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1 | /* | ||
2 | * Apple Intermediate Codec decoder | ||
3 | * | ||
4 | * Copyright (c) 2013 Konstantin Shishkov | ||
5 | * | ||
6 | * This file is part of FFmpeg. | ||
7 | * | ||
8 | * FFmpeg is free software; you can redistribute it and/or | ||
9 | * modify it under the terms of the GNU Lesser General Public | ||
10 | * License as published by the Free Software Foundation; either | ||
11 | * version 2.1 of the License, or (at your option) any later version. | ||
12 | * | ||
13 | * FFmpeg is distributed in the hope that it will be useful, | ||
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
16 | * Lesser General Public License for more details. | ||
17 | * | ||
18 | * You should have received a copy of the GNU Lesser General Public | ||
19 | * License along with FFmpeg; if not, write to the Free Software | ||
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
21 | */ | ||
22 | |||
23 | #include <inttypes.h> | ||
24 | |||
25 | #include "libavutil/mem_internal.h" | ||
26 | |||
27 | #include "avcodec.h" | ||
28 | #include "bytestream.h" | ||
29 | #include "codec_internal.h" | ||
30 | #include "get_bits.h" | ||
31 | #include "golomb.h" | ||
32 | #include "idctdsp.h" | ||
33 | #include "thread.h" | ||
34 | #include "unary.h" | ||
35 | |||
36 | #define AIC_HDR_SIZE 24 | ||
37 | #define AIC_BAND_COEFFS (64 + 32 + 192 + 96) | ||
38 | |||
39 | enum AICBands { | ||
40 | COEFF_LUMA = 0, | ||
41 | COEFF_CHROMA, | ||
42 | COEFF_LUMA_EXT, | ||
43 | COEFF_CHROMA_EXT, | ||
44 | NUM_BANDS | ||
45 | }; | ||
46 | |||
47 | static const uint8_t aic_num_band_coeffs[NUM_BANDS] = { 64, 32, 192, 96 }; | ||
48 | |||
49 | static const uint16_t aic_band_off[NUM_BANDS] = { 0, 64, 96, 288 }; | ||
50 | |||
51 | static const uint8_t aic_quant_matrix[64] = { | ||
52 | 8, 16, 19, 22, 22, 26, 26, 27, | ||
53 | 16, 16, 22, 22, 26, 27, 27, 29, | ||
54 | 19, 22, 26, 26, 27, 29, 29, 35, | ||
55 | 22, 24, 27, 27, 29, 32, 34, 38, | ||
56 | 26, 27, 29, 29, 32, 35, 38, 46, | ||
57 | 27, 29, 34, 34, 35, 40, 46, 56, | ||
58 | 29, 34, 34, 37, 40, 48, 56, 69, | ||
59 | 34, 37, 38, 40, 48, 58, 69, 83, | ||
60 | }; | ||
61 | |||
62 | static const uint8_t aic_y_scan[64] = { | ||
63 | 0, 4, 1, 2, 5, 8, 12, 9, | ||
64 | 6, 3, 7, 10, 13, 14, 11, 15, | ||
65 | 47, 43, 46, 45, 42, 39, 35, 38, | ||
66 | 41, 44, 40, 37, 34, 33, 36, 32, | ||
67 | 16, 20, 17, 18, 21, 24, 28, 25, | ||
68 | 22, 19, 23, 26, 29, 30, 27, 31, | ||
69 | 63, 59, 62, 61, 58, 55, 51, 54, | ||
70 | 57, 60, 56, 53, 50, 49, 52, 48, | ||
71 | }; | ||
72 | |||
73 | static const uint8_t aic_y_ext_scan[192] = { | ||
74 | 64, 72, 65, 66, 73, 80, 88, 81, | ||
75 | 74, 67, 75, 82, 89, 90, 83, 91, | ||
76 | 0, 4, 1, 2, 5, 8, 12, 9, | ||
77 | 6, 3, 7, 10, 13, 14, 11, 15, | ||
78 | 16, 20, 17, 18, 21, 24, 28, 25, | ||
79 | 22, 19, 23, 26, 29, 30, 27, 31, | ||
80 | 155, 147, 154, 153, 146, 139, 131, 138, | ||
81 | 145, 152, 144, 137, 130, 129, 136, 128, | ||
82 | 47, 43, 46, 45, 42, 39, 35, 38, | ||
83 | 41, 44, 40, 37, 34, 33, 36, 32, | ||
84 | 63, 59, 62, 61, 58, 55, 51, 54, | ||
85 | 57, 60, 56, 53, 50, 49, 52, 48, | ||
86 | 96, 104, 97, 98, 105, 112, 120, 113, | ||
87 | 106, 99, 107, 114, 121, 122, 115, 123, | ||
88 | 68, 76, 69, 70, 77, 84, 92, 85, | ||
89 | 78, 71, 79, 86, 93, 94, 87, 95, | ||
90 | 100, 108, 101, 102, 109, 116, 124, 117, | ||
91 | 110, 103, 111, 118, 125, 126, 119, 127, | ||
92 | 187, 179, 186, 185, 178, 171, 163, 170, | ||
93 | 177, 184, 176, 169, 162, 161, 168, 160, | ||
94 | 159, 151, 158, 157, 150, 143, 135, 142, | ||
95 | 149, 156, 148, 141, 134, 133, 140, 132, | ||
96 | 191, 183, 190, 189, 182, 175, 167, 174, | ||
97 | 181, 188, 180, 173, 166, 165, 172, 164, | ||
98 | }; | ||
99 | |||
100 | static const uint8_t aic_c_scan[64] = { | ||
101 | 0, 4, 1, 2, 5, 8, 12, 9, | ||
102 | 6, 3, 7, 10, 13, 14, 11, 15, | ||
103 | 31, 27, 30, 29, 26, 23, 19, 22, | ||
104 | 25, 28, 24, 21, 18, 17, 20, 16, | ||
105 | 32, 36, 33, 34, 37, 40, 44, 41, | ||
106 | 38, 35, 39, 42, 45, 46, 43, 47, | ||
107 | 63, 59, 62, 61, 58, 55, 51, 54, | ||
108 | 57, 60, 56, 53, 50, 49, 52, 48, | ||
109 | }; | ||
110 | |||
111 | static const uint8_t aic_c_ext_scan[192] = { | ||
112 | 16, 24, 17, 18, 25, 32, 40, 33, | ||
113 | 26, 19, 27, 34, 41, 42, 35, 43, | ||
114 | 0, 4, 1, 2, 5, 8, 12, 9, | ||
115 | 6, 3, 7, 10, 13, 14, 11, 15, | ||
116 | 20, 28, 21, 22, 29, 36, 44, 37, | ||
117 | 30, 23, 31, 38, 45, 46, 39, 47, | ||
118 | 95, 87, 94, 93, 86, 79, 71, 78, | ||
119 | 85, 92, 84, 77, 70, 69, 76, 68, | ||
120 | 63, 59, 62, 61, 58, 55, 51, 54, | ||
121 | 57, 60, 56, 53, 50, 49, 52, 48, | ||
122 | 91, 83, 90, 89, 82, 75, 67, 74, | ||
123 | 81, 88, 80, 73, 66, 65, 72, 64, | ||
124 | 112, 120, 113, 114, 121, 128, 136, 129, | ||
125 | 122, 115, 123, 130, 137, 138, 131, 139, | ||
126 | 96, 100, 97, 98, 101, 104, 108, 105, | ||
127 | 102, 99, 103, 106, 109, 110, 107, 111, | ||
128 | 116, 124, 117, 118, 125, 132, 140, 133, | ||
129 | 126, 119, 127, 134, 141, 142, 135, 143, | ||
130 | 191, 183, 190, 189, 182, 175, 167, 174, | ||
131 | 181, 188, 180, 173, 166, 165, 172, 164, | ||
132 | 159, 155, 158, 157, 154, 151, 147, 150, | ||
133 | 153, 156, 152, 149, 146, 145, 148, 144, | ||
134 | 187, 179, 186, 185, 178, 171, 163, 170, | ||
135 | 177, 184, 176, 169, 162, 161, 168, 160, | ||
136 | }; | ||
137 | |||
138 | static const uint8_t * const aic_scan[NUM_BANDS] = { | ||
139 | aic_y_scan, aic_c_scan, aic_y_ext_scan, aic_c_ext_scan | ||
140 | }; | ||
141 | |||
142 | typedef struct AICContext { | ||
143 | AVCodecContext *avctx; | ||
144 | AVFrame *frame; | ||
145 | IDCTDSPContext idsp; | ||
146 | |||
147 | int num_x_slices; | ||
148 | int slice_width; | ||
149 | int mb_width, mb_height; | ||
150 | int quant; | ||
151 | int interlaced; | ||
152 | |||
153 | int16_t *slice_data; | ||
154 | int16_t *data_ptr[NUM_BANDS]; | ||
155 | |||
156 | DECLARE_ALIGNED(16, int16_t, block)[64]; | ||
157 | DECLARE_ALIGNED(16, uint8_t, quant_matrix)[64]; | ||
158 | } AICContext; | ||
159 | |||
160 | 72 | static int aic_decode_header(AICContext *ctx, const uint8_t *src, int size) | |
161 | { | ||
162 | uint32_t frame_size; | ||
163 | int width, height; | ||
164 | |||
165 |
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72 | if (src[0] != 1) { |
166 | ✗ | av_log(ctx->avctx, AV_LOG_ERROR, "Invalid version %d\n", src[0]); | |
167 | ✗ | return AVERROR_INVALIDDATA; | |
168 | } | ||
169 |
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72 | if (src[1] != AIC_HDR_SIZE - 2) { |
170 | ✗ | av_log(ctx->avctx, AV_LOG_ERROR, "Invalid header size %d\n", src[1]); | |
171 | ✗ | return AVERROR_INVALIDDATA; | |
172 | } | ||
173 | 72 | frame_size = AV_RB32(src + 2); | |
174 | 72 | width = AV_RB16(src + 6); | |
175 | 72 | height = AV_RB16(src + 8); | |
176 |
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72 | if (frame_size > size) { |
177 | ✗ | av_log(ctx->avctx, AV_LOG_ERROR, "Frame size should be %"PRIu32" got %d\n", | |
178 | frame_size, size); | ||
179 | ✗ | return AVERROR_INVALIDDATA; | |
180 | } | ||
181 |
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72 | if (width != ctx->avctx->width || height != ctx->avctx->height) { |
182 | ✗ | av_log(ctx->avctx, AV_LOG_ERROR, | |
183 | "Picture dimension changed: old: %d x %d, new: %d x %d\n", | ||
184 | ✗ | ctx->avctx->width, ctx->avctx->height, width, height); | |
185 | ✗ | return AVERROR_INVALIDDATA; | |
186 | } | ||
187 | 72 | ctx->quant = src[15]; | |
188 | 72 | ctx->interlaced = ((src[16] >> 4) == 3); | |
189 | |||
190 | 72 | return 0; | |
191 | } | ||
192 | |||
193 | #define GET_CODE(val, type, add_bits) \ | ||
194 | do { \ | ||
195 | if (type) \ | ||
196 | val = get_ue_golomb(gb); \ | ||
197 | else \ | ||
198 | val = get_unary(gb, 1, 31); \ | ||
199 | if (add_bits) \ | ||
200 | val = (val << add_bits) + get_bits(gb, add_bits); \ | ||
201 | } while (0) | ||
202 | |||
203 | 15888 | static int aic_decode_coeffs(GetBitContext *gb, int16_t *dst, | |
204 | int band, int slice_width, int force_chroma) | ||
205 | { | ||
206 | int has_skips, coeff_type, coeff_bits, skip_type, skip_bits; | ||
207 | 15888 | const int num_coeffs = aic_num_band_coeffs[band]; | |
208 | 15888 | const uint8_t *scan = aic_scan[band | force_chroma]; | |
209 | int mb, idx; | ||
210 | unsigned val; | ||
211 | |||
212 |
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15888 | if (get_bits_left(gb) < 5) |
213 | ✗ | return AVERROR_INVALIDDATA; | |
214 | |||
215 | 15888 | has_skips = get_bits1(gb); | |
216 | 15888 | coeff_type = get_bits1(gb); | |
217 | 15888 | coeff_bits = get_bits(gb, 3); | |
218 | |||
219 |
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15888 | if (has_skips) { |
220 | 13996 | skip_type = get_bits1(gb); | |
221 | 13996 | skip_bits = get_bits(gb, 3); | |
222 | |||
223 |
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437433 | for (mb = 0; mb < slice_width; mb++) { |
224 | 423437 | idx = -1; | |
225 | do { | ||
226 |
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5032630 | GET_CODE(val, skip_type, skip_bits); |
227 |
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5032630 | if (val >= 0x10000) |
228 | ✗ | return AVERROR_INVALIDDATA; | |
229 | 5032630 | idx += val + 1; | |
230 |
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5032630 | if (idx >= num_coeffs) |
231 | 252068 | break; | |
232 |
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4780562 | GET_CODE(val, coeff_type, coeff_bits); |
233 | 4780562 | val++; | |
234 |
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4780562 | if (val >= 0x10000) |
235 | ✗ | return AVERROR_INVALIDDATA; | |
236 | 4780562 | dst[scan[idx]] = val; | |
237 |
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4780562 | } while (idx < num_coeffs - 1); |
238 | 423437 | dst += num_coeffs; | |
239 | } | ||
240 | } else { | ||
241 |
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58743 | for (mb = 0; mb < slice_width; mb++) { |
242 |
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10576595 | for (idx = 0; idx < num_coeffs; idx++) { |
243 |
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10519744 | GET_CODE(val, coeff_type, coeff_bits); |
244 |
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10519744 | if (val >= 0x10000) |
245 | ✗ | return AVERROR_INVALIDDATA; | |
246 | 10519744 | dst[scan[idx]] = val; | |
247 | } | ||
248 | 56851 | dst += num_coeffs; | |
249 | } | ||
250 | } | ||
251 | 15888 | return 0; | |
252 | } | ||
253 | |||
254 | 353232 | static void recombine_block(int16_t *dst, const uint8_t *scan, | |
255 | int16_t **base, int16_t **ext) | ||
256 | { | ||
257 | int i, j; | ||
258 | |||
259 |
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1766160 | for (i = 0; i < 4; i++) { |
260 |
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7064640 | for (j = 0; j < 4; j++) |
261 | 5651712 | dst[scan[i * 8 + j]] = (*base)[j]; | |
262 |
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7064640 | for (j = 0; j < 4; j++) |
263 | 5651712 | dst[scan[i * 8 + j + 4]] = (*ext)[j]; | |
264 | 1412928 | *base += 4; | |
265 | 1412928 | *ext += 4; | |
266 | } | ||
267 |
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1766160 | for (; i < 8; i++) { |
268 |
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12716352 | for (j = 0; j < 8; j++) |
269 | 11303424 | dst[scan[i * 8 + j]] = (*ext)[j]; | |
270 | 1412928 | *ext += 8; | |
271 | } | ||
272 | 353232 | } | |
273 | |||
274 | 367200 | static void recombine_block_il(int16_t *dst, const uint8_t *scan, | |
275 | int16_t **base, int16_t **ext, | ||
276 | int block_no) | ||
277 | { | ||
278 | int i, j; | ||
279 | |||
280 |
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367200 | if (block_no < 2) { |
281 |
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1652400 | for (i = 0; i < 8; i++) { |
282 |
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7344000 | for (j = 0; j < 4; j++) |
283 | 5875200 | dst[scan[i * 8 + j]] = (*base)[j]; | |
284 |
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7344000 | for (j = 0; j < 4; j++) |
285 | 5875200 | dst[scan[i * 8 + j + 4]] = (*ext)[j]; | |
286 | 1468800 | *base += 4; | |
287 | 1468800 | *ext += 4; | |
288 | } | ||
289 | } else { | ||
290 |
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11934000 | for (i = 0; i < 64; i++) |
291 | 11750400 | dst[scan[i]] = (*ext)[i]; | |
292 | 183600 | *ext += 64; | |
293 | } | ||
294 | 367200 | } | |
295 | |||
296 | 720432 | static void unquant_block(int16_t *block, int q, uint8_t *quant_matrix) | |
297 | { | ||
298 | int i; | ||
299 | |||
300 |
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46828080 | for (i = 0; i < 64; i++) { |
301 | 46107648 | int val = (uint16_t)block[i]; | |
302 | 46107648 | int sign = val & 1; | |
303 | |||
304 | 46107648 | block[i] = (((val >> 1) ^ -sign) * q * quant_matrix[i] >> 4) | |
305 | 46107648 | + sign; | |
306 | } | ||
307 | 720432 | } | |
308 | |||
309 | 3972 | static int aic_decode_slice(AICContext *ctx, int mb_x, int mb_y, | |
310 | const uint8_t *src, int src_size) | ||
311 | { | ||
312 | GetBitContext gb; | ||
313 | int ret, i, mb, blk; | ||
314 | 3972 | int slice_width = FFMIN(ctx->slice_width, ctx->mb_width - mb_x); | |
315 |
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3972 | int last_row = mb_y && mb_y == ctx->mb_height - 1; |
316 | int y_pos, c_pos; | ||
317 | uint8_t *Y, *C[2]; | ||
318 | uint8_t *dst; | ||
319 | 3972 | int16_t *base_y = ctx->data_ptr[COEFF_LUMA]; | |
320 | 3972 | int16_t *base_c = ctx->data_ptr[COEFF_CHROMA]; | |
321 | 3972 | int16_t *ext_y = ctx->data_ptr[COEFF_LUMA_EXT]; | |
322 | 3972 | int16_t *ext_c = ctx->data_ptr[COEFF_CHROMA_EXT]; | |
323 | 3972 | const int ystride = ctx->frame->linesize[0]; | |
324 | |||
325 |
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3972 | if (last_row) { |
326 | 102 | y_pos = (ctx->avctx->height - 16); | |
327 | 102 | c_pos = ((ctx->avctx->height+1)/2 - 8); | |
328 | } else { | ||
329 | 3870 | y_pos = mb_y * 16; | |
330 | 3870 | c_pos = mb_y * 8; | |
331 | } | ||
332 | |||
333 | 3972 | Y = ctx->frame->data[0] + mb_x * 16 + y_pos * ystride; | |
334 |
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11916 | for (i = 0; i < 2; i++) |
335 | 7944 | C[i] = ctx->frame->data[i + 1] + mb_x * 8 | |
336 | 7944 | + c_pos * ctx->frame->linesize[i + 1]; | |
337 | 3972 | init_get_bits(&gb, src, src_size * 8); | |
338 | |||
339 | 3972 | memset(ctx->slice_data, 0, | |
340 | sizeof(*ctx->slice_data) * slice_width * AIC_BAND_COEFFS); | ||
341 |
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19860 | for (i = 0; i < NUM_BANDS; i++) |
342 |
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15888 | if ((ret = aic_decode_coeffs(&gb, ctx->data_ptr[i], |
343 | i, slice_width, | ||
344 | 15888 | !ctx->interlaced)) < 0) | |
345 | ✗ | return ret; | |
346 | |||
347 |
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124044 | for (mb = 0; mb < slice_width; mb++) { |
348 |
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600360 | for (blk = 0; blk < 4; blk++) { |
349 |
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480288 | if (!ctx->interlaced) |
350 | 113088 | recombine_block(ctx->block, ctx->idsp.idct_permutation, | |
351 | &base_y, &ext_y); | ||
352 | else | ||
353 | 367200 | recombine_block_il(ctx->block, ctx->idsp.idct_permutation, | |
354 | &base_y, &ext_y, blk); | ||
355 | 480288 | unquant_block(ctx->block, ctx->quant, ctx->quant_matrix); | |
356 | 480288 | ctx->idsp.idct(ctx->block); | |
357 | |||
358 |
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480288 | if (!ctx->interlaced) { |
359 | 113088 | dst = Y + (blk >> 1) * 8 * ystride + (blk & 1) * 8; | |
360 | 113088 | ctx->idsp.put_signed_pixels_clamped(ctx->block, dst, ystride); | |
361 | } else { | ||
362 | 367200 | dst = Y + (blk & 1) * 8 + (blk >> 1) * ystride; | |
363 | 367200 | ctx->idsp.put_signed_pixels_clamped(ctx->block, dst, | |
364 | 367200 | ystride * 2); | |
365 | } | ||
366 | } | ||
367 | 120072 | Y += 16; | |
368 | |||
369 |
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360216 | for (blk = 0; blk < 2; blk++) { |
370 | 240144 | recombine_block(ctx->block, ctx->idsp.idct_permutation, | |
371 | &base_c, &ext_c); | ||
372 | 240144 | unquant_block(ctx->block, ctx->quant, ctx->quant_matrix); | |
373 | 240144 | ctx->idsp.idct(ctx->block); | |
374 | 240144 | ctx->idsp.put_signed_pixels_clamped(ctx->block, C[blk], | |
375 | 240144 | ctx->frame->linesize[blk + 1]); | |
376 | 240144 | C[blk] += 8; | |
377 | } | ||
378 | } | ||
379 | |||
380 | 3972 | return 0; | |
381 | } | ||
382 | |||
383 | 72 | static int aic_decode_frame(AVCodecContext *avctx, AVFrame *frame, | |
384 | int *got_frame, AVPacket *avpkt) | ||
385 | { | ||
386 | 72 | AICContext *ctx = avctx->priv_data; | |
387 | 72 | const uint8_t *buf = avpkt->data; | |
388 | 72 | int buf_size = avpkt->size; | |
389 | GetByteContext gb; | ||
390 | uint32_t off; | ||
391 | int x, y, ret; | ||
392 | int slice_size; | ||
393 | |||
394 | 72 | ctx->frame = frame; | |
395 | 72 | ctx->frame->pict_type = AV_PICTURE_TYPE_I; | |
396 | 72 | ctx->frame->flags |= AV_FRAME_FLAG_KEY; | |
397 | |||
398 | 72 | off = FFALIGN(AIC_HDR_SIZE + ctx->num_x_slices * ctx->mb_height * 2, 4); | |
399 | |||
400 |
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72 | if (buf_size < off) { |
401 | ✗ | av_log(avctx, AV_LOG_ERROR, "Too small frame\n"); | |
402 | ✗ | return AVERROR_INVALIDDATA; | |
403 | } | ||
404 | |||
405 | 72 | ret = aic_decode_header(ctx, buf, buf_size); | |
406 |
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72 | if (ret < 0) { |
407 | ✗ | av_log(avctx, AV_LOG_ERROR, "Invalid header\n"); | |
408 | ✗ | return ret; | |
409 | } | ||
410 | |||
411 |
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72 | if ((ret = ff_thread_get_buffer(avctx, ctx->frame, 0)) < 0) |
412 | ✗ | return ret; | |
413 | |||
414 | 72 | bytestream2_init(&gb, buf + AIC_HDR_SIZE, | |
415 | 72 | ctx->num_x_slices * ctx->mb_height * 2); | |
416 | |||
417 |
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2004 | for (y = 0; y < ctx->mb_height; y++) { |
418 |
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5904 | for (x = 0; x < ctx->mb_width; x += ctx->slice_width) { |
419 | 3972 | slice_size = bytestream2_get_le16(&gb) * 4; | |
420 |
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3972 | if (slice_size + off > buf_size || !slice_size) { |
421 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
422 | "Incorrect slice size %d at %d.%d\n", slice_size, x, y); | ||
423 | ✗ | return AVERROR_INVALIDDATA; | |
424 | } | ||
425 | |||
426 | 3972 | ret = aic_decode_slice(ctx, x, y, buf + off, slice_size); | |
427 |
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3972 | if (ret < 0) { |
428 | ✗ | av_log(avctx, AV_LOG_ERROR, | |
429 | "Error decoding slice at %d.%d\n", x, y); | ||
430 | ✗ | return ret; | |
431 | } | ||
432 | |||
433 | 3972 | off += slice_size; | |
434 | } | ||
435 | } | ||
436 | |||
437 | 72 | *got_frame = 1; | |
438 | |||
439 | 72 | return avpkt->size; | |
440 | } | ||
441 | |||
442 | 4 | static av_cold int aic_decode_init(AVCodecContext *avctx) | |
443 | { | ||
444 | 4 | AICContext *ctx = avctx->priv_data; | |
445 | int i; | ||
446 | |||
447 | 4 | ctx->avctx = avctx; | |
448 | |||
449 | 4 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; | |
450 | |||
451 | 4 | ff_idctdsp_init(&ctx->idsp, avctx); | |
452 | |||
453 |
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260 | for (i = 0; i < 64; i++) |
454 | 256 | ctx->quant_matrix[ctx->idsp.idct_permutation[i]] = aic_quant_matrix[i]; | |
455 | |||
456 | 4 | ctx->mb_width = FFALIGN(avctx->width, 16) >> 4; | |
457 | 4 | ctx->mb_height = FFALIGN(avctx->height, 16) >> 4; | |
458 | |||
459 | 4 | ctx->num_x_slices = (ctx->mb_width + 15) >> 4; | |
460 | 4 | ctx->slice_width = 16; | |
461 |
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8 | for (i = 1; i < ctx->mb_width; i++) { |
462 |
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8 | if (!(ctx->mb_width % i) && (ctx->mb_width / i <= 32)) { |
463 | 4 | ctx->slice_width = ctx->mb_width / i; | |
464 | 4 | ctx->num_x_slices = i; | |
465 | 4 | break; | |
466 | } | ||
467 | } | ||
468 | |||
469 | 4 | ctx->slice_data = av_malloc_array(ctx->slice_width, AIC_BAND_COEFFS | |
470 | * sizeof(*ctx->slice_data)); | ||
471 |
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4 | if (!ctx->slice_data) { |
472 | ✗ | av_log(avctx, AV_LOG_ERROR, "Error allocating slice buffer\n"); | |
473 | |||
474 | ✗ | return AVERROR(ENOMEM); | |
475 | } | ||
476 | |||
477 |
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20 | for (i = 0; i < NUM_BANDS; i++) |
478 | 16 | ctx->data_ptr[i] = ctx->slice_data + ctx->slice_width | |
479 | 16 | * aic_band_off[i]; | |
480 | |||
481 | 4 | return 0; | |
482 | } | ||
483 | |||
484 | 4 | static av_cold int aic_decode_close(AVCodecContext *avctx) | |
485 | { | ||
486 | 4 | AICContext *ctx = avctx->priv_data; | |
487 | |||
488 | 4 | av_freep(&ctx->slice_data); | |
489 | |||
490 | 4 | return 0; | |
491 | } | ||
492 | |||
493 | const FFCodec ff_aic_decoder = { | ||
494 | .p.name = "aic", | ||
495 | CODEC_LONG_NAME("Apple Intermediate Codec"), | ||
496 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
497 | .p.id = AV_CODEC_ID_AIC, | ||
498 | .priv_data_size = sizeof(AICContext), | ||
499 | .init = aic_decode_init, | ||
500 | .close = aic_decode_close, | ||
501 | FF_CODEC_DECODE_CB(aic_decode_frame), | ||
502 | .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS, | ||
503 | }; | ||
504 |