring.h" | |
| #include "libavutil/parseutils.h" | |
| #include "libavutil/bprint.h" | |
| #include "avcodec.h" | |
| #include "ass.h" | |
| #include "codec_internal.h" | |
| static int indexof(const char *s, int c) | |
| { | |
| char *f = strchr(s, c); | |
| return f ? (f - s) : -1; | |
| } | |
| struct microdvd_tag { | |
| char key; | |
| int persistent; | |
| uint32_t data1; | |
| uint32_t data2; | |
| char *data_string; | |
| int data_string_len; | |
| }; | |
| #define MICRODVD_PERSISTENT_OFF 0 | |
| #define MICRODVD_PERSISTENT_ON 1 | |
| #define MICRODVD_PERSISTENT_OPENED 2 | |
| // Color, Font, Size, cHarset, stYle, Position, cOordinate | |
| #define MICRODVD_TAGS "cfshyYpo" | |
| static void microdvd_set_tag(struct microdvd_tag *tags, struct microdvd_tag tag) | |
| { | |
| int tag_index = indexof(MICRODVD_TAGS, tag.key); | |
| if (tag_index < 0) | |
| return; | |
| memcpy(&tags[tag_index], &tag, sizeof(tag)); | |
| } | |
| // italic, bold, underline, strike-through | |
| #define MICRODVD_STYLES "ibus" | |
| /* some samples have lines that start with a / indicating non persistent italic | |
| * marker */ | |
| static char *check_for_italic_slash_marker(struct microdvd_tag *tags, char *s) | |
| { | |
| if (*s == '/') { | |
| struct microdvd_tag tag = tags[indexof(MICRODVD_TAGS, 'y')]; | |
| tag.key = 'y'; | |
| tag.data1 |= 1 << 0 /* 'i' position in MICRODVD_STYLES */; | |
| microdvd_set_tag(tags, tag); | |
| s++; | |
| } | |
| return s; | |
| } | |
| static char *microdvd_load_tags(struct microdvd_tag *tags, char *s) | |
| { | |
| s = check_for_italic_slash_marker(tags, s); | |
| while (*s == '{') { | |
| char *start = s; | |
| char tag_char = *(s + 1); | |
| struct microdvd_tag tag = {0}; | |
| if (!tag_char || *(s + 2) != ':') | |
| break; | |
| s += 3; | |
| switch (tag_char) { | |
| /* Style */ | |
| case 'Y': | |
| tag.persistent = MICRODVD_PERSISTENT_ON; | |
| case 'y': | |
| while (*s && *s != '}' && s - start < 256) { | |
| int style_index = indexof(MICRODVD_STYLES, *s); | |
| if (style_index >= 0) | |
| tag.data1 |= (1 << style_index); | |
| s++; | |
| } | |
| if (*s != '}') | |
| break; | |
| /* We must distinguish persistent and non-persistent styles | |
| * to handle this kind of style tags: {y:ib}{Y:us} */ | |
| tag.key = tag_char; | |
| break; | |
| /* Color */ | |
| case 'C': | |
| tag.persistent = MICRODVD_PERSISTENT_ON; | |
| case 'c': | |
| while (*s == '$' || *s == '#') | |
| s++; | |
| tag.data1 = strtol(s, &s, 16) & 0x00ffffff; | |
| if (*s != '}') | |
| break; | |
| tag.key = 'c'; | |
| break; | |
| /* Font name */ | |
| case 'F': | |
| tag.persistent = MICRODVD_PERSISTENT_ON; | |
| case 'f': { | |
| int len = indexof(s, '}'); | |
| if (len < 0) | |
| break; | |
| tag.data_string = s; | |
| tag.data_string_len = len; | |
| s += len; | |
| tag.key = 'f'; | |
| break; | |
| } | |
| /* Font size */ | |
| case 'S': | |
| tag.persistent = MICRODVD_PERSISTENT_ON; | |
| case 's': | |
| tag.data1 = strtol(s, &s, 10); | |
| if (*s != '}') | |
| break; | |
| tag.key = 's'; | |
| break; | |
| /* Charset */ | |
| case 'H': { | |
| //TODO: not yet handled, just parsed. | |
| int len = indexof(s, '}'); | |
| if (len < 0) | |
| break; | |
| tag.data_string = s; | |
| tag.data_string_len = len; | |
| s += len; | |
| tag.key = 'h'; | |
| break; | |
| } | |
| /* Position */ | |
| case 'P': | |
| if (!*s) | |
| break; | |
| tag.persistent = MICRODVD_PERSISTENT_ON; | |
| tag.data1 = (*s++ == '1'); | |
| if (*s != '}') | |
| break; | |
| tag.key = 'p'; | |
| break; | |
| /* Coordinates */ | |
| case 'o': | |
| tag.persistent = MICRODVD_PERSISTENT_ON; | |
| tag.data1 = strtol(s, &s, 10); | |
| if (*s != ',') | |
| break; | |
| s++; | |
| tag.data2 = strtol(s, &s, 10); | |
| if (*s != '}') | |
| break; | |
| tag.key = 'o'; | |
| break; | |
| default: /* Unknown tag, we consider it's text */ | |
| break; | |
| } | |
| if (tag.key == 0) | |
| return start; | |
| microdvd_set_tag(tags, tag); | |
| s++; | |
| } | |
| return check_for_italic_slash_marker(tags, s); | |
| } | |
| static void microdvd_open_tags(AVBPrint *new_line, struct microdvd_tag *tags) | |
| { | |
| int i, sidx; | |
| for (i = 0; i < sizeof(MICRODVD_TAGS) - 1; i++) { | |
| if (tags[i].persistent == MICRODVD_PERSISTENT_OPENED) | |
| continue; | |
| switch (tags[i].key) { | |
| case 'Y': | |
| case 'y': | |
| for (sidx = 0; sidx < sizeof(MICRODVD_STYLES) - 1; sidx++) | |
| if (tags[i].data1 & (1 << sidx)) | |
| av_bprintf(new_line, "{\\%c1}", MICRODVD_STYLES[sidx]); | |
| break; | |
| case 'c': | |
| av_bprintf(new_line, "{\\c&H%06"PRIX32"&}", tags[i].data1); | |
| break; | |
| case 'f': | |
| av_bprintf(new_line, "{\\fn%.*s}", | |
| tags[i].data_string_len, tags[i].data_string); | |
| break; | |
| case 's': | |
| av_bprintf(new_line, "{\\fs%"PRId32"}", tags[i].data1); | |
| break; | |
| case 'p': | |
| if (tags[i].data1 == 0) | |
| av_bprintf(new_line, "{\\an8}"); | |
| break; | |
| case 'o': | |
| av_bprintf(new_line, "{\\pos(%"PRId32",%"PRId32")}", | |
| tags[i].data1, tags[i].data2); | |
| break; | |
| } | |
| if (tags[i].persistent == MICRODVD_PERSISTENT_ON) | |
| tags[i].persistent = MICRODVD_PERSISTENT_OPENED; | |
| } | |
| } | |
| static void microdvd_close_no_persistent_tags(AVBPrint *new_line, | |
| struct microdvd_tag *tags) | |
| { | |
| int i, sidx; | |
| for (i = sizeof(MICRODVD_TAGS) - 2; i >= 0; i--) { | |
| if (tags[i].persistent != MICRODVD_PERSISTENT_OFF) | |
| continue; | |
| switch (tags[i].key) { | |
| case 'y': | |
| for (sidx = sizeof(MICRODVD_STYLES) - 2; sidx >= 0; sidx--) | |
| if (tags[i].data1 & (1 << sidx)) | |
| av_bprintf(new_line, "{\\%c0}", MICRODVD_STYLES[sidx]); | |
| break; | |
| case 'c': | |
| av_bprintf(new_line, "{\\c}"); | |
| break; | |
| case 'f': | |
| av_bprintf(new_line, "{\\fn}"); | |
| break; | |
| case 's': | |
| av_bprintf(new_line, "{\\fs}"); | |
| break; | |
| } | |
| tags[i].key = 0; | |
| } | |
| } | |
| static int microdvd_decode_frame(AVCodecContext *avctx, AVSubtitle *sub, | |
| int *got_sub_ptr, const AVPacket *avpkt) | |
| { | |
| AVBPrint new_line; | |
| char *line = avpkt->data; | |
| char *end = avpkt->data + avpkt->size; | |
| FFASSDecoderContext *s = avctx->priv_data; | |
| struct microdvd_tag tags[sizeof(MICRODVD_TAGS) - 1] = {{0}}; | |
| if (avpkt->size <= 0) | |
| return avpkt->size; | |
| av_bprint_init(&new_line, 0, 2048); | |
| // subtitle content | |
| while (line < end && *line) { | |
| // parse MicroDVD tags, and open them in ASS | |
| line = microdvd_load_tags(tags, line); | |
| microdvd_open_tags(&new_line, tags); | |
| // simple copy until EOL or forced carriage return | |
| while (line < end && *line && *line != '|') { | |
| av_bprint_chars(&new_line, *line, 1); | |
| line++; | |
| } | |
| // line split | |
| if (line < end && *line == '|') { | |
| microdvd_close_no_persistent_tags(&new_line, tags); | |
| av_bprintf(&new_line, "\\N"); | |
| line++; | |
| } | |
| } | |
| if (new_line.len) { | |
| int ret = ff_ass_add_rect(sub, new_line.str, s->readorder++, 0, NULL, NULL); | |
| av_bprint_finalize(&new_line, NULL); | |
| if (ret < 0) | |
| return ret; | |
| } | |
| *got_sub_ptr = sub->num_rects > 0; | |
| return avpkt->size; | |
| } | |
| static int microdvd_init(AVCodecContext *avctx) | |
| { | |
| int i, sidx; | |
| AVBPrint font_buf; | |
| int font_size = ASS_DEFAULT_FONT_SIZE; | |
| int color = ASS_DEFAULT_COLOR; | |
| int bold = ASS_DEFAULT_BOLD; | |
| int italic = ASS_DEFAULT_ITALIC; | |
| int underline = ASS_DEFAULT_UNDERLINE; | |
| int alignment = ASS_DEFAULT_ALIGNMENT; | |
| struct microdvd_tag tags[sizeof(MICRODVD_TAGS) - 1] = {{0}}; | |
| av_bprint_init(&font_buf, 0, AV_BPRINT_SIZE_AUTOMATIC); | |
| av_bprintf(&font_buf, "%s", ASS_DEFAULT_FONT); | |
| if (avctx->extradata) { | |
| microdvd_load_tags(tags, avctx->extradata); | |
| for (i = 0; i < sizeof(MICRODVD_TAGS) - 1; i++) { | |
| switch (av_tolower(tags[i].key)) { | |
| case 'y': | |
| for (sidx = 0; sidx < sizeof(MICRODVD_STYLES) - 1; sidx++) { | |
| if (tags[i].data1 & (1 << sidx)) { | |
| switch (MICRODVD_STYLES[sidx]) { | |
| case 'i': italic = 1; break; | |
| case 'b': bold = 1; break; | |
| case 'u': underline = 1; break; | |
| } | |
| } | |
| } | |
| break; | |
| case 'c': color = tags[i].data1; break; | |
| case 's': font_size = tags[i].data1; break; | |
| case 'p': alignment = 8; break; | |
| case 'f': | |
| av_bprint_clear(&font_buf); | |
| av_bprintf(&font_buf, "%.*s", | |
| tags[i].data_string_len, tags[i].data_string); | |
| break; | |
| } | |
| } | |
| } | |
| return ff_ass_subtitle_header(avctx, font_buf.str, font_size, color, | |
| ASS_DEFAULT_BACK_COLOR, bold, italic, | |
| underline, ASS_DEFAULT_BORDERSTYLE, | |
| alignment); | |
| } | |
| const FFCodec ff_microdvd_decoder = { | |
| .p.name = "microdvd", | |
| CODEC_LONG_NAME("MicroDVD subtitle"), | |
| .p.type = AVMEDIA_TYPE_SUBTITLE, | |
| .p.id = AV_CODEC_ID_MICRODVD, | |
| .init = microdvd_init, | |
| FF_CODEC_DECODE_SUB_CB(microdvd_decode_frame), | |
| .flush = ff_ass_decoder_flush, | |
| .priv_data_size = sizeof(FFASSDecoderContext), | |
| }; |