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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 file is part of FFmpeg.
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 *
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 * FFmpeg 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 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg 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 FFmpeg; 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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/**
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 * @file lcldec.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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 */
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#include <stdio.h>
42
#include <stdlib.h>
43

    
44
#include "avcodec.h"
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#include "bitstream.h"
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#include "lcl.h"
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#if CONFIG_ZLIB
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#include <zlib.h>
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#endif
51

    
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/*
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 * Decoder context
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 */
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typedef struct LclDecContext {
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    AVFrame pic;
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    // Image type
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    int imgtype;
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    // Compression type
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    int compression;
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    // Flags
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    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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#if CONFIG_ZLIB
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    z_stream zstream;
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#endif
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} LclDecContext;
72

    
73

    
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/*
75
 *
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 * Helper functions
77
 *
78
 */
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static inline unsigned char fix (int pix14)
80
{
81
    int tmp;
82

    
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    tmp = (pix14 + 0x80000) >> 20;
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    if (tmp < 0)
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        return 0;
86
    if (tmp > 255)
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        return 255;
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    return tmp;
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}
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91

    
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static inline unsigned char get_b (unsigned char yq, signed char bq)
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{
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    return fix((yq << 20) + bq * 1858076);
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}
97

    
98

    
99

    
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static inline unsigned char get_g (unsigned char yq, signed char bq, signed char rq)
101
{
102
    return fix((yq << 20) - bq * 360857 - rq * 748830);
103
}
104

    
105

    
106

    
107
static inline unsigned char get_r (unsigned char yq, signed char rq)
108
{
109
    return fix((yq << 20) + rq * 1470103);
110
}
111

    
112

    
113

    
114
static unsigned int mszh_decomp(unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
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{
116
    unsigned char *destptr_bak = destptr;
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    unsigned char *destptr_end = destptr + destsize;
118
    unsigned char mask = 0;
119
    unsigned char maskbit = 0;
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    unsigned int ofs, cnt;
121

    
122
    while ((srclen > 0) && (destptr < destptr_end)) {
123
        if (maskbit == 0) {
124
            mask = *(srcptr++);
125
            maskbit = 8;
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            srclen--;
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            continue;
128
        }
129
        if ((mask & (1 << (--maskbit))) == 0) {
130
            if (destptr + 4 > destptr_end)
131
                break;
132
            *(int*)destptr = *(int*)srcptr;
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            srclen -= 4;
134
            destptr += 4;
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            srcptr += 4;
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        } else {
137
            ofs = *(srcptr++);
138
            cnt = *(srcptr++);
139
            ofs += cnt * 256;
140
            cnt = ((cnt >> 3) & 0x1f) + 1;
141
            ofs &= 0x7ff;
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            srclen -= 2;
143
            cnt *= 4;
144
            if (destptr + cnt > destptr_end) {
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                cnt =  destptr_end - destptr;
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            }
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            for (; cnt > 0; cnt--) {
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                *(destptr) = *(destptr - ofs);
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                destptr++;
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            }
151
        }
152
    }
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154
    return (destptr - destptr_bak);
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}
156

    
157

    
158

    
159
/*
160
 *
161
 * Decode a frame
162
 *
163
 */
164
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size)
165
{
166
    LclDecContext * const c = avctx->priv_data;
167
    unsigned char *encoded = (unsigned char *)buf;
168
    unsigned int pixel_ptr;
169
    int row, col;
170
    unsigned char *outptr;
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    unsigned int width = avctx->width; // Real image width
172
    unsigned int height = avctx->height; // Real image height
173
    unsigned int mszh_dlen;
174
    unsigned char yq, y1q, uq, vq;
175
    int uqvq;
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    unsigned int mthread_inlen, mthread_outlen;
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#if CONFIG_ZLIB
178
    int zret; // Zlib return code
179
#endif
180
    unsigned int len = buf_size;
181

    
182
    if(c->pic.data[0])
183
        avctx->release_buffer(avctx, &c->pic);
184

    
185
    c->pic.reference = 0;
186
    c->pic.buffer_hints = FF_BUFFER_HINTS_VALID;
187
    if(avctx->get_buffer(avctx, &c->pic) < 0){
188
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
189
        return -1;
190
    }
191

    
192
    outptr = c->pic.data[0]; // Output image pointer
193

    
194
    /* Decompress frame */
195
    switch (avctx->codec_id) {
196
    case CODEC_ID_MSZH:
197
        switch (c->compression) {
198
        case COMP_MSZH:
199
            if (c->flags & FLAG_MULTITHREAD) {
200
                mthread_inlen = *((unsigned int*)encoded);
201
                mthread_outlen = *((unsigned int*)(encoded+4));
202
                if (mthread_outlen > c->decomp_size) // this should not happen
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                    mthread_outlen = c->decomp_size;
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                mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
205
                if (mthread_outlen != mszh_dlen) {
206
                    av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
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                           mthread_outlen, mszh_dlen);
208
                    return -1;
209
                }
210
                mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - mthread_inlen,
211
                                        c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
212
                if (mthread_outlen != mszh_dlen) {
213
                    av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
214
                           mthread_outlen, mszh_dlen);
215
                    return -1;
216
                }
217
                encoded = c->decomp_buf;
218
                len = c->decomp_size;
219
            } else {
220
                mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size);
221
                if (c->decomp_size != mszh_dlen) {
222
                    av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
223
                           c->decomp_size, mszh_dlen);
224
                    return -1;
225
                }
226
                encoded = c->decomp_buf;
227
                len = mszh_dlen;
228
            }
229
            break;
230
        case COMP_MSZH_NOCOMP:
231
            break;
232
        default:
233
            av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
234
            return -1;
235
        }
236
        break;
237
    case CODEC_ID_ZLIB:
238
#if CONFIG_ZLIB
239
        /* Using the original dll with normal compression (-1) and RGB format
240
         * gives a file with ZLIB fourcc, but frame is really uncompressed.
241
         * To be sure that's true check also frame size */
242
        if ((c->compression == COMP_ZLIB_NORMAL) && (c->imgtype == IMGTYPE_RGB24) &&
243
            (len == width * height * 3))
244
            break;
245
        zret = inflateReset(&(c->zstream));
246
        if (zret != Z_OK) {
247
            av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
248
            return -1;
249
        }
250
        if (c->flags & FLAG_MULTITHREAD) {
251
            mthread_inlen = *((unsigned int*)encoded);
252
            mthread_outlen = *((unsigned int*)(encoded+4));
253
            if (mthread_outlen > c->decomp_size)
254
                mthread_outlen = c->decomp_size;
255
            c->zstream.next_in = encoded + 8;
256
            c->zstream.avail_in = mthread_inlen;
257
            c->zstream.next_out = c->decomp_buf;
258
            c->zstream.avail_out = c->decomp_size;
259
            zret = inflate(&(c->zstream), Z_FINISH);
260
            if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
261
                av_log(avctx, AV_LOG_ERROR, "Mthread1 inflate error: %d\n", zret);
262
                return -1;
263
            }
264
            if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
265
                av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%u != %lu)\n",
266
                       mthread_outlen, c->zstream.total_out);
267
                return -1;
268
            }
269
            zret = inflateReset(&(c->zstream));
270
            if (zret != Z_OK) {
271
                av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate reset error: %d\n", zret);
272
                return -1;
273
            }
274
            c->zstream.next_in = encoded + 8 + mthread_inlen;
275
            c->zstream.avail_in = len - mthread_inlen;
276
            c->zstream.next_out = c->decomp_buf + mthread_outlen;
277
            c->zstream.avail_out = c->decomp_size - mthread_outlen;
278
            zret = inflate(&(c->zstream), Z_FINISH);
279
            if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
280
                av_log(avctx, AV_LOG_ERROR, "Mthread2 inflate error: %d\n", zret);
281
                return -1;
282
            }
283
            if (mthread_outlen != (unsigned int)(c->zstream.total_out)) {
284
                av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %lu)\n",
285
                       mthread_outlen, c->zstream.total_out);
286
                return -1;
287
            }
288
        } else {
289
            c->zstream.next_in = encoded;
290
            c->zstream.avail_in = len;
291
            c->zstream.next_out = c->decomp_buf;
292
            c->zstream.avail_out = c->decomp_size;
293
            zret = inflate(&(c->zstream), Z_FINISH);
294
            if ((zret != Z_OK) && (zret != Z_STREAM_END)) {
295
                av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
296
                return -1;
297
            }
298
            if (c->decomp_size != (unsigned int)(c->zstream.total_out)) {
299
                av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
300
                       c->decomp_size, c->zstream.total_out);
301
                return -1;
302
            }
303
        }
304
        encoded = c->decomp_buf;
305
        len = c->decomp_size;
306
#else
307
        av_log(avctx, AV_LOG_ERROR, "BUG! Zlib support not compiled in frame decoder.\n");
308
        return -1;
309
#endif
310
        break;
311
    default:
312
        av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
313
        return -1;
314
    }
315

    
316

    
317
    /* Apply PNG filter */
318
    if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) {
319
        switch (c->imgtype) {
320
        case IMGTYPE_YUV111:
321
        case IMGTYPE_RGB24:
322
            for (row = 0; row < height; row++) {
323
                pixel_ptr = row * width * 3;
324
                yq = encoded[pixel_ptr++];
325
                uqvq = AV_RL16(encoded+pixel_ptr);
326
                pixel_ptr += 2;
327
                for (col = 1; col < width; col++) {
328
                    encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
329
                    uqvq -= AV_RL16(encoded+pixel_ptr+1);
330
                    AV_WL16(encoded+pixel_ptr+1, uqvq);
331
                    pixel_ptr += 3;
332
                }
333
            }
334
            break;
335
        case IMGTYPE_YUV422:
336
            for (row = 0; row < height; row++) {
337
                pixel_ptr = row * width * 2;
338
                yq = uq = vq =0;
339
                for (col = 0; col < width/4; col++) {
340
                    encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
341
                    encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
342
                    encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
343
                    encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
344
                    encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
345
                    encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
346
                    encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
347
                    encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
348
                    pixel_ptr += 8;
349
                }
350
            }
351
            break;
352
        case IMGTYPE_YUV411:
353
            for (row = 0; row < height; row++) {
354
                pixel_ptr = row * width / 2 * 3;
355
                yq = uq = vq =0;
356
                for (col = 0; col < width/4; col++) {
357
                    encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
358
                    encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
359
                    encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
360
                    encoded[pixel_ptr+3] = yq -= 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
        case IMGTYPE_YUV211:
368
            for (row = 0; row < height; row++) {
369
                pixel_ptr = row * width * 2;
370
                yq = uq = vq =0;
371
                for (col = 0; col < width/2; col++) {
372
                    encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
373
                    encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
374
                    encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
375
                    encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
376
                    pixel_ptr += 4;
377
                }
378
            }
379
            break;
380
        case IMGTYPE_YUV420:
381
            for (row = 0; row < height/2; row++) {
382
                pixel_ptr = row * width * 3;
383
                yq = y1q = uq = vq =0;
384
                for (col = 0; col < width/2; col++) {
385
                    encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
386
                    encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
387
                    encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
388
                    encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
389
                    encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
390
                    encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
391
                    pixel_ptr += 6;
392
                }
393
            }
394
            break;
395
        default:
396
            av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
397
            return -1;
398
        }
399
    }
400

    
401
    /* Convert colorspace */
402
    switch (c->imgtype) {
403
    case IMGTYPE_YUV111:
404
        for (row = height - 1; row >= 0; row--) {
405
            pixel_ptr = row * c->pic.linesize[0];
406
            for (col = 0; col < width; col++) {
407
                outptr[pixel_ptr++] = get_b(encoded[0], encoded[1]);
408
                outptr[pixel_ptr++] = get_g(encoded[0], encoded[1], encoded[2]);
409
                outptr[pixel_ptr++] = get_r(encoded[0], encoded[2]);
410
                encoded += 3;
411
            }
412
        }
413
        break;
414
    case IMGTYPE_YUV422:
415
        for (row = height - 1; row >= 0; row--) {
416
            pixel_ptr = row * c->pic.linesize[0];
417
            for (col = 0; col < width/4; col++) {
418
                outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
419
                outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[6]);
420
                outptr[pixel_ptr++] = get_r(encoded[0], encoded[6]);
421
                outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
422
                outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[6]);
423
                outptr[pixel_ptr++] = get_r(encoded[1], encoded[6]);
424
                outptr[pixel_ptr++] = get_b(encoded[2], encoded[5]);
425
                outptr[pixel_ptr++] = get_g(encoded[2], encoded[5], encoded[7]);
426
                outptr[pixel_ptr++] = get_r(encoded[2], encoded[7]);
427
                outptr[pixel_ptr++] = get_b(encoded[3], encoded[5]);
428
                outptr[pixel_ptr++] = get_g(encoded[3], encoded[5], encoded[7]);
429
                outptr[pixel_ptr++] = get_r(encoded[3], encoded[7]);
430
                encoded += 8;
431
            }
432
        }
433
        break;
434
    case IMGTYPE_RGB24:
435
        for (row = height - 1; row >= 0; row--) {
436
            pixel_ptr = row * c->pic.linesize[0];
437
            for (col = 0; col < width; col++) {
438
                outptr[pixel_ptr++] = encoded[0];
439
                outptr[pixel_ptr++] = encoded[1];
440
                outptr[pixel_ptr++] = encoded[2];
441
                encoded += 3;
442
            }
443
        }
444
        break;
445
    case IMGTYPE_YUV411:
446
        for (row = height - 1; row >= 0; row--) {
447
            pixel_ptr = row * c->pic.linesize[0];
448
            for (col = 0; col < width/4; col++) {
449
                outptr[pixel_ptr++] = get_b(encoded[0], encoded[4]);
450
                outptr[pixel_ptr++] = get_g(encoded[0], encoded[4], encoded[5]);
451
                outptr[pixel_ptr++] = get_r(encoded[0], encoded[5]);
452
                outptr[pixel_ptr++] = get_b(encoded[1], encoded[4]);
453
                outptr[pixel_ptr++] = get_g(encoded[1], encoded[4], encoded[5]);
454
                outptr[pixel_ptr++] = get_r(encoded[1], encoded[5]);
455
                outptr[pixel_ptr++] = get_b(encoded[2], encoded[4]);
456
                outptr[pixel_ptr++] = get_g(encoded[2], encoded[4], encoded[5]);
457
                outptr[pixel_ptr++] = get_r(encoded[2], encoded[5]);
458
                outptr[pixel_ptr++] = get_b(encoded[3], encoded[4]);
459
                outptr[pixel_ptr++] = get_g(encoded[3], encoded[4], encoded[5]);
460
                outptr[pixel_ptr++] = get_r(encoded[3], encoded[5]);
461
                encoded += 6;
462
            }
463
        }
464
        break;
465
    case IMGTYPE_YUV211:
466
        for (row = height - 1; row >= 0; row--) {
467
            pixel_ptr = row * c->pic.linesize[0];
468
            for (col = 0; col < width/2; col++) {
469
                outptr[pixel_ptr++] = get_b(encoded[0], encoded[2]);
470
                outptr[pixel_ptr++] = get_g(encoded[0], encoded[2], encoded[3]);
471
                outptr[pixel_ptr++] = get_r(encoded[0], encoded[3]);
472
                outptr[pixel_ptr++] = get_b(encoded[1], encoded[2]);
473
                outptr[pixel_ptr++] = get_g(encoded[1], encoded[2], encoded[3]);
474
                outptr[pixel_ptr++] = get_r(encoded[1], encoded[3]);
475
                encoded += 4;
476
            }
477
        }
478
        break;
479
    case IMGTYPE_YUV420:
480
        for (row = height / 2 - 1; row >= 0; row--) {
481
            pixel_ptr = 2 * row * c->pic.linesize[0];
482
            for (col = 0; col < width/2; col++) {
483
                outptr[pixel_ptr] = get_b(encoded[0], encoded[4]);
484
                outptr[pixel_ptr+1] = get_g(encoded[0], encoded[4], encoded[5]);
485
                outptr[pixel_ptr+2] = get_r(encoded[0], encoded[5]);
486
                outptr[pixel_ptr+3] = get_b(encoded[1], encoded[4]);
487
                outptr[pixel_ptr+4] = get_g(encoded[1], encoded[4], encoded[5]);
488
                outptr[pixel_ptr+5] = get_r(encoded[1], encoded[5]);
489
                outptr[pixel_ptr-c->pic.linesize[0]] = get_b(encoded[2], encoded[4]);
490
                outptr[pixel_ptr-c->pic.linesize[0]+1] = get_g(encoded[2], encoded[4], encoded[5]);
491
                outptr[pixel_ptr-c->pic.linesize[0]+2] = get_r(encoded[2], encoded[5]);
492
                outptr[pixel_ptr-c->pic.linesize[0]+3] = get_b(encoded[3], encoded[4]);
493
                outptr[pixel_ptr-c->pic.linesize[0]+4] = get_g(encoded[3], encoded[4], encoded[5]);
494
                outptr[pixel_ptr-c->pic.linesize[0]+5] = get_r(encoded[3], encoded[5]);
495
                pixel_ptr += 6;
496
                encoded += 6;
497
            }
498
        }
499
        break;
500
    default:
501
        av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
502
        return -1;
503
    }
504

    
505
    *data_size = sizeof(AVFrame);
506
    *(AVFrame*)data = c->pic;
507

    
508
    /* always report that the buffer was completely consumed */
509
    return buf_size;
510
}
511

    
512
/*
513
 *
514
 * Init lcl decoder
515
 *
516
 */
517
static av_cold int decode_init(AVCodecContext *avctx)
518
{
519
    LclDecContext * const c = avctx->priv_data;
520
    unsigned int basesize = avctx->width * avctx->height;
521
    unsigned int max_basesize = ((avctx->width + 3) & ~3) * ((avctx->height + 3) & ~3);
522
    unsigned int max_decomp_size;
523
    int zret; // Zlib return code
524

    
525
    c->pic.data[0] = NULL;
526

    
527
#if CONFIG_ZLIB
528
    // Needed if zlib unused or init aborted before inflateInit
529
    memset(&(c->zstream), 0, sizeof(z_stream));
530
#endif
531

    
532
    if (avctx->extradata_size < 8) {
533
        av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
534
        return 1;
535
    }
536

    
537
    if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
538
        return 1;
539
    }
540

    
541
    /* Check codec type */
542
    if (((avctx->codec_id == CODEC_ID_MSZH)  && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) ||
543
        ((avctx->codec_id == CODEC_ID_ZLIB)  && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) {
544
        av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n");
545
    }
546

    
547
    /* Detect image type */
548
    switch (c->imgtype = *((char *)avctx->extradata + 4)) {
549
    case IMGTYPE_YUV111:
550
        c->decomp_size = basesize * 3;
551
        max_decomp_size = max_basesize * 3;
552
        av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n");
553
        break;
554
    case IMGTYPE_YUV422:
555
        c->decomp_size = basesize * 2;
556
        max_decomp_size = max_basesize * 2;
557
        av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n");
558
        break;
559
    case IMGTYPE_RGB24:
560
        c->decomp_size = basesize * 3;
561
        max_decomp_size = max_basesize * 3;
562
        av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n");
563
        break;
564
    case IMGTYPE_YUV411:
565
        c->decomp_size = basesize / 2 * 3;
566
        max_decomp_size = max_basesize / 2 * 3;
567
        av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n");
568
        break;
569
    case IMGTYPE_YUV211:
570
        c->decomp_size = basesize * 2;
571
        max_decomp_size = max_basesize * 2;
572
        av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n");
573
        break;
574
    case IMGTYPE_YUV420:
575
        c->decomp_size = basesize / 2 * 3;
576
        max_decomp_size = max_basesize / 2 * 3;
577
        av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n");
578
        break;
579
    default:
580
        av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype);
581
        return 1;
582
    }
583

    
584
    /* Detect compression method */
585
    c->compression = *((char *)avctx->extradata + 5);
586
    switch (avctx->codec_id) {
587
    case CODEC_ID_MSZH:
588
        switch (c->compression) {
589
        case COMP_MSZH:
590
            av_log(avctx, AV_LOG_INFO, "Compression enabled.\n");
591
            break;
592
        case COMP_MSZH_NOCOMP:
593
            c->decomp_size = 0;
594
            av_log(avctx, AV_LOG_INFO, "No compression.\n");
595
            break;
596
        default:
597
            av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression);
598
            return 1;
599
        }
600
        break;
601
    case CODEC_ID_ZLIB:
602
#if CONFIG_ZLIB
603
        switch (c->compression) {
604
        case COMP_ZLIB_HISPEED:
605
            av_log(avctx, AV_LOG_INFO, "High speed compression.\n");
606
            break;
607
        case COMP_ZLIB_HICOMP:
608
            av_log(avctx, AV_LOG_INFO, "High compression.\n");
609
            break;
610
        case COMP_ZLIB_NORMAL:
611
            av_log(avctx, AV_LOG_INFO, "Normal compression.\n");
612
            break;
613
        default:
614
            if ((c->compression < Z_NO_COMPRESSION) || (c->compression > Z_BEST_COMPRESSION)) {
615
                av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression);
616
                return 1;
617
            }
618
            av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression);
619
        }
620
#else
621
        av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
622
        return 1;
623
#endif
624
        break;
625
    default:
626
        av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n");
627
        return 1;
628
    }
629

    
630
    /* Allocate decompression buffer */
631
    if (c->decomp_size) {
632
        if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) {
633
            av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n");
634
            return 1;
635
        }
636
    }
637

    
638
    /* Detect flags */
639
    c->flags = *((char *)avctx->extradata + 6);
640
    if (c->flags & FLAG_MULTITHREAD)
641
        av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n");
642
    if (c->flags & FLAG_NULLFRAME)
643
        av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n");
644
    if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER))
645
        av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n");
646
    if (c->flags & FLAGMASK_UNUSED)
647
        av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags);
648

    
649
    /* If needed init zlib */
650
    if (avctx->codec_id == CODEC_ID_ZLIB) {
651
#if CONFIG_ZLIB
652
        c->zstream.zalloc = Z_NULL;
653
        c->zstream.zfree = Z_NULL;
654
        c->zstream.opaque = Z_NULL;
655
        zret = inflateInit(&(c->zstream));
656
        if (zret != Z_OK) {
657
            av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
658
            return 1;
659
        }
660
#else
661
        av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n");
662
        return 1;
663
#endif
664
    }
665

    
666
    avctx->pix_fmt = PIX_FMT_BGR24;
667

    
668
    return 0;
669
}
670

    
671
/*
672
 *
673
 * Uninit lcl decoder
674
 *
675
 */
676
static av_cold int decode_end(AVCodecContext *avctx)
677
{
678
    LclDecContext * const c = avctx->priv_data;
679

    
680
    if (c->pic.data[0])
681
        avctx->release_buffer(avctx, &c->pic);
682
#if CONFIG_ZLIB
683
    inflateEnd(&(c->zstream));
684
#endif
685

    
686
    return 0;
687
}
688

    
689
#if CONFIG_MSZH_DECODER
690
AVCodec mszh_decoder = {
691
    "mszh",
692
    CODEC_TYPE_VIDEO,
693
    CODEC_ID_MSZH,
694
    sizeof(LclDecContext),
695
    decode_init,
696
    NULL,
697
    decode_end,
698
    decode_frame,
699
    CODEC_CAP_DR1,
700
    .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
701
};
702
#endif
703

    
704
#if CONFIG_ZLIB_DECODER
705
AVCodec zlib_decoder = {
706
    "zlib",
707
    CODEC_TYPE_VIDEO,
708
    CODEC_ID_ZLIB,
709
    sizeof(LclDecContext),
710
    decode_init,
711
    NULL,
712
    decode_end,
713
    decode_frame,
714
    CODEC_CAP_DR1,
715
    .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
716
};
717
#endif