2 * Copyright (c) 2012 Clément Bœsch
4 * This file is part of FFmpeg.
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.
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.
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
23 * SAMI subtitle demuxer
24 * @see http://msdn.microsoft.com/en-us/library/ms971327.aspx
29 #include "subtitles.h"
30 #include "libavutil/avstring.h"
31 #include "libavutil/bprint.h"
32 #include "libavutil/intreadwrite.h"
35 FFDemuxSubtitlesQueue q;
38 static int sami_probe(AVProbeData *p)
40 const unsigned char *ptr = p->buf;
42 if (AV_RB24(ptr) == 0xEFBBBF)
43 ptr += 3; /* skip UTF-8 BOM */
44 return !strncmp(ptr, "<SAMI>", 6) ? AVPROBE_SCORE_MAX : 0;
47 static int sami_read_header(AVFormatContext *s)
49 SAMIContext *sami = s->priv_data;
50 AVStream *st = avformat_new_stream(s, NULL);
51 AVBPrint buf, hdr_buf;
53 int res = 0, got_first_sync_point = 0;
56 return AVERROR(ENOMEM);
57 avpriv_set_pts_info(st, 64, 1, 1000);
58 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
59 st->codec->codec_id = AV_CODEC_ID_SAMI;
61 av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
62 av_bprint_init(&hdr_buf, 0, AV_BPRINT_SIZE_UNLIMITED);
64 while (!url_feof(s->pb)) {
66 const int64_t pos = avio_tell(s->pb) - (c != 0);
67 int is_sync, n = ff_smil_extract_next_chunk(s->pb, &buf, &c);
72 is_sync = !av_strncasecmp(buf.str, "<SYNC", 5);
74 got_first_sync_point = 1;
76 if (!got_first_sync_point) {
77 av_bprintf(&hdr_buf, "%s", buf.str);
79 sub = ff_subtitles_queue_insert(&sami->q, buf.str, buf.len, !is_sync);
81 res = AVERROR(ENOMEM);
85 const char *p = ff_smil_get_attr_ptr(buf.str, "Start");
87 sub->pts = p ? strtol(p, NULL, 10) : 0;
91 av_bprint_clear(&buf);
94 st->codec->extradata_size = hdr_buf.len + 1;
95 av_bprint_finalize(&hdr_buf, (char **)&st->codec->extradata);
96 if (!st->codec->extradata) {
97 st->codec->extradata_size = 0;
98 res = AVERROR(ENOMEM);
102 ff_subtitles_queue_finalize(&sami->q);
105 av_bprint_finalize(&buf, NULL);
109 static int sami_read_packet(AVFormatContext *s, AVPacket *pkt)
111 SAMIContext *sami = s->priv_data;
112 return ff_subtitles_queue_read_packet(&sami->q, pkt);
115 static int sami_read_close(AVFormatContext *s)
117 SAMIContext *sami = s->priv_data;
118 ff_subtitles_queue_clean(&sami->q);
122 AVInputFormat ff_sami_demuxer = {
124 .long_name = NULL_IF_CONFIG_SMALL("SAMI subtitle format"),
125 .priv_data_size = sizeof(SAMIContext),
126 .read_probe = sami_probe,
127 .read_header = sami_read_header,
128 .read_packet = sami_read_packet,
129 .read_close = sami_read_close,
130 .flags = AVFMT_GENERIC_INDEX,
131 .extensions = "smi,sami",