| /* |
| * SSA/ASS common functions |
| * Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org> |
| * |
| * 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 |
| */ |
| |
| #include "avcodec.h" |
| #include "ass.h" |
| #include "libavutil/avstring.h" |
| #include "libavutil/bprint.h" |
| #include "libavutil/mem.h" |
| #include "version.h" |
| |
| int ff_ass_subtitle_header_full(AVCodecContext *avctx, |
| int play_res_x, int play_res_y, |
| const char *font, int font_size, |
| int primary_color, int secondary_color, |
| int outline_color, int back_color, |
| int bold, int italic, int underline, |
| int border_style, int alignment) |
| { |
| avctx->subtitle_header = av_asprintf( |
| "[Script Info]\n" |
| "; Script generated by FFmpeg/Lavc%s\n" |
| "ScriptType: v4.00+\n" |
| "PlayResX: %d\n" |
| "PlayResY: %d\n" |
| "ScaledBorderAndShadow: yes\n" |
| "YCbCr Matrix: None\n" |
| "\n" |
| "[V4+ Styles]\n" |
| |
| /* ASS (v4+) header */ |
| "Format: Name, " |
| "Fontname, Fontsize, " |
| "PrimaryColour, SecondaryColour, OutlineColour, BackColour, " |
| "Bold, Italic, Underline, StrikeOut, " |
| "ScaleX, ScaleY, " |
| "Spacing, Angle, " |
| "BorderStyle, Outline, Shadow, " |
| "Alignment, MarginL, MarginR, MarginV, " |
| "Encoding\n" |
| |
| "Style: " |
| "Default," /* Name */ |
| "%s,%d," /* Font{name,size} */ |
| "&H%x,&H%x,&H%x,&H%x," /* {Primary,Secondary,Outline,Back}Colour */ |
| "%d,%d,%d,0," /* Bold, Italic, Underline, StrikeOut */ |
| "100,100," /* Scale{X,Y} */ |
| "0,0," /* Spacing, Angle */ |
| "%d,1,0," /* BorderStyle, Outline, Shadow */ |
| "%d,10,10,10," /* Alignment, Margin[LRV] */ |
| "1\n" /* Encoding */ |
| |
| "\n" |
| "[Events]\n" |
| "Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\n", |
| !(avctx->flags & AV_CODEC_FLAG_BITEXACT) ? AV_STRINGIFY(LIBAVCODEC_VERSION) : "", |
| play_res_x, play_res_y, font, font_size, |
| primary_color, secondary_color, outline_color, back_color, |
| -bold, -italic, -underline, border_style, alignment); |
| |
| if (!avctx->subtitle_header) |
| return AVERROR(ENOMEM); |
| avctx->subtitle_header_size = strlen(avctx->subtitle_header); |
| return 0; |
| } |
| |
| int ff_ass_subtitle_header(AVCodecContext *avctx, |
| const char *font, int font_size, |
| int color, int back_color, |
| int bold, int italic, int underline, |
| int border_style, int alignment) |
| { |
| return ff_ass_subtitle_header_full(avctx, |
| ASS_DEFAULT_PLAYRESX, ASS_DEFAULT_PLAYRESY, |
| font, font_size, color, color, |
| back_color, back_color, |
| bold, italic, underline, |
| border_style, alignment); |
| } |
| |
| int ff_ass_subtitle_header_default(AVCodecContext *avctx) |
| { |
| return ff_ass_subtitle_header(avctx, ASS_DEFAULT_FONT, |
| ASS_DEFAULT_FONT_SIZE, |
| ASS_DEFAULT_COLOR, |
| ASS_DEFAULT_BACK_COLOR, |
| ASS_DEFAULT_BOLD, |
| ASS_DEFAULT_ITALIC, |
| ASS_DEFAULT_UNDERLINE, |
| ASS_DEFAULT_BORDERSTYLE, |
| ASS_DEFAULT_ALIGNMENT); |
| } |
| |
| char *ff_ass_get_dialog(int readorder, int layer, const char *style, |
| const char *speaker, const char *text) |
| { |
| return av_asprintf("%d,%d,%s,%s,0,0,0,,%s", |
| readorder, layer, style ? style : "Default", |
| speaker ? speaker : "", text); |
| } |
| |
| int ff_ass_add_rect2(AVSubtitle *sub, const char *dialog, |
| int readorder, int layer, const char *style, |
| const char *speaker, unsigned *nb_rect_allocated) |
| { |
| AVSubtitleRect **rects = sub->rects, *rect; |
| char *ass_str; |
| uint64_t new_nb = 0; |
| |
| if (sub->num_rects >= UINT_MAX) |
| return AVERROR(ENOMEM); |
| |
| if (nb_rect_allocated && *nb_rect_allocated <= sub->num_rects) { |
| if (sub->num_rects < UINT_MAX / 17 * 16) { |
| new_nb = sub->num_rects + sub->num_rects/16 + 1; |
| } else |
| new_nb = UINT_MAX; |
| } else if (!nb_rect_allocated) |
| new_nb = sub->num_rects + 1; |
| |
| if (new_nb) { |
| rects = av_realloc_array(rects, new_nb, sizeof(*sub->rects)); |
| if (!rects) |
| return AVERROR(ENOMEM); |
| if (nb_rect_allocated) |
| *nb_rect_allocated = new_nb; |
| sub->rects = rects; |
| } |
| |
| rect = av_mallocz(sizeof(*rect)); |
| if (!rect) |
| return AVERROR(ENOMEM); |
| rects[sub->num_rects++] = rect; |
| rect->type = SUBTITLE_ASS; |
| ass_str = ff_ass_get_dialog(readorder, layer, style, speaker, dialog); |
| if (!ass_str) |
| return AVERROR(ENOMEM); |
| rect->ass = ass_str; |
| return 0; |
| } |
| |
| int ff_ass_add_rect(AVSubtitle *sub, const char *dialog, |
| int readorder, int layer, const char *style, |
| const char *speaker) |
| { |
| return ff_ass_add_rect2(sub, dialog, readorder, layer, style, speaker, NULL); |
| } |
| |
| void ff_ass_decoder_flush(AVCodecContext *avctx) |
| { |
| FFASSDecoderContext *s = avctx->priv_data; |
| if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP)) |
| s->readorder = 0; |
| } |
| |
| void ff_ass_bprint_text_event(AVBPrint *buf, const char *p, int size, |
| const char *linebreaks, int keep_ass_markup) |
| { |
| const char *p_end = p + size; |
| |
| for (; p < p_end && *p; p++) { |
| |
| /* forced custom line breaks, not accounted as "normal" EOL */ |
| if (linebreaks && strchr(linebreaks, *p)) { |
| av_bprintf(buf, "\\N"); |
| |
| /* cancel curly brackets to avoid bogus override tag blocks |
| * hiding text. Standard ASS has no character escapes, |
| * though (only) libass provides \{ and \}. |
| * Unpaired closing brackets don't need escaping at all though and |
| * to make the situation less bad in standard ASS insert an empty block |
| */ |
| } else if (!keep_ass_markup && *p == '{') { |
| av_bprintf(buf, "\\{{}"); |
| |
| /* append word-joiner U+2060 as UTF-8 to break up sequences like \N */ |
| } else if (!keep_ass_markup && *p == '\\') { |
| if (p_end - p <= 3 || strncmp(p + 1, "\xe2\x81\xa0", 3)) |
| av_bprintf(buf, "\\\xe2\x81\xa0"); |
| else |
| av_bprintf(buf, "\\"); |
| |
| /* some packets might end abruptly (no \0 at the end, like for example |
| * in some cases of demuxing from a classic video container), some |
| * might be terminated with \n or \r\n which we have to remove (for |
| * consistency with those who haven't), and we also have to deal with |
| * evil cases such as \r at the end of the buffer (and no \0 terminated |
| * character) */ |
| } else if (p[0] == '\n') { |
| /* some stuff left so we can insert a line break */ |
| if (p < p_end - 1) |
| av_bprintf(buf, "\\N"); |
| } else if (p[0] == '\r' && p < p_end - 1 && p[1] == '\n') { |
| /* \r followed by a \n, we can skip it. We don't insert the \N yet |
| * because we don't know if it is followed by more text */ |
| continue; |
| |
| /* finally, a sane character */ |
| } else { |
| av_bprint_chars(buf, *p, 1); |
| } |
| } |
| } |
