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 "canopus.h"
28 #include "get_bits.h"
29 #include "avcodec.h"
30 #include "codec_internal.h"
31 #include "thread.h"
32
33 #define VLC_BITS 7
34 #define VLC_DEPTH 2
35
36
37 typedef struct CLLCContext {
38 AVCodecContext *avctx;
39 BswapDSPContext bdsp;
40
41 uint8_t *swapped_buf;
42 int swapped_buf_size;
43 } CLLCContext;
44
read_code_table(CLLCContext * ctx,GetBitContext * gb,VLC * vlc)45 static int read_code_table(CLLCContext *ctx, GetBitContext *gb, VLC *vlc)
46 {
47 uint8_t symbols[256];
48 uint8_t bits[256];
49 int num_lens, num_codes, num_codes_sum;
50 int i, j, count;
51
52 count = 0;
53 num_codes_sum = 0;
54
55 num_lens = get_bits(gb, 5);
56
57 if (num_lens > VLC_BITS * VLC_DEPTH) {
58 av_log(ctx->avctx, AV_LOG_ERROR, "To long VLCs %d\n", num_lens);
59 return AVERROR_INVALIDDATA;
60 }
61
62 for (i = 0; i < num_lens; i++) {
63 num_codes = get_bits(gb, 9);
64 num_codes_sum += num_codes;
65
66 if (num_codes_sum > 256) {
67 av_log(ctx->avctx, AV_LOG_ERROR,
68 "Too many VLCs (%d) to be read.\n", num_codes_sum);
69 return AVERROR_INVALIDDATA;
70 }
71
72 for (j = 0; j < num_codes; j++) {
73 symbols[count] = get_bits(gb, 8);
74 bits[count] = i + 1;
75
76 count++;
77 }
78 }
79
80 return ff_init_vlc_from_lengths(vlc, VLC_BITS, count, bits, 1,
81 symbols, 1, 1, 0, 0, ctx->avctx);
82 }
83
84 /*
85 * Unlike the RGB24 read/restore, which reads in a component at a time,
86 * ARGB read/restore reads in ARGB quads.
87 */
read_argb_line(CLLCContext * ctx,GetBitContext * gb,int * top_left,VLC * vlc,uint8_t * outbuf)88 static int read_argb_line(CLLCContext *ctx, GetBitContext *gb, int *top_left,
89 VLC *vlc, uint8_t *outbuf)
90 {
91 uint8_t *dst;
92 int pred[4];
93 int code;
94 int i;
95
96 OPEN_READER(bits, gb);
97
98 dst = outbuf;
99 pred[0] = top_left[0];
100 pred[1] = top_left[1];
101 pred[2] = top_left[2];
102 pred[3] = top_left[3];
103
104 for (i = 0; i < ctx->avctx->width; i++) {
105 /* Always get the alpha component */
106 UPDATE_CACHE(bits, gb);
107 GET_VLC(code, bits, gb, vlc[0].table, VLC_BITS, VLC_DEPTH);
108
109 pred[0] += code;
110 dst[0] = pred[0];
111
112 /* Skip the components if they are entirely transparent */
113 if (dst[0]) {
114 /* Red */
115 UPDATE_CACHE(bits, gb);
116 GET_VLC(code, bits, gb, vlc[1].table, VLC_BITS, VLC_DEPTH);
117
118 pred[1] += code;
119 dst[1] = pred[1];
120
121 /* Green */
122 UPDATE_CACHE(bits, gb);
123 GET_VLC(code, bits, gb, vlc[2].table, VLC_BITS, VLC_DEPTH);
124
125 pred[2] += code;
126 dst[2] = pred[2];
127
128 /* Blue */
129 UPDATE_CACHE(bits, gb);
130 GET_VLC(code, bits, gb, vlc[3].table, VLC_BITS, VLC_DEPTH);
131
132 pred[3] += code;
133 dst[3] = pred[3];
134 } else {
135 dst[1] = 0;
136 dst[2] = 0;
137 dst[3] = 0;
138 }
139
140 dst += 4;
141 }
142
143 CLOSE_READER(bits, gb);
144
145 top_left[0] = outbuf[0];
146
147 /* Only stash components if they are not transparent */
148 if (top_left[0]) {
149 top_left[1] = outbuf[1];
150 top_left[2] = outbuf[2];
151 top_left[3] = outbuf[3];
152 }
153
154 return 0;
155 }
156
read_rgb24_component_line(CLLCContext * ctx,GetBitContext * gb,int * top_left,VLC * vlc,uint8_t * outbuf)157 static int read_rgb24_component_line(CLLCContext *ctx, GetBitContext *gb,
158 int *top_left, VLC *vlc, uint8_t *outbuf)
159 {
160 uint8_t *dst;
161 int pred, code;
162 int i;
163
164 OPEN_READER(bits, gb);
165
166 dst = outbuf;
167 pred = *top_left;
168
169 /* Simultaneously read and restore the line */
170 for (i = 0; i < ctx->avctx->width; i++) {
171 UPDATE_CACHE(bits, gb);
172 GET_VLC(code, bits, gb, vlc->table, VLC_BITS, VLC_DEPTH);
173
174 pred += code;
175 dst[0] = pred;
176 dst += 3;
177 }
178
179 CLOSE_READER(bits, gb);
180
181 /* Stash the first pixel */
182 *top_left = outbuf[0];
183
184 return 0;
185 }
186
read_yuv_component_line(CLLCContext * ctx,GetBitContext * gb,int * top_left,VLC * vlc,uint8_t * outbuf,int is_chroma)187 static int read_yuv_component_line(CLLCContext *ctx, GetBitContext *gb,
188 int *top_left, VLC *vlc, uint8_t *outbuf,
189 int is_chroma)
190 {
191 int pred, code;
192 int i;
193
194 OPEN_READER(bits, gb);
195
196 pred = *top_left;
197
198 /* Simultaneously read and restore the line */
199 for (i = 0; i < ctx->avctx->width >> is_chroma; i++) {
200 UPDATE_CACHE(bits, gb);
201 GET_VLC(code, bits, gb, vlc->table, VLC_BITS, VLC_DEPTH);
202
203 pred += code;
204 outbuf[i] = pred;
205 }
206
207 CLOSE_READER(bits, gb);
208
209 /* Stash the first pixel */
210 *top_left = outbuf[0];
211
212 return 0;
213 }
214
decode_argb_frame(CLLCContext * ctx,GetBitContext * gb,AVFrame * pic)215 static int decode_argb_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic)
216 {
217 AVCodecContext *avctx = ctx->avctx;
218 uint8_t *dst;
219 int pred[4];
220 int ret;
221 int i, j;
222 VLC vlc[4];
223
224 pred[0] = 0;
225 pred[1] = 0x80;
226 pred[2] = 0x80;
227 pred[3] = 0x80;
228
229 dst = pic->data[0];
230
231 skip_bits(gb, 16);
232
233 /* Read in code table for each plane */
234 for (i = 0; i < 4; i++) {
235 ret = read_code_table(ctx, gb, &vlc[i]);
236 if (ret < 0) {
237 for (j = 0; j < i; j++)
238 ff_free_vlc(&vlc[j]);
239
240 av_log(ctx->avctx, AV_LOG_ERROR,
241 "Could not read code table %d.\n", i);
242 return ret;
243 }
244 }
245
246 /* Read in and restore every line */
247 for (i = 0; i < avctx->height; i++) {
248 read_argb_line(ctx, gb, pred, vlc, dst);
249
250 dst += pic->linesize[0];
251 }
252
253 for (i = 0; i < 4; i++)
254 ff_free_vlc(&vlc[i]);
255
256 return 0;
257 }
258
decode_rgb24_frame(CLLCContext * ctx,GetBitContext * gb,AVFrame * pic)259 static int decode_rgb24_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic)
260 {
261 AVCodecContext *avctx = ctx->avctx;
262 uint8_t *dst;
263 int pred[3];
264 int ret;
265 int i, j;
266 VLC vlc[3];
267
268 pred[0] = 0x80;
269 pred[1] = 0x80;
270 pred[2] = 0x80;
271
272 dst = pic->data[0];
273
274 skip_bits(gb, 16);
275
276 /* Read in code table for each plane */
277 for (i = 0; i < 3; i++) {
278 ret = read_code_table(ctx, gb, &vlc[i]);
279 if (ret < 0) {
280 for (j = 0; j < i; j++)
281 ff_free_vlc(&vlc[j]);
282
283 av_log(ctx->avctx, AV_LOG_ERROR,
284 "Could not read code table %d.\n", i);
285 return ret;
286 }
287 }
288
289 /* Read in and restore every line */
290 for (i = 0; i < avctx->height; i++) {
291 for (j = 0; j < 3; j++)
292 read_rgb24_component_line(ctx, gb, &pred[j], &vlc[j], &dst[j]);
293
294 dst += pic->linesize[0];
295 }
296
297 for (i = 0; i < 3; i++)
298 ff_free_vlc(&vlc[i]);
299
300 return 0;
301 }
302
decode_yuv_frame(CLLCContext * ctx,GetBitContext * gb,AVFrame * pic)303 static int decode_yuv_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic)
304 {
305 AVCodecContext *avctx = ctx->avctx;
306 uint8_t block;
307 uint8_t *dst[3];
308 int pred[3];
309 int ret;
310 int i, j;
311 VLC vlc[2];
312
313 pred[0] = 0x80;
314 pred[1] = 0x80;
315 pred[2] = 0x80;
316
317 dst[0] = pic->data[0];
318 dst[1] = pic->data[1];
319 dst[2] = pic->data[2];
320
321 skip_bits(gb, 8);
322
323 block = get_bits(gb, 8);
324 if (block) {
325 avpriv_request_sample(ctx->avctx, "Blocked YUV");
326 return AVERROR_PATCHWELCOME;
327 }
328
329 /* Read in code table for luma and chroma */
330 for (i = 0; i < 2; i++) {
331 ret = read_code_table(ctx, gb, &vlc[i]);
332 if (ret < 0) {
333 for (j = 0; j < i; j++)
334 ff_free_vlc(&vlc[j]);
335
336 av_log(ctx->avctx, AV_LOG_ERROR,
337 "Could not read code table %d.\n", i);
338 return ret;
339 }
340 }
341
342 /* Read in and restore every line */
343 for (i = 0; i < avctx->height; i++) {
344 read_yuv_component_line(ctx, gb, &pred[0], &vlc[0], dst[0], 0); /* Y */
345 read_yuv_component_line(ctx, gb, &pred[1], &vlc[1], dst[1], 1); /* U */
346 read_yuv_component_line(ctx, gb, &pred[2], &vlc[1], dst[2], 1); /* V */
347
348 for (j = 0; j < 3; j++)
349 dst[j] += pic->linesize[j];
350 }
351
352 for (i = 0; i < 2; i++)
353 ff_free_vlc(&vlc[i]);
354
355 return 0;
356 }
357
cllc_decode_frame(AVCodecContext * avctx,AVFrame * pic,int * got_picture_ptr,AVPacket * avpkt)358 static int cllc_decode_frame(AVCodecContext *avctx, AVFrame *pic,
359 int *got_picture_ptr, AVPacket *avpkt)
360 {
361 CLLCContext *ctx = avctx->priv_data;
362 const uint8_t *src = avpkt->data;
363 uint32_t info_tag, info_offset;
364 int data_size;
365 GetBitContext gb;
366 int coding_type, ret;
367
368 if (avpkt->size < 4 + 4) {
369 av_log(avctx, AV_LOG_ERROR, "Frame is too small %d.\n", avpkt->size);
370 return AVERROR_INVALIDDATA;
371 }
372
373 info_offset = 0;
374 info_tag = AV_RL32(src);
375 if (info_tag == MKTAG('I', 'N', 'F', 'O')) {
376 info_offset = AV_RL32(src + 4);
377 if (info_offset > UINT32_MAX - 8 || info_offset + 8 > avpkt->size) {
378 av_log(avctx, AV_LOG_ERROR,
379 "Invalid INFO header offset: 0x%08"PRIX32" is too large.\n",
380 info_offset);
381 return AVERROR_INVALIDDATA;
382 }
383 ff_canopus_parse_info_tag(avctx, src + 8, info_offset);
384
385 info_offset += 8;
386 src += info_offset;
387 }
388
389 data_size = (avpkt->size - info_offset) & ~1;
390
391 /* Make sure our bswap16'd buffer is big enough */
392 av_fast_padded_malloc(&ctx->swapped_buf,
393 &ctx->swapped_buf_size, data_size);
394 if (!ctx->swapped_buf) {
395 av_log(avctx, AV_LOG_ERROR, "Could not allocate swapped buffer.\n");
396 return AVERROR(ENOMEM);
397 }
398
399 /* bswap16 the buffer since CLLC's bitreader works in 16-bit words */
400 ctx->bdsp.bswap16_buf((uint16_t *) ctx->swapped_buf, (uint16_t *) src,
401 data_size / 2);
402
403 if ((ret = init_get_bits8(&gb, ctx->swapped_buf, data_size)) < 0)
404 return ret;
405
406 /*
407 * Read in coding type. The types are as follows:
408 *
409 * 0 - YUY2
410 * 1 - BGR24 (Triples)
411 * 2 - BGR24 (Quads)
412 * 3 - BGRA
413 */
414 coding_type = (AV_RL32(src) >> 8) & 0xFF;
415 av_log(avctx, AV_LOG_DEBUG, "Frame coding type: %d\n", coding_type);
416
417 if(get_bits_left(&gb) < avctx->height * avctx->width)
418 return AVERROR_INVALIDDATA;
419
420 switch (coding_type) {
421 case 0:
422 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
423 avctx->bits_per_raw_sample = 8;
424
425 if ((ret = ff_thread_get_buffer(avctx, pic, 0)) < 0)
426 return ret;
427
428 ret = decode_yuv_frame(ctx, &gb, pic);
429 if (ret < 0)
430 return ret;
431
432 break;
433 case 1:
434 case 2:
435 avctx->pix_fmt = AV_PIX_FMT_RGB24;
436 avctx->bits_per_raw_sample = 8;
437
438 if ((ret = ff_thread_get_buffer(avctx, pic, 0)) < 0)
439 return ret;
440
441 ret = decode_rgb24_frame(ctx, &gb, pic);
442 if (ret < 0)
443 return ret;
444
445 break;
446 case 3:
447 avctx->pix_fmt = AV_PIX_FMT_ARGB;
448 avctx->bits_per_raw_sample = 8;
449
450 if ((ret = ff_thread_get_buffer(avctx, pic, 0)) < 0)
451 return ret;
452
453 ret = decode_argb_frame(ctx, &gb, pic);
454 if (ret < 0)
455 return ret;
456
457 break;
458 default:
459 av_log(avctx, AV_LOG_ERROR, "Unknown coding type: %d.\n", coding_type);
460 return AVERROR_INVALIDDATA;
461 }
462
463 pic->key_frame = 1;
464 pic->pict_type = AV_PICTURE_TYPE_I;
465
466 *got_picture_ptr = 1;
467
468 return avpkt->size;
469 }
470
cllc_decode_close(AVCodecContext * avctx)471 static av_cold int cllc_decode_close(AVCodecContext *avctx)
472 {
473 CLLCContext *ctx = avctx->priv_data;
474
475 av_freep(&ctx->swapped_buf);
476
477 return 0;
478 }
479
cllc_decode_init(AVCodecContext * avctx)480 static av_cold int cllc_decode_init(AVCodecContext *avctx)
481 {
482 CLLCContext *ctx = avctx->priv_data;
483
484 /* Initialize various context values */
485 ctx->avctx = avctx;
486 ctx->swapped_buf = NULL;
487 ctx->swapped_buf_size = 0;
488
489 ff_bswapdsp_init(&ctx->bdsp);
490
491 return 0;
492 }
493
494 const FFCodec ff_cllc_decoder = {
495 .p.name = "cllc",
496 .p.long_name = NULL_IF_CONFIG_SMALL("Canopus Lossless Codec"),
497 .p.type = AVMEDIA_TYPE_VIDEO,
498 .p.id = AV_CODEC_ID_CLLC,
499 .priv_data_size = sizeof(CLLCContext),
500 .init = cllc_decode_init,
501 FF_CODEC_DECODE_CB(cllc_decode_frame),
502 .close = cllc_decode_close,
503 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
504 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
505 };
506