/* * Copyright (c) 2012 Clément Bœsch * * 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 */ /** * @file * JACOsub subtitle demuxer * @see http://unicorn.us.com/jacosub/jscripts.html * @todo Support P[ALETTE] directive. */ #include "avformat.h" #include "internal.h" #include "subtitles.h" #include "libavcodec/jacosub.h" #include "libavutil/avstring.h" #include "libavutil/bprint.h" #include "libavutil/intreadwrite.h" typedef struct { FFDemuxSubtitlesQueue q; int shift; unsigned timeres; } JACOsubContext; static int timed_line(const char *ptr) { char c; int fs, fe; return (sscanf(ptr, "%*u:%*u:%*u.%*u %*u:%*u:%*u.%*u %c", &c) == 1 || (sscanf(ptr, "@%u @%u %c", &fs, &fe, &c) == 3 && fs < fe)); } static int jacosub_probe(const AVProbeData *p) { const char *ptr = p->buf; const char *ptr_end = p->buf + p->buf_size; if (AV_RB24(ptr) == 0xEFBBBF) ptr += 3; /* skip UTF-8 BOM */ while (ptr < ptr_end) { while (jss_whitespace(*ptr)) ptr++; if (*ptr != '#' && *ptr != '\n') { if (timed_line(ptr)) return AVPROBE_SCORE_EXTENSION + 1; return 0; } ptr += ff_subtitles_next_line(ptr); } return 0; } static const char * const cmds[] = { "CLOCKPAUSE", "DIRECTIVE", "FONT", "HRES", "INCLUDE", "PALETTE", "QUANTIZE", "RAMP", "SHIFT", "TIMERES", }; static int get_jss_cmd(char k) { int i; k = av_toupper(k); for (i = 0; i < FF_ARRAY_ELEMS(cmds); i++) if (k == cmds[i][0]) return i; return -1; } static const char *read_ts(JACOsubContext *jacosub, const char *buf, int64_t *start, int64_t *duration) { int len; unsigned hs, ms, ss, fs; // hours, minutes, seconds, frame start unsigned he, me, se, fe; // hours, minutes, seconds, frame end int ts_start, ts_end; int64_t ts_start64, ts_end64; /* timed format */ if (sscanf(buf, "%u:%u:%u.%u %u:%u:%u.%u %n", &hs, &ms, &ss, &fs, &he, &me, &se, &fe, &len) == 8) { ts_start = (hs*3600 + ms*60 + ss) * jacosub->timeres + fs; ts_end = (he*3600 + me*60 + se) * jacosub->timeres + fe; goto shift_and_ret; } /* timestamps format */ if (sscanf(buf, "@%u @%u %n", &ts_start, &ts_end, &len) == 2) goto shift_and_ret; return NULL; shift_and_ret: ts_start64 = (ts_start + (int64_t)jacosub->shift) * 100LL / jacosub->timeres; ts_end64 = (ts_end + (int64_t)jacosub->shift) * 100LL / jacosub->timeres; *start = ts_start64; *duration = ts_end64 - ts_start64; return buf + len; } static int get_shift(int timeres, const char *buf) { int sign = 1; int a = 0, b = 0, c = 0, d = 0; int64_t ret; #define SSEP "%*1[.:]" int n = sscanf(buf, "%d"SSEP"%d"SSEP"%d"SSEP"%d", &a, &b, &c, &d); #undef SSEP if (a == INT_MIN) return 0; if (*buf == '-' || a < 0) { sign = -1; a = FFABS(a); } ret = 0; switch (n) { case 4: ret = sign * (((int64_t)a*3600 + (int64_t)b*60 + c) * timeres + d); break; case 3: ret = sign * (( (int64_t)a*60 + b) * timeres + c); break; case 2: ret = sign * (( (int64_t)a) * timeres + b); break; } if ((int)ret != ret) ret = 0; return ret; } static int jacosub_read_header(AVFormatContext *s) { AVBPrint header; AVIOContext *pb = s->pb; char line[JSS_MAX_LINESIZE]; JACOsubContext *jacosub = s->priv_data; int shift_set = 0; // only the first shift matters int merge_line = 0; int i, ret; AVStream *st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); avpriv_set_pts_info(st, 64, 1, 100); st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; st->codecpar->codec_id = AV_CODEC_ID_JACOSUB; jacosub->timeres = 30; av_bprint_init(&header, 1024+AV_INPUT_BUFFER_PADDING_SIZE, 4096); while (!avio_feof(pb)) { int cmd_len; const char *p = line; int64_t pos = avio_tell(pb); int len = ff_get_line(pb, line, sizeof(line)); p = jss_skip_whitespace(p); /* queue timed line */ if (merge_line || timed_line(p)) { AVPacket *sub; sub = ff_subtitles_queue_insert(&jacosub->q, line, len, merge_line); if (!sub) { av_bprint_finalize(&header, NULL); return AVERROR(ENOMEM); } sub->pos = pos; merge_line = len > 1 && !strcmp(&line[len - 2], "\\\n"); continue; } /* skip all non-compiler commands and focus on the command */ if (*p != '#') continue; p++; i = get_jss_cmd(p[0]); if (i == -1) continue; /* trim command + spaces */ cmd_len = strlen(cmds[i]); if (av_strncasecmp(p, cmds[i], cmd_len) == 0) p += cmd_len; else p++; p = jss_skip_whitespace(p); /* handle commands which affect the whole script */ switch (cmds[i][0]) { case 'S': // SHIFT command affect the whole script... if (!shift_set) { jacosub->shift = get_shift(jacosub->timeres, p); shift_set = 1; } av_bprintf(&header, "#S %s", p); break; case 'T': // ...but must be placed after TIMERES jacosub->timeres = strtol(p, NULL, 10); if (!jacosub->timeres) jacosub->timeres = 30; else av_bprintf(&header, "#T %s", p); break; } } /* general/essential directives in the extradata */ ret = ff_bprint_to_codecpar_extradata(st->codecpar, &header); if (ret < 0) return ret; /* SHIFT and TIMERES affect the whole script so packet timing can only be * done in a second pass */ for (i = 0; i < jacosub->q.nb_subs; i++) { AVPacket *sub = jacosub->q.subs[i]; read_ts(jacosub, sub->data, &sub->pts, &sub->duration); } ff_subtitles_queue_finalize(s, &jacosub->q); return 0; } const AVInputFormat ff_jacosub_demuxer = { .name = "jacosub", .long_name = NULL_IF_CONFIG_SMALL("JACOsub subtitle format"), .priv_data_size = sizeof(JACOsubContext), .flags_internal = FF_FMT_INIT_CLEANUP, .read_probe = jacosub_probe, .read_header = jacosub_read_header, .read_packet = ff_subtitles_read_packet, .read_seek2 = ff_subtitles_read_seek, .read_close = ff_subtitles_read_close, };