LCOV - code coverage report
Current view: top level - libavformat - jacosubdec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 102 119 85.7 %
Date: 2017-12-10 21:22:29 Functions: 8 9 88.9 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2012 Clément Bœsch
       3             :  *
       4             :  * This file is part of FFmpeg.
       5             :  *
       6             :  * FFmpeg is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU Lesser General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2.1 of the License, or (at your option) any later version.
      10             :  *
      11             :  * FFmpeg is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : /**
      22             :  * @file
      23             :  * JACOsub subtitle demuxer
      24             :  * @see http://unicorn.us.com/jacosub/jscripts.html
      25             :  * @todo Support P[ALETTE] directive.
      26             :  */
      27             : 
      28             : #include "avformat.h"
      29             : #include "internal.h"
      30             : #include "subtitles.h"
      31             : #include "libavcodec/internal.h"
      32             : #include "libavcodec/jacosub.h"
      33             : #include "libavutil/avstring.h"
      34             : #include "libavutil/bprint.h"
      35             : #include "libavutil/intreadwrite.h"
      36             : 
      37             : typedef struct {
      38             :     int shift;
      39             :     unsigned timeres;
      40             :     FFDemuxSubtitlesQueue q;
      41             : } JACOsubContext;
      42             : 
      43        6156 : static int timed_line(const char *ptr)
      44             : {
      45             :     char c;
      46             :     int fs, fe;
      47       12314 :     return (sscanf(ptr, "%*u:%*u:%*u.%*u %*u:%*u:%*u.%*u %c", &c) == 1 ||
      48        6148 :             (sscanf(ptr, "@%u @%u %c", &fs, &fe, &c) == 3 && fs < fe));
      49             : }
      50             : 
      51        6130 : static int jacosub_probe(AVProbeData *p)
      52             : {
      53        6130 :     const char *ptr     = p->buf;
      54        6130 :     const char *ptr_end = p->buf + p->buf_size;
      55             : 
      56        6130 :     if (AV_RB24(ptr) == 0xEFBBBF)
      57           8 :         ptr += 3; /* skip UTF-8 BOM */
      58             : 
      59       12303 :     while (ptr < ptr_end) {
      60       12420 :         while (jss_whitespace(*ptr))
      61          74 :             ptr++;
      62        6173 :         if (*ptr != '#' && *ptr != '\n') {
      63        6130 :             if (timed_line(ptr))
      64           1 :                 return AVPROBE_SCORE_EXTENSION + 1;
      65        6129 :             return 0;
      66             :         }
      67          43 :         ptr += ff_subtitles_next_line(ptr);
      68             :     }
      69           0 :     return 0;
      70             : }
      71             : 
      72             : static const char * const cmds[] = {
      73             :     "CLOCKPAUSE",
      74             :     "DIRECTIVE",
      75             :     "FONT",
      76             :     "HRES",
      77             :     "INCLUDE",
      78             :     "PALETTE",
      79             :     "QUANTIZE",
      80             :     "RAMP",
      81             :     "SHIFT",
      82             :     "TIMERES",
      83             : };
      84             : 
      85           5 : static int get_jss_cmd(char k)
      86             : {
      87             :     int i;
      88             : 
      89           5 :     k = av_toupper(k);
      90          52 :     for (i = 0; i < FF_ARRAY_ELEMS(cmds); i++)
      91          49 :         if (k == cmds[i][0])
      92           2 :             return i;
      93           3 :     return -1;
      94             : }
      95             : 
      96           1 : static int jacosub_read_close(AVFormatContext *s)
      97             : {
      98           1 :     JACOsubContext *jacosub = s->priv_data;
      99           1 :     ff_subtitles_queue_clean(&jacosub->q);
     100           1 :     return 0;
     101             : }
     102             : 
     103          11 : static const char *read_ts(JACOsubContext *jacosub, const char *buf,
     104             :                            int64_t *start, int64_t *duration)
     105             : {
     106             :     int len;
     107             :     unsigned hs, ms, ss, fs; // hours, minutes, seconds, frame start
     108             :     unsigned he, me, se, fe; // hours, minutes, seconds, frame end
     109             :     int ts_start, ts_end;
     110             : 
     111             :     /* timed format */
     112          11 :     if (sscanf(buf, "%u:%u:%u.%u %u:%u:%u.%u %n",
     113             :                &hs, &ms, &ss, &fs,
     114             :                &he, &me, &se, &fe, &len) == 8) {
     115           9 :         ts_start = (hs*3600 + ms*60 + ss) * jacosub->timeres + fs;
     116           9 :         ts_end   = (he*3600 + me*60 + se) * jacosub->timeres + fe;
     117           9 :         goto shift_and_ret;
     118             :     }
     119             : 
     120             :     /* timestamps format */
     121           2 :     if (sscanf(buf, "@%u @%u %n", &ts_start, &ts_end, &len) == 2)
     122           2 :         goto shift_and_ret;
     123             : 
     124           0 :     return NULL;
     125             : 
     126          11 : shift_and_ret:
     127          11 :     ts_start  = (ts_start + jacosub->shift) * 100 / jacosub->timeres;
     128          11 :     ts_end    = (ts_end   + jacosub->shift) * 100 / jacosub->timeres;
     129          11 :     *start    = ts_start;
     130          11 :     *duration = ts_start + ts_end;
     131          11 :     return buf + len;
     132             : }
     133             : 
     134           1 : static int get_shift(int timeres, const char *buf)
     135             : {
     136           1 :     int sign = 1;
     137           1 :     int a = 0, b = 0, c = 0, d = 0;
     138             : #define SSEP "%*1[.:]"
     139           1 :     int n = sscanf(buf, "%d"SSEP"%d"SSEP"%d"SSEP"%d", &a, &b, &c, &d);
     140             : #undef SSEP
     141             : 
     142           1 :     if (*buf == '-' || a < 0) {
     143           0 :         sign = -1;
     144           0 :         a = FFABS(a);
     145             :     }
     146             : 
     147           1 :     switch (n) {
     148           0 :     case 4: return sign * ((a*3600 + b*60 + c) * timeres + d);
     149           0 :     case 3: return sign * ((         a*60 + b) * timeres + c);
     150           1 :     case 2: return sign * ((                a) * timeres + b);
     151             :     }
     152             : 
     153           0 :     return 0;
     154             : }
     155             : 
     156           1 : static int jacosub_read_header(AVFormatContext *s)
     157             : {
     158             :     AVBPrint header;
     159           1 :     AVIOContext *pb = s->pb;
     160             :     char line[JSS_MAX_LINESIZE];
     161           1 :     JACOsubContext *jacosub = s->priv_data;
     162           1 :     int shift_set = 0; // only the first shift matters
     163           1 :     int merge_line = 0;
     164             :     int i, ret;
     165             : 
     166           1 :     AVStream *st = avformat_new_stream(s, NULL);
     167           1 :     if (!st)
     168           0 :         return AVERROR(ENOMEM);
     169           1 :     avpriv_set_pts_info(st, 64, 1, 100);
     170           1 :     st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
     171           1 :     st->codecpar->codec_id   = AV_CODEC_ID_JACOSUB;
     172             : 
     173           1 :     jacosub->timeres = 30;
     174             : 
     175           1 :     av_bprint_init(&header, 1024+AV_INPUT_BUFFER_PADDING_SIZE, 4096);
     176             : 
     177          35 :     while (!avio_feof(pb)) {
     178             :         int cmd_len;
     179          33 :         const char *p = line;
     180          33 :         int64_t pos = avio_tell(pb);
     181          33 :         int len = ff_get_line(pb, line, sizeof(line));
     182             : 
     183          33 :         p = jss_skip_whitespace(p);
     184             : 
     185             :         /* queue timed line */
     186          33 :         if (merge_line || timed_line(p)) {
     187             :             AVPacket *sub;
     188             : 
     189          18 :             sub = ff_subtitles_queue_insert(&jacosub->q, line, len, merge_line);
     190          18 :             if (!sub)
     191           0 :                 return AVERROR(ENOMEM);
     192          18 :             sub->pos = pos;
     193          18 :             merge_line = len > 1 && !strcmp(&line[len - 2], "\\\n");
     194          18 :             continue;
     195             :         }
     196             : 
     197             :         /* skip all non-compiler commands and focus on the command */
     198          15 :         if (*p != '#')
     199          10 :             continue;
     200           5 :         p++;
     201           5 :         i = get_jss_cmd(p[0]);
     202           5 :         if (i == -1)
     203           3 :             continue;
     204             : 
     205             :         /* trim command + spaces */
     206           2 :         cmd_len = strlen(cmds[i]);
     207           2 :         if (av_strncasecmp(p, cmds[i], cmd_len) == 0)
     208           1 :             p += cmd_len;
     209             :         else
     210           1 :             p++;
     211           2 :         p = jss_skip_whitespace(p);
     212             : 
     213             :         /* handle commands which affect the whole script */
     214           2 :         switch (cmds[i][0]) {
     215           1 :         case 'S': // SHIFT command affect the whole script...
     216           1 :             if (!shift_set) {
     217           1 :                 jacosub->shift = get_shift(jacosub->timeres, p);
     218           1 :                 shift_set = 1;
     219             :             }
     220           1 :             av_bprintf(&header, "#S %s", p);
     221           1 :             break;
     222           1 :         case 'T': // ...but must be placed after TIMERES
     223           1 :             jacosub->timeres = strtol(p, NULL, 10);
     224           1 :             if (!jacosub->timeres)
     225           0 :                 jacosub->timeres = 30;
     226             :             else
     227           1 :                 av_bprintf(&header, "#T %s", p);
     228           1 :             break;
     229             :         }
     230             :     }
     231             : 
     232             :     /* general/essential directives in the extradata */
     233           1 :     ret = ff_bprint_to_codecpar_extradata(st->codecpar, &header);
     234           1 :     if (ret < 0)
     235           0 :         goto fail;
     236             : 
     237             :     /* SHIFT and TIMERES affect the whole script so packet timing can only be
     238             :      * done in a second pass */
     239          12 :     for (i = 0; i < jacosub->q.nb_subs; i++) {
     240          11 :         AVPacket *sub = &jacosub->q.subs[i];
     241          11 :         read_ts(jacosub, sub->data, &sub->pts, &sub->duration);
     242             :     }
     243           1 :     ff_subtitles_queue_finalize(s, &jacosub->q);
     244             : 
     245           1 :     return 0;
     246           0 : fail:
     247           0 :     jacosub_read_close(s);
     248           0 :     return ret;
     249             : }
     250             : 
     251          12 : static int jacosub_read_packet(AVFormatContext *s, AVPacket *pkt)
     252             : {
     253          12 :     JACOsubContext *jacosub = s->priv_data;
     254          12 :     return ff_subtitles_queue_read_packet(&jacosub->q, pkt);
     255             : }
     256             : 
     257           0 : static int jacosub_read_seek(AVFormatContext *s, int stream_index,
     258             :                              int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
     259             : {
     260           0 :     JACOsubContext *jacosub = s->priv_data;
     261           0 :     return ff_subtitles_queue_seek(&jacosub->q, s, stream_index,
     262             :                                    min_ts, ts, max_ts, flags);
     263             : }
     264             : 
     265             : AVInputFormat ff_jacosub_demuxer = {
     266             :     .name           = "jacosub",
     267             :     .long_name      = NULL_IF_CONFIG_SMALL("JACOsub subtitle format"),
     268             :     .priv_data_size = sizeof(JACOsubContext),
     269             :     .read_probe     = jacosub_probe,
     270             :     .read_header    = jacosub_read_header,
     271             :     .read_packet    = jacosub_read_packet,
     272             :     .read_seek2     = jacosub_read_seek,
     273             :     .read_close     = jacosub_read_close,
     274             : };

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