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1
/*
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 * LCL (LossLess Codec Library) Codec
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 * Copyright (c) 2002-2004 Roberto Togni
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 *
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 */
20

    
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/**
22
 * @file lcl.c
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 * LCL (LossLess Codec Library) Video Codec
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 * Decoder for MSZH and ZLIB codecs
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 * Experimental encoder for ZLIB RGB24
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 *
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 * Fourcc: MSZH, ZLIB
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 *
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 * Original Win32 dll:
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 * Ver2.23 By Kenji Oshima 2000.09.20
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 * avimszh.dll, avizlib.dll
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 *
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 * A description of the decoding algorithm can be found here:
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 *   http://www.pcisys.net/~melanson/codecs
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 *
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 * Supports: BGR24 (RGB 24bpp)
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 *
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 */
39

    
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#include <stdio.h>
41
#include <stdlib.h>
42

    
43
#include "common.h"
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#include "bitstream.h"
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#include "avcodec.h"
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#ifdef CONFIG_ZLIB
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#include <zlib.h>
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#endif
50

    
51

    
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#define BMPTYPE_YUV 1
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#define BMPTYPE_RGB 2
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#define IMGTYPE_YUV111 0
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#define IMGTYPE_YUV422 1
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#define IMGTYPE_RGB24 2
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#define IMGTYPE_YUV411 3
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#define IMGTYPE_YUV211 4
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#define IMGTYPE_YUV420 5
61

    
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#define COMP_MSZH 0
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#define COMP_MSZH_NOCOMP 1
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#define COMP_ZLIB_HISPEED 1
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#define COMP_ZLIB_HICOMP 9
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#define COMP_ZLIB_NORMAL -1
67

    
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#define FLAG_MULTITHREAD 1
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#define FLAG_NULLFRAME 2
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#define FLAG_PNGFILTER 4
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#define FLAGMASK_UNUSED 0xf8
72

    
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#define CODEC_MSZH 1
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#define CODEC_ZLIB 3
75

    
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#define FOURCC_MSZH mmioFOURCC('M','S','Z','H')
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#define FOURCC_ZLIB mmioFOURCC('Z','L','I','B')
78

    
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/*
80
 * Decoder context
81
 */
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typedef struct LclContext {
83

    
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        AVCodecContext *avctx;
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        AVFrame pic;
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    PutBitContext pb;
87

    
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    // Image type
89
    int imgtype;
90
    // Compression type
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    int compression;
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    // Flags
93
    int flags;
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    // Decompressed data size
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    unsigned int decomp_size;
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    // Decompression buffer
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    unsigned char* decomp_buf;
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    // Maximum compressed data size
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    unsigned int max_comp_size;
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    // Compression buffer
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    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;
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    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