Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / samidec.c
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1/*
2 * Copyright (c) 2012 Clément Bœsch
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 * SAMI subtitle decoder
24 * @see http://msdn.microsoft.com/en-us/library/ms971327.aspx
25 */
26
27#include "ass.h"
28#include "libavutil/avstring.h"
29#include "libavutil/bprint.h"
30
31typedef struct {
32 AVBPrint source;
33 AVBPrint content;
34 AVBPrint full;
35} SAMIContext;
36
37static int sami_paragraph_to_ass(AVCodecContext *avctx, const char *src)
38{
39 SAMIContext *sami = avctx->priv_data;
40 int ret = 0;
41 char *tag = NULL;
42 char *dupsrc = av_strdup(src);
43 char *p = dupsrc;
44
45 av_bprint_clear(&sami->content);
46 for (;;) {
47 char *saveptr = NULL;
48 int prev_chr_is_space = 0;
49 AVBPrint *dst = &sami->content;
50
51 /* parse & extract paragraph tag */
52 p = av_stristr(p, "<P");
53 if (!p)
54 break;
55 if (p[2] != '>' && !av_isspace(p[2])) { // avoid confusion with tags such as <PRE>
56 p++;
57 continue;
58 }
59 if (dst->len) // add a separator with the previous paragraph if there was one
60 av_bprintf(dst, "\\N");
61 tag = av_strtok(p, ">", &saveptr);
62 if (!tag || !saveptr)
63 break;
64 p = saveptr;
65
66 /* check if the current paragraph is the "source" (speaker name) */
67 if (av_stristr(tag, "ID=Source") || av_stristr(tag, "ID=\"Source\"")) {
68 dst = &sami->source;
69 av_bprint_clear(dst);
70 }
71
72 /* if empty event -> skip subtitle */
73 while (av_isspace(*p))
74 p++;
75 if (!strncmp(p, "&nbsp;", 6)) {
76 ret = -1;
77 goto end;
78 }
79
80 /* extract the text, stripping most of the tags */
81 while (*p) {
82 if (*p == '<') {
83 if (!av_strncasecmp(p, "<P", 2) && (p[2] == '>' || av_isspace(p[2])))
84 break;
85 if (!av_strncasecmp(p, "<BR", 3))
86 av_bprintf(dst, "\\N");
87 p++;
88 while (*p && *p != '>')
89 p++;
90 if (!*p)
91 break;
92 if (*p == '>')
93 p++;
94 }
95 if (!av_isspace(*p))
96 av_bprint_chars(dst, *p, 1);
97 else if (!prev_chr_is_space)
98 av_bprint_chars(dst, ' ', 1);
99 prev_chr_is_space = av_isspace(*p);
100 p++;
101 }
102 }
103
104 av_bprint_clear(&sami->full);
105 if (sami->source.len)
106 av_bprintf(&sami->full, "{\\i1}%s{\\i0}\\N", sami->source.str);
f6fa7814 107 av_bprintf(&sami->full, "%s", sami->content.str);
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108
109end:
110 av_free(dupsrc);
111 return ret;
112}
113
114static int sami_decode_frame(AVCodecContext *avctx,
115 void *data, int *got_sub_ptr, AVPacket *avpkt)
116{
117 AVSubtitle *sub = data;
118 const char *ptr = avpkt->data;
119 SAMIContext *sami = avctx->priv_data;
120
121 if (ptr && avpkt->size > 0 && !sami_paragraph_to_ass(avctx, ptr)) {
122 int ts_start = av_rescale_q(avpkt->pts, avctx->time_base, (AVRational){1,100});
123 int ts_duration = avpkt->duration != -1 ?
124 av_rescale_q(avpkt->duration, avctx->time_base, (AVRational){1,100}) : -1;
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125 int ret = ff_ass_add_rect_bprint(sub, &sami->full, ts_start, ts_duration);
126 if (ret < 0)
127 return ret;
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128 }
129 *got_sub_ptr = sub->num_rects > 0;
130 return avpkt->size;
131}
132
133static av_cold int sami_init(AVCodecContext *avctx)
134{
135 SAMIContext *sami = avctx->priv_data;
136 av_bprint_init(&sami->source, 0, 2048);
137 av_bprint_init(&sami->content, 0, 2048);
138 av_bprint_init(&sami->full, 0, 2048);
139 return ff_ass_subtitle_header_default(avctx);
140}
141
142static av_cold int sami_close(AVCodecContext *avctx)
143{
144 SAMIContext *sami = avctx->priv_data;
145 av_bprint_finalize(&sami->source, NULL);
146 av_bprint_finalize(&sami->content, NULL);
147 av_bprint_finalize(&sami->full, NULL);
148 return 0;
149}
150
151AVCodec ff_sami_decoder = {
152 .name = "sami",
153 .long_name = NULL_IF_CONFIG_SMALL("SAMI subtitle"),
154 .type = AVMEDIA_TYPE_SUBTITLE,
155 .id = AV_CODEC_ID_SAMI,
156 .priv_data_size = sizeof(SAMIContext),
157 .init = sami_init,
158 .close = sami_close,
159 .decode = sami_decode_frame,
160};