Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / lcldec.c
CommitLineData
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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
41#include <stdio.h>
42#include <stdlib.h>
43
44#include "libavutil/mem.h"
45#include "libavutil/pixdesc.h"
46#include "avcodec.h"
47#include "bytestream.h"
48#include "internal.h"
49#include "lcl.h"
50
51#if CONFIG_ZLIB_DECODER
52#include <zlib.h>
53#endif
54
55/*
56 * Decoder context
57 */
58typedef 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 z_stream 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 */
79static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
80{
81 unsigned char *destptr_bak = destptr;
82 unsigned char *destptr_end = destptr + destsize;
83 const unsigned char *srcptr_end = srcptr + srclen;
84 unsigned mask = *srcptr++;
85 unsigned maskbit = 0x80;
86
87 while (srcptr < srcptr_end && destptr < destptr_end) {
88 if (!(mask & maskbit)) {
89 memcpy(destptr, srcptr, 4);
90 destptr += 4;
91 srcptr += 4;
92 } else {
93 unsigned ofs = bytestream_get_le16(&srcptr);
94 unsigned cnt = (ofs >> 11) + 1;
95 ofs &= 0x7ff;
96 ofs = FFMIN(ofs, destptr - destptr_bak);
97 cnt *= 4;
98 cnt = FFMIN(cnt, destptr_end - destptr);
99 if (ofs) {
100 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 destptr += cnt;
107 }
108 maskbit >>= 1;
109 if (!maskbit) {
110 mask = *srcptr++;
111 while (!mask) {
112 if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;
113 memcpy(destptr, srcptr, 32);
114 destptr += 32;
115 srcptr += 32;
116 mask = *srcptr++;
117 }
118 maskbit = 0x80;
119 }
120 }
121
122 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 */
134static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
135{
136 LclDecContext *c = avctx->priv_data;
137 int zret = inflateReset(&c->zstream);
138 if (zret != Z_OK) {
139 av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
140 return AVERROR_UNKNOWN;
141 }
142 c->zstream.next_in = (uint8_t *)src;
143 c->zstream.avail_in = src_len;
144 c->zstream.next_out = c->decomp_buf + offset;
145 c->zstream.avail_out = c->decomp_size - offset;
146 zret = inflate(&c->zstream, Z_FINISH);
147 if (zret != Z_OK && zret != Z_STREAM_END) {
148 av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
149 return AVERROR_UNKNOWN;
150 }
151 if (expected != (unsigned int)c->zstream.total_out) {
152 av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
153 expected, c->zstream.total_out);
154 return AVERROR_UNKNOWN;
155 }
156 return c->zstream.total_out;
157}
158#endif
159
160
161/*
162 *
163 * Decode a frame
164 *
165 */
166static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
167{
168 AVFrame *frame = data;
169 const uint8_t *buf = avpkt->data;
170 int buf_size = avpkt->size;
171 LclDecContext * const c = avctx->priv_data;
172 unsigned int pixel_ptr;
173 int row, col;
174 unsigned char *encoded = avpkt->data, *outptr;
175 uint8_t *y_out, *u_out, *v_out;
176 unsigned int width = avctx->width; // Real image width
177 unsigned int height = avctx->height; // Real image height
178 unsigned int mszh_dlen;
179 unsigned char yq, y1q, uq, vq;
180 int uqvq, ret;
181 unsigned int mthread_inlen, mthread_outlen;
182 unsigned int len = buf_size;
f6fa7814 183 int linesize;
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184
185 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
186 return ret;
187
188 outptr = frame->data[0]; // Output image pointer
189
190 /* Decompress frame */
191 switch (avctx->codec_id) {
192 case AV_CODEC_ID_MSZH:
193 switch (c->compression) {
194 case COMP_MSZH:
f6fa7814 195 if (c->imgtype == IMGTYPE_RGB24 && len == FFALIGN(width * 3, 4) * height ||
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196 c->imgtype == IMGTYPE_YUV111 && len == width * height * 3) {
197 ;
198 } else if (c->flags & FLAG_MULTITHREAD) {
199 mthread_inlen = AV_RL32(buf);
200 if (len < 8) {
201 av_log(avctx, AV_LOG_ERROR, "len %d is too small\n", len);
202 return AVERROR_INVALIDDATA;
203 }
204 mthread_inlen = FFMIN(mthread_inlen, len - 8);
205 mthread_outlen = AV_RL32(buf + 4);
206 mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
207 mszh_dlen = mszh_decomp(buf + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
208 if (mthread_outlen != mszh_dlen) {
209 av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
210 mthread_outlen, mszh_dlen);
211 return AVERROR_INVALIDDATA;
212 }
213 mszh_dlen = mszh_decomp(buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
214 c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
215 if (mthread_outlen != mszh_dlen) {
216 av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
217 mthread_outlen, mszh_dlen);
218 return AVERROR_INVALIDDATA;
219 }
220 encoded = c->decomp_buf;
221 len = c->decomp_size;
222 } else {
223 mszh_dlen = mszh_decomp(buf, len, c->decomp_buf, c->decomp_size);
224 if (c->decomp_size != mszh_dlen) {
225 av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
226 c->decomp_size, mszh_dlen);
227 return AVERROR_INVALIDDATA;
228 }
229 encoded = c->decomp_buf;
230 len = mszh_dlen;
231 }
232 break;
233 case COMP_MSZH_NOCOMP: {
234 int bppx2;
235 switch (c->imgtype) {
236 case IMGTYPE_YUV111:
237 case IMGTYPE_RGB24:
238 bppx2 = 6;
239 break;
240 case IMGTYPE_YUV422:
241 case IMGTYPE_YUV211:
242 bppx2 = 4;
243 break;
244 case IMGTYPE_YUV411:
245 case IMGTYPE_YUV420:
246 bppx2 = 3;
247 break;
248 default:
249 bppx2 = 0; // will error out below
250 break;
251 }
252 if (len < ((width * height * bppx2) >> 1))
253 return AVERROR_INVALIDDATA;
254 break;
255 }
256 default:
257 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
258 return AVERROR_INVALIDDATA;
259 }
260 break;
261#if CONFIG_ZLIB_DECODER
262 case AV_CODEC_ID_ZLIB:
263 /* Using the original dll with normal compression (-1) and RGB format
264 * gives a file with ZLIB fourcc, but frame is really uncompressed.
265 * To be sure that's true check also frame size */
266 if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
267 len == width * height * 3) {
268 if (c->flags & FLAG_PNGFILTER) {
269 memcpy(c->decomp_buf, buf, len);
270 encoded = c->decomp_buf;
271 } else {
272 break;
273 }
274 } else if (c->flags & FLAG_MULTITHREAD) {
275 mthread_inlen = AV_RL32(buf);
276 mthread_inlen = FFMIN(mthread_inlen, len - 8);
277 mthread_outlen = AV_RL32(buf + 4);
278 mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
279 ret = zlib_decomp(avctx, buf + 8, mthread_inlen, 0, mthread_outlen);
280 if (ret < 0) return ret;
281 ret = zlib_decomp(avctx, buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
282 mthread_outlen, mthread_outlen);
283 if (ret < 0) return ret;
284 } else {
285 int ret = zlib_decomp(avctx, buf, len, 0, c->decomp_size);
286 if (ret < 0) return ret;
287 }
288 encoded = c->decomp_buf;
289 len = c->decomp_size;
290 break;
291#endif
292 default:
293 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
294 return AVERROR_INVALIDDATA;
295 }
296
297
298 /* Apply PNG filter */
299 if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {
300 switch (c->imgtype) {
301 case IMGTYPE_YUV111:
302 case IMGTYPE_RGB24:
303 for (row = 0; row < height; row++) {
304 pixel_ptr = row * width * 3;
305 yq = encoded[pixel_ptr++];
306 uqvq = AV_RL16(encoded+pixel_ptr);
307 pixel_ptr += 2;
308 for (col = 1; col < width; col++) {
309 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
310 uqvq -= AV_RL16(encoded+pixel_ptr+1);
311 AV_WL16(encoded+pixel_ptr+1, uqvq);
312 pixel_ptr += 3;
313 }
314 }
315 break;
316 case IMGTYPE_YUV422:
317 for (row = 0; row < height; row++) {
318 pixel_ptr = row * width * 2;
319 yq = uq = vq =0;
320 for (col = 0; col < width/4; col++) {
321 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
322 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
323 encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
324 encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
325 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
326 encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
327 encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
328 encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
329 pixel_ptr += 8;
330 }
331 }
332 break;
333 case IMGTYPE_YUV411:
334 for (row = 0; row < height; row++) {
335 pixel_ptr = row * width / 2 * 3;
336 yq = uq = vq =0;
337 for (col = 0; col < width/4; col++) {
338 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
339 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
340 encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
341 encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
342 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
343 encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
344 pixel_ptr += 6;
345 }
346 }
347 break;
348 case IMGTYPE_YUV211:
349 for (row = 0; row < height; row++) {
350 pixel_ptr = row * width * 2;
351 yq = uq = vq =0;
352 for (col = 0; col < width/2; col++) {
353 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
354 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
355 encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
356 encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
357 pixel_ptr += 4;
358 }
359 }
360 break;
361 case IMGTYPE_YUV420:
362 for (row = 0; row < height/2; row++) {
363 pixel_ptr = row * width * 3;
364 yq = y1q = uq = vq =0;
365 for (col = 0; col < width/2; col++) {
366 encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
367 encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
368 encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
369 encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
370 encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
371 encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
372 pixel_ptr += 6;
373 }
374 }
375 break;
376 default:
377 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
378 return AVERROR_INVALIDDATA;
379 }
380 }
381
382 /* Convert colorspace */
383 y_out = frame->data[0] + (height - 1) * frame->linesize[0];
384 u_out = frame->data[1] + (height - 1) * frame->linesize[1];
385 v_out = frame->data[2] + (height - 1) * frame->linesize[2];
386 switch (c->imgtype) {
387 case IMGTYPE_YUV111:
388 for (row = 0; row < height; row++) {
389 for (col = 0; col < width; col++) {
390 y_out[col] = *encoded++;
391 u_out[col] = *encoded++ + 128;
392 v_out[col] = *encoded++ + 128;
393 }
394 y_out -= frame->linesize[0];
395 u_out -= frame->linesize[1];
396 v_out -= frame->linesize[2];
397 }
398 break;
399 case IMGTYPE_YUV422:
400 for (row = 0; row < height; row++) {
401 for (col = 0; col < width - 3; col += 4) {
402 memcpy(y_out + col, encoded, 4);
403 encoded += 4;
404 u_out[ col >> 1 ] = *encoded++ + 128;
405 u_out[(col >> 1) + 1] = *encoded++ + 128;
406 v_out[ col >> 1 ] = *encoded++ + 128;
407 v_out[(col >> 1) + 1] = *encoded++ + 128;
408 }
409 y_out -= frame->linesize[0];
410 u_out -= frame->linesize[1];
411 v_out -= frame->linesize[2];
412 }
413 break;
414 case IMGTYPE_RGB24:
f6fa7814 415 linesize = len < FFALIGN(3 * width, 4) * height ? 3 * width : FFALIGN(3 * width, 4);
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416 for (row = height - 1; row >= 0; row--) {
417 pixel_ptr = row * frame->linesize[0];
418 memcpy(outptr + pixel_ptr, encoded, 3 * width);
f6fa7814 419 encoded += linesize;
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420 }
421 break;
422 case IMGTYPE_YUV411:
423 for (row = 0; row < height; row++) {
424 for (col = 0; col < width - 3; col += 4) {
425 memcpy(y_out + col, encoded, 4);
426 encoded += 4;
427 u_out[col >> 2] = *encoded++ + 128;
428 v_out[col >> 2] = *encoded++ + 128;
429 }
430 y_out -= frame->linesize[0];
431 u_out -= frame->linesize[1];
432 v_out -= frame->linesize[2];
433 }
434 break;
435 case IMGTYPE_YUV211:
436 for (row = 0; row < height; row++) {
437 for (col = 0; col < width - 1; col += 2) {
438 memcpy(y_out + col, encoded, 2);
439 encoded += 2;
440 u_out[col >> 1] = *encoded++ + 128;
441 v_out[col >> 1] = *encoded++ + 128;
442 }
443 y_out -= frame->linesize[0];
444 u_out -= frame->linesize[1];
445 v_out -= frame->linesize[2];
446 }
447 break;
448 case IMGTYPE_YUV420:
449 u_out = frame->data[1] + ((height >> 1) - 1) * frame->linesize[1];
450 v_out = frame->data[2] + ((height >> 1) - 1) * frame->linesize[2];
451 for (row = 0; row < height - 1; row += 2) {
452 for (col = 0; col < width - 1; col += 2) {
453 memcpy(y_out + col, encoded, 2);
454 encoded += 2;
455 memcpy(y_out + col - frame->linesize[0], encoded, 2);
456 encoded += 2;
457 u_out[col >> 1] = *encoded++ + 128;
458 v_out[col >> 1] = *encoded++ + 128;
459 }
460 y_out -= frame->linesize[0] << 1;
461 u_out -= frame->linesize[1];
462 v_out -= frame->linesize[2];
463 }
464 break;
465 default:
466 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
467 return AVERROR_INVALIDDATA;
468 }
469
470 *got_frame = 1;
471
472 /* always report that the buffer was completely consumed */
473 return buf_size;
474}
475
476/*
477 *
478 * Init lcl decoder
479 *
480 */
481static av_cold int decode_init(AVCodecContext *avctx)
482{
483 LclDecContext * const c = avctx->priv_data;
484 unsigned int basesize = avctx->width * avctx->height;
485 unsigned int max_basesize = FFALIGN(avctx->width, 4) *
486 FFALIGN(avctx->height, 4);
487 unsigned int max_decomp_size;
488 int subsample_h, subsample_v;
489
490 if (avctx->extradata_size < 8) {
491 av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
492 return AVERROR_INVALIDDATA;
493 }
494
495 /* Check codec type */
496 if ((avctx->codec_id == AV_CODEC_ID_MSZH && avctx->extradata[7] != CODEC_MSZH) ||
497 (avctx->codec_id == AV_CODEC_ID_ZLIB && avctx->extradata[7] != CODEC_ZLIB)) {
498 av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
499 }
500
501 /* Detect image type */
502 switch (c->imgtype = avctx->extradata[4]) {
503 case IMGTYPE_YUV111:
504 c->decomp_size = basesize * 3;
505 max_decomp_size = max_basesize * 3;
506 avctx->pix_fmt = AV_PIX_FMT_YUV444P;
507 av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
508 break;
509 case IMGTYPE_YUV422:
510 c->decomp_size = basesize * 2;
511 max_decomp_size = max_basesize * 2;
512 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
513 av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
514 if (avctx->width % 4) {
515 avpriv_request_sample(avctx, "Unsupported dimensions\n");
516 return AVERROR_INVALIDDATA;
517 }
518 break;
519 case IMGTYPE_RGB24:
520 c->decomp_size = basesize * 3;
521 max_decomp_size = max_basesize * 3;
522 avctx->pix_fmt = AV_PIX_FMT_BGR24;
523 av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
524 break;
525 case IMGTYPE_YUV411:
526 c->decomp_size = basesize / 2 * 3;
527 max_decomp_size = max_basesize / 2 * 3;
528 avctx->pix_fmt = AV_PIX_FMT_YUV411P;
529 av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
530 break;
531 case IMGTYPE_YUV211:
532 c->decomp_size = basesize * 2;
533 max_decomp_size = max_basesize * 2;
534 avctx->pix_fmt = AV_PIX_FMT_YUV422P;
535 av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");
536 break;
537 case IMGTYPE_YUV420:
538 c->decomp_size = basesize / 2 * 3;
539 max_decomp_size = max_basesize / 2 * 3;
540 avctx->pix_fmt = AV_PIX_FMT_YUV420P;
541 av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");
542 break;
543 default:
544 av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
545 return AVERROR_INVALIDDATA;
546 }
547
548 av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &subsample_h, &subsample_v);
549 if (avctx->width % (1<<subsample_h) || avctx->height % (1<<subsample_v)) {
550 avpriv_request_sample(avctx, "Unsupported dimensions\n");
551 return AVERROR_INVALIDDATA;
552 }
553
554 /* Detect compression method */
555 c->compression = (int8_t)avctx->extradata[5];
556 switch (avctx->codec_id) {
557 case AV_CODEC_ID_MSZH:
558 switch (c->compression) {
559 case COMP_MSZH:
560 av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");
561 break;
562 case COMP_MSZH_NOCOMP:
563 c->decomp_size = 0;
564 av_log(avctx, AV_LOG_DEBUG, "No compression.\n");
565 break;
566 default:
567 av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
568 return AVERROR_INVALIDDATA;
569 }
570 break;
571#if CONFIG_ZLIB_DECODER
572 case AV_CODEC_ID_ZLIB:
573 switch (c->compression) {
574 case COMP_ZLIB_HISPEED:
575 av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");
576 break;
577 case COMP_ZLIB_HICOMP:
578 av_log(avctx, AV_LOG_DEBUG, "High compression.\n");
579 break;
580 case COMP_ZLIB_NORMAL:
581 av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");
582 break;
583 default:
584 if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {
585 av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
586 return AVERROR_INVALIDDATA;
587 }
588 av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);
589 }
590 break;
591#endif
592 default:
593 av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
594 return AVERROR_INVALIDDATA;
595 }
596
597 /* Allocate decompression buffer */
598 if (c->decomp_size) {
599 if (!(c->decomp_buf = av_malloc(max_decomp_size))) {
600 av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
601 return AVERROR(ENOMEM);
602 }
603 }
604
605 /* Detect flags */
606 c->flags = avctx->extradata[6];
607 if (c->flags & FLAG_MULTITHREAD)
608 av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
609 if (c->flags & FLAG_NULLFRAME)
610 av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
611 if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
612 av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
613 if (c->flags & FLAGMASK_UNUSED)
614 av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
615
616 /* If needed init zlib */
617#if CONFIG_ZLIB_DECODER
618 if (avctx->codec_id == AV_CODEC_ID_ZLIB) {
619 int zret;
620 c->zstream.zalloc = Z_NULL;
621 c->zstream.zfree = Z_NULL;
622 c->zstream.opaque = Z_NULL;
623 zret = inflateInit(&c->zstream);
624 if (zret != Z_OK) {
625 av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
626 av_freep(&c->decomp_buf);
627 return AVERROR_UNKNOWN;
628 }
629 }
630#endif
631
632 return 0;
633}
634
635/*
636 *
637 * Uninit lcl decoder
638 *
639 */
640static av_cold int decode_end(AVCodecContext *avctx)
641{
642 LclDecContext * const c = avctx->priv_data;
643
644 av_freep(&c->decomp_buf);
645#if CONFIG_ZLIB_DECODER
646 if (avctx->codec_id == AV_CODEC_ID_ZLIB)
647 inflateEnd(&c->zstream);
648#endif
649
650 return 0;
651}
652
653#if CONFIG_MSZH_DECODER
654AVCodec ff_mszh_decoder = {
655 .name = "mszh",
656 .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
657 .type = AVMEDIA_TYPE_VIDEO,
658 .id = AV_CODEC_ID_MSZH,
659 .priv_data_size = sizeof(LclDecContext),
660 .init = decode_init,
661 .close = decode_end,
662 .decode = decode_frame,
663 .capabilities = CODEC_CAP_DR1,
664};
665#endif
666
667#if CONFIG_ZLIB_DECODER
668AVCodec ff_zlib_decoder = {
669 .name = "zlib",
670 .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
671 .type = AVMEDIA_TYPE_VIDEO,
672 .id = AV_CODEC_ID_ZLIB,
673 .priv_data_size = sizeof(LclDecContext),
674 .init = decode_init,
675 .close = decode_end,
676 .decode = decode_frame,
677 .capabilities = CODEC_CAP_DR1,
678};
679#endif