1/* 2 * Copyright (c) 2012 Cl��ment B��sch 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 * AQTitle subtitles format demuxer 24 * 25 * @see http://web.archive.org/web/20070210095721/http://www.volny.cz/aberka/czech/aqt.html 26 * @see https://trac.annodex.net/wiki/AQTitle 27 */ 28 29#include "avformat.h" 30#include "internal.h" 31#include "subtitles.h" 32#include "libavutil/opt.h" 33 34typedef struct { 35 const AVClass *class; 36 FFDemuxSubtitlesQueue q; 37 AVRational frame_rate; 38} AQTitleContext; 39 40static int aqt_probe(AVProbeData *p) 41{ 42 int frame; 43 const char *ptr = p->buf; 44 45 if (sscanf(ptr, "-->> %d", &frame) == 1) 46 return AVPROBE_SCORE_EXTENSION; 47 return 0; 48} 49 50static int aqt_read_header(AVFormatContext *s) 51{ 52 AQTitleContext *aqt = s->priv_data; 53 AVStream *st = avformat_new_stream(s, NULL); 54 int new_event = 1; 55 int64_t pos = 0, frame = AV_NOPTS_VALUE; 56 AVPacket *sub = NULL; 57 58 if (!st) 59 return AVERROR(ENOMEM); 60 avpriv_set_pts_info(st, 64, aqt->frame_rate.den, aqt->frame_rate.num); 61 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; 62 st->codec->codec_id = AV_CODEC_ID_TEXT; 63 64 while (!url_feof(s->pb)) { 65 char line[4096]; 66 int len = ff_get_line(s->pb, line, sizeof(line)); 67 68 if (!len) 69 break; 70 71 line[strcspn(line, "\r\n")] = 0; 72 73 if (sscanf(line, "-->> %"SCNd64, &frame) == 1) { 74 new_event = 1; 75 pos = avio_tell(s->pb); 76 if (sub) { 77 sub->duration = frame - sub->pts; 78 sub = NULL; 79 } 80 } else if (*line) { 81 if (!new_event) { 82 sub = ff_subtitles_queue_insert(&aqt->q, "\n", 1, 1); 83 if (!sub) 84 return AVERROR(ENOMEM); 85 } 86 sub = ff_subtitles_queue_insert(&aqt->q, line, strlen(line), !new_event); 87 if (!sub) 88 return AVERROR(ENOMEM); 89 if (new_event) { 90 sub->pts = frame; 91 sub->duration = -1; 92 sub->pos = pos; 93 } 94 new_event = 0; 95 } 96 } 97 98 ff_subtitles_queue_finalize(&aqt->q); 99 return 0; 100} 101 102static int aqt_read_packet(AVFormatContext *s, AVPacket *pkt) 103{ 104 AQTitleContext *aqt = s->priv_data; 105 return ff_subtitles_queue_read_packet(&aqt->q, pkt); 106} 107 108static int aqt_read_seek(AVFormatContext *s, int stream_index, 109 int64_t min_ts, int64_t ts, int64_t max_ts, int flags) 110{ 111 AQTitleContext *aqt = s->priv_data; 112 return ff_subtitles_queue_seek(&aqt->q, s, stream_index, 113 min_ts, ts, max_ts, flags); 114} 115 116static int aqt_read_close(AVFormatContext *s) 117{ 118 AQTitleContext *aqt = s->priv_data; 119 ff_subtitles_queue_clean(&aqt->q); 120 return 0; 121} 122 123#define OFFSET(x) offsetof(AQTitleContext, x) 124#define SD AV_OPT_FLAG_SUBTITLE_PARAM|AV_OPT_FLAG_DECODING_PARAM 125static const AVOption aqt_options[] = { 126 { "subfps", "set the movie frame rate", OFFSET(frame_rate), AV_OPT_TYPE_RATIONAL, {.dbl=25}, 0, INT_MAX, SD }, 127 { NULL } 128}; 129 130static const AVClass aqt_class = { 131 .class_name = "aqtdec", 132 .item_name = av_default_item_name, 133 .option = aqt_options, 134 .version = LIBAVUTIL_VERSION_INT, 135}; 136 137AVInputFormat ff_aqtitle_demuxer = { 138 .name = "aqtitle", 139 .long_name = NULL_IF_CONFIG_SMALL("AQTitle subtitles"), 140 .priv_data_size = sizeof(AQTitleContext), 141 .read_probe = aqt_probe, 142 .read_header = aqt_read_header, 143 .read_packet = aqt_read_packet, 144 .read_seek2 = aqt_read_seek, 145 .read_close = aqt_read_close, 146 .extensions = "aqt", 147 .priv_class = &aqt_class, 148}; 149