diff options
Diffstat (limited to 'libavformat/realtextdec.c')
| -rw-r--r-- | libavformat/realtextdec.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/libavformat/realtextdec.c b/libavformat/realtextdec.c new file mode 100644 index 0000000000..5e4981a40b --- /dev/null +++ b/libavformat/realtextdec.c @@ -0,0 +1,153 @@ +/* + * Copyright (c) 2012 Clément Bœsch + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file + * RealText subtitle demuxer + * @see http://service.real.com/help/library/guides/ProductionGuide/prodguide/htmfiles/realtext.htm + */ + +#include "avformat.h" +#include "internal.h" +#include "subtitles.h" +#include "libavutil/avstring.h" +#include "libavutil/bprint.h" +#include "libavutil/intreadwrite.h" + +typedef struct { + FFDemuxSubtitlesQueue q; +} RealTextContext; + +static int realtext_probe(AVProbeData *p) +{ + const unsigned char *ptr = p->buf; + + if (AV_RB24(ptr) == 0xEFBBBF) + ptr += 3; /* skip UTF-8 BOM */ + return !av_strncasecmp(ptr, "<window", 7) ? AVPROBE_SCORE_EXTENSION : 0; +} + +static int read_ts(const char *s) +{ + int hh, mm, ss, ms; + + if (sscanf(s, "%u:%u:%u.%u", &hh, &mm, &ss, &ms) == 4) return (hh*3600 + mm*60 + ss) * 100 + ms; + if (sscanf(s, "%u:%u:%u" , &hh, &mm, &ss ) == 3) return (hh*3600 + mm*60 + ss) * 100; + if (sscanf(s, "%u:%u.%u", &mm, &ss, &ms) == 3) return ( mm*60 + ss) * 100 + ms; + if (sscanf(s, "%u:%u" , &mm, &ss ) == 2) return ( mm*60 + ss) * 100; + if (sscanf(s, "%u.%u", &ss, &ms) == 2) return ( ss) * 100 + ms; + return strtol(s, NULL, 10) * 100; +} + +static int realtext_read_header(AVFormatContext *s) +{ + RealTextContext *rt = s->priv_data; + AVStream *st = avformat_new_stream(s, NULL); + AVBPrint buf; + char c = 0; + int res = 0, duration = read_ts("60"); // default duration is 60 seconds + + if (!st) + return AVERROR(ENOMEM); + avpriv_set_pts_info(st, 64, 1, 100); + st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; + st->codec->codec_id = AV_CODEC_ID_REALTEXT; + + av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); + + while (!url_feof(s->pb)) { + AVPacket *sub; + const int64_t pos = avio_tell(s->pb) - (c != 0); + int n = ff_smil_extract_next_chunk(s->pb, &buf, &c); + + if (n == 0) + break; + + if (!av_strncasecmp(buf.str, "<window", 7)) { + /* save header to extradata */ + const char *p = ff_smil_get_attr_ptr(buf.str, "duration"); + + if (p) + duration = read_ts(p); + st->codec->extradata = av_strdup(buf.str); + if (!st->codec->extradata) { + res = AVERROR(ENOMEM); + goto end; + } + st->codec->extradata_size = buf.len + 1; + } else { + /* if we just read a <time> tag, introduce a new event, otherwise merge + * with the previous one */ + int merge = !av_strncasecmp(buf.str, "<time", 5) ? 0 : 1; + sub = ff_subtitles_queue_insert(&rt->q, buf.str, buf.len, merge); + if (!sub) { + res = AVERROR(ENOMEM); + goto end; + } + if (!merge) { + const char *begin = ff_smil_get_attr_ptr(buf.str, "begin"); + const char *end = ff_smil_get_attr_ptr(buf.str, "end"); + + sub->pos = pos; + sub->pts = begin ? read_ts(begin) : 0; + sub->duration = end ? (read_ts(end) - sub->pts) : duration; + } + } + av_bprint_clear(&buf); + } + ff_subtitles_queue_finalize(&rt->q); + +end: + av_bprint_finalize(&buf, NULL); + return res; +} + +static int realtext_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + RealTextContext *rt = s->priv_data; + return ff_subtitles_queue_read_packet(&rt->q, pkt); +} + +static int realtext_read_seek(AVFormatContext *s, int stream_index, + int64_t min_ts, int64_t ts, int64_t max_ts, int flags) +{ + RealTextContext *rt = s->priv_data; + return ff_subtitles_queue_seek(&rt->q, s, stream_index, + min_ts, ts, max_ts, flags); +} + +static int realtext_read_close(AVFormatContext *s) +{ + RealTextContext *rt = s->priv_data; + ff_subtitles_queue_clean(&rt->q); + return 0; +} + +AVInputFormat ff_realtext_demuxer = { + .name = "realtext", + .long_name = NULL_IF_CONFIG_SMALL("RealText subtitle format"), + .priv_data_size = sizeof(RealTextContext), + .read_probe = realtext_probe, + .read_header = realtext_read_header, + .read_packet = realtext_read_packet, + .read_seek2 = realtext_read_seek, + .read_close = realtext_read_close, + .extensions = "rt", +}; |