| /* |
| * 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/internal.h" |
| #include "libavcodec/jacosub.h" |
| #include "libavutil/avstring.h" |
| #include "libavutil/bprint.h" |
| #include "libavutil/intreadwrite.h" |
| |
| typedef struct { |
| int shift; |
| unsigned timeres; |
| FFDemuxSubtitlesQueue q; |
| } 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 int jacosub_read_close(AVFormatContext *s) |
| { |
| JACOsubContext *jacosub = s->priv_data; |
| ff_subtitles_queue_clean(&jacosub->q); |
| return 0; |
| } |
| |
| 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 + jacosub->shift) * 100LL / jacosub->timeres; |
| ts_end64 = (ts_end + 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; |
| #define SSEP "%*1[.:]" |
| int n = sscanf(buf, "%d"SSEP"%d"SSEP"%d"SSEP"%d", &a, &b, &c, &d); |
| #undef SSEP |
| |
| if (*buf == '-' || a < 0) { |
| sign = -1; |
| a = FFABS(a); |
| } |
| |
| switch (n) { |
| case 4: return sign * ((a*3600 + b*60 + c) * timeres + d); |
| case 3: return sign * (( a*60 + b) * timeres + c); |
| case 2: return sign * (( a) * timeres + b); |
| } |
| |
| return 0; |
| } |
| |
| 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) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| 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) |
| goto fail; |
| |
| /* 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; |
| fail: |
| jacosub_read_close(s); |
| return ret; |
| } |
| |
| static int jacosub_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| JACOsubContext *jacosub = s->priv_data; |
| return ff_subtitles_queue_read_packet(&jacosub->q, pkt); |
| } |
| |
| static int jacosub_read_seek(AVFormatContext *s, int stream_index, |
| int64_t min_ts, int64_t ts, int64_t max_ts, int flags) |
| { |
| JACOsubContext *jacosub = s->priv_data; |
| return ff_subtitles_queue_seek(&jacosub->q, s, stream_index, |
| min_ts, ts, max_ts, flags); |
| } |
| |
| AVInputFormat ff_jacosub_demuxer = { |
| .name = "jacosub", |
| .long_name = NULL_IF_CONFIG_SMALL("JACOsub subtitle format"), |
| .priv_data_size = sizeof(JACOsubContext), |
| .read_probe = jacosub_probe, |
| .read_header = jacosub_read_header, |
| .read_packet = jacosub_read_packet, |
| .read_seek2 = jacosub_read_seek, |
| .read_close = jacosub_read_close, |
| }; |
