1 /*****************************************************************************
2 * stl.c: EBU STL decoder
3 *****************************************************************************
4 * Copyright (C) 2010 Laurent Aimar
7 * Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU Lesser General Public License as published by
11 * the Free Software Foundation; either version 2.1 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public License
20 * along with this program; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
34 #include <vlc_codec.h>
35 #include <vlc_memory.h>
36 #include <vlc_charset.h>
38 /*****************************************************************************
40 *****************************************************************************/
41 static int Open (vlc_object_t *);
42 static void Close(vlc_object_t *);
45 set_description(N_("EBU STL subtitles decoder"))
46 set_category(CAT_INPUT)
47 set_subcategory(SUBCAT_INPUT_SCODEC)
48 set_capability("decoder", 10)
49 set_callbacks(Open, Close)
52 /*****************************************************************************
53 * Local definitions/prototypes
54 *****************************************************************************/
55 #define GSI_BLOCK_SIZE 1024
58 CCT_ISO_6937_2 = 0x3030, CCT_BEGIN = CCT_ISO_6937_2,
59 CCT_ISO_8859_5 = 0x3031,
60 CCT_ISO_8859_6 = 0x3032,
61 CCT_ISO_8859_7 = 0x3033,
62 CCT_ISO_8859_8 = 0x3034, CCT_END = CCT_ISO_8859_8
66 cct_number_value_t value;
70 struct decoder_sys_t {
71 cct_number_value_t cct;
74 static cct_number_t cct_nums[] = { {CCT_ISO_6937_2, "ISO_6937-2"},
75 {CCT_ISO_8859_5, "ISO_8859-5"},
76 {CCT_ISO_8859_6, "ISO_8859-6"},
77 {CCT_ISO_8859_7, "ISO_8859-7"},
78 {CCT_ISO_8859_8, "ISO_8859-8"} };
81 static char *ParseText(const uint8_t *data, size_t size, const char *charset)
83 char *text = malloc(size);
89 for (size_t i = 0; i < size; i++) {
90 uint8_t code = data[i];
96 /* TODO: italics begin/end 0x80/0x81, underline being/end 0x82/0x83 */
98 text[text_size++] = code;
100 text[text_size++] = '\n';
103 char *u8 = FromCharset(charset, text, text_size);
108 static subpicture_t *Decode(decoder_t *dec, block_t **block)
110 if (block == NULL || *block == NULL)
113 subpicture_t *sub = NULL;
115 block_t *b = *block; *block = NULL;
116 if (b->i_flags & (BLOCK_FLAG_DISCONTINUITY|BLOCK_FLAG_CORRUPTED))
118 if (b->i_buffer < 128)
121 int payload_size = (b->i_buffer / 128) * 112;
122 uint8_t *payload = malloc(payload_size);
125 for (unsigned i = 0; i < b->i_buffer / 128; i++)
126 memcpy(&payload[112 * i], &b->p_buffer[128 * i + 16], 112);
128 sub = decoder_NewSubpicture(dec, NULL);
133 sub->i_start = b->i_pts;
134 sub->i_stop = b->i_pts + b->i_length;
135 sub->b_ephemer = b->i_length == 0;
136 sub->b_absolute = false;
137 //sub->i_original_picture_width = 0;
138 //sub->i_original_picture_height = 0;
141 video_format_Init(&fmt, VLC_CODEC_TEXT);
142 sub->p_region = subpicture_region_New(&fmt);
143 video_format_Clean(&fmt);
146 sub->p_region->psz_text = ParseText(payload,
148 cct_nums[dec->p_sys->cct - CCT_BEGIN].str);
149 sub->p_region->i_align = SUBPICTURE_ALIGN_BOTTOM;
150 sub->p_region->psz_html = NULL;
160 static int ExtractCCT(const decoder_t *dec, cct_number_value_t *cct_number)
162 uint8_t *header = dec->fmt_in.p_extra;
164 msg_Err(dec, "NULL EBU header (GSI block)\n");
168 if (GSI_BLOCK_SIZE != dec->fmt_in.i_extra) {
169 msg_Err(dec, "EBU header is not in expected size (%d)\n", dec->fmt_in.i_extra);
173 int cct = (header[12] << 8) | header[13];
174 if (CCT_BEGIN > cct || CCT_END < cct) {
175 msg_Err(dec, "EBU header contains illegal CCT (0x%x)\n", cct);
184 static int Open(vlc_object_t *object)
186 decoder_t *dec = (decoder_t*)object;
188 if (dec->fmt_in.i_codec != VLC_CODEC_EBU_STL)
191 cct_number_value_t cct;
192 int rc = ExtractCCT(dec, &cct);
193 if (VLC_SUCCESS != rc)
196 msg_Dbg(dec, "CCT=0x%x", cct);
198 decoder_sys_t *sys = malloc(sizeof(*sys));
205 dec->pf_decode_sub = Decode;
206 dec->fmt_out.i_cat = SPU_ES;
207 dec->fmt_out.i_codec = 0;
211 static void Close(vlc_object_t *object)
213 decoder_t *dec = (decoder_t*)object;
214 decoder_sys_t *sys = dec->p_sys;