path: root/libavcodec/lcldec.c (plain)
blob: f5040c6609f659a46d5e11097c546f51ab2eba0b

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 <stdio.h>
41	#include <stdlib.h>
42
43	#include "libavutil/mem.h"
44	#include "libavutil/pixdesc.h"
45	#include "avcodec.h"
46	#include "bytestream.h"
47	#include "internal.h"
48	#include "lcl.h"
49
50	#if CONFIG_ZLIB_DECODER
51	#include <zlib.h>
52	#endif
53
54	typedef struct LclDecContext {
55	// Image type
56	int imgtype;
57	// Compression type
58	int compression;
59	// Flags
60	int flags;
61	// Decompressed data size
62	unsigned int decomp_size;
63	// Decompression buffer
64	unsigned char* decomp_buf;
65	#if CONFIG_ZLIB_DECODER
66	z_stream zstream;
67	#endif
68	} LclDecContext;
69
70
71	/**
72	* @param srcptr compressed source buffer, must be padded with at least 5 extra bytes
73	* @param destptr must be padded sufficiently for av_memcpy_backptr
74	*/
75	static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
76	{
77	unsigned char *destptr_bak = destptr;
78	unsigned char *destptr_end = destptr + destsize;
79	const unsigned char *srcptr_end = srcptr + srclen;
80	unsigned mask = *srcptr++;
81	unsigned maskbit = 0x80;
82
83	while (srcptr < srcptr_end && destptr < destptr_end) {
84	if (!(mask & maskbit)) {
85	memcpy(destptr, srcptr, 4);
86	destptr += 4;
87	srcptr += 4;
88	} else {
89	unsigned ofs = bytestream_get_le16(&srcptr);
90	unsigned cnt = (ofs >> 11) + 1;
91	ofs &= 0x7ff;
92	ofs = FFMIN(ofs, destptr - destptr_bak);
93	cnt *= 4;
94	cnt = FFMIN(cnt, destptr_end - destptr);
95	if (ofs) {
96	av_memcpy_backptr(destptr, ofs, cnt);
97	} else {
98	// Not known what the correct behaviour is, but
99	// this at least avoids uninitialized data.
100	memset(destptr, 0, cnt);
101	}
102	destptr += cnt;
103	}
104	maskbit >>= 1;
105	if (!maskbit) {
106	mask = *srcptr++;
107	while (!mask) {
108	if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;
109	memcpy(destptr, srcptr, 32);
110	destptr += 32;
111	srcptr += 32;
112	mask = *srcptr++;
113	}
114	maskbit = 0x80;
115	}
116	}
117
118	return destptr - destptr_bak;
119	}
120
121
122	#if CONFIG_ZLIB_DECODER
123	/**
124	* @brief decompress a zlib-compressed data block into decomp_buf
125	* @param src compressed input buffer
126	* @param src_len data length in input buffer
127	* @param offset offset in decomp_buf
128	* @param expected expected decompressed length
129	*/
130	static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
131	{
132	LclDecContext *c = avctx->priv_data;
133	int zret = inflateReset(&c->zstream);
134	if (zret != Z_OK) {
135	av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
136	return AVERROR_UNKNOWN;
137	}
138	c->zstream.next_in = (uint8_t *)src;
139	c->zstream.avail_in = src_len;
140	c->zstream.next_out = c->decomp_buf + offset;
141	c->zstream.avail_out = c->decomp_size - offset;
142	zret = inflate(&c->zstream, Z_FINISH);
143	if (zret != Z_OK && zret != Z_STREAM_END) {
144	av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
145	return AVERROR_UNKNOWN;
146	}
147	if (expected != (unsigned int)c->zstream.total_out) {
148	av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
149	expected, c->zstream.total_out);
150	return AVERROR_UNKNOWN;
151	}
152	return c->zstream.total_out;
153	}
154	#endif
155
156
157	static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
158	{
159	AVFrame *frame = data;
160	const uint8_t *buf = avpkt->data;
161	int buf_size = avpkt->size;
162	LclDecContext * const c = avctx->priv_data;
163	unsigned int pixel_ptr;
164	int row, col;
165	unsigned char *encoded = avpkt->data, *outptr;
166	uint8_t *y_out, *u_out, *v_out;
167	unsigned int width = avctx->width; // Real image width
168	unsigned int height = avctx->height; // Real image height
169	unsigned int mszh_dlen;
170	unsigned char yq, y1q, uq, vq;
171	int uqvq, ret;
172	unsigned int mthread_inlen, mthread_outlen;
173	unsigned int len = buf_size;
174	int linesize;
175
176	if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
177	return ret;
178
179	outptr = frame->data[0]; // Output image pointer
180
181	/* Decompress frame */
182	switch (avctx->codec_id) {
183	case AV_CODEC_ID_MSZH:
184	switch (c->compression) {
185	case COMP_MSZH:
186	if (c->imgtype == IMGTYPE_RGB24 && len == FFALIGN(width * 3, 4) * height ||
187	c->imgtype == IMGTYPE_YUV111 && len == width * height * 3) {
188	;
189	} else if (c->flags & FLAG_MULTITHREAD) {
190	mthread_inlen = AV_RL32(buf);
191	if (len < 8) {
192	av_log(avctx, AV_LOG_ERROR, "len %d is too small\n", len);
193	return AVERROR_INVALIDDATA;
194	}
195	mthread_inlen = FFMIN(mthread_inlen, len - 8);
196	mthread_outlen = AV_RL32(buf + 4);
197	mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
198	mszh_dlen = mszh_decomp(buf + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
199	if (mthread_outlen != mszh_dlen) {
200	av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
201	mthread_outlen, mszh_dlen);
202	return AVERROR_INVALIDDATA;
203	}
204	mszh_dlen = mszh_decomp(buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
205	c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
206	if (mthread_outlen != mszh_dlen) {
207	av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
208	mthread_outlen, mszh_dlen);
209	return AVERROR_INVALIDDATA;
210	}
211	encoded = c->decomp_buf;
212	len = c->decomp_size;
213	} else {
214	mszh_dlen = mszh_decomp(buf, len, c->decomp_buf, c->decomp_size);
215	if (c->decomp_size != mszh_dlen) {
216	av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
217	c->decomp_size, mszh_dlen);
218	return AVERROR_INVALIDDATA;
219	}
220	encoded = c->decomp_buf;
221	len = mszh_dlen;
222	}
223	break;
224	case COMP_MSZH_NOCOMP: {
225	int bppx2;
226	switch (c->imgtype) {
227	case IMGTYPE_YUV111:
228	case IMGTYPE_RGB24:
229	bppx2 = 6;
230	break;
231	case IMGTYPE_YUV422:
232	case IMGTYPE_YUV211:
233	bppx2 = 4;
234	break;
235	case IMGTYPE_YUV411:
236	case IMGTYPE_YUV420:
237	bppx2 = 3;
238	break;
239	default:
240	bppx2 = 0; // will error out below
241	break;
242	}
243	if (len < ((width * height * bppx2) >> 1))
244	return AVERROR_INVALIDDATA;
245	break;
246	}
247	default:
248	av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
249	return AVERROR_INVALIDDATA;
250	}
251	break;
252	#if CONFIG_ZLIB_DECODER
253	case AV_CODEC_ID_ZLIB:
254	/* Using the original dll with normal compression (-1) and RGB format
255	* gives a file with ZLIB fourcc, but frame is really uncompressed.
256	* To be sure that's true check also frame size */
257	if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
258	len == width * height * 3) {
259	if (c->flags & FLAG_PNGFILTER) {
260	memcpy(c->decomp_buf, buf, len);
261	encoded = c->decomp_buf;
262	} else {
263	break;
264	}
265	} else if (c->flags & FLAG_MULTITHREAD) {
266	mthread_inlen = AV_RL32(buf);
267	mthread_inlen = FFMIN(mthread_inlen, len - 8);
268	mthread_outlen = AV_RL32(buf + 4);
269	mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
270	ret = zlib_decomp(avctx, buf + 8, mthread_inlen, 0, mthread_outlen);
271	if (ret < 0) return ret;
272	ret = zlib_decomp(avctx, buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
273	mthread_outlen, mthread_outlen);
274	if (ret < 0) return ret;
275	} else {
276	int ret = zlib_decomp(avctx, buf, len, 0, c->decomp_size);
277	if (ret < 0) return ret;
278	}
279	encoded = c->decomp_buf;
280	len = c->decomp_size;
281	break;
282	#endif
283	default:
284	av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
285	return AVERROR_INVALIDDATA;
286	}
287
288
289	/* Apply PNG filter */
290	if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {
291	switch (c->imgtype) {
292	case IMGTYPE_YUV111:
293	case IMGTYPE_RGB24:
294	for (row = 0; row < height; row++) {
295	pixel_ptr = row * width * 3;
296	yq = encoded[pixel_ptr++];
297	uqvq = AV_RL16(encoded+pixel_ptr);
298	pixel_ptr += 2;
299	for (col = 1; col < width; col++) {
300	encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
301	uqvq -= AV_RL16(encoded+pixel_ptr+1);
302	AV_WL16(encoded+pixel_ptr+1, uqvq);
303	pixel_ptr += 3;
304	}
305	}
306	break;
307	case IMGTYPE_YUV422:
308	for (row = 0; row < height; row++) {
309	pixel_ptr = row * width * 2;
310	yq = uq = vq =0;
311	for (col = 0; col < width/4; col++) {
312	encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
313	encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
314	encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
315	encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
316	encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
317	encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
318	encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
319	encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
320	pixel_ptr += 8;
321	}
322	}
323	break;
324	case IMGTYPE_YUV411:
325	for (row = 0; row < height; row++) {
326	pixel_ptr = row * width / 2 * 3;
327	yq = uq = vq =0;
328	for (col = 0; col < width/4; col++) {
329	encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
330	encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
331	encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
332	encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
333	encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
334	encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
335	pixel_ptr += 6;
336	}
337	}
338	break;
339	case IMGTYPE_YUV211:
340	for (row = 0; row < height; row++) {
341	pixel_ptr = row * width * 2;
342	yq = uq = vq =0;
343	for (col = 0; col < width/2; col++) {
344	encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
345	encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
346	encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
347	encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
348	pixel_ptr += 4;
349	}
350	}
351	break;
352	case IMGTYPE_YUV420:
353	for (row = 0; row < height/2; row++) {
354	pixel_ptr = row * width * 3;
355	yq = y1q = uq = vq =0;
356	for (col = 0; col < width/2; col++) {
357	encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
358	encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
359	encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
360	encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
361	encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
362	encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
363	pixel_ptr += 6;
364	}
365	}
366	break;
367	default:
368	av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
369	return AVERROR_INVALIDDATA;
370	}
371	}
372
373	/* Convert colorspace */
374	y_out = frame->data[0] + (height - 1) * frame->linesize[0];
375	u_out = frame->data[1] + (height - 1) * frame->linesize[1];
376	v_out = frame->data[2] + (height - 1) * frame->linesize[2];
377	switch (c->imgtype) {
378	case IMGTYPE_YUV111:
379	for (row = 0; row < height; row++) {
380	for (col = 0; col < width; col++) {
381	y_out[col] = *encoded++;
382	u_out[col] = *encoded++ + 128;
383	v_out[col] = *encoded++ + 128;
384	}
385	y_out -= frame->linesize[0];
386	u_out -= frame->linesize[1];
387	v_out -= frame->linesize[2];
388	}
389	break;
390	case IMGTYPE_YUV422:
391	for (row = 0; row < height; row++) {
392	for (col = 0; col < width - 3; col += 4) {
393	memcpy(y_out + col, encoded, 4);
394	encoded += 4;
395	u_out[ col >> 1 ] = *encoded++ + 128;
396	u_out[(col >> 1) + 1] = *encoded++ + 128;
397	v_out[ col >> 1 ] = *encoded++ + 128;
398	v_out[(col >> 1) + 1] = *encoded++ + 128;
399	}
400	y_out -= frame->linesize[0];
401	u_out -= frame->linesize[1];
402	v_out -= frame->linesize[2];
403	}
404	break;
405	case IMGTYPE_RGB24:
406	linesize = len < FFALIGN(3 * width, 4) * height ? 3 * width : FFALIGN(3 * width, 4);
407	for (row = height - 1; row >= 0; row--) {
408	pixel_ptr = row * frame->linesize[0];
409	memcpy(outptr + pixel_ptr, encoded, 3 * width);
410	encoded += linesize;
411	}
412	break;
413	case IMGTYPE_YUV411:
414	for (row = 0; row < height; row++) {
415	for (col = 0; col < width - 3; col += 4) {
416	memcpy(y_out + col, encoded, 4);
417	encoded += 4;
418	u_out[col >> 2] = *encoded++ + 128;
419	v_out[col >> 2] = *encoded++ + 128;
420	}
421	y_out -= frame->linesize[0];
422	u_out -= frame->linesize[1];
423	v_out -= frame->linesize[2];
424	}
425	break;
426	case IMGTYPE_YUV211:
427	for (row = 0; row < height; row++) {
428	for (col = 0; col < width - 1; col += 2) {
429	memcpy(y_out + col, encoded, 2);
430	encoded += 2;
431	u_out[col >> 1] = *encoded++ + 128;
432	v_out[col >> 1] = *encoded++ + 128;
433	}
434	y_out -= frame->linesize[0];
435	u_out -= frame->linesize[1];
436	v_out -= frame->linesize[2];
437	}
438	break;
439	case IMGTYPE_YUV420:
440	u_out = frame->data[1] + ((height >> 1) - 1) * frame->linesize[1];
441	v_out = frame->data[2] + ((height >> 1) - 1) * frame->linesize[2];
442	for (row = 0; row < height - 1; row += 2) {
443	for (col = 0; col < width - 1; col += 2) {
444	memcpy(y_out + col, encoded, 2);
445	encoded += 2;
446	memcpy(y_out + col - frame->linesize[0], encoded, 2);
447	encoded += 2;
448	u_out[col >> 1] = *encoded++ + 128;
449	v_out[col >> 1] = *encoded++ + 128;
450	}
451	y_out -= frame->linesize[0] << 1;
452	u_out -= frame->linesize[1];
453	v_out -= frame->linesize[2];
454	}
455	break;
456	default:
457	av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
458	return AVERROR_INVALIDDATA;
459	}
460
461	*got_frame = 1;
462
463	/* always report that the buffer was completely consumed */
464	return buf_size;
465	}
466
467	static av_cold int decode_init(AVCodecContext *avctx)
468	{
469	LclDecContext * const c = avctx->priv_data;
470	unsigned int basesize = avctx->width * avctx->height;
471	unsigned int max_basesize = FFALIGN(avctx->width, 4) *
472	FFALIGN(avctx->height, 4);
473	unsigned int max_decomp_size;
474	int subsample_h, subsample_v;
475
476	if (avctx->extradata_size < 8) {
477	av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
478	return AVERROR_INVALIDDATA;
479	}
480
481	/* Check codec type */
482	if ((avctx->codec_id == AV_CODEC_ID_MSZH && avctx->extradata[7] != CODEC_MSZH) ||
483	(avctx->codec_id == AV_CODEC_ID_ZLIB && avctx->extradata[7] != CODEC_ZLIB)) {
484	av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
485	}
486
487	/* Detect image type */
488	switch (c->imgtype = avctx->extradata[4]) {
489	case IMGTYPE_YUV111:
490	c->decomp_size = basesize * 3;
491	max_decomp_size = max_basesize * 3;
492	avctx->pix_fmt = AV_PIX_FMT_YUV444P;
493	av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n");
494	break;
495	case IMGTYPE_YUV422:
496	c->decomp_size = basesize * 2;
497	max_decomp_size = max_basesize * 2;
498	avctx->pix_fmt = AV_PIX_FMT_YUV422P;
499	av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n");
500	if (avctx->width % 4) {
501	avpriv_request_sample(avctx, "Unsupported dimensions");
502	return AVERROR_INVALIDDATA;
503	}
504	break;
505	case IMGTYPE_RGB24:
506	c->decomp_size = basesize * 3;
507	max_decomp_size = max_basesize * 3;
508	avctx->pix_fmt = AV_PIX_FMT_BGR24;
509	av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n");
510	break;
511	case IMGTYPE_YUV411:
512	c->decomp_size = basesize / 2 * 3;
513	max_decomp_size = max_basesize / 2 * 3;
514	avctx->pix_fmt = AV_PIX_FMT_YUV411P;
515	av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n");
516	break;
517	case IMGTYPE_YUV211:
518	c->decomp_size = basesize * 2;
519	max_decomp_size = max_basesize * 2;
520	avctx->pix_fmt = AV_PIX_FMT_YUV422P;
521	av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n");
522	break;
523	case IMGTYPE_YUV420:
524	c->decomp_size = basesize / 2 * 3;
525	max_decomp_size = max_basesize / 2 * 3;
526	avctx->pix_fmt = AV_PIX_FMT_YUV420P;
527	av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:0.\n");
528	break;
529	default:
530	av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
531	return AVERROR_INVALIDDATA;
532	}
533
534	av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &subsample_h, &subsample_v);
535	if (avctx->width % (1<<subsample_h) || avctx->height % (1<<subsample_v)) {
536	avpriv_request_sample(avctx, "Unsupported dimensions");
537	return AVERROR_INVALIDDATA;
538	}
539
540	/* Detect compression method */
541	c->compression = (int8_t)avctx->extradata[5];
542	switch (avctx->codec_id) {
543	case AV_CODEC_ID_MSZH:
544	switch (c->compression) {
545	case COMP_MSZH:
546	av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n");
547	break;
548	case COMP_MSZH_NOCOMP:
549	c->decomp_size = 0;
550	av_log(avctx, AV_LOG_DEBUG, "No compression.\n");
551	break;
552	default:
553	av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
554	return AVERROR_INVALIDDATA;
555	}
556	break;
557	#if CONFIG_ZLIB_DECODER
558	case AV_CODEC_ID_ZLIB:
559	switch (c->compression) {
560	case COMP_ZLIB_HISPEED:
561	av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n");
562	break;
563	case COMP_ZLIB_HICOMP:
564	av_log(avctx, AV_LOG_DEBUG, "High compression.\n");
565	break;
566	case COMP_ZLIB_NORMAL:
567	av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n");
568	break;
569	default:
570	if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) {
571	av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
572	return AVERROR_INVALIDDATA;
573	}
574	av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression);
575	}
576	break;
577	#endif
578	default:
579	av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
580	return AVERROR_INVALIDDATA;
581	}
582
583	/* Allocate decompression buffer */
584	if (c->decomp_size) {
585	if (!(c->decomp_buf = av_malloc(max_decomp_size))) {
586	av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
587	return AVERROR(ENOMEM);
588	}
589	}
590
591	/* Detect flags */
592	c->flags = avctx->extradata[6];
593	if (c->flags & FLAG_MULTITHREAD)
594	av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n");
595	if (c->flags & FLAG_NULLFRAME)
596	av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n");
597	if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER))
598	av_log(avctx, AV_LOG_DEBUG, "PNG filter flag set.\n");
599	if (c->flags & FLAGMASK_UNUSED)
600	av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
601
602	/* If needed init zlib */
603	#if CONFIG_ZLIB_DECODER
604	if (avctx->codec_id == AV_CODEC_ID_ZLIB) {
605	int zret;
606	c->zstream.zalloc = Z_NULL;
607	c->zstream.zfree = Z_NULL;
608	c->zstream.opaque = Z_NULL;
609	zret = inflateInit(&c->zstream);
610	if (zret != Z_OK) {
611	av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
612	av_freep(&c->decomp_buf);
613	return AVERROR_UNKNOWN;
614	}
615	}
616	#endif
617
618	return 0;
619	}
620
621	static av_cold int decode_end(AVCodecContext *avctx)
622	{
623	LclDecContext * const c = avctx->priv_data;
624
625	av_freep(&c->decomp_buf);
626	#if CONFIG_ZLIB_DECODER
627	if (avctx->codec_id == AV_CODEC_ID_ZLIB)
628	inflateEnd(&c->zstream);
629	#endif
630
631	return 0;
632	}
633
634	#if CONFIG_MSZH_DECODER
635	AVCodec ff_mszh_decoder = {
636	.name = "mszh",
637	.long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
638	.type = AVMEDIA_TYPE_VIDEO,
639	.id = AV_CODEC_ID_MSZH,
640	.priv_data_size = sizeof(LclDecContext),
641	.init = decode_init,
642	.close = decode_end,
643	.decode = decode_frame,
644	.capabilities = AV_CODEC_CAP_DR1,
645	.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
646	};
647	#endif
648
649	#if CONFIG_ZLIB_DECODER
650	AVCodec ff_zlib_decoder = {
651	.name = "zlib",
652	.long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
653	.type = AVMEDIA_TYPE_VIDEO,
654	.id = AV_CODEC_ID_ZLIB,
655	.priv_data_size = sizeof(LclDecContext),
656	.init = decode_init,
657	.close = decode_end,
658	.decode = decode_frame,
659	.capabilities = AV_CODEC_CAP_DR1,
660	.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
661	};
662	#endif
663