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2ba45a60 DM |
1 | /* |
2 | * SubRip subtitle muxer | |
3 | * Copyright (c) 2012 Nicolas George <nicolas.george@normalesup.org> | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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 | |
20 | */ | |
21 | ||
22 | #include "avformat.h" | |
23 | #include "internal.h" | |
24 | #include "libavutil/log.h" | |
25 | #include "libavutil/intreadwrite.h" | |
26 | ||
27 | /* TODO: add options for: | |
28 | - character encoding; | |
29 | - LF / CRLF; | |
30 | - byte order mark. | |
31 | */ | |
32 | ||
33 | typedef struct SRTContext{ | |
34 | unsigned index; | |
35 | } SRTContext; | |
36 | ||
37 | static int srt_write_header(AVFormatContext *avf) | |
38 | { | |
39 | SRTContext *srt = avf->priv_data; | |
40 | ||
41 | if (avf->nb_streams != 1 || | |
42 | avf->streams[0]->codec->codec_type != AVMEDIA_TYPE_SUBTITLE) { | |
43 | av_log(avf, AV_LOG_ERROR, | |
44 | "SRT supports only a single subtitles stream.\n"); | |
45 | return AVERROR(EINVAL); | |
46 | } | |
47 | if (avf->streams[0]->codec->codec_id != AV_CODEC_ID_TEXT && | |
48 | avf->streams[0]->codec->codec_id != AV_CODEC_ID_SUBRIP && | |
49 | avf->streams[0]->codec->codec_id != AV_CODEC_ID_SRT) { | |
50 | av_log(avf, AV_LOG_ERROR, | |
51 | "Unsupported subtitles codec: %s\n", | |
52 | avcodec_get_name(avf->streams[0]->codec->codec_id)); | |
53 | return AVERROR(EINVAL); | |
54 | } | |
55 | avpriv_set_pts_info(avf->streams[0], 64, 1, 1000); | |
56 | srt->index = 1; | |
57 | return 0; | |
58 | } | |
59 | ||
60 | static int srt_write_packet(AVFormatContext *avf, AVPacket *pkt) | |
61 | { | |
62 | SRTContext *srt = avf->priv_data; | |
63 | int write_ts = avf->streams[0]->codec->codec_id != AV_CODEC_ID_SRT; | |
64 | ||
65 | if (write_ts) { | |
66 | int64_t s = pkt->pts, e, d = pkt->duration; | |
67 | int size, x1 = -1, y1 = -1, x2 = -1, y2 = -1; | |
68 | const uint8_t *p; | |
69 | ||
70 | p = av_packet_get_side_data(pkt, AV_PKT_DATA_SUBTITLE_POSITION, &size); | |
71 | if (p && size == 16) { | |
72 | x1 = AV_RL32(p ); | |
73 | y1 = AV_RL32(p + 4); | |
74 | x2 = AV_RL32(p + 8); | |
75 | y2 = AV_RL32(p + 12); | |
76 | } | |
77 | ||
78 | if (d <= 0) | |
79 | /* For backward compatibility, fallback to convergence_duration. */ | |
80 | d = pkt->convergence_duration; | |
81 | if (s == AV_NOPTS_VALUE || d < 0) { | |
82 | av_log(avf, AV_LOG_WARNING, | |
83 | "Insufficient timestamps in event number %d.\n", srt->index); | |
84 | return 0; | |
85 | } | |
86 | e = s + d; | |
87 | avio_printf(avf->pb, "%d\n%02d:%02d:%02d,%03d --> %02d:%02d:%02d,%03d", | |
88 | srt->index, | |
89 | (int)(s / 3600000), (int)(s / 60000) % 60, | |
90 | (int)(s / 1000) % 60, (int)(s % 1000), | |
91 | (int)(e / 3600000), (int)(e / 60000) % 60, | |
92 | (int)(e / 1000) % 60, (int)(e % 1000)); | |
93 | if (p) | |
94 | avio_printf(avf->pb, " X1:%03d X2:%03d Y1:%03d Y2:%03d", | |
95 | x1, x2, y1, y2); | |
96 | avio_printf(avf->pb, "\n"); | |
97 | } | |
98 | avio_write(avf->pb, pkt->data, pkt->size); | |
99 | if (write_ts) | |
100 | avio_write(avf->pb, "\n\n", 2); | |
101 | srt->index++; | |
102 | return 0; | |
103 | } | |
104 | ||
105 | AVOutputFormat ff_srt_muxer = { | |
106 | .name = "srt", | |
107 | .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"), | |
108 | .mime_type = "application/x-subrip", | |
109 | .extensions = "srt", | |
110 | .priv_data_size = sizeof(SRTContext), | |
111 | .write_header = srt_write_header, | |
112 | .write_packet = srt_write_packet, | |
113 | .flags = AVFMT_VARIABLE_FPS | AVFMT_TS_NONSTRICT, | |
114 | .subtitle_codec = AV_CODEC_ID_SUBRIP, | |
115 | }; |