LCOV - code coverage report
Current view: top level - libavformat - mpl2dec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 53 60 88.3 %
Date: 2017-12-16 21:16:39 Functions: 5 6 83.3 %

          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             :  * MPL2 subtitles format demuxer
      24             :  */
      25             : 
      26             : #include "libavutil/intreadwrite.h"
      27             : 
      28             : #include "avformat.h"
      29             : #include "internal.h"
      30             : #include "subtitles.h"
      31             : 
      32             : typedef struct {
      33             :     FFDemuxSubtitlesQueue q;
      34             : } MPL2Context;
      35             : 
      36        6130 : static int mpl2_probe(AVProbeData *p)
      37             : {
      38             :     int i;
      39             :     char c;
      40             :     int64_t start, end;
      41        6130 :     const unsigned char *ptr = p->buf;
      42        6130 :     const unsigned char *ptr_end = ptr + p->buf_size;
      43             : 
      44        6130 :     if (AV_RB24(ptr) == 0xefbbbf)
      45           8 :         ptr += 3;
      46             : 
      47        6132 :     for (i = 0; i < 2; i++) {
      48       12261 :         if (sscanf(ptr, "[%"SCNd64"][%"SCNd64"]%c", &start, &end, &c) != 3 &&
      49        6130 :             sscanf(ptr, "[%"SCNd64"][]%c",          &start,       &c) != 2)
      50        6129 :             return 0;
      51           2 :         ptr += ff_subtitles_next_line(ptr);
      52           2 :         if (ptr >= ptr_end)
      53           0 :             return 0;
      54             :     }
      55           1 :     return AVPROBE_SCORE_MAX;
      56             : }
      57             : 
      58           4 : static int read_ts(char **line, int64_t *pts_start, int *duration)
      59             : {
      60             :     char c;
      61             :     int len;
      62             :     int64_t end;
      63             : 
      64           4 :     if (sscanf(*line, "[%"SCNd64"][]%c%n",
      65             :                pts_start, &c, &len) >= 2) {
      66           1 :         *duration = -1;
      67           1 :         *line += len - 1;
      68           1 :         return 0;
      69             :     }
      70           3 :     if (sscanf(*line, "[%"SCNd64"][%"SCNd64"]%c%n",
      71             :                pts_start, &end, &c, &len) >= 3) {
      72           3 :         *duration = end - *pts_start;
      73           3 :         *line += len - 1;
      74           3 :         return 0;
      75             :     }
      76           0 :     return -1;
      77             : }
      78             : 
      79           1 : static int mpl2_read_header(AVFormatContext *s)
      80             : {
      81           1 :     MPL2Context *mpl2 = s->priv_data;
      82           1 :     AVStream *st = avformat_new_stream(s, NULL);
      83           1 :     int res = 0;
      84             : 
      85           1 :     if (!st)
      86           0 :         return AVERROR(ENOMEM);
      87           1 :     avpriv_set_pts_info(st, 64, 1, 10);
      88           1 :     st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
      89           1 :     st->codecpar->codec_id   = AV_CODEC_ID_MPL2;
      90             : 
      91           1 :     if (avio_rb24(s->pb) != 0xefbbbf)
      92           1 :         avio_seek(s->pb, -3, SEEK_CUR);
      93             : 
      94           6 :     while (!avio_feof(s->pb)) {
      95             :         char line[4096];
      96           5 :         char *p = line;
      97           5 :         const int64_t pos = avio_tell(s->pb);
      98           5 :         int len = ff_get_line(s->pb, line, sizeof(line));
      99             :         int64_t pts_start;
     100             :         int duration;
     101             : 
     102           5 :         if (!len)
     103           1 :             break;
     104             : 
     105           4 :         line[strcspn(line, "\r\n")] = 0;
     106             : 
     107           4 :         if (!read_ts(&p, &pts_start, &duration)) {
     108             :             AVPacket *sub;
     109             : 
     110           4 :             sub = ff_subtitles_queue_insert(&mpl2->q, p, strlen(p), 0);
     111           4 :             if (!sub)
     112           0 :                 return AVERROR(ENOMEM);
     113           4 :             sub->pos = pos;
     114           4 :             sub->pts = pts_start;
     115           4 :             sub->duration = duration;
     116             :         }
     117             :     }
     118             : 
     119           1 :     ff_subtitles_queue_finalize(s, &mpl2->q);
     120           1 :     return res;
     121             : }
     122             : 
     123           5 : static int mpl2_read_packet(AVFormatContext *s, AVPacket *pkt)
     124             : {
     125           5 :     MPL2Context *mpl2 = s->priv_data;
     126           5 :     return ff_subtitles_queue_read_packet(&mpl2->q, pkt);
     127             : }
     128             : 
     129           0 : static int mpl2_read_seek(AVFormatContext *s, int stream_index,
     130             :                           int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
     131             : {
     132           0 :     MPL2Context *mpl2 = s->priv_data;
     133           0 :     return ff_subtitles_queue_seek(&mpl2->q, s, stream_index,
     134             :                                    min_ts, ts, max_ts, flags);
     135             : }
     136             : 
     137           1 : static int mpl2_read_close(AVFormatContext *s)
     138             : {
     139           1 :     MPL2Context *mpl2 = s->priv_data;
     140           1 :     ff_subtitles_queue_clean(&mpl2->q);
     141           1 :     return 0;
     142             : }
     143             : 
     144             : AVInputFormat ff_mpl2_demuxer = {
     145             :     .name           = "mpl2",
     146             :     .long_name      = NULL_IF_CONFIG_SMALL("MPL2 subtitles"),
     147             :     .priv_data_size = sizeof(MPL2Context),
     148             :     .read_probe     = mpl2_probe,
     149             :     .read_header    = mpl2_read_header,
     150             :     .read_packet    = mpl2_read_packet,
     151             :     .read_seek2     = mpl2_read_seek,
     152             :     .read_close     = mpl2_read_close,
     153             :     .extensions     = "txt,mpl2",
     154             : };

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