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/* |
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* 3GPP TS 26.245 Timed Text decoder |
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* Copyright (c) 2012 Philip Langdale <philipl@overt.org> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "avcodec.h" |
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#include "ass.h" |
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#include "libavutil/opt.h" |
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#include "libavutil/avstring.h" |
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#include "libavutil/common.h" |
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#include "libavutil/bprint.h" |
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#include "libavutil/intreadwrite.h" |
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#include "libavutil/mem.h" |
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#include "bytestream.h" |
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32 |
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#define STYLE_FLAG_BOLD (1<<0) |
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#define STYLE_FLAG_ITALIC (1<<1) |
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#define STYLE_FLAG_UNDERLINE (1<<2) |
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36 |
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#define BOX_SIZE_INITIAL 40 |
37 |
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38 |
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#define STYL_BOX (1<<0) |
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#define HLIT_BOX (1<<1) |
40 |
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#define HCLR_BOX (1<<2) |
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#define TWRP_BOX (1<<3) |
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43 |
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#define BOTTOM_LEFT 1 |
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#define BOTTOM_CENTER 2 |
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#define BOTTOM_RIGHT 3 |
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#define MIDDLE_LEFT 4 |
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#define MIDDLE_CENTER 5 |
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#define MIDDLE_RIGHT 6 |
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#define TOP_LEFT 7 |
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#define TOP_CENTER 8 |
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#define TOP_RIGHT 9 |
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#define RGB_TO_BGR(c) (((c) & 0xff) << 16 | ((c) & 0xff00) | (((c) >> 16) & 0xff)) |
54 |
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typedef struct { |
56 |
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uint16_t fontID; |
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const char *font; |
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uint8_t fontsize; |
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int color; |
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uint8_t alpha; |
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int back_color; |
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uint8_t back_alpha; |
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uint8_t bold; |
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uint8_t italic; |
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uint8_t underline; |
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int alignment; |
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} MovTextDefault; |
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typedef struct { |
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uint16_t fontID; |
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char *font; |
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} FontRecord; |
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typedef struct { |
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uint16_t style_start; |
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uint16_t style_end; |
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uint8_t style_flag; |
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uint8_t bold; |
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uint8_t italic; |
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uint8_t underline; |
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int color; |
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uint8_t alpha; |
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uint8_t fontsize; |
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uint16_t style_fontID; |
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} StyleBox; |
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typedef struct { |
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uint16_t hlit_start; |
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uint16_t hlit_end; |
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} HighlightBox; |
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92 |
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typedef struct { |
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uint8_t hlit_color[4]; |
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} HilightcolorBox; |
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typedef struct { |
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uint8_t wrap_flag; |
98 |
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} TextWrapBox; |
99 |
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100 |
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typedef struct { |
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AVClass *class; |
102 |
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StyleBox *s; |
103 |
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HighlightBox h; |
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HilightcolorBox c; |
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FontRecord *ftab; |
106 |
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TextWrapBox w; |
107 |
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MovTextDefault d; |
108 |
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uint8_t box_flags; |
109 |
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uint16_t style_entries, ftab_entries; |
110 |
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uint64_t tracksize; |
111 |
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int size_var; |
112 |
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int readorder; |
113 |
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int frame_width; |
114 |
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int frame_height; |
115 |
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} MovTextContext; |
116 |
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117 |
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typedef struct { |
118 |
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uint32_t type; |
119 |
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size_t base_size; |
120 |
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int (*decode)(const uint8_t *tsmb, MovTextContext *m, const AVPacket *avpkt); |
121 |
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} Box; |
122 |
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123 |
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15 |
static void mov_text_cleanup(MovTextContext *m) |
124 |
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{ |
125 |
✗✓ |
15 |
if (m->box_flags & STYL_BOX) { |
126 |
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av_freep(&m->s); |
127 |
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m->style_entries = 0; |
128 |
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} |
129 |
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15 |
} |
130 |
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131 |
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6 |
static void mov_text_cleanup_ftab(MovTextContext *m) |
132 |
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{ |
133 |
✓✓ |
12 |
for (unsigned i = 0; i < m->ftab_entries; i++) |
134 |
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6 |
av_freep(&m->ftab[i].font); |
135 |
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av_freep(&m->ftab); |
136 |
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m->ftab_entries = 0; |
137 |
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} |
138 |
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139 |
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6 |
static int mov_text_tx3g(AVCodecContext *avctx, MovTextContext *m) |
140 |
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{ |
141 |
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const uint8_t *tx3g_ptr = avctx->extradata; |
142 |
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6 |
int i, j = -1, font_length, remaining = avctx->extradata_size - BOX_SIZE_INITIAL; |
143 |
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int8_t v_align, h_align; |
144 |
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unsigned ftab_entries; |
145 |
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StyleBox s_default; |
146 |
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147 |
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6 |
m->ftab_entries = 0; |
148 |
✗✓ |
6 |
if (remaining < 0) |
149 |
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return -1; |
150 |
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151 |
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// Display Flags |
152 |
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6 |
tx3g_ptr += 4; |
153 |
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// Alignment |
154 |
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6 |
h_align = bytestream_get_byte(&tx3g_ptr); |
155 |
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6 |
v_align = bytestream_get_byte(&tx3g_ptr); |
156 |
✗✓ |
6 |
if (h_align == 0) { |
157 |
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if (v_align == 0) |
158 |
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m->d.alignment = TOP_LEFT; |
159 |
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if (v_align == 1) |
160 |
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m->d.alignment = MIDDLE_LEFT; |
161 |
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if (v_align == -1) |
162 |
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m->d.alignment = BOTTOM_LEFT; |
163 |
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} |
164 |
✓✗ |
6 |
if (h_align == 1) { |
165 |
✗✓ |
6 |
if (v_align == 0) |
166 |
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m->d.alignment = TOP_CENTER; |
167 |
✗✓ |
6 |
if (v_align == 1) |
168 |
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m->d.alignment = MIDDLE_CENTER; |
169 |
✓✗ |
6 |
if (v_align == -1) |
170 |
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m->d.alignment = BOTTOM_CENTER; |
171 |
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} |
172 |
✗✓ |
6 |
if (h_align == -1) { |
173 |
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if (v_align == 0) |
174 |
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m->d.alignment = TOP_RIGHT; |
175 |
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if (v_align == 1) |
176 |
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m->d.alignment = MIDDLE_RIGHT; |
177 |
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if (v_align == -1) |
178 |
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m->d.alignment = BOTTOM_RIGHT; |
179 |
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} |
180 |
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// Background Color |
181 |
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6 |
m->d.back_color = bytestream_get_be24(&tx3g_ptr); |
182 |
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6 |
m->d.back_alpha = bytestream_get_byte(&tx3g_ptr); |
183 |
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// BoxRecord |
184 |
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6 |
tx3g_ptr += 8; |
185 |
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// StyleRecord |
186 |
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tx3g_ptr += 4; |
187 |
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// fontID |
188 |
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6 |
m->d.fontID = bytestream_get_be16(&tx3g_ptr); |
189 |
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// face-style-flags |
190 |
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s_default.style_flag = bytestream_get_byte(&tx3g_ptr); |
191 |
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6 |
m->d.bold = !!(s_default.style_flag & STYLE_FLAG_BOLD); |
192 |
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6 |
m->d.italic = !!(s_default.style_flag & STYLE_FLAG_ITALIC); |
193 |
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m->d.underline = !!(s_default.style_flag & STYLE_FLAG_UNDERLINE); |
194 |
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// fontsize |
195 |
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6 |
m->d.fontsize = bytestream_get_byte(&tx3g_ptr); |
196 |
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// Primary color |
197 |
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6 |
m->d.color = bytestream_get_be24(&tx3g_ptr); |
198 |
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6 |
m->d.alpha = bytestream_get_byte(&tx3g_ptr); |
199 |
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// FontRecord |
200 |
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// FontRecord Size |
201 |
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6 |
tx3g_ptr += 4; |
202 |
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// ftab |
203 |
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6 |
tx3g_ptr += 4; |
204 |
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205 |
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// In case of broken header, init default font |
206 |
|
6 |
m->d.font = ASS_DEFAULT_FONT; |
207 |
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|
208 |
|
6 |
ftab_entries = bytestream_get_be16(&tx3g_ptr); |
209 |
✗✓ |
6 |
if (!ftab_entries) |
210 |
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return 0; |
211 |
|
6 |
remaining -= 3 * ftab_entries; |
212 |
✗✓ |
6 |
if (remaining < 0) |
213 |
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return AVERROR_INVALIDDATA; |
214 |
|
6 |
m->ftab = av_calloc(ftab_entries, sizeof(*m->ftab)); |
215 |
✗✓ |
6 |
if (!m->ftab) |
216 |
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return AVERROR(ENOMEM); |
217 |
|
6 |
m->ftab_entries = ftab_entries; |
218 |
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|
219 |
✓✓ |
12 |
for (i = 0; i < m->ftab_entries; i++) { |
220 |
|
6 |
m->ftab[i].fontID = bytestream_get_be16(&tx3g_ptr); |
221 |
✓✗ |
6 |
if (m->ftab[i].fontID == m->d.fontID) |
222 |
|
6 |
j = i; |
223 |
|
6 |
font_length = bytestream_get_byte(&tx3g_ptr); |
224 |
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|
225 |
|
6 |
remaining -= font_length; |
226 |
✗✓ |
6 |
if (remaining < 0) { |
227 |
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mov_text_cleanup_ftab(m); |
228 |
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return -1; |
229 |
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} |
230 |
|
6 |
m->ftab[i].font = av_malloc(font_length + 1); |
231 |
✗✓ |
6 |
if (!m->ftab[i].font) { |
232 |
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mov_text_cleanup_ftab(m); |
233 |
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return AVERROR(ENOMEM); |
234 |
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} |
235 |
|
6 |
bytestream_get_buffer(&tx3g_ptr, m->ftab[i].font, font_length); |
236 |
|
6 |
m->ftab[i].font[font_length] = '\0'; |
237 |
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} |
238 |
✓✗ |
6 |
if (j >= 0) |
239 |
|
6 |
m->d.font = m->ftab[j].font; |
240 |
|
6 |
return 0; |
241 |
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} |
242 |
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|
243 |
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static int decode_twrp(const uint8_t *tsmb, MovTextContext *m, const AVPacket *avpkt) |
244 |
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{ |
245 |
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m->box_flags |= TWRP_BOX; |
246 |
|
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m->w.wrap_flag = bytestream_get_byte(&tsmb); |
247 |
|
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return 0; |
248 |
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} |
249 |
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|
250 |
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static int decode_hlit(const uint8_t *tsmb, MovTextContext *m, const AVPacket *avpkt) |
251 |
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{ |
252 |
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m->box_flags |= HLIT_BOX; |
253 |
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m->h.hlit_start = bytestream_get_be16(&tsmb); |
254 |
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m->h.hlit_end = bytestream_get_be16(&tsmb); |
255 |
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return 0; |
256 |
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} |
257 |
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258 |
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static int decode_hclr(const uint8_t *tsmb, MovTextContext *m, const AVPacket *avpkt) |
259 |
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{ |
260 |
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m->box_flags |= HCLR_BOX; |
261 |
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bytestream_get_buffer(&tsmb, m->c.hlit_color, 4); |
262 |
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return 0; |
263 |
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} |
264 |
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|
265 |
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static int decode_styl(const uint8_t *tsmb, MovTextContext *m, const AVPacket *avpkt) |
266 |
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{ |
267 |
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int i; |
268 |
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int style_entries = bytestream_get_be16(&tsmb); |
269 |
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StyleBox *tmp; |
270 |
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|
271 |
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// A single style record is of length 12 bytes. |
272 |
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if (m->tracksize + m->size_var + 2 + style_entries * 12 > avpkt->size) |
273 |
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return -1; |
274 |
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|
275 |
|
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tmp = av_realloc_array(m->s, style_entries, sizeof(*m->s)); |
276 |
|
|
if (!tmp) |
277 |
|
|
return AVERROR(ENOMEM); |
278 |
|
|
m->s = tmp; |
279 |
|
|
m->style_entries = style_entries; |
280 |
|
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|
281 |
|
|
m->box_flags |= STYL_BOX; |
282 |
|
|
for(i = 0; i < m->style_entries; i++) { |
283 |
|
|
StyleBox *style = &m->s[i]; |
284 |
|
|
|
285 |
|
|
style->style_start = bytestream_get_be16(&tsmb); |
286 |
|
|
style->style_end = bytestream_get_be16(&tsmb); |
287 |
|
|
if ( style->style_end < style->style_start |
288 |
|
|
|| (i && style->style_start < m->s[i - 1].style_end)) { |
289 |
|
|
mov_text_cleanup(m); |
290 |
|
|
return AVERROR(ENOMEM); |
291 |
|
|
} |
292 |
|
|
if (style->style_start == style->style_end) { |
293 |
|
|
/* Skip this style as it applies to no character */ |
294 |
|
|
tsmb += 8; |
295 |
|
|
m->style_entries--; |
296 |
|
|
i--; |
297 |
|
|
continue; |
298 |
|
|
} |
299 |
|
|
|
300 |
|
|
style->style_fontID = bytestream_get_be16(&tsmb); |
301 |
|
|
style->style_flag = bytestream_get_byte(&tsmb); |
302 |
|
|
style->bold = !!(style->style_flag & STYLE_FLAG_BOLD); |
303 |
|
|
style->italic = !!(style->style_flag & STYLE_FLAG_ITALIC); |
304 |
|
|
style->underline = !!(style->style_flag & STYLE_FLAG_UNDERLINE); |
305 |
|
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style->fontsize = bytestream_get_byte(&tsmb); |
306 |
|
|
style->color = bytestream_get_be24(&tsmb); |
307 |
|
|
style->alpha = bytestream_get_byte(&tsmb); |
308 |
|
|
} |
309 |
|
|
return 0; |
310 |
|
|
} |
311 |
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|
312 |
|
|
static const Box box_types[] = { |
313 |
|
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{ MKBETAG('s','t','y','l'), 2, decode_styl }, |
314 |
|
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{ MKBETAG('h','l','i','t'), 4, decode_hlit }, |
315 |
|
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{ MKBETAG('h','c','l','r'), 4, decode_hclr }, |
316 |
|
|
{ MKBETAG('t','w','r','p'), 1, decode_twrp } |
317 |
|
|
}; |
318 |
|
|
|
319 |
|
|
const static size_t box_count = FF_ARRAY_ELEMS(box_types); |
320 |
|
|
|
321 |
|
|
// Return byte length of the UTF-8 sequence starting at text[0]. 0 on error. |
322 |
|
135 |
static int get_utf8_length_at(const char *text, const char *text_end) |
323 |
|
|
{ |
324 |
|
135 |
const char *start = text; |
325 |
|
135 |
int err = 0; |
326 |
|
|
uint32_t c; |
327 |
✓✗✓✗
✗✓✗✗
✗✗✗✓
|
135 |
GET_UTF8(c, text < text_end ? (uint8_t)*text++ : (err = 1, 0), goto error;); |
328 |
✗✓ |
135 |
if (err) |
329 |
|
|
goto error; |
330 |
|
135 |
return text - start; |
331 |
|
|
error: |
332 |
|
|
return 0; |
333 |
|
|
} |
334 |
|
|
|
335 |
|
9 |
static int text_to_ass(AVBPrint *buf, const char *text, const char *text_end, |
336 |
|
|
AVCodecContext *avctx) |
337 |
|
|
{ |
338 |
|
9 |
MovTextContext *m = avctx->priv_data; |
339 |
|
9 |
int i = 0; |
340 |
|
9 |
int text_pos = 0; |
341 |
|
9 |
int entry = 0; |
342 |
|
9 |
int color = m->d.color; |
343 |
|
|
|
344 |
✓✗✗✓
|
9 |
if (text < text_end && m->box_flags & TWRP_BOX) { |
345 |
|
|
if (m->w.wrap_flag == 1) { |
346 |
|
|
av_bprintf(buf, "{\\q1}"); /* End of line wrap */ |
347 |
|
|
} else { |
348 |
|
|
av_bprintf(buf, "{\\q2}"); /* No wrap */ |
349 |
|
|
} |
350 |
|
|
} |
351 |
|
|
|
352 |
✓✓ |
144 |
while (text < text_end) { |
353 |
|
|
int len; |
354 |
|
|
|
355 |
✗✓✗✗
|
135 |
if ((m->box_flags & STYL_BOX) && entry < m->style_entries) { |
356 |
|
|
const StyleBox *style = &m->s[entry]; |
357 |
|
|
if (text_pos == style->style_end) { |
358 |
|
|
av_bprintf(buf, "{\\r}"); |
359 |
|
|
color = m->d.color; |
360 |
|
|
entry++; |
361 |
|
|
style++; |
362 |
|
|
} |
363 |
|
|
if (entry < m->style_entries && text_pos == style->style_start) { |
364 |
|
|
if (style->bold ^ m->d.bold) |
365 |
|
|
av_bprintf(buf, "{\\b%d}", style->bold); |
366 |
|
|
if (style->italic ^ m->d.italic) |
367 |
|
|
av_bprintf(buf, "{\\i%d}", style->italic); |
368 |
|
|
if (style->underline ^ m->d.underline) |
369 |
|
|
av_bprintf(buf, "{\\u%d}", style->underline); |
370 |
|
|
if (style->fontsize != m->d.fontsize) |
371 |
|
|
av_bprintf(buf, "{\\fs%d}", style->fontsize); |
372 |
|
|
if (style->style_fontID != m->d.fontID) |
373 |
|
|
for (i = 0; i < m->ftab_entries; i++) { |
374 |
|
|
if (style->style_fontID == m->ftab[i].fontID) |
375 |
|
|
av_bprintf(buf, "{\\fn%s}", m->ftab[i].font); |
376 |
|
|
} |
377 |
|
|
if (m->d.color != style->color) { |
378 |
|
|
color = style->color; |
379 |
|
|
av_bprintf(buf, "{\\1c&H%X&}", RGB_TO_BGR(color)); |
380 |
|
|
} |
381 |
|
|
if (m->d.alpha != style->alpha) |
382 |
|
|
av_bprintf(buf, "{\\1a&H%02X&}", 255 - style->alpha); |
383 |
|
|
} |
384 |
|
|
} |
385 |
✗✓ |
135 |
if (m->box_flags & HLIT_BOX) { |
386 |
|
|
if (text_pos == m->h.hlit_start) { |
387 |
|
|
/* If hclr box is present, set the secondary color to the color |
388 |
|
|
* specified. Otherwise, set primary color to white and secondary |
389 |
|
|
* color to black. These colors will come from TextSampleModifier |
390 |
|
|
* boxes in future and inverse video technique for highlight will |
391 |
|
|
* be implemented. |
392 |
|
|
*/ |
393 |
|
|
if (m->box_flags & HCLR_BOX) { |
394 |
|
|
av_bprintf(buf, "{\\2c&H%02x%02x%02x&}", m->c.hlit_color[2], |
395 |
|
|
m->c.hlit_color[1], m->c.hlit_color[0]); |
396 |
|
|
} else { |
397 |
|
|
av_bprintf(buf, "{\\1c&H000000&}{\\2c&HFFFFFF&}"); |
398 |
|
|
} |
399 |
|
|
} |
400 |
|
|
if (text_pos == m->h.hlit_end) { |
401 |
|
|
if (m->box_flags & HCLR_BOX) { |
402 |
|
|
av_bprintf(buf, "{\\2c&H%X&}", RGB_TO_BGR(m->d.color)); |
403 |
|
|
} else { |
404 |
|
|
av_bprintf(buf, "{\\1c&H%X&}{\\2c&H%X&}", |
405 |
|
|
RGB_TO_BGR(color), RGB_TO_BGR(m->d.color)); |
406 |
|
|
} |
407 |
|
|
} |
408 |
|
|
} |
409 |
|
|
|
410 |
|
135 |
len = get_utf8_length_at(text, text_end); |
411 |
✗✓ |
135 |
if (len < 1) { |
412 |
|
|
av_log(avctx, AV_LOG_ERROR, "invalid UTF-8 byte in subtitle\n"); |
413 |
|
|
len = 1; |
414 |
|
|
} |
415 |
✗✓✓ |
135 |
switch (*text) { |
416 |
|
|
case '\r': |
417 |
|
|
break; |
418 |
|
6 |
case '\n': |
419 |
|
6 |
av_bprintf(buf, "\\N"); |
420 |
|
6 |
break; |
421 |
|
129 |
default: |
422 |
|
129 |
av_bprint_append_data(buf, text, len); |
423 |
|
129 |
break; |
424 |
|
|
} |
425 |
|
135 |
text += len; |
426 |
|
135 |
text_pos++; |
427 |
|
|
} |
428 |
|
|
|
429 |
|
9 |
return 0; |
430 |
|
|
} |
431 |
|
|
|
432 |
|
6 |
static int mov_text_init(AVCodecContext *avctx) { |
433 |
|
|
/* |
434 |
|
|
* TODO: Handle the default text style. |
435 |
|
|
* NB: Most players ignore styles completely, with the result that |
436 |
|
|
* it's very common to find files where the default style is broken |
437 |
|
|
* and respecting it results in a worse experience than ignoring it. |
438 |
|
|
*/ |
439 |
|
|
int ret; |
440 |
|
6 |
MovTextContext *m = avctx->priv_data; |
441 |
|
6 |
ret = mov_text_tx3g(avctx, m); |
442 |
✓✗ |
6 |
if (ret == 0) { |
443 |
✗✓✗✗
|
6 |
if (!m->frame_width || !m->frame_height) { |
444 |
|
6 |
m->frame_width = ASS_DEFAULT_PLAYRESX; |
445 |
|
6 |
m->frame_height = ASS_DEFAULT_PLAYRESY; |
446 |
|
|
} |
447 |
|
6 |
return ff_ass_subtitle_header_full(avctx, |
448 |
|
|
m->frame_width, m->frame_height, |
449 |
|
6 |
m->d.font, m->d.fontsize, |
450 |
|
6 |
(255U - m->d.alpha) << 24 | RGB_TO_BGR(m->d.color), |
451 |
|
6 |
(255U - m->d.alpha) << 24 | RGB_TO_BGR(m->d.color), |
452 |
|
6 |
(255U - m->d.back_alpha) << 24 | RGB_TO_BGR(m->d.back_color), |
453 |
|
6 |
(255U - m->d.back_alpha) << 24 | RGB_TO_BGR(m->d.back_color), |
454 |
|
6 |
m->d.bold, m->d.italic, m->d.underline, |
455 |
|
|
ASS_DEFAULT_BORDERSTYLE, m->d.alignment); |
456 |
|
|
} else |
457 |
|
|
return ff_ass_subtitle_header_default(avctx); |
458 |
|
|
} |
459 |
|
|
|
460 |
|
18 |
static int mov_text_decode_frame(AVCodecContext *avctx, |
461 |
|
|
void *data, int *got_sub_ptr, AVPacket *avpkt) |
462 |
|
|
{ |
463 |
|
18 |
AVSubtitle *sub = data; |
464 |
|
18 |
MovTextContext *m = avctx->priv_data; |
465 |
|
|
int ret; |
466 |
|
|
AVBPrint buf; |
467 |
|
18 |
char *ptr = avpkt->data; |
468 |
|
|
char *end; |
469 |
|
|
int text_length, tsmb_type, ret_tsmb; |
470 |
|
|
uint64_t tsmb_size; |
471 |
|
|
const uint8_t *tsmb; |
472 |
|
|
size_t i; |
473 |
|
|
|
474 |
✓✗✗✓
|
18 |
if (!ptr || avpkt->size < 2) |
475 |
|
|
return AVERROR_INVALIDDATA; |
476 |
|
|
|
477 |
|
|
/* |
478 |
|
|
* A packet of size two with value zero is an empty subtitle |
479 |
|
|
* used to mark the end of the previous non-empty subtitle. |
480 |
|
|
* We can just drop them here as we have duration information |
481 |
|
|
* already. If the value is non-zero, then it's technically a |
482 |
|
|
* bad packet. |
483 |
|
|
*/ |
484 |
✓✓ |
18 |
if (avpkt->size == 2) |
485 |
✓✗ |
9 |
return AV_RB16(ptr) == 0 ? 0 : AVERROR_INVALIDDATA; |
486 |
|
|
|
487 |
|
|
/* |
488 |
|
|
* The first two bytes of the packet are the length of the text string |
489 |
|
|
* In complex cases, there are style descriptors appended to the string |
490 |
|
|
* so we can't just assume the packet size is the string size. |
491 |
|
|
*/ |
492 |
|
9 |
text_length = AV_RB16(ptr); |
493 |
✗✓ |
9 |
end = ptr + FFMIN(2 + text_length, avpkt->size); |
494 |
|
9 |
ptr += 2; |
495 |
|
|
|
496 |
|
9 |
mov_text_cleanup(m); |
497 |
|
|
|
498 |
|
9 |
tsmb_size = 0; |
499 |
|
9 |
m->tracksize = 2 + text_length; |
500 |
|
9 |
m->style_entries = 0; |
501 |
|
9 |
m->box_flags = 0; |
502 |
|
|
// Note that the spec recommends lines be no longer than 2048 characters. |
503 |
|
9 |
av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); |
504 |
✗✓ |
9 |
if (text_length + 2 != avpkt->size) { |
505 |
|
|
while (m->tracksize + 8 <= avpkt->size) { |
506 |
|
|
// A box is a minimum of 8 bytes. |
507 |
|
|
tsmb = ptr + m->tracksize - 2; |
508 |
|
|
tsmb_size = AV_RB32(tsmb); |
509 |
|
|
tsmb += 4; |
510 |
|
|
tsmb_type = AV_RB32(tsmb); |
511 |
|
|
tsmb += 4; |
512 |
|
|
|
513 |
|
|
if (tsmb_size == 1) { |
514 |
|
|
if (m->tracksize + 16 > avpkt->size) |
515 |
|
|
break; |
516 |
|
|
tsmb_size = AV_RB64(tsmb); |
517 |
|
|
tsmb += 8; |
518 |
|
|
m->size_var = 16; |
519 |
|
|
} else |
520 |
|
|
m->size_var = 8; |
521 |
|
|
//size_var is equal to 8 or 16 depending on the size of box |
522 |
|
|
|
523 |
|
|
if (tsmb_size == 0) { |
524 |
|
|
av_log(avctx, AV_LOG_ERROR, "tsmb_size is 0\n"); |
525 |
|
|
return AVERROR_INVALIDDATA; |
526 |
|
|
} |
527 |
|
|
|
528 |
|
|
if (tsmb_size > avpkt->size - m->tracksize) |
529 |
|
|
break; |
530 |
|
|
|
531 |
|
|
for (i = 0; i < box_count; i++) { |
532 |
|
|
if (tsmb_type == box_types[i].type) { |
533 |
|
|
if (m->tracksize + m->size_var + box_types[i].base_size > avpkt->size) |
534 |
|
|
break; |
535 |
|
|
ret_tsmb = box_types[i].decode(tsmb, m, avpkt); |
536 |
|
|
if (ret_tsmb == -1) |
537 |
|
|
break; |
538 |
|
|
} |
539 |
|
|
} |
540 |
|
|
m->tracksize = m->tracksize + tsmb_size; |
541 |
|
|
} |
542 |
|
|
text_to_ass(&buf, ptr, end, avctx); |
543 |
|
|
mov_text_cleanup(m); |
544 |
|
|
} else |
545 |
|
9 |
text_to_ass(&buf, ptr, end, avctx); |
546 |
|
|
|
547 |
|
9 |
ret = ff_ass_add_rect(sub, buf.str, m->readorder++, 0, NULL, NULL); |
548 |
|
9 |
av_bprint_finalize(&buf, NULL); |
549 |
✗✓ |
9 |
if (ret < 0) |
550 |
|
|
return ret; |
551 |
|
9 |
*got_sub_ptr = sub->num_rects > 0; |
552 |
|
9 |
return avpkt->size; |
553 |
|
|
} |
554 |
|
|
|
555 |
|
6 |
static int mov_text_decode_close(AVCodecContext *avctx) |
556 |
|
|
{ |
557 |
|
6 |
MovTextContext *m = avctx->priv_data; |
558 |
|
6 |
mov_text_cleanup_ftab(m); |
559 |
|
6 |
mov_text_cleanup(m); |
560 |
|
6 |
return 0; |
561 |
|
|
} |
562 |
|
|
|
563 |
|
|
static void mov_text_flush(AVCodecContext *avctx) |
564 |
|
|
{ |
565 |
|
|
MovTextContext *m = avctx->priv_data; |
566 |
|
|
if (!(avctx->flags2 & AV_CODEC_FLAG2_RO_FLUSH_NOOP)) |
567 |
|
|
m->readorder = 0; |
568 |
|
|
} |
569 |
|
|
|
570 |
|
|
#define OFFSET(x) offsetof(MovTextContext, x) |
571 |
|
|
#define FLAGS AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_SUBTITLE_PARAM |
572 |
|
|
static const AVOption options[] = { |
573 |
|
|
{ "width", "Frame width, usually video width", OFFSET(frame_width), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS }, |
574 |
|
|
{ "height", "Frame height, usually video height", OFFSET(frame_height), AV_OPT_TYPE_INT, {.i64=0}, 0, INT_MAX, FLAGS }, |
575 |
|
|
{ NULL }, |
576 |
|
|
}; |
577 |
|
|
|
578 |
|
|
static const AVClass mov_text_decoder_class = { |
579 |
|
|
.class_name = "MOV text decoder", |
580 |
|
|
.item_name = av_default_item_name, |
581 |
|
|
.option = options, |
582 |
|
|
.version = LIBAVUTIL_VERSION_INT, |
583 |
|
|
}; |
584 |
|
|
|
585 |
|
|
AVCodec ff_movtext_decoder = { |
586 |
|
|
.name = "mov_text", |
587 |
|
|
.long_name = NULL_IF_CONFIG_SMALL("3GPP Timed Text subtitle"), |
588 |
|
|
.type = AVMEDIA_TYPE_SUBTITLE, |
589 |
|
|
.id = AV_CODEC_ID_MOV_TEXT, |
590 |
|
|
.priv_data_size = sizeof(MovTextContext), |
591 |
|
|
.priv_class = &mov_text_decoder_class, |
592 |
|
|
.init = mov_text_init, |
593 |
|
|
.decode = mov_text_decode_frame, |
594 |
|
|
.close = mov_text_decode_close, |
595 |
|
|
.flush = mov_text_flush, |
596 |
|
|
}; |