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1 | /* |
2 | * Canopus Lossless Codec decoder | |
3 | * | |
4 | * Copyright (c) 2012-2013 Derek Buitenhuis | |
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/intreadwrite.h" | |
26 | #include "bswapdsp.h" | |
27 | #include "get_bits.h" | |
28 | #include "avcodec.h" | |
29 | #include "internal.h" | |
30 | ||
31 | typedef struct CLLCContext { | |
32 | AVCodecContext *avctx; | |
33 | BswapDSPContext bdsp; | |
34 | ||
35 | uint8_t *swapped_buf; | |
36 | int swapped_buf_size; | |
37 | } CLLCContext; | |
38 | ||
39 | static int read_code_table(CLLCContext *ctx, GetBitContext *gb, VLC *vlc) | |
40 | { | |
41 | uint8_t symbols[256]; | |
42 | uint8_t bits[256]; | |
43 | uint16_t codes[256]; | |
44 | int num_lens, num_codes, num_codes_sum, prefix; | |
45 | int i, j, count; | |
46 | ||
47 | prefix = 0; | |
48 | count = 0; | |
49 | num_codes_sum = 0; | |
50 | ||
51 | num_lens = get_bits(gb, 5); | |
52 | ||
53 | for (i = 0; i < num_lens; i++) { | |
54 | num_codes = get_bits(gb, 9); | |
55 | num_codes_sum += num_codes; | |
56 | ||
57 | if (num_codes_sum > 256) { | |
58 | vlc->table = NULL; | |
59 | ||
60 | av_log(ctx->avctx, AV_LOG_ERROR, | |
61 | "Too many VLCs (%d) to be read.\n", num_codes_sum); | |
62 | return AVERROR_INVALIDDATA; | |
63 | } | |
64 | ||
65 | for (j = 0; j < num_codes; j++) { | |
66 | symbols[count] = get_bits(gb, 8); | |
67 | bits[count] = i + 1; | |
68 | codes[count] = prefix++; | |
69 | ||
70 | count++; | |
71 | } | |
72 | ||
73 | prefix <<= 1; | |
74 | } | |
75 | ||
76 | return ff_init_vlc_sparse(vlc, 7, count, bits, 1, 1, | |
77 | codes, 2, 2, symbols, 1, 1, 0); | |
78 | } | |
79 | ||
80 | /* | |
81 | * Unlike the RGB24 read/restore, which reads in a component at a time, | |
82 | * ARGB read/restore reads in ARGB quads. | |
83 | */ | |
84 | static int read_argb_line(CLLCContext *ctx, GetBitContext *gb, int *top_left, | |
85 | VLC *vlc, uint8_t *outbuf) | |
86 | { | |
87 | uint8_t *dst; | |
88 | int pred[4]; | |
89 | int code; | |
90 | int i; | |
91 | ||
92 | OPEN_READER(bits, gb); | |
93 | ||
94 | dst = outbuf; | |
95 | pred[0] = top_left[0]; | |
96 | pred[1] = top_left[1]; | |
97 | pred[2] = top_left[2]; | |
98 | pred[3] = top_left[3]; | |
99 | ||
100 | for (i = 0; i < ctx->avctx->width; i++) { | |
101 | /* Always get the alpha component */ | |
102 | UPDATE_CACHE(bits, gb); | |
103 | GET_VLC(code, bits, gb, vlc[0].table, 7, 2); | |
104 | ||
105 | pred[0] += code; | |
106 | dst[0] = pred[0]; | |
107 | ||
108 | /* Skip the components if they are entirely transparent */ | |
109 | if (dst[0]) { | |
110 | /* Red */ | |
111 | UPDATE_CACHE(bits, gb); | |
112 | GET_VLC(code, bits, gb, vlc[1].table, 7, 2); | |
113 | ||
114 | pred[1] += code; | |
115 | dst[1] = pred[1]; | |
116 | ||
117 | /* Green */ | |
118 | UPDATE_CACHE(bits, gb); | |
119 | GET_VLC(code, bits, gb, vlc[2].table, 7, 2); | |
120 | ||
121 | pred[2] += code; | |
122 | dst[2] = pred[2]; | |
123 | ||
124 | /* Blue */ | |
125 | UPDATE_CACHE(bits, gb); | |
126 | GET_VLC(code, bits, gb, vlc[3].table, 7, 2); | |
127 | ||
128 | pred[3] += code; | |
129 | dst[3] = pred[3]; | |
130 | } else { | |
131 | dst[1] = 0; | |
132 | dst[2] = 0; | |
133 | dst[3] = 0; | |
134 | } | |
135 | ||
136 | dst += 4; | |
137 | } | |
138 | ||
139 | CLOSE_READER(bits, gb); | |
140 | ||
141 | top_left[0] = outbuf[0]; | |
142 | ||
143 | /* Only stash components if they are not transparent */ | |
144 | if (top_left[0]) { | |
145 | top_left[1] = outbuf[1]; | |
146 | top_left[2] = outbuf[2]; | |
147 | top_left[3] = outbuf[3]; | |
148 | } | |
149 | ||
150 | return 0; | |
151 | } | |
152 | ||
153 | static int read_rgb24_component_line(CLLCContext *ctx, GetBitContext *gb, | |
154 | int *top_left, VLC *vlc, uint8_t *outbuf) | |
155 | { | |
156 | uint8_t *dst; | |
157 | int pred, code; | |
158 | int i; | |
159 | ||
160 | OPEN_READER(bits, gb); | |
161 | ||
162 | dst = outbuf; | |
163 | pred = *top_left; | |
164 | ||
165 | /* Simultaneously read and restore the line */ | |
166 | for (i = 0; i < ctx->avctx->width; i++) { | |
167 | UPDATE_CACHE(bits, gb); | |
168 | GET_VLC(code, bits, gb, vlc->table, 7, 2); | |
169 | ||
170 | pred += code; | |
171 | dst[0] = pred; | |
172 | dst += 3; | |
173 | } | |
174 | ||
175 | CLOSE_READER(bits, gb); | |
176 | ||
177 | /* Stash the first pixel */ | |
178 | *top_left = outbuf[0]; | |
179 | ||
180 | return 0; | |
181 | } | |
182 | ||
183 | static int read_yuv_component_line(CLLCContext *ctx, GetBitContext *gb, | |
184 | int *top_left, VLC *vlc, uint8_t *outbuf, | |
185 | int is_chroma) | |
186 | { | |
187 | int pred, code; | |
188 | int i; | |
189 | ||
190 | OPEN_READER(bits, gb); | |
191 | ||
192 | pred = *top_left; | |
193 | ||
194 | /* Simultaneously read and restore the line */ | |
195 | for (i = 0; i < ctx->avctx->width >> is_chroma; i++) { | |
196 | UPDATE_CACHE(bits, gb); | |
197 | GET_VLC(code, bits, gb, vlc->table, 7, 2); | |
198 | ||
199 | pred += code; | |
200 | outbuf[i] = pred; | |
201 | } | |
202 | ||
203 | CLOSE_READER(bits, gb); | |
204 | ||
205 | /* Stash the first pixel */ | |
206 | *top_left = outbuf[0]; | |
207 | ||
208 | return 0; | |
209 | } | |
210 | ||
211 | static int decode_argb_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic) | |
212 | { | |
213 | AVCodecContext *avctx = ctx->avctx; | |
214 | uint8_t *dst; | |
215 | int pred[4]; | |
216 | int ret; | |
217 | int i, j; | |
218 | VLC vlc[4]; | |
219 | ||
220 | pred[0] = 0; | |
221 | pred[1] = 0x80; | |
222 | pred[2] = 0x80; | |
223 | pred[3] = 0x80; | |
224 | ||
225 | dst = pic->data[0]; | |
226 | ||
227 | skip_bits(gb, 16); | |
228 | ||
229 | /* Read in code table for each plane */ | |
230 | for (i = 0; i < 4; i++) { | |
231 | ret = read_code_table(ctx, gb, &vlc[i]); | |
232 | if (ret < 0) { | |
233 | for (j = 0; j <= i; j++) | |
234 | ff_free_vlc(&vlc[j]); | |
235 | ||
236 | av_log(ctx->avctx, AV_LOG_ERROR, | |
237 | "Could not read code table %d.\n", i); | |
238 | return ret; | |
239 | } | |
240 | } | |
241 | ||
242 | /* Read in and restore every line */ | |
243 | for (i = 0; i < avctx->height; i++) { | |
244 | read_argb_line(ctx, gb, pred, vlc, dst); | |
245 | ||
246 | dst += pic->linesize[0]; | |
247 | } | |
248 | ||
249 | for (i = 0; i < 4; i++) | |
250 | ff_free_vlc(&vlc[i]); | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | static int decode_rgb24_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic) | |
256 | { | |
257 | AVCodecContext *avctx = ctx->avctx; | |
258 | uint8_t *dst; | |
259 | int pred[3]; | |
260 | int ret; | |
261 | int i, j; | |
262 | VLC vlc[3]; | |
263 | ||
264 | pred[0] = 0x80; | |
265 | pred[1] = 0x80; | |
266 | pred[2] = 0x80; | |
267 | ||
268 | dst = pic->data[0]; | |
269 | ||
270 | skip_bits(gb, 16); | |
271 | ||
272 | /* Read in code table for each plane */ | |
273 | for (i = 0; i < 3; i++) { | |
274 | ret = read_code_table(ctx, gb, &vlc[i]); | |
275 | if (ret < 0) { | |
276 | for (j = 0; j <= i; j++) | |
277 | ff_free_vlc(&vlc[j]); | |
278 | ||
279 | av_log(ctx->avctx, AV_LOG_ERROR, | |
280 | "Could not read code table %d.\n", i); | |
281 | return ret; | |
282 | } | |
283 | } | |
284 | ||
285 | /* Read in and restore every line */ | |
286 | for (i = 0; i < avctx->height; i++) { | |
287 | for (j = 0; j < 3; j++) | |
288 | read_rgb24_component_line(ctx, gb, &pred[j], &vlc[j], &dst[j]); | |
289 | ||
290 | dst += pic->linesize[0]; | |
291 | } | |
292 | ||
293 | for (i = 0; i < 3; i++) | |
294 | ff_free_vlc(&vlc[i]); | |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
299 | static int decode_yuv_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic) | |
300 | { | |
301 | AVCodecContext *avctx = ctx->avctx; | |
302 | uint8_t block; | |
303 | uint8_t *dst[3]; | |
304 | int pred[3]; | |
305 | int ret; | |
306 | int i, j; | |
307 | VLC vlc[2]; | |
308 | ||
309 | pred[0] = 0x80; | |
310 | pred[1] = 0x80; | |
311 | pred[2] = 0x80; | |
312 | ||
313 | dst[0] = pic->data[0]; | |
314 | dst[1] = pic->data[1]; | |
315 | dst[2] = pic->data[2]; | |
316 | ||
317 | skip_bits(gb, 8); | |
318 | ||
319 | block = get_bits(gb, 8); | |
320 | if (block) { | |
321 | avpriv_request_sample(ctx->avctx, "Blocked YUV"); | |
322 | return AVERROR_PATCHWELCOME; | |
323 | } | |
324 | ||
325 | /* Read in code table for luma and chroma */ | |
326 | for (i = 0; i < 2; i++) { | |
327 | ret = read_code_table(ctx, gb, &vlc[i]); | |
328 | if (ret < 0) { | |
329 | for (j = 0; j <= i; j++) | |
330 | ff_free_vlc(&vlc[j]); | |
331 | ||
332 | av_log(ctx->avctx, AV_LOG_ERROR, | |
333 | "Could not read code table %d.\n", i); | |
334 | return ret; | |
335 | } | |
336 | } | |
337 | ||
338 | /* Read in and restore every line */ | |
339 | for (i = 0; i < avctx->height; i++) { | |
340 | read_yuv_component_line(ctx, gb, &pred[0], &vlc[0], dst[0], 0); /* Y */ | |
341 | read_yuv_component_line(ctx, gb, &pred[1], &vlc[1], dst[1], 1); /* U */ | |
342 | read_yuv_component_line(ctx, gb, &pred[2], &vlc[1], dst[2], 1); /* V */ | |
343 | ||
344 | for (j = 0; j < 3; j++) | |
345 | dst[j] += pic->linesize[j]; | |
346 | } | |
347 | ||
348 | for (i = 0; i < 2; i++) | |
349 | ff_free_vlc(&vlc[i]); | |
350 | ||
351 | return 0; | |
352 | } | |
353 | ||
354 | static int cllc_decode_frame(AVCodecContext *avctx, void *data, | |
355 | int *got_picture_ptr, AVPacket *avpkt) | |
356 | { | |
357 | CLLCContext *ctx = avctx->priv_data; | |
358 | AVFrame *pic = data; | |
359 | uint8_t *src = avpkt->data; | |
360 | uint32_t info_tag, info_offset; | |
361 | int data_size; | |
362 | GetBitContext gb; | |
363 | int coding_type, ret; | |
364 | ||
365 | /* Skip the INFO header if present */ | |
366 | info_offset = 0; | |
367 | info_tag = AV_RL32(src); | |
368 | if (info_tag == MKTAG('I', 'N', 'F', 'O')) { | |
369 | info_offset = AV_RL32(src + 4); | |
370 | if (info_offset > UINT32_MAX - 8 || info_offset + 8 > avpkt->size) { | |
371 | av_log(avctx, AV_LOG_ERROR, | |
372 | "Invalid INFO header offset: 0x%08"PRIX32" is too large.\n", | |
373 | info_offset); | |
374 | return AVERROR_INVALIDDATA; | |
375 | } | |
376 | ||
377 | info_offset += 8; | |
378 | src += info_offset; | |
379 | ||
380 | av_log(avctx, AV_LOG_DEBUG, "Skipping INFO chunk.\n"); | |
381 | } | |
382 | ||
383 | data_size = (avpkt->size - info_offset) & ~1; | |
384 | ||
385 | /* Make sure our bswap16'd buffer is big enough */ | |
386 | av_fast_padded_malloc(&ctx->swapped_buf, | |
387 | &ctx->swapped_buf_size, data_size); | |
388 | if (!ctx->swapped_buf) { | |
389 | av_log(avctx, AV_LOG_ERROR, "Could not allocate swapped buffer.\n"); | |
390 | return AVERROR(ENOMEM); | |
391 | } | |
392 | ||
393 | /* bswap16 the buffer since CLLC's bitreader works in 16-bit words */ | |
394 | ctx->bdsp.bswap16_buf((uint16_t *) ctx->swapped_buf, (uint16_t *) src, | |
395 | data_size / 2); | |
396 | ||
397 | init_get_bits(&gb, ctx->swapped_buf, data_size * 8); | |
398 | ||
399 | /* | |
400 | * Read in coding type. The types are as follows: | |
401 | * | |
402 | * 0 - YUY2 | |
403 | * 1 - BGR24 (Triples) | |
404 | * 2 - BGR24 (Quads) | |
405 | * 3 - BGRA | |
406 | */ | |
407 | coding_type = (AV_RL32(src) >> 8) & 0xFF; | |
408 | av_log(avctx, AV_LOG_DEBUG, "Frame coding type: %d\n", coding_type); | |
409 | ||
410 | switch (coding_type) { | |
411 | case 0: | |
412 | avctx->pix_fmt = AV_PIX_FMT_YUV422P; | |
413 | avctx->bits_per_raw_sample = 8; | |
414 | ||
415 | if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) | |
416 | return ret; | |
417 | ||
418 | ret = decode_yuv_frame(ctx, &gb, pic); | |
419 | if (ret < 0) | |
420 | return ret; | |
421 | ||
422 | break; | |
423 | case 1: | |
424 | case 2: | |
425 | avctx->pix_fmt = AV_PIX_FMT_RGB24; | |
426 | avctx->bits_per_raw_sample = 8; | |
427 | ||
428 | if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) | |
429 | return ret; | |
430 | ||
431 | ret = decode_rgb24_frame(ctx, &gb, pic); | |
432 | if (ret < 0) | |
433 | return ret; | |
434 | ||
435 | break; | |
436 | case 3: | |
437 | avctx->pix_fmt = AV_PIX_FMT_ARGB; | |
438 | avctx->bits_per_raw_sample = 8; | |
439 | ||
440 | if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) | |
441 | return ret; | |
442 | ||
443 | ret = decode_argb_frame(ctx, &gb, pic); | |
444 | if (ret < 0) | |
445 | return ret; | |
446 | ||
447 | break; | |
448 | default: | |
449 | av_log(avctx, AV_LOG_ERROR, "Unknown coding type: %d.\n", coding_type); | |
450 | return AVERROR_INVALIDDATA; | |
451 | } | |
452 | ||
453 | pic->key_frame = 1; | |
454 | pic->pict_type = AV_PICTURE_TYPE_I; | |
455 | ||
456 | *got_picture_ptr = 1; | |
457 | ||
458 | return avpkt->size; | |
459 | } | |
460 | ||
461 | static av_cold int cllc_decode_close(AVCodecContext *avctx) | |
462 | { | |
463 | CLLCContext *ctx = avctx->priv_data; | |
464 | ||
465 | av_freep(&ctx->swapped_buf); | |
466 | ||
467 | return 0; | |
468 | } | |
469 | ||
470 | static av_cold int cllc_decode_init(AVCodecContext *avctx) | |
471 | { | |
472 | CLLCContext *ctx = avctx->priv_data; | |
473 | ||
474 | /* Initialize various context values */ | |
475 | ctx->avctx = avctx; | |
476 | ctx->swapped_buf = NULL; | |
477 | ctx->swapped_buf_size = 0; | |
478 | ||
479 | ff_bswapdsp_init(&ctx->bdsp); | |
480 | ||
481 | return 0; | |
482 | } | |
483 | ||
484 | AVCodec ff_cllc_decoder = { | |
485 | .name = "cllc", | |
486 | .long_name = NULL_IF_CONFIG_SMALL("Canopus Lossless Codec"), | |
487 | .type = AVMEDIA_TYPE_VIDEO, | |
488 | .id = AV_CODEC_ID_CLLC, | |
489 | .priv_data_size = sizeof(CLLCContext), | |
490 | .init = cllc_decode_init, | |
491 | .decode = cllc_decode_frame, | |
492 | .close = cllc_decode_close, | |
493 | .capabilities = CODEC_CAP_DR1, | |
494 | }; |