/* * 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/avassert.h" #include "libavutil/avstring.h" #include "libavutil/bprint.h" #include "libavutil/common.h" 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 alignment) { avctx->subtitle_header = av_asprintf( "[Script Info]\r\n" "; Script generated by FFmpeg/Lavc%s\r\n" "ScriptType: v4.00+\r\n" "PlayResX: %d\r\n" "PlayResY: %d\r\n" "\r\n" "[V4+ Styles]\r\n" /* ASSv4 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\r\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 */ "1,1,0," /* BorderStyle, Outline, Shadow */ "%d,10,10,10," /* Alignment, Margin[LRV] */ "0\r\n" /* Encoding */ "\r\n" "[Events]\r\n" "Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\r\n", !(avctx->flags & AV_CODEC_FLAG_BITEXACT) ? AV_STRINGIFY(LIBAVCODEC_VERSION) : "", ASS_DEFAULT_PLAYRESX, ASS_DEFAULT_PLAYRESY, font, font_size, color, color, back_color, back_color, -bold, -italic, -underline, alignment); if (!avctx->subtitle_header) return AVERROR(ENOMEM); avctx->subtitle_header_size = strlen(avctx->subtitle_header); return 0; } 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_ALIGNMENT); } static void insert_ts(AVBPrint *buf, int ts) { if (ts == -1) { av_bprintf(buf, "9:59:59.99,"); } else { int h, m, s; h = ts/360000; ts -= 360000*h; m = ts/ 6000; ts -= 6000*m; s = ts/ 100; ts -= 100*s; av_bprintf(buf, "%d:%02d:%02d.%02d,", h, m, s, ts); } } int ff_ass_bprint_dialog(AVBPrint *buf, const char *dialog, int ts_start, int duration, int raw) { int dlen; if (!raw || raw == 2) { long int layer = 0; if (raw == 2) { /* skip ReadOrder */ dialog = strchr(dialog, ','); if (!dialog) return AVERROR_INVALIDDATA; dialog++; /* extract Layer or Marked */ layer = strtol(dialog, (char**)&dialog, 10); if (*dialog != ',') return AVERROR_INVALIDDATA; dialog++; } av_bprintf(buf, "Dialogue: %ld,", layer); insert_ts(buf, ts_start); insert_ts(buf, duration == -1 ? -1 : ts_start + duration); if (raw != 2) av_bprintf(buf, "Default,,0,0,0,,"); } dlen = strcspn(dialog, "\n"); dlen += dialog[dlen] == '\n'; av_bprintf(buf, "%.*s", dlen, dialog); if (raw == 2) av_bprintf(buf, "\r\n"); return dlen; } int ff_ass_add_rect(AVSubtitle *sub, const char *dialog, int ts_start, int duration, int raw) { AVBPrint buf; int ret, dlen; AVSubtitleRect **rects; av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); if ((ret = ff_ass_bprint_dialog(&buf, dialog, ts_start, duration, raw)) < 0) goto err; dlen = ret; if (!av_bprint_is_complete(&buf)) goto errnomem; rects = av_realloc_array(sub->rects, (sub->num_rects+1), sizeof(*sub->rects)); if (!rects) goto errnomem; sub->rects = rects; sub->end_display_time = FFMAX(sub->end_display_time, 10 * duration); rects[sub->num_rects] = av_mallocz(sizeof(*rects[0])); rects[sub->num_rects]->type = SUBTITLE_ASS; ret = av_bprint_finalize(&buf, &rects[sub->num_rects]->ass); if (ret < 0) goto err; sub->num_rects++; return dlen; errnomem: ret = AVERROR(ENOMEM); err: av_bprint_finalize(&buf, NULL); return ret; } int ff_ass_add_rect_bprint(AVSubtitle *sub, AVBPrint *buf, int ts_start, int duration) { av_bprintf(buf, "\r\n"); if (!av_bprint_is_complete(buf)) return AVERROR(ENOMEM); return ff_ass_add_rect(sub, buf->str, ts_start, duration, 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"); /* standard ASS escaping so random characters don't get mis-interpreted * as ASS */ } else if (!keep_ass_markup && strchr("{}\\", *p)) { av_bprintf(buf, "\\%c", *p); /* 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); } } }