185 lines
7.2 KiB
C
185 lines
7.2 KiB
C
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/*
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* SSA/ASS common functions
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* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "ass.h"
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#include "libavutil/avassert.h"
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#include "libavutil/avstring.h"
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#include "libavutil/bprint.h"
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#include "libavutil/common.h"
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int ff_ass_subtitle_header_full(AVCodecContext *avctx,
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int play_res_x, int play_res_y,
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const char *font, int font_size,
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int primary_color, int secondary_color,
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int outline_color, int back_color,
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int bold, int italic, int underline,
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int border_style, int alignment)
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{
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avctx->subtitle_header = av_asprintf(
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"[Script Info]\r\n"
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"; Script generated by FFmpeg/Lavc%s\r\n"
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"ScriptType: v4.00+\r\n"
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"PlayResX: %d\r\n"
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"PlayResY: %d\r\n"
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"ScaledBorderAndShadow: yes\r\n"
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"\r\n"
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"[V4+ Styles]\r\n"
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/* ASSv4 header */
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"Format: Name, "
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"Fontname, Fontsize, "
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"PrimaryColour, SecondaryColour, OutlineColour, BackColour, "
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"Bold, Italic, Underline, StrikeOut, "
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"ScaleX, ScaleY, "
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"Spacing, Angle, "
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"BorderStyle, Outline, Shadow, "
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"Alignment, MarginL, MarginR, MarginV, "
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"Encoding\r\n"
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"Style: "
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"Default," /* Name */
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"%s,%d," /* Font{name,size} */
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"&H%x,&H%x,&H%x,&H%x," /* {Primary,Secondary,Outline,Back}Colour */
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"%d,%d,%d,0," /* Bold, Italic, Underline, StrikeOut */
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"100,100," /* Scale{X,Y} */
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"0,0," /* Spacing, Angle */
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"%d,1,0," /* BorderStyle, Outline, Shadow */
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"%d,10,10,10," /* Alignment, Margin[LRV] */
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"0\r\n" /* Encoding */
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"\r\n"
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"[Events]\r\n"
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"Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text\r\n",
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!(avctx->flags & AV_CODEC_FLAG_BITEXACT) ? AV_STRINGIFY(LIBAVCODEC_VERSION) : "",
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play_res_x, play_res_y, font, font_size,
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primary_color, secondary_color, outline_color, back_color,
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-bold, -italic, -underline, border_style, alignment);
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if (!avctx->subtitle_header)
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return AVERROR(ENOMEM);
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avctx->subtitle_header_size = strlen(avctx->subtitle_header);
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return 0;
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}
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int ff_ass_subtitle_header(AVCodecContext *avctx,
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const char *font, int font_size,
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int color, int back_color,
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int bold, int italic, int underline,
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int border_style, int alignment)
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{
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return ff_ass_subtitle_header_full(avctx,
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ASS_DEFAULT_PLAYRESX, ASS_DEFAULT_PLAYRESY,
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font, font_size, color, color,
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back_color, back_color,
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bold, italic, underline,
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border_style, alignment);
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}
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int ff_ass_subtitle_header_default(AVCodecContext *avctx)
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{
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return ff_ass_subtitle_header(avctx, ASS_DEFAULT_FONT,
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ASS_DEFAULT_FONT_SIZE,
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ASS_DEFAULT_COLOR,
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ASS_DEFAULT_BACK_COLOR,
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ASS_DEFAULT_BOLD,
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ASS_DEFAULT_ITALIC,
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ASS_DEFAULT_UNDERLINE,
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ASS_DEFAULT_BORDERSTYLE,
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ASS_DEFAULT_ALIGNMENT);
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}
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char *ff_ass_get_dialog(int readorder, int layer, const char *style,
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const char *speaker, const char *text)
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{
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return av_asprintf("%d,%d,%s,%s,0,0,0,,%s",
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readorder, layer, style ? style : "Default",
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speaker ? speaker : "", text);
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}
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int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
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int readorder, int layer, const char *style,
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const char *speaker)
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{
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char *ass_str;
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AVSubtitleRect **rects;
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rects = av_realloc_array(sub->rects, sub->num_rects+1, sizeof(*sub->rects));
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if (!rects)
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return AVERROR(ENOMEM);
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sub->rects = rects;
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rects[sub->num_rects] = av_mallocz(sizeof(*rects[0]));
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if (!rects[sub->num_rects])
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return AVERROR(ENOMEM);
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rects[sub->num_rects]->type = SUBTITLE_ASS;
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ass_str = ff_ass_get_dialog(readorder, layer, style, speaker, dialog);
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if (!ass_str)
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return AVERROR(ENOMEM);
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rects[sub->num_rects]->ass = ass_str;
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sub->num_rects++;
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return 0;
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}
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void ff_ass_decoder_flush(AVCodecContext *avctx)
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{
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FFASSDecoderContext *s = avctx->priv_data;
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if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
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s->readorder = 0;
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}
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void ff_ass_bprint_text_event(AVBPrint *buf, const char *p, int size,
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const char *linebreaks, int keep_ass_markup)
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{
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const char *p_end = p + size;
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for (; p < p_end && *p; p++) {
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/* forced custom line breaks, not accounted as "normal" EOL */
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if (linebreaks && strchr(linebreaks, *p)) {
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av_bprintf(buf, "\\N");
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/* standard ASS escaping so random characters don't get mis-interpreted
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* as ASS */
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} else if (!keep_ass_markup && strchr("{}\\", *p)) {
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av_bprintf(buf, "\\%c", *p);
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/* some packets might end abruptly (no \0 at the end, like for example
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* in some cases of demuxing from a classic video container), some
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* might be terminated with \n or \r\n which we have to remove (for
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* consistency with those who haven't), and we also have to deal with
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* evil cases such as \r at the end of the buffer (and no \0 terminated
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* character) */
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} else if (p[0] == '\n') {
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/* some stuff left so we can insert a line break */
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if (p < p_end - 1)
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av_bprintf(buf, "\\N");
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} else if (p[0] == '\r' && p < p_end - 1 && p[1] == '\n') {
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/* \r followed by a \n, we can skip it. We don't insert the \N yet
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* because we don't know if it is followed by more text */
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continue;
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/* finally, a sane character */
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} else {
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av_bprint_chars(buf, *p, 1);
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}
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}
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}
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