blob: 5547dfd87f2230c5287c78aa482b4db562593f57
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 | |
342 | static int decode_p_block(FourXContext *f, uint16_t *dst, const uint16_t *src, |
343 | int log2w, int log2h, int stride) |
344 | { |
345 | int index, h, code, ret, scale = 1; |
346 | uint16_t *start, *end; |
347 | unsigned dc = 0; |
348 | |
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); |
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 overflow\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 & AV_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 - AV_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 + AV_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 = AV_CODEC_CAP_DR1, |
1030 | }; |
1031 |