3 * Copyright (c) 2010 Anton Khirnov
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 static int probe(AVProbeData *p)
28 if(!memcmp(p->buf, ID_STRING, strlen(ID_STRING)))
29 return AVPROBE_SCORE_MAX;
33 static void get_line(AVIOContext *s, uint8_t *buf, int size)
39 while ((c = avio_r8(s))) {
51 } while (!url_feof(s) && (buf[0] == ';' || buf[0] == '#' || buf[0] == 0));
54 static AVChapter *read_chapter(AVFormatContext *s)
58 AVRational tb = {1, 1e9};
60 get_line(s->pb, line, sizeof(line));
62 if (sscanf(line, "TIMEBASE=%d/%d", &tb.num, &tb.den))
63 get_line(s->pb, line, sizeof(line));
64 if (!sscanf(line, "START=%lld", &start)) {
65 av_log(s, AV_LOG_ERROR, "Expected chapter start timestamp, found %s.\n", line);
66 start = (s->nb_chapters && s->chapters[s->nb_chapters - 1]->end != AV_NOPTS_VALUE) ?
67 s->chapters[s->nb_chapters - 1]->end : 0;
69 get_line(s->pb, line, sizeof(line));
71 if (!sscanf(line, "END=%lld", &end)) {
72 av_log(s, AV_LOG_ERROR, "Expected chapter end timestamp, found %s.\n", line);
76 return ff_new_chapter(s, s->nb_chapters, tb, start, end, NULL);
79 static uint8_t *unescape(uint8_t *buf, int size)
81 uint8_t *ret = av_malloc(size + 1);
82 uint8_t *p1 = ret, *p2 = buf;
87 while (p2 < buf + size) {
96 static int read_tag(uint8_t *line, AVMetadata **m)
98 uint8_t *key, *value, *p = line;
100 /* find first not escaped '=' */
113 if (!(key = unescape(line, p - line)))
114 return AVERROR(ENOMEM);
115 if (!(value = unescape(p + 1, strlen(p + 1)))) {
117 return AVERROR(ENOMEM);
120 av_metadata_set2(m, key, value, AV_METADATA_DONT_STRDUP_KEY | AV_METADATA_DONT_STRDUP_VAL);
124 static int read_header(AVFormatContext *s, AVFormatParameters *ap)
126 AVMetadata **m = &s->metadata;
129 while(!url_feof(s->pb)) {
130 get_line(s->pb, line, sizeof(line));
132 if (!memcmp(line, ID_STREAM, strlen(ID_STREAM))) {
133 AVStream *st = av_new_stream(s, 0);
138 st->codec->codec_type = AVMEDIA_TYPE_DATA;
139 st->codec->codec_id = CODEC_ID_FFMETADATA;
142 } else if (!memcmp(line, ID_CHAPTER, strlen(ID_CHAPTER))) {
143 AVChapter *ch = read_chapter(s);
155 s->duration = av_rescale_q(s->chapters[s->nb_chapters - 1]->end,
156 s->chapters[s->nb_chapters - 1]->time_base,
162 static int read_packet(AVFormatContext *s, AVPacket *pkt)
167 AVInputFormat ff_ffmetadata_demuxer = {
168 .name = "ffmetadata",
169 .long_name = NULL_IF_CONFIG_SMALL("FFmpeg metadata in text format"),
171 .read_header = read_header,
172 .read_packet = read_packet,