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1 | /* |
2 | * Copyright (c) 2013 Matthew Heaney | |
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 | * WebVTT subtitle muxer | |
24 | * @see http://dev.w3.org/html5/webvtt/ | |
25 | */ | |
26 | ||
27 | #include "avformat.h" | |
28 | #include "internal.h" | |
29 | ||
30 | static void webvtt_write_time(AVIOContext *pb, int64_t millisec) | |
31 | { | |
32 | int64_t sec, min, hour; | |
33 | sec = millisec / 1000; | |
34 | millisec -= 1000 * sec; | |
35 | min = sec / 60; | |
36 | sec -= 60 * min; | |
37 | hour = min / 60; | |
38 | min -= 60 * hour; | |
39 | ||
40 | if (hour > 0) | |
41 | avio_printf(pb, "%"PRId64":", hour); | |
42 | ||
43 | avio_printf(pb, "%02"PRId64":%02"PRId64".%03"PRId64"", min, sec, millisec); | |
44 | } | |
45 | ||
46 | static int webvtt_write_header(AVFormatContext *ctx) | |
47 | { | |
48 | AVStream *s = ctx->streams[0]; | |
49 | AVIOContext *pb = ctx->pb; | |
50 | ||
51 | avpriv_set_pts_info(s, 64, 1, 1000); | |
52 | ||
53 | avio_printf(pb, "WEBVTT\n"); | |
54 | avio_flush(pb); | |
55 | ||
56 | return 0; | |
57 | } | |
58 | ||
59 | static int webvtt_write_packet(AVFormatContext *ctx, AVPacket *pkt) | |
60 | { | |
61 | AVIOContext *pb = ctx->pb; | |
62 | int id_size, settings_size; | |
63 | uint8_t *id, *settings; | |
64 | ||
65 | avio_printf(pb, "\n"); | |
66 | ||
67 | id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER, | |
68 | &id_size); | |
69 | ||
70 | if (id && id_size > 0) | |
71 | avio_printf(pb, "%.*s\n", id_size, id); | |
72 | ||
73 | webvtt_write_time(pb, pkt->pts); | |
74 | avio_printf(pb, " --> "); | |
75 | webvtt_write_time(pb, pkt->pts + pkt->duration); | |
76 | ||
77 | settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS, | |
78 | &settings_size); | |
79 | ||
80 | if (settings && settings_size > 0) | |
81 | avio_printf(pb, " %.*s", settings_size, settings); | |
82 | ||
83 | avio_printf(pb, "\n"); | |
84 | ||
85 | avio_write(pb, pkt->data, pkt->size); | |
86 | avio_printf(pb, "\n"); | |
87 | ||
88 | return 0; | |
89 | } | |
90 | ||
91 | AVOutputFormat ff_webvtt_muxer = { | |
92 | .name = "webvtt", | |
93 | .long_name = NULL_IF_CONFIG_SMALL("WebVTT subtitle"), | |
94 | .extensions = "vtt", | |
95 | .mime_type = "text/vtt", | |
96 | .flags = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT, | |
97 | .subtitle_codec = AV_CODEC_ID_WEBVTT, | |
98 | .write_header = webvtt_write_header, | |
99 | .write_packet = webvtt_write_packet, | |
100 | }; |