Statistics
| Branch: | Revision:

ffmpeg / libavcodec / ass.c @ 2912e87a

History | View | Annotate | Download (4.75 KB)

1
/*
2
 * SSA/ASS common funtions
3
 * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
4
 *
5
 * This file is part of Libav.
6
 *
7
 * Libav 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
 * Libav 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 Libav; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
#include "avcodec.h"
23
#include "ass.h"
24

    
25
/**
26
 * Generate a suitable AVCodecContext.subtitle_header for SUBTITLE_ASS.
27
 *
28
 * @param avctx pointer to the AVCodecContext
29
 * @param font name of the default font face to use
30
 * @param font_size default font size to use
31
 * @param color default text color to use (ABGR)
32
 * @param back_color default background color to use (ABGR)
33
 * @param bold 1 for bold text, 0 for normal text
34
 * @param italic 1 for italic text, 0 for normal text
35
 * @param underline 1 for underline text, 0 for normal text
36
 * @param alignment position of the text (left, center, top...), defined after
37
 *                  the layout of the numpad (1-3 sub, 4-6 mid, 7-9 top)
38
 * @return >= 0 on success otherwise an error code <0
39
 */
40
static int ff_ass_subtitle_header(AVCodecContext *avctx,
41
                                  const char *font, int font_size,
42
                                  int color, int back_color,
43
                                  int bold, int italic, int underline,
44
                                  int alignment)
45
{
46
    char header[512];
47

    
48
    snprintf(header, sizeof(header),
49
             "[Script Info]\r\n"
50
             "ScriptType: v4.00+\r\n"
51
             "\r\n"
52
             "[V4+ Styles]\r\n"
53
             "Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, AlphaLevel, Encoding\r\n"
54
             "Style: Default,%s,%d,&H%x,&H%x,&H%x,&H%x,%d,%d,%d,1,1,0,%d,10,10,10,0,0\r\n"
55
             "\r\n"
56
             "[Events]\r\n"
57
             "Format: Layer, Start, End, Text\r\n",
58
             font, font_size, color, color, back_color, back_color,
59
             -bold, -italic, -underline, alignment);
60

    
61
    avctx->subtitle_header = av_strdup(header);
62
    if (!avctx->subtitle_header)
63
        return AVERROR(ENOMEM);
64
    avctx->subtitle_header_size = strlen(avctx->subtitle_header);
65
    return 0;
66
}
67

    
68
int ff_ass_subtitle_header_default(AVCodecContext *avctx)
69
{
70
    return ff_ass_subtitle_header(avctx, ASS_DEFAULT_FONT,
71
                                         ASS_DEFAULT_FONT_SIZE,
72
                                         ASS_DEFAULT_COLOR,
73
                                         ASS_DEFAULT_BACK_COLOR,
74
                                         ASS_DEFAULT_BOLD,
75
                                         ASS_DEFAULT_ITALIC,
76
                                         ASS_DEFAULT_UNDERLINE,
77
                                         ASS_DEFAULT_ALIGNMENT);
78
}
79

    
80
void ff_ass_init(AVSubtitle *sub)
81
{
82
    memset(sub, 0, sizeof(*sub));
83
}
84

    
85
static int ts_to_string(char *str, int strlen, int ts)
86
{
87
    int h, m, s;
88
    h = ts/360000;  ts -= 360000*h;
89
    m = ts/  6000;  ts -=   6000*m;
90
    s = ts/   100;  ts -=    100*s;
91
    return snprintf(str, strlen, "%d:%02d:%02d.%02d", h, m, s, ts);
92
}
93

    
94
int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
95
                    int ts_start, int ts_end, int raw)
96
{
97
    int len = 0, dlen, duration = ts_end - ts_start;
98
    char s_start[16], s_end[16], header[48] = {0};
99
    AVSubtitleRect **rects;
100

    
101
    if (!raw) {
102
        ts_to_string(s_start, sizeof(s_start), ts_start);
103
        ts_to_string(s_end,   sizeof(s_end),   ts_end  );
104
        len = snprintf(header, sizeof(header), "Dialogue: 0,%s,%s,",
105
                       s_start, s_end);
106
    }
107

    
108
    dlen = strcspn(dialog, "\n");
109
    dlen += dialog[dlen] == '\n';
110

    
111
    rects = av_realloc(sub->rects, (sub->num_rects+1) * sizeof(*sub->rects));
112
    if (!rects)
113
        return AVERROR(ENOMEM);
114
    sub->rects = rects;
115
    sub->end_display_time = FFMAX(sub->end_display_time, 10 * duration);
116
    rects[sub->num_rects]       = av_mallocz(sizeof(*rects[0]));
117
    rects[sub->num_rects]->type = SUBTITLE_ASS;
118
    rects[sub->num_rects]->ass  = av_malloc(len + dlen + 1);
119
    strcpy (rects[sub->num_rects]->ass      , header);
120
    strncpy(rects[sub->num_rects]->ass + len, dialog, dlen);
121
    rects[sub->num_rects]->ass[len+dlen] = 0;
122
    sub->num_rects++;
123
    return dlen;
124
}