FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/samidec.c
Date: 2024-04-19 17:50:32
Exec Total Coverage
Lines: 88 101 87.1%
Functions: 4 5 80.0%
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 "libavutil/mem.h"
31 #include "codec_internal.h"
32 #include "htmlsubtitles.h"
33
34 typedef struct {
35 AVBPrint source;
36 AVBPrint content;
37 AVBPrint encoded_source;
38 AVBPrint encoded_content;
39 AVBPrint full;
40 int readorder;
41 } SAMIContext;
42
43 167 static int sami_paragraph_to_ass(AVCodecContext *avctx, const char *src)
44 {
45 167 SAMIContext *sami = avctx->priv_data;
46 167 int ret = 0;
47 167 char *tag = NULL;
48 167 char *dupsrc = av_strdup(src);
49 167 char *p = dupsrc;
50 167 AVBPrint *dst_content = &sami->encoded_content;
51 167 AVBPrint *dst_source = &sami->encoded_source;
52
53
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167 if (!dupsrc)
54 return AVERROR(ENOMEM);
55
56 167 av_bprint_clear(&sami->encoded_content);
57 167 av_bprint_clear(&sami->content);
58 167 av_bprint_clear(&sami->encoded_source);
59 89 for (;;) {
60 256 char *saveptr = NULL;
61 256 int prev_chr_is_space = 0;
62 256 AVBPrint *dst = &sami->content;
63
64 /* parse & extract paragraph tag */
65 256 p = av_stristr(p, "<P");
66
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256 if (!p)
67 88 break;
68
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168 if (p[2] != '>' && !av_isspace(p[2])) { // avoid confusion with tags such as <PRE>
69 p++;
70 continue;
71 }
72
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168 if (dst->len) // add a separator with the previous paragraph if there was one
73 av_bprintf(dst, "\\N");
74 168 tag = av_strtok(p, ">", &saveptr);
75
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168 if (!tag || !saveptr)
76 break;
77 168 p = saveptr;
78
79 /* check if the current paragraph is the "source" (speaker name) */
80
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168 if (av_stristr(tag, "ID=Source") || av_stristr(tag, "ID=\"Source\"")) {
81 2 dst = &sami->source;
82 2 av_bprint_clear(dst);
83 }
84
85 /* if empty event -> skip subtitle */
86
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245 while (av_isspace(*p))
87 77 p++;
88
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168 if (!strncmp(p, "&nbsp;", 6)) {
89 79 ret = -1;
90 79 goto end;
91 }
92
93 /* extract the text, stripping most of the tags */
94
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6981 while (*p) {
95
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6893 if (*p == '<') {
96
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316 if (!av_strncasecmp(p, "<P", 2) && (p[2] == '>' || av_isspace(p[2])))
97 break;
98 }
99
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6892 if (!av_strncasecmp(p, "<BR", 3)) {
100 137 av_bprintf(dst, "\\N");
101 137 p++;
102
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411 while (*p && *p != '>')
103 274 p++;
104
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137 if (!*p)
105 break;
106
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137 if (*p == '>')
107 137 p++;
108 137 continue;
109 }
110
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6755 if (!av_isspace(*p))
111 5951 av_bprint_chars(dst, *p, 1);
112
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804 else if (!prev_chr_is_space)
113 683 av_bprint_chars(dst, ' ', 1);
114 6755 prev_chr_is_space = av_isspace(*p);
115 6755 p++;
116 }
117 }
118
119 88 av_bprint_clear(&sami->full);
120
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88 if (sami->source.len) {
121 9 ret = ff_htmlmarkup_to_ass(avctx, dst_source, sami->source.str);
122
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9 if (ret < 0)
123 goto end;
124 9 av_bprintf(&sami->full, "{\\i1}%s{\\i0}\\N", sami->encoded_source.str);
125 }
126 88 ret = ff_htmlmarkup_to_ass(avctx, dst_content, sami->content.str);
127
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88 if (ret < 0)
128 goto end;
129 88 av_bprintf(&sami->full, "%s", sami->encoded_content.str);
130
131 167 end:
132 167 av_free(dupsrc);
133 167 return ret;
134 }
135
136 167 static int sami_decode_frame(AVCodecContext *avctx, AVSubtitle *sub,
137 int *got_sub_ptr, const AVPacket *avpkt)
138 {
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 FFCodec ff_sami_decoder = {
185 .p.name = "sami",
186 CODEC_LONG_NAME("SAMI subtitle"),
187 .p.type = AVMEDIA_TYPE_SUBTITLE,
188 .p.id = AV_CODEC_ID_SAMI,
189 .priv_data_size = sizeof(SAMIContext),
190 .init = sami_init,
191 .close = sami_close,
192 FF_CODEC_DECODE_SUB_CB(sami_decode_frame),
193 .flush = sami_flush,
194 };
195