FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/lcldec.c
Date: 2022-07-05 19:52:29
Exec Total Coverage
Lines: 143 401 35.7%
Branches: 67 192 34.9%

Line Branch Exec Source
1 /*
2 * LCL (LossLess Codec Library) Codec
3 * Copyright (c) 2002-2004 Roberto Togni
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 /**
23 * @file
24 * LCL (LossLess Codec Library) Video Codec
25 * Decoder for MSZH and ZLIB codecs
26 * Experimental encoder for ZLIB RGB24
27 *
28 * Fourcc: MSZH, ZLIB
29 *
30 * Original Win32 dll:
31 * Ver2.23 By Kenji Oshima 2000.09.20
32 * avimszh.dll, avizlib.dll
33 *
34 * A description of the decoding algorithm can be found here:
35 * http://www.pcisys.net/~melanson/codecs
36 *
37 * Supports: BGR24 (RGB 24bpp)
38 */
39
40 #include "config_components.h"
41
42 #include <stdio.h>
43 #include <stdlib.h>
44
45 #include "libavutil/mem.h"
46 #include "libavutil/pixdesc.h"
47 #include "avcodec.h"
48 #include "bytestream.h"
49 #include "codec_internal.h"
50 #include "lcl.h"
51 #include "thread.h"
52
53 #if CONFIG_ZLIB_DECODER
54 #include "zlib_wrapper.h"
55 #include <zlib.h>
56 #endif
57
58 typedef struct LclDecContext {
59 // Image type
60 int imgtype;
61 // Compression type
62 int compression;
63 // Flags
64 int flags;
65 // Decompressed data size
66 unsigned int decomp_size;
67 // Decompression buffer
68 unsigned char* decomp_buf;
69 #if CONFIG_ZLIB_DECODER
70 FFZStream zstream;
71 #endif
72 } LclDecContext;
73
74
75 /**
76 * @param srcptr compressed source buffer, must be padded with at least 5 extra bytes
77 * @param destptr must be padded sufficiently for av_memcpy_backptr
78 */
79 1 static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
80 {
81 1 unsigned char *destptr_bak = destptr;
82 1 unsigned char *destptr_end = destptr + destsize;
83 1 const unsigned char *srcptr_end = srcptr + srclen;
84 1 unsigned mask = *srcptr++;
85 1 unsigned maskbit = 0x80;
86
87
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30273 while (srcptr < srcptr_end && destptr < destptr_end) {
88
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30272 if (!(mask & maskbit)) {
89 19751 memcpy(destptr, srcptr, 4);
90 19751 destptr += 4;
91 19751 srcptr += 4;
92 } else {
93 10521 unsigned ofs = bytestream_get_le16(&srcptr);
94 10521 unsigned cnt = (ofs >> 11) + 1;
95 10521 ofs &= 0x7ff;
96 10521 ofs = FFMIN(ofs, destptr - destptr_bak);
97 10521 cnt *= 4;
98 10521 cnt = FFMIN(cnt, destptr_end - destptr);
99
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10521 if (ofs) {
100 10521 av_memcpy_backptr(destptr, ofs, cnt);
101 } else {
102 // Not known what the correct behaviour is, but
103 // this at least avoids uninitialized data.
104 memset(destptr, 0, cnt);
105 }
106 10521 destptr += cnt;
107 }
108 30272 maskbit >>= 1;
109
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30272 if (!maskbit) {
110 3784 mask = *srcptr++;
111
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6496 while (!mask) {
112
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2713 if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;
113 2712 memcpy(destptr, srcptr, 32);
114 2712 destptr += 32;
115 2712 srcptr += 32;
116 2712 mask = *srcptr++;
117 }
118 3784 maskbit = 0x80;
119 }
120 }
121
122 1 return destptr - destptr_bak;
123 }
124
125
126 #if CONFIG_ZLIB_DECODER
127 /**
128 * @brief decompress a zlib-compressed data block into decomp_buf
129 * @param src compressed input buffer
130 * @param src_len data length in input buffer
131 * @param offset offset in decomp_buf
132 * @param expected expected decompressed length
133 */
134 201 static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
135 {
136 201 LclDecContext *c = avctx->priv_data;
137 201 z_stream *const zstream = &c->zstream.zstream;
138 201 int zret = inflateReset(zstream);
139
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201 if (zret != Z_OK) {
140 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
141 return AVERROR_UNKNOWN;
142 }
143 201 zstream->next_in = src;
144 201 zstream->avail_in = src_len;
145 201 zstream->next_out = c->decomp_buf + offset;
146 201 zstream->avail_out = c->decomp_size - offset;
147 201 zret = inflate(zstream, Z_FINISH);
148
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201 if (zret != Z_OK && zret != Z_STREAM_END) {
149 av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
150 return AVERROR_UNKNOWN;
151 }
152
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201 if (expected != (unsigned int)zstream->total_out) {
153 av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
154 expected, zstream->total_out);
155 return AVERROR_UNKNOWN;
156 }
157 201 return zstream->total_out;
158 }
159 #endif
160
161
162 202 static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
163 int *got_frame, AVPacket *avpkt)
164 {
165 202 const uint8_t *buf = avpkt->data;
166 202 int buf_size = avpkt->size;
167 202 LclDecContext * const c = avctx->priv_data;
168 unsigned int pixel_ptr;
169 int row, col;
170 202 unsigned char *encoded = avpkt->data, *outptr;
171 uint8_t *y_out, *u_out, *v_out;
172 202 unsigned int width = avctx->width; // Real image width
173 202 unsigned int height = avctx->height; // Real image height
174 unsigned int mszh_dlen;
175 unsigned char yq, y1q, uq, vq;
176 int uqvq, ret;
177 unsigned int mthread_inlen, mthread_outlen;
178 202 unsigned int len = buf_size;
179 int linesize, offset;
180
181
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202 if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)
182 return ret;
183
184 202 outptr = frame->data[0]; // Output image pointer
185
186 /* Decompress frame */
187
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202 switch (avctx->codec_id) {
188 1 case AV_CODEC_ID_MSZH:
189
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1 switch (c->compression) {
190 1 case COMP_MSZH:
191
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1 if (c->imgtype == IMGTYPE_RGB24 && len == FFALIGN(width * 3, 4) * height ||
192
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1 c->imgtype == IMGTYPE_YUV111 && len == width * height * 3) {
193 ;
194
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1 } else if (c->flags & FLAG_MULTITHREAD) {
195 mthread_inlen = AV_RL32(buf);
196 if (len < 8 || len - 8 < mthread_inlen) {
197 av_log(avctx, AV_LOG_ERROR, "len %d is too small\n", len);
198 return AVERROR_INVALIDDATA;
199 }
200 mthread_outlen = AV_RL32(buf + 4);
201 mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
202 mszh_dlen = mszh_decomp(buf + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
203 if (mthread_outlen != mszh_dlen) {
204 av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
205 mthread_outlen, mszh_dlen);
206 return AVERROR_INVALIDDATA;
207 }
208 mszh_dlen = mszh_decomp(buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
209 c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
210 if (mthread_outlen != mszh_dlen) {
211 av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
212 mthread_outlen, mszh_dlen);
213 return AVERROR_INVALIDDATA;
214 }
215 encoded = c->decomp_buf;
216 len = c->decomp_size;
217 } else {
218 1 mszh_dlen = mszh_decomp(buf, len, c->decomp_buf, c->decomp_size);
219
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1 if (c->decomp_size != mszh_dlen) {
220 av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
221 c->decomp_size, mszh_dlen);
222 return AVERROR_INVALIDDATA;
223 }
224 1 encoded = c->decomp_buf;
225 1 len = mszh_dlen;
226 }
227 1 break;
228 case COMP_MSZH_NOCOMP: {
229 int bppx2;
230 switch (c->imgtype) {
231 case IMGTYPE_YUV111:
232 case IMGTYPE_RGB24:
233 bppx2 = 6;
234 break;
235 case IMGTYPE_YUV422:
236 case IMGTYPE_YUV211:
237 bppx2 = 4;
238 break;
239 case IMGTYPE_YUV411:
240 case IMGTYPE_YUV420:
241 bppx2 = 3;
242 break;
243 default:
244 bppx2 = 0; // will error out below
245 break;
246 }
247 if (len < ((width * height * bppx2) >> 1))
248 return AVERROR_INVALIDDATA;
249 break;
250 }
251 default:
252 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
253 return AVERROR_INVALIDDATA;
254 }
255 1 break;
256 #if CONFIG_ZLIB_DECODER
257 201 case AV_CODEC_ID_ZLIB:
258 /* Using the original dll with normal compression (-1) and RGB format
259 * gives a file with ZLIB fourcc, but frame is really uncompressed.
260 * To be sure that's true check also frame size */
261
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201 if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
262
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200 len == width * height * 3) {
263 if (c->flags & FLAG_PNGFILTER) {
264 memcpy(c->decomp_buf, buf, len);
265 encoded = c->decomp_buf;
266 } else {
267 break;
268 }
269
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201 } else if (c->flags & FLAG_MULTITHREAD) {
270 mthread_inlen = AV_RL32(buf);
271 mthread_inlen = FFMIN(mthread_inlen, len - 8);
272 mthread_outlen = AV_RL32(buf + 4);
273 mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
274 ret = zlib_decomp(avctx, buf + 8, mthread_inlen, 0, mthread_outlen);
275 if (ret < 0) return ret;
276 ret = zlib_decomp(avctx, buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
277 mthread_outlen, mthread_outlen);
278 if (ret < 0) return ret;
279 } else {
280 201 int ret = zlib_decomp(avctx, buf, len, 0, c->decomp_size);
281
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201 if (ret < 0) return ret;
282 }
283 201 encoded = c->decomp_buf;
284 201 len = c->decomp_size;
285 201 break;
286 #endif
287 default:
288 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
289 return AVERROR_INVALIDDATA;
290 }
291
292
293 /* Apply PNG filter */
294
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202 if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {
295 switch (c->imgtype) {
296 case IMGTYPE_YUV111:
297 case IMGTYPE_RGB24:
298 for (row = 0; row < height; row++) {
299 pixel_ptr = row * width * 3;
300 yq = encoded[pixel_ptr++];
301 uqvq = AV_RL16(encoded+pixel_ptr);
302 pixel_ptr += 2;
303 for (col = 1; col < width; col++) {
304 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
305 uqvq -= AV_RL16(encoded+pixel_ptr+1);
306 AV_WL16(encoded+pixel_ptr+1, uqvq);
307 pixel_ptr += 3;
308 }
309 }
310 break;
311 case IMGTYPE_YUV422:
312 for (row = 0; row < height; row++) {
313 pixel_ptr = row * width * 2;
314 yq = uq = vq =0;
315 for (col = 0; col < width/4; col++) {
316 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
317 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
318 encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
319 encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
320 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
321 encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
322 encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
323 encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
324 pixel_ptr += 8;
325 }
326 }
327 break;
328 case IMGTYPE_YUV411:
329 for (row = 0; row < height; row++) {
330 pixel_ptr = row * width / 2 * 3;
331 yq = uq = vq =0;
332 for (col = 0; col < width/4; col++) {
333 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
334 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
335 encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
336 encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
337 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
338 encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
339 pixel_ptr += 6;
340 }
341 }
342 break;
343 case IMGTYPE_YUV211:
344 for (row = 0; row < height; row++) {
345 pixel_ptr = row * width * 2;
346 yq = uq = vq =0;
347 for (col = 0; col < width/2; col++) {
348 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
349 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
350 encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
351 encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
352 pixel_ptr += 4;
353 }
354 }
355 break;
356 case IMGTYPE_YUV420:
357 for (row = 0; row < height/2; row++) {
358 pixel_ptr = row * width * 3;
359 yq = y1q = uq = vq =0;
360 for (col = 0; col < width/2; col++) {
361 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
362 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
363 encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
364 encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
365 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
366 encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
367 pixel_ptr += 6;
368 }
369 }
370 break;
371 default:
372 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
373 return AVERROR_INVALIDDATA;
374 }
375 }
376
377 /* Convert colorspace */
378 202 y_out = frame->data[0] + (height - 1) * frame->linesize[0];
379 202 offset = (height - 1) * frame->linesize[1];
380
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202 u_out = FF_PTR_ADD(frame->data[1], offset);
381 202 offset = (height - 1) * frame->linesize[2];
382
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202 v_out = FF_PTR_ADD(frame->data[2], offset);
383
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202 switch (c->imgtype) {
384 case IMGTYPE_YUV111:
385 for (row = 0; row < height; row++) {
386 for (col = 0; col < width; col++) {
387 y_out[col] = *encoded++;
388 u_out[col] = *encoded++ + 128;
389 v_out[col] = *encoded++ + 128;
390 }
391 y_out -= frame->linesize[0];
392 u_out -= frame->linesize[1];
393 v_out -= frame->linesize[2];
394 }
395 break;
396 case IMGTYPE_YUV422:
397 for (row = 0; row < height; row++) {
398 for (col = 0; col < width - 3; col += 4) {
399 memcpy(y_out + col, encoded, 4);
400 encoded += 4;
401 u_out[ col >> 1 ] = *encoded++ + 128;
402 u_out[(col >> 1) + 1] = *encoded++ + 128;
403 v_out[ col >> 1 ] = *encoded++ + 128;
404 v_out[(col >> 1) + 1] = *encoded++ + 128;
405 }
406 y_out -= frame->linesize[0];
407 u_out -= frame->linesize[1];
408 v_out -= frame->linesize[2];
409 }
410 break;
411 202 case IMGTYPE_RGB24:
412
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202 linesize = len < FFALIGN(3 * width, 4) * height ? 3 * width : FFALIGN(3 * width, 4);
413
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45582 for (row = height - 1; row >= 0; row--) {
414 45380 pixel_ptr = row * frame->linesize[0];
415 45380 memcpy(outptr + pixel_ptr, encoded, 3 * width);
416 45380 encoded += linesize;
417 }
418 202 break;
419 case IMGTYPE_YUV411:
420 for (row = 0; row < height; row++) {
421 for (col = 0; col < width - 3; col += 4) {
422 memcpy(y_out + col, encoded, 4);
423 encoded += 4;
424 u_out[col >> 2] = *encoded++ + 128;
425 v_out[col >> 2] = *encoded++ + 128;
426 }
427 y_out -= frame->linesize[0];
428 u_out -= frame->linesize[1];
429 v_out -= frame->linesize[2];
430 }
431 break;
432 case IMGTYPE_YUV211:
433 for (row = 0; row < height; row++) {
434 for (col = 0; col < width - 1; col += 2) {
435 memcpy(y_out + col, encoded, 2);
436 encoded += 2;
437 u_out[col >> 1] = *encoded++ + 128;
438 v_out[col >> 1] = *encoded++ + 128;
439 }
440 y_out -= frame->linesize[0];
441 u_out -= frame->linesize[1];
442 v_out -= frame->linesize[2];
443 }
444 break;
445 case IMGTYPE_YUV420:
446 u_out = frame->data[1] + ((height >> 1) - 1) * frame->linesize[1];
447 v_out = frame->data[2] + ((height >> 1) - 1) * frame->linesize[2];
448 for (row = 0; row < height - 1; row += 2) {
449 for (col = 0; col < width - 1; col += 2) {
450 memcpy(y_out + col, encoded, 2);
451 encoded += 2;
452 memcpy(y_out + col - frame->linesize[0], encoded, 2);
453 encoded += 2;
454 u_out[col >> 1] = *encoded++ + 128;
455 v_out[col >> 1] = *encoded++ + 128;
456 }
457 y_out -= frame->linesize[0] << 1;
458 u_out -= frame->linesize[1];
459 v_out -= frame->linesize[2];
460 }
461 break;
462 default:
463 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
464 return AVERROR_INVALIDDATA;
465 }
466
467 202 frame->key_frame = 1;
468 202 frame->pict_type = AV_PICTURE_TYPE_I;
469
470 202 *got_frame = 1;
471
472 /* always report that the buffer was completely consumed */
473 202 return buf_size;
474 }
475
476 12 static av_cold int decode_init(AVCodecContext *avctx)
477 {
478 12 LclDecContext * const c = avctx->priv_data;
479 12 unsigned int basesize = avctx->width * avctx->height;
480 12 unsigned int max_basesize = FFALIGN(avctx->width, 4) *
481 12 FFALIGN(avctx->height, 4);
482 unsigned int max_decomp_size;
483 int subsample_h, subsample_v;
484
485
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12 if (avctx->extradata_size < 8) {
486 av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
487 return AVERROR_INVALIDDATA;
488 }
489
490 /* Check codec type */
491
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12 if ((avctx->codec_id == AV_CODEC_ID_MSZH && avctx->extradata[7] != CODEC_MSZH) ||
492
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12 (avctx->codec_id == AV_CODEC_ID_ZLIB && avctx->extradata[7] != CODEC_ZLIB)) {
493 av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
494 }
495
496 /* Detect image type */
497
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12 switch (c->imgtype = avctx->extradata[4]) {
498 case IMGTYPE_YUV111:
499 c->decomp_size = basesize * 3;
500 max_decomp_size = max_basesize * 3;
501 avctx->pix_fmt = AV_PIX_FMT_YUV444P;
502 av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
503 break;
504 case IMGTYPE_YUV422:
505 c->decomp_size = basesize * 2;
506 max_decomp_size = max_basesize * 2;
507 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
508 av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
509 if (avctx->width % 4) {
510 avpriv_request_sample(avctx, "Unsupported dimensions");
511 return AVERROR_INVALIDDATA;
512 }
513 break;
514 12 case IMGTYPE_RGB24:
515 12 c->decomp_size = basesize * 3;
516 12 max_decomp_size = max_basesize * 3;
517 12 avctx->pix_fmt = AV_PIX_FMT_BGR24;
518 12 av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
519 12 break;
520 case IMGTYPE_YUV411:
521 c->decomp_size = basesize / 2 * 3;
522 max_decomp_size = max_basesize / 2 * 3;
523 avctx->pix_fmt = AV_PIX_FMT_YUV411P;
524 av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
525 break;
526 case IMGTYPE_YUV211:
527 c->decomp_size = basesize * 2;
528 max_decomp_size = max_basesize * 2;
529 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
530 av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");
531 break;
532 case IMGTYPE_YUV420:
533 c->decomp_size = basesize / 2 * 3;
534 max_decomp_size = max_basesize / 2 * 3;
535 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
536 av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");
537 break;
538 default:
539 av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
540 return AVERROR_INVALIDDATA;
541 }
542
543 12 av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &subsample_h, &subsample_v);
544
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12 if (avctx->width % (1<<subsample_h) || avctx->height % (1<<subsample_v)) {
545 avpriv_request_sample(avctx, "Unsupported dimensions");
546 return AVERROR_INVALIDDATA;
547 }
548
549 /* Detect compression method */
550 12 c->compression = (int8_t)avctx->extradata[5];
551
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12 switch (avctx->codec_id) {
552 2 case AV_CODEC_ID_MSZH:
553
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2 switch (c->compression) {
554 2 case COMP_MSZH:
555 2 av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");
556 2 break;
557 case COMP_MSZH_NOCOMP:
558 c->decomp_size = 0;
559 av_log(avctx, AV_LOG_DEBUG, "No compression.\n");
560 break;
561 default:
562 av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
563 return AVERROR_INVALIDDATA;
564 }
565 2 break;
566 #if CONFIG_ZLIB_DECODER
567 10 case AV_CODEC_ID_ZLIB:
568
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10 switch (c->compression) {
569 case COMP_ZLIB_HISPEED:
570 av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");
571 break;
572 2 case COMP_ZLIB_HICOMP:
573 2 av_log(avctx, AV_LOG_DEBUG, "High compression.\n");
574 2 break;
575 8 case COMP_ZLIB_NORMAL:
576 8 av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");
577 8 break;
578 default:
579 if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {
580 av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
581 return AVERROR_INVALIDDATA;
582 }
583 av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);
584 }
585 10 break;
586 #endif
587 default:
588 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
589 return AVERROR_INVALIDDATA;
590 }
591
592 /* Allocate decompression buffer */
593
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12 if (c->decomp_size) {
594
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12 if (!(c->decomp_buf = av_malloc(max_decomp_size))) {
595 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
596 return AVERROR(ENOMEM);
597 }
598 }
599
600 /* Detect flags */
601 12 c->flags = avctx->extradata[6];
602
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12 if (c->flags & FLAG_MULTITHREAD)
603 av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
604
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12 if (c->flags & FLAG_NULLFRAME)
605 av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
606
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12 if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
607 av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
608
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12 if (c->flags & FLAGMASK_UNUSED)
609 av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
610
611 /* If needed init zlib */
612 #if CONFIG_ZLIB_DECODER
613
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12 if (avctx->codec_id == AV_CODEC_ID_ZLIB)
614 10 return ff_inflate_init(&c->zstream, avctx);
615 #endif
616
617 2 return 0;
618 }
619
620 12 static av_cold int decode_end(AVCodecContext *avctx)
621 {
622 12 LclDecContext * const c = avctx->priv_data;
623
624 12 av_freep(&c->decomp_buf);
625 #if CONFIG_ZLIB_DECODER
626 12 ff_inflate_end(&c->zstream);
627 #endif
628
629 12 return 0;
630 }
631
632 #if CONFIG_MSZH_DECODER
633 const FFCodec ff_mszh_decoder = {
634 .p.name = "mszh",
635 .p.long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
636 .p.type = AVMEDIA_TYPE_VIDEO,
637 .p.id = AV_CODEC_ID_MSZH,
638 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
639 .priv_data_size = sizeof(LclDecContext),
640 .init = decode_init,
641 .close = decode_end,
642 FF_CODEC_DECODE_CB(decode_frame),
643 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
644 };
645 #endif
646
647 #if CONFIG_ZLIB_DECODER
648 const FFCodec ff_zlib_decoder = {
649 .p.name = "zlib",
650 .p.long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
651 .p.type = AVMEDIA_TYPE_VIDEO,
652 .p.id = AV_CODEC_ID_ZLIB,
653 .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
654 .priv_data_size = sizeof(LclDecContext),
655 .init = decode_init,
656 .close = decode_end,
657 FF_CODEC_DECODE_CB(decode_frame),
658 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
659 };
660 #endif
661