aboutsummaryrefslogtreecommitdiffstats
path: root/libavcodec/textdec.c
blob: ba189e8900addb3bf5b9bfdf92af44aeeb26b7d1 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
/*
 * Copyright (c) 2012 Clément Bœsch
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

/**
 * @file
 * Raw subtitles decoder
 */

#include "avcodec.h"
#include "ass.h"
#include "libavutil/bprint.h"
#include "libavutil/opt.h"

typedef struct {
    AVClass *class;
    const char *linebreaks;
    int keep_ass_markup;
} TextContext;

#define OFFSET(x) offsetof(TextContext, x)
#define SD AV_OPT_FLAG_SUBTITLE_PARAM | AV_OPT_FLAG_DECODING_PARAM
static const AVOption options[] = {
    { "keep_ass_markup", "Set if ASS tags must be escaped", OFFSET(keep_ass_markup), AV_OPT_TYPE_INT,    {.i64=0}, 0, 1, .flags=SD },
    { NULL }
};

static int text_decode_frame(AVCodecContext *avctx, void *data,
                             int *got_sub_ptr, AVPacket *avpkt)
{
    int ret = 0;
    AVBPrint buf;
    AVSubtitle *sub = data;
    const char *ptr = avpkt->data;
    const TextContext *text = avctx->priv_data;
    const int ts_start     = av_rescale_q(avpkt->pts,      avctx->time_base, (AVRational){1,100});
    const int ts_duration  = avpkt->duration != -1 ?
                             av_rescale_q(avpkt->duration, avctx->time_base, (AVRational){1,100}) : -1;

    av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
    if (ptr && avpkt->size > 0 && *ptr) {
        ff_ass_bprint_text_event(&buf, ptr, avpkt->size, text->linebreaks, text->keep_ass_markup);
        ret = ff_ass_add_rect_bprint(sub, &buf, ts_start, ts_duration, 0);
    }
    av_bprint_finalize(&buf, NULL);
    if (ret < 0)
        return ret;
    *got_sub_ptr = sub->num_rects > 0;
    return avpkt->size;
}

#define DECLARE_CLASS(decname) static const AVClass decname ## _decoder_class = {   \
    .class_name = #decname " decoder",      \
    .item_name  = av_default_item_name,     \
    .option     = decname ## _options,      \
    .version    = LIBAVUTIL_VERSION_INT,    \
}

#if CONFIG_TEXT_DECODER
#define text_options options
DECLARE_CLASS(text);

AVCodec ff_text_decoder = {
    .name           = "text",
    .long_name      = NULL_IF_CONFIG_SMALL("Raw text subtitle"),
    .priv_data_size = sizeof(TextContext),
    .type           = AVMEDIA_TYPE_SUBTITLE,
    .id             = AV_CODEC_ID_TEXT,
    .decode         = text_decode_frame,
    .init           = ff_ass_subtitle_header_default,
    .priv_class     = &text_decoder_class,
};
#endif

#if CONFIG_VPLAYER_DECODER || CONFIG_PJS_DECODER || CONFIG_SUBVIEWER1_DECODER

static int linebreak_init(AVCodecContext *avctx)
{
    TextContext *text = avctx->priv_data;
    text->linebreaks = "|";
    return ff_ass_subtitle_header_default(avctx);
}

#if CONFIG_VPLAYER_DECODER
#define vplayer_options options
DECLARE_CLASS(vplayer);

AVCodec ff_vplayer_decoder = {
    .name           = "vplayer",
    .long_name      = NULL_IF_CONFIG_SMALL("VPlayer subtitle"),
    .priv_data_size = sizeof(TextContext),
    .type           = AVMEDIA_TYPE_SUBTITLE,
    .id             = AV_CODEC_ID_VPLAYER,
    .decode         = text_decode_frame,
    .init           = linebreak_init,
    .priv_class     = &vplayer_decoder_class,
};
#endif

#if CONFIG_PJS_DECODER
#define pjs_options options
DECLARE_CLASS(pjs);

AVCodec ff_pjs_decoder = {
    .name           = "pjs",
    .long_name      = NULL_IF_CONFIG_SMALL("PJS subtitle"),
    .priv_data_size = sizeof(TextContext),
    .type           = AVMEDIA_TYPE_SUBTITLE,
    .id             = AV_CODEC_ID_PJS,
    .decode         = text_decode_frame,
    .init           = linebreak_init,
    .priv_class     = &pjs_decoder_class,
};
#endif

#if CONFIG_SUBVIEWER1_DECODER
#define subviewer1_options options
DECLARE_CLASS(subviewer1);

AVCodec ff_subviewer1_decoder = {
    .name           = "subviewer1",
    .long_name      = NULL_IF_CONFIG_SMALL("SubViewer1 subtitle"),
    .priv_data_size = sizeof(TextContext),
    .type           = AVMEDIA_TYPE_SUBTITLE,
    .id             = AV_CODEC_ID_SUBVIEWER1,
    .decode         = text_decode_frame,
    .init           = linebreak_init,
    .priv_class     = &subviewer1_decoder_class,
};
#endif

#endif /* text subtitles with '|' line break */