/src/ffmpeg/libavcodec/aic.c
Line | Count | Source (jump to first uncovered line) |
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.h" |
26 | | #include "libavutil/mem_internal.h" |
27 | | |
28 | | #include "avcodec.h" |
29 | | #include "bytestream.h" |
30 | | #include "codec_internal.h" |
31 | | #include "get_bits.h" |
32 | | #include "golomb.h" |
33 | | #include "idctdsp.h" |
34 | | #include "thread.h" |
35 | | #include "unary.h" |
36 | | |
37 | 244k | #define AIC_HDR_SIZE 24 |
38 | 117k | #define AIC_BAND_COEFFS (64 + 32 + 192 + 96) |
39 | | |
40 | | enum AICBands { |
41 | | COEFF_LUMA = 0, |
42 | | COEFF_CHROMA, |
43 | | COEFF_LUMA_EXT, |
44 | | COEFF_CHROMA_EXT, |
45 | | NUM_BANDS |
46 | | }; |
47 | | |
48 | | static const uint8_t aic_num_band_coeffs[NUM_BANDS] = { 64, 32, 192, 96 }; |
49 | | |
50 | | static const uint16_t aic_band_off[NUM_BANDS] = { 0, 64, 96, 288 }; |
51 | | |
52 | | static const uint8_t aic_quant_matrix[64] = { |
53 | | 8, 16, 19, 22, 22, 26, 26, 27, |
54 | | 16, 16, 22, 22, 26, 27, 27, 29, |
55 | | 19, 22, 26, 26, 27, 29, 29, 35, |
56 | | 22, 24, 27, 27, 29, 32, 34, 38, |
57 | | 26, 27, 29, 29, 32, 35, 38, 46, |
58 | | 27, 29, 34, 34, 35, 40, 46, 56, |
59 | | 29, 34, 34, 37, 40, 48, 56, 69, |
60 | | 34, 37, 38, 40, 48, 58, 69, 83, |
61 | | }; |
62 | | |
63 | | static const uint8_t aic_y_scan[64] = { |
64 | | 0, 4, 1, 2, 5, 8, 12, 9, |
65 | | 6, 3, 7, 10, 13, 14, 11, 15, |
66 | | 47, 43, 46, 45, 42, 39, 35, 38, |
67 | | 41, 44, 40, 37, 34, 33, 36, 32, |
68 | | 16, 20, 17, 18, 21, 24, 28, 25, |
69 | | 22, 19, 23, 26, 29, 30, 27, 31, |
70 | | 63, 59, 62, 61, 58, 55, 51, 54, |
71 | | 57, 60, 56, 53, 50, 49, 52, 48, |
72 | | }; |
73 | | |
74 | | static const uint8_t aic_y_ext_scan[192] = { |
75 | | 64, 72, 65, 66, 73, 80, 88, 81, |
76 | | 74, 67, 75, 82, 89, 90, 83, 91, |
77 | | 0, 4, 1, 2, 5, 8, 12, 9, |
78 | | 6, 3, 7, 10, 13, 14, 11, 15, |
79 | | 16, 20, 17, 18, 21, 24, 28, 25, |
80 | | 22, 19, 23, 26, 29, 30, 27, 31, |
81 | | 155, 147, 154, 153, 146, 139, 131, 138, |
82 | | 145, 152, 144, 137, 130, 129, 136, 128, |
83 | | 47, 43, 46, 45, 42, 39, 35, 38, |
84 | | 41, 44, 40, 37, 34, 33, 36, 32, |
85 | | 63, 59, 62, 61, 58, 55, 51, 54, |
86 | | 57, 60, 56, 53, 50, 49, 52, 48, |
87 | | 96, 104, 97, 98, 105, 112, 120, 113, |
88 | | 106, 99, 107, 114, 121, 122, 115, 123, |
89 | | 68, 76, 69, 70, 77, 84, 92, 85, |
90 | | 78, 71, 79, 86, 93, 94, 87, 95, |
91 | | 100, 108, 101, 102, 109, 116, 124, 117, |
92 | | 110, 103, 111, 118, 125, 126, 119, 127, |
93 | | 187, 179, 186, 185, 178, 171, 163, 170, |
94 | | 177, 184, 176, 169, 162, 161, 168, 160, |
95 | | 159, 151, 158, 157, 150, 143, 135, 142, |
96 | | 149, 156, 148, 141, 134, 133, 140, 132, |
97 | | 191, 183, 190, 189, 182, 175, 167, 174, |
98 | | 181, 188, 180, 173, 166, 165, 172, 164, |
99 | | }; |
100 | | |
101 | | static const uint8_t aic_c_scan[64] = { |
102 | | 0, 4, 1, 2, 5, 8, 12, 9, |
103 | | 6, 3, 7, 10, 13, 14, 11, 15, |
104 | | 31, 27, 30, 29, 26, 23, 19, 22, |
105 | | 25, 28, 24, 21, 18, 17, 20, 16, |
106 | | 32, 36, 33, 34, 37, 40, 44, 41, |
107 | | 38, 35, 39, 42, 45, 46, 43, 47, |
108 | | 63, 59, 62, 61, 58, 55, 51, 54, |
109 | | 57, 60, 56, 53, 50, 49, 52, 48, |
110 | | }; |
111 | | |
112 | | static const uint8_t aic_c_ext_scan[192] = { |
113 | | 16, 24, 17, 18, 25, 32, 40, 33, |
114 | | 26, 19, 27, 34, 41, 42, 35, 43, |
115 | | 0, 4, 1, 2, 5, 8, 12, 9, |
116 | | 6, 3, 7, 10, 13, 14, 11, 15, |
117 | | 20, 28, 21, 22, 29, 36, 44, 37, |
118 | | 30, 23, 31, 38, 45, 46, 39, 47, |
119 | | 95, 87, 94, 93, 86, 79, 71, 78, |
120 | | 85, 92, 84, 77, 70, 69, 76, 68, |
121 | | 63, 59, 62, 61, 58, 55, 51, 54, |
122 | | 57, 60, 56, 53, 50, 49, 52, 48, |
123 | | 91, 83, 90, 89, 82, 75, 67, 74, |
124 | | 81, 88, 80, 73, 66, 65, 72, 64, |
125 | | 112, 120, 113, 114, 121, 128, 136, 129, |
126 | | 122, 115, 123, 130, 137, 138, 131, 139, |
127 | | 96, 100, 97, 98, 101, 104, 108, 105, |
128 | | 102, 99, 103, 106, 109, 110, 107, 111, |
129 | | 116, 124, 117, 118, 125, 132, 140, 133, |
130 | | 126, 119, 127, 134, 141, 142, 135, 143, |
131 | | 191, 183, 190, 189, 182, 175, 167, 174, |
132 | | 181, 188, 180, 173, 166, 165, 172, 164, |
133 | | 159, 155, 158, 157, 154, 151, 147, 150, |
134 | | 153, 156, 152, 149, 146, 145, 148, 144, |
135 | | 187, 179, 186, 185, 178, 171, 163, 170, |
136 | | 177, 184, 176, 169, 162, 161, 168, 160, |
137 | | }; |
138 | | |
139 | | static const uint8_t * const aic_scan[NUM_BANDS] = { |
140 | | aic_y_scan, aic_c_scan, aic_y_ext_scan, aic_c_ext_scan |
141 | | }; |
142 | | |
143 | | typedef struct AICContext { |
144 | | AVCodecContext *avctx; |
145 | | AVFrame *frame; |
146 | | IDCTDSPContext idsp; |
147 | | |
148 | | int num_x_slices; |
149 | | int slice_width; |
150 | | int mb_width, mb_height; |
151 | | int quant; |
152 | | int interlaced; |
153 | | |
154 | | int16_t *slice_data; |
155 | | int16_t *data_ptr[NUM_BANDS]; |
156 | | |
157 | | DECLARE_ALIGNED(16, int16_t, block)[64]; |
158 | | DECLARE_ALIGNED(16, uint8_t, quant_matrix)[64]; |
159 | | } AICContext; |
160 | | |
161 | | static int aic_decode_header(AICContext *ctx, const uint8_t *src, int size) |
162 | 127k | { |
163 | 127k | uint32_t frame_size; |
164 | 127k | int width, height; |
165 | | |
166 | 127k | if (src[0] != 1) { |
167 | 1.33k | av_log(ctx->avctx, AV_LOG_ERROR, "Invalid version %d\n", src[0]); |
168 | 1.33k | return AVERROR_INVALIDDATA; |
169 | 1.33k | } |
170 | 125k | if (src[1] != AIC_HDR_SIZE - 2) { |
171 | 321 | av_log(ctx->avctx, AV_LOG_ERROR, "Invalid header size %d\n", src[1]); |
172 | 321 | return AVERROR_INVALIDDATA; |
173 | 321 | } |
174 | 125k | frame_size = AV_RB32(src + 2); |
175 | 125k | width = AV_RB16(src + 6); |
176 | 125k | height = AV_RB16(src + 8); |
177 | 125k | if (frame_size > size) { |
178 | 390 | av_log(ctx->avctx, AV_LOG_ERROR, "Frame size should be %"PRIu32" got %d\n", |
179 | 390 | frame_size, size); |
180 | 390 | return AVERROR_INVALIDDATA; |
181 | 390 | } |
182 | 125k | if (width != ctx->avctx->width || height != ctx->avctx->height) { |
183 | 5.59k | av_log(ctx->avctx, AV_LOG_ERROR, |
184 | 5.59k | "Picture dimension changed: old: %d x %d, new: %d x %d\n", |
185 | 5.59k | ctx->avctx->width, ctx->avctx->height, width, height); |
186 | 5.59k | return AVERROR_INVALIDDATA; |
187 | 5.59k | } |
188 | 119k | ctx->quant = src[15]; |
189 | 119k | ctx->interlaced = ((src[16] >> 4) == 3); |
190 | | |
191 | 119k | return 0; |
192 | 125k | } |
193 | | |
194 | | #define GET_CODE(val, type, add_bits) \ |
195 | 6.03M | do { \ |
196 | 6.03M | if (type) \ |
197 | 6.03M | val = get_ue_golomb(gb); \ |
198 | 6.03M | else \ |
199 | 6.03M | val = get_unary(gb, 1, 31); \ |
200 | 6.03M | if (add_bits) \ |
201 | 6.03M | val = (val << add_bits) + get_bits(gb, add_bits); \ |
202 | 6.03M | } while (0) |
203 | | |
204 | | static int aic_decode_coeffs(GetBitContext *gb, int16_t *dst, |
205 | | int band, int slice_width, int force_chroma) |
206 | 460k | { |
207 | 460k | int has_skips, coeff_type, coeff_bits, skip_type, skip_bits; |
208 | 460k | const int num_coeffs = aic_num_band_coeffs[band]; |
209 | 460k | const uint8_t *scan = aic_scan[band | force_chroma]; |
210 | 460k | int mb, idx; |
211 | 460k | unsigned val; |
212 | | |
213 | 460k | if (get_bits_left(gb) < 5) |
214 | 444 | return AVERROR_INVALIDDATA; |
215 | | |
216 | 459k | has_skips = get_bits1(gb); |
217 | 459k | coeff_type = get_bits1(gb); |
218 | 459k | coeff_bits = get_bits(gb, 3); |
219 | | |
220 | 459k | if (has_skips) { |
221 | 432k | skip_type = get_bits1(gb); |
222 | 432k | skip_bits = get_bits(gb, 3); |
223 | | |
224 | 921k | for (mb = 0; mb < slice_width; mb++) { |
225 | 488k | idx = -1; |
226 | 1.30M | do { |
227 | 1.30M | GET_CODE(val, skip_type, skip_bits); |
228 | 1.30M | if (val >= 0x10000) |
229 | 404 | return AVERROR_INVALIDDATA; |
230 | 1.29M | idx += val + 1; |
231 | 1.29M | if (idx >= num_coeffs) |
232 | 483k | break; |
233 | 815k | GET_CODE(val, coeff_type, coeff_bits); |
234 | 815k | val++; |
235 | 815k | if (val >= 0x10000) |
236 | 439 | return AVERROR_INVALIDDATA; |
237 | 815k | dst[scan[idx]] = val; |
238 | 815k | } while (idx < num_coeffs - 1); |
239 | 488k | dst += num_coeffs; |
240 | 488k | } |
241 | 432k | } else { |
242 | 69.6k | for (mb = 0; mb < slice_width; mb++) { |
243 | 3.95M | for (idx = 0; idx < num_coeffs; idx++) { |
244 | 3.91M | GET_CODE(val, coeff_type, coeff_bits); |
245 | 3.91M | if (val >= 0x10000) |
246 | 297 | return AVERROR_INVALIDDATA; |
247 | 3.91M | dst[scan[idx]] = val; |
248 | 3.91M | } |
249 | 42.9k | dst += num_coeffs; |
250 | 42.9k | } |
251 | 26.6k | } |
252 | 458k | return 0; |
253 | 459k | } |
254 | | |
255 | | static void recombine_block(int16_t *dst, const uint8_t *scan, |
256 | | int16_t **base, int16_t **ext) |
257 | 760k | { |
258 | 760k | int i, j; |
259 | | |
260 | 3.80M | for (i = 0; i < 4; i++) { |
261 | 15.2M | for (j = 0; j < 4; j++) |
262 | 12.1M | dst[scan[i * 8 + j]] = (*base)[j]; |
263 | 15.2M | for (j = 0; j < 4; j++) |
264 | 12.1M | dst[scan[i * 8 + j + 4]] = (*ext)[j]; |
265 | 3.04M | *base += 4; |
266 | 3.04M | *ext += 4; |
267 | 3.04M | } |
268 | 3.80M | for (; i < 8; i++) { |
269 | 27.3M | for (j = 0; j < 8; j++) |
270 | 24.3M | dst[scan[i * 8 + j]] = (*ext)[j]; |
271 | 3.04M | *ext += 8; |
272 | 3.04M | } |
273 | 760k | } |
274 | | |
275 | | static void recombine_block_il(int16_t *dst, const uint8_t *scan, |
276 | | int16_t **base, int16_t **ext, |
277 | | int block_no) |
278 | 21.4k | { |
279 | 21.4k | int i, j; |
280 | | |
281 | 21.4k | if (block_no < 2) { |
282 | 96.3k | for (i = 0; i < 8; i++) { |
283 | 428k | for (j = 0; j < 4; j++) |
284 | 342k | dst[scan[i * 8 + j]] = (*base)[j]; |
285 | 428k | for (j = 0; j < 4; j++) |
286 | 342k | dst[scan[i * 8 + j + 4]] = (*ext)[j]; |
287 | 85.6k | *base += 4; |
288 | 85.6k | *ext += 4; |
289 | 85.6k | } |
290 | 10.7k | } else { |
291 | 695k | for (i = 0; i < 64; i++) |
292 | 685k | dst[scan[i]] = (*ext)[i]; |
293 | 10.7k | *ext += 64; |
294 | 10.7k | } |
295 | 21.4k | } |
296 | | |
297 | | static void unquant_block(int16_t *block, int q, uint8_t *quant_matrix) |
298 | 782k | { |
299 | 782k | int i; |
300 | | |
301 | 50.8M | for (i = 0; i < 64; i++) { |
302 | 50.0M | int val = (uint16_t)block[i]; |
303 | 50.0M | int sign = val & 1; |
304 | | |
305 | 50.0M | block[i] = (((val >> 1) ^ -sign) * q * quant_matrix[i] >> 4) |
306 | 50.0M | + sign; |
307 | 50.0M | } |
308 | 782k | } |
309 | | |
310 | | static int aic_decode_slice(AICContext *ctx, int mb_x, int mb_y, |
311 | | const uint8_t *src, int src_size) |
312 | 115k | { |
313 | 115k | GetBitContext gb; |
314 | 115k | int ret, i, mb, blk; |
315 | 115k | int slice_width = FFMIN(ctx->slice_width, ctx->mb_width - mb_x); |
316 | 115k | int last_row = mb_y && mb_y == ctx->mb_height - 1; |
317 | 115k | int y_pos, c_pos; |
318 | 115k | uint8_t *Y, *C[2]; |
319 | 115k | uint8_t *dst; |
320 | 115k | int16_t *base_y = ctx->data_ptr[COEFF_LUMA]; |
321 | 115k | int16_t *base_c = ctx->data_ptr[COEFF_CHROMA]; |
322 | 115k | int16_t *ext_y = ctx->data_ptr[COEFF_LUMA_EXT]; |
323 | 115k | int16_t *ext_c = ctx->data_ptr[COEFF_CHROMA_EXT]; |
324 | 115k | const int ystride = ctx->frame->linesize[0]; |
325 | | |
326 | 115k | if (last_row) { |
327 | 297 | y_pos = (ctx->avctx->height - 16); |
328 | 297 | c_pos = ((ctx->avctx->height+1)/2 - 8); |
329 | 115k | } else { |
330 | 115k | y_pos = mb_y * 16; |
331 | 115k | c_pos = mb_y * 8; |
332 | 115k | } |
333 | | |
334 | 115k | Y = ctx->frame->data[0] + mb_x * 16 + y_pos * ystride; |
335 | 347k | for (i = 0; i < 2; i++) |
336 | 231k | C[i] = ctx->frame->data[i + 1] + mb_x * 8 |
337 | 231k | + c_pos * ctx->frame->linesize[i + 1]; |
338 | 115k | init_get_bits(&gb, src, src_size * 8); |
339 | | |
340 | 115k | memset(ctx->slice_data, 0, |
341 | 115k | sizeof(*ctx->slice_data) * slice_width * AIC_BAND_COEFFS); |
342 | 574k | for (i = 0; i < NUM_BANDS; i++) |
343 | 460k | if ((ret = aic_decode_coeffs(&gb, ctx->data_ptr[i], |
344 | 460k | i, slice_width, |
345 | 460k | !ctx->interlaced)) < 0) |
346 | 1.58k | return ret; |
347 | | |
348 | 244k | for (mb = 0; mb < slice_width; mb++) { |
349 | 651k | for (blk = 0; blk < 4; blk++) { |
350 | 521k | if (!ctx->interlaced) |
351 | 500k | recombine_block(ctx->block, ctx->idsp.idct_permutation, |
352 | 500k | &base_y, &ext_y); |
353 | 21.4k | else |
354 | 21.4k | recombine_block_il(ctx->block, ctx->idsp.idct_permutation, |
355 | 21.4k | &base_y, &ext_y, blk); |
356 | 521k | unquant_block(ctx->block, ctx->quant, ctx->quant_matrix); |
357 | 521k | ctx->idsp.idct(ctx->block); |
358 | | |
359 | 521k | if (!ctx->interlaced) { |
360 | 500k | dst = Y + (blk >> 1) * 8 * ystride + (blk & 1) * 8; |
361 | 500k | ctx->idsp.put_signed_pixels_clamped(ctx->block, dst, ystride); |
362 | 500k | } else { |
363 | 21.4k | dst = Y + (blk & 1) * 8 + (blk >> 1) * ystride; |
364 | 21.4k | ctx->idsp.put_signed_pixels_clamped(ctx->block, dst, |
365 | 21.4k | ystride * 2); |
366 | 21.4k | } |
367 | 521k | } |
368 | 130k | Y += 16; |
369 | | |
370 | 391k | for (blk = 0; blk < 2; blk++) { |
371 | 260k | recombine_block(ctx->block, ctx->idsp.idct_permutation, |
372 | 260k | &base_c, &ext_c); |
373 | 260k | unquant_block(ctx->block, ctx->quant, ctx->quant_matrix); |
374 | 260k | ctx->idsp.idct(ctx->block); |
375 | 260k | ctx->idsp.put_signed_pixels_clamped(ctx->block, C[blk], |
376 | 260k | ctx->frame->linesize[blk + 1]); |
377 | 260k | C[blk] += 8; |
378 | 260k | } |
379 | 130k | } |
380 | | |
381 | 114k | return 0; |
382 | 115k | } |
383 | | |
384 | | static int aic_decode_frame(AVCodecContext *avctx, AVFrame *frame, |
385 | | int *got_frame, AVPacket *avpkt) |
386 | 582k | { |
387 | 582k | AICContext *ctx = avctx->priv_data; |
388 | 582k | const uint8_t *buf = avpkt->data; |
389 | 582k | int buf_size = avpkt->size; |
390 | 582k | GetByteContext gb; |
391 | 582k | uint32_t off; |
392 | 582k | int x, y, ret; |
393 | 582k | int slice_size; |
394 | | |
395 | 582k | ctx->frame = frame; |
396 | | |
397 | 582k | off = FFALIGN(AIC_HDR_SIZE + ctx->num_x_slices * ctx->mb_height * 2, 4); |
398 | | |
399 | 582k | if (buf_size < off) { |
400 | 454k | av_log(avctx, AV_LOG_ERROR, "Too small frame\n"); |
401 | 454k | return AVERROR_INVALIDDATA; |
402 | 454k | } |
403 | | |
404 | 127k | ret = aic_decode_header(ctx, buf, buf_size); |
405 | 127k | if (ret < 0) { |
406 | 7.64k | av_log(avctx, AV_LOG_ERROR, "Invalid header\n"); |
407 | 7.64k | return ret; |
408 | 7.64k | } |
409 | | |
410 | 119k | if ((ret = ff_thread_get_buffer(avctx, ctx->frame, 0)) < 0) |
411 | 490 | return ret; |
412 | | |
413 | 118k | bytestream2_init(&gb, buf + AIC_HDR_SIZE, |
414 | 118k | ctx->num_x_slices * ctx->mb_height * 2); |
415 | | |
416 | 232k | for (y = 0; y < ctx->mb_height; y++) { |
417 | 234k | for (x = 0; x < ctx->mb_width; x += ctx->slice_width) { |
418 | 120k | slice_size = bytestream2_get_le16(&gb) * 4; |
419 | 120k | if (slice_size + off > buf_size || !slice_size) { |
420 | 4.12k | av_log(avctx, AV_LOG_ERROR, |
421 | 4.12k | "Incorrect slice size %d at %d.%d\n", slice_size, x, y); |
422 | 4.12k | return AVERROR_INVALIDDATA; |
423 | 4.12k | } |
424 | | |
425 | 115k | ret = aic_decode_slice(ctx, x, y, buf + off, slice_size); |
426 | 115k | if (ret < 0) { |
427 | 1.58k | av_log(avctx, AV_LOG_ERROR, |
428 | 1.58k | "Error decoding slice at %d.%d\n", x, y); |
429 | 1.58k | return ret; |
430 | 1.58k | } |
431 | | |
432 | 114k | off += slice_size; |
433 | 114k | } |
434 | 119k | } |
435 | | |
436 | 113k | *got_frame = 1; |
437 | | |
438 | 113k | return avpkt->size; |
439 | 118k | } |
440 | | |
441 | | static av_cold int aic_decode_init(AVCodecContext *avctx) |
442 | 1.26k | { |
443 | 1.26k | AICContext *ctx = avctx->priv_data; |
444 | 1.26k | int i; |
445 | | |
446 | 1.26k | ctx->avctx = avctx; |
447 | | |
448 | 1.26k | avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
449 | | |
450 | 1.26k | ff_idctdsp_init(&ctx->idsp, avctx); |
451 | | |
452 | 82.1k | for (i = 0; i < 64; i++) |
453 | 80.8k | ctx->quant_matrix[ctx->idsp.idct_permutation[i]] = aic_quant_matrix[i]; |
454 | | |
455 | 1.26k | ctx->mb_width = FFALIGN(avctx->width, 16) >> 4; |
456 | 1.26k | ctx->mb_height = FFALIGN(avctx->height, 16) >> 4; |
457 | | |
458 | 1.26k | ctx->num_x_slices = (ctx->mb_width + 15) >> 4; |
459 | 1.26k | ctx->slice_width = 16; |
460 | 1.45M | for (i = 1; i < ctx->mb_width; i++) { |
461 | 1.45M | if (!(ctx->mb_width % i) && (ctx->mb_width / i <= 32)) { |
462 | 519 | ctx->slice_width = ctx->mb_width / i; |
463 | 519 | ctx->num_x_slices = i; |
464 | 519 | break; |
465 | 519 | } |
466 | 1.45M | } |
467 | | |
468 | 1.26k | ctx->slice_data = av_calloc(ctx->slice_width, AIC_BAND_COEFFS * sizeof(*ctx->slice_data)); |
469 | 1.26k | if (!ctx->slice_data) { |
470 | 0 | av_log(avctx, AV_LOG_ERROR, "Error allocating slice buffer\n"); |
471 | |
|
472 | 0 | return AVERROR(ENOMEM); |
473 | 0 | } |
474 | | |
475 | 6.32k | for (i = 0; i < NUM_BANDS; i++) |
476 | 5.05k | ctx->data_ptr[i] = ctx->slice_data + ctx->slice_width |
477 | 5.05k | * aic_band_off[i]; |
478 | | |
479 | 1.26k | return 0; |
480 | 1.26k | } |
481 | | |
482 | | static av_cold int aic_decode_close(AVCodecContext *avctx) |
483 | 1.26k | { |
484 | 1.26k | AICContext *ctx = avctx->priv_data; |
485 | | |
486 | 1.26k | av_freep(&ctx->slice_data); |
487 | | |
488 | 1.26k | return 0; |
489 | 1.26k | } |
490 | | |
491 | | const FFCodec ff_aic_decoder = { |
492 | | .p.name = "aic", |
493 | | CODEC_LONG_NAME("Apple Intermediate Codec"), |
494 | | .p.type = AVMEDIA_TYPE_VIDEO, |
495 | | .p.id = AV_CODEC_ID_AIC, |
496 | | .priv_data_size = sizeof(AICContext), |
497 | | .init = aic_decode_init, |
498 | | .close = aic_decode_close, |
499 | | FF_CODEC_DECODE_CB(aic_decode_frame), |
500 | | .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS, |
501 | | }; |