blob: 4827de05d5a35ba7105e0c0cd9f08db342aeea60
| 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 | AVCodecParameters *par = ctx->streams[0]->codecpar; |
| 50 | AVIOContext *pb = ctx->pb; |
| 51 | |
| 52 | if (ctx->nb_streams != 1 || par->codec_id != AV_CODEC_ID_WEBVTT) { |
| 53 | av_log(ctx, AV_LOG_ERROR, "Exactly one WebVTT stream is needed.\n"); |
| 54 | return AVERROR(EINVAL); |
| 55 | } |
| 56 | |
| 57 | avpriv_set_pts_info(s, 64, 1, 1000); |
| 58 | |
| 59 | avio_printf(pb, "WEBVTT\n"); |
| 60 | avio_flush(pb); |
| 61 | |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | static int webvtt_write_packet(AVFormatContext *ctx, AVPacket *pkt) |
| 66 | { |
| 67 | AVIOContext *pb = ctx->pb; |
| 68 | int id_size, settings_size; |
| 69 | uint8_t *id, *settings; |
| 70 | |
| 71 | avio_printf(pb, "\n"); |
| 72 | |
| 73 | id = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_IDENTIFIER, |
| 74 | &id_size); |
| 75 | |
| 76 | if (id && id_size > 0) |
| 77 | avio_printf(pb, "%.*s\n", id_size, id); |
| 78 | |
| 79 | webvtt_write_time(pb, pkt->pts); |
| 80 | avio_printf(pb, " --> "); |
| 81 | webvtt_write_time(pb, pkt->pts + pkt->duration); |
| 82 | |
| 83 | settings = av_packet_get_side_data(pkt, AV_PKT_DATA_WEBVTT_SETTINGS, |
| 84 | &settings_size); |
| 85 | |
| 86 | if (settings && settings_size > 0) |
| 87 | avio_printf(pb, " %.*s", settings_size, settings); |
| 88 | |
| 89 | avio_printf(pb, "\n"); |
| 90 | |
| 91 | avio_write(pb, pkt->data, pkt->size); |
| 92 | avio_printf(pb, "\n"); |
| 93 | |
| 94 | return 0; |
| 95 | } |
| 96 | |
| 97 | AVOutputFormat ff_webvtt_muxer = { |
| 98 | .name = "webvtt", |
| 99 | .long_name = NULL_IF_CONFIG_SMALL("WebVTT subtitle"), |
| 100 | .extensions = "vtt", |
| 101 | .mime_type = "text/vtt", |
| 102 | .flags = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT, |
| 103 | .subtitle_codec = AV_CODEC_ID_WEBVTT, |
| 104 | .write_header = webvtt_write_header, |
| 105 | .write_packet = webvtt_write_packet, |
| 106 | }; |
| 107 |