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1 | /* |
2 | * 4XM codec | |
3 | * Copyright (c) 2003 Michael Niedermayer | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | /** | |
23 | * @file | |
24 | * 4XM codec. | |
25 | */ | |
26 | ||
27 | #include <inttypes.h> | |
28 | ||
29 | #include "libavutil/avassert.h" | |
30 | #include "libavutil/frame.h" | |
31 | #include "libavutil/imgutils.h" | |
32 | #include "libavutil/intreadwrite.h" | |
33 | #include "avcodec.h" | |
34 | #include "blockdsp.h" | |
35 | #include "bswapdsp.h" | |
36 | #include "bytestream.h" | |
37 | #include "get_bits.h" | |
38 | #include "internal.h" | |
39 | ||
40 | ||
41 | #define BLOCK_TYPE_VLC_BITS 5 | |
42 | #define ACDC_VLC_BITS 9 | |
43 | ||
44 | #define CFRAME_BUFFER_COUNT 100 | |
45 | ||
46 | static const uint8_t block_type_tab[2][4][8][2] = { | |
47 | { | |
48 | { // { 8, 4, 2 } x { 8, 4, 2} | |
49 | { 0, 1 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 30, 5 }, { 31, 5 }, { 0, 0 } | |
50 | }, { // { 8, 4 } x 1 | |
51 | { 0, 1 }, { 0, 0 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 15, 4 }, { 0, 0 } | |
52 | }, { // 1 x { 8, 4 } | |
53 | { 0, 1 }, { 2, 2 }, { 0, 0 }, { 6, 3 }, { 14, 4 }, { 15, 4 }, { 0, 0 } | |
54 | }, { // 1 x 2, 2 x 1 | |
55 | { 0, 1 }, { 0, 0 }, { 0, 0 }, { 2, 2 }, { 6, 3 }, { 14, 4 }, { 15, 4 } | |
56 | } | |
57 | }, { | |
58 | { // { 8, 4, 2 } x { 8, 4, 2} | |
59 | { 1, 2 }, { 4, 3 }, { 5, 3 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 } | |
60 | }, {// { 8, 4 } x 1 | |
61 | { 1, 2 }, { 0, 0 }, { 2, 2 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 } | |
62 | }, {// 1 x { 8, 4 } | |
63 | { 1, 2 }, { 2, 2 }, { 0, 0 }, { 0, 2 }, { 6, 3 }, { 7, 3 }, { 0, 0 } | |
64 | }, {// 1 x 2, 2 x 1 | |
65 | { 1, 2 }, { 0, 0 }, { 0, 0 }, { 0, 2 }, { 2, 2 }, { 6, 3 }, { 7, 3 } | |
66 | } | |
67 | } | |
68 | }; | |
69 | ||
70 | static const uint8_t size2index[4][4] = { | |
71 | { -1, 3, 1, 1 }, | |
72 | { 3, 0, 0, 0 }, | |
73 | { 2, 0, 0, 0 }, | |
74 | { 2, 0, 0, 0 }, | |
75 | }; | |
76 | ||
77 | static const int8_t mv[256][2] = { | |
78 | { 0, 0 }, { 0, -1 }, { -1, 0 }, { 1, 0 }, { 0, 1 }, { -1, -1 }, { 1, -1 }, { -1, 1 }, | |
79 | { 1, 1 }, { 0, -2 }, { -2, 0 }, { 2, 0 }, { 0, 2 }, { -1, -2 }, { 1, -2 }, { -2, -1 }, | |
80 | { 2, -1 }, { -2, 1 }, { 2, 1 }, { -1, 2 }, { 1, 2 }, { -2, -2 }, { 2, -2 }, { -2, 2 }, | |
81 | { 2, 2 }, { 0, -3 }, { -3, 0 }, { 3, 0 }, { 0, 3 }, { -1, -3 }, { 1, -3 }, { -3, -1 }, | |
82 | { 3, -1 }, { -3, 1 }, { 3, 1 }, { -1, 3 }, { 1, 3 }, { -2, -3 }, { 2, -3 }, { -3, -2 }, | |
83 | { 3, -2 }, { -3, 2 }, { 3, 2 }, { -2, 3 }, { 2, 3 }, { 0, -4 }, { -4, 0 }, { 4, 0 }, | |
84 | { 0, 4 }, { -1, -4 }, { 1, -4 }, { -4, -1 }, { 4, -1 }, { 4, 1 }, { -1, 4 }, { 1, 4 }, | |
85 | { -3, -3 }, { -3, 3 }, { 3, 3 }, { -2, -4 }, { -4, -2 }, { 4, -2 }, { -4, 2 }, { -2, 4 }, | |
86 | { 2, 4 }, { -3, -4 }, { 3, -4 }, { 4, -3 }, { -5, 0 }, { -4, 3 }, { -3, 4 }, { 3, 4 }, | |
87 | { -1, -5 }, { -5, -1 }, { -5, 1 }, { -1, 5 }, { -2, -5 }, { 2, -5 }, { 5, -2 }, { 5, 2 }, | |
88 | { -4, -4 }, { -4, 4 }, { -3, -5 }, { -5, -3 }, { -5, 3 }, { 3, 5 }, { -6, 0 }, { 0, 6 }, | |
89 | { -6, -1 }, { -6, 1 }, { 1, 6 }, { 2, -6 }, { -6, 2 }, { 2, 6 }, { -5, -4 }, { 5, 4 }, | |
90 | { 4, 5 }, { -6, -3 }, { 6, 3 }, { -7, 0 }, { -1, -7 }, { 5, -5 }, { -7, 1 }, { -1, 7 }, | |
91 | { 4, -6 }, { 6, 4 }, { -2, -7 }, { -7, 2 }, { -3, -7 }, { 7, -3 }, { 3, 7 }, { 6, -5 }, | |
92 | { 0, -8 }, { -1, -8 }, { -7, -4 }, { -8, 1 }, { 4, 7 }, { 2, -8 }, { -2, 8 }, { 6, 6 }, | |
93 | { -8, 3 }, { 5, -7 }, { -5, 7 }, { 8, -4 }, { 0, -9 }, { -9, -1 }, { 1, 9 }, { 7, -6 }, | |
94 | { -7, 6 }, { -5, -8 }, { -5, 8 }, { -9, 3 }, { 9, -4 }, { 7, -7 }, { 8, -6 }, { 6, 8 }, | |
95 | { 10, 1 }, { -10, 2 }, { 9, -5 }, { 10, -3 }, { -8, -7 }, { -10, -4 }, { 6, -9 }, { -11, 0 }, | |
96 | { 11, 1 }, { -11, -2 }, { -2, 11 }, { 7, -9 }, { -7, 9 }, { 10, 6 }, { -4, 11 }, { 8, -9 }, | |
97 | { 8, 9 }, { 5, 11 }, { 7, -10 }, { 12, -3 }, { 11, 6 }, { -9, -9 }, { 8, 10 }, { 5, 12 }, | |
98 | { -11, 7 }, { 13, 2 }, { 6, -12 }, { 10, 9 }, { -11, 8 }, { -7, 12 }, { 0, 14 }, { 14, -2 }, | |
99 | { -9, 11 }, { -6, 13 }, { -14, -4 }, { -5, -14 }, { 5, 14 }, { -15, -1 }, { -14, -6 }, { 3, -15 }, | |
100 | { 11, -11 }, { -7, 14 }, { -5, 15 }, { 8, -14 }, { 15, 6 }, { 3, 16 }, { 7, -15 }, { -16, 5 }, | |
101 | { 0, 17 }, { -16, -6 }, { -10, 14 }, { -16, 7 }, { 12, 13 }, { -16, 8 }, { -17, 6 }, { -18, 3 }, | |
102 | { -7, 17 }, { 15, 11 }, { 16, 10 }, { 2, -19 }, { 3, -19 }, { -11, -16 }, { -18, 8 }, { -19, -6 }, | |
103 | { 2, -20 }, { -17, -11 }, { -10, -18 }, { 8, 19 }, { -21, -1 }, { -20, 7 }, { -4, 21 }, { 21, 5 }, | |
104 | { 15, 16 }, { 2, -22 }, { -10, -20 }, { -22, 5 }, { 20, -11 }, { -7, -22 }, { -12, 20 }, { 23, -5 }, | |
105 | { 13, -20 }, { 24, -2 }, { -15, 19 }, { -11, 22 }, { 16, 19 }, { 23, -10 }, { -18, -18 }, { -9, -24 }, | |
106 | { 24, -10 }, { -3, 26 }, { -23, 13 }, { -18, -20 }, { 17, 21 }, { -4, 27 }, { 27, 6 }, { 1, -28 }, | |
107 | { -11, 26 }, { -17, -23 }, { 7, 28 }, { 11, -27 }, { 29, 5 }, { -23, -19 }, { -28, -11 }, { -21, 22 }, | |
108 | { -30, 7 }, { -17, 26 }, { -27, 16 }, { 13, 29 }, { 19, -26 }, { 10, -31 }, { -14, -30 }, { 20, -27 }, | |
109 | { -29, 18 }, { -16, -31 }, { -28, -22 }, { 21, -30 }, { -25, 28 }, { 26, -29 }, { 25, -32 }, { -32, -32 } | |
110 | }; | |
111 | ||
112 | /* This is simply the scaled down elementwise product of the standard JPEG | |
113 | * quantizer table and the AAN premul table. */ | |
114 | static const uint8_t dequant_table[64] = { | |
115 | 16, 15, 13, 19, 24, 31, 28, 17, | |
116 | 17, 23, 25, 31, 36, 63, 45, 21, | |
117 | 18, 24, 27, 37, 52, 59, 49, 20, | |
118 | 16, 28, 34, 40, 60, 80, 51, 20, | |
119 | 18, 31, 48, 66, 68, 86, 56, 21, | |
120 | 19, 38, 56, 59, 64, 64, 48, 20, | |
121 | 27, 48, 55, 55, 56, 51, 35, 15, | |
122 | 20, 35, 34, 32, 31, 22, 15, 8, | |
123 | }; | |
124 | ||
125 | static VLC block_type_vlc[2][4]; | |
126 | ||
127 | ||
128 | typedef struct CFrameBuffer { | |
129 | unsigned int allocated_size; | |
130 | unsigned int size; | |
131 | int id; | |
132 | uint8_t *data; | |
133 | } CFrameBuffer; | |
134 | ||
135 | typedef struct FourXContext { | |
136 | AVCodecContext *avctx; | |
137 | BlockDSPContext bdsp; | |
138 | BswapDSPContext bbdsp; | |
139 | uint16_t *frame_buffer; | |
140 | uint16_t *last_frame_buffer; | |
141 | GetBitContext pre_gb; ///< ac/dc prefix | |
142 | GetBitContext gb; | |
143 | GetByteContext g; | |
144 | GetByteContext g2; | |
145 | int mv[256]; | |
146 | VLC pre_vlc; | |
147 | int last_dc; | |
148 | DECLARE_ALIGNED(16, int16_t, block)[6][64]; | |
149 | void *bitstream_buffer; | |
150 | unsigned int bitstream_buffer_size; | |
151 | int version; | |
152 | CFrameBuffer cfrm[CFRAME_BUFFER_COUNT]; | |
153 | } FourXContext; | |
154 | ||
155 | ||
156 | #define FIX_1_082392200 70936 | |
157 | #define FIX_1_414213562 92682 | |
158 | #define FIX_1_847759065 121095 | |
159 | #define FIX_2_613125930 171254 | |
160 | ||
161 | #define MULTIPLY(var, const) (((var) * (const)) >> 16) | |
162 | ||
163 | static void idct(int16_t block[64]) | |
164 | { | |
165 | int tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7; | |
166 | int tmp10, tmp11, tmp12, tmp13; | |
167 | int z5, z10, z11, z12, z13; | |
168 | int i; | |
169 | int temp[64]; | |
170 | ||
171 | for (i = 0; i < 8; i++) { | |
172 | tmp10 = block[8 * 0 + i] + block[8 * 4 + i]; | |
173 | tmp11 = block[8 * 0 + i] - block[8 * 4 + i]; | |
174 | ||
175 | tmp13 = block[8 * 2 + i] + block[8 * 6 + i]; | |
176 | tmp12 = MULTIPLY(block[8 * 2 + i] - block[8 * 6 + i], FIX_1_414213562) - tmp13; | |
177 | ||
178 | tmp0 = tmp10 + tmp13; | |
179 | tmp3 = tmp10 - tmp13; | |
180 | tmp1 = tmp11 + tmp12; | |
181 | tmp2 = tmp11 - tmp12; | |
182 | ||
183 | z13 = block[8 * 5 + i] + block[8 * 3 + i]; | |
184 | z10 = block[8 * 5 + i] - block[8 * 3 + i]; | |
185 | z11 = block[8 * 1 + i] + block[8 * 7 + i]; | |
186 | z12 = block[8 * 1 + i] - block[8 * 7 + i]; | |
187 | ||
188 | tmp7 = z11 + z13; | |
189 | tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); | |
190 | ||
191 | z5 = MULTIPLY(z10 + z12, FIX_1_847759065); | |
192 | tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5; | |
193 | tmp12 = MULTIPLY(z10, -FIX_2_613125930) + z5; | |
194 | ||
195 | tmp6 = tmp12 - tmp7; | |
196 | tmp5 = tmp11 - tmp6; | |
197 | tmp4 = tmp10 + tmp5; | |
198 | ||
199 | temp[8 * 0 + i] = tmp0 + tmp7; | |
200 | temp[8 * 7 + i] = tmp0 - tmp7; | |
201 | temp[8 * 1 + i] = tmp1 + tmp6; | |
202 | temp[8 * 6 + i] = tmp1 - tmp6; | |
203 | temp[8 * 2 + i] = tmp2 + tmp5; | |
204 | temp[8 * 5 + i] = tmp2 - tmp5; | |
205 | temp[8 * 4 + i] = tmp3 + tmp4; | |
206 | temp[8 * 3 + i] = tmp3 - tmp4; | |
207 | } | |
208 | ||
209 | for (i = 0; i < 8 * 8; i += 8) { | |
210 | tmp10 = temp[0 + i] + temp[4 + i]; | |
211 | tmp11 = temp[0 + i] - temp[4 + i]; | |
212 | ||
213 | tmp13 = temp[2 + i] + temp[6 + i]; | |
214 | tmp12 = MULTIPLY(temp[2 + i] - temp[6 + i], FIX_1_414213562) - tmp13; | |
215 | ||
216 | tmp0 = tmp10 + tmp13; | |
217 | tmp3 = tmp10 - tmp13; | |
218 | tmp1 = tmp11 + tmp12; | |
219 | tmp2 = tmp11 - tmp12; | |
220 | ||
221 | z13 = temp[5 + i] + temp[3 + i]; | |
222 | z10 = temp[5 + i] - temp[3 + i]; | |
223 | z11 = temp[1 + i] + temp[7 + i]; | |
224 | z12 = temp[1 + i] - temp[7 + i]; | |
225 | ||
226 | tmp7 = z11 + z13; | |
227 | tmp11 = MULTIPLY(z11 - z13, FIX_1_414213562); | |
228 | ||
229 | z5 = MULTIPLY(z10 + z12, FIX_1_847759065); | |
230 | tmp10 = MULTIPLY(z12, FIX_1_082392200) - z5; | |
231 | tmp12 = MULTIPLY(z10, -FIX_2_613125930) + z5; | |
232 | ||
233 | tmp6 = tmp12 - tmp7; | |
234 | tmp5 = tmp11 - tmp6; | |
235 | tmp4 = tmp10 + tmp5; | |
236 | ||
237 | block[0 + i] = (tmp0 + tmp7) >> 6; | |
238 | block[7 + i] = (tmp0 - tmp7) >> 6; | |
239 | block[1 + i] = (tmp1 + tmp6) >> 6; | |
240 | block[6 + i] = (tmp1 - tmp6) >> 6; | |
241 | block[2 + i] = (tmp2 + tmp5) >> 6; | |
242 | block[5 + i] = (tmp2 - tmp5) >> 6; | |
243 | block[4 + i] = (tmp3 + tmp4) >> 6; | |
244 | block[3 + i] = (tmp3 - tmp4) >> 6; | |
245 | } | |
246 | } | |
247 | ||
248 | static av_cold void init_vlcs(FourXContext *f) | |
249 | { | |
250 | static VLC_TYPE table[2][4][32][2]; | |
251 | int i, j; | |
252 | ||
253 | for (i = 0; i < 2; i++) { | |
254 | for (j = 0; j < 4; j++) { | |
255 | block_type_vlc[i][j].table = table[i][j]; | |
256 | block_type_vlc[i][j].table_allocated = 32; | |
257 | init_vlc(&block_type_vlc[i][j], BLOCK_TYPE_VLC_BITS, 7, | |
258 | &block_type_tab[i][j][0][1], 2, 1, | |
259 | &block_type_tab[i][j][0][0], 2, 1, | |
260 | INIT_VLC_USE_NEW_STATIC); | |
261 | } | |
262 | } | |
263 | } | |
264 | ||
265 | static void init_mv(FourXContext *f, int linesize) | |
266 | { | |
267 | int i; | |
268 | ||
269 | for (i = 0; i < 256; i++) { | |
270 | if (f->version > 1) | |
271 | f->mv[i] = mv[i][0] + mv[i][1] * linesize / 2; | |
272 | else | |
273 | f->mv[i] = (i & 15) - 8 + ((i >> 4) - 8) * linesize / 2; | |
274 | } | |
275 | } | |
276 | ||
277 | #if HAVE_BIGENDIAN | |
278 | #define LE_CENTRIC_MUL(dst, src, scale, dc) \ | |
279 | { \ | |
280 | unsigned tmpval = AV_RN32(src); \ | |
281 | tmpval = (tmpval << 16) | (tmpval >> 16); \ | |
282 | tmpval = tmpval * (scale) + (dc); \ | |
283 | tmpval = (tmpval << 16) | (tmpval >> 16); \ | |
284 | AV_WN32A(dst, tmpval); \ | |
285 | } | |
286 | #else | |
287 | #define LE_CENTRIC_MUL(dst, src, scale, dc) \ | |
288 | { \ | |
289 | unsigned tmpval = AV_RN32(src) * (scale) + (dc); \ | |
290 | AV_WN32A(dst, tmpval); \ | |
291 | } | |
292 | #endif | |
293 | ||
294 | static inline void mcdc(uint16_t *dst, const uint16_t *src, int log2w, | |
295 | int h, int stride, int scale, unsigned dc) | |
296 | { | |
297 | int i; | |
298 | dc *= 0x10001; | |
299 | ||
300 | switch (log2w) { | |
301 | case 0: | |
302 | for (i = 0; i < h; i++) { | |
303 | dst[0] = scale * src[0] + dc; | |
304 | if (scale) | |
305 | src += stride; | |
306 | dst += stride; | |
307 | } | |
308 | break; | |
309 | case 1: | |
310 | for (i = 0; i < h; i++) { | |
311 | LE_CENTRIC_MUL(dst, src, scale, dc); | |
312 | if (scale) | |
313 | src += stride; | |
314 | dst += stride; | |
315 | } | |
316 | break; | |
317 | case 2: | |
318 | for (i = 0; i < h; i++) { | |
319 | LE_CENTRIC_MUL(dst, src, scale, dc); | |
320 | LE_CENTRIC_MUL(dst + 2, src + 2, scale, dc); | |
321 | if (scale) | |
322 | src += stride; | |
323 | dst += stride; | |
324 | } | |
325 | break; | |
326 | case 3: | |
327 | for (i = 0; i < h; i++) { | |
328 | LE_CENTRIC_MUL(dst, src, scale, dc); | |
329 | LE_CENTRIC_MUL(dst + 2, src + 2, scale, dc); | |
330 | LE_CENTRIC_MUL(dst + 4, src + 4, scale, dc); | |
331 | LE_CENTRIC_MUL(dst + 6, src + 6, scale, dc); | |
332 | if (scale) | |
333 | src += stride; | |
334 | dst += stride; | |
335 | } | |
336 | break; | |
337 | default: | |
338 | av_assert0(0); | |
339 | } | |
340 | } | |
341 | ||
f6fa7814 | 342 | static int decode_p_block(FourXContext *f, uint16_t *dst, const uint16_t *src, |
2ba45a60 DM |
343 | int log2w, int log2h, int stride) |
344 | { | |
f6fa7814 DM |
345 | int index, h, code, ret, scale = 1; |
346 | uint16_t *start, *end; | |
2ba45a60 DM |
347 | unsigned dc = 0; |
348 | ||
f6fa7814 DM |
349 | av_assert0(log2w >= 0 && log2h >= 0); |
350 | ||
351 | index = size2index[log2h][log2w]; | |
352 | av_assert0(index >= 0); | |
353 | ||
354 | h = 1 << log2h; | |
355 | code = get_vlc2(&f->gb, block_type_vlc[1 - (f->version > 1)][index].table, | |
356 | BLOCK_TYPE_VLC_BITS, 1); | |
357 | av_assert0(code >= 0 && code <= 6); | |
358 | ||
359 | start = f->last_frame_buffer; | |
360 | end = start + stride * (f->avctx->height - h + 1) - (1 << log2w); | |
2ba45a60 DM |
361 | |
362 | if (code == 1) { | |
363 | log2h--; | |
364 | if ((ret = decode_p_block(f, dst, src, log2w, log2h, stride)) < 0) | |
365 | return ret; | |
366 | return decode_p_block(f, dst + (stride << log2h), | |
367 | src + (stride << log2h), | |
368 | log2w, log2h, stride); | |
369 | } else if (code == 2) { | |
370 | log2w--; | |
371 | if ((ret = decode_p_block(f, dst , src, log2w, log2h, stride)) < 0) | |
372 | return ret; | |
373 | return decode_p_block(f, dst + (1 << log2w), | |
374 | src + (1 << log2w), | |
375 | log2w, log2h, stride); | |
376 | } else if (code == 6) { | |
377 | if (bytestream2_get_bytes_left(&f->g2) < 4) { | |
378 | av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n"); | |
379 | return AVERROR_INVALIDDATA; | |
380 | } | |
381 | if (log2w) { | |
382 | dst[0] = bytestream2_get_le16u(&f->g2); | |
383 | dst[1] = bytestream2_get_le16u(&f->g2); | |
384 | } else { | |
385 | dst[0] = bytestream2_get_le16u(&f->g2); | |
386 | dst[stride] = bytestream2_get_le16u(&f->g2); | |
387 | } | |
388 | return 0; | |
389 | } | |
390 | ||
391 | if ((code&3)==0 && bytestream2_get_bytes_left(&f->g) < 1) { | |
392 | av_log(f->avctx, AV_LOG_ERROR, "bytestream overread\n"); | |
393 | return AVERROR_INVALIDDATA; | |
394 | } | |
395 | ||
396 | if (code == 0) { | |
397 | src += f->mv[bytestream2_get_byte(&f->g)]; | |
398 | } else if (code == 3 && f->version >= 2) { | |
399 | return 0; | |
400 | } else if (code == 4) { | |
401 | src += f->mv[bytestream2_get_byte(&f->g)]; | |
402 | if (bytestream2_get_bytes_left(&f->g2) < 2){ | |
403 | av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n"); | |
404 | return AVERROR_INVALIDDATA; | |
405 | } | |
406 | dc = bytestream2_get_le16(&f->g2); | |
407 | } else if (code == 5) { | |
408 | if (bytestream2_get_bytes_left(&f->g2) < 2){ | |
409 | av_log(f->avctx, AV_LOG_ERROR, "wordstream overread\n"); | |
410 | return AVERROR_INVALIDDATA; | |
411 | } | |
412 | av_assert0(start <= src && src <= end); | |
413 | scale = 0; | |
414 | dc = bytestream2_get_le16(&f->g2); | |
415 | } | |
416 | ||
417 | if (start > src || src > end) { | |
418 | av_log(f->avctx, AV_LOG_ERROR, "mv out of pic\n"); | |
419 | return AVERROR_INVALIDDATA; | |
420 | } | |
421 | ||
422 | mcdc(dst, src, log2w, h, stride, scale, dc); | |
423 | ||
424 | return 0; | |
425 | } | |
426 | ||
427 | static int decode_p_frame(FourXContext *f, const uint8_t *buf, int length) | |
428 | { | |
429 | int x, y; | |
430 | const int width = f->avctx->width; | |
431 | const int height = f->avctx->height; | |
432 | uint16_t *dst = f->frame_buffer; | |
433 | uint16_t *src; | |
434 | unsigned int bitstream_size, bytestream_size, wordstream_size, extra, | |
435 | bytestream_offset, wordstream_offset; | |
436 | int ret; | |
437 | ||
438 | src = f->last_frame_buffer; | |
439 | ||
440 | if (f->version > 1) { | |
441 | extra = 20; | |
442 | if (length < extra) | |
443 | return AVERROR_INVALIDDATA; | |
444 | bitstream_size = AV_RL32(buf + 8); | |
445 | wordstream_size = AV_RL32(buf + 12); | |
446 | bytestream_size = AV_RL32(buf + 16); | |
447 | } else { | |
448 | extra = 0; | |
449 | bitstream_size = AV_RL16(buf - 4); | |
450 | wordstream_size = AV_RL16(buf - 2); | |
451 | bytestream_size = FFMAX(length - bitstream_size - wordstream_size, 0); | |
452 | } | |
453 | ||
454 | if (bitstream_size > length || bitstream_size >= INT_MAX/8 || | |
455 | bytestream_size > length - bitstream_size || | |
456 | wordstream_size > length - bytestream_size - bitstream_size || | |
457 | extra > length - bytestream_size - bitstream_size - wordstream_size) { | |
458 | av_log(f->avctx, AV_LOG_ERROR, "lengths %d %d %d %d\n", bitstream_size, bytestream_size, wordstream_size, | |
459 | bitstream_size+ bytestream_size+ wordstream_size - length); | |
460 | return AVERROR_INVALIDDATA; | |
461 | } | |
462 | ||
463 | av_fast_padded_malloc(&f->bitstream_buffer, &f->bitstream_buffer_size, | |
464 | bitstream_size); | |
465 | if (!f->bitstream_buffer) | |
466 | return AVERROR(ENOMEM); | |
467 | f->bbdsp.bswap_buf(f->bitstream_buffer, (const uint32_t *) (buf + extra), | |
468 | bitstream_size / 4); | |
469 | init_get_bits(&f->gb, f->bitstream_buffer, 8 * bitstream_size); | |
470 | ||
471 | wordstream_offset = extra + bitstream_size; | |
472 | bytestream_offset = extra + bitstream_size + wordstream_size; | |
473 | bytestream2_init(&f->g2, buf + wordstream_offset, | |
474 | length - wordstream_offset); | |
475 | bytestream2_init(&f->g, buf + bytestream_offset, | |
476 | length - bytestream_offset); | |
477 | ||
478 | init_mv(f, width * 2); | |
479 | ||
480 | for (y = 0; y < height; y += 8) { | |
481 | for (x = 0; x < width; x += 8) | |
482 | if ((ret = decode_p_block(f, dst + x, src + x, 3, 3, width)) < 0) | |
483 | return ret; | |
484 | src += 8 * width; | |
485 | dst += 8 * width; | |
486 | } | |
487 | ||
488 | return 0; | |
489 | } | |
490 | ||
491 | /** | |
492 | * decode block and dequantize. | |
493 | * Note this is almost identical to MJPEG. | |
494 | */ | |
495 | static int decode_i_block(FourXContext *f, int16_t *block) | |
496 | { | |
497 | int code, i, j, level, val; | |
498 | ||
499 | if (get_bits_left(&f->gb) < 2){ | |
500 | av_log(f->avctx, AV_LOG_ERROR, "%d bits left before decode_i_block()\n", get_bits_left(&f->gb)); | |
501 | return -1; | |
502 | } | |
503 | ||
504 | /* DC coef */ | |
505 | val = get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3); | |
506 | if (val >> 4) { | |
507 | av_log(f->avctx, AV_LOG_ERROR, "error dc run != 0\n"); | |
508 | return AVERROR_INVALIDDATA; | |
509 | } | |
510 | ||
511 | if (val) | |
512 | val = get_xbits(&f->gb, val); | |
513 | ||
514 | val = val * dequant_table[0] + f->last_dc; | |
515 | f->last_dc = block[0] = val; | |
516 | /* AC coefs */ | |
517 | i = 1; | |
518 | for (;;) { | |
519 | code = get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3); | |
520 | ||
521 | /* EOB */ | |
522 | if (code == 0) | |
523 | break; | |
524 | if (code == 0xf0) { | |
525 | i += 16; | |
526 | } else { | |
527 | if (code & 0xf) { | |
528 | level = get_xbits(&f->gb, code & 0xf); | |
529 | } else { | |
530 | av_log(f->avctx, AV_LOG_ERROR, "0 coeff\n"); | |
531 | return AVERROR_INVALIDDATA; | |
532 | } | |
533 | i += code >> 4; | |
534 | if (i >= 64) { | |
535 | av_log(f->avctx, AV_LOG_ERROR, "run %d oveflow\n", i); | |
536 | return 0; | |
537 | } | |
538 | ||
539 | j = ff_zigzag_direct[i]; | |
540 | block[j] = level * dequant_table[j]; | |
541 | i++; | |
542 | if (i >= 64) | |
543 | break; | |
544 | } | |
545 | } | |
546 | ||
547 | return 0; | |
548 | } | |
549 | ||
550 | static inline void idct_put(FourXContext *f, int x, int y) | |
551 | { | |
552 | int16_t (*block)[64] = f->block; | |
553 | int stride = f->avctx->width; | |
554 | int i; | |
555 | uint16_t *dst = f->frame_buffer + y * stride + x; | |
556 | ||
557 | for (i = 0; i < 4; i++) { | |
558 | block[i][0] += 0x80 * 8 * 8; | |
559 | idct(block[i]); | |
560 | } | |
561 | ||
562 | if (!(f->avctx->flags & CODEC_FLAG_GRAY)) { | |
563 | for (i = 4; i < 6; i++) | |
564 | idct(block[i]); | |
565 | } | |
566 | ||
567 | /* Note transform is: | |
568 | * y = ( 1b + 4g + 2r) / 14 | |
569 | * cb = ( 3b - 2g - 1r) / 14 | |
570 | * cr = (-1b - 4g + 5r) / 14 */ | |
571 | for (y = 0; y < 8; y++) { | |
572 | for (x = 0; x < 8; x++) { | |
573 | int16_t *temp = block[(x >> 2) + 2 * (y >> 2)] + | |
574 | 2 * (x & 3) + 2 * 8 * (y & 3); // FIXME optimize | |
575 | int cb = block[4][x + 8 * y]; | |
576 | int cr = block[5][x + 8 * y]; | |
577 | int cg = (cb + cr) >> 1; | |
578 | int y; | |
579 | ||
580 | cb += cb; | |
581 | ||
582 | y = temp[0]; | |
583 | dst[0] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8); | |
584 | y = temp[1]; | |
585 | dst[1] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8); | |
586 | y = temp[8]; | |
587 | dst[stride] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8); | |
588 | y = temp[9]; | |
589 | dst[1 + stride] = ((y + cb) >> 3) + (((y - cg) & 0xFC) << 3) + (((y + cr) & 0xF8) << 8); | |
590 | dst += 2; | |
591 | } | |
592 | dst += 2 * stride - 2 * 8; | |
593 | } | |
594 | } | |
595 | ||
596 | static int decode_i_mb(FourXContext *f) | |
597 | { | |
598 | int ret; | |
599 | int i; | |
600 | ||
601 | f->bdsp.clear_blocks(f->block[0]); | |
602 | ||
603 | for (i = 0; i < 6; i++) | |
604 | if ((ret = decode_i_block(f, f->block[i])) < 0) | |
605 | return ret; | |
606 | ||
607 | return 0; | |
608 | } | |
609 | ||
610 | static const uint8_t *read_huffman_tables(FourXContext *f, | |
611 | const uint8_t * const buf, | |
612 | int buf_size) | |
613 | { | |
614 | int frequency[512] = { 0 }; | |
615 | uint8_t flag[512]; | |
616 | int up[512]; | |
617 | uint8_t len_tab[257]; | |
618 | int bits_tab[257]; | |
619 | int start, end; | |
620 | const uint8_t *ptr = buf; | |
621 | const uint8_t *ptr_end = buf + buf_size; | |
622 | int j; | |
623 | ||
624 | memset(up, -1, sizeof(up)); | |
625 | ||
626 | start = *ptr++; | |
627 | end = *ptr++; | |
628 | for (;;) { | |
629 | int i; | |
630 | ||
631 | if (ptr_end - ptr < FFMAX(end - start + 1, 0) + 1) { | |
632 | av_log(f->avctx, AV_LOG_ERROR, "invalid data in read_huffman_tables\n"); | |
633 | return NULL; | |
634 | } | |
635 | ||
636 | for (i = start; i <= end; i++) | |
637 | frequency[i] = *ptr++; | |
638 | start = *ptr++; | |
639 | if (start == 0) | |
640 | break; | |
641 | ||
642 | end = *ptr++; | |
643 | } | |
644 | frequency[256] = 1; | |
645 | ||
646 | while ((ptr - buf) & 3) | |
647 | ptr++; // 4byte align | |
648 | ||
649 | if (ptr > ptr_end) { | |
650 | av_log(f->avctx, AV_LOG_ERROR, "ptr overflow in read_huffman_tables\n"); | |
651 | return NULL; | |
652 | } | |
653 | ||
654 | for (j = 257; j < 512; j++) { | |
655 | int min_freq[2] = { 256 * 256, 256 * 256 }; | |
656 | int smallest[2] = { 0, 0 }; | |
657 | int i; | |
658 | for (i = 0; i < j; i++) { | |
659 | if (frequency[i] == 0) | |
660 | continue; | |
661 | if (frequency[i] < min_freq[1]) { | |
662 | if (frequency[i] < min_freq[0]) { | |
663 | min_freq[1] = min_freq[0]; | |
664 | smallest[1] = smallest[0]; | |
665 | min_freq[0] = frequency[i]; | |
666 | smallest[0] = i; | |
667 | } else { | |
668 | min_freq[1] = frequency[i]; | |
669 | smallest[1] = i; | |
670 | } | |
671 | } | |
672 | } | |
673 | if (min_freq[1] == 256 * 256) | |
674 | break; | |
675 | ||
676 | frequency[j] = min_freq[0] + min_freq[1]; | |
677 | flag[smallest[0]] = 0; | |
678 | flag[smallest[1]] = 1; | |
679 | up[smallest[0]] = | |
680 | up[smallest[1]] = j; | |
681 | frequency[smallest[0]] = frequency[smallest[1]] = 0; | |
682 | } | |
683 | ||
684 | for (j = 0; j < 257; j++) { | |
685 | int node, len = 0, bits = 0; | |
686 | ||
687 | for (node = j; up[node] != -1; node = up[node]) { | |
688 | bits += flag[node] << len; | |
689 | len++; | |
690 | if (len > 31) | |
691 | // can this happen at all ? | |
692 | av_log(f->avctx, AV_LOG_ERROR, | |
693 | "vlc length overflow\n"); | |
694 | } | |
695 | ||
696 | bits_tab[j] = bits; | |
697 | len_tab[j] = len; | |
698 | } | |
699 | ||
700 | if (init_vlc(&f->pre_vlc, ACDC_VLC_BITS, 257, len_tab, 1, 1, | |
701 | bits_tab, 4, 4, 0)) | |
702 | return NULL; | |
703 | ||
704 | return ptr; | |
705 | } | |
706 | ||
707 | static int mix(int c0, int c1) | |
708 | { | |
709 | int blue = 2 * (c0 & 0x001F) + (c1 & 0x001F); | |
710 | int green = (2 * (c0 & 0x03E0) + (c1 & 0x03E0)) >> 5; | |
711 | int red = 2 * (c0 >> 10) + (c1 >> 10); | |
712 | return red / 3 * 1024 + green / 3 * 32 + blue / 3; | |
713 | } | |
714 | ||
715 | static int decode_i2_frame(FourXContext *f, const uint8_t *buf, int length) | |
716 | { | |
717 | int x, y, x2, y2; | |
718 | const int width = f->avctx->width; | |
719 | const int height = f->avctx->height; | |
720 | const int mbs = (FFALIGN(width, 16) >> 4) * (FFALIGN(height, 16) >> 4); | |
721 | uint16_t *dst = f->frame_buffer; | |
722 | const uint8_t *buf_end = buf + length; | |
723 | GetByteContext g3; | |
724 | ||
725 | if (length < mbs * 8) { | |
726 | av_log(f->avctx, AV_LOG_ERROR, "packet size too small\n"); | |
727 | return AVERROR_INVALIDDATA; | |
728 | } | |
729 | bytestream2_init(&g3, buf, length); | |
730 | ||
731 | for (y = 0; y < height; y += 16) { | |
732 | for (x = 0; x < width; x += 16) { | |
733 | unsigned int color[4] = { 0 }, bits; | |
734 | if (buf_end - buf < 8) | |
735 | return -1; | |
736 | // warning following is purely guessed ... | |
737 | color[0] = bytestream2_get_le16u(&g3); | |
738 | color[1] = bytestream2_get_le16u(&g3); | |
739 | ||
740 | if (color[0] & 0x8000) | |
741 | av_log(f->avctx, AV_LOG_ERROR, "unk bit 1\n"); | |
742 | if (color[1] & 0x8000) | |
743 | av_log(f->avctx, AV_LOG_ERROR, "unk bit 2\n"); | |
744 | ||
745 | color[2] = mix(color[0], color[1]); | |
746 | color[3] = mix(color[1], color[0]); | |
747 | ||
748 | bits = bytestream2_get_le32u(&g3); | |
749 | for (y2 = 0; y2 < 16; y2++) { | |
750 | for (x2 = 0; x2 < 16; x2++) { | |
751 | int index = 2 * (x2 >> 2) + 8 * (y2 >> 2); | |
752 | dst[y2 * width + x2] = color[(bits >> index) & 3]; | |
753 | } | |
754 | } | |
755 | dst += 16; | |
756 | } | |
757 | dst += 16 * width - x; | |
758 | } | |
759 | ||
760 | return 0; | |
761 | } | |
762 | ||
763 | static int decode_i_frame(FourXContext *f, const uint8_t *buf, int length) | |
764 | { | |
765 | int x, y, ret; | |
766 | const int width = f->avctx->width; | |
767 | const int height = f->avctx->height; | |
768 | const unsigned int bitstream_size = AV_RL32(buf); | |
769 | unsigned int prestream_size; | |
770 | const uint8_t *prestream; | |
771 | ||
772 | if (bitstream_size > (1 << 26)) | |
773 | return AVERROR_INVALIDDATA; | |
774 | ||
775 | if (length < bitstream_size + 12) { | |
776 | av_log(f->avctx, AV_LOG_ERROR, "packet size too small\n"); | |
777 | return AVERROR_INVALIDDATA; | |
778 | } | |
779 | ||
780 | prestream_size = 4 * AV_RL32(buf + bitstream_size + 4); | |
781 | prestream = buf + bitstream_size + 12; | |
782 | ||
783 | if (prestream_size + bitstream_size + 12 != length | |
784 | || prestream_size > (1 << 26)) { | |
785 | av_log(f->avctx, AV_LOG_ERROR, "size mismatch %d %d %d\n", | |
786 | prestream_size, bitstream_size, length); | |
787 | return AVERROR_INVALIDDATA; | |
788 | } | |
789 | ||
790 | prestream = read_huffman_tables(f, prestream, prestream_size); | |
791 | if (!prestream) { | |
792 | av_log(f->avctx, AV_LOG_ERROR, "Error reading Huffman tables.\n"); | |
793 | return AVERROR_INVALIDDATA; | |
794 | } | |
795 | ||
796 | av_assert0(prestream <= buf + length); | |
797 | ||
798 | init_get_bits(&f->gb, buf + 4, 8 * bitstream_size); | |
799 | ||
800 | prestream_size = length + buf - prestream; | |
801 | ||
802 | av_fast_padded_malloc(&f->bitstream_buffer, &f->bitstream_buffer_size, | |
803 | prestream_size); | |
804 | if (!f->bitstream_buffer) | |
805 | return AVERROR(ENOMEM); | |
806 | f->bbdsp.bswap_buf(f->bitstream_buffer, (const uint32_t *) prestream, | |
807 | prestream_size / 4); | |
808 | init_get_bits(&f->pre_gb, f->bitstream_buffer, 8 * prestream_size); | |
809 | ||
810 | f->last_dc = 0 * 128 * 8 * 8; | |
811 | ||
812 | for (y = 0; y < height; y += 16) { | |
813 | for (x = 0; x < width; x += 16) { | |
814 | if ((ret = decode_i_mb(f)) < 0) | |
815 | return ret; | |
816 | ||
817 | idct_put(f, x, y); | |
818 | } | |
819 | } | |
820 | ||
821 | if (get_vlc2(&f->pre_gb, f->pre_vlc.table, ACDC_VLC_BITS, 3) != 256) | |
822 | av_log(f->avctx, AV_LOG_ERROR, "end mismatch\n"); | |
823 | ||
824 | return 0; | |
825 | } | |
826 | ||
827 | static int decode_frame(AVCodecContext *avctx, void *data, | |
828 | int *got_frame, AVPacket *avpkt) | |
829 | { | |
830 | const uint8_t *buf = avpkt->data; | |
831 | int buf_size = avpkt->size; | |
832 | FourXContext *const f = avctx->priv_data; | |
833 | AVFrame *picture = data; | |
834 | int i, frame_4cc, frame_size, ret; | |
835 | ||
836 | if (buf_size < 20) | |
837 | return AVERROR_INVALIDDATA; | |
838 | ||
839 | av_assert0(avctx->width % 16 == 0 && avctx->height % 16 == 0); | |
840 | ||
841 | if (buf_size < AV_RL32(buf + 4) + 8) { | |
842 | av_log(f->avctx, AV_LOG_ERROR, "size mismatch %d %"PRIu32"\n", | |
843 | buf_size, AV_RL32(buf + 4)); | |
844 | return AVERROR_INVALIDDATA; | |
845 | } | |
846 | ||
847 | frame_4cc = AV_RL32(buf); | |
848 | ||
849 | if (frame_4cc == AV_RL32("cfrm")) { | |
850 | int free_index = -1; | |
851 | int id, whole_size; | |
852 | const int data_size = buf_size - 20; | |
853 | CFrameBuffer *cfrm; | |
854 | ||
855 | if (f->version <= 1) { | |
856 | av_log(f->avctx, AV_LOG_ERROR, "cfrm in version %d\n", f->version); | |
857 | return AVERROR_INVALIDDATA; | |
858 | } | |
859 | ||
860 | id = AV_RL32(buf + 12); | |
861 | whole_size = AV_RL32(buf + 16); | |
862 | ||
863 | if (data_size < 0 || whole_size < 0) { | |
864 | av_log(f->avctx, AV_LOG_ERROR, "sizes invalid\n"); | |
865 | return AVERROR_INVALIDDATA; | |
866 | } | |
867 | ||
868 | for (i = 0; i < CFRAME_BUFFER_COUNT; i++) | |
869 | if (f->cfrm[i].id && f->cfrm[i].id < avctx->frame_number) | |
870 | av_log(f->avctx, AV_LOG_ERROR, "lost c frame %d\n", | |
871 | f->cfrm[i].id); | |
872 | ||
873 | for (i = 0; i < CFRAME_BUFFER_COUNT; i++) { | |
874 | if (f->cfrm[i].id == id) | |
875 | break; | |
876 | if (f->cfrm[i].size == 0) | |
877 | free_index = i; | |
878 | } | |
879 | ||
880 | if (i >= CFRAME_BUFFER_COUNT) { | |
881 | i = free_index; | |
882 | f->cfrm[i].id = id; | |
883 | } | |
884 | cfrm = &f->cfrm[i]; | |
885 | ||
886 | if (data_size > UINT_MAX - cfrm->size - FF_INPUT_BUFFER_PADDING_SIZE) | |
887 | return AVERROR_INVALIDDATA; | |
888 | ||
889 | cfrm->data = av_fast_realloc(cfrm->data, &cfrm->allocated_size, | |
890 | cfrm->size + data_size + FF_INPUT_BUFFER_PADDING_SIZE); | |
891 | // explicit check needed as memcpy below might not catch a NULL | |
892 | if (!cfrm->data) { | |
893 | av_log(f->avctx, AV_LOG_ERROR, "realloc failure\n"); | |
894 | return AVERROR(ENOMEM); | |
895 | } | |
896 | ||
897 | memcpy(cfrm->data + cfrm->size, buf + 20, data_size); | |
898 | cfrm->size += data_size; | |
899 | ||
900 | if (cfrm->size >= whole_size) { | |
901 | buf = cfrm->data; | |
902 | frame_size = cfrm->size; | |
903 | ||
904 | if (id != avctx->frame_number) | |
905 | av_log(f->avctx, AV_LOG_ERROR, "cframe id mismatch %d %d\n", | |
906 | id, avctx->frame_number); | |
907 | ||
908 | if (f->version <= 1) | |
909 | return AVERROR_INVALIDDATA; | |
910 | ||
911 | cfrm->size = cfrm->id = 0; | |
912 | frame_4cc = AV_RL32("pfrm"); | |
913 | } else | |
914 | return buf_size; | |
915 | } else { | |
916 | buf = buf + 12; | |
917 | frame_size = buf_size - 12; | |
918 | } | |
919 | ||
920 | if ((ret = ff_get_buffer(avctx, picture, 0)) < 0) | |
921 | return ret; | |
922 | ||
923 | if (frame_4cc == AV_RL32("ifr2")) { | |
924 | picture->pict_type = AV_PICTURE_TYPE_I; | |
925 | if ((ret = decode_i2_frame(f, buf - 4, frame_size + 4)) < 0) { | |
926 | av_log(f->avctx, AV_LOG_ERROR, "decode i2 frame failed\n"); | |
927 | return ret; | |
928 | } | |
929 | } else if (frame_4cc == AV_RL32("ifrm")) { | |
930 | picture->pict_type = AV_PICTURE_TYPE_I; | |
931 | if ((ret = decode_i_frame(f, buf, frame_size)) < 0) { | |
932 | av_log(f->avctx, AV_LOG_ERROR, "decode i frame failed\n"); | |
933 | return ret; | |
934 | } | |
935 | } else if (frame_4cc == AV_RL32("pfrm") || frame_4cc == AV_RL32("pfr2")) { | |
936 | picture->pict_type = AV_PICTURE_TYPE_P; | |
937 | if ((ret = decode_p_frame(f, buf, frame_size)) < 0) { | |
938 | av_log(f->avctx, AV_LOG_ERROR, "decode p frame failed\n"); | |
939 | return ret; | |
940 | } | |
941 | } else if (frame_4cc == AV_RL32("snd_")) { | |
942 | av_log(avctx, AV_LOG_ERROR, "ignoring snd_ chunk length:%d\n", | |
943 | buf_size); | |
944 | } else { | |
945 | av_log(avctx, AV_LOG_ERROR, "ignoring unknown chunk length:%d\n", | |
946 | buf_size); | |
947 | } | |
948 | ||
949 | picture->key_frame = picture->pict_type == AV_PICTURE_TYPE_I; | |
950 | ||
951 | av_image_copy_plane(picture->data[0], picture->linesize[0], | |
952 | (const uint8_t*)f->frame_buffer, avctx->width * 2, | |
953 | avctx->width * 2, avctx->height); | |
954 | FFSWAP(uint16_t *, f->frame_buffer, f->last_frame_buffer); | |
955 | ||
956 | *got_frame = 1; | |
957 | ||
958 | emms_c(); | |
959 | ||
960 | return buf_size; | |
961 | } | |
962 | ||
963 | static av_cold int decode_end(AVCodecContext *avctx) | |
964 | { | |
965 | FourXContext * const f = avctx->priv_data; | |
966 | int i; | |
967 | ||
968 | av_freep(&f->frame_buffer); | |
969 | av_freep(&f->last_frame_buffer); | |
970 | av_freep(&f->bitstream_buffer); | |
971 | f->bitstream_buffer_size = 0; | |
972 | for (i = 0; i < CFRAME_BUFFER_COUNT; i++) { | |
973 | av_freep(&f->cfrm[i].data); | |
974 | f->cfrm[i].allocated_size = 0; | |
975 | } | |
976 | ff_free_vlc(&f->pre_vlc); | |
977 | ||
978 | return 0; | |
979 | } | |
980 | ||
981 | static av_cold int decode_init(AVCodecContext *avctx) | |
982 | { | |
983 | FourXContext * const f = avctx->priv_data; | |
984 | int ret; | |
985 | ||
986 | if (avctx->extradata_size != 4 || !avctx->extradata) { | |
987 | av_log(avctx, AV_LOG_ERROR, "extradata wrong or missing\n"); | |
988 | return AVERROR_INVALIDDATA; | |
989 | } | |
990 | if((avctx->width % 16) || (avctx->height % 16)) { | |
991 | av_log(avctx, AV_LOG_ERROR, "unsupported width/height\n"); | |
992 | return AVERROR_INVALIDDATA; | |
993 | } | |
994 | ||
995 | ret = av_image_check_size(avctx->width, avctx->height, 0, avctx); | |
996 | if (ret < 0) | |
997 | return ret; | |
998 | ||
999 | f->frame_buffer = av_mallocz(avctx->width * avctx->height * 2); | |
1000 | f->last_frame_buffer = av_mallocz(avctx->width * avctx->height * 2); | |
1001 | if (!f->frame_buffer || !f->last_frame_buffer) { | |
1002 | decode_end(avctx); | |
1003 | return AVERROR(ENOMEM); | |
1004 | } | |
1005 | ||
1006 | f->version = AV_RL32(avctx->extradata) >> 16; | |
1007 | ff_blockdsp_init(&f->bdsp, avctx); | |
1008 | ff_bswapdsp_init(&f->bbdsp); | |
1009 | f->avctx = avctx; | |
1010 | init_vlcs(f); | |
1011 | ||
1012 | if (f->version > 2) | |
1013 | avctx->pix_fmt = AV_PIX_FMT_RGB565; | |
1014 | else | |
1015 | avctx->pix_fmt = AV_PIX_FMT_BGR555; | |
1016 | ||
1017 | return 0; | |
1018 | } | |
1019 | ||
1020 | AVCodec ff_fourxm_decoder = { | |
1021 | .name = "4xm", | |
1022 | .long_name = NULL_IF_CONFIG_SMALL("4X Movie"), | |
1023 | .type = AVMEDIA_TYPE_VIDEO, | |
1024 | .id = AV_CODEC_ID_4XM, | |
1025 | .priv_data_size = sizeof(FourXContext), | |
1026 | .init = decode_init, | |
1027 | .close = decode_end, | |
1028 | .decode = decode_frame, | |
1029 | .capabilities = CODEC_CAP_DR1, | |
1030 | }; |