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 32typedef struct { 33 FFDemuxSubtitlesQueue q; 34} MPL2Context; 35 36static int mpl2_probe(const AVProbeData *p) 37{ 38 int i; 39 char c; 40 int64_t start, end; 41 const unsigned char *ptr = p->buf; 42 const unsigned char *ptr_end = ptr + p->buf_size; 43 44 if (AV_RB24(ptr) == 0xefbbbf) 45 ptr += 3; 46 47 for (i = 0; i < 2; i++) { 48 if (sscanf(ptr, "[%"SCNd64"][%"SCNd64"]%c", &start, &end, &c) != 3 && 49 sscanf(ptr, "[%"SCNd64"][]%c", &start, &c) != 2) 50 return 0; 51 ptr += ff_subtitles_next_line(ptr); 52 if (ptr >= ptr_end) 53 return 0; 54 } 55 return AVPROBE_SCORE_MAX; 56} 57 58static int read_ts(char **line, int64_t *pts_start, int64_t *duration) 59{ 60 char c; 61 int len; 62 int64_t end; 63 64 if (sscanf(*line, "[%"SCNd64"][]%c%n", 65 pts_start, &c, &len) >= 2) { 66 *duration = -1; 67 *line += len - 1; 68 return 0; 69 } 70 if (sscanf(*line, "[%"SCNd64"][%"SCNd64"]%c%n", 71 pts_start, &end, &c, &len) >= 3) { 72 if (end < *pts_start || end - (uint64_t)*pts_start > INT64_MAX) { 73 *duration = -1; 74 } else 75 *duration = end - *pts_start; 76 *line += len - 1; 77 return 0; 78 } 79 return -1; 80} 81 82static int mpl2_read_header(AVFormatContext *s) 83{ 84 MPL2Context *mpl2 = s->priv_data; 85 AVStream *st = avformat_new_stream(s, NULL); 86 87 if (!st) 88 return AVERROR(ENOMEM); 89 avpriv_set_pts_info(st, 64, 1, 10); 90 st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; 91 st->codecpar->codec_id = AV_CODEC_ID_MPL2; 92 93 if (avio_rb24(s->pb) != 0xefbbbf) 94 avio_seek(s->pb, -3, SEEK_CUR); 95 96 while (!avio_feof(s->pb)) { 97 char line[4096]; 98 char *p = line; 99 const int64_t pos = avio_tell(s->pb); 100 int len = ff_get_line(s->pb, line, sizeof(line)); 101 int64_t pts_start; 102 int64_t duration; 103 104 if (!len) 105 break; 106 107 line[strcspn(line, "\r\n")] = 0; 108 109 if (!read_ts(&p, &pts_start, &duration)) { 110 AVPacket *sub; 111 112 sub = ff_subtitles_queue_insert(&mpl2->q, p, strlen(p), 0); 113 if (!sub) 114 return AVERROR(ENOMEM); 115 sub->pos = pos; 116 sub->pts = pts_start; 117 sub->duration = duration; 118 } 119 } 120 121 ff_subtitles_queue_finalize(s, &mpl2->q); 122 return 0; 123} 124 125const AVInputFormat ff_mpl2_demuxer = { 126 .name = "mpl2", 127 .long_name = NULL_IF_CONFIG_SMALL("MPL2 subtitles"), 128 .priv_data_size = sizeof(MPL2Context), 129 .flags_internal = FF_FMT_INIT_CLEANUP, 130 .read_probe = mpl2_probe, 131 .read_header = mpl2_read_header, 132 .extensions = "txt,mpl2", 133 .read_packet = ff_subtitles_read_packet, 134 .read_seek2 = ff_subtitles_read_seek, 135 .read_close = ff_subtitles_read_close, 136}; 137