FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/cllc.c
Date: 2025-07-14 21:09:40
Exec Total Coverage
Lines: 185 223 83.0%
Functions: 10 10 100.0%
Branches: 69 96 71.9%
Line Branch Exec Source
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 "libavutil/mem.h"
27 #include "bswapdsp.h"
28 #include "canopus.h"
29 #include "get_bits.h"
30 #include "avcodec.h"
31 #include "codec_internal.h"
32 #include "thread.h"
33
34 #define VLC_BITS 7
35 #define VLC_DEPTH 2
36
37
38 typedef struct CLLCContext {
39 AVCodecContext *avctx;
40 BswapDSPContext bdsp;
41
42 uint8_t *swapped_buf;
43 int swapped_buf_size;
44 } CLLCContext;
45
46 106 static int read_code_table(CLLCContext *ctx, GetBitContext *gb, VLC *vlc)
47 {
48 uint8_t symbols[256];
49 uint8_t bits[256];
50 int num_lens, num_codes, num_codes_sum;
51 int i, j, count;
52
53 106 count = 0;
54 106 num_codes_sum = 0;
55
56 106 num_lens = get_bits(gb, 5);
57
58
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 106 if (num_lens > VLC_BITS * VLC_DEPTH) {
59 ✗ av_log(ctx->avctx, AV_LOG_ERROR, "To long VLCs %d\n", num_lens);
60 ✗ return AVERROR_INVALIDDATA;
61 }
62
63
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 1545 for (i = 0; i < num_lens; i++) {
64 1439 num_codes = get_bits(gb, 9);
65 1439 num_codes_sum += num_codes;
66
67
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 1439 if (num_codes_sum > 256) {
68 ✗ av_log(ctx->avctx, AV_LOG_ERROR,
69 "Too many VLCs (%d) to be read.\n", num_codes_sum);
70 ✗ return AVERROR_INVALIDDATA;
71 }
72
73
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 27476 for (j = 0; j < num_codes; j++) {
74 26037 symbols[count] = get_bits(gb, 8);
75 26037 bits[count] = i + 1;
76
77 26037 count++;
78 }
79 }
80
81 106 return ff_vlc_init_from_lengths(vlc, VLC_BITS, count, bits, 1,
82 106 symbols, 1, 1, 0, 0, ctx->avctx);
83 }
84
85 /*
86 * Unlike the RGB24 read/restore, which reads in a component at a time,
87 * ARGB read/restore reads in ARGB quads.
88 */
89 4320 static int read_argb_line(CLLCContext *ctx, GetBitContext *gb, int *top_left,
90 VLC *vlc, uint8_t *outbuf)
91 {
92 uint8_t *dst;
93 int pred[4];
94 int code;
95 int i;
96
97 4320 OPEN_READER(bits, gb);
98
99 4320 dst = outbuf;
100 4320 pred[0] = top_left[0];
101 4320 pred[1] = top_left[1];
102 4320 pred[2] = top_left[2];
103 4320 pred[3] = top_left[3];
104
105
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 5533920 for (i = 0; i < ctx->avctx->width; i++) {
106 /* Always get the alpha component */
107 5529600 UPDATE_CACHE(bits, gb);
108
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 5529600 GET_VLC(code, bits, gb, vlc[0].table, VLC_BITS, VLC_DEPTH);
109
110 5529600 pred[0] += code;
111 5529600 dst[0] = pred[0];
112
113 /* Skip the components if they are entirely transparent */
114
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 5529600 if (dst[0]) {
115 /* Red */
116 872412 UPDATE_CACHE(bits, gb);
117
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 872412 GET_VLC(code, bits, gb, vlc[1].table, VLC_BITS, VLC_DEPTH);
118
119 872412 pred[1] += code;
120 872412 dst[1] = pred[1];
121
122 /* Green */
123 872412 UPDATE_CACHE(bits, gb);
124
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 872412 GET_VLC(code, bits, gb, vlc[2].table, VLC_BITS, VLC_DEPTH);
125
126 872412 pred[2] += code;
127 872412 dst[2] = pred[2];
128
129 /* Blue */
130 872412 UPDATE_CACHE(bits, gb);
131
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 872412 GET_VLC(code, bits, gb, vlc[3].table, VLC_BITS, VLC_DEPTH);
132
133 872412 pred[3] += code;
134 872412 dst[3] = pred[3];
135 } else {
136 4657188 dst[1] = 0;
137 4657188 dst[2] = 0;
138 4657188 dst[3] = 0;
139 }
140
141 5529600 dst += 4;
142 }
143
144 4320 CLOSE_READER(bits, gb);
145
146 4320 top_left[0] = outbuf[0];
147
148 /* Only stash components if they are not transparent */
149
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 4320 if (top_left[0]) {
150 ✗ top_left[1] = outbuf[1];
151 ✗ top_left[2] = outbuf[2];
152 ✗ top_left[3] = outbuf[3];
153 }
154
155 4320 return 0;
156 }
157
158 23040 static int read_rgb24_component_line(CLLCContext *ctx, GetBitContext *gb,
159 int *top_left, VLC *vlc, uint8_t *outbuf)
160 {
161 uint8_t *dst;
162 int pred, code;
163 int i;
164
165 23040 OPEN_READER(bits, gb);
166
167 23040 dst = outbuf;
168 23040 pred = *top_left;
169
170 /* Simultaneously read and restore the line */
171
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 14768640 for (i = 0; i < ctx->avctx->width; i++) {
172 14745600 UPDATE_CACHE(bits, gb);
173
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 14745600 GET_VLC(code, bits, gb, vlc->table, VLC_BITS, VLC_DEPTH);
174
175 14745600 pred += code;
176 14745600 dst[0] = pred;
177 14745600 dst += 3;
178 }
179
180 23040 CLOSE_READER(bits, gb);
181
182 /* Stash the first pixel */
183 23040 *top_left = outbuf[0];
184
185 23040 return 0;
186 }
187
188 24480 static int read_yuv_component_line(CLLCContext *ctx, GetBitContext *gb,
189 int *top_left, VLC *vlc, uint8_t *outbuf,
190 int is_chroma)
191 {
192 int pred, code;
193 int i;
194
195 24480 OPEN_READER(bits, gb);
196
197 24480 pred = *top_left;
198
199 /* Simultaneously read and restore the line */
200
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 10469280 for (i = 0; i < ctx->avctx->width >> is_chroma; i++) {
201 10444800 UPDATE_CACHE(bits, gb);
202
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 10444800 GET_VLC(code, bits, gb, vlc->table, VLC_BITS, VLC_DEPTH);
203
204 10444800 pred += code;
205 10444800 outbuf[i] = pred;
206 }
207
208 24480 CLOSE_READER(bits, gb);
209
210 /* Stash the first pixel */
211 24480 *top_left = outbuf[0];
212
213 24480 return 0;
214 }
215
216 6 static int decode_argb_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic)
217 {
218 6 AVCodecContext *avctx = ctx->avctx;
219 uint8_t *dst;
220 int pred[4];
221 int ret;
222 int i, j;
223 VLC vlc[4];
224
225 6 pred[0] = 0;
226 6 pred[1] = 0x80;
227 6 pred[2] = 0x80;
228 6 pred[3] = 0x80;
229
230 6 dst = pic->data[0];
231
232 6 skip_bits(gb, 16);
233
234 /* Read in code table for each plane */
235
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 30 for (i = 0; i < 4; i++) {
236 24 ret = read_code_table(ctx, gb, &vlc[i]);
237
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 24 if (ret < 0) {
238 ✗ for (j = 0; j < i; j++)
239 ✗ ff_vlc_free(&vlc[j]);
240
241 ✗ av_log(ctx->avctx, AV_LOG_ERROR,
242 "Could not read code table %d.\n", i);
243 ✗ return ret;
244 }
245 }
246
247 /* Read in and restore every line */
248
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 4326 for (i = 0; i < avctx->height; i++) {
249 4320 read_argb_line(ctx, gb, pred, vlc, dst);
250
251 4320 dst += pic->linesize[0];
252 }
253
254
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 30 for (i = 0; i < 4; i++)
255 24 ff_vlc_free(&vlc[i]);
256
257 6 return 0;
258 }
259
260 16 static int decode_rgb24_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic)
261 {
262 16 AVCodecContext *avctx = ctx->avctx;
263 uint8_t *dst;
264 int pred[3];
265 int ret;
266 int i, j;
267 VLC vlc[3];
268
269 16 pred[0] = 0x80;
270 16 pred[1] = 0x80;
271 16 pred[2] = 0x80;
272
273 16 dst = pic->data[0];
274
275 16 skip_bits(gb, 16);
276
277 /* Read in code table for each plane */
278
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 64 for (i = 0; i < 3; i++) {
279 48 ret = read_code_table(ctx, gb, &vlc[i]);
280
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 48 if (ret < 0) {
281 ✗ for (j = 0; j < i; j++)
282 ✗ ff_vlc_free(&vlc[j]);
283
284 ✗ av_log(ctx->avctx, AV_LOG_ERROR,
285 "Could not read code table %d.\n", i);
286 ✗ return ret;
287 }
288 }
289
290 /* Read in and restore every line */
291
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 7696 for (i = 0; i < avctx->height; i++) {
292
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 30720 for (j = 0; j < 3; j++)
293 23040 read_rgb24_component_line(ctx, gb, &pred[j], &vlc[j], &dst[j]);
294
295 7680 dst += pic->linesize[0];
296 }
297
298
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 64 for (i = 0; i < 3; i++)
299 48 ff_vlc_free(&vlc[i]);
300
301 16 return 0;
302 }
303
304 17 static int decode_yuv_frame(CLLCContext *ctx, GetBitContext *gb, AVFrame *pic)
305 {
306 17 AVCodecContext *avctx = ctx->avctx;
307 uint8_t block;
308 uint8_t *dst[3];
309 int pred[3];
310 int ret;
311 int i, j;
312 VLC vlc[2];
313
314 17 pred[0] = 0x80;
315 17 pred[1] = 0x80;
316 17 pred[2] = 0x80;
317
318 17 dst[0] = pic->data[0];
319 17 dst[1] = pic->data[1];
320 17 dst[2] = pic->data[2];
321
322 17 skip_bits(gb, 8);
323
324 17 block = get_bits(gb, 8);
325
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 17 if (block) {
326 ✗ avpriv_request_sample(ctx->avctx, "Blocked YUV");
327 ✗ return AVERROR_PATCHWELCOME;
328 }
329
330 /* Read in code table for luma and chroma */
331
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 51 for (i = 0; i < 2; i++) {
332 34 ret = read_code_table(ctx, gb, &vlc[i]);
333
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 34 if (ret < 0) {
334 ✗ for (j = 0; j < i; j++)
335 ✗ ff_vlc_free(&vlc[j]);
336
337 ✗ av_log(ctx->avctx, AV_LOG_ERROR,
338 "Could not read code table %d.\n", i);
339 ✗ return ret;
340 }
341 }
342
343 /* Read in and restore every line */
344
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 8177 for (i = 0; i < avctx->height; i++) {
345 8160 read_yuv_component_line(ctx, gb, &pred[0], &vlc[0], dst[0], 0); /* Y */
346 8160 read_yuv_component_line(ctx, gb, &pred[1], &vlc[1], dst[1], 1); /* U */
347 8160 read_yuv_component_line(ctx, gb, &pred[2], &vlc[1], dst[2], 1); /* V */
348
349
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 32640 for (j = 0; j < 3; j++)
350 24480 dst[j] += pic->linesize[j];
351 }
352
353
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 51 for (i = 0; i < 2; i++)
354 34 ff_vlc_free(&vlc[i]);
355
356 17 return 0;
357 }
358
359 39 static int cllc_decode_frame(AVCodecContext *avctx, AVFrame *pic,
360 int *got_picture_ptr, AVPacket *avpkt)
361 {
362 39 CLLCContext *ctx = avctx->priv_data;
363 39 const uint8_t *src = avpkt->data;
364 uint32_t info_tag, info_offset;
365 int data_size;
366 GetBitContext gb;
367 int coding_type, ret;
368
369
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 39 if (avpkt->size < 4 + 4) {
370 ✗ av_log(avctx, AV_LOG_ERROR, "Frame is too small %d.\n", avpkt->size);
371 ✗ return AVERROR_INVALIDDATA;
372 }
373
374 39 info_offset = 0;
375 39 info_tag = AV_RL32(src);
376
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 39 if (info_tag == MKTAG('I', 'N', 'F', 'O')) {
377 39 info_offset = AV_RL32(src + 4);
378
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 39 if (info_offset > UINT32_MAX - 8 || info_offset + 8 > avpkt->size) {
379 ✗ av_log(avctx, AV_LOG_ERROR,
380 "Invalid INFO header offset: 0x%08"PRIX32" is too large.\n",
381 info_offset);
382 ✗ return AVERROR_INVALIDDATA;
383 }
384 39 ff_canopus_parse_info_tag(avctx, src + 8, info_offset);
385
386 39 info_offset += 8;
387 39 src += info_offset;
388 }
389
390 39 data_size = (avpkt->size - info_offset) & ~1;
391
392 /* Make sure our bswap16'd buffer is big enough */
393 39 av_fast_padded_malloc(&ctx->swapped_buf,
394 39 &ctx->swapped_buf_size, data_size);
395
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 39 if (!ctx->swapped_buf) {
396 ✗ av_log(avctx, AV_LOG_ERROR, "Could not allocate swapped buffer.\n");
397 ✗ return AVERROR(ENOMEM);
398 }
399
400 /* bswap16 the buffer since CLLC's bitreader works in 16-bit words */
401 39 ctx->bdsp.bswap16_buf((uint16_t *) ctx->swapped_buf, (uint16_t *) src,
402 data_size / 2);
403
404
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 39 if ((ret = init_get_bits8(&gb, ctx->swapped_buf, data_size)) < 0)
405 ✗ return ret;
406
407 /*
408 * Read in coding type. The types are as follows:
409 *
410 * 0 - YUY2
411 * 1 - BGR24 (Triples)
412 * 2 - BGR24 (Quads)
413 * 3 - BGRA
414 */
415 39 coding_type = (AV_RL32(src) >> 8) & 0xFF;
416 39 av_log(avctx, AV_LOG_DEBUG, "Frame coding type: %d\n", coding_type);
417
418
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 39 if(get_bits_left(&gb) < avctx->height * avctx->width)
419 ✗ return AVERROR_INVALIDDATA;
420
421
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 39 switch (coding_type) {
422 17 case 0:
423 17 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
424 17 avctx->bits_per_raw_sample = 8;
425
426
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 17 if ((ret = ff_thread_get_buffer(avctx, pic, 0)) < 0)
427 ✗ return ret;
428
429 17 ret = decode_yuv_frame(ctx, &gb, pic);
430
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 17 if (ret < 0)
431 ✗ return ret;
432
433 17 break;
434 16 case 1:
435 case 2:
436 16 avctx->pix_fmt = AV_PIX_FMT_RGB24;
437 16 avctx->bits_per_raw_sample = 8;
438
439
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 16 if ((ret = ff_thread_get_buffer(avctx, pic, 0)) < 0)
440 ✗ return ret;
441
442 16 ret = decode_rgb24_frame(ctx, &gb, pic);
443
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 16 if (ret < 0)
444 ✗ return ret;
445
446 16 break;
447 6 case 3:
448 6 avctx->pix_fmt = AV_PIX_FMT_ARGB;
449 6 avctx->bits_per_raw_sample = 8;
450
451
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 6 if ((ret = ff_thread_get_buffer(avctx, pic, 0)) < 0)
452 ✗ return ret;
453
454 6 ret = decode_argb_frame(ctx, &gb, pic);
455
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 6 if (ret < 0)
456 ✗ return ret;
457
458 6 break;
459 ✗ default:
460 ✗ av_log(avctx, AV_LOG_ERROR, "Unknown coding type: %d.\n", coding_type);
461 ✗ return AVERROR_INVALIDDATA;
462 }
463
464 39 *got_picture_ptr = 1;
465
466 39 return avpkt->size;
467 }
468
469 6 static av_cold int cllc_decode_close(AVCodecContext *avctx)
470 {
471 6 CLLCContext *ctx = avctx->priv_data;
472
473 6 av_freep(&ctx->swapped_buf);
474
475 6 return 0;
476 }
477
478 6 static av_cold int cllc_decode_init(AVCodecContext *avctx)
479 {
480 6 CLLCContext *ctx = avctx->priv_data;
481
482 /* Initialize various context values */
483 6 ctx->avctx = avctx;
484 6 ctx->swapped_buf = NULL;
485 6 ctx->swapped_buf_size = 0;
486
487 6 ff_bswapdsp_init(&ctx->bdsp);
488
489 6 return 0;
490 }
491
492 const FFCodec ff_cllc_decoder = {
493 .p.name = "cllc",
494 CODEC_LONG_NAME("Canopus Lossless Codec"),
495 .p.type = AVMEDIA_TYPE_VIDEO,
496 .p.id = AV_CODEC_ID_CLLC,
497 .priv_data_size = sizeof(CLLCContext),
498 .init = cllc_decode_init,
499 FF_CODEC_DECODE_CB(cllc_decode_frame),
500 .close = cllc_decode_close,
501 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
502 };
503