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1 | /* |
2 | * Copyright (C) 2005 Ole André Vadla Ravnås <oleavr@gmail.com> | |
3 | * Copyright (C) 2008 Ramiro Polla | |
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 | #include <stdlib.h> | |
23 | #include <string.h> | |
24 | #include <stdint.h> | |
25 | ||
26 | #include "avcodec.h" | |
27 | #include "blockdsp.h" | |
28 | #include "internal.h" | |
29 | #include "get_bits.h" | |
30 | #include "bytestream.h" | |
31 | #include "bswapdsp.h" | |
32 | #include "hpeldsp.h" | |
33 | #include "idctdsp.h" | |
34 | #include "thread.h" | |
35 | ||
36 | #define MIMIC_HEADER_SIZE 20 | |
37 | ||
38 | typedef struct { | |
39 | AVCodecContext *avctx; | |
40 | ||
41 | int num_vblocks[3]; | |
42 | int num_hblocks[3]; | |
43 | ||
44 | void *swap_buf; | |
45 | int swap_buf_size; | |
46 | ||
47 | int cur_index; | |
48 | int prev_index; | |
49 | ||
50 | ThreadFrame frames [16]; | |
51 | AVPicture flipped_ptrs[16]; | |
52 | ||
53 | DECLARE_ALIGNED(16, int16_t, dct_block)[64]; | |
54 | ||
55 | GetBitContext gb; | |
56 | ScanTable scantable; | |
57 | BlockDSPContext bdsp; | |
58 | BswapDSPContext bbdsp; | |
59 | HpelDSPContext hdsp; | |
60 | IDCTDSPContext idsp; | |
61 | VLC vlc; | |
62 | ||
63 | /* Kept in the context so multithreading can have a constant to read from */ | |
64 | int next_cur_index; | |
65 | int next_prev_index; | |
66 | } MimicContext; | |
67 | ||
68 | static const uint32_t huffcodes[] = { | |
69 | 0x0000000a, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, | |
70 | 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, | |
71 | 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x0000000b, | |
72 | 0x0000001b, 0x00000038, 0x00000078, 0x00000079, 0x0000007a, 0x000000f9, | |
73 | 0x000000fa, 0x000003fb, 0x000007f8, 0x000007f9, 0x000007fa, 0x000007fb, | |
74 | 0x00000ff8, 0x00000ff9, 0x00000001, 0x00000039, 0x0000007b, 0x000000fb, | |
75 | 0x000001f8, 0x000001f9, 0x00000ffa, 0x00000ffb, 0x00001ff8, 0x00001ff9, | |
76 | 0x00001ffa, 0x00001ffb, 0x00003ff8, 0x00003ff9, 0x00003ffa, 0x00000000, | |
77 | 0x00000004, 0x0000003a, 0x000001fa, 0x00003ffb, 0x00007ff8, 0x00007ff9, | |
78 | 0x00007ffa, 0x00007ffb, 0x0000fff8, 0x0000fff9, 0x0000fffa, 0x0000fffb, | |
79 | 0x0001fff8, 0x0001fff9, 0x0001fffa, 0x00000000, 0x0000000c, 0x000000f8, | |
80 | 0x000001fb, 0x0001fffb, 0x0003fff8, 0x0003fff9, 0x0003fffa, 0x0003fffb, | |
81 | 0x0007fff8, 0x0007fff9, 0x0007fffa, 0x0007fffb, 0x000ffff8, 0x000ffff9, | |
82 | 0x000ffffa, 0x00000000, 0x0000001a, 0x000003f8, 0x000ffffb, 0x001ffff8, | |
83 | 0x001ffff9, 0x001ffffa, 0x001ffffb, 0x003ffff8, 0x003ffff9, 0x003ffffa, | |
84 | 0x003ffffb, 0x007ffff8, 0x007ffff9, 0x007ffffa, 0x007ffffb, 0x00000000, | |
85 | 0x0000003b, 0x000003f9, 0x00fffff8, 0x00fffff9, 0x00fffffa, 0x00fffffb, | |
86 | 0x01fffff8, 0x01fffff9, 0x01fffffa, 0x01fffffb, 0x03fffff8, 0x03fffff9, | |
87 | 0x03fffffa, 0x03fffffb, 0x07fffff8, 0x00000000, 0x000003fa, 0x07fffff9, | |
88 | 0x07fffffa, 0x07fffffb, 0x0ffffff8, 0x0ffffff9, 0x0ffffffa, 0x0ffffffb, | |
89 | 0x1ffffff8, 0x1ffffff9, 0x1ffffffa, 0x1ffffffb, 0x3ffffff8, 0x3ffffff9, | |
90 | 0x3ffffffa, | |
91 | }; | |
92 | ||
93 | static const uint8_t huffbits[] = { | |
94 | 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
95 | 0, 0, 0, 0, 2, 4, 5, 6, 7, 7, 7, 8, | |
96 | 8, 10, 11, 11, 11, 11, 12, 12, 2, 6, 7, 8, | |
97 | 9, 9, 12, 12, 13, 13, 13, 13, 14, 14, 14, 0, | |
98 | 3, 6, 9, 14, 15, 15, 15, 15, 16, 16, 16, 16, | |
99 | 17, 17, 17, 0, 4, 8, 9, 17, 18, 18, 18, 18, | |
100 | 19, 19, 19, 19, 20, 20, 20, 0, 5, 10, 20, 21, | |
101 | 21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23, 0, | |
102 | 6, 10, 24, 24, 24, 24, 25, 25, 25, 25, 26, 26, | |
103 | 26, 26, 27, 0, 10, 27, 27, 27, 28, 28, 28, 28, | |
104 | 29, 29, 29, 29, 30, 30, 30, | |
105 | }; | |
106 | ||
107 | static const uint8_t col_zag[64] = { | |
108 | 0, 8, 1, 2, 9, 16, 24, 17, | |
109 | 10, 3, 4, 11, 18, 25, 32, 40, | |
110 | 33, 26, 19, 12, 5, 6, 13, 20, | |
111 | 27, 34, 41, 48, 56, 49, 42, 35, | |
112 | 28, 21, 14, 7, 15, 22, 29, 36, | |
113 | 43, 50, 57, 58, 51, 44, 37, 30, | |
114 | 23, 31, 38, 45, 52, 59, 39, 46, | |
115 | 53, 60, 61, 54, 47, 55, 62, 63, | |
116 | }; | |
117 | ||
118 | static av_cold int mimic_decode_end(AVCodecContext *avctx) | |
119 | { | |
120 | MimicContext *ctx = avctx->priv_data; | |
121 | int i; | |
122 | ||
123 | av_freep(&ctx->swap_buf); | |
124 | ctx->swap_buf_size = 0; | |
125 | ||
126 | for (i = 0; i < FF_ARRAY_ELEMS(ctx->frames); i++) { | |
127 | if (ctx->frames[i].f) | |
128 | ff_thread_release_buffer(avctx, &ctx->frames[i]); | |
129 | av_frame_free(&ctx->frames[i].f); | |
130 | } | |
131 | ||
132 | if (!avctx->internal->is_copy) | |
133 | ff_free_vlc(&ctx->vlc); | |
134 | ||
135 | return 0; | |
136 | } | |
137 | ||
138 | static av_cold int mimic_decode_init(AVCodecContext *avctx) | |
139 | { | |
140 | MimicContext *ctx = avctx->priv_data; | |
141 | int ret, i; | |
142 | ||
143 | avctx->internal->allocate_progress = 1; | |
144 | ||
145 | ctx->prev_index = 0; | |
146 | ctx->cur_index = 15; | |
147 | ||
148 | if ((ret = init_vlc(&ctx->vlc, 11, FF_ARRAY_ELEMS(huffbits), | |
149 | huffbits, 1, 1, huffcodes, 4, 4, 0)) < 0) { | |
150 | av_log(avctx, AV_LOG_ERROR, "error initializing vlc table\n"); | |
151 | return ret; | |
152 | } | |
153 | ff_blockdsp_init(&ctx->bdsp, avctx); | |
154 | ff_bswapdsp_init(&ctx->bbdsp); | |
155 | ff_hpeldsp_init(&ctx->hdsp, avctx->flags); | |
156 | ff_idctdsp_init(&ctx->idsp, avctx); | |
157 | ff_init_scantable(ctx->idsp.idct_permutation, &ctx->scantable, col_zag); | |
158 | ||
159 | for (i = 0; i < FF_ARRAY_ELEMS(ctx->frames); i++) { | |
160 | ctx->frames[i].f = av_frame_alloc(); | |
161 | if (!ctx->frames[i].f) { | |
162 | mimic_decode_end(avctx); | |
163 | return AVERROR(ENOMEM); | |
164 | } | |
165 | } | |
166 | ||
167 | return 0; | |
168 | } | |
169 | ||
170 | static int mimic_decode_update_thread_context(AVCodecContext *avctx, const AVCodecContext *avctx_from) | |
171 | { | |
172 | MimicContext *dst = avctx->priv_data, *src = avctx_from->priv_data; | |
173 | int i, ret; | |
174 | ||
175 | if (avctx == avctx_from) | |
176 | return 0; | |
177 | ||
178 | dst->cur_index = src->next_cur_index; | |
179 | dst->prev_index = src->next_prev_index; | |
180 | ||
181 | memcpy(dst->flipped_ptrs, src->flipped_ptrs, sizeof(src->flipped_ptrs)); | |
182 | ||
183 | for (i = 0; i < FF_ARRAY_ELEMS(dst->frames); i++) { | |
184 | ff_thread_release_buffer(avctx, &dst->frames[i]); | |
185 | if (i != src->next_cur_index && src->frames[i].f->data[0]) { | |
186 | ret = ff_thread_ref_frame(&dst->frames[i], &src->frames[i]); | |
187 | if (ret < 0) | |
188 | return ret; | |
189 | } | |
190 | } | |
191 | ||
192 | return 0; | |
193 | } | |
194 | ||
195 | static const int8_t vlcdec_lookup[9][64] = { | |
196 | { 0, }, | |
197 | { -1, 1, }, | |
198 | { -3, 3, -2, 2, }, | |
199 | { -7, 7, -6, 6, -5, 5, -4, 4, }, | |
200 | { -15, 15, -14, 14, -13, 13, -12, 12, | |
201 | -11, 11, -10, 10, -9, 9, -8, 8, }, | |
202 | { -31, 31, -30, 30, -29, 29, -28, 28, | |
203 | -27, 27, -26, 26, -25, 25, -24, 24, | |
204 | -23, 23, -22, 22, -21, 21, -20, 20, | |
205 | -19, 19, -18, 18, -17, 17, -16, 16, }, | |
206 | { -63, 63, -62, 62, -61, 61, -60, 60, | |
207 | -59, 59, -58, 58, -57, 57, -56, 56, | |
208 | -55, 55, -54, 54, -53, 53, -52, 52, | |
209 | -51, 51, -50, 50, -49, 49, -48, 48, | |
210 | -47, 47, -46, 46, -45, 45, -44, 44, | |
211 | -43, 43, -42, 42, -41, 41, -40, 40, | |
212 | -39, 39, -38, 38, -37, 37, -36, 36, | |
213 | -35, 35, -34, 34, -33, 33, -32, 32, }, | |
214 | { -127, 127, -126, 126, -125, 125, -124, 124, | |
215 | -123, 123, -122, 122, -121, 121, -120, 120, | |
216 | -119, 119, -118, 118, -117, 117, -116, 116, | |
217 | -115, 115, -114, 114, -113, 113, -112, 112, | |
218 | -111, 111, -110, 110, -109, 109, -108, 108, | |
219 | -107, 107, -106, 106, -105, 105, -104, 104, | |
220 | -103, 103, -102, 102, -101, 101, -100, 100, | |
221 | -99, 99, -98, 98, -97, 97, -96, 96, }, | |
222 | { -95, 95, -94, 94, -93, 93, -92, 92, | |
223 | -91, 91, -90, 90, -89, 89, -88, 88, | |
224 | -87, 87, -86, 86, -85, 85, -84, 84, | |
225 | -83, 83, -82, 82, -81, 81, -80, 80, | |
226 | -79, 79, -78, 78, -77, 77, -76, 76, | |
227 | -75, 75, -74, 74, -73, 73, -72, 72, | |
228 | -71, 71, -70, 70, -69, 69, -68, 68, | |
229 | -67, 67, -66, 66, -65, 65, -64, 64, }, | |
230 | }; | |
231 | ||
232 | static int vlc_decode_block(MimicContext *ctx, int num_coeffs, int qscale) | |
233 | { | |
234 | int16_t *block = ctx->dct_block; | |
235 | unsigned int pos; | |
236 | ||
237 | ctx->bdsp.clear_block(block); | |
238 | ||
239 | block[0] = get_bits(&ctx->gb, 8) << 3; | |
240 | ||
241 | for (pos = 1; pos < num_coeffs; pos++) { | |
242 | uint32_t vlc, num_bits; | |
243 | int value; | |
244 | int coeff; | |
245 | ||
246 | vlc = get_vlc2(&ctx->gb, ctx->vlc.table, ctx->vlc.bits, 3); | |
247 | if (!vlc) /* end-of-block code */ | |
248 | return 0; | |
249 | if (vlc == -1) | |
250 | return AVERROR_INVALIDDATA; | |
251 | ||
252 | /* pos_add and num_bits are coded in the vlc code */ | |
253 | pos += vlc & 15; // pos_add | |
254 | num_bits = vlc >> 4; // num_bits | |
255 | ||
256 | if (pos >= 64) | |
257 | return AVERROR_INVALIDDATA; | |
258 | ||
259 | value = get_bits(&ctx->gb, num_bits); | |
260 | ||
261 | /* FFmpeg's IDCT behaves somewhat different from the original code, so | |
262 | * a factor of 4 was added to the input */ | |
263 | ||
264 | coeff = vlcdec_lookup[num_bits][value]; | |
265 | if (pos < 3) | |
266 | coeff <<= 4; | |
267 | else /* TODO Use >> 10 instead of / 1001 */ | |
268 | coeff = (coeff * qscale) / 1001; | |
269 | ||
270 | block[ctx->scantable.permutated[pos]] = coeff; | |
271 | } | |
272 | ||
273 | return 0; | |
274 | } | |
275 | ||
276 | static int decode(MimicContext *ctx, int quality, int num_coeffs, | |
277 | int is_iframe) | |
278 | { | |
279 | int ret, y, x, plane, cur_row = 0; | |
280 | ||
281 | for (plane = 0; plane < 3; plane++) { | |
282 | const int is_chroma = !!plane; | |
283 | const int qscale = av_clip(10000 - quality, is_chroma ? 1000 : 2000, | |
284 | 10000) << 2; | |
285 | const int stride = ctx->flipped_ptrs[ctx->cur_index ].linesize[plane]; | |
286 | const uint8_t *src = ctx->flipped_ptrs[ctx->prev_index].data[plane]; | |
287 | uint8_t *dst = ctx->flipped_ptrs[ctx->cur_index ].data[plane]; | |
288 | ||
289 | for (y = 0; y < ctx->num_vblocks[plane]; y++) { | |
290 | for (x = 0; x < ctx->num_hblocks[plane]; x++) { | |
291 | /* Check for a change condition in the current block. | |
292 | * - iframes always change. | |
293 | * - Luma plane changes on get_bits1 == 0 | |
294 | * - Chroma planes change on get_bits1 == 1 */ | |
295 | if (is_iframe || get_bits1(&ctx->gb) == is_chroma) { | |
296 | /* Luma planes may use a backreference from the 15 last | |
297 | * frames preceding the previous. (get_bits1 == 1) | |
298 | * Chroma planes don't use backreferences. */ | |
299 | if (is_chroma || is_iframe || !get_bits1(&ctx->gb)) { | |
300 | if ((ret = vlc_decode_block(ctx, num_coeffs, | |
301 | qscale)) < 0) { | |
302 | av_log(ctx->avctx, AV_LOG_ERROR, "Error decoding " | |
303 | "block.\n"); | |
304 | return ret; | |
305 | } | |
306 | ctx->idsp.idct_put(dst, stride, ctx->dct_block); | |
307 | } else { | |
308 | unsigned int backref = get_bits(&ctx->gb, 4); | |
309 | int index = (ctx->cur_index + backref) & 15; | |
310 | uint8_t *p = ctx->flipped_ptrs[index].data[0]; | |
311 | ||
312 | if (index != ctx->cur_index && p) { | |
313 | ff_thread_await_progress(&ctx->frames[index], | |
314 | cur_row, 0); | |
315 | p += src - | |
316 | ctx->flipped_ptrs[ctx->prev_index].data[plane]; | |
317 | ctx->hdsp.put_pixels_tab[1][0](dst, p, stride, 8); | |
318 | } else { | |
319 | av_log(ctx->avctx, AV_LOG_ERROR, | |
320 | "No such backreference! Buggy sample.\n"); | |
321 | } | |
322 | } | |
323 | } else { | |
324 | ff_thread_await_progress(&ctx->frames[ctx->prev_index], | |
325 | cur_row, 0); | |
326 | ctx->hdsp.put_pixels_tab[1][0](dst, src, stride, 8); | |
327 | } | |
328 | src += 8; | |
329 | dst += 8; | |
330 | } | |
331 | src += (stride - ctx->num_hblocks[plane]) << 3; | |
332 | dst += (stride - ctx->num_hblocks[plane]) << 3; | |
333 | ||
334 | ff_thread_report_progress(&ctx->frames[ctx->cur_index], | |
335 | cur_row++, 0); | |
336 | } | |
337 | } | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
342 | /** | |
343 | * Flip the buffer upside-down and put it in the YVU order to match the | |
344 | * way Mimic encodes frames. | |
345 | */ | |
346 | static void prepare_avpic(MimicContext *ctx, AVPicture *dst, AVFrame *src) | |
347 | { | |
348 | int i; | |
349 | dst->data[0] = src->data[0] + ( ctx->avctx->height - 1) * src->linesize[0]; | |
350 | dst->data[1] = src->data[2] + ((ctx->avctx->height >> 1) - 1) * src->linesize[2]; | |
351 | dst->data[2] = src->data[1] + ((ctx->avctx->height >> 1) - 1) * src->linesize[1]; | |
352 | for (i = 0; i < 3; i++) | |
353 | dst->linesize[i] = -src->linesize[i]; | |
354 | } | |
355 | ||
356 | static int mimic_decode_frame(AVCodecContext *avctx, void *data, | |
357 | int *got_frame, AVPacket *avpkt) | |
358 | { | |
359 | const uint8_t *buf = avpkt->data; | |
360 | int buf_size = avpkt->size; | |
361 | int swap_buf_size = buf_size - MIMIC_HEADER_SIZE; | |
362 | MimicContext *ctx = avctx->priv_data; | |
363 | GetByteContext gb; | |
364 | int is_pframe; | |
365 | int width, height; | |
366 | int quality, num_coeffs; | |
367 | int res; | |
368 | ||
369 | if (buf_size <= MIMIC_HEADER_SIZE) { | |
370 | av_log(avctx, AV_LOG_ERROR, "insufficient data\n"); | |
371 | return AVERROR_INVALIDDATA; | |
372 | } | |
373 | ||
374 | bytestream2_init(&gb, buf, MIMIC_HEADER_SIZE); | |
375 | bytestream2_skip(&gb, 2); /* some constant (always 256) */ | |
376 | quality = bytestream2_get_le16u(&gb); | |
377 | width = bytestream2_get_le16u(&gb); | |
378 | height = bytestream2_get_le16u(&gb); | |
379 | bytestream2_skip(&gb, 4); /* some constant */ | |
380 | is_pframe = bytestream2_get_le32u(&gb); | |
381 | num_coeffs = bytestream2_get_byteu(&gb); | |
382 | bytestream2_skip(&gb, 3); /* some constant */ | |
383 | ||
384 | if (!ctx->avctx) { | |
385 | int i; | |
386 | ||
387 | if (!(width == 160 && height == 120) && | |
388 | !(width == 320 && height == 240)) { | |
389 | av_log(avctx, AV_LOG_ERROR, "invalid width/height!\n"); | |
390 | return AVERROR_INVALIDDATA; | |
391 | } | |
392 | ||
393 | ctx->avctx = avctx; | |
394 | avctx->width = width; | |
395 | avctx->height = height; | |
396 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; | |
397 | for (i = 0; i < 3; i++) { | |
398 | ctx->num_vblocks[i] = FF_CEIL_RSHIFT(height, 3 + !!i); | |
399 | ctx->num_hblocks[i] = width >> (3 + !!i); | |
400 | } | |
401 | } else if (width != ctx->avctx->width || height != ctx->avctx->height) { | |
402 | avpriv_request_sample(avctx, "Resolution changing"); | |
403 | return AVERROR_PATCHWELCOME; | |
404 | } | |
405 | ||
406 | if (is_pframe && !ctx->frames[ctx->prev_index].f->data[0]) { | |
407 | av_log(avctx, AV_LOG_ERROR, "decoding must start with keyframe\n"); | |
408 | return AVERROR_INVALIDDATA; | |
409 | } | |
410 | ||
411 | ff_thread_release_buffer(avctx, &ctx->frames[ctx->cur_index]); | |
412 | ctx->frames[ctx->cur_index].f->pict_type = is_pframe ? AV_PICTURE_TYPE_P : | |
413 | AV_PICTURE_TYPE_I; | |
414 | if ((res = ff_thread_get_buffer(avctx, &ctx->frames[ctx->cur_index], | |
415 | AV_GET_BUFFER_FLAG_REF)) < 0) | |
416 | return res; | |
417 | ||
418 | ctx->next_prev_index = ctx->cur_index; | |
419 | ctx->next_cur_index = (ctx->cur_index - 1) & 15; | |
420 | ||
421 | prepare_avpic(ctx, &ctx->flipped_ptrs[ctx->cur_index], | |
422 | ctx->frames[ctx->cur_index].f); | |
423 | ||
424 | ff_thread_finish_setup(avctx); | |
425 | ||
426 | av_fast_padded_malloc(&ctx->swap_buf, &ctx->swap_buf_size, swap_buf_size); | |
427 | if (!ctx->swap_buf) | |
428 | return AVERROR(ENOMEM); | |
429 | ||
430 | ctx->bbdsp.bswap_buf(ctx->swap_buf, | |
431 | (const uint32_t *) (buf + MIMIC_HEADER_SIZE), | |
432 | swap_buf_size >> 2); | |
433 | init_get_bits(&ctx->gb, ctx->swap_buf, swap_buf_size << 3); | |
434 | ||
435 | res = decode(ctx, quality, num_coeffs, !is_pframe); | |
436 | ff_thread_report_progress(&ctx->frames[ctx->cur_index], INT_MAX, 0); | |
437 | if (res < 0) { | |
438 | if (!(avctx->active_thread_type & FF_THREAD_FRAME)) { | |
439 | ff_thread_release_buffer(avctx, &ctx->frames[ctx->cur_index]); | |
440 | return res; | |
441 | } | |
442 | } | |
443 | ||
444 | if ((res = av_frame_ref(data, ctx->frames[ctx->cur_index].f)) < 0) | |
445 | return res; | |
446 | *got_frame = 1; | |
447 | ||
448 | ctx->prev_index = ctx->next_prev_index; | |
449 | ctx->cur_index = ctx->next_cur_index; | |
450 | ||
451 | /* Only release frames that aren't used for backreferences anymore */ | |
452 | ff_thread_release_buffer(avctx, &ctx->frames[ctx->cur_index]); | |
453 | ||
454 | return buf_size; | |
455 | } | |
456 | ||
457 | static av_cold int mimic_init_thread_copy(AVCodecContext *avctx) | |
458 | { | |
459 | MimicContext *ctx = avctx->priv_data; | |
460 | int i; | |
461 | ||
462 | for (i = 0; i < FF_ARRAY_ELEMS(ctx->frames); i++) { | |
463 | ctx->frames[i].f = av_frame_alloc(); | |
464 | if (!ctx->frames[i].f) { | |
465 | mimic_decode_end(avctx); | |
466 | return AVERROR(ENOMEM); | |
467 | } | |
468 | } | |
469 | ||
470 | return 0; | |
471 | } | |
472 | ||
473 | AVCodec ff_mimic_decoder = { | |
474 | .name = "mimic", | |
475 | .long_name = NULL_IF_CONFIG_SMALL("Mimic"), | |
476 | .type = AVMEDIA_TYPE_VIDEO, | |
477 | .id = AV_CODEC_ID_MIMIC, | |
478 | .priv_data_size = sizeof(MimicContext), | |
479 | .init = mimic_decode_init, | |
480 | .close = mimic_decode_end, | |
481 | .decode = mimic_decode_frame, | |
482 | .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS, | |
483 | .update_thread_context = ONLY_IF_THREADS_ENABLED(mimic_decode_update_thread_context), | |
484 | .init_thread_copy = ONLY_IF_THREADS_ENABLED(mimic_init_thread_copy), | |
485 | }; |