lcl.c@ 5776

Last change on this file since 5776 was 5776, checked in by vboxsync, 17 years ago
ffmpeg: exported to OSE
File size: 31.2 KB

Line
1	/*
2	* LCL (LossLess Codec Library) Codec
3	* Copyright (c) 2002-2004 Roberto Togni
4	*
5	* This library is free software; you can redistribute it and/or
6	* modify it under the terms of the GNU Lesser General Public
7	* License as published by the Free Software Foundation; either
8	* version 2 of the License, or (at your option) any later version.
9	*
10	* This library is distributed in the hope that it will be useful,
11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13	* Lesser General Public License for more details.
14	*
15	* You should have received a copy of the GNU Lesser General Public
16	* License along with this library; if not, write to the Free Software
17	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18	*
19	*/
20
21	/**
22	* @file lcl.c
23	* LCL (LossLess Codec Library) Video Codec
24	* Decoder for MSZH and ZLIB codecs
25	* Experimental encoder for ZLIB RGB24
26	*
27	* Fourcc: MSZH, ZLIB
28	*
29	* Original Win32 dll:
30	* Ver2.23 By Kenji Oshima 2000.09.20
31	* avimszh.dll, avizlib.dll
32	*
33	* A description of the decoding algorithm can be found here:
34	* http://www.pcisys.net/~melanson/codecs
35	*
36	* Supports: BGR24 (RGB 24bpp)
37	*
38	*/
39
40	#include <stdio.h>
41	#include <stdlib.h>
42
43	#include "common.h"
44	#include "bitstream.h"
45	#include "avcodec.h"
46
47	#ifdef CONFIG_ZLIB
48	#include <zlib.h>
49	#endif
50
51
52	#define BMPTYPE_YUV 1
53	#define BMPTYPE_RGB 2
54
55	#define IMGTYPE_YUV111 0
56	#define IMGTYPE_YUV422 1
57	#define IMGTYPE_RGB24 2
58	#define IMGTYPE_YUV411 3
59	#define IMGTYPE_YUV211 4
60	#define IMGTYPE_YUV420 5
61
62	#define COMP_MSZH 0
63	#define COMP_MSZH_NOCOMP 1
64	#define COMP_ZLIB_HISPEED 1
65	#define COMP_ZLIB_HICOMP 9
66	#define COMP_ZLIB_NORMAL -1
67
68	#define FLAG_MULTITHREAD 1
69	#define FLAG_NULLFRAME 2
70	#define FLAG_PNGFILTER 4
71	#define FLAGMASK_UNUSED 0xf8
72
73	#define CODEC_MSZH 1
74	#define CODEC_ZLIB 3
75
76	#define FOURCC_MSZH mmioFOURCC('M','S','Z','H')
77	#define FOURCC_ZLIB mmioFOURCC('Z','L','I','B')
78
79	/*
80	* Decoder context
81	*/
82	typedef struct LclContext {
83
84	AVCodecContext *avctx;
85	AVFrame pic;
86	PutBitContext pb;
87
88	// Image type
89	int imgtype;
90	// Compression type
91	int compression;
92	// Flags
93	int flags;
94	// Decompressed data size
95	unsigned int decomp_size;
96	// Decompression buffer
97	unsigned char* decomp_buf;
98	// Maximum compressed data size
99	unsigned int max_comp_size;
100	// Compression buffer
101	unsigned char* comp_buf;
102	#ifdef CONFIG_ZLIB
103	z_stream zstream;
104	#endif
105	} LclContext;
106
107
108	/*
109	*
110	* Helper functions
111	*
112	*/
113	static inline unsigned char fix (int pix14)
114	{
115	int tmp;
116
117	tmp = (pix14 + 0x80000) >> 20;
118	if (tmp < 0)
119	return 0;
120	if (tmp > 255)
121	return 255;
122	return tmp;
123	}
124
125
126
127	static inline unsigned char get_b (unsigned char yq, signed char bq)
128	{
129	return fix((yq << 20) + bq * 1858076);
130	}
131
132
133
134	static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)
135	{
136	return fix((yq << 20) - bq * 360857 - rq * 748830);
137	}
138
139
140
141	static inline unsigned char get_r (unsigned char yq, signed char rq)
142	{
143	return fix((yq << 20) + rq * 1470103);
144	}
145
146
147
148	static unsigned int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
149	{
150	unsigned char *destptr_bak = destptr;
151	unsigned char *destptr_end = destptr + destsize;
152	unsigned char mask = 0;
153	unsigned char maskbit = 0;
154	unsigned int ofs, cnt;
155
156	while ((srclen > 0) && (destptr < destptr_end)) {
157	if (maskbit == 0) {
158	mask = *(srcptr++);
159	maskbit = 8;
160	srclen--;
161	continue;
162	}
163	if ((mask & (1 << (--maskbit))) == 0) {
164	if (destptr + 4 > destptr_end)
165	break;
166	(int)destptr = (int)srcptr;
167	srclen -= 4;
168	destptr += 4;
169	srcptr += 4;
170	} else {
171	ofs = *(srcptr++);
172	cnt = *(srcptr++);
173	ofs += cnt * 256;;
174	cnt = ((cnt >> 3) & 0x1f) + 1;
175	ofs &= 0x7ff;
176	srclen -= 2;
177	cnt *= 4;
178	if (destptr + cnt > destptr_end) {
179	cnt = destptr_end - destptr;
180	}
181	for (; cnt > 0; cnt--) {
182	(destptr) = (destptr - ofs);
183	destptr++;
184	}
185	}
186	}
187
188	return (destptr - destptr_bak);
189	}
190
191
192
193
194	/*
195	*
196	* Decode a frame
197	*
198	*/
199	static int decode_frame(AVCodecContext avctx, void data, int data_size, uint8_t buf, int buf_size)
200	{
201	LclContext * const c = (LclContext *)avctx->priv_data;
202	unsigned char encoded = (unsigned char )buf;
203	unsigned int pixel_ptr;
204	int row, col;
205	unsigned char *outptr;
206	unsigned int width = avctx->width; // Real image width
207	unsigned int height = avctx->height; // Real image height
208	unsigned int mszh_dlen;
209	unsigned char yq, y1q, uq, vq;
210	int uqvq;
211	unsigned int mthread_inlen, mthread_outlen;
212	#ifdef CONFIG_ZLIB
213	int zret; // Zlib return code
214	#endif
215	unsigned int len = buf_size;
216
217	if(c->pic.data[0])
218	avctx->release_buffer(avctx, &c->pic);
219
220	c->pic.reference = 0;
221	c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
222	if(avctx->get_buffer(avctx, &c->pic) < 0){
223	av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
224	return -1;
225	}
226
227	outptr = c->pic.data[0]; // Output image pointer
228
229	/* Decompress frame */
230	switch (avctx->codec_id) {
231	case CODEC_ID_MSZH:
232	switch (c->compression) {
233	case COMP_MSZH:
234	if (c->flags & FLAG_MULTITHREAD) {
235	mthread_inlen = ((unsigned int)encoded);
236	mthread_outlen = ((unsigned int)(encoded+4));
237	if (mthread_outlen > c->decomp_size) // this should not happen
238	mthread_outlen = c->decomp_size;
239	mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
240	if (mthread_outlen != mszh_dlen) {
241	av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
242	mthread_outlen, mszh_dlen);
243	return -1;
244	}
245	mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - mthread_inlen,
246	c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
247	if (mthread_outlen != mszh_dlen) {
248	av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
249	mthread_outlen, mszh_dlen);
250	return -1;
251	}
252	encoded = c->decomp_buf;
253	len = c->decomp_size;
254	} else {
255	mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
256	if (c->decomp_size != mszh_dlen) {
257	av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
258	c->decomp_size, mszh_dlen);
259	return -1;
260	}
261	encoded = c->decomp_buf;
262	len = mszh_dlen;
263	}
264	break;
265	case COMP_MSZH_NOCOMP:
266	break;
267	default:
268	av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
269	return -1;
270	}
271	break;
272	case CODEC_ID_ZLIB:
273	#ifdef CONFIG_ZLIB
274	/* Using the original dll with normal compression (-1) and RGB format
275	* gives a file with ZLIB fourcc, but frame is really uncompressed.
276	* To be sure that's true check also frame size */
277	if ((c->compression == COMP_ZLIB_NORMAL) && (c->imgtype == IMGTYPE_RGB24) &&
278	(len == width * height * 3))
279	break;
280	zret = inflateReset(&(c->zstream));
281	if (zret != Z_OK) {
282	av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
283	return -1;
284	}
285	if (c->flags & FLAG_MULTITHREAD) {
286	mthread_inlen = ((unsigned int)encoded);
287	mthread_outlen = ((unsigned int)(encoded+4));
288	if (mthread_outlen > c->decomp_size)
289	mthread_outlen = c->decomp_size;
290	c->zstream.next_in = encoded + 8;
291	c->zstream.avail_in = mthread_inlen;
292	c->zstream.next_out = c->decomp_buf;
293	c->zstream.avail_out = c->decomp_size;
294	zret = inflate(&(c->zstream), Z_FINISH);
295	if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
296	av_log(avctx, AV_LOG_ERROR, "Mthread1 inflate error: %d\n", zret);
297	return -1;
298	}
299	if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
300	av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%u != %lu)\n",
301	mthread_outlen, c->zstream.total_out);
302	return -1;
303	}
304	zret = inflateReset(&(c->zstream));
305	if (zret != Z_OK) {
306	av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);
307	return -1;
308	}
309	c->zstream.next_in = encoded + 8 + mthread_inlen;
310	c->zstream.avail_in = len - mthread_inlen;
311	c->zstream.next_out = c->decomp_buf + mthread_outlen;
312	c->zstream.avail_out = c->decomp_size - mthread_outlen;
313	zret = inflate(&(c->zstream), Z_FINISH);
314	if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
315	av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate error: %d\n", zret);
316	return -1;
317	}
318	if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
319	av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %lu)\n",
320	mthread_outlen, c->zstream.total_out);
321	return -1;
322	}
323	} else {
324	c->zstream.next_in = encoded;
325	c->zstream.avail_in = len;
326	c->zstream.next_out = c->decomp_buf;
327	c->zstream.avail_out = c->decomp_size;
328	zret = inflate(&(c->zstream), Z_FINISH);
329	if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
330	av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
331	return -1;
332	}
333	if (c->decomp_size != (unsigned int)(c->zstream.total_out)) {
334	av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
335	c->decomp_size, c->zstream.total_out);
336	return -1;
337	}
338	}
339	encoded = c->decomp_buf;
340	len = c->decomp_size;;
341	#else
342	av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
343	return -1;
344	#endif
345	break;
346	default:
347	av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
348	return -1;
349	}
350
351
352	/* Apply PNG filter */
353	if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) {
354	switch (c->imgtype) {
355	case IMGTYPE_YUV111:
356	case IMGTYPE_RGB24:
357	for (row = 0; row < height; row++) {
358	pixel_ptr = row * width * 3;
359	yq = encoded[pixel_ptr++];
360	uqvq = encoded[pixel_ptr++];
361	uqvq+=(encoded[pixel_ptr++] << 8);
362	for (col = 1; col < width; col++) {
363	encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
364	uqvq -= (encoded[pixel_ptr+1] \| (encoded[pixel_ptr+2]<<8));
365	encoded[pixel_ptr+1] = (uqvq) & 0xff;
366	encoded[pixel_ptr+2] = ((uqvq)>>8) & 0xff;
367	pixel_ptr += 3;
368	}
369	}
370	break;
371	case IMGTYPE_YUV422:
372	for (row = 0; row < height; row++) {
373	pixel_ptr = row * width * 2;
374	yq = uq = vq =0;
375	for (col = 0; col < width/4; col++) {
376	encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
377	encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
378	encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
379	encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
380	encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
381	encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
382	encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
383	encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
384	pixel_ptr += 8;
385	}
386	}
387	break;
388	case IMGTYPE_YUV411:
389	for (row = 0; row < height; row++) {
390	pixel_ptr = row * width / 2 * 3;
391	yq = uq = vq =0;
392	for (col = 0; col < width/4; col++) {
393	encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
394	encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
395	encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
396	encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
397	encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
398	encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
399	pixel_ptr += 6;
400	}
401	}
402	break;
403	case IMGTYPE_YUV211:
404	for (row = 0; row < height; row++) {
405	pixel_ptr = row * width * 2;
406	yq = uq = vq =0;
407	for (col = 0; col < width/2; col++) {
408	encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
409	encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
410	encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
411	encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
412	pixel_ptr += 4;
413	}
414	}
415	break;
416	case IMGTYPE_YUV420:
417	for (row = 0; row < height/2; row++) {
418	pixel_ptr = row * width * 3;
419	yq = y1q = uq = vq =0;
420	for (col = 0; col < width/2; col++) {
421	encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
422	encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
423	encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
424	encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
425	encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
426	encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
427	pixel_ptr += 6;
428	}
429	}
430	break;
431	default:
432	av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
433	return -1;
434	}
435	}
436
437	/* Convert colorspace */
438	switch (c->imgtype) {
439	case IMGTYPE_YUV111:
440	for (row = height - 1; row >= 0; row--) {
441	pixel_ptr = row * c->pic.linesize[0];
442	for (col = 0; col < width; col++) {
443	outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]);
444	outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]);
445	outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]);
446	encoded += 3;
447	}
448	}
449	break;
450	case IMGTYPE_YUV422:
451	for (row = height - 1; row >= 0; row--) {
452	pixel_ptr = row * c->pic.linesize[0];
453	for (col = 0; col < width/4; col++) {
454	outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
455	outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]);
456	outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]);
457	outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
458	outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]);
459	outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]);
460	outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]);
461	outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]);
462	outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]);
463	outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]);
464	outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]);
465	outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]);
466	encoded += 8;
467	}
468	}
469	break;
470	case IMGTYPE_RGB24:
471	for (row = height - 1; row >= 0; row--) {
472	pixel_ptr = row * c->pic.linesize[0];
473	for (col = 0; col < width; col++) {
474	outptr[pixel_ptr++] = encoded[0];
475	outptr[pixel_ptr++] = encoded[1];
476	outptr[pixel_ptr++] = encoded[2];
477	encoded += 3;
478	}
479	}
480	break;
481	case IMGTYPE_YUV411:
482	for (row = height - 1; row >= 0; row--) {
483	pixel_ptr = row * c->pic.linesize[0];
484	for (col = 0; col < width/4; col++) {
485	outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
486	outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]);
487	outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]);
488	outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
489	outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]);
490	outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]);
491	outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]);
492	outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]);
493	outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]);
494	outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]);
495	outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]);
496	outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]);
497	encoded += 6;
498	}
499	}
500	break;
501	case IMGTYPE_YUV211:
502	for (row = height - 1; row >= 0; row--) {
503	pixel_ptr = row * c->pic.linesize[0];
504	for (col = 0; col < width/2; col++) {
505	outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]);
506	outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]);
507	outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]);
508	outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]);
509	outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]);
510	outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]);
511	encoded += 4;
512	}
513	}
514	break;
515	case IMGTYPE_YUV420:
516	for (row = height / 2 - 1; row >= 0; row--) {
517	pixel_ptr = 2 * row * c->pic.linesize[0];
518	for (col = 0; col < width/2; col++) {
519	outptr[pixel_ptr] = get_b(encoded[0], encoded[4]);
520	outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]);
521	outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]);
522	outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]);
523	outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]);
524	outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]);
525	outptr[pixel_ptr-c->pic.linesize[0]] = get_b(encoded[2], encoded[4]);
526	outptr[pixel_ptr-c->pic.linesize[0]+1] = get_g(encoded[2], encoded[4], encoded[5]);
527	outptr[pixel_ptr-c->pic.linesize[0]+2] = get_r(encoded[2], encoded[5]);
528	outptr[pixel_ptr-c->pic.linesize[0]+3] = get_b(encoded[3], encoded[4]);
529	outptr[pixel_ptr-c->pic.linesize[0]+4] = get_g(encoded[3], encoded[4], encoded[5]);
530	outptr[pixel_ptr-c->pic.linesize[0]+5] = get_r(encoded[3], encoded[5]);
531	pixel_ptr += 6;
532	encoded += 6;
533	}
534	}
535	break;
536	default:
537	av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
538	return -1;
539	}
540
541	*data_size = sizeof(AVFrame);
542	(AVFrame)data = c->pic;
543
544	/* always report that the buffer was completely consumed */
545	return buf_size;
546	}
547
548
549
550	/*
551	*
552	* Encode a frame
553	*
554	*/
555	static int encode_frame(AVCodecContext avctx, unsigned char buf, int buf_size, void *data){
556	LclContext *c = avctx->priv_data;
557	AVFrame *pict = data;
558	AVFrame * const p = &c->pic;
559	int i;
560	int zret; // Zlib return code
561
562	#ifndef CONFIG_ZLIB
563	av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled in.\n");
564	return -1;
565	#else
566
567	init_put_bits(&c->pb, buf, buf_size);
568
569	p = pict;
570	p->pict_type= FF_I_TYPE;
571	p->key_frame= 1;
572
573	if(avctx->pix_fmt != PIX_FMT_BGR24){
574	av_log(avctx, AV_LOG_ERROR, "Format not supported!\n");
575	return -1;
576	}
577
578	zret = deflateReset(&(c->zstream));
579	if (zret != Z_OK) {
580	av_log(avctx, AV_LOG_ERROR, "Deflate reset error: %d\n", zret);
581	return -1;
582	}
583	c->zstream.next_out = c->comp_buf;
584	c->zstream.avail_out = c->max_comp_size;
585
586	for(i = avctx->height - 1; i >= 0; i--) {
587	c->zstream.next_in = p->data[0]+p->linesize[0]*i;
588	c->zstream.avail_in = avctx->width*3;
589	zret = deflate(&(c->zstream), Z_NO_FLUSH);
590	if (zret != Z_OK) {
591	av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
592	return -1;
593	}
594	}
595	zret = deflate(&(c->zstream), Z_FINISH);
596	if (zret != Z_STREAM_END) {
597	av_log(avctx, AV_LOG_ERROR, "Deflate error: %d\n", zret);
598	return -1;
599	}
600
601	for (i = 0; i < c->zstream.total_out; i++)
602	put_bits(&c->pb, 8, c->comp_buf[i]);
603	flush_put_bits(&c->pb);
604
605	return c->zstream.total_out;
606	#endif
607	}
608
609
610
611	/*
612	*
613	* Init lcl decoder
614	*
615	*/
616	static int decode_init(AVCodecContext *avctx)
617	{
618	LclContext * const c = (LclContext *)avctx->priv_data;
619	unsigned int basesize = avctx->width * avctx->height;
620	unsigned int max_basesize = ((avctx->width + 3) & ~3) * ((avctx->height + 3) & ~3);
621	unsigned int max_decomp_size;
622	int zret; // Zlib return code
623
624	c->avctx = avctx;
625	avctx->has_b_frames = 0;
626
627	c->pic.data[0] = NULL;
628
629	#ifdef CONFIG_ZLIB
630	// Needed if zlib unused or init aborted before inflateInit
631	memset(&(c->zstream), 0, sizeof(z_stream));
632	#endif
633
634	if (avctx->extradata_size < 8) {
635	av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
636	return 1;
637	}
638
639	if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
640	return 1;
641	}
642
643	/* Check codec type */
644	if (((avctx->codec_id == CODEC_ID_MSZH) && (((char )avctx->extradata + 7) != CODEC_MSZH)) \|\|
645	((avctx->codec_id == CODEC_ID_ZLIB) && (((char )avctx->extradata + 7) != CODEC_ZLIB))) {
646	av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
647	}
648
649	/* Detect image type */
650	switch (c->imgtype = ((char )avctx->extradata + 4)) {
651	case IMGTYPE_YUV111:
652	c->decomp_size = basesize * 3;
653	max_decomp_size = max_basesize * 3;
654	av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n");
655	break;
656	case IMGTYPE_YUV422:
657	c->decomp_size = basesize * 2;
658	max_decomp_size = max_basesize * 2;
659	av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n");
660	break;
661	case IMGTYPE_RGB24:
662	c->decomp_size = basesize * 3;
663	max_decomp_size = max_basesize * 3;
664	av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");
665	break;
666	case IMGTYPE_YUV411:
667	c->decomp_size = basesize / 2 * 3;
668	max_decomp_size = max_basesize / 2 * 3;
669	av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n");
670	break;
671	case IMGTYPE_YUV211:
672	c->decomp_size = basesize * 2;
673	max_decomp_size = max_basesize * 2;
674	av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n");
675	break;
676	case IMGTYPE_YUV420:
677	c->decomp_size = basesize / 2 * 3;
678	max_decomp_size = max_basesize / 2 * 3;
679	av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n");
680	break;
681	default:
682	av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
683	return 1;
684	}
685
686	/* Detect compression method */
687	c->compression = ((char )avctx->extradata + 5);
688	switch (avctx->codec_id) {
689	case CODEC_ID_MSZH:
690	switch (c->compression) {
691	case COMP_MSZH:
692	av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");
693	break;
694	case COMP_MSZH_NOCOMP:
695	c->decomp_size = 0;
696	av_log(avctx, AV_LOG_INFO, "No compression.\n");
697	break;
698	default:
699	av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
700	return 1;
701	}
702	break;
703	case CODEC_ID_ZLIB:
704	#ifdef CONFIG_ZLIB
705	switch (c->compression) {
706	case COMP_ZLIB_HISPEED:
707	av_log(avctx, AV_LOG_INFO, "High speed compression.\n");
708	break;
709	case COMP_ZLIB_HICOMP:
710	av_log(avctx, AV_LOG_INFO, "High compression.\n");
711	break;
712	case COMP_ZLIB_NORMAL:
713	av_log(avctx, AV_LOG_INFO, "Normal compression.\n");
714	break;
715	default:
716	if ((c->compression < Z_NO_COMPRESSION) \|\| (c->compression > Z_BEST_COMPRESSION)) {
717	av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
718	return 1;
719	}
720	av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression);
721	}
722	#else
723	av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
724	return 1;
725	#endif
726	break;
727	default:
728	av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
729	return 1;
730	}
731
732	/* Allocate decompression buffer */
733	if (c->decomp_size) {
734	if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
735	av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
736	return 1;
737	}
738	}
739
740	/* Detect flags */
741	c->flags = ((char )avctx->extradata + 6);
742	if (c->flags & FLAG_MULTITHREAD)
743	av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");
744	if (c->flags & FLAG_NULLFRAME)
745	av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");
746	if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))
747	av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n");
748	if (c->flags & FLAGMASK_UNUSED)
749	av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
750
751	/* If needed init zlib */
752	if (avctx->codec_id == CODEC_ID_ZLIB) {
753	#ifdef CONFIG_ZLIB
754	c->zstream.zalloc = Z_NULL;
755	c->zstream.zfree = Z_NULL;
756	c->zstream.opaque = Z_NULL;
757	zret = inflateInit(&(c->zstream));
758	if (zret != Z_OK) {
759	av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
760	return 1;
761	}
762	#else
763	av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
764	return 1;
765	#endif
766	}
767
768	avctx->pix_fmt = PIX_FMT_BGR24;
769
770	return 0;
771	}
772
773
774
775	/*
776	*
777	* Init lcl encoder
778	*
779	*/
780	static int encode_init(AVCodecContext *avctx)
781	{
782	LclContext *c = avctx->priv_data;
783	int zret; // Zlib return code
784
785	#ifndef CONFIG_ZLIB
786	av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
787	return 1;
788	#else
789
790	c->avctx= avctx;
791
792	assert(avctx->width && avctx->height);
793
794	avctx->extradata= av_mallocz(8);
795	avctx->coded_frame= &c->pic;
796
797	// Will be user settable someday
798	c->compression = 6;
799	c->flags = 0;
800
801	switch(avctx->pix_fmt){
802	case PIX_FMT_BGR24:
803	c->imgtype = IMGTYPE_RGB24;
804	c->decomp_size = avctx->width * avctx->height * 3;
805	avctx->bits_per_sample= 24;
806	break;
807	default:
808	av_log(avctx, AV_LOG_ERROR, "Format %d not supported\n", avctx->pix_fmt);
809	return -1;
810	}
811
812	((uint8_t*)avctx->extradata)[0]= 4;
813	((uint8_t*)avctx->extradata)[1]= 0;
814	((uint8_t*)avctx->extradata)[2]= 0;
815	((uint8_t*)avctx->extradata)[3]= 0;
816	((uint8_t*)avctx->extradata)[4]= c->imgtype;
817	((uint8_t*)avctx->extradata)[5]= c->compression;
818	((uint8_t*)avctx->extradata)[6]= c->flags;
819	((uint8_t*)avctx->extradata)[7]= CODEC_ZLIB;
820	c->avctx->extradata_size= 8;
821
822	c->zstream.zalloc = Z_NULL;
823	c->zstream.zfree = Z_NULL;
824	c->zstream.opaque = Z_NULL;
825	zret = deflateInit(&(c->zstream), c->compression);
826	if (zret != Z_OK) {
827	av_log(avctx, AV_LOG_ERROR, "Deflate init error: %d\n", zret);
828	return 1;
829	}
830
831	/* Conservative upper bound taken from zlib v1.2.1 source */
832	c->max_comp_size = c->decomp_size + ((c->decomp_size + 7) >> 3) +
833	((c->decomp_size + 63) >> 6) + 11;
834	if ((c->comp_buf = av_malloc(c->max_comp_size)) == NULL) {
835	av_log(avctx, AV_LOG_ERROR, "Can't allocate compression buffer.\n");
836	return 1;
837	}
838
839	return 0;
840	#endif
841	}
842
843
844
845
846
847	/*
848	*
849	* Uninit lcl decoder
850	*
851	*/
852	static int decode_end(AVCodecContext *avctx)
853	{
854	LclContext * const c = (LclContext *)avctx->priv_data;
855
856	if (c->pic.data[0])
857	avctx->release_buffer(avctx, &c->pic);
858	#ifdef CONFIG_ZLIB
859	inflateEnd(&(c->zstream));
860	#endif
861
862	return 0;
863	}
864
865
866
867	/*
868	*
869	* Uninit lcl encoder
870	*
871	*/
872	static int encode_end(AVCodecContext *avctx)
873	{
874	LclContext *c = avctx->priv_data;
875
876	av_freep(&avctx->extradata);
877	av_freep(&c->comp_buf);
878	#ifdef CONFIG_ZLIB
879	deflateEnd(&(c->zstream));
880	#endif
881
882	return 0;
883	}
884
885	AVCodec mszh_decoder = {
886	"mszh",
887	CODEC_TYPE_VIDEO,
888	CODEC_ID_MSZH,
889	sizeof(LclContext),
890	decode_init,
891	NULL,
892	decode_end,
893	decode_frame,
894	CODEC_CAP_DR1,
895	};
896
897
898	AVCodec zlib_decoder = {
899	"zlib",
900	CODEC_TYPE_VIDEO,
901	CODEC_ID_ZLIB,
902	sizeof(LclContext),
903	decode_init,
904	NULL,
905	decode_end,
906	decode_frame,
907	CODEC_CAP_DR1,
908	};
909
910	#ifdef CONFIG_ENCODERS
911
912	AVCodec zlib_encoder = {
913	"zlib",
914	CODEC_TYPE_VIDEO,
915	CODEC_ID_ZLIB,
916	sizeof(LclContext),
917	encode_init,
918	encode_frame,
919	encode_end,
920	};
921
922	#endif //CONFIG_ENCODERS

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source: vbox/trunk/src/libs/ffmpeg-20060710/libavcodec/lcl.c@ 5776

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