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