| /* | |
| * 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 "demux.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(unsigned timeres, const char *buf) | |
| { | |
| int sign = 1; | |
| int h = 0, m = 0, s = 0, d = 0; | |
| int64_t ret; | |
| #define SSEP "%*1[.:]" | |
| int n = sscanf(buf, "%d"SSEP"%d"SSEP"%d"SSEP"%d", &h, &m, &s, &d); | |
| #undef SSEP | |
| if (h == INT_MIN) | |
| return 0; | |
| if (*buf == '-' || h < 0) { | |
| sign = -1; | |
| h = FFABS(h); | |
| } | |
| ret = 0; | |
| switch (n) { | |
| case 1: h = 0; //clear all in case of a single parameter | |
| case 2: s = m; m = h; h = 0; //shift into second subsecondd | |
| case 3: d = s; s = m; m = h; h = 0; //shift into minute second subsecond | |
| } | |
| ret = (int64_t)h*3600 + (int64_t)m*60 + s; | |
| if (FFABS(ret) > (INT64_MAX - FFABS((int64_t)d)) / timeres) | |
| return 0; | |
| ret = sign * (ret * timeres + d); | |
| 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 | |
| int64_t timeres = strtol(p, NULL, 10); | |
| if (timeres <= 0 || timeres > UINT32_MAX) { | |
| jacosub->timeres = 30; | |
| } else { | |
| jacosub->timeres = timeres; | |
| 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 FFInputFormat ff_jacosub_demuxer = { | |
| .p.name = "jacosub", | |
| .p.long_name = NULL_IF_CONFIG_SMALL("JACOsub subtitle format"), | |
| .priv_data_size = sizeof(JACOsubContext), | |
| .flags_internal = FF_INFMT_FLAG_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, | |
| }; |