206 lines
6.8 KiB
C
206 lines
6.8 KiB
C
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/*
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* Copyright (c) 2012 Clément Bœsch
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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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/**
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* @file
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* JACOsub subtitle decoder
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* @see http://unicorn.us.com/jacosub/jscripts.html
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*/
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#include <time.h>
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#include "ass.h"
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#include "jacosub.h"
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#include "libavutil/avstring.h"
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#include "libavutil/bprint.h"
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#include "libavutil/time_internal.h"
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#undef time
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static int insert_text(AVBPrint *dst, const char *in, const char *arg)
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{
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av_bprintf(dst, "%s", arg);
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return 0;
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}
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static int insert_datetime(AVBPrint *dst, const char *in, const char *arg)
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{
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char buf[16] = {0};
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time_t now = time(0);
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struct tm ltime;
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localtime_r(&now, <ime);
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if (strftime(buf, sizeof(buf), arg, <ime))
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av_bprintf(dst, "%s", buf);
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return 0;
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}
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static int insert_color(AVBPrint *dst, const char *in, const char *arg)
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{
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return 1; // skip id
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}
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static int insert_font(AVBPrint *dst, const char *in, const char *arg)
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{
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return 1; // skip id
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}
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static const struct {
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const char *from;
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const char *arg;
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int (*func)(AVBPrint *dst, const char *in, const char *arg);
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} ass_codes_map[] = {
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{"\\~", "~", insert_text}, // tilde doesn't need escaping
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{"~", "{\\h}", insert_text}, // hard space
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{"\\n", "\\N", insert_text}, // newline
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{"\\D", "%d %b %Y", insert_datetime}, // current date
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{"\\T", "%H:%M", insert_datetime}, // current time
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{"\\N", "{\\r}", insert_text}, // reset to default style
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{"\\I", "{\\i1}", insert_text}, // italic on
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{"\\i", "{\\i0}", insert_text}, // italic off
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{"\\B", "{\\b1}", insert_text}, // bold on
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{"\\b", "{\\b0}", insert_text}, // bold off
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{"\\U", "{\\u1}", insert_text}, // underline on
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{"\\u", "{\\u0}", insert_text}, // underline off
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{"\\C", "", insert_color}, // TODO: color
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{"\\F", "", insert_font}, // TODO: font
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};
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enum {
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ALIGN_VB = 1<<0, // vertical bottom, default
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ALIGN_VM = 1<<1, // vertical middle
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ALIGN_VT = 1<<2, // vertical top
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ALIGN_JC = 1<<3, // justify center, default
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ALIGN_JL = 1<<4, // justify left
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ALIGN_JR = 1<<5, // justify right
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};
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static void jacosub_to_ass(AVCodecContext *avctx, AVBPrint *dst, const char *src)
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{
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int i, valign = 0, halign = 0;
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char c = av_toupper(*src);
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char directives[128] = {0};
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/* extract the optional directives */
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if ((c >= 'A' && c <= 'Z') || c == '[') {
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char *p = directives;
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char *pend = directives + sizeof(directives) - 1;
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do *p++ = av_toupper(*src++);
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while (*src && !jss_whitespace(*src) && p < pend);
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*p = 0;
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src = jss_skip_whitespace(src);
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}
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/* handle directives (TODO: handle more of them, and more reliably) */
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if (strstr(directives, "VB")) valign = ALIGN_VB;
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else if (strstr(directives, "VM")) valign = ALIGN_VM;
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else if (strstr(directives, "VT")) valign = ALIGN_VT;
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if (strstr(directives, "JC")) halign = ALIGN_JC;
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else if (strstr(directives, "JL")) halign = ALIGN_JL;
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else if (strstr(directives, "JR")) halign = ALIGN_JR;
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if (valign || halign) {
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if (!valign) valign = ALIGN_VB;
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if (!halign) halign = ALIGN_JC;
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switch (valign | halign) {
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case ALIGN_VB | ALIGN_JL: av_bprintf(dst, "{\\an1}"); break; // bottom left
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case ALIGN_VB | ALIGN_JC: av_bprintf(dst, "{\\an2}"); break; // bottom center
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case ALIGN_VB | ALIGN_JR: av_bprintf(dst, "{\\an3}"); break; // bottom right
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case ALIGN_VM | ALIGN_JL: av_bprintf(dst, "{\\an4}"); break; // middle left
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case ALIGN_VM | ALIGN_JC: av_bprintf(dst, "{\\an5}"); break; // middle center
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case ALIGN_VM | ALIGN_JR: av_bprintf(dst, "{\\an6}"); break; // middle right
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case ALIGN_VT | ALIGN_JL: av_bprintf(dst, "{\\an7}"); break; // top left
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case ALIGN_VT | ALIGN_JC: av_bprintf(dst, "{\\an8}"); break; // top center
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case ALIGN_VT | ALIGN_JR: av_bprintf(dst, "{\\an9}"); break; // top right
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}
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}
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/* process timed line */
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while (*src && *src != '\n') {
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/* text continue on the next line */
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if (src[0] == '\\' && src[1] == '\n') {
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src += 2;
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while (jss_whitespace(*src))
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src++;
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continue;
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}
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/* special character codes */
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for (i = 0; i < FF_ARRAY_ELEMS(ass_codes_map); i++) {
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const char *from = ass_codes_map[i].from;
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const char *arg = ass_codes_map[i].arg;
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size_t codemap_len = strlen(from);
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if (!strncmp(src, from, codemap_len)) {
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src += codemap_len;
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src += ass_codes_map[i].func(dst, src, arg);
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break;
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}
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}
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/* simple char copy */
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if (i == FF_ARRAY_ELEMS(ass_codes_map))
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av_bprintf(dst, "%c", *src++);
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}
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}
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static int jacosub_decode_frame(AVCodecContext *avctx,
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void *data, int *got_sub_ptr, AVPacket *avpkt)
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{
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int ret;
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AVSubtitle *sub = data;
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const char *ptr = avpkt->data;
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FFASSDecoderContext *s = avctx->priv_data;
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if (avpkt->size <= 0)
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goto end;
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if (*ptr) {
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AVBPrint buffer;
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// skip timers
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ptr = jss_skip_whitespace(ptr);
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ptr = strchr(ptr, ' '); if (!ptr) goto end; ptr++;
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ptr = strchr(ptr, ' '); if (!ptr) goto end; ptr++;
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av_bprint_init(&buffer, JSS_MAX_LINESIZE, JSS_MAX_LINESIZE);
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jacosub_to_ass(avctx, &buffer, ptr);
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ret = ff_ass_add_rect(sub, buffer.str, s->readorder++, 0, NULL, NULL);
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av_bprint_finalize(&buffer, NULL);
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if (ret < 0)
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return ret;
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}
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end:
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*got_sub_ptr = sub->num_rects > 0;
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return avpkt->size;
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}
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AVCodec ff_jacosub_decoder = {
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.name = "jacosub",
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.long_name = NULL_IF_CONFIG_SMALL("JACOsub subtitle"),
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.type = AVMEDIA_TYPE_SUBTITLE,
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.id = AV_CODEC_ID_JACOSUB,
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.init = ff_ass_subtitle_header_default,
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.decode = jacosub_decode_frame,
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.flush = ff_ass_decoder_flush,
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.priv_data_size = sizeof(FFASSDecoderContext),
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};
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