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/*
* 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 border_style, 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 */
"%d,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, 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_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_rect(AVSubtitle *sub, const char *dialog,
int readorder, int layer, const char *style,
const char *speaker)
{
char *ass_str;
AVSubtitleRect **rects;
rects = av_realloc_array(sub->rects, (sub->num_rects+1), sizeof(*sub->rects));
if (!rects)
return AVERROR(ENOMEM);
sub->rects = rects;
rects[sub->num_rects] = av_mallocz(sizeof(*rects[0]));
if (!rects[sub->num_rects])
return AVERROR(ENOMEM);
rects[sub->num_rects]->type = SUBTITLE_ASS;
ass_str = ff_ass_get_dialog(readorder, layer, style, speaker, dialog);
if (!ass_str)
return AVERROR(ENOMEM);
rects[sub->num_rects]->ass = ass_str;
sub->num_rects++;
return 0;
}
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");
/* 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);
}
}
}
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