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  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.  * MPlayer subtitles format demuxer
  24.  */
  25.  
  26. #include "avformat.h"
  27. #include "internal.h"
  28. #include "subtitles.h"
  29.  
  30. typedef struct {
  31.     FFDemuxSubtitlesQueue q;
  32. } MPSubContext;
  33.  
  34. static int mpsub_probe(AVProbeData *p)
  35. {
  36.     const char *ptr     = p->buf;
  37.     const char *ptr_end = p->buf + p->buf_size;
  38.  
  39.     while (ptr < ptr_end) {
  40.         int inc;
  41.  
  42.         if (!memcmp(ptr, "FORMAT=TIME", 11))
  43.             return AVPROBE_SCORE_EXTENSION;
  44.         if (!memcmp(ptr, "FORMAT=", 7))
  45.             return AVPROBE_SCORE_EXTENSION / 3;
  46.         inc = ff_subtitles_next_line(ptr);
  47.         if (!inc)
  48.             break;
  49.         ptr += inc;
  50.     }
  51.     return 0;
  52. }
  53.  
  54. static int mpsub_read_header(AVFormatContext *s)
  55. {
  56.     MPSubContext *mpsub = s->priv_data;
  57.     AVStream *st;
  58.     AVBPrint buf;
  59.     AVRational pts_info = (AVRational){ 100, 1 }; // ts based by default
  60.     int res = 0;
  61.     float multiplier = 100.0;
  62.     float current_pts = 0;
  63.  
  64.     av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
  65.  
  66.     while (!url_feof(s->pb)) {
  67.         char line[1024];
  68.         float start, duration;
  69.         int fps, len = ff_get_line(s->pb, line, sizeof(line));
  70.  
  71.         if (!len)
  72.             break;
  73.  
  74.         line[strcspn(line, "\r\n")] = 0;
  75.  
  76.         if (sscanf(line, "FORMAT=%d", &fps) == 1 && fps > 3 && fps < 100) {
  77.             /* frame based timing */
  78.             pts_info = (AVRational){ fps, 1 };
  79.             multiplier = 1.0;
  80.         } else if (sscanf(line, "%f %f", &start, &duration) == 2) {
  81.             AVPacket *sub;
  82.             const int64_t pos = avio_tell(s->pb);
  83.  
  84.             ff_subtitles_read_chunk(s->pb, &buf);
  85.             if (buf.len) {
  86.                 sub = ff_subtitles_queue_insert(&mpsub->q, buf.str, buf.len, 0);
  87.                 if (!sub) {
  88.                     res = AVERROR(ENOMEM);
  89.                     goto end;
  90.                 }
  91.                 sub->pts = (int64_t)(current_pts + start*multiplier);
  92.                 sub->duration = (int)(duration * multiplier);
  93.                 current_pts += (start + duration) * multiplier;
  94.                 sub->pos = pos;
  95.             }
  96.         }
  97.     }
  98.  
  99.     st = avformat_new_stream(s, NULL);
  100.     if (!st)
  101.         return AVERROR(ENOMEM);
  102.     avpriv_set_pts_info(st, 64, pts_info.den, pts_info.num);
  103.     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
  104.     st->codec->codec_id   = AV_CODEC_ID_TEXT;
  105.  
  106.     ff_subtitles_queue_finalize(&mpsub->q);
  107.  
  108. end:
  109.     av_bprint_finalize(&buf, NULL);
  110.     return res;
  111. }
  112.  
  113. static int mpsub_read_packet(AVFormatContext *s, AVPacket *pkt)
  114. {
  115.     MPSubContext *mpsub = s->priv_data;
  116.     return ff_subtitles_queue_read_packet(&mpsub->q, pkt);
  117. }
  118.  
  119. static int mpsub_read_seek(AVFormatContext *s, int stream_index,
  120.                            int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
  121. {
  122.     MPSubContext *mpsub = s->priv_data;
  123.     return ff_subtitles_queue_seek(&mpsub->q, s, stream_index,
  124.                                    min_ts, ts, max_ts, flags);
  125. }
  126.  
  127. static int mpsub_read_close(AVFormatContext *s)
  128. {
  129.     MPSubContext *mpsub = s->priv_data;
  130.     ff_subtitles_queue_clean(&mpsub->q);
  131.     return 0;
  132. }
  133.  
  134. AVInputFormat ff_mpsub_demuxer = {
  135.     .name           = "mpsub",
  136.     .long_name      = NULL_IF_CONFIG_SMALL("MPlayer subtitles"),
  137.     .priv_data_size = sizeof(MPSubContext),
  138.     .read_probe     = mpsub_probe,
  139.     .read_header    = mpsub_read_header,
  140.     .read_packet    = mpsub_read_packet,
  141.     .read_seek2     = mpsub_read_seek,
  142.     .read_close     = mpsub_read_close,
  143.     .extensions     = "sub",
  144. };
  145.