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 * MPlayer subtitles format demuxer 24 */ 25 26#include "avformat.h" 27#include "internal.h" 28#include "subtitles.h" 29 30typedef struct { 31 FFDemuxSubtitlesQueue q; 32} MPSubContext; 33 34static 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 54static 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 108end: 109 av_bprint_finalize(&buf, NULL); 110 return res; 111} 112 113static 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 119static 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 127static 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 134AVInputFormat 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