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1 | /* |
2 | * Escape 130 video decoder | |
3 | * Copyright (C) 2008 Eli Friedman (eli.friedman <at> gmail.com) | |
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 "libavutil/attributes.h" | |
23 | #include "libavutil/mem.h" | |
24 | #include "avcodec.h" | |
25 | #define BITSTREAM_READER_LE | |
26 | #include "get_bits.h" | |
27 | #include "internal.h" | |
28 | ||
29 | typedef struct Escape130Context { | |
30 | uint8_t *old_y_avg; | |
31 | ||
32 | uint8_t *new_y, *old_y; | |
33 | uint8_t *new_u, *old_u; | |
34 | uint8_t *new_v, *old_v; | |
35 | ||
36 | uint8_t *buf1, *buf2; | |
37 | int linesize[3]; | |
38 | } Escape130Context; | |
39 | ||
40 | static const uint8_t offset_table[] = { 2, 4, 10, 20 }; | |
41 | static const int8_t sign_table[64][4] = { | |
42 | { 0, 0, 0, 0 }, | |
43 | { -1, 1, 0, 0 }, | |
44 | { 1, -1, 0, 0 }, | |
45 | { -1, 0, 1, 0 }, | |
46 | { -1, 1, 1, 0 }, | |
47 | { 0, -1, 1, 0 }, | |
48 | { 1, -1, 1, 0 }, | |
49 | { -1, -1, 1, 0 }, | |
50 | { 1, 0, -1, 0 }, | |
51 | { 0, 1, -1, 0 }, | |
52 | { 1, 1, -1, 0 }, | |
53 | { -1, 1, -1, 0 }, | |
54 | { 1, -1, -1, 0 }, | |
55 | { -1, 0, 0, 1 }, | |
56 | { -1, 1, 0, 1 }, | |
57 | { 0, -1, 0, 1 }, | |
58 | ||
59 | { 0, 0, 0, 0 }, | |
60 | { 1, -1, 0, 1 }, | |
61 | { -1, -1, 0, 1 }, | |
62 | { -1, 0, 1, 1 }, | |
63 | { -1, 1, 1, 1 }, | |
64 | { 0, -1, 1, 1 }, | |
65 | { 1, -1, 1, 1 }, | |
66 | { -1, -1, 1, 1 }, | |
67 | { 0, 0, -1, 1 }, | |
68 | { 1, 0, -1, 1 }, | |
69 | { -1, 0, -1, 1 }, | |
70 | { 0, 1, -1, 1 }, | |
71 | { 1, 1, -1, 1 }, | |
72 | { -1, 1, -1, 1 }, | |
73 | { 0, -1, -1, 1 }, | |
74 | { 1, -1, -1, 1 }, | |
75 | ||
76 | { 0, 0, 0, 0 }, | |
77 | { -1, -1, -1, 1 }, | |
78 | { 1, 0, 0, -1 }, | |
79 | { 0, 1, 0, -1 }, | |
80 | { 1, 1, 0, -1 }, | |
81 | { -1, 1, 0, -1 }, | |
82 | { 1, -1, 0, -1 }, | |
83 | { 0, 0, 1, -1 }, | |
84 | { 1, 0, 1, -1 }, | |
85 | { -1, 0, 1, -1 }, | |
86 | { 0, 1, 1, -1 }, | |
87 | { 1, 1, 1, -1 }, | |
88 | { -1, 1, 1, -1 }, | |
89 | { 0, -1, 1, -1 }, | |
90 | { 1, -1, 1, -1 }, | |
91 | { -1, -1, 1, -1 }, | |
92 | ||
93 | { 0, 0, 0, 0 }, | |
94 | { 1, 0, -1, -1 }, | |
95 | { 0, 1, -1, -1 }, | |
96 | { 1, 1, -1, -1 }, | |
97 | { -1, 1, -1, -1 }, | |
98 | { 1, -1, -1, -1 } | |
99 | }; | |
100 | ||
101 | static const int8_t luma_adjust[] = { -4, -3, -2, -1, 1, 2, 3, 4 }; | |
102 | ||
103 | static const int8_t chroma_adjust[2][8] = { | |
104 | { 1, 1, 0, -1, -1, -1, 0, 1 }, | |
105 | { 0, 1, 1, 1, 0, -1, -1, -1 } | |
106 | }; | |
107 | ||
108 | static const uint8_t chroma_vals[] = { | |
109 | 20, 28, 36, 44, 52, 60, 68, 76, | |
110 | 84, 92, 100, 106, 112, 116, 120, 124, | |
111 | 128, 132, 136, 140, 144, 150, 156, 164, | |
112 | 172, 180, 188, 196, 204, 212, 220, 228 | |
113 | }; | |
114 | ||
115 | static av_cold int escape130_decode_init(AVCodecContext *avctx) | |
116 | { | |
117 | Escape130Context *s = avctx->priv_data; | |
118 | avctx->pix_fmt = AV_PIX_FMT_YUV420P; | |
119 | ||
120 | if ((avctx->width & 1) || (avctx->height & 1)) { | |
121 | av_log(avctx, AV_LOG_ERROR, | |
122 | "Dimensions should be a multiple of two.\n"); | |
123 | return AVERROR_INVALIDDATA; | |
124 | } | |
125 | ||
126 | s->old_y_avg = av_malloc(avctx->width * avctx->height / 4); | |
127 | s->buf1 = av_malloc(avctx->width * avctx->height * 3 / 2); | |
128 | s->buf2 = av_malloc(avctx->width * avctx->height * 3 / 2); | |
129 | if (!s->old_y_avg || !s->buf1 || !s->buf2) { | |
130 | av_freep(&s->old_y_avg); | |
131 | av_freep(&s->buf1); | |
132 | av_freep(&s->buf2); | |
133 | av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n"); | |
134 | return AVERROR(ENOMEM); | |
135 | } | |
136 | ||
137 | s->linesize[0] = avctx->width; | |
138 | s->linesize[1] = | |
139 | s->linesize[2] = avctx->width / 2; | |
140 | ||
141 | s->new_y = s->buf1; | |
142 | s->new_u = s->new_y + avctx->width * avctx->height; | |
143 | s->new_v = s->new_u + avctx->width * avctx->height / 4; | |
144 | s->old_y = s->buf2; | |
145 | s->old_u = s->old_y + avctx->width * avctx->height; | |
146 | s->old_v = s->old_u + avctx->width * avctx->height / 4; | |
147 | memset(s->old_y, 0, avctx->width * avctx->height); | |
148 | memset(s->old_u, 0x10, avctx->width * avctx->height / 4); | |
149 | memset(s->old_v, 0x10, avctx->width * avctx->height / 4); | |
150 | ||
151 | return 0; | |
152 | } | |
153 | ||
154 | static av_cold int escape130_decode_close(AVCodecContext *avctx) | |
155 | { | |
156 | Escape130Context *s = avctx->priv_data; | |
157 | ||
158 | av_freep(&s->old_y_avg); | |
159 | av_freep(&s->buf1); | |
160 | av_freep(&s->buf2); | |
161 | ||
162 | return 0; | |
163 | } | |
164 | ||
165 | static int decode_skip_count(GetBitContext* gb) | |
166 | { | |
167 | int value; | |
168 | ||
169 | if (get_bits_left(gb) < 1+3) | |
170 | return -1; | |
171 | ||
172 | value = get_bits1(gb); | |
173 | if (value) | |
174 | return 0; | |
175 | ||
176 | value = get_bits(gb, 3); | |
177 | if (value) | |
178 | return value; | |
179 | ||
180 | value = get_bits(gb, 8); | |
181 | if (value) | |
182 | return value + 7; | |
183 | ||
184 | value = get_bits(gb, 15); | |
185 | if (value) | |
186 | return value + 262; | |
187 | ||
188 | return -1; | |
189 | } | |
190 | ||
191 | static int escape130_decode_frame(AVCodecContext *avctx, void *data, | |
192 | int *got_frame, AVPacket *avpkt) | |
193 | { | |
194 | int buf_size = avpkt->size; | |
195 | Escape130Context *s = avctx->priv_data; | |
196 | AVFrame *pic = data; | |
197 | GetBitContext gb; | |
198 | int ret; | |
199 | ||
200 | uint8_t *old_y, *old_cb, *old_cr, | |
201 | *new_y, *new_cb, *new_cr; | |
202 | uint8_t *dstY, *dstU, *dstV; | |
203 | unsigned old_y_stride, old_cb_stride, old_cr_stride, | |
204 | new_y_stride, new_cb_stride, new_cr_stride; | |
205 | unsigned total_blocks = avctx->width * avctx->height / 4, | |
206 | block_index, block_x = 0; | |
207 | unsigned y[4] = { 0 }, cb = 0x10, cr = 0x10; | |
208 | int skip = -1, y_avg = 0, i, j; | |
209 | uint8_t *ya = s->old_y_avg; | |
210 | ||
211 | // first 16 bytes are header; no useful information in here | |
212 | if (buf_size <= 16) { | |
213 | av_log(avctx, AV_LOG_ERROR, "Insufficient frame data\n"); | |
214 | return AVERROR_INVALIDDATA; | |
215 | } | |
216 | ||
217 | if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) | |
218 | return ret; | |
219 | ||
220 | if ((ret = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0) | |
221 | return ret; | |
222 | skip_bits_long(&gb, 16 * 8); | |
223 | ||
224 | new_y = s->new_y; | |
225 | new_cb = s->new_u; | |
226 | new_cr = s->new_v; | |
227 | new_y_stride = s->linesize[0]; | |
228 | new_cb_stride = s->linesize[1]; | |
229 | new_cr_stride = s->linesize[2]; | |
230 | old_y = s->old_y; | |
231 | old_cb = s->old_u; | |
232 | old_cr = s->old_v; | |
233 | old_y_stride = s->linesize[0]; | |
234 | old_cb_stride = s->linesize[1]; | |
235 | old_cr_stride = s->linesize[2]; | |
236 | ||
237 | for (block_index = 0; block_index < total_blocks; block_index++) { | |
238 | // Note that this call will make us skip the rest of the blocks | |
239 | // if the frame ends prematurely. | |
240 | if (skip == -1) | |
241 | skip = decode_skip_count(&gb); | |
242 | if (skip == -1) { | |
243 | av_log(avctx, AV_LOG_ERROR, "Error decoding skip value\n"); | |
244 | return AVERROR_INVALIDDATA; | |
245 | } | |
246 | ||
247 | if (skip) { | |
248 | y[0] = old_y[0]; | |
249 | y[1] = old_y[1]; | |
250 | y[2] = old_y[old_y_stride]; | |
251 | y[3] = old_y[old_y_stride + 1]; | |
252 | y_avg = ya[0]; | |
253 | cb = old_cb[0]; | |
254 | cr = old_cr[0]; | |
255 | } else { | |
256 | if (get_bits1(&gb)) { | |
257 | unsigned sign_selector = get_bits(&gb, 6); | |
258 | unsigned difference_selector = get_bits(&gb, 2); | |
259 | y_avg = 2 * get_bits(&gb, 5); | |
260 | for (i = 0; i < 4; i++) { | |
261 | y[i] = av_clip(y_avg + offset_table[difference_selector] * | |
262 | sign_table[sign_selector][i], 0, 63); | |
263 | } | |
264 | } else if (get_bits1(&gb)) { | |
265 | if (get_bits1(&gb)) { | |
266 | y_avg = get_bits(&gb, 6); | |
267 | } else { | |
268 | unsigned adjust_index = get_bits(&gb, 3); | |
269 | y_avg = (y_avg + luma_adjust[adjust_index]) & 63; | |
270 | } | |
271 | for (i = 0; i < 4; i++) | |
272 | y[i] = y_avg; | |
273 | } | |
274 | ||
275 | if (get_bits1(&gb)) { | |
276 | if (get_bits1(&gb)) { | |
277 | cb = get_bits(&gb, 5); | |
278 | cr = get_bits(&gb, 5); | |
279 | } else { | |
280 | unsigned adjust_index = get_bits(&gb, 3); | |
281 | cb = (cb + chroma_adjust[0][adjust_index]) & 31; | |
282 | cr = (cr + chroma_adjust[1][adjust_index]) & 31; | |
283 | } | |
284 | } | |
285 | } | |
286 | *ya++ = y_avg; | |
287 | ||
288 | new_y[0] = y[0]; | |
289 | new_y[1] = y[1]; | |
290 | new_y[new_y_stride] = y[2]; | |
291 | new_y[new_y_stride + 1] = y[3]; | |
292 | *new_cb = cb; | |
293 | *new_cr = cr; | |
294 | ||
295 | old_y += 2; | |
296 | old_cb++; | |
297 | old_cr++; | |
298 | new_y += 2; | |
299 | new_cb++; | |
300 | new_cr++; | |
301 | block_x++; | |
302 | if (block_x * 2 == avctx->width) { | |
303 | block_x = 0; | |
304 | old_y += old_y_stride * 2 - avctx->width; | |
305 | old_cb += old_cb_stride - avctx->width / 2; | |
306 | old_cr += old_cr_stride - avctx->width / 2; | |
307 | new_y += new_y_stride * 2 - avctx->width; | |
308 | new_cb += new_cb_stride - avctx->width / 2; | |
309 | new_cr += new_cr_stride - avctx->width / 2; | |
310 | } | |
311 | ||
312 | skip--; | |
313 | } | |
314 | ||
315 | new_y = s->new_y; | |
316 | new_cb = s->new_u; | |
317 | new_cr = s->new_v; | |
318 | dstY = pic->data[0]; | |
319 | dstU = pic->data[1]; | |
320 | dstV = pic->data[2]; | |
321 | for (j = 0; j < avctx->height; j++) { | |
322 | for (i = 0; i < avctx->width; i++) | |
323 | dstY[i] = new_y[i] << 2; | |
324 | dstY += pic->linesize[0]; | |
325 | new_y += new_y_stride; | |
326 | } | |
327 | for (j = 0; j < avctx->height / 2; j++) { | |
328 | for (i = 0; i < avctx->width / 2; i++) { | |
329 | dstU[i] = chroma_vals[new_cb[i]]; | |
330 | dstV[i] = chroma_vals[new_cr[i]]; | |
331 | } | |
332 | dstU += pic->linesize[1]; | |
333 | dstV += pic->linesize[2]; | |
334 | new_cb += new_cb_stride; | |
335 | new_cr += new_cr_stride; | |
336 | } | |
337 | ||
338 | av_dlog(avctx, "Frame data: provided %d bytes, used %d bytes\n", | |
339 | buf_size, get_bits_count(&gb) >> 3); | |
340 | ||
341 | FFSWAP(uint8_t*, s->old_y, s->new_y); | |
342 | FFSWAP(uint8_t*, s->old_u, s->new_u); | |
343 | FFSWAP(uint8_t*, s->old_v, s->new_v); | |
344 | ||
345 | *got_frame = 1; | |
346 | ||
347 | return buf_size; | |
348 | } | |
349 | ||
350 | AVCodec ff_escape130_decoder = { | |
351 | .name = "escape130", | |
352 | .long_name = NULL_IF_CONFIG_SMALL("Escape 130"), | |
353 | .type = AVMEDIA_TYPE_VIDEO, | |
354 | .id = AV_CODEC_ID_ESCAPE130, | |
355 | .priv_data_size = sizeof(Escape130Context), | |
356 | .init = escape130_decode_init, | |
357 | .close = escape130_decode_close, | |
358 | .decode = escape130_decode_frame, | |
359 | .capabilities = CODEC_CAP_DR1, | |
360 | }; |