FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/samidec.c
Date: 2021-09-24 20:55:06
Exec Total Coverage
Lines: 89 101 88.1%
Branches: 44 62 71.0%

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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 #include "htmlsubtitles.h"
31 #include "internal.h"
32
33 typedef struct {
34 AVBPrint source;
35 AVBPrint content;
36 AVBPrint encoded_source;
37 AVBPrint encoded_content;
38 AVBPrint full;
39 int readorder;
40 } SAMIContext;
41
42 167 static int sami_paragraph_to_ass(AVCodecContext *avctx, const char *src)
43 {
44 167 SAMIContext *sami = avctx->priv_data;
45 167 int ret = 0;
46 167 char *tag = NULL;
47 167 char *dupsrc = av_strdup(src);
48 167 char *p = dupsrc;
49 167 AVBPrint *dst_content = &sami->encoded_content;
50 167 AVBPrint *dst_source = &sami->encoded_source;
51
52
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167 if (!dupsrc)
53 return AVERROR(ENOMEM);
54
55 167 av_bprint_clear(&sami->encoded_content);
56 167 av_bprint_clear(&sami->content);
57 167 av_bprint_clear(&sami->encoded_source);
58 89 for (;;) {
59 256 char *saveptr = NULL;
60 256 int prev_chr_is_space = 0;
61 256 AVBPrint *dst = &sami->content;
62
63 /* parse & extract paragraph tag */
64 256 p = av_stristr(p, "<P");
65
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256 if (!p)
66 88 break;
67
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168 if (p[2] != '>' && !av_isspace(p[2])) { // avoid confusion with tags such as <PRE>
68 p++;
69 continue;
70 }
71
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168 if (dst->len) // add a separator with the previous paragraph if there was one
72 av_bprintf(dst, "\\N");
73 168 tag = av_strtok(p, ">", &saveptr);
74
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168 if (!tag || !saveptr)
75 break;
76 168 p = saveptr;
77
78 /* check if the current paragraph is the "source" (speaker name) */
79
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168 if (av_stristr(tag, "ID=Source") || av_stristr(tag, "ID=\"Source\"")) {
80 2 dst = &sami->source;
81 2 av_bprint_clear(dst);
82 }
83
84 /* if empty event -> skip subtitle */
85
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245 while (av_isspace(*p))
86 77 p++;
87
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168 if (!strncmp(p, "&nbsp;", 6)) {
88 79 ret = -1;
89 79 goto end;
90 }
91
92 /* extract the text, stripping most of the tags */
93
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6981 while (*p) {
94
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6893 if (*p == '<') {
95
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316 if (!av_strncasecmp(p, "<P", 2) && (p[2] == '>' || av_isspace(p[2])))
96 break;
97 }
98
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6892 if (!av_strncasecmp(p, "<BR", 3)) {
99 137 av_bprintf(dst, "\\N");
100 137 p++;
101
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411 while (*p && *p != '>')
102 274 p++;
103
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137 if (!*p)
104 break;
105
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137 if (*p == '>')
106 137 p++;
107 137 continue;
108 }
109
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6755 if (!av_isspace(*p))
110 5951 av_bprint_chars(dst, *p, 1);
111
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804 else if (!prev_chr_is_space)
112 683 av_bprint_chars(dst, ' ', 1);
113 6755 prev_chr_is_space = av_isspace(*p);
114 6755 p++;
115 }
116 }
117
118 88 av_bprint_clear(&sami->full);
119
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88 if (sami->source.len) {
120 9 ret = ff_htmlmarkup_to_ass(avctx, dst_source, sami->source.str);
121
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9 if (ret < 0)
122 goto end;
123 9 av_bprintf(&sami->full, "{\\i1}%s{\\i0}\\N", sami->encoded_source.str);
124 }
125 88 ret = ff_htmlmarkup_to_ass(avctx, dst_content, sami->content.str);
126
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88 if (ret < 0)
127 goto end;
128 88 av_bprintf(&sami->full, "%s", sami->encoded_content.str);
129
130 167 end:
131 167 av_free(dupsrc);
132 167 return ret;
133 }
134
135 167 static int sami_decode_frame(AVCodecContext *avctx,
136 void *data, int *got_sub_ptr, AVPacket *avpkt)
137 {
138 167 AVSubtitle *sub = data;
139 167 const char *ptr = avpkt->data;
140 167 SAMIContext *sami = avctx->priv_data;
141
142
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167 if (ptr && avpkt->size > 0) {
143 167 int ret = sami_paragraph_to_ass(avctx, ptr);
144
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167 if (ret < 0)
145 79 return ret;
146 // TODO: pass escaped sami->encoded_source.str as source
147 88 ret = ff_ass_add_rect(sub, sami->full.str, sami->readorder++, 0, NULL, NULL);
148
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88 if (ret < 0)
149 return ret;
150 }
151 88 *got_sub_ptr = sub->num_rects > 0;
152 88 return avpkt->size;
153 }
154
155 4 static av_cold int sami_init(AVCodecContext *avctx)
156 {
157 4 SAMIContext *sami = avctx->priv_data;
158 4 av_bprint_init(&sami->source, 0, 2048);
159 4 av_bprint_init(&sami->content, 0, 2048);
160 4 av_bprint_init(&sami->encoded_source, 0, 2048);
161 4 av_bprint_init(&sami->encoded_content, 0, 2048);
162 4 av_bprint_init(&sami->full, 0, 2048);
163 4 return ff_ass_subtitle_header_default(avctx);
164 }
165
166 4 static av_cold int sami_close(AVCodecContext *avctx)
167 {
168 4 SAMIContext *sami = avctx->priv_data;
169 4 av_bprint_finalize(&sami->source, NULL);
170 4 av_bprint_finalize(&sami->content, NULL);
171 4 av_bprint_finalize(&sami->encoded_source, NULL);
172 4 av_bprint_finalize(&sami->encoded_content, NULL);
173 4 av_bprint_finalize(&sami->full, NULL);
174 4 return 0;
175 }
176
177 static void sami_flush(AVCodecContext *avctx)
178 {
179 SAMIContext *sami = avctx->priv_data;
180 if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP))
181 sami->readorder = 0;
182 }
183
184 const AVCodec ff_sami_decoder = {
185 .name = "sami",
186 .long_name = NULL_IF_CONFIG_SMALL("SAMI subtitle"),
187 .type = AVMEDIA_TYPE_SUBTITLE,
188 .id = AV_CODEC_ID_SAMI,
189 .priv_data_size = sizeof(SAMIContext),
190 .init = sami_init,
191 .close = sami_close,
192 .decode = sami_decode_frame,
193 .flush = sami_flush,
194 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
195 };
196